MidosType MCGG 22, 42, 52, 53, 62, 63 & 82 Overcurrent Relay for Phase and Earth Faults Features ● Choice of 4 inverse time curves and 3 definite time ranges by switched selection. ● Wide setting range of 0.05 x In to 2.4 x In in steps of 0.05 x In. ● Time multiplier range 0.05 to 1 on all seven characteristics. ● Separate led indicators provided on each measuring board to show time delayed and instantaneous operations. ● Led start indicators provided to facilitate testing. ● Separate output contacts provided for time delayed phase fault, instantaneous phase fault, time delayed earth fault and instantaneous earth fault operations. ● Low ac burden. ● Suitable for use with separate direction relay. ● Accurately follows time curves to BS142 and IEC255. ● High resetting ratio. ● Fast resetting time. ● Positive, calibrated settings by means of switches. ● Internal dc auxiliary power supply operating over a wide input range. ● Separate test mode with trip test feature. ● Indication of power to the measuring board. ● Non-volatile memory for time delayed and instantaneous led indicators. 2 Figure 1: Relay type MCGG 62 withdrawn from case. Models available MCGG 22 MCGG 62 Single phase overcurrent with instantaneous element. Three phase overcurrent with instantaneous elements. MCGG 42 MCGG 63 Two phase overcurrent with instantaneous elements. Three phase overcurrent (with polyphase measurement), with instantaneous element. MCGG 52 MCGG 82 Two phase overcurrent plus earth fault with instantaneous elements. Three phase overcurrent plus earth fault with instantaneous elements. MCGG 53 Associated publications: Two phase overcurrent (with polyphase measurement) plus earth fault with instantaneous elements. 3 Phase overcurrent † inst Model MCGG MCGG MCGG MCGG MCGG MCGG MCGG 22 42 52 53 62 63 82 2 Phase overcurrent † inst ● ● ● ● ● ● ● ● ● Midos System R6001 Directional Relay R6003 ● ● ● Single Phase or earthfault † inst ● ● ● ● ● ● ● ● Measuring boards Case size 1 2 3 2 3 1 4 4 6 8 8 6 6 8 Switch position (0) (1) ● ● ● ● ● ● An instantaneous element with low transient overreach is incorporated within each phase or earth fault measuring board. current and time multiplier settings. Trip test Standard inverse ● ● With all the current/time characteristics available on one relay. current measurement is inhibited. This can be easily disabled in applications where it is not required. whether performed on a single phase or polyphase input. generators and HV feeder circuits and the protection of neutral earthing resistors. For applications where the instantaneous earth fault element is required to have a sensitive setting whilst remaining stable on heavy through faults the use of a stabilising resistor is recommended. Application diagrams are provided in Figures 2 to 8 (inclusive) showing typical wiring configurations. alternatively.5 (I – 1) sec VI 80 – 1) sec EI 120 (I – 1) sec LT (I0. These boards. changes in system configuration can be readily accommodated.02 (I2 Definite time 2 seconds D2 Definite time 4 seconds D4 Definite time 8 seconds D8 ● ● ● ● ● ● Table1: Operating time characteristics with corresponding switch positions. Description This range of MCGG relays is designed so that versions are available with separate measuring boards for each phase or earth fault input. 3 . capable of circuit breaker tripping.14 – 1) sec SI 13. These are used to select the required time/current characteristic. The case incorporates one or two terminal blocks for external connections. Power to each measuring board may be tested whilst the relay is in service. During this test. For added security. but in some applications a non-linear resistor is required to limit this voltage. when the module is removed. Removal of the module automatically short circuits the current transformer connections by means of safety contacts within the case terminal block. are contained in Very inverse t= ● Extremely inverse t= ● ● Long time earth fault t= ● ● Non-standard resistance values and non-linear voltage limiting devices are available. Relay settings Separate setting switches for each measuring board are provided on the relay frontplate. are