Transcript
Midos
Type MVAJ Tripping and Control Relays
Features ● High speed operation ● High and low burden alternatives ● Low burden models suitable for ac and dc operation ● Models surge proof against high capacitance discharge currents in the dc supply system, are available ● Control relays immune to ac can be supplied
Figure 1: Type MVAJ relay withdrawn from case
Models Available Type MVAJ relays may broadly be divided into three groups: ● High burden tripping relays complying with ESI 48-4 Class EB2 ● Low burden tripping relays which comply with ESI 48-4 Class EB1 ● Control relays which meet the requirements of National Grid Company SPEC.NGTS 2.19:1996 Table 1 lists the general characteristics and includes information on how the relay burden is modified at, or just after operation. ‘Economy’ indicates that the burden is reduced to a low value. Instantaneous cut off is a feature of some hand and electrically reset elements and reduces the burden to
2
zero, whilst others incorporate a time delay to enable to series elements to operate. This time delay is 40ms to 60ms in all cases except that of the types MVAJ 26 and 56 in which the delay is 2s. All low burden relays are suitable for ac or dc operation. All high burden relays are for dc operation only.
burden which is either cut off at operation or economised to a low figure, either instantaneously or after a time delay.
Application
The high burden also permits the use of supervision relays such as type MVAX where the wiring is at risk and provides reliable operation of series elements such as repeat relays type MCAA. For the latter purpose type MVAJ relays can be provided with a time delayed economising feature.
High Burden Tripping Relays Types MVAJ 21, 23, 24, 25, 26, 27, 28, 29, 51, 53, 54, 55, 56, 57, 58 and 59 These relays are suitable for use in high security circuit breaker tripping circuits. In particular they can be used in distributed tripping or control relay contact logic schemes, where the initiating contact may be remote from the relay. The relays have a high
The high burden provides immunity to capacitance discharge currents, which can result at the inception of an earth fault on battery wiring and immunity to the subsequent leakage current.
Relay type
Contact mechanism
Operation indicator
Cut off
Specifications
Group
Outgoing contacts
Case size
single stack
single stack
double stack
double stack
MVAJ 11
SR
H/R
Economy
ESI48-4 EB1
Low burden
5
10
4
4
MVAJ 13
HR
H/R
Instantaneous
ESI48-4EB1
Low burden
5
10
2
4
MVAJ 14
ER
H/SR
Instantaneous
ESI48-4EB1
Low burden
5*
10*
2
4
MVAJ 15
H/ER
H/R
Instantaneous
ESI48-4EB1
Low burden
5*
10*
2
4
MVAJ 17
SR
H/R
Economy
NGC SPEC. NGTS 3.6.3:1992 Low burden
4
–
5
–
MVAJ 21
SR
H/R
Economy
ESI48-4EB2
High burden
5
10
4
4
MVAJ 23
HR
H/R
Instantaneous
ESI48-4EB2
High burden
4
10
2
4
MVAJ 24
ER
H/R
Instantaneous
ESI48-4EB2
High burden
4*
9
2
4
MVAJ 25
H/ER
H/R
Instantaneous
ESI48-4EB2
High burden
4*
9
2
4
MVAJ 26
SR
H/R
Time delay Economy
ESI48-4EB2
High burden
5
10
4
4
MVAJ 27
HR
H/R
Time delay
ESI48-4EB2
High burden
9
4
MVAJ 28
ER
H.R
Time delay
ESI48-4EB2
High burden
8
4
MVAJ 29
H/ER
H/R
Time delay
ESI48-4EB2
High burden
8
4
MVAJ 34
ER
S/R
Instantaneous
NGC SPEC. NGTS 2.19:1996
Control in/out
7
4
4 stacks MVAJ 41
SR
H/R
Economy
ESI48-4EB1
Lowburden
20 Contacts
MVAJ 43
HR
H/R
Instantaneous
ESI48-4EB1
Low burden
20 Contacts
MVAJ 44
ER
H/SR
Instantaneous
ESI48-4EB1
Lowburden
*
18 Contacts
MVAJ 45
H/ER
H/R
Instantaneous
ESI48-4EB1
Lowburden
*
18 Contacts
All in size 8
MVAJ 51
SR
H/R
Economy
ESI48-4EB2
Highburden
20 Contacts
cases
MVAJ 53
HR
H/R
Instantaneous
ESI48-4EB2
High burden
20 Contacts
MVAJ 54
ER
H/R
Instantaneous
ESI48-4EB2
High burden
18 Contacts
MVAJ 55
H/ER
H/R
Instantaneous
ESI48-4EB2
High burden
18 Contacts
MVAJ 56
SR
H/R
Time delay
ESI48-4EB
High burden
20 Contacts
ESI48-4EB2
High burden
18 Contacts
Economy MVAJ 57
HR
H/R
Time delay
MVAJ 58
ER
H/R
Time delay
ESI48-4EB2
High burden
16 Contacts
MVAJ 59
H/ER
H/R
Time delay
ESI48-4EB2
High burden
16 Contacts
KEY SR - Self reset HR - Hand reset ER - Electrical reset H/ER - Hand/electrical reset H/SR - Hand/self reset Note: Relay types indicated * do not have continuously rated reset coils or internally wired cut-off contacts. If required, one pair of outgoing contacts may be wired externally for this duty; this will obviously reduce the number of available contacts.
