Type MCGG 22, 42, 52, 53, 62, 63 & 82
Overcurrent Relay for Phase and Earth Faults
Type MCGG 22, 42, 52, 53, 62, 63 & 82
Overcurrent Relay for Phase and Earth Faults
Figure 1: Relay type MCGG 62
withdrawn from case.
Features
• Choice of 4 inverse time curves
and 3 definite time ranges by
switched selection.
• Accurately follows time curves to
BS142 and IEC60255.
• High resetting ratio.
• Fast resetting time.
• Wide setting range of 0.05 x In
to 2.4 x In in steps of 0.05 x In.
• Positive, calibrated settings by
means of switches.
• Time multiplier range 0.05 to 1
on all seven characteristics.
• Internal dc auxiliary power
supply operating over a wide
input range.
• 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.
2
• Separate test mode with trip test
feature.
• Indication of power to the
measuring board.
• Non-volatile memory for time
delayed and instantaneous LED
indicators.
MCGG 53
Two phase overcurrent (with
polyphase measurement) plus earth
fault with instantaneous elements.
Models available
MCGG 22
Single phase overcurrent with
instantaneous element.
MCGG 62
Three phase overcurrent with
instantaneous elements.
MCGG 42
Two phase overcurrent with
instantaneous elements.
Associated publications:
Midos System R6001
Directional Relay R6003
MCGG 63
Three phase overcurrent (with
polyphase measurement), with
instantaneous element.
MCGG 52
Two phase overcurrent plus earth
fault with instantaneous elements.
3 phase
2 phase Single phase Measuring
overcurrent overcurrent or earthfault
boards
†
inst
†
inst
†
inst
Model
MCGG
MCGG
MCGG
MCGG
MCGG
MCGG
MCGG
MCGG 82
Three phase overcurrent plus earth
fault with instantaneous elements.
22
42
52
53
62
63
82
Application
The relay can be used in
applications where time graded
overcurrent and earth fault
protection is required.
The relay can be used to provide
selective protection for overhead
and underground distribution
feeders. Other applications include
back-up protection for transformers,
generators and HV feeder circuits
and the protection of neutral
earthing resistors.
With all the current/time
characteristics available on one
relay, a standard relay can be
ordered before detailed coordination studies are carried out –
a distinct advantage for complex
systems. Also, changes in system
configuration can be readily
accommodated.
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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. The current
transformers for this application
must satisfy the criteria detailed
under ‘Current transformer
requirements’ in Technical Data.
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, but in some
applications a non-linear resistor is
required to limit this voltage.
Non-standard resistance values and
non-linear voltage limiting devices
are available.
An instantaneous element with low
transient overreach is incorporated
within each phase or earth fault
measuring board. This can be easily
disabled in applications where it is
not required.
3
1
2
3
2
3
1
4
Case
size
4
6
8
8
6
6
8
Description
This range of MCGG relays is
designed so that versions are
available with separate measuring
boards for each phase or earth fault
input; alternatively, phase inputs
may be combined on to one board
for polyphase measurement (see
table). These boards, together with
the other circuits of the relay, are
contained in a single plug-in module
which is supplied in a size 4, 6 or 8
Midos case. The case incorporates
one or two terminal blocks for
external connections. Removal of the
module automatically short circuits
the current transformer connections
by means of safety contacts within
the case terminal block. For added
security, when the module is
removed, the CT circuits are short
circuited before the connections to
the output contacts and the dc
supply are broken. The relay uses
solid state techniques, each
measuring board utilising a microcomputer as a basic circuit element.
The current measurement, whether
performed on a single phase or
polyphase input, is performed via
an analogue-to-digital converter.
Application diagrams are provided
in Figures 2 to 8 (inclusive) showing
typical wiring configurations.
Each measuring board has a built-in
‘power off’ memory feature for the
time delayed and instantaneous LED
indicators.
