Types KCGG 122, 142, KCEG 112, 142, 152, 242 and KCEU 142, 242 Overcurrent ProtectionT&D Protection & Control Types KCGG 122, 142, KCEG 112, 142, 152, 242 and KCEU 142, 242 Overcurrent Protection Figure 1: Relay type KCEG Features • Compact multi-function numerical relay • Versions with integral directionality (KCEG and KCEU) • Versions with wattmetric protection (KCEU) • Serial communications • Comprehensive protection functions including: 3 stage overcurrent 3 stage earth fault restricted earth fault up to 9 IDMT curves including IEC, ANSI/IEEE thermal overload alarm and trip underfrequency undercurrent breaker failure undervoltage rectifier protection broken conductor detection 2 Introduction • Two setting groups • Extensive measurement facilities • Fault records for the last five faults • Integral disturbance recorder accessible from a remote PC • Integral event recorder accessible from a remote PC • Circuit breaker maintenance alarm • Phase segregated outputs The K Range of overcurrent relays provides comprehensive protection for phase and earth faults, together with measurements, communications, control and recording facilities. Within the range, the KCGG relays provide non-directional overcurrent and earth fault protection, while the KCEG and KCEU relays allow each stage of protection to be selectively directionalised. The relays in the range are designed to operate with a wide range of ac or dc auxiliary power supplies. If a secure supply is not available, the KCEG 242 and KCEU 242 models can be powered from either an auxiliary supply (ac or dc) or from the CT circuit. Thus in the event of auxiliary supply failure, tripping functions will remain operational. Features per model Selective directional phase elements Selective directional earth elements Sensitive earth fault with wattmetric element Rectifier protection curve Thermal protection Broken conductor detection Dedicated breaker fail protection Undervoltage Under frequency IEC/IEEE/ANSI curves Phased output contacts Cold load pick up CB maintenance Remote CB control Disturbance recorder Event recorder - last 50 records Fault recorder - last 5 full records Load shedding by level Single phase watts and vars Thermal ammeter Peak thermal demand Table 1: Relay models available KCGG KCGG KCEG 122 142 112 q KCEG 142 q q KCEG 152 q KCEG 242 q q KCEU 142 q q q KCEU 242 q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q1 q q1 q q q q q q q q q q q q q q q Note 1: IEC curves only Models Available KCGG 122 Single phase overcurrent and/or earth fault relay KCGG 142 Three phase overcurrent and earth fault relay KCGG 142 02 KCGG 142 relay with a reduced number of inputs and outputs. With 3 opto inputs and 4 output contacts, this relay is supplied preconfigured or with customer specified settings KCEG 112 Directional earth fault relay KCEG 142 Three phase directional overcurrent and directional earth fault relay KCEG 152 Three phase overcurrent and directional earth fault relay (external Vo connection) KCEG 242 Self powered three phase directional overcurrent and directional earth fault relay KCEU 142 Directional three phase overcurrent and directional sensitive earth fault with wattmetric element KCEU 242 Self powered three phase directional overcurrent and directional sensitive earth fault with wattmetric element 3 Application The KCGG, KCEG and KCEU overcurrent relays can be used in all applications where overcurrent protection is required, eg. radial and ring circuits, and single and parallel feeders. Furthermore, the integral starting elements can be used to provide non-cascade operation and busbar protection, with additional directional zone feeder protection available in KCEG and KCEU relays. Thermal and restricted earth fault protection is also provided for lines and transformers. KCGG and KCEG relays, when used with the rectifier IDMT curve, can provide full protection of silicon rectifiers. KCEU relays can be used to provide directional overcurrent and sensitive earth fault protection for insulated power systems or systems that are earthed through an arc-suppression coil. (For arc suppression earthed systems (Petersen Coil) see publication R6537.) Undervoltage and underfrequency protection will operate for changes in system conditions or can be used to provide other protection and control functions. Functions Phase fault protection Ith TC I> Figure 2 shows the characteristics of the three phase overcurrent elements (I>, I>> and I>>>), their respective time delays (t>, t>> and t>>>), the undercurrent element (I<), and the thermal overload element with its respective time constant setting (TC). For KCGG and KCEG relays the first phase element (I>/t>) in the relay has a choice of nine inverse and one definite time characteristic as shown in Figure 17. For KCEU relays, the first phase element has a choice of five curves (as per KCGG and KCEG less rectifier and ANSI/IEEE curves) and one definite time characteristic. The first element has a reset timer to assist faster clearance of intermittent recurrent faults. There are two other elements [(I>>/t>>) and (I>>>/ t>>>)] for each phase function, which can be selectively disabled if not required. Thermal overload protection Time t> I>> I< t >> I>>> t >>> Current Multiple IDMT curves or definite time operation for phase and earth fault low sets. Two independent high set stages with definite time operation for both phase and earth fault elements. Undercurrent element for breaker fail and the auto-resetting of flags. Figure 2: Overcurrent characteristic Directional elements (KCEG and KCEU) The thermal overload element is a true