Schweitzer Engineering Laboratories SEL-701-1, Instruction Manual

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SEL-701-1 Monitor
Date Code 20011009
Commissioning
Selected Functional Tests
6.12
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 Monitor\Monitor 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
monitor. Use the front-panel Meter Values\Instantaneous Meter
function to view the monitor neutral current measurement. For the
applied current values shown in
Table 6.4 , the monitor should display
neutral current magnitudes equal to the applied current magnitude
times the CTRN setting.
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 Monitor\Monitor Elements\General Data
and Set Monitor\Monitor Elements\Thermal Model Elements
functions or serial port
SHOW command, note the CTR, PHROT,
and FLA settings.
Table 6.4 Neutral Current Measuring Accuracy
|I| Applied
(A secondary)
Expected Reading
(CTRN o |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