Download Trip circuit and Trip Coil supervision Relay

PROTECTION
Trip circuit and Trip Coil supervision Relay
Type VAX / MVAXM
Customer Benefits
• Trip circuit and Trip coil supervision relay
• Choice of pre-closing and
Post-closing supervision
• Simple and robust construction
• Draw out type case
• Completely dust proof by
IP5X class protection
GRID
1
Type VAX / MVAXM
Types VAX & MVAXM
Trip circuit supervision relays
Features
• Simple and robust construction
• Positive action without chatter
• Choice of pre-closing and post-closing supervision
Application
Post-closing or continuous supervision of the trip circuit of circuit breakers
General description
Type VAX and MVAXM relays are of simple and robust construction. They are arranged to initiate an audible alarm and
visual indication if the trip circuit of a circuit breaker fails or the
breaker tripping mechanism does not operate
Two versions of type VAX and MVAXM relays are available.
Type VAX 21 and MVAXM 21 relays monitor the trip circuit only
when the circuit breaker is closed (post-closing supervision
only) while type VAX 31 and MVAXM 31 relays monitor the trip
circuit continuously (both pre-closing and post-closing supervision). Both versions detect the following conditions.
• Failure of trip supply
• Open circuit of trip coil of trip circuit wiring
• Failure of mechanism to complete the tripping operation
Type VAX 21 and MVAXM 21 relays consist of two units connected as shown in figures 1(a) and 1(b). Under healthy condition with circuit breaker closed, both units are energised. If the
trip circuit gets open or the trip supply fails, units A drops-off
Type VAX 31 and MVAXM 31 relays Under healthy conditions
with the consist of three units connected as shown in figures
2(a) and 2(b), circuit breaker closed, units A and C are energiesed and the operation is the same as that of type VAX 21
and MVAXM 21 relays. When the circuit breaker is open unit B
is also energised via the normally closed auxiliary switch of the
circuit- breaker and unit C is held-in by contact B-1 Unit B will
detect trip circuit abnormalities with the circuit breaker open in
a similar manner as unit A with the circuit breaker closed
The C unit in both the versions are delayed on drop-off by
means of RC circuit for a total time of 350 to 800 milliseconds,
to prevent a false alarm due to collage dips caused by faults in
other circuits or during a normal tripping operations, when unit
A is momentarily short circuited by the self reset tripping relay
contact. If the trip relay fails to reset possibly due to failure of
the circuit breaker tripping mechanism, the alarm is initiated
The alarm unit is designed to operate via pilot wires, if required
and opens contactA-1 to de-energise unit C. when the circuit
breaker is open the auxiliary switch of the circuit breaker shorts
contact A-1 to hold-in unit C.
2
Type VAX / MVAXM
Technical data
Coil rating
For VAX relay:
able for use with anti-corrosion negative
potential blasing device.
Operating indicator
For MVAXM relay:
Hand reset operating indicator provided
when required
24,30, 48, 50, 110/125 or 220/250 volts
dc operating band 80% - 120% of rated voltage
110/125 and 220/250 Volts dc as standard and other coil ratings are available on
request Maximum loop resistance is 400
ohms for nominal alarm supply.
Maximum loop resistance – 50 ohms for
nominal alarm supply – 24 to 50 V
Contacts
3 pairs of self reset contact one make and
two ‘break’ as standard
Operating time
Insulation
Other alarm supplies – 400 ohms
0.35 to 0.8 sec. at 80% of rated volts (between failure of trip circuit and operation
of alarm contact)
The relays meet the requirements of IS
3231/EC 255-5 Series C-2 KV for 1 minute
When rated for a 100V alarm supply the
unit ‘C’ will not operate at a current less
than 25 milliamperes. It is therefore suit-
Thermal rating
120% of rated voltage continuous
Burdens
For VAX
Maximum watts
DC Voltage
24
30
48/50
110/125
220/250
Trip supply
0.52
0.56
0.62
1.56
3.13
Alarm Supply
0.37
0.38
0.44
1.12
2.6
For MVAXM
Maximum watts
Dc voltage
110/125
220/250
Trip supply
1.56
3.13
Alarm supply
1.12
2.6
Contact ratings
Make and carry continuously Make and carry for 3 break
seconds
AC
1250VA with maximum of SA 7500VA with maxima of 30A 1250VA with maxima of 5A and
and 660 V
and 660V
660V
DC
1250 with maximum of 5A and 7500VA with maxima of 30A 100W (resistive) 50W (induc660V
and 660V
tive) with maxima of 5A and
660V
3
Type VAX / MVAXM
Dimensions and weights
For VAX relay
relay
VAX 21
VAX 31
Case Size
Maximum overall dimensions
Approximate
Height mm
Width mm
Depth* mm
Gross weight Kg.
½ N Hor.
124
153
130
1.8
1D Vert.