I2 characteristic, with adjustable alarm and trip thresholds. The thermal state is stored in non-volatile memory. Earth fault protection Directional phase overcurrent elements are polarised by the quadrature phase-phase voltage. The phase directional elements are also provided with synchronous polarization which is maintained after the voltage collapses so that decisive operation is ensured. For KCEG 142/242 and KCEU relays, the polarizing voltage (–3Vo) is internally derived from the three phase voltages applied to the relay. In the case of the KCEG 112/152, the polarizing voltage must be externally derived from an open delta winding on the line voltage transformers or via a voltage transformer in the earth path. The earth fault elements are provided with the same range of time and current settings. Undercurrent elements and three phase loss of load The earth fault elements are designated (Io>/to>), (Io>>/to>>) and (Io>>>/to>>>), and their respective time delays are (to>, to>>, to>>>). The choice of characteristic curves for the first earth fault element is as described above for the phase fault protection. In addition to the above earth fault element the KCEU incorporates an additional wattmetric characteristic. Setting the wattmetric power threshold (Po) to zero disables this characteristic and the element reverts to the standard directional characteristic as described below. When set, the wattmetric power characteristic affects the directional control signal of all earth elements, Io>, Io>>, Io>>>, Io start. Two undercurrent elements are provided, one for phase faults (I<) and one for earth fault (Io<). The phase fault undercurrent element can be used for loss of load detection. 4 Circuit breaker failure and back-trip Underfrequency (KCGG and KCEG) Broken conductor detection This protection feature allows the relay to trip the upstream circuit breaker when a local breaker failure condition is detected and can be energised either from operation of the relay or an external trip. Figure 3 shows a typical back-trip method for a fault on Feeder 1 that should be cleared by Relay 2 and circuit breaker B (CB–B). If CB-B fails to clear the fault, it will be cleared by the back-trip contact of Relay 2 tripping CB–A. Undervoltage protection (KCEG and KCEU) A delayed underfrequency element is available which can be used to initiate direct load shed tripping. Busbar protection The relay can provide a broken conductor alarm when it detects load current in only two out of three conductors. Circuit breaker maintenance data Protection of busbars can also be achieved by using the start and blocking contacts of the K relays. If in Figure 3, relay 1 has a standard IDMT characteristic for I>, but a fast acting I>> element (time delay of typically 50ms) which is blocked by the downstream relays for feeder faults, an economical form of busbar protection can be applied to a system. This can be used where dedicated busbar protection can not be justified. Rectifier protection (KCGG and KCEG) An alarm is provided to indicate the need for circuit breaker maintenance based upon the number of circuit breaker operations or upon the summated contact breaking duty. The circuit breaker trip time is stored in the fault records. A separate characteristic can be set to provide an output for undervoltages which are phasephase, phase-neutral (KCEG only), three phase or single phase. An independently set timer, tV< is used with this function which can allow a voltage controlled overcurrent feature to be created by switching between different current settings in the two groups. The undervoltage element can be blocked when the circuit breaker is open. A special inverse time curve provides protection for silicon rectifiers. Where used with the thermal overload, instantaneous short circuit and restricted earth fault protection, both the transformer and rectifier can be fully protected. Incomer Relay 1 CB-A Back trip CB-B CB-C CB-D Relay 2 Relay 3 Relay 4 Feeder 1 Feeder 2 Feeder 3 Figure 3: Back trip fault clearance 5 Configuration Logic Ancillary Functions Measurements Event records The configuration of the relay, to meet the required applications, is accomplished in software. Setting logic function links, together with the assignment of inputs and outputs, define the way that the relay will operate. This allows: • Selection of features • Implementation of user defined logic using auxiliary timers • Control of the integral disturbance and event recorder These may be defined by the user via the relay front panel function keys, or remotely by a PC via the communications system. Alternative setting group The measurement values provided by the relay can be accessed by an integral back-lit liquid crystal display or via the serial port eliminating the need for additional instrumentation to be mounted on the panel. The measurements can be displayed in either primary or secondary values as selected by the user. The following quantities are provided as standard: • phase current • neutral current • frequency • thermal ammeter • peak demand ammeter Additional values are provided by the KCEG and KCEU, as follows: • phase-neutral voltage (KCEG only) • line voltage • residual voltage • watts (three phase, single phase for KCEG) • VArs (three phase, single phase for KCEG) • volt amps • power factor Fault records Fifty events are stored in a buffer. Software is available to enable the events to be downloaded to a PC. An event record is logged following a change of state of a control input or output relay, local setting change, or operation of a control function. Records are time