provided for time delayed phase faults. the ct circuits are short circuited before the connections to the output contacts and the dc supply are broken. together with the other circuits of the relay. instantaneous phase faults. Each measuring board has a built-in ‘power off’ memory feature for the time delayed and instantaneous led indicators. time delayed earth fault and instantaneous earth fault operations. Also. Table 1 gives the basic operating characteristic and the settings of the switches.Application The relay can be used in applications where time graded overcurrent and earth fault protection is required. is performed via an analogue-to-digital converter. t= ● ● The total impedance of the relay and the series stabilising resistor is usually low enough to prevent the current transformers developing voltages over 2kV during maximum internal faults. Operating characteristic ● ● ● 0. 6 or 8 Midos case. Separate output contacts. Other applications include back-up protection for transformers. The relay can be used to provide selective protection for overhead and underground distribution feeders. When required. The current transformers for this application must satisfy the criteria detailed under ‘Current transformer requirements’ in Technical Data. each measuring board utilising a microcomputer as a basic circuit element. a standard relay can be ordered before detailed co-ordination studies are carried out – a distinct advantage for complex systems. phase inputs may be combined on to one board for polyphase measurement (see table). The current measurement. without affecting the current measurement. Selection of time characteristics The current/time characteristic selection is carried out by means of three switches (identified by symbol on the nameplate). a single plug-in module which is supplied in a size 4. A test mode is also available to carry out a trip test on the output relays. The relay uses solid state techniques. directional control can be exercised over the relay by connecting an output contact from direction relay type METI to the terminals provided. This causes all three led to flash once per second. 3. Figure 3: Application diagram (10 MCGG 22 02): static modular overcurent relay type MCGG 22.2s steps Trip test Current measurement is inhibited by setting the curve selection switches to 111. normal current measurement is not inhibited. CT connections are typical only.4 to 8. Long terminals 2. Contacts must close to inhibit overcurrent relay. The range of adjustment of finite settings is from 1x to 31x in unity steps. Current setting Time delayed element The current setting control is marked Is = Σ x In where Is is the current setting in amps. 4 RL1–2 2 Phase fault time delayed trip output contacts 1 RL2–1 8 10 9 RL2–2 16 15 MCGG 22 Notes: 1. If the reset push button is then pressed for approximately six seconds.4 x In in steps of 0. or when the lowest switch is set to infinity regardless of the positions of the other five switches. Short terminals break before (c). whilst the relay is in service. This control is marked xt = Σ where Σ is the sum of all the switch positions.Time multiplier setting The time given by each of the operating characteristics must be multiplied by the time multiplier to give the actual operating time of the relay. When directional control is required the contacts of the directional relays should be connected as shown. Instantaneous element The range of multiplication is from 0.2 to 4. The setting control of the instantaneous element is marked Iinst = Σ x Is where Σ is the sum of the switch positions and Is is the time delayed element setting. indicating that there is power to the measuring boards. Time range s 0. When all switches are set to the left (at zero). Operating characteristics s 2 4 8 Power supply healthy test Each measuring board provides a setting range of 0.0 in 0.05x to 1.1 to 2.05 x In to 2.05 x In. Earthing connections (CTs) are typical only. S1 B C C Phase rotation Directional control PhA (See Note 4) TMS setting 24 Inst setting Curve selection 23 (See Note 2) 27 IA Is Indicator reset Time delayed trip Inst. the instantaneous feature is rendered inoperable. During this test. both output relays associated with that measuring board will operate.025.05s steps 0. A B S2 Figure 2: Type MCGG 22 nameplate A P1 P2 If. all the leds are iluminated. 