233
170
203
5.2
½ N Hor.
124
153
130
1.8
*Add 76 mm for maximum length of terminal studs, alternatively, 29 mm for terminal screws.
The approximate gross weights given above are inclusive of cartons, mounting appendages and terminal details.
The relays comply fully with requirements of IS 3231 and are suitable for use in normal tropical environments.
For MVAXM relay:
• MVAXM 21
Size 3 Midos
• MVAXM 31
Size 4 Midos
Information required with order
1. Type of relay (VAX 21 or VAX 31 or MVAXM 21 or MVAXM 31)
2. Coil voltage rating
Figure 1 (a) Supervision circuits with type VAX 21 relay
4
Type VAX / MVAXM
Figure 1 (b) Supervision circuits with type MVAXM 21 relay
Figure 2 (a) Supervision circuits with type VAX 31 relay
Figure 2 (b) Supervision circuits with type MVAXM 31 relay
5
INFORMATION REQUIRED
WITH ORDER
> Setting ranges
Tap setting (Is)
20%, 40% 80%, 160% In.
10%, 20%, 40%, 80% In.
5%, 10%, 20%, 40% In.
Current setting
multiplier
Relay type
CT Secondary rating
Setting range
Figure 3 : Case and panel cut-out dimensions for case 1/2N (all dimensions in mm)
Auxiliary supply voltage
1-2x tap setting
This gives effective
setting ranges of:
20 - 320% In.
10 - 160% In.
5 - 80% In.
71
26
4 holes Ø4.4
Figure 3
23.5
Case outline: size 3
168
159
Push button
projection 10 max
> Operating time
Panel cut-out:
Flush mounting fixing details
73
32
ORMATION
REQUIRED
Operate time
<10ms
HReset
ORDER
time
<15ms, typically 12ms
25 min.
212
177
157 max.
ype
rating
>ondary
Contacts
range
y supply voltage
MCTI 40
Reset
77
Flush mounting
All dimensions in mm
71
Figure 4 : Case and panel cut-out dimensions for case 1D (all dimensions in mm)
2 normally open or 1 normally
open and 1 normally closed per
phase or earth fault element
26
4 holes Ø4.4
3
52
23.5
Figure 4
Case outline: size 4
utline: size 3
> Contact ratings
168
All dimensions in mm
168
Panel cut-out:
Make and carry73 Break
Flush mounting fixing details
for 0.2s
212
7500VA32with
1250VA
with 25 min.
maxima of 30A maxima of 5A
and 300V
and 300V
157 max.
7500W with
50W (Resistive)
maxima of 30A 25W (Inductive)
Reset
and 300V
with L/R=40ms
Flush mountingwith maxima
of 5A and 300V
159
Push button
projection 10 max.
99
Panel cut-out:
Flush mounting fixing details.
32
212
157 max.
103
11
Flush mounting.
Figure 6 : Case outline: size 4
52
4 holes Ø 4.4
97
23.5
4
Figure 5
Relay type
Case size
utline: size 4
Case outline: size 6
All dimensions in mm.
MCTI 40 ALSTOM T&D
6 INDIA LIMITED
168
159
Outline drawings
are Works
shown in Figures 3, 4 and 5.
Pallavaram
19/1, G.S.T. Road,
button 043
Pallavaram, Chennai Push
- 600
99
projection 10 max.
Tel: 91-44-2264 8000
Panel cut-out:
Flush mounting fixing details.
Fax: 91-44-2264 0040
32
212
ALSTOM T&D Worldwide Contact Centre:
http://www.alstom.com/contactcentre/
Tel.: +44 (0) 1785 250177070
103. 6
4 holes ø4.4
149
All dimensions in mm.
23. 5
151
Panel cut-out:
Flush mounting fixing details.
32
25 min.
157 max.
159
168
Push button
projection 10 max.
212
25 min.
157 max.
177
GRID
www.grid.alstom.com
103
25 min.
177
Figure 5 : Case outline: size 3
> Cases
23.5
All dimensions in mm.
159
Push button
projection 10 max
Current Make and carry
continuously
AC
1250VA with
maxima of 5A
and 300V 177
DC
1250W with
maxima of 5A
77
and 300V
4 holes Ø 4.4
97
“Alstom logo and any alternative version thereof are trademarks and service marks of Alstom. The other names mentioned, registered or not, are the property of their respective companies. The technical and other data contained in
the document are provided for information only. Neither ALSTOM, its officers nor employees accept responsibility for or should be taken as making any representation or warranty (whether express or implied) as to the accuracy or
completeness of such data or the achievements of any projected performance criteria where these are indicated. No liability is accepted for any reliance placed upon the information contained in this brochure. Alstom reserves the right to
revise or change these data at any time without further notice.”
Type VAX / MVAXM
Flush mounting.
11
155
Flush mounting.
11
6