tagged to a resolution of 1ms. Fault records and alarms are also stored as events. Disturbance records Two setting groups allow the user to assign settings for different operating conditions. Several methods of selecting the alternative setting group are provided. The internal disturbance recorder has up to 7 analogue, 16 digital and 1 time channel (depending on the model selected). The recorder can be triggered from any relay output and/or digital input, and can store one complete record. Data is sampled 8 times per cycle and each channel can store up to 512 samples. Software is available to allow records to be accessed and displayed by a PC. Test Features A number of features are provided to enable the relay to be thoroughly tested during commissioning, routine maintenance and fault finding operations: • Power-on diagnostics • Continuous self monitoring • The verification of input quantities by the measurement functions • The on/off states of the digital inputs and relay outputs can be displayed The last five faults are recorded by the relay. They include: • fault flags • currents • voltages (where measured) • circuit breaker operation time 6 Hardware Description KCGG, KCEG and KCEU relays are housed in Midos modular cases, suitable for either rack or panel mounting as shown in Figures 18, 19 and 20. The relays can have up to 4 CT and up to 3 VT analogue inputs. They provide 3 or 8 optically isolated inputs and 4 or 8 programmable outputs depending on the model selected, together with a dedicated watchdog relay. The front panel contains a 2 x 16 character alphanumeric back-lit liquid crystal display (LCD). The back-light is activated when the keypad is touched and will automatically switch off, conserving power, after 15 minutes of keypad inactivity. Four push-buttons provide local access to the relay’s menu. There are also 3 light emitting diodes (LED) for visual indication of the relay’s status, ie. relay healthy, trip, alarm. Standard Midos terminal blocks are located at the rear of the relay providing connections for all input and output circuits. Each terminal will accept up to two insulated crimp terminals using either; an ‘L’ shaped ring connector fastened with a 4mm diameter (M4) screw or; a snap-on connector compliant with BS5057 or equivalent. User Interface Front panel user interface The features of the relay can be accessed through a menu driven system. The menu is arranged in the form of a table, into each column of which, related items (menu cells) are grouped. The front panel LCD displays one menu cell at a time. The complete menu system can be traversed with the relay’s front cover in place by using the ‘F’ key. Easier access can be made with the cover off by using the ‘+’ and ‘–’ keys, which are also used to change the relay settings. Remote access user interface It should be noted that protection tripping and blocking signals are not routed via the K-Bus. Separate conventional cabling is used for this purpose; where appropriate the isolated 48V dc supply available on each relay is used to energise the opticallyisolated inputs. Communications protocol The communications protocol used with K Range relays is designated Courier. The Courier language has been developed specifically for the purpose of developing generic PC programs that will, without modification, communicate with any device using the Courier language. In the Courier system, all information resides within the relay. Each time communication is established with the relay, the requested information is loaded to the PC. The protocol includes extensive error checking routines to ensure the system remains reliable and secure. Password protection The menu table can also be accessed via the remote communications facility. This allows all of the menu cells in a column to be displayed simultaneously on the screen of a PC. Changes to a menu cell can be made from the PC keyboard. Serial communication The relays are interconnected via a shielded, twisted wire pair known as K-Bus. Up to 32 relays may be connected in parallel across the bus. The K-Bus is connected through a protocol converter known as KITZ, either directly or via a modem, to the RS232 port of the PC. The KITZ provides signals over the bus which are RS485 based and are transmitted at 64kbits/s. The K-Bus connection is shown in Figure 5. This system allows up to 32 relays to be accessed through one RS232 communications port. A pictorial representation of this is shown in Figure 4. Software is available with each KITZ to provide access to the relay to read and change settings. Additional software entitled ‘Protection Access Software & Toolkit’ is available. This provides access to the event recorder and other additional functions. Each relay is directly addressable over the bus to allow communication with any selected relay. Global commands may also be given to all relays on the network. 