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Dielectric Strength Ratings And Testing; Control Power - GE UR Series Instruction Manual

Line differential relay.
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3 HARDWARE
a) RATINGS
The dielectric strength of UR module hardware is shown in the following table:
Table 3–1: DIELECTRIC STRENGTH OF UR MODULE HARDWARE
MODULE
MODULE FUNCTION
TYPE
1
Power Supply
1
Power Supply
1
Power Supply
2
Reserved for Future
3
Reserved for Future
4
Reserved for Future
5
Analog I/O
6
Digital I/O
7R
L90 G.703
7T
L90 RS422
8
CT/VT
9
CPU
b) TESTING
Filter networks and transient protection clamps are used in module hardware to prevent damage caused by high peak volt-
age transients, radio frequency interference (RFI) and electromagnetic interference (EMI). These protective components
can be damaged by application of the ANSI/IEEE C37.90 specified test voltage for a period longer than the specified one
minute. For testing of dielectric strength where the test interval may exceed one minute, always observe the following pre-
cautions:
Test Precautions:
1.
The connection from ground to the Filter Ground (Terminal 8b) and Surge Ground (Terminal 8a) must be removed
before testing.
2.
Some versions of the digital I/O module have a Surge Ground connection on Terminal 8b. On these module types, this
connection must be removed before testing.
CONTROL POWER SUPPLIED TO THE RELAY MUST BE CONNECTED TO THE MATCHING POWER SUPPLY
RANGE OF THE RELAY. IF THE VOLTAGE IS APPLIED TO THE WRONG TERMINALS, DAMAGE MAY
CAUTION
OCCUR!
The power supply module can be ordered with either of two possible voltage ranges. Each range has a dedicated input
connection for proper operation. The ranges are as shown below (see the Technical Specifications section for details).
Table 3–2: CONTROL POWER VOLTAGE RANGE
RANGE
NOMINAL VOLTAGE
LO
24 to 48 V (DC only)
HI
125 to 250 V
The power supply module provides power to the relay and supplies power for dry contact input connections.
GE Power Management

3.2.2 DIELECTRIC STRENGTH RATINGS AND TESTING

TERMINALS
FROM
High (+); Low (+); (–)
48 V DC (+) and (–)
Relay Terminals
N/A
N/A
N/A
All except 8b
All (See Precaution 2)
All except 2b, 3a, 7b, 8a
All except 6a, 7b, 8a
All
All except 7b
L90 Line Differential Relay
DIELECTRIC STRENGTH
(AC)
TO
Chassis
2000 V AC for 1 min.
(See Precaution 1)
Chassis
2000 V AC for 1 min.
(See Precaution 1)
Chassis
2000 V AC for 1 min.
(See Precaution 1)
N/A
N/A
N/A
N/A
N/A
N/A
Chassis
< 50 V DC
Chassis
2000 V AC for 1 min.
Chassis
2000 V AC for 1 min.
Chassis
< 50 V DC
Chassis
2000 V AC for 1 min.
Chassis
< 50 VDC

3.2.3 CONTROL POWER

3.2 WIRING
3
3-7

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L90

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