Power to each measuring board
may be tested whilst the relay is in
service, without affecting the current
measurement. A test mode is also
available to carry out a trip test on
the output relays. During this test,
current measurement is inhibited.
When required, directional control
can be exercised over the relay by
connecting an output contact from
direction relay type METI to the
terminals provided.
Separate output contacts, capable
of circuit breaker tripping, are
provided for time delayed phase
faults, instantaneous phase faults,
time delayed earth fault and
instantaneous earth fault operations.
Switch position
(0)
(1)
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●
Operating
characteristic
Trip test
●
●
●
Standard inverse
t=
0.14
(I0.02 – 1)
sec SI
Very inverse
t=
13.5
(I – 1)
sec VI
●
Extremely inverse
t=
80
(I2 – 1)
sec EI
●
●
Long time earth fault t =
120
(I – 1)
sec LT
●
●
●
●
●
●
●
●
Definite time 2 seconds
D2
Definite time 4 seconds
D4
Definite time 8 seconds
D8
●
●
●
●
●
●
●
Table1: Operating time characteristics with corresponding switch positions.
Relay settings
Separate setting switches for each
measuring board are provided on
the relay frontplate. These are used
to select the required time/current
characteristic, current and time
multiplier settings.
Selection of time
characteristics
The current/time characteristic
selection is carried out by means of
three switches (identified by
symbol on the nameplate).
Table 1 gives the basic operating
characteristic and the settings of the
switches.
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. This control is marked xt = Σ
where Σ is the sum of all the switch
positions.
The range of multiplication is from
0.05x to 1.0x in steps of 0.025.
4
This acts as a conventional time
multiplier on the current dependent
characteristics and gives the
following time ranges for the
definite time characteristics.
Operating
characteristics
s
2
4
8
Time range
s
0.1 to 2.0 in 0.05s steps
0.2 to 4.0 in 0.1s steps
0.4 to 8.0 in 0.2s steps
Trip test
Current setting
Current measurement is inhibited by
setting the curve selection switches
to 111. This causes all three LEDs to
flash once per second. If the reset
push button is then pressed for
approximately six seconds, both
output relays associated with that
measuring board will operate.
Time delayed element
The current setting control is marked
Is = Σ x In where Is is the current
setting in amps, Σ is the sum of all
the switch positions and In is the
relay rated current in amps.
Each measuring board provides a
setting range of 0.05 x In to 2.4 x
In in steps of 0.05 x In.
Power supply healthy test
If, whilst the relay is in service, the
reset button is pressed, all the LEDs
are illuminated, indicating that there
is power to the measuring boards.
The LEDs are reset on releasing the
push button. During this test, normal
current measurement is not
inhibited.
Instantaneous element
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.
When all switches are set to the left
(at zero), or when the lowest switch
is set to infinity regardless of the
positions of the other five switches,
the instantaneous feature is
rendered inoperable. The range of
adjustment of finite settings is from
1x to 31x in unity steps.
A
S2
A
P1
P2
B
Figure 2: Type MCGG 22 nameplate
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
Time delayed trip
Inst. trip
µC
PhA
Is
Indicator
reset
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)
RL1–2
2
CT shorting links make
before (b) and (c) disconnect.
Short terminals break before (c).
Long terminals
2. When directional control is required the contacts
of the directional relays should be connected as shown.
Contacts must close to inhibit overcurrent relay.
3. Earthing connections (CTs) are typical only.
4. CT connections are typical only.
Figure 3: Application diagram (10 MCGG 22 02): static modular overcurent relay type MCGG 22.
Single phase with instantaneous element.