4. Single phase with instantaneous element. (a) 7 6 Phase fault instantaneous trip output contacts .0x in steps of 0. The leds are reset on releasing the push button. Σ is the sum of all the switch positions and In is the relay rated current in amps. This acts as a conventional time multiplier on the current dependent characteristics and gives the following time ranges for the definite time characteristics. the reset button is pressed. trip µC PhA RL1–1 28 Input circuit Ph Current setting Ph I>Is 5 RL1 2 Case earth 1 2 5 6 7 8 9 10 13 14 15 16 Vx +VE –VE 13 14 26 Output circuits Ph Power supply circuits RL2 2 Case earth connection 23 24 26 27 (See Note 3) 28 Module terminal block viewed from rear (b) (c) CT shorting links make before (b) and (c) disconnect.0 in 0.1s steps 0.0 in 0. Figure 5: Application diagram (10 MCGG 52 03): static modular overcurent relay type MCGG 52. Long terminals (b) (c) 41 42 Current setting Ph Case earth connection Module terminal block viewed from rear (with integral case earth strap) 36 Power supply circuits 14 (See Note 3) Notes: 1. 4. trip 25 1 29 Phase fault time delayed trip output contacts 30 24 46 Case earth 35 3. 3.A P2 A P1 S2 B S1 Directional control PhA C C B Phase rotation (See Note 4) TMS setting Inst setting Indicator reset Curve selection 49 50 (See Note 2) 21 IA Is RL1 2 Time delayed trip Inst. Short terminals break before (c). 4. trip 26 +VE 29 30 TMS setting 46 Case earth 35 33 RL2 2 24 Directional control PhC RL1–1 Output circuits Ph 22 2. (a) (b) (c) –VE 7 5 13 14 17 Power supply circuits Input circuit RL3–2 Output circuits I>Is RL4–1 RL4 2 Earth fault time delayed trip output contacts 8 10 9 16 Earth fault instantaneous trip output contacts 15 MCGG 52 2. Contacts must close to inhibit overcurrent relay. When directional control is required the contacts of the directional relays should be connected as shown. CT connections are typical only. Contacts must close to inhibit overcurrent relay. Figure 4: Application diagram (10 MCGG 42 03): static modular overcurent relay type MCGG 42. trip µC PhA Input circuit Ph 23 Current setting Ph I>Is 45 25 29 30 6 33 34 7 8 35 36 9 10 37 38 11 12 13 14 41 42 15 16 17 18 45 46 19 20 47 48 21 22 49 50 23 24 25 26 27 28 1 2 3 4 5 34 RL1–2 IC Inst setting Curve selection Is RL2–1 Input circuit Ph 27 Vx –VE 28 13 µC PhC 38 RL2–2 1 Phase fault instantaneous trip output contacts I>Is MCGG 42 CT shorting links make before (b) and (c) disconnect. CT connections are typical only. Two phase plus earth fault with instantaneous elements. Short terminals break before (c). 5 . Earthing connections are typical only. trip RL4–2 Case earth connection CT shorting links make before (b) and (c) disconnect. Long terminals Current setting RL3 2 Time delayed trip µC Is 28 +VE Phase fault instantaneous trip output contacts 41 I>Is 44 Vx 42 6 TMS setting 43 E/F 15 µC PhC 36 37 Time delayed trip Inst. When directional control is required the contacts of the directional relays should be connected as shown. trip RL1–1 Output circuits Ph I>Is 33 RL2 2 34 RL1–2 TMS setting 45 Inst setting Curve selection RL2–1 IC Is 26 29 Directional control E/F 30 2 3 4 5 6 33 34 7 8 35 36 9 10 37 38 11 12 Input circuit Ph 13 14 41 42 16 43 44 17 18 45 46 19 20 47 48 21 22 49 50 23 24 25 26 27 28 Module terminal block viewed from rear (with integral case earth strap) Current setting Ph 38 RL2–2 27 RL3–1 Inst setting Curve selection (See Note 3) Notes: 1. P2 A A P1 S2 B S1 C Directional control PhA TMS setting 49 Inst setting Curve selection Indicator reset 50 B C (See Note 2) (See Note 4) Phase rotation 21 IA Is 22 Input circuit Ph 23 Directional control PhC µC PhA Current setting Ph RL1 2 Time delayed trip Inst. Earthing connections are typical only. 2 1 Inst. (a) Phase fault time delayed trip output contacts 37 Time delayed trip Inst. Two phase with instantaneous element. Short terminals break before (c). Long terminals 3. trip Is +VE –VE 50 13 14 17 CT shorting links make before (b) and (c) disconnect. trip I>Is MCGG 62 CT shorting links make 2. (a) 7 5 44 Vx Phase fault instantaneous trip output contacts 6 TMS setting 43 E/F 17 21 Directional control E/F 41 42 Input circuit Ph Case earth 30 36 38 RL2–2 IC 29 Phase fault time delayed trip output contacts 37 25 2 29 30 24 46 1 35 3. When directional control is required the contacts of the directional relays should be connected as shown.P2 A A P1 S2 B Directional control PhA S1 C TMS setting 49 Inst setting Indicator reset Curve selection 50 B C (See Note 2) (See Note 4) Phase rotation 21 IA Is RL1 2 Time delayed trip µC Ph Inst. P2 A A P1 S2 B S1 C Directional control PhA 49 TMS setting Inst setting Is µC PhA Curve selection Indicator reset 50 B C (See Note 2) (See Note 4) Phase rotation 21 IA 22 Directional control PhB Input circuit Ph Current setting Ph TMS setting 47 Time delayed trip RL1–1 Inst. plus earth fault with instantaneous elements. CT connections are typical only. Earthing connections are typical only. Figure 6: Application diagram (10 MCGG 53 02): static modular overcurent relay type MCGG 53. Short terminals break before (c). 4. 6 41 42 Curve selection µC PhC Phase fault time delayed trip output contacts 36 38 RL2–2 28 45 29 30 RL2–1 46 42 45 Current setting Ph 34 RL1–2 37 Time delayed trip Inst. of the directional relays should be connected as shown. Long terminals (b) (c) Input circuit Current setting I>Is RL4–1 RL4 2 Earth fault time delayed trip output contacts 8 9 16 Earth fault instantaneous trip output contacts 15 MCGG 53 2. Earthing connections are typical only. 2 10 RL4–2 Case earth connection (See Note 3) Module terminal block viewed from rear (with integral case earth strap Power supply circuits RL3–2 1 Output circuits 28 Notes: 1. trip 33 RL1 2 I>Is Inst setting Output circuits Ph Curve selection 48 23 IB Is 24 Input circuit Ph 27 Case earth 1 13 14 29 30 33 34 35 36 37 38 41 Directional control PhC 46 47 48 49 50 TMS setting 25 IC Is 26 Vx 21 22 23 24 25 26 (See Note 3) 27 28 Notes: 1. 4. Figure 7: Application diagram (10 MCGG 62 03): static modular overcurent relay type MCGG 62. CT connections are typical only. Two phase (with polyphase measurement). trip 22 Current setting Ph 23 Directional control PhC RL1–1 Output circuits Ph I>Is 33 RL2 2 34 RL1–2 RL2–1 45 26 6 33 34 7 8 35 36 9 10 37 38 11 12 13 14 41 42 15 16 43 44 3 4 5 18 45 46 19 20 47 48 22 23 24 25 26 27 28 49 RL3–1 Inst setting Curve selection 27 RL3 2 Time delayed trip µC Inst. When directional control is required the contacts before (b) and (c) disconnect. trip µC PhB 35 Phase fault instantaneous trip output contacts . Contacts must close to inhibit overcurrent relay. Three phase with instantaneous element. Contacts must close to inhibit overcurrent relay. (a) Module terminal block viewed from rear (with integral case earth strap) RL2 2 I>Is Inst setting (b) (c) +VE –VE 13 14 1 Power supply circuits Input circuit Ph Case earth connection Current setting Ph Time delayed trip Inst. trip 22 Directional control PhB Current setting Ph 47 RL1–1 Output circuits Ph I>Is 35 33 RL2 2 34 RL1–2 29 Phase fault time delayed trip output contacts 30 48 RL2–1 23 38 24 Directional control PhC Case earth RL2–2 41 Phase fault instantaneous trip output contacts 42 45 46 29 25 30 1 2 3 4 5 6 33 34 7 8 35 36 9 10 37 38 11 12 41 42 IC 13 14 15 16 17 18 45 46 19 20 47 48 21 22 49 50 23 24 25 26 27 36 37 IB 26 Input circuit 27 28 Vx +VE –VE 13 14 1 Case earth connection (See Note 3) Notes: 1. Figure 9: Application diagram (10 MCGG 82 03): static modular overcurent relay type MCGG 82. When directional control is required the contacts of the directional relays should be connected as shown. (a) 28 Module terminal block viewed from rear (with integral case earth strap) (b) (c) Power supply circuits CT shorting links make before (b) and (c) disconnect. 