Cut Sheet

Page 33
SE-330HV Neutral-Grounding-Resistor Monitor Rev. 5-I-091115
9.4 GROUND-FAULT PERFORMANCE TEST
To meet the requirements of the National Electrical
Code (NEC), as applicable, the overall ground-fault
protection system requires a performance test when first
installed. A written record of the performance test is to be
retained by those in charge of the electrical installation in
order to make it available to the authority having
jurisdiction. A test-record form is provided for recording
the date and the final results of the performance tests.
The following ground-fault system tests are to be
conducted by qualified personnel:
a) Evaluate the interconnected system in accordance with
the overall equipment manufacturer’s detailed
instructions.
b) Verify proper installation of the ground-fault current
sensor. Ensure the cables pass through the ground-
fault-current-sensor window. This check can be done
visually with knowledge of the circuit. The
connection of the current-sensor secondary to the
SE-330HV is not polarity sensitive.
c) Verify that the system is correctly grounded and that
alternate ground paths do not exist that bypass the
current sensor. High-voltage testers and resistance
bridges can be used to determine the existence of
alternate ground paths.
d) Verify proper reaction of the circuit-interrupting
device in response to a simulated or controlled ground-
fault current. To simulate ground-fault current, use
CT-primary current injection (does not apply for
bushing-type CT’s). Fig. 21 shows a test circuit using
an SE-400 Ground-Fault-Relay Test Unit. The SE-
400 has a programmable output of 0.5 to 9.9 A for a
duration of 0.1 to 9.9 seconds. Set the test current to
120% of GF TRIP LEVEL. Inject the test current
through the current-sensor window for at least 2.5
seconds. Verify that the circuit under test has reacted
properly. Correct any problems and re-test until the
proper reaction is verified.
e) Record the date and the results of the test on the
attached test-record form.
N
OTE: Do not inject test current directly into CT-input
terminals 8, 9, 10, and 11.
N
OTE: For accurate trip-time measurement, the fault
current should not be re-applied for the time defined by the
GF TRIP TIME setting to allow the trip accumulator to
initialize.
NEUTRAL
TO SE-330HV
TO SENSING
RESISTOR
TERMINAL N
NGR
11
12
OP1
OP2
3
L
L1
5
N
L2
1
SE-400
REMOTE
INPUT
8
9
RMT1
RMT2
NOTE 1
NOTE:
1. USE MULTIPLE WRAPS FOR TEST CURRENTS > 9.9 A.
FIGURE 21. Ground-Fault-Test Circuit.
TABLE 3. G
ROUND-FAULT-TEST RECORD
D
ATE TEST RESULTS
Retain this record for the authority having jurisdiction.