5
Phase fault
time delayed
trip output
contacts
1
RL2–1
8
10
9
RL2–2
16
15
MCGG 22
Notes:
1. (a)
7
6
Phase fault
instantaneous
trip output
contacts
A
A
P2
P1
S2
B
S1
Directional
control
PhA
C
C
B
Phase rotation (See Note 4)
TMS
setting
Inst
setting
Curve
selection
Indicator
reset
49
50
(See Note 2)
21
IA
Is
RL1
2
Time delayed trip
Inst. 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
1
2
3
4
5
IC
Inst
setting
Curve
selection
18
45
46
19
20
47
48
21
22
49
50
23
24
25
26
27
28
Input
circuit
Ph
27
+VE
–VE
28
13
1
38
RL2–2
41
Phase fault
instantaneous
trip output
contacts
I> Is
MCGG 42
CT shorting links make
before (b) and (c) disconnect.
Short terminals break before (c).
Long terminals
(b)
(c)
36
42
Current
setting
Ph
Case earth connection
Module terminal block
viewed from rear
(with integral case earth strap)
Phase fault
time delayed
trip output
contacts
Power
supply
circuits
14
(See Note 3)
Notes:
1. (a)
29
37
Time
delayed trip
Inst. trip
µC
PhC
Is
RL2–1
26
Vx
17
34
RL1–2
30
TMS
setting
46
Case earth
35
33
RL2
2
24
Directional
control
PhC
RL1–1
Output
circuits
Ph
22
2. When directional control is required the contacts
of the directional relays should be connected as shown.
Contacts must close to inhibit overcurrent relay.
3. Earthing connections are typical only.
4. CT connections are typical only.
Figure 4: Application diagram (10 MCGG 42 03): static modular overcurent relay type MCGG 42.
Two phase with instantaneous element.
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
Current
setting
Ph
RL1
2
Time delayed trip
µC
PhA
Inst. trip
I >I s
RL1–1
Output
circuits
Ph
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
38
RL2–2
RL3–1
Inst
setting
Curve
selection
Notes:
1. (a)
(b)
(c)
–VE
7
5
13
14
17
Power
supply
circuits
Input
circuit
Current
setting
Inst. trip
RL3–2
I >I s
RL4–1
RL4
2
8
9
16
15
3. Earthing connections are typical only.
4. CT connections are typical only.
Figure 5: Application diagram (10 MCGG 52 03): static modular overcurent relay type MCGG 52.
Two phase plus earth fault with instantaneous elements.
6
Earth fault
time delayed
trip output
contacts
10
MCGG 52
2. When directional control is required the contacts
of the directional relays should be connected as shown.
Contacts must close to inhibit overcurrent relay.
2
1
Output
circuits
RL4–2
Case earth connection
CT shorting links make
before (b) and (c) disconnect.
Short terminals break before (c).
Long terminals
RL3
2
Time delayed trip
µC
Is
28
Vx
Phase fault
instantaneous
trip output
contacts
6
27
+VE
42
41
I >I s
44
(See Note 3)
Module terminal block
viewed from rear
(with integral case earth strap)
Current
setting
Ph
TMS
setting
43
E/F
15
µC
PhC
36
37
Time
delayed trip
Inst. trip
25
1
29
Phase fault
time delayed
trip output
contacts
30
24
46
Case earth
35
Earth fault
instantaneous
trip output
contacts
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. trip
22
Current
setting
Ph
23
Directional
control
PhC
RL1–1
35
Output
circuits
Ph
I >I s
33
RL2
2
34
RL1–2
29
30
24
RL2–1
45
36
37
46
38
25
RL2–2
IC
41
26
29
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
19
20
47
48
2
3
4
5
21
22
23
24
25
26
27
Directional
control
E/F
RL3–1
Inst
setting
27
Curve
selection
5
RL3
2
Time delayed trip
µC
E/F
49
Inst. trip
Is
13
+VE
14
–VE
17
50
Module terminal block
viewed from rear
(with integral case earth strap
CT shorting links make
before (b) and (c) disconnect.
Short terminals break before (c).