7 Password protection is provided on settings which alter the configuration of the relay, any accidental change to which could seriously affect the ability of the relay to perform its intended function, ie. enable/ disable settings, protection function characteristic selection, scheme logic settings and system VT and CT ratios. Relay 32 Relay 4 Relay 3 Relay 2 Relay 1 Protocol converter KITZ Figure 4: Basic communication system RS232 Desktop computer PC K-Bus Figure 5: Typical communications terminal arrangement K-Bus screened 2 core cable 8 L P2 S2 S1 P1 AC/DC supply Vx 13 14 21 22 23 24 25 26 27 28 WD 4 WD 6 3 5 30 RL0 32 34 RL1 36 38 RL2 40 42 RL3 44 1 Case earth connection 54 56 SCN 7 8 +48V field voltage K–Bus communications port AR initiate (to>/to>>/to>>>) (t>/t>>/t>>>) Trip (to>/to>>/to>>>/aux 1) (t>/t>>/t>>>) Start I> Start Io> Relay failed Relay healthy N KCGG 122 Case earth 1 3 5 7 9 13 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 51 53 55 SCN Module terminal blocks viewed from rear (with integral case earth strap) 9 Change setting group L0 30 32 34 36 38 40 42 44 46 48 50 52 54 56 Block t>>/to>> L1 Block t>>>/to>>> L2 Logic input common (1) 46 48 50 52 4 6 8 10 14 18 20 22 24 26 28 Notes: (1) (a) (b) (c) (d) CT shorting links make before (b) and (c) disconnect. Short terminals break before (c). Long terminal Pin terminal (pcb type). (2) CT connections are typical only. (3) Earth connections are typical only. Figure 6: Typical application diagram KCGG 122 A A B C C B Phase rotation P2 S2 S1 P1 AC/DC supply Vx 13 14 21 22 23 WD 4 WD 6 3 5 30 RL0 32 34 RL1 36 38 RL2 40 42 RL3 28 44 29 AR initiate (to>/to>>/to>>>) (t>/t>>/t>>>) Trip (to>/to>>/to>>>/aux 1) (t>/t>>/t>>>) thAlarm/CB alarm/CB fail Start I> Start Io> Relay failed Relay healthy Case earth 1 3 5 7 9 13 17 19 21 23 25 27 4 6 8 10 14 18 20 22 24 26 28 29 31 33 35 37 39 41 43 45 47 49 51 53 55 SCN 30 32 34 36 38 40 42 44 46 48 50 52 54 56 24 25 26 27 KCGG 142 Change setting group L0 Block t>>/to>> L1 Block t>>>/to>>> L2 Logic input common (1) 46 48 50 52 RL4 31 33 RL5 35 37 CB fail/backtrip 10 RL6 39 41 Control CB close RL7 45 47 49 51 53 55 Case earth connection 43 1 Control CB trip Module terminal blocks viewed from rear (with integral case earth strap) Notes: (1) (a) (b) (c) (d) CT shorting links make before (b) and (c) disconnect. Short terminals break before (c). Long terminal Pin terminal (pcb type). External trip L3 Initiate auxiliary timer 2 L4 Initiate auxiliary timer 3 L5 CB closed indication L6 CB open indication L7 Logic input common (2) 54 56 SCN 7 8 +48V field voltage K–Bus communications port (2) CT connections are typical only. (3) Earth connections are typical only. Figure 7: Typical application diagram KCGG 142 A S2 S1 WD 6 3 WD 5 30 22 23 RL0 32 34 RL1 36 38 RL2 40 42 RL3 28 44 AR initiate (to>/to>>/to>>>) (t>/t>>/t>>>) Trip (to>/to>>/to>>>/aux 1) (t>/t>>/t>>>) Start I> Start Io> 24 25 26 27 Relay failed Relay healthy AC/DC supply Vx 14 21 13 4 P2 P1 A B C C B Phase rotation Case earth 1 29 3 5 7 9 4 6 8 10 31 33 35 37 30 32 34 36 38 40 13 14 KCGG 14202 Change setting group L0 Block t>>/to>> L1 Block t>>>/to>>> L2 Logic input common (1) 52 1 Case earth connection 54 56 SCN 7 8 +48V field voltage K–Bus communications port 50 48 46 17 19 21 18 20 39 41 43 45 22 42 44 46 48 50 11 23 24 25 26 27 28 47 49 51 53 55 52 54 56 SCN Module terminal blocks viewed from rear (with integral case earth strap) Notes: (1) (a) CT shorting links make before (b) and (c) disconnect. (b) (c) Short terminals break before (c). Long terminal (d) Pin terminal (pcb type). (2) CT connections are typical only. (3) Earth connections are typical only. Figure 8: Typical application diagram KCGG 142 02 Direction of forward current flow A B A P2 S2 S1 P1 AC/DC supply Vx 13 14 21 22 23 24 25 26 27 28 19 20 4 WD 6 3 WD 5 30 RL0 32 34 RL1 36 38 RL2 40 42 RL3 44 1 Trip (to>/to>>/to>>>/aux 1) AR initiate (to>/to>>/to>>>) Start (Io>REV) Start (Io>FWD) Relay failed Relay healthy C A B C C B Phase rotation N dn da KCEG 112 Case earth connection 54 Case earth 12 1 3 5 7 9 13 17 19 21 23 25 27 4 6 8 10 14 18 20 22 24 26 28 29 31 33 35 37 39 41 43 45 47 49 51 53 55 SCN 30 32 34 36 38 40 42 44 46 48 50 52 54 56 46 Change setting group L0 Block to>> L1 Block to>>> L2 Logic input common (1) 48 50 52 56 SCN 7 8 +48V field voltage K–Bus communications port Notes: (1) (a) (b) (c) (d) CT shorting links make before (b) and (c) disconnect. Short terminals break before (c). Long terminal Pin terminal (pcb type). Module terminal blocks viewed from rear (with integral case earth strap) (2) CT connections are typical only. (3) Earth connections are typical only. Figure 9: Typical application diagram KCEG 112 Direction of forward current flow A A B C A C B Phase rotation N n a Case earth 1 3 5 7 9 13 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 51 53 55 SCN Module terminal blocks viewed from rear (with integral case earth strap) Notes: (1) (a) (b) (c) (d) CT shorting links make before (b) and (c) disconnect. Short terminals break before (c). Long terminal Pin terminal (pcb type). 30 32 34 36 38 40 42 44 46 48 50 52 54 56 b c 26 27 28 17 18 19 20 Change setting group L0 Block t>>/to>> L1 Block t>>>/to>>> L2 Logic input common (1) External trip L3 Initiate auxiliary timer 2 L4 Initiate auxiliary timer 3 L5 CB closed indication L6 CB open indication L7 Logic input common (2) 46 48 50 52 45 47 49 51 53 55 Case earth connection 54 56 SCN 7 8 +48V field voltage K–Bus communications port RL7 RL6 B C P2 S2 S1 P1 AC/DC supply Vx 13 14 21 WD 22 23 RL0 24 25 4 WD 6 3 5 30 32 34 RL1 36 38 RL2 40 42 RL3 44 29 RL4 31 33 RL5 35 37 39 41 43 1 Control CB trip Control CB close CB fail/backtrip Start (Io> REV/I> REV) AR initiate (to>/to>>/to>>>) (t>/t>>/t>>>) Trip (to>/to>>/to>>>/aux 1) (thTrip/t>/t>>/t>>>) thAlarm/CB alarm/CB fail Start (Io> FWD/I> FWD) Relay failed Relay healthy KCEG 142 4 6 8 10 14 18 20 22 24 26 28 13 (2) CT connections are typical only. (3) Earth connections are typical only. Figure 10: Typical application diagram KCEG 142 Direction of forward current flow A A B C A C B Phase rotation N dn Case earth 1 3 5 7 9 13 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 51 53 55 SCN Module terminal blocks viewed from rear (with integral case earth strap) Notes: (1) (a) (b) (c) (d) CT shorting links make before (b) and (c) disconnect. Short terminals break before (c). Long terminal Pin terminal (pcb type). 