Startco SE-704, Руководство пользователя

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Startco Engineering Ltd. Page 11
SE-704 Earth-Leakage Monitor Rev. 0
Pub. SE-704-M, January 18, 2008.
8. P
ERFORMANCE
T
EST
Some jurisdictions require periodic earth-fault
performance tests. A test record form is provided for
recording the date and the result of the performance
tests. The following earth-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 location of the SE-CS30 current
sensor. Ensure the cables pass through the current-
sensor window. This check can be done visually
with knowledge of the circuit. The connection of the
current-sensor secondary to the SE-704 is not polarity
sensitive.
c) Verify that the system is correctly earthed and that
alternate earth paths do not exist that bypass the
current sensor. High-voltage testers and resistance
bridges can be used to determine the existence of
alternate earth paths.
d) Verify proper reaction of the circuit-interrupting
device in response to a simulated or controlled earth-
fault current. To simulate earth-fault current, use CT-
primary current injection. Fig. 7 shows a test circuit
using a Startco 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. Fig. 7
shows the use of resistors that reduce the injected
current to 10% of the SE-400 setting. Set the test
current to 120% of the SE-704 setting. 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.
NOTE: Do not inject test current directly into current-
sensor-input terminals 4 and 5.
SE-400
SE-704
RMT1
REMOTE
TEST 9
8
1
5
3
11 12
RMT2
L
L
N
N
L1
L1
OP1 OP2
L2
L2/N
FROM
POWER
SOURCE
LOAD
S1 S2
4 5
SE-CS30
11
10
R1
R2
R1 = 10 , 10 W, 1%
R2 = 0.1 , 10 W, 1%
I = 1/10 SE-400 SETTING
W
W
TEST
I
TEST
FIGURE 7. Earth-Fault-Test Circuit.
TABLE 2. E
ARTH-
F
AULT-
T
EST
R
ECORD
D
ATE
T
EST
R
ESULTS
Retain this record for the authority having jurisdiction.