Table 1: List of MVAJ types available
Low Burden Tripping Relays Types MVAJ 11, 13, 14, 15, 41, 43, 44, 45
connected directly to the dc supply via case terminals.
Description
These relays are suitable for applications where immunity to capacitance discharge and high minimum operation currents are not required.
Since this reduces the necessary break duty on the associated protection output relay, this feature is particularly useful when several tripping relays are operated in parallel.
High Burden Tripping Relays Types MVAJ 21, 23, 24,25, 26, 27, 28, 29, 51, 53, 54, 55, 56, 57, 58 and 59
Low Burden Self-reset Tripping Relay Type MVAJ 17
Control Relay Type MVAJ 34
The type MVAJ 17 is a low burden self-resetting tripping relay which complies with the provisions of NGC SPEC. NGTS.3.63:1992. Its main feature is the facility which allows the economising element circuit to be
All relays use common standardised parts. Versions have one, two or four contact stacks depending upon the number of output contacts required.
This is a dual-rated electrically reset relay, the main function of which is to switch protection and auto-reclosing equipment in and out of service from a remote point via pilot wires. It complies with NGC. SPEC. NGTS 2.19:1996.
3
Types MVAJ 21, 51 high burden self-resetting relays These relays use a contact on the main contact stack to energise a separate, rear-mounted economising element. After operation this reduces the burden by switching in resistance in series with the main element and switching out shunt resistance. Figure 2 shows a typical circuit diagram for self-resetting relays of this type with high speed economy. When the main attracted armature unit RL1 is energised by the protection contact PR, a contact RL1-a energises auxiliary element RL2. When contacts RL2-a and RL2-b open, resistor R4 is put in series with RL1 while the circuit to resistor R2 is broken. Types MVAJ 23, 24, 25, 53, 54, 55 high burden tripping relays with Instantaneous cut-off These relays incorporate a break contact in series with the operate coil. Located on the main contact stack, it is arranged to break the coil circuit once the relay mechanism has
completely operated. This reduces the relay burden to zero as soon as mechanical latching of the contacts has occurred.
cannot conveniently provide an auxiliary contact with a dwell time long enough to ensure correct tripping of the lower voltage circuit breaker.
Types MVAJ 23 and 53 hand reset whilst the types MVAJ 24 and 54 have a second coil which, when energised, unlatches the relay resetting mechanism. Types MVAJ 25 and 55 may be reset either by hand or electrically, by means of the same design of mechanism. See Figure 3.
Typically the relay is initiated by transformer protection, such as overall differential, restricted earth fault, and Buchholz relays, in arrangements where both the HV and LV circuit breakers are to be tripped simultaneously.