30 32 34 36 38 40 42 44 46 48 50 52 54 56 da 26 27 28 19 20 RL2 B C P2 S2 S1 P1 AC/DC supply Vx 13 14 21 22 23 24 25 WD 4 6 3 WD 5 30 RL0 32 34 RL1 36 38 40 42 RL3 44 29 RL4 31 33 AR initiate (to>/to>>/to>>>) (t>/t>>/t>>>) Trip (to>/to>>/to>>>/aux 1) (thTrip/t>/t>>/t>>>) thAlarm/CB alarm/CB fail Start (Io>REV) Start (Io>FWD) Relay failed Relay healthy 4 6 8 10 14 18 20 22 24 26 28 KCEG 152 Change setting group L0 Block t>>/to>> L1 Block t>>>/to>>> L2 Logic input common (1) External trip L3 Initiate auxiliary timer 3 L4 Initiate auxiliary timer 3 L5 CB closed indication L6 CB open indication L7 Logic input common (2) 46 48 50 52 45 47 49 RL5 35 37 CB fail/backtrip 14 RL6 39 41 Control CB close RL7 43 1 Case earth connection 54 56 Control CB trip K–Bus communications port 51 53 55 SCN 7 8 +48V field voltage (2) CT connections are typical only. (3) Earth connections are typical only. Figure 11: Typical application diagram KCEG 152 Direction of forward current flow A B C A A N C B Phase rotation a Case earth 1 3 5 7 9 13 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 51 53 55 SCN Module terminal blocks viewed from rear (with integral case earth strap) Notes: (1) (a) (b) (c) (d) CT shorting links make before (b) and (c) disconnect. Short terminals break before (c). Long terminal Pin terminal (pcb type). CB open indication L7 Logic input common (2) 30 32 34 36 38 40 42 44 46 48 50 52 54 56 b c n B C P2 S2 S1 Supply to trip coil P1 AC/DC supply Vx 13 14 9 10 21 22 23 24 25 26 27 28 17 18 19 20 Change setting group L0 Block t>>/to>> L1 Block t>>>/to>>> L2 Logic input common (1) External trip L3 47 Initiate auxiliary timer 3 L4 49 Initiate auxiliary timer 3 L5 CB closed indication L6 51 53 55 Series REG 4 WD 6 3 WD 5 30 RL0 32 34 RL1 36 38 RL2 40 42 RL3 44 29 RL4 31 33 RL5 35 37 RL6 39 41 RL7 43 1 Case earth connection Control CB trip Control CB close CB fail/backtrip AR initiate (to>/to>>/to>>>) (t>/t>>/t>>>) Trip (to>/to>>/to>>>/aux 1) (thTrip/t>/t>>/t>>>) thAlarm/CB alarm/CB fail Start (Io>REV/I>REV) Start (Io>FWD/I>FWD) Relay healthy Relay failed 4 6 8 10 14 18 20 22 24 26 28 KCEG 242 15 46 48 50 52 45 54 56 SCN 7 8 +48V field voltage K–Bus communications port (2) CT connections are typical only. (3) Earth connections are typical only. Figure 12: Typical application diagram KCEG 242 Direction of forward current flow A A B C C B Phase rotation A B C P2 P1 P2 S2 S1 P1 AC/DC supply Vx 13 14 21 WD N n 22 23 RL0 24 25 26 27 29 31 33 35 37 39 41 43 45 47 49 51 53 55 SCN Module terminal blocks viewed from rear (with integral case earth strap) Notes: (1) (a) (b) (c) (d) CT shorting links make before (b) and (c) disconnect. Short terminals break before (c). Long terminal Pin terminal (pcb type). 30 32 34 36 38 40 42 44 46 48 50 52 54 56 Change setting group L0 Block t>>/to>> L1 Block t>>>/to>>> L2 Logic input common (1) External trip L3 Initiate auxiliary timer 2 L4 Initiate auxiliary timer 3 L5 CB closed indication L6 CB open indication L7 Logic input common (2) 28 17 18 19 4 WD 6 3 5 30 32 34 RL1 36 38 RL2 40 42 RL3 44 29 RL4 31 33 RL5 35 37 RL6 20 RL7 46 48 50 52 45 56 47 49 51 53 55 7 8 +48V field voltage SCN 39 41 43 1 Control CB trip Control CB close CB fail/backtrip AR initiate (to>/to>>/to>>>) (t>/t>>/t>>>) Trip (to>/to>>/to>>>/aux 1) (thTrip/t>/t>>/t>>>) thAlarm/CB alarm/CB fail Start (Io> REV/I> REV) Start (Io> FWD/I> FWD) Relay failed Relay healthy a Case earth 1 3 5 7 9 13 17 19 21 23 25 27 b c 4 6 8 10 14 18 20 22 24 26 28 16 KCEU 142 Case earth connection 54 K–Bus communications port (2) CT connections are typical only. (3) Earth connections are typical only. Figure 13: Typical application diagram KCEU 142 Direction of forward current flow A B A C A B C P2 P1 P2 S2 S1 P1 AC/DC supply Vx Supply to trip coil 13 14 9 10 21 22 23 24 25 26 27 29 31 33 35 37 39 41 43 45 47 49 51 53 55 SCN Module terminal blocks viewed from rear (with integral case earth strap) Notes: (1) (a) (b) (c) (d) CT shorting links make before (b) and (c) disconnect. Short terminals break before (c). Long terminal Pin terminal (pcb type). 30 32 34 36 38 40 42 44 46 48 50 52 54 56 Change setting group L0 Block t>>/to>> L1 Block t>>>/to>>> L2 Logic input common (1) External trip L3 Initiate auxiliary timer 2 L4 Initiate auxiliary timer 3 L5 CB closed indication L6 CB open indication L7 Logic input common (2) 28 17 18 RL6 19 RL7 Series REG 4 WD 6 3 WD 5 30 RL0 32 34 RL1 36 38 a b c RL2 40 42 RL3 44 29 RL4 31 33 RL5 35 37 39 41 43 Control CB trip Control CB close CB fail/backtrip AR initiate (to>/to>>/to>>>) (t>/t>>/t>>>) Trip (to>/to>>/to>>>/aux 1) (thTrip/t>/t>>/t>>>) thAlarm/CB alarm/CB fail Start (Io> REV/I> REV) Start (Io> FWD/I> FWD) Relay failed Relay healthy C B Phase rotation N n Case earth 1 3 5 7 9 13 17 19 21 23 25 27 4 6 8 10 14 18 20 22 24 26 28 17 20 46 48 50 52 45 KCEU 242 Case earth connection 1 54 56 K–Bus communications port 47 49 51 53 55 SCN (2) CT connections are typical only. (3) Earth connections are typical only. 7 8 +48V field voltage Figure 14: Typical application diagram KCEU 242 Direction of forward current flow A A B C C B Phase rotation A B C P2 P1 P2 S2 S1 P1 AC/DC supply Vx 13 14 21 WD N dn 22 23 RL0 24 25 26 27 29 31 33 35 37 39 41 43 45 47 49 51 53 55 SCN Module terminal blocks viewed from rear (with integral case earth strap) Notes: (1) (a) (b) (c) (d) CT shorting links make before (b) and (c) disconnect. Short terminals break before (c). Long terminal Pin terminal (pcb type). 