7 . RL1–1 Output circuits Ph 42 45 26 Notes: 1.P2 A A P1 S2 B Directional control PhA S1 C 49 TMS setting Inst setting Is µC Ph Indicator reset Curve selection 50 B C (See Note 2) (See Note 4) Phase rotation 21 IA RL1 2 Time delayed trip Inst. Short terminals break before (c). Long terminals MCGG 63 2. trip RL3–2 2 Earth fault time delayed trip output contacts 1 Curve selection Time delayed trip Inst. When directional control is required the contacts of the directional relays should be connected as shown. Long terminals. Contacts must close to inhibit overcurrent relay. 3. Contacts must close to inhibit overcurrent relay. trip I>Is 7 6 Time delayed trip I>Is Inst setting Input circuit Current setting E/F E/F Curve selection µC PhC TMS setting 27 +VE 35 33 RL2 2 I>Is Input circuit Current setting Ph Ph 28 CT shorting links make before (b) and (c) disconnect. (a) Inst setting Input circuit Current setting Ph Ph IC Module terminal block viewed from rear (with integral case earth strap) Inst. A A B P2 S2 P1 S1 C C B Directional control PhA TMS setting 50 N Phase rotation Indicator reset 49 (See Note 2) 21 (See Note 4) IA Is 22 Directional control PhB Case earth 48 30 6 33 34 7 8 35 36 9 10 37 38 11 12 13 14 41 42 15 16 43 44 17 18 45 46 46 19 20 47 48 25 21 22 49 50 2 3 4 5 23 24 25 26 27 28 (b) (c) Is µC PhB TMS setting Is 43 44 2. 4. Earthing connections are typical only. Vx (See Note 3) –VE 34 RL1–2 Curve selection 29 Phase fault time delayed trip output contacts 30 Time delayed trip 36 37 Inst. trip RL2–1 24 Directional control E/F RL1 2 Time delayed trip I>Is TMS setting 23 IB Directional control phase PhC Curve selection µC PhA Input circuit Current setting Ph Ph 47 29 1 Inst setting MCGG 82 RL3 2 RL4–1 8 10 9 Output circuits E/F RL4–2 RL4 2 16 Earth fault instantaneous trip output contacts 15 Case earth connection 3. Figure 8: Application diagram (10 MCGG 63 02): static modular overcurent relay type MCGG 63. CT connections are typical only. trip 38 13 14 17 Inst setting RL2–2 Power supply circuits RL3–1 41 Phase fault instantaneous trip output contacts Is µC E/F 5 Inst. Earthing connections are typical only. 4. Short terminals break before (c). Three phase plus earth fault with instantaneous elements (4 wire system). Three phase (with polyphase measurement) with instantaneous element. CT connections are typical only. With output elements operated they are increased by up to 2.5 10P 20 0.5W 110/250 2.5VA for 5A relays. 63 42.25 VA for 1A relays and less than 0. Current transformer requirements Relay and ct secondary rating (A) Nominal output (VA) Accuracy class Accuracy Limiting lead limit current resistance – (X rated current) one way (ohms) 1 2. DC Burden Relay rating Relay type MCGG MCGG MCGG MCGG 22.5W per element. at unity power factor and at rated current on any setting.Technical Data Ratings AC Current (In) 1A or 5A Frequency 50/60Hz DC Supply (Vx) 24/54V.25Ω for 1A relays and less than 0. Instantaneous earth fault element For installations where the earth fault element is required to have a sensitive setting whilst remaining stable on heavy through faults. Instantaneous setting (Iinst) 1 x –31 x Is in 1 x 1s steps 8 .0W 3.5VA where each step of 2.0W The figures above are maxima under quiescent conditions.5W 4. 48/125V or 110/250V Burdens AC Burden Less than 0. 53 52. please consult the Applications Department of GEC ALSTHOM T&D Protection & Control.5W 4.5W 3.5 10P 20 1 5 7.02Ω for 5A relays and is independent of current. The impedance of the relays over the whole of the setting range (5% to 240% rated current) is less than 0. the ct rating can be increased in steps of 2.0W 3.0W 48/125 2. Setting ranges Time delayed settings (Is). 62 24/54 82 1.15 Note: For 5A applications with longer leads.5W 2.0W 4.06Ω lead resistance. the use of a stabilising resistor is recommended.5W 3. If assistance is required in selecting the appropriate value. phase/ earth fault measuring range: 5% to 240% of In in 5% steps.0W 5. the value of which will vary according to the specific application.5VA is equivalent to additional 0. 4s.0 in 0.3 x Is to 31 x Is 20°C 9 . 