Date Code 20010719
701 Motor Protection Relay
Commissioning
Selected Functional Tests
7.11
Phase Current Measuring 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
functions or serial port
SHOW
command, note the CTR and PHROT
settings.
Step 3.
Set the current source phase angles to apply balanced three-phase
currents. Refer to
for the correct phase angles
that depend on the PHROT setting.
Step 4.
Turn on the current sources and increase the current applied to the
relay. Use the front-panel Meter Values\Instantaneous Meter function
to view the relay phase current measurements. For the applied current
values shown in
, the relay should display phase current
magnitudes equal to the applied current magnitude times the CTR
setting.
Table 7.3
Phase Current Measuring Accuracy
Table 7.3
Phase Current Measuring Accuracy
|I|
Applied
(A secondary)
Expected
Reading
(CTR • |I|
A primary)
A-Phase
Reading
(A primary)
B-Phase
Reading
(A primary)
C-Phase
Reading
(A primary)
0.5
1.0
1.5
2.0
2.5
5.0
Содержание SEL-701
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