Testing; Primary Injection Testing; Secondary Injection Testing; Phase Current Input Functions - GE MULTILIN 269 MOTOR MANAGEMENT RELAY Series Instruction Manual

4 RELAY TESTING

4.1 Primary Injection Testing

Prior to relay commissioning at an installation, com-
plete system operation can be verified by injecting cur-
rent through the phase and ground fault CTs. To do
this a primary (high current) injection test set is re-
quired.
Operation of the entire relay system, except the phase
CTs, can be checked by applying input signals to the
269 relay from a secondary injection test set as de-
scribed in the following sections.
"Multiamp" or "Doble" test equipment can be used
to do current and timing tests.

4.2 Secondary Injection Testing

Single phase secondary injection testing can be per-
formed using the test set up shown in figure 4-1. Tests
should be performed to verify correct operation of relay
input (A/D), output, memory, and RTD circuitry. 269
relay functions are firmware driven and thus testing is
required only to verify correct firmware/hardware inter-
action.
All tests described in the following sections will be ap-
plicable with factory setpoints and configurations left
unchanged. Similar tests can be performed after new
setpoints have been stored in the 269 relay.

4.3 Phase Current Input Functions

All phase current functions use digital current informa-
tion converted from the analog phase CT inputs.
Functions that use phase current readings are over-
load, unbalance, short circuit, and rapid trip. The 269
must read the injected phase currents correctly in order
for these functions to operate properly. To determine if
the relay is reading the proper current values inject a
phase current into the relay and view the three current
readings in ACTUAL VALUES mode, page 1. With
factory setpoints stored in the relay the displayed cur-
rent should be:
displayed current = actual injected current × 100/5
(phase CT ratio)
Various trip and alarm conditions can be simulated by
adjusting the injected phase currents. All trip/alarm
conditions using phase current readings will operate as
described in Section 3 providing the 269 relay reads the
correct phase current.
4-1