8s Time multiplier setting 0.14 t = 0.0 Very inverse t = 13. Input current Time characteristic Reference range Standard inverse Very inverse 2 x Is to 31 x Is Long time inverse Ambient temperature Extremely inverse 2 x Is to 20 x Is Definite time 1.1 1 10 100 I( x Is) Current (multiple of setting) Figure 10: Time delayed overcurrent element – operation time characteristics.025 steps (applicable to all time characteristics) Instantaneous elements Shown in Figure 11 For settings of 5 x Is and above: <35ms at 2x instantaneous setting Accuracy – reference conditions Current setting (Is) Reference range 0.2In to 2. Operating time Time delayed element Operating characteristics selectable to give: Shown in Figure 10 Standard inverse IDMT Very inverse IDMT Extremely inverse IDMT Long time earth fault IDMT Definite time 2s. 82 and E/F element of MCGG53.5 I–1 Extremely inverse t = 280 I –1 0.4In for MCGG 22.05In to 2.05 to 1.4In for phase fault elements of MCGG 53 and 63. 42.02 I –1 Definite 2 seconds 1.100 10 Operating time t (seconds) Definite 8 seconds Definite 4 seconds Longtime standby earth fault t = 120 I–1 Standard inverse 0. 0. 52. 62. Frequency 50Hz to 60Hz Time multiplier setting 1x DC auxiliary voltage Reference ranges 24V to 54V 48V to 125V 110V to 250V Accuracy – influencing quantities On settings 0.5 – 150 110/250 87. DC auxiliary voltage Vx dc(V) Operative range (V) 24/54 19 – 60 48/125 37.5 – 300 240 220 200 180 Operating time (ms) 160 140 120 100 Iinst = 1Is 80 2Is 60 40 5-31Is 4Is 3Is 20 0 1 10 Current (multiple of instantaneous setting) Figure 11: MCGG instantaneous operating times (various settings).05 to 1. over the range 47–52Hz or 57–62Hz.5% Definite time ±3% Frequency Setting current ±1% over the range 47-62Hz Operating time ±2% or ±30ms whichever is the greater.0 ±2% or ±30ms whichever is the greater Time multiplier Ambient temperature Operative range –25°C to +55°C Variations over this range Setting current ±5% Time characteristic Time variation Standard inverse Very inverse Long time inverse ±5% Extremely inverse ±7. 10 100 . This indicator is self resetting.Variations over these ranges Setting current ±1% Operating time ±2% or ±30ms whichever is greater Accuracy – general Current setting Time delayed element 1.5% ±30ms whichever is greater Definite time ±3% Repeatability (within basic accuracy claim) Pick-up current better than ±1% Operating time better than ±2% or ±30ms whichever is greater.0 x Is to 1. Led covers are available to eliminate any undesired led indication. The green timer start indicator illuminates when the input current exceeds the setting current Is to facilitate testing of the module. one showing time delayed operation and the other showing instantaneus operation. 11 .0 x Iinst to 1.1 x Is Instantaneous elements Iinst = 1 x Is 1. The reset button provided on the frontplate resets all the operation indicators. Transient overreach System time constant up to 30ms: 5% (instantaneous elements) System time constant up to 100ms: 12% Thermal withstand Continuous withstand 2 x Is or 2. with a minimum of 1 x In Short time withstand For 1s: 100 x In with 400A maximum For 3s: 57 x In with 230A maximum Operation indicators Each measuring board is fitted with two red led indicators. Resetting current Time delayed and instantaneous elements: not less than 95% of time delayed current setting.1 x Iinst All other settings Iinst ±5% Operating time Time characteristic Accuracy Standard inverse Very inverse Long time inverse ±5% Extremely inverse ±7. Overshoot time Less than 30ms (when the input current is reduced from any value within the operative range to zero). Resetting and disengaging times Less than 70ms (when the input current is reduced from any value within the operative range to zero).6 x In whichever is lower. 0kV rms for 1 minute between all case terminals connected together and the case earth terminal. with the exception of the directional control terminals. 53. Relay type Direction control terminals MCGG 22 23. with terminals on each independent circuit connected together.04s subject to maxima of 5A and 300V Durability Loaded contact 10.0kV rms for 1 minute between terminals of independent circuits. . 50 MCGG 62. High voltage impulse IEC 255-5: 1977 12 Three positive and three negative impulses of 5kV peak. 82 Phase fault time delayed element Changeover Make 1 1 Phase fault instantaneous element 1 1 Earth fault time delayed element 1 1 Earth fault instantaneous element 1 1 MCGG 22. 