D60 Line Distance Protection System - GE D60 Instruction Manual

3 HARDWARE
Refer to the Digital elements section of chapter 5 for an example of how form-A and solid-state relay contacts can be
applied for breaker trip circuit integrity monitoring.
Relay contacts must be considered unsafe to touch when the unit is energized! If the relay
contacts need to be used for low voltage accessible applications, it is the customer's
responsibility to ensure proper insulation levels!
USE OF FORM-A AND SOLID-STATE RELAY OUTPUTS IN HIGH IMPEDANCE CIRCUITS
For form-A and solid-state relay output contacts internally equipped with a voltage measuring cIrcuit across the
NOTE
contact, the circuit has an impedance that can cause a problem when used in conjunction with external high input
impedance monitoring equipment such as modern relay test set trigger circuits. These monitoring circuits may con-
tinue to read the form-A contact as being closed after it has closed and subsequently opened, when measured as
an impedance.
The solution to this problem is to use the voltage measuring trigger input of the relay test set, and connect the form-
A contact through a voltage-dropping resistor to a DC voltage source. If the 48 V DC output of the power supply is
used as a source, a 500 Ω, 10 W resistor is appropriate. In this configuration, the voltage across either the form-A
contact or the resistor can be used to monitor the state of the output.
Wherever a tilde "~" symbol appears, substitute with the slot position of the module; wherever a number
sign "#" appears, substitute the contact number
NOTE
When current monitoring is used to seal-in the form-A and solid-state relay contact outputs, the Flex-
Logic™ operand driving the contact output should be given a reset delay of 10 ms to prevent damage of
NOTE
the output contact (in situations when the element initiating the contact output is bouncing, at values in the
region of the pickup value).
Table 3–2: CONTACT INPUT AND OUTPUT MODULE ASSIGNMENTS
~6A MODULE
TERMINAL OUTPUT OR
ASSIGNMENT INPUT
~1 Form-A
~2 Form-A
~3 Form-C
~4 Form-C
~5a, ~5c 2 Inputs
~6a, ~6c 2 Inputs
~7a, ~7c 2 Inputs
~8a, ~8c 2 Inputs
~6E MODULE
TERMINAL OUTPUT OR
ASSIGNMENT INPUT
~1 Form-C
~2 Form-C
~3 Form-C
~4 Form-C
~5a, ~5c 2 Inputs
~6a, ~6c 2 Inputs
~7a, ~7c 2 Inputs
~8a, ~8c 2 Inputs
GE Multilin
~6B MODULE
TERMINAL OUTPUT OR
ASSIGNMENT INPUT
~1 Form-A
~2 Form-A
~3 Form-C
~4 Form-C
~5 Form-C
~6 Form-C
~7a, ~7c 2 Inputs
~8a, ~8c 2 Inputs
~6F MODULE
TERMINAL OUTPUT
ASSIGNMENT
~1 Fast Form-C
~2 Fast Form-C
~3 Fast Form-C
~4 Fast Form-C
~5 Fast Form-C
~6 Fast Form-C
~7 Fast Form-C
~8 Fast Form-C

D60 Line Distance Protection System

~6C MODULE
TERMINAL OUTPUT
ASSIGNMENT
~1 Form-C
~2 Form-C
~3 Form-C
~4 Form-C
~5 Form-C
~6 Form-C
~7 Form-C
~8 Form-C
~6G MODULE
TERMINAL OUTPUT OR
ASSIGNMENT INPUT
~1 Form-A
~2 Form-A
~3 Form-A
~4 Form-A
~5a, ~5c 2 Inputs
~6a, ~6c 2 Inputs
~7a, ~7c 2 Inputs
~8a, ~8c 2 Inputs
3.2 WIRING
~6D MODULE
TERMINAL OUTPUT
ASSIGNMENT
~1a, ~1c 2 Inputs
~2a, ~2c 2 Inputs
~3a, ~3c 2 Inputs
~4a, ~4c 2 Inputs
~5a, ~5c 2 Inputs
~6a, ~6c 2 Inputs
~7a, ~7c 2 Inputs
~8a, ~8c 2 Inputs
~6H MODULE
TERMINAL OUTPUT OR
ASSIGNMENT INPUT
~1 Form-A
~2 Form-A
~3 Form-A
~4 Form-A
~5 Form-A
~6 Form-A
~7a, ~7c 2 Inputs
~8a, ~8c 2 Inputs
3-15
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