Long terminals
(b)
(c)
Input
circuit
Current
setting
I >I s
2
RL4–1
Earth fault
time delayed
trip output
contacts
8
RL4
2
10
9
RL4–2
Case earth connection
(See Note 3)
28
Power
supply
circuits
RL3–2
1
Output
circuits
28
Notes:
1. (a)
7
6
TMS
setting
43
44
Vx
Phase fault
instantaneous
trip output
contacts
42
Input
circuit
Ph
Case earth
1
Phase fault
time delayed
trip output
contacts
16
Earth fault
instantaneous
trip output
contacts
15
MCGG 53
2. When directional control is required the contacts
of the directional relays should be connected as shown.
Contacts must close to inhibit overcurrent relay.
3. Earthing connections are typical only.
4. CT connections are typical only.
Figure 6: Application diagram (10 MCGG 53 02): static modular overcurent relay type MCGG 53.
Two phase (with polyphase measurement), plus earth fault with instantaneous elements.
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
22
Directional
control
PhB
Input
circuit
Ph
Current
setting
Ph
TMS
setting
47
Time delayed trip
µC
PhA
Is
RL1–1
Inst. trip
Inst
setting
33
RL1
2
I>Is
Curve
selection
Output
circuits
Ph
48
23
IB
24
Case earth
1
13
14
29
30
33
34
35
36
37
38
41
42
45
46
47
48
49
50
Directional
control
PhC
Input
circuit
Ph
Current
setting
Ph
34
RL1–2
TMS
setting
38
RL2–2
I>Is
Inst
setting
25
IC
26
Vx
22
23
24
25
26
(See Note 3)
27
28
Notes:
1. (a)
(b)
(c)
+VE
–VE
13
14
1
Power
supply
circuits
Input
circuit
Ph
Current
setting
Ph
Case earth connection
Time delayed trip
Inst. trip
I>Is
MCGG 62
CT shorting links make
2. When directional control is required the contacts
before (b) and (c) disconnect.
of the directional relays should be connected as shown.
Short terminals break before (c).
Contacts must close to inhibit overcurrent relay.
Long terminals
3. Earthing connections are typical only.
4. CT connections are typical only.
Figure 7: Application diagram (10 MCGG 62 03): static modular overcurent relay type MCGG 62.
Three phase with instantaneous element.
7
41
42
Curve
selection
µC
PhC
Is
36
37
RL2
2
28
45
29
Phase fault
time delayed
trip output
contacts
30
RL2–1
46
21
Module terminal block
viewed from rear
(with integral case earth strap)
µC
PhB
Is
27
Time
delayed trip
Inst. trip
35
Phase fault
instantaneous
trip output
contacts
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. 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
36
37
IB
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
28
26
Input
circuit
27
28
Vx
+VE
–VE
13
14
1
Case earth connection
(See Note 3)
Notes:
1. (a)
Module terminal block
viewed from rear
(with integral case earth strap)
Power
supply
circuits
CT shorting links make
before (b) and (c) disconnect.
Short terminals break before (c).
Long terminals
(b)
(c)
MCGG 63
2. When directional control is required the contacts
of the directional relays should be connected as shown.
Contacts must close to inhibit overcurrent relay.
3. Earthing connections are typical only.
4. CT connections are typical only.
Figure 8: Application diagram (10 MCGG 63 02): static modular overcurent relay type MCGG 63.
Three phase (with polyphase measurement) with instantaneous element.
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
29
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
19
20
47
48
21
22
49
50
1
2
3
4
5
23
24
25
26
27
28
Is
24
TMS
setting
25
IC
Is
43
28
2. When directional control is required the contacts
of the directional relays should be connected as shown.
Contacts must close to inhibit overcurrent relay.