30 32 34 36 38 40 42 44 46 48 50 52 54 56 Change setting group L0 Block t>>/to>> L1 Block t>>>/to>>> L2 Logic input common (1) External trip L3 Initiate auxiliary timer 2 L4 Initiate auxiliary timer 3 L5 CB closed indication L6 CB open indication L7 Logic input common (2) 28 17 18 19 4 WD 6 3 5 30 32 34 RL1 36 38 RL2 40 42 RL3 44 29 RL4 31 33 RL5 35 37 RL6 20 RL7 46 48 50 52 45 56 47 49 51 53 55 7 8 +48V field voltage SCN 39 41 43 1 Control CB trip Control CB close CB fail/backtrip AR initiate (to>/to>>/to>>>) (t>/t>>/t>>>) Trip (to>/to>>/to>>>/aux 1) (thTrip/t>/t>>/t>>>) thAlarm/CB alarm/CB fail Start (Io> REV/I> REV) Start (Io> FWD/I> FWD) Relay failed Relay healthy da Case earth 1 3 5 7 9 13 17 19 21 23 25 27 4 6 8 10 14 18 20 22 24 26 28 18 KCEU 142 Case earth connection 54 K–Bus communications port (2) CT connections are typical only. (3) Earth connections are typical only. Figure 15: Typical application diagram KCEU 142 showing connection for broken delta VT winding Direction of forward current flow A B A C A B C P2 P1 P2 S2 S1 P1 AC/DC supply Vx Supply to trip coil 13 14 9 10 21 22 23 24 25 26 27 29 31 33 35 37 39 41 43 45 47 49 51 53 55 SCN Module terminal blocks viewed from rear (with integral case earth strap) Notes: (1) (a) (b) (c) (d) CT shorting links make before (b) and (c) disconnect. Short terminals break before (c). Long terminal Pin terminal (pcb type). 30 32 34 36 38 40 42 44 46 48 50 52 54 56 Change setting group L0 Block t>>/to>> L1 Block t>>>/to>>> L2 Logic input common (1) External trip L3 Initiate auxiliary timer 2 L4 Initiate auxiliary timer 3 L5 CB closed indication L6 CB open indication L7 Logic input common (2) 28 17 18 RL6 19 RL7 Series REG 4 WD 6 3 WD 5 30 RL0 32 34 RL1 36 38 da RL2 40 42 RL3 44 29 RL4 31 33 RL5 35 37 39 41 43 Control CB trip Control CB close CB fail/backtrip AR initiate (to>/to>>/to>>>) (t>/t>>/t>>>) Trip (to>/to>>/to>>>/aux 1) (thTrip/t>/t>>/t>>>) thAlarm/CB alarm/CB fail Start (Io> REV/I> REV) Start (Io> FWD/I> FWD) Relay failed Relay healthy C B Phase rotation N dn Case earth 1 3 5 7 9 13 17 19 21 23 25 27 4 6 8 10 14 18 20 22 24 26 28 19 20 46 48 50 52 45 KCEU 242 Case earth connection 1 54 56 K–Bus communications port 47 49 51 53 55 SCN (2) CT connections are typical only. (3) Earth connections are typical only. 7 8 +48V field voltage Figure 16: Typical application diagram KCEU 242 showing connection for broken delta VT winding IEC and special application curves 10000 ANSI/IEEE curves 10.000 Thermal curves 10000 Rectifier curve 1000 1000 1.000 100 100 Operating time (seconds) Operating time (seconds) 10 10 Time (x t) 0.100 No pre-fault load Pre-fault load at 50% thermal state MI LTI 30xDT 0.010 20 1 VI EI 0.1 1 10 Multiples of setting SI 30xDT Pre-fault load at 70% thermal state Pre-fault load at 90% thermal state 1 EI 10xDT VI 30xDT STI 30xDT 0.1 0.001 100 1 10 100 1 2 3 Current (xIth>) 4 5 6 Multiples of setting MI Moderately inverse VI Very inverse EI Extremely inverse LTI 30xDT SI 30xDT* EI 10xDT* VI 30xDT* STI 30xDT Long time inverse Standard inverse Extremely inverse Very inverse Shot time inverse *IEC standard characteristic All characteristics are definite time above 30x except extremely inverse and rectifier curve. Figure 17: IDMT and thermal curves Technical Data Ratings Inputs: Thermal withstand Transformer turns ratios • AC current inputs 3.2In continuous 30In for 3s 100In for 1s (maximum 400A) • AC voltage inputs 2 x Vn continuously 2.6Vn for 10s where Vn = 110V phase-phase Accuracy • Current transformers 1:1 to 9999:1 • Voltage transformers 1:1 to 9999:1 Current transformer requirements • AC current (In) 1A or 5A • AC voltage (Vn) 110V or 440V nominal phasephase (KCEG) 110V nominal phase-phase (KCEU) • Frequency 50/60Hz (50Hz for KCEU) • Auxiliary voltage (Vx) KCGG 122,142, KCEG112, 142,152 and KCEU 142 Nominal (V) Operative range (V) dc 24 – 125V or 48 – 250 dc ac • Operating times t>/to> IDTM except EI and rectifier ±5% plus 20 to 40ms EI and rectifier ±7.5% plus 20 to 40ms Definite time ±0.5% plus 20 to 40ms t>>/to>>/t>>>/to>>> Typically ±0.5% plus 20 to 40ms • Reset time t>/to> Voltage Current Power Typically ±1% ±50ms Typically ±2% Vn Typically ±2% In Typically ±4% Pn • Measurements 19 – 150 50 – 133 33 – 300 87 – 265 KCEG 242 and KCEU 242 only Nominal (V) Operative range (V) dc 100 – 250 Outputs: The following CT requirements shown in Table 1 are based on a maximum prospective fault current of 50In and the relay having a maximum high-set setting of 25In. The CT requirements are designed to provide operation of the phase and earth fault elements. When the criteria for a specific application are in excess of those detailed above or the actual resistance exceeds the limiting value quoted, the CT requirements may need to be increased. CT requirements for a variety of further applications are provided in publication R6096. Where the relays are being used for restricted earth fault protection the CTs must be of the correct size to assure stability as described in publication R6142. dc ac 60 – 300 60 – 265 Frequency Typically ±0.02Hz • Field voltage supply (for optically-isolated digital inputs) 48V dc (current limit: 60mA) • Capacitor discharge trip 50V dc, 680µF Burdens • AC current 0.02VA at In = 1A 0.03VA at In = 5A • AC voltage 0.02VA at 110V phase-phase • DC auxiliary voltage 4W to 12W* • AC auxiliary voltage 6VA to 23VA* • Optically-isolated inputs 0.25W per input *Note: Depending on the number of inputs and outputs energised. KCGG 122,142 and KCEG 112,142,152 and KCEU 142 Relay and CT secondary rating (A) 1 5 Nominal output (VA) 2.5 7.5 Accuracy class 10P 10P KCEG 242 and KCEU 242 1 5 7.5 10 10P 10P 15 20 0.7 0.06 Accuracy limit factor x rated current 20 20 Limiting lead resistance one way Ω 0.6 0.06 Table 1: Current transformer requirements 21 Core balance current transformer requirements for earth faults Overcurrent settings Phase fault Threshold (Is) KCGG 122,142 KCEG 112,142,152 KCEU 142 KCEG 242 KCEU 242 0.4 – 2.4In 0.4 – 32In 0.4 – 32In 0.02 – 3.2In Core balance CTs of metering class accuracy are required and should have a knee-point voltage satisfying the following formulae. (The value of current used for Ifn should be the maximum possible earth fault current that may flow). In addition, it should be ensured that the phase error of the applied CT is less than 90’ at 10% of rated current and less than 150’ at 1% of rated current. For the IDMT characteristic of the first element Io>: Vk > (Icn/2).