Type MVAJ 26 and 56 time delay on drop-off relays The types MVAJ 26 and 56 relays have been specially designed for applications requiring a tripping relay which is self-resetting after a nominal delay of 2 seconds. This relay may be used, for example, for intertripping between the higher voltage and lower voltage circuit breakers of a large three phase power transformer. This may become necessary when the higher voltage circuit breaker is tripped after a heavy internal fault, by protection which
The HV circuit breaker may be expected to trip more quickly than the LV breaker. So the tripping signal is maintained by the delayed resetting, to ensure complete clearance by the LV circuit breaker, even though the fault may have been cleared largely by the HV circuit breaker and the protection has started to reset. The MVAJ 26 and 56 relays can accept either a fleeting initiation or persistent initiation. With the latter, the relay will provide a tripping signal of corresponding duration plus the 2 seconds delay. The relay consists of a main attracted
Combination of output contacts
Left hand Note 1 (a)
14 16
CT shorting links make before (b) & (c) disconnect
(b)
Short terminals break before (c)
(c)
Long terminals
A
RL2-A
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
2 4 6 8 10 12
13 15 17 19 21 23
R1
R4
Case earth
Right hand
RL1 10
(OP)
RL2-B
RL1-A PR
+
27
RL2
Vx V
Module terminal block viewed from rear
_
28
Figure 2: MVAJ 21 self-reset with instantaneous economy (high burden)
4
R. Hand 1 2 3 4 5 6 4 5 6
B
Output contacts to module terminals Contact stack L. hand 13 R. hand 1
R3
L. Hand 7 7 7 7 7 7 8 8 8
R2
Rear mounted facing rear viewed from front A
1 3 5 7 9 11
Combination 10M 9M 1B 8M 2B 7M 3B 6M 4B 5M 5B 4M 6B 3M 7B 2M 8B
Module terminals 15 3
17
19
5
7
21 14 23 16 9
11
2
4
1 2 3 4 5 6 7
M M B B B B M
M M M M B B M
M M M M M M M
M B B B B B M
8
B
B
M
B
Contact Description M : Make B : Break
6
8
M M M B B B
10
12
M M M M M B
armature element with a hand reset operation indicator and one electromagnet with two contact stacks. Types MVAJ 27, 28, 29, 57, 58, 59 relays with time delayed drop-off. These relays are hand reset, electrically reset and hand/electrically reset respectively and all have time delayed cut-off circuits. The burden is reduced to zero 40/60ms after energisation by the use of a second attracted armature element mounted in the rear of the case. This time delay allows ample time for any flagging or auxiliary element in series with the tripping relay to operate before cut-off. Figure 4 shows a typical circuit diagram for an electrically reset trip relay with time delayed cut-off feature. When the contact PR is closed, relays RL1 (operate) and RL2(t) operate. After operation the current in the coil of RL1 (operate) is maintained by contact RL2-a; contacts RL1-a and RL1-b open, whilst RL1-c closes. The opening of RL1-a causes relay RL2(t) to start to reset. This resetting is delayed by 40-60ms by means of a
copper slug fitted to the front of RL2(t). When RL2(t) resets, RL2-a opens, reducing the current through RL1 (operate) coil to zero. The relay is now latched mechanically into the operated state. It may now be reset via an external contact or pushbutton which energises the RL1 (reset) coil via the closed contact RL1-c. Low Burden Tripping Relays Types MVAJ 11, 13, 14, 15, 41, 43, 44, 45 These are low burden versions of types MVAJ 21, 23, 24, 25, 51, 53, 54 and 55 relays respectively. They comply with the less onerous requirements of ESI 48-4, Class EB1. Where self-reset reverse flags are fitted, a maximum of 8 output contacts is available. The operating time is not greater than 15ms
Table 1
Front mounted facing front viewed from front Left hand Right hand
Case earth 1
2
29
30
3
4
31
32
5
6
33
34
7
8
35
36
9
10
37
38
11
12
39
40
13
14
41
42
15
16
43
44
17
18
45
46
19
20
47
48
21
22
49
50
23
24
51
52
25
26
53
54
27
28
55
56
Module terminal block viewed from rear
42 44
30 32 34 36 38 40
41 43 45 47 B
A
Front mounted facing front viewed from front Left hand Right hand
29 31 33 35 37 39
14 16 A
PR
27
RL1-A
R1
RL1 9
(OP)
RL2 9
(OP)
Reset 25
28
Short terminals break before (c)
(c)
Long terminals
–
Output module to module terminals Contact Module terminals stack LH 41 45 42 43 47 44 RL1 RH 29 33 37 30 34 38 RL2
RL1-B
RL1 RL2
(Reset)
26
31 35 39 32 36 40 17 14 15 19 16 1 5 9 2 6 10 3 7 11 4 8 12
LH 13 RH 1 2
CT shorting links make before (b) & (c) disconnect
(b)
Table 2
1 3 5 7 9 11
RL2-A
RL2-B Note 1 (a)
2 4 6 8 10 12
13 15 17 19 B
Vx
+
Combination of output contacts RL1 RL2 Combination R. L. R. L. Hand Hand Hand Hand 18M 1 2 1 2
M M
M M
M M
M
M
M
Contact description M : Make B : Break
(Reset) Note: The numbers quoted in table 1 are for L. hand and R. hand stacks on RL1 and RL2. The code numbers used are for cross references to module terminals in table 2.