50 MCGG 52.000 operations minimum Directional control Directional control can be exercised over each pole individually by connecting the output contact of a relay type METI across appropriate case terminals. 2. 46. 49. 1kV rms for 1 minute across open contacts of output relays. L/R = 0. 0. 42. 62. These circuits must not. 53 43 to 46. 49.24 MCGG 42 45. with the exception of the directional control terminals. therefore.Contacts MCGG 52.000 operations minimum Unloaded contact 100.2s 7500VA subject to maxima of 30A and 300V ac or dc Carry continuously 5A ac or dc Break ac – 1250VA dc – 50W resistive 25W. 63 Time delayed element 1 1 Instantaneous element 1 1 Contact ratings Make and carry for 0. (see note). be insulation or impulse tested to the case.5J between all terminals and case earth and between adjacent terminals. 1.2/50µs. 63 45 to 50 MCGG 82 43 to 50 Note: The directional control circuits are isolated from all other circuits but are electrically connected to the relay case. High voltage withstand Dielectric withstand IEC 255-5: 1977 2. 1. 1. Compliance is demonstrated by reference to generic safety standards.Electrical environment High frequency disturbance IEC 255-22-1: 1988 Class III 2. without de-energising. 2. The unit will witstand 12% ac ripple on the dc supply. Note: The directional control terminals comply with class II and will withstand 1kV peak between all independent circuits.0kHz applied directly to all inputs. Atmospheric environment Temperature IEC 255-6: 1988 IEC 68-2-1: 1990 IEC 68-2-2: 1974 Storage and transit –25°C to +70°C Operating –25°C to +55°C Cold Dry heat Humidity IEC 68-2-3: 1969 56 days at 93% RH and 40°C Enclosure protection IEC 529: 1989 IP50 (dust protected) 13 .0kV. 4.0kV peak.5kV peak between independent circuits and case. 4. under normal operating conditions. 5.0kV peak.0kV peak across terminals of the same circuit. Compliance with the European Commission Directive on EMC is claimed via the Technical Construction File route.0kV. DC supply interruption IEC 255-11: 1979 AC ripple on dc supply IEC 255-11: 1979 Fast transient disturbance IEC 255-22-4: 1992 Class IV IEC 801-4: 1988 Level 4 Electrostatic discharge IEC 255-22-2: 1989 Class II IEC 801-2: 1991 Level 2 Surge immunity IEC 1000-4-5: 1995 Level 4 EMC compliance 89/336/EEC EN50081-2: 1994 EN50082-2: 1995 Product safety 73/23/EEC EN 61010-1: 1993/A2: 1995 EN 60950: 1992/A3: 1995 The unit will withstand a 10ms interruption in the auxiliary supply. 1. Compliance with the European Commission Low Voltage Directive.0kV point contact discharge with cover removed. and 500V peak across the directional control terminals. Generic Standards were used to establish conformity. 2.0kV discharge in air with cover in place 4. 4.2/50µs between all groups and case earth.2/50µs between terminals of each group.5kHz applied directly to auxiliary supply. 4. Information Required with Order Relay type (see models available).4 97 23. 13 and 14. 99 Panel cut-out: Flush mounting fixing details.5 All dimensions in mm.Mechanical environment Vibration IEC 255-21-1: 1988 Response Class 1 Endurance Class 1 Cases MCGG 22 Size 4 MCGG 42 Size 6 MCGG 62 Size 6 MCGG 63 Size 6 MCGG 52 Size 8 MCGG 53 Size 8 MCGG 82 Size 8 The dimensions of the cases are shown in Figures 12. Rated current and frequency. (These self adhesive led covers can be supplied to cover the instantaneous led when used in auto-reclose applications as the leds remain on during normal use). 168 159 Push button projection 10 max. DC auxiliary voltage range. 157 max. 32 Flush mounting. Figure 12: Case outline size 4. 177 103 212 11 . Requirement for led cover part GJ0280 001. 52 4 holes 4. 14 25 min. 32 212 25 min.5 All dimensions in mm. 32 25 min. Figure 14: Case outline size 8. 151 Panel cut-out: Flush mounting fixing details.6 4 holes 4. 11 All dimensions in mm. 159 168 Push button projection 10 max. 15 . 157 max. 177 155 Flush mounting.4 149 23.4 200 24 159 168 Push button projection 10 max. 177 206 212 Flush mounting.4 4 holes 4.103. 155. 157 max. 11 Figure 13: Case outline size 6. 203 Panel cut-out: Flush mounting fixing details.