1 GRID PROTECTION Type VAJ relays are fast operating multi-contact attracted armature relays with a high degree of mechanical stability and are suitable for control duties where a number of simultaneous switching operations are required. Control relays generally have lower burdens than tripping relays and are used for applications such as starting and shutting down apparatus in automatic stations. The mechanical construction ranges from a basic attracted armature unit to more complex arrangements employing several mechanically linked contact stacks and heavy duty armature assembly. Cut-off contacts are provided on electrically reset relays. The contacts are time delayed on opening, and after a short time delay cut off the operating current. Standard voltage ratings Operating and reset coils : 24, 30, 48, 110, 125, 220, 230, 240 and 250 volts d.c. Satisfactory operation and reset is between 80% and 120% of rated voltage. Contacts The number of pairs of contacts available for tripping of contacts available are shown in the table. Any combination of normally open or normally closed contacts can be fitted. Contacts are of silver/copper alloy, shaped and positioned to ensure low resistance and maximum reliability. Customer Benefits • Electrical Reset • High Reliabiltiy • High speed operation CONTROL RELAY VAJC Cut-off Contacts The electrically reset relays are fitted with heavy duty cut-off contacts. These contacts interrupt the operating circuit instantaneoulsy when the relay has operated and latched in, to reduce relay burden and possible heating effect.
4
Embed
CONTROL RELAY - Switchgear and Protection, Modular ... CONTROL RELAY VAJ… · CONTROL RELAY. VAJC. Cut-off Contacts. The electrically. reset relays are fitted with heavy duty cut-off
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
1
GRID
PROTECTION
Type VAJ relays are fast operating multi-contact attracted armature relays with a high degree of mechanical stability and are suitable for control duties where a number of simultaneous switching operations are required.
Control relays generally have lower burdens than tripping relays and are used for applications such as starting and shutting down apparatus in automatic stations.
The mechanical construction ranges from a basic attracted armature unit to more complex arrangements employing several mechanically linked contact stacks and heavy duty armature assembly.
Cut-off contacts are provided on electrically reset relays. The contacts are time delayed on opening, and after a short time delay cut off the operating current.
Standard voltage ratings
Operating and reset coils : 24, 30, 48, 110, 125, 220, 230, 240 and 250 volts d.c.
Satisfactory operation and reset is between 80% and 120% of rated voltage.
Contacts
The number of pairs of contacts available for tripping of contacts available are shown in the table. Any combination of normally open or normally closed contacts can be fitted. Contacts are of silver/copper alloy, shaped and positioned to ensure low resistance and maximum reliability.
Customer Benefits
• Electrical Reset• High Reliabiltiy• High speed operation
CONTROL RELAYVAJC
Cut-off Contacts
The electrically reset relays are fitted with heavy duty cut-off contacts. These contacts interrupt the operating circuit instantaneoulsy when the relay has operated and latched in, to reduce relay burden and possible heating effect.
124153
2
VAJC
Contacts Ratings
Make and carrycontinously
MAKE AND CARRYFOR 0.5 SECOND
Break
AC 1250 VA with maximaof 5A and 660V
7500 VA with maxima of30A and 660V
1250 VA with maximaof 5A and 660V
DC 1200W with maxima of5A and 660V
7500W with maxima of30A and 660V
100W resistive , 50Winductive with maximaof 5A and 660V
Operating time and burdens
RELAYTYPE
NOMINALOPERATING
BURDEN(In Watts )
MAXIMUMBURDEN
OPERATED(In Watts )
NOMINALRESET COIL
BURDEN(In Watts )
MAXIMUMOPERATING TIME(In milliseconds)
VAJC 11 20 0 20 25
RELAY TYPE PAIRS OF CONTACTS CONTACT RESET DUTYVAJC11 8 Electrical Control
Thermal rating
The control relays are arranged so that 120% rated voltage can be applied continuously. Reset coils, which are normally energised through a push button, are short time rated.
NUMBER OFPAIRS OFCONTACTS
CASE SIZEAND TYPE
MAXIMUM OVERALLDIMENSIONS (mm)
MAXIMUMNUMBER OFTERMINALSHeight
mmWidthmm
Depth*mm
8 1/2 N 152 20
8 1D 237 179 218 20
Figure 1 : Case and panel cut-out dimensions for case 1/2 N Ver. (all dimensions in mm)
3
Dimension Details
VAJC
Cases are suitable for flush or projecting mounting. All cases are finished phenolic black as standard. Standard relays are finished to B.S.2011: 20/40/4 and are satisfactory for normal tropical use. Relays for use in exceptionally severe environments can be finished to B.S.2011:20/50/56 at extra cost.
Figure 2 : Case and panel cut-out dimensions for case 1D (all dimensions in mm)
4
GRID
Relay Type: VAJC
Contacts:
8 Pair Contacts 11
Case:
1/2N V Non-Drawout Case ZF
1D V Drawout Case with CT shorting links BF
Auxiliary Voltage:
24/27 Vdc 000
30/34 Vdc 025
48/54 Vdc 050
110/125 Vdc 075
220/250 Vdc 100
Contact Combination:
8 N/O 0
7 N/O 1N/C 1
6 N/O 2 N/C 2
5 N/O 3 N/C 3
4 N/O 4 N/C 4
Burden
Low Burden A
Flag Option:
With flag B
Issue:
Factory Defined A
Information required with your order.
VAJC
ALSTOM T&D INDIA LIMITEDPallavaram Works19/1, G.S.T. Road,Pallavaram, Chennai - 600 043Tel: 91-44-2264 8000Fax: 91-44-2264 0040