Control Power; Trip And Close Output Relays - GE Multilin 350 Series Instruction Manual

CHAPTER 2: INSTALLATION

2.2.6 Control power

CAUTION:
CAUTION
CAUTION:
CAUTION
CAUTION:
CAUTION
NOTE:
NOTE

2.2.7 Trip and Close output relays

350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
Courtesy of NationalSwitchgear.com
Control power supplied to the relay must match the installed power supply range. If the
applied voltage does not match, damage to the unit may occur. All grounds MUST be
connected for safe, normal operation regardless of control power supply type.
The label found on the relay specifies its order code or model number. The installed power
supply's operating range will be one of the following:
LO: 24 to 48 V DC (Range: 20 to 60 V DC)
HI: 125 to 250 V DC/120 to 240 V AC (Range: 84 to 250 V DC/66 to 265 V AC)
The relay should be connected directly to the ground bus, using the shortest practical
path. A tinned copper, braided, shielding and bonding cable should be used. As a
minimum, 96 strands of number 34 AWG should be used. Belden catalog number 8660
is suitable.
Isolate power prior to servicing.
An external switch, circuit breaker, or other protective device must be connected near to
the equipment.
Figure 2-10: Control power connection
+
CONTROL
P P OWER
-
HEAVY COPPER CONDUCTOR HEAVY COPPER CONDUCTOR
OR BRAIDED WIRE OR BRAIDED WIRE
SWITCHGEAR
GROUND BUS GROUND BUS
The 350 relay is equipped with seven electromechanical output relays: two special relays
designed for Breaker trip and close (Relay 1 "Trip", Relay 2 "Close"), four general purpose
relays (Auxiliary Relays 3 to 6), and a Critical Failure relay. The special purpose relays have
fixed operating characteristics and the general purpose relays can be configured by the
user.
Operation of the Trip and Close output relays is designed to be controlled by the state of
the circuit breaker as monitored by a 52a or 52b contact.
• The Trip and Close relays reset after the breaker is detected in a state corresponding
to the command. When a relay feature sends a command to one of these special
relays, it will remain operational until the requested change of breaker state is
confirmed by a breaker auxiliary contact and the initiating condition has reset.
B2 A1 B1
- +
CONTROL
POWER
ELECTRICAL INSTALLATION
RELAY
898735.CDR 898735.CDR
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