(Rct + 2RL + Rrp + Rrn) I> I>> I>>> I< Earth fault 0.08 – 3.2In 0.08 – 32In 0.08 – 32In 0.02 – 3.2In Standard Special (on request) Sensitive ∆ Io> element Vk > (Ifn/2).(Rct + 2RL + Rrp + Rrn) KCGG 122, 142 KCEG 112, 142, 152, 242 KCEG 112, 152, KCEU 142, 242 0.001 – 0.16In* 0.001 – 1.6In* 0.001 – 1.6In* 0.0005 – 0.16In* Io>>/Io>>> element where: Vk = Required CT knee-point voltage secondary current for earth faults or 31 times Io> setting (whichever is lower) ∆ Io> Io>> Io>>> Io< 0.005 – 0.8In 0.005 – 8.0In 0.005 – 8.0In 0.005 – 0.8In 0.02 – 3.2In* 0.02 – 32In* 0.02 – 32In* 0.02 – 3.2In Icn = Maximum prospective Ifn = Maximum prospective secondary current for earth faults Rct = CT secondary winding resistance RL = Resistance of single lead from relay to current transformer Note: The sensitive settings are standard for KCEU 142, 242 and are available on request for KCEG 112, 152. *Notes: 1. For operation for earth faults below 0.2In with the KCEG 242 and KCEU 242, there must be sufficient load current to power the relay or alternatively, an auxiliary voltage supply. Directional settings (KCEG and KCEU) • Characteristic angle –180º to +180º in 1º steps • Zone of operation Characteristic angle ±90º (standard) ±85° (wattmetric) • Voltage polarising threshold (overcurrent directional elements) 110Vn: KCEG only 440Vn: 0.6V fixed 2.4V fixed Rrp = Impedance of relay phase current input Rrn = Impedance of relay neutral current input 2. The special settings may be required where limitations on the CT ratio result in a need for an unusually high earth fault setting. Otherwise the standard setting range should be chosen. Thermal alarm 0 – 110% of thermal state • Voltage polarising threshold Vop> (earth fault directional elements) 110Vn: KCEG only 440Vn: 0.6V to 80V in 0.2V steps 2.4V to 320V in 0.8V steps 0 to 20W in 50mW steps 0 to 100W in 250mW steps Ith> tc 0.08 – 3.2In 1 to 120 minutes • Wattmetric power threshold Po> In = 1A: KCEU only In = 5A: 22 • Undervoltage trip threshold V< 110Vn: KCEG only 440Vn: 1.0V to 220V in 1.0V steps 4.0V to 880V in 4.0V steps 0 to 220V 0 to 880V Contacts High voltage withstand • Output relays 4 (KCGG 122/KCEG 112) 8 (All other models) • Contact rating Make: 30A and carry for 0.2s Carry: 5A continuous Break: dc 50W resistive 25W inductive (L/R = 0.04s) ac 1250VA Subject to maxima of 5A and 300V. • Watchdog relays 1 make and 1 break Make: 10A and carry for 0.2s Carry: 5A continuous Break: dc 30W resistive 15W inductive (L/R = 0.04s) ac 1250VA Subject to maxima of 5A and 300V. • Durability Loaded contact 10,000 operations minimum Unloaded contact 100,000 operation minimum • Communications port (K-Bus) • Transmission mode Synchronous • Signal levels RS485 • Message format HDLC • Data rate 64 kbits/s • Connection Multidrop (32 units) • Cable type Screened twisted pair • Cable length 1000m • Connector Screw terminals or push-on connector to BS5057 • Isolation 2kV rms for 1 minute 23 • Dielectric withstand IEC 60255-5: 1977 2kV rms for 1 minute between all case terminals (except terminal 1) connected together and the case earth/terminal 1. 2kV rms for 1 minute between terminals of independent circuits including contact circuits. 1kV rms for 1 minute across the open contacts of the watchdog relays. ANSI/IEEE C37.90: 1989 1.5kV rms for 1 minute across open contacts of output relays. • High voltage impulse IEC 60255-5: 1977 Three positive and three negative impulses of 5kV peak, 1.2/50µs, 0.5J between all terminals of the same circuit (except output contacts), between independent circuits and between all terminals connected together (except terminal 1) and case earth terminal 1. Electrical environment • Undervoltage V< Vn = 110V: KCEG only Vn = 440V: • Underfrequency (KCGG and KCEG only) F< Reset 46 to 64Hz in 0.01Hz steps F< +0.05Hz Time settings (in graded steps) to>/t> (definite time) tRESET to>>/t>> to>>>/t>>> tV< tAUX 1 tAUX 2 tAUX 3 tBF tTRIP/tCLOSE IDMT curves Digital inputs 0 to 100s 0 to 60s 0 to 100s 0 to 10s 0 to 10s 0 to 2 x 106s (24 days) 0 to 2 x 106s (24 days) 0 to 2 x (24 days) 0 to 10s 0.5s to 5s See Figure 17. 106s • DC supply interruption IEC 60255-11: 1979 10ms interruption in the auxiliary supply, under normal operating conditions, without de-energising. • AC ripple on dc supply IEC 60255-11: 1979 The unit will withstand 12% ac ripple on the dc supply. • High frequency disturbance IEC 60255-22-1: 1988 Class III 2.5kV peak between independent circuits and case earth. 1.0kV peak across terminals of the same circuit (except metallic contacts). • Fast transient disturbance IEC 60255-22-4: 1992 Class IV 4kV, 2.5kHz applied directly to all inputs. 4kV, 2.5kHz applied directly to auxiliary voltage, watchdog and trip capacitor. 