(See Note 3)
–VE
34
RL1–2
29
Phase fault
time delayed
trip output
contacts
30
36
37
Inst. trip
38
RL2–2
I>Is
13
14
17
Inst
setting
Power
supply
circuits
RL3–1
41
Phase fault
instantaneous
trip output
contacts
Is
µC
E/F
5
Inst. trip
RL3–2
Time delayed trip
Inst. trip
RL3
2
RL4–1
Earth fault
time delayed
trip output
contacts
8
10
9
Output
circuits
E/F
MCGG 82
Case earth connection
3. Earthing connections are typical only.
4. CT connections are typical only.
Figure 9: Application diagram (10 MCGG 82 03): static modular overcurent relay type MCGG 82.
Three phase plus earth fault with instantaneous elements (4 wire system).
8
2
1
Curve
selection
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
Vx
RL2
2
Time delayed trip
µC
PhB
35
33
Curve
selection
Inst
setting
Input circuit Current setting
Ph
Ph
44
+VE
RL1–1
Output
circuits
Ph
42
45
26
CT shorting links make
before (b) and (c) disconnect.
Short terminals break before (c).
Long terminals.
Inst. trip
I>Is
Input circuit Current setting
Ph
Ph
46
Directional
control E/F
RL1
2
Time delayed trip
RL2–1
IB
Notes:
(b)
(c)
TMS
setting
23
Module terminal block
viewed from rear
(with integral case earth strap)
1. (a)
47
Curve
selection
µC
PhA
Input circuit Current setting
Ph
Ph
48
Directional
control
phase PhC
Inst
setting
RL4–2
RL4
2
16
15
Earth fault
instantaneous
trip output
contacts
Technical Data
Ratings
AC current (In)
1A or 5A
Frequency
50/60Hz
DC supply (Vx)
24/54V, 48/125V or 110/250V
Burdens
AC Burden
Less than 0.25 VA for 1A relays and
less than 0.5VA for 5A relays, at
unity power factor and at rated
current on any setting.
The impedance of the relays over
the whole of the setting range (5%
to 240% rated current) is less than
0.25Ω for 1A relays and less than
0.02Ω for 5A relays and is
independent of current.
DC burden
Relay
rating
Relay type
MCGG
MCGG
MCGG
MCGG
22, 63
42, 53
52, 62
82
24/54
1.5W
2.5W
3.0W
4.0W
48/125
2.0W
3.0W
3.5W
4.5W
110/250
2.5W
3.5W
4.0W
5.0W
The figures above are maxima under quiescent conditions.
With output elements operated they are increased by up to
2.5W per element.
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
2.5
10P
20
1
5
7.5
10P
20
0.15
Note: For 5A applications with longer leads, the CT rating can be increased
in steps of 2.5VA where each step of 2.5VA is equivalent to additional
0.06Ω lead resistance.
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, the use of a stabilising
resistor is recommended, the value of which will vary according to the
specific application. If assistance is required in selecting the appropriate
value, please consult the Applications Department of ALSTOM T&D
Protection & Control Ltd.
9
Time delayed settings (Is), phase/
earth fault measuring range: 5% to
240% of In in 5% steps.
Setting ranges
Instantaneous setting (Iinst)
1 x –31 x
Is in 1 x 1s steps
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, 4s, 8s
Time multiplier setting
0.05 to 1.0 in 0.025 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 0.05In to 2.4In for
MCGG 22, 42, 52, 62, 82 and
E/F element of MCGG53.
0.2In to 2.4In for phase fault
elements of MCGG 53 and 63.
Input current
Time
characteristic
Reference
range
Standard inverse
Very inverse
Long time inverse
2 x Is to 31 x Is
Extremely inverse
2 x Is to 20 x Is
Definite time
1.3 x
Ambient temperature
20°C
Frequency
50Hz to 60Hz
Time multiplier setting
1x
DC auxiliary voltage
Reference ranges
Is to 31 x Is
24V to 54V
48V to 125V
110V to 250V
10
100
10
Operating time t (seconds)
Definite 8 seconds
Definite 4 seconds
Longtime standby
earth fault
120
t=
I–1
Standard inverse
0.14
t = 0.02
I –1
Definite 2 seconds
1.0
Very inverse
13.5
t=
I–1
Figure 10: Time delayed overcurrent element –
operation time characteristics.