Figure 3: MVAJ 55 hand and electrically reset (high burden)
5
Combination of output contacts
Front mounted facing front viewed from front Left hand Right hand
Case earth 1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
B
Vx
1 3 5 7 9 11
2 4 6 8 10 12
13 15 17 19 C
A
+
– PR
RL1-B
27
R1
RL2-A 25
Reset
28
(OP)
RL1 8
R2
RL1-C
(Reset)
RL1 8
26
R3
Note 1 (a)
(t)
RL2
CT shorting links make before (b) & (c) disconnect
(b)
Short terminals break before (c)
(c)
Long terminals
Contact stack L. hand 13
R. Hand 1 2 3 4 5 6 7 6 7
Module terminals 15
R. hand 1
A RL1-A
L. Hand 8 8 8 8 8 8 8 9 9
Output contacts to module terminals
Rear mounted facing rear viewed from front
Module terminal block viewed from rear
Combination 8M 7M 1B 6M 2B 5M 3B 4M 4B 3M 5B 2M 6B 1M 7B 8B
3
17
19
5
7
1 2 3 4 5 6 7
M M B B B B B
M M M M B B B
8 9
M B
M B
9
11
2
M M M M M M B
4
6
M B B B B B B
10
8
12
M M M B B B B
M M M M M B B
Contact Description M : Make B : Break
Figure 4: MVAJ 28 electrically reset with time delayed cut off (high burden)
Table 1 Front mounted facing front viewed from front Left hand Right hand
Case earth 1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
14 16 A
RL1-A PR
27
R1
RL1 10
1 3 5 7 9 11
(OP)
L. Hand 7 7 7 7 7 7 8 8 8
Table 2
Module terminal block viewed from rear
V
(b)
Short terminals break before (c)
(c)
Long terminals
Module terminals
17 21 14 15 19 23 16
28
CT shorting links make before (b) & (c) disconnect
Contact stack L. hand 13 R. hand 1
2. Resistor fitted on 220/250V versions only 3. The numbers quoted for L. hand and R. hand stacks in table1 are code numbers used for cross references to module terminals in table 2
3
5
7
9
11
Figure 5: MVAJ 13 hand reset (low burden)
2
4
1 2 3 4 5 6 7
M M B B B B M
M M M M B B M
M M M M M M M
M B B B B B M
8
B
B
M
B
Contact Description M : Make B : Break
6
R. Hand 1 2 3 4 5 6 4 5 6
Output contacts to module terminals
Vx
Notes 1. (a)
2 4 6 8 10 12
13 15 17 19 21 23
Combination of output contacts Combination 10M 9M 1B 8M 2B 7M 3B 6M 4B 5M 5B 4M 6B 3M 7B 2M 8B
6
8
M M M B B B
10
12
M M M M M B
Technical Data Ratings All relays except MVAJ 17. and MVAJ 34
MVAJ 17
Rated voltage (Vx)
Operative range (V)
24/27 30/34* 48/54* 110/125* 220/250 110/125
14.4 – 32.4 18 – 40.8 28.8 – 64.8 66 – 150 122 – 300 66 –150
MVAJ 34 dual rated 48/54 110/125 220/250
0Ω pilot
200Ω pilot
37.5 – 60 87.5 –137.5 122 – 286
46 – 56 87.5 – 137.5 175 – 275
*These ranges only are applicable to ESI 48-4 Burdens Burden (W) To operate Relay type
Single stack
MVAJ 11 25 MVAJ 13 25 MVAJ 14 25 MVAJ 15 25 MVAJ 17 25 MVAJ 21 150 MVAJ 23 150 MVAJ 24 150 MVAJ 25 150 MVAJ 26 150 MVAJ 27 – MVAJ 28 – MVAJ 29 – MVAJ34 (See Note 3 below) MVAJ 41 MVAJ 43 MVAJ 44 MVAJ 45 MVAJ 51 MVAJ 53 MVAJ 54 MVAJ 55 MVAJ 56 MVAJ 57 MVAJ 58 MVAJ 59
Operated
To reset
Double stack
Single stack
Double stack
50 10 50 – 50 – 50 – (See Note 2 below) 150 10 150 – 150 – 150 – 150 12.5 150 – 150 – 150 – 10 – 25 – 50 – 50 12.5 50 – 50 – 50 – 150 15 150 – 150 – 150 – 150 12.5 150 – 150 – 150 –
– – 15 15
– – 25 25
– – 50 50 – – – –
– – 50 50 – – 50 50 10 25 25 – – 45 45 – – 70 70 – – 70 70
Minimum operating current (mA) 25 25 25 25 25 100 100 100 100 100 100 100 100 25 25 25 25 25 25 25 100 100 100 100 100 100 100 100
Note 1: Minimum operating current for relays specified in ESI 48-4 Class EB1 is 25mA and in EB2 is 50mA for 110V dc rating Note 2: The burden of the relay before it economises is less than 25W, reducing to 2.1W after. The auxiliary, which is fed from a separate supply, remains at 3.85W. Note 3: The 3 sets of burdens quoted for MVAJ 34 apply to the 48/54, 110/125 and 220/250V versions respectively.