4kV, 2.5kHz via capacitor clamp to all inputs. • Optically-isolated inputs 3 (KCGG 122/KCEG 112) 8 (All other models) • Minimum operating voltage >35V dc • Maximum operating voltage 50V dc • Maximum ac induced loop voltage 50V rms (thermal limit) • Input resistance 10kΩ • Electrostatic discharge IEC 60255-22-2: 1996 Class 3 8kV discharge in air with cover in place. IEC 60255-22-2: 1996 Class 2 4kV contact discharge with cover removed. • EMC compliance 89/336/EEC Compliance to the European Commission Directive on EMC is claimed via the Technical Construction File route. EN 50081-2: 1994 EN 50082-2: 1995 Generic Standards were used to establish conformity. • Product safety 73/23/EEC Compliance with European Commission Low Voltage Directive. EN 61010-1: 1993/A2: 1995 EN 60950: 1992/A11: 1997 Compliance is demonstrated by reference to generic safety standards. Atmospheric environment Mechanical environment • Vibration IEC 60255-21-1: 1988 Response Class 1 Endurance Class 1 • Shock and bump IEC 60255-21-2: 1988 Shock response Class 1 Shock withstand Class 1 Bump Class 1 • Seismic IEC 60255-21-3: 1993 Class 2 • Surge withstand capability (SWC) C37.90.1: 1989 4kV fast transient applied directly to each input and earth. 2.5kV oscillatory applied directly to each input and earth. 4kV fast transient applied directly across each output contact, opto input and power supply circuit. 2.5kV oscillatory applied directly across each output contact, opto input and power supply circuit. IEEE radiated immunity C37.90.2: 1995 25 – 1000MHz, zero and 100% square wave modulated. Field strength 35V/m. • Temperature IEC 60068-2-1: 1990/A2: 1994 (cold) Storage and transit –25°C to +70°C Operating –25°C to +55°C IEC 60068-2-2: 1974/A2: 1994 (dry heat) • Humidity IEC 60068-2-3: 1969 56 days at 93% RH and +40°C • Enclosure protection IEC 60529: 1989 IP50 (dust protected) 24 Cases KCGG 122 KCGG 142 KCEG 112 KCEG 142 KCEG 152 KCEU 142 KCEG 242 KCEU 242 Midos size 4 Midos size 6 Midos size 8 Case outlines are shown in Figures 18, 19 and 20. 52 97 4 holes Ø 4.4 23.5 All dimensions in mm. 168 159 99 Panel cut-out: Flush mounting fixing details. 32 212 25 min. 177 157 max. 103 Flush mounting. 11 Figure 18: Case outlines size 4 149 4 holes Ø 4.4 103.6 23.5 All dimensions in mm. 168 159 151 Panel cut-out: Flush mounting fixing details. 32 212 25 min. 177 157 max. 155 Flush mounting. 11 Figure 19: Case outlines size 6 25 200 4 holes Ø 4.4 155.4 24 168 159 203 Panel cut-out: Flush mounting fixing details. All dimensions in mm. 32 212 25 min. 177 157 max. 206 Flush mounting. 11 Figure 20: Case outlines size 8 Additional information Service Manual CT Requirements for the Application of Midos Relays K Range Relay Schemes KITZ 101/102/103 KITZ 201 KITZ 204 Application Notes for KCGG High Impedance Protection Supplementary Application Guide for Sensitive Earth Fault Protection R8551 R6096 R6536 R6521 R6542 R6563 R6142 R6554 26 Information required with order Relay type: KCGG D 0 122 142 Configuration: Standard Customer settings 1 2 2 1 4 2 0 1 X X 0 2 X Y KCGG 142 only: Reduced input/output Reduced I/O with customer settings Case size: Size 4 MIDOS Flush Mounting Auxiliary voltage: 24/125V 48/250V Not used D 2 5 CT rating: 1A CT (0.005In to 0.8In for earth faults) standard 1A CT (0.02In to 3.2In for earth faults) special 5A CT (0.005In to 0.8In for earth faults) standard 5A CT (0.02In to 3.2In for earth faults) special Language: English French German Spanish Issue letter C D E F E F G S * Note: See ‘Overcurrent settings’, page 22. It will be assumed that the standard version will be required unless otherwise stated in the order. 27 Relay type: KCEG D 0 112 142 152 242 Configuration: Standard Customer settings 1 1 1 2 1 4 5 4 2 2 2 2 0 1 X X Case size: Size 4 MIDOS Flush Mounting (KCEG 112 only) Size 6 MIDOS Flush Mounting (KCEG 142/152 only) Size 8 MIDOS Flush Mounting (KCEG 242 only) Auxiliary voltage (Vx): 24/125V (except KCEG 242) 48/250V (except KCEG 242) 100/250V (KCEG 242 only) Operating voltage (Vn): 110V ac; 50 – 60Hz 440V ac; 50 – 60Hz D F H 2 5 9 1 4 CT rating: 1A CT (0.005In to 0.8In for earth faults) standard 1A CT (0.02In to 3.2In for earth faults) special 5A CT (0.005In to 0.8In for earth faults) standard 5A CT (0.02In to 3.2In for earth faults) special 1A CT (0.001In to 0.16In for earth faults) sensitive1 5A CT (0.001In to 0.16In for earth faults) sensitive1 5A CT phase; 1A CT earth (0.001In to 0.16In for earth faults) sensitive2 Language: English French German Spanish Issue letter 1 2 C D E F L M P E F G S KCEG 112 and KCEG 152 only KCEG 152 only * Notes: See ‘Overcurrent settings’, page 22. It will be assumed that the standard version will be required unless otherwise stated in the order. 28 Relay type: KCEU 4 2 D 0 Auxiliary powered Dual powered Configuration: Standard Customer settings 1 2 0 1 X X Case size: Size 6 MIDOS Flush Mounting (KCEU 142 only) Size 8 MIDOS Flush Mounting (KCEU 242 only) Auxiliary voltage : 24/125V (except KCEU 242) 48/250V (except KCEU 242) 100/250V (KCEU 242 only) Operating voltage (Vn): 110V ac; 50Hz F H 2 5 9 1 CT rating: 1A CT 5A CT 5A CT for phase; 1A CT for earth (KCEU 142 only) Language: English French German Spanish Issue letter L M P E F G S 29 Glossary Courier A communications language developed to provide generic control, monitoring, data extraction and setting changes on remote devices (primarily on protective relays) within the substation environment. The 64 kbit/s twisted pair cable used to connect Courier compatible devices and transfer Courier data. The interface unit which converts between K-Bus and IEC870 format data. 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