Extremely inverse
80
t= 2
I –1
0.1
1
10
100
I( x Is)
Current (multiple of setting)
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).
11
100
Accuracy – influencing quantities
On settings 0.05 to 1.0 ±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
±7.5%
Definite time
±3%
Frequency
Setting current
±1% over the range 47 – 62Hz
Operating time
±2% or ±30ms whichever is the
greater, over the range 47–52Hz or
57–62Hz.
DC auxiliary voltage
Vx dc(V)
Operative range (V)
24/54
19 – 60
48/125
37.5 – 150
110/250
87.5 – 300
Variations over these ranges
Setting current
±1%
Operating time
±2% or ±30ms whichever is greater
Accuracy – general
Current setting
Time delayed element
Instantaneous elements
All other settings
Is to 1.1 x Is
Iinst = 1 x Is 1.0 x Iinst to 1.1 x Iinst
Iinst ±5%
1.0 x
Operating time
Time characteristic
Accuracy
Standard inverse
Very inverse
Long time inverse
±5%
Extremely inverse
±7.5% ±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.
Overshoot time
Less than 30ms (when the input
current is reduced from any value
within the operative range to zero).
12
Resetting current
Time delayed and instantaneous
elements: not less than 95% of time
delayed current setting.
Resetting and disengaging times
Less than 70ms (when the input
current is reduced from any value
within the operative range to zero).
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 2.6 x In whichever is
lower, with a minimum of 1 x In
Short time withstand
For 1s: 100 x
maximum
For 3s: 57 x
maximum
In with 400A
In with 230A
Operation indicators
Each measuring board is fitted with
two red LED indicators, one showing
time delayed operation and the
other showing instantaneus
operation. The reset button provided
on the frontplate resets all the
operation indicators.
The green timer start indicator
illuminates when the input current
exceeds the setting current Is to
facilitate testing of the module.
This indicator is self resetting.
LED covers are available to
eliminate any undesired LED
indication.
Contacts
Changeover Make
MCGG 52, 53, 82
Phase fault time delayed element
1
1
Phase fault instantaneous element
1
1
Earth fault time delayed element
1
1
Earth fault instantaneous element
1
1
MCGG 22, 42, 62, 63 Time delayed element
1
1
Instantaneous element
1
1
13
Contact ratings
Make and carry for 0.2s
and 300V ac or dc
7500VA subject to maxima of 30A
Carry continuously
5A ac or dc
Break
ac – 1250VA
dc – 50W resistive
25W, L/R = 0.04s
subject to
maxima of
5A and 300V
Durability
Loaded contact
10,000 operations minimum
Unloaded contact
100,000 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.
Relay type
Direction control terminals
MCGG 22
23,24
MCGG 42
45, 46, 49, 50
MCGG 52, 53
43 to 46, 49, 50
MCGG 62, 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. These circuits must not,
therefore, be insulation or impulse tested to the case.
High voltage withstand
Dielectric withstand
IEC 60255-5: 1977
2kV rms for 1 minute between all
case terminals connected together
and the case earth terminal, with the
exception of the directional control
terminals.
2kV rms for 1 minute between
terminals of independent circuits,
with terminals on each independent
circuit connected together.
1kV rms for 1 minute across open
contacts of output relays.
High voltage impulse
IEC 60255-5: 1977
14
Three positive and three negative
impulses of 5kV peak, 1.2/50µs,
0.5J between all terminals and case
earth and between adjacent
terminals, with the exception of the
directional control terminals,
(see note).
Electrical environment
High frequency disturbance
IEC 60255-22-1: 1988 Class III
2.5kV peak between independent
circuits and case earth.
1kV peak across terminals of the
same circuit.
Note: The directional control
terminals comply with class II and
will withstand 1kV peak between all
independent circuits, and 500V
peak across the directional control
terminals.