7
Operating time MVAJ 11–15 fitted with self reset reverse flags All other types
15ms Not greater than 10ms at rated voltage
Operation indicator MVAJ 34
The operation indicator follows the relay operation.
Contacts
The number of contacts available is shown in Table 1. They may be any combination of make type and break type but with a maximum of 8 break.
Contact ratings Make and carry for 3s
ac 7500VA with maxima of 30A or 300V dc 7500W with maxima of 30A or 300V
Make and carry continuously
ac 1250VA with maxima of 5A or 300V dc 1250W with maxima of 5A or 300V
Break
ac 1250VA with maxima of 5A or 300V dc 100W resistive 50W inductive with maxima of 5A or 300V
Withstand Ratings MVAJ 17
The relay shall not operate when a 1µf capacitor charged to 150V is discharged into its operate circuit. The relay is continously rated at 150V dc.
MVAJ 34
Operation/resetting does not occur when 100V ac rms 50/60Hz is applied to the respective coil circuits. The relay (at 50V range or above) will operate with pilot wires having a resistance of 200Ω.
MVAJ 21 – 29 & 51– 59
These relays will withstand without operating, the discharge into their operate circuits of a 10µF capacitor charged to a voltage equal to the highest in the operative range for the relay All relays are continously rated with the exceptions listed in Table 1.
Specifications
8
MVAJ 17
NGC SPEC.NGTS 3.6.3:1992
MVAJ 34
NGC SPEC.NGTS 2.19:1996
All other relays
IEC 255
High Voltage withstand Dielectric withstand IEC 255-5:1977
2kV rms for 1 minute between all terminals and case earth. 2kV rms for 1 minute between terminals of independent circuits including contact circuits,with terminals on each independent circuit connected together. 1kV rms for 1 minute across open contacts of output relays.
High voltage impulse IEC 255-5:1977
Three positive and three negative impulses of 5kV peak, 1.2/50 µs, 0.5J between all terminals and all terminals and case earth.
Electrical environment High frequency disturbance IEC 255-22-1:1988 Class III
2.5kV peak between independent circuits and case. 1.0kV peak across terminals of the same circuit.
EMC compliance 89/336/EEC
EN 50081-2:1994 EN 50082-2:1995 Product safety 72/23/EEC EN 61010-1:1993/A2:1995 EN 60950:1992/A3:1995
Compliance to the European Commission Directive on EMC is claimed via the Technical Construction File route. Generic Standards were used to establish conformity. Compliance with European Commission Low Voltage Directive Compliance is demonstrated by reference to generic safety standards.
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)
Mechanical environment Vibration IEC 255-21-1:1988
0.5g between 10Hz and 150Hz
Mechanical durability Loaded contact Unloaded contact
10,000 operations minimum 100,000 operations minimum
9
45
13
4 holes 4.4
24
168
159
Push button projection 10 max
48 Panel cut-out: Flush mounting fixing details 32
25 min.
212
177
157 max.
Reset 51
Flush mounting
All dimensions in mm
Figure 6: Case outline size 2
4 holes 4.4
97
52 23.5
168
Push button projection 10 max
159
99 Panel cut-out: Flush mounting fixing details 32
212
177
25 min.
157 max.
Reset 103
All dimensions in mm
Figure 7: Case outline size 4
10
Flush mounting
11
4 holes 4.4
200
155.4 24
168
Push button projection 10 max
159
203 Panel cut-out: Flush mounting fixing details
32
212
177
25 min.
157 max.
Reset 206
Flush mounting
11
All dimensions in mm
Figure 8: Case outline size 8
Cases MVAJ relays are housed in size 2, 4 or 8 cases as indicated in Table 1. Dimensions for these cases are shown in Figures 6, 7 and 8 respectively.
Information Required with Order Relay type Voltage rating Number and combination of contacts for tripping duties Hand reset operation indicator required Instantaneous or time delayed cut-off contact
11
