701 Motor Protection Relay Date Code 20010719
Commissioning
Selected Functional Tests
7.12
Neutral Current Measuring Accuracy
Step 1. Connect one current source to the IN current input (5 A or 1 A, as
indicated by the INTAP setting) to test neutral current measuring
accuracy.
Step 2. Using the front-panel Set Relay\Relay Elements\General Data
functions or serial port SHOW command, note the CTRN setting.
Step 3. Turn on the current source and increase the current applied to the
relay. Use the front-panel Meter Values\Instantaneous Meter function
to view the relay neutral current measurement. For the applied current
values shown in Ta ble 7.4, the relay should display neutral current
magnitudes equal to the applied current magnitude times the CTRN
setting.
Table 7.4 Neu tral Current Mea su ring Accuracy
Current Unbalance Element Accuracy
Step 1. Connect the current sources to the IA, IB, and IC current inputs
(5 A or 1 A, as indicated by the ITAP setting).
Step 2. Using the front-panel Set Relay\Relay Elements\General Data and
Set Relay\Relay Elements\Thermal Model Elements functions or
serial port SHOW command, note the CTR, PHROT, and FLA
settings.
Table 7.4 Neutral Current Measuring Accuracy
|I| Applied
(A secondary)
Expected Reading
(CTRN • |I| A primary)
IN Reading
(A primary)
0.05 • INTAP
0.10 • INTAP
0.25 • INTAP
0.50 • INTAP
1.00 • INTAP
2.00 • INTAP
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