DC supply interruption
IEC 60255-11: 1979
AC ripple on dc supply
IEC 60255-11: 1979
Fast transient disturbance
IEC 60255-22-4: 1992 Class IV
Electrostatic discharge
IEC 60255-22-2: 1996 Class II
Surge immunity
IEC 61000-4-5: 1995 Level 4
EMC compliance
89/336/EEC
EN50081-2: 1994
EN50082-2: 1995
Product safety
73/23/EEC
The unit will withstand a 10ms
interruption in the auxiliary supply,
under normal operating conditions,
without de-energising.
The unit will witstand 12% ac ripple
on the dc supply.
4kV, 2.5kHz applied directly to
auxiliary supply.
4kV, 2.5kHz applied directly to
all inputs.
4kV discharge in air with cover
in place
4kV contact discharge with cover
removed.
4kV peak, 1.2/50µs between all
groups and case earth.
2kV peak, 1.2/50µs between
terminals of each group.
Compliance with the European
Commission Directive on EMC is
claimed via the Technical
Construction File route.
Generic Standards were used to
establish conformity.
Compliance with the European
Commission Low Voltage Directive.
EN 61010-1: 1993/A2: 1995
EN 60950: 1992/A11: 1997
15
Compliance is demonstrated by
reference to generic safety
standards.
Atmospheric environment
Temperature
IEC 60255-6: 1988
IEC 60068-2-1: 1990
IEC 60068-2-2: 1974
Storage and transit
–25°C to +70°C
Operating –25°C to +55°C
Cold
Dry heat
Humidity
IEC 60068-2-3: 1969
56 days at 93% RH and 40°C
Enclosure protection
IEC 60529: 1989
IP50 (dust protected)
Mechanical environment
Vibration
IEC 60255-21-1: 1988
16
Response Class 1
Endurance Class 1
Cases
52
MCGG 22 Size 4
MCGG 42 Size 6
4 holes Ø4.4
97
23.5
MCGG 62 Size 6
All dimensions in mm.
MCGG 63 Size 6
168
159
MCGG 52 Size 8
MCGG 53 Size 8
Push button
projection 10 max.
MCGG 82 Size 8
99
Panel cut-out:
Flush mounting fixing details.
The dimensions of the cases are
shown in Figures 12, 13 and 14.
32
212
25 min.
157 max.
177
103
11
Flush mounting.
Figure 12: Case outline size 4.
103.6
4 holes Ø4.4
149
23.5
All dimensions in mm.
159
168
Push button
projection 10 max.
151
Panel cut-out:
Flush mounting fixing details.
32
Flush mounting.
Figure 13: Case outline size 6.
17
25 min.
157 max.
177
155
212
11
155.4
4 holes Ø4.4
200
24
159
168
Push button
projection 10 max.
203
Panel cut-out:
Flush mounting fixing details.
32
Flush mounting.
All dimensions in mm.
Figure 14: Case outline size 8.
Information Required
with Order
Relay type (see models available).
Rated current and frequency.
DC auxiliary voltage range.
Requirement for LED cover part
GJ0280 001.
(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).
18
25 min.
157 max.
177
206
212
11
19
ALSTOM T&D Protection & Control Ltd St Leonards Works, Stafford, ST17 4LX England
Tel: 44 (0) 1785 223251 Fax: 44 (0) 1785 212232 Email: pcs.enquiries@tde.alstom.com Internet: www.alstom.com
©1999 ALSTOM T&D Protection & Control Ltd
Our policy is one of continuous development. Accordingly the design of our products may change at any time. Whilst every effort is made to produce up to date literature, this brochure should
only be regarded as a guide and is intended for information purposes only. Its contents do not constitute an offer for sale or advice on the application of any product referred to in it.
ALSTOM T&D Protection & Control Ltd cannot be held responsible for any reliance on any decisions taken on its contents without specific advice.
Publication R6054X
089920 CPS Printed in England.