Trip circuit supervision relay is tested with variable DC power supply,
Variable Resistance, one Push button with set of NO + NC contacts and
Electronic Timer.
. Connect correct polarity/rating of DC Voltage to Relay (terminal # B9 &
B10). Press the “Target Reset” button and check that all target LEDs
lights up.
. UNDER VOLTAGE TEST
. Connect Variable DC power supply to Relay Breaker Voltage inputs:
teminal B1 (+ve) & B2 (-ve).
. Set the time to minimum in order to ease the test.
. Short all the Relay Trip coil monitoring inputs.
. Apply different Voltages and check that the undervoltage LED flashes
pick –up) with voltage (see table below). The LED remains
flashing, until the undervoltage condition disappears (drop out voltage).
When the drop-out voltage is reached, and the set time elapses, the LED
stop flashing and is lit permanently (fault memory function).
VOLTAGE SETTING
|
PICK-UP
VOLTAGE
(VOLTAGE
FAILURE)
|
DROP-OUT
VOLTAGE
(VOLTAGEOK)
|
50V
|
45V
|
55V
|
55V
|
50V
|
60V
|
60V
|
55V
|
65V
|
70V
|
65V
|
75V
|
90V
|
85V
|
95V
|
125V
|
118V
|
133V
|
. TIME
DELAY TEST
. Connect 125VDC supply to Relay Breaker Voltage inputs:
terminal B1 (+ve)
& B2 (-ve).
. Connect the Push button NC contacts to
Relay Trip coil # 1 monitoring input
(terminal # B3) & Breaker Voltage input
(terminal # B2).
. Connect the Breaker circuit OK “NO”
output contacts to stop the timer.
. Set the Time Delay according to the
table given below: and check that the results in the table are complied with.
Repeat the test using coil # 2 & 31/P’s.
TIME
DELAY
SETTING
|
MINIMUM
OPERATING TIME
|
MAXIMUM
OPERATING TIME
|
DROP-OUT TIME
(OUTPUT RELAY)
|
200ms
|
200ms
|
240ms
|
|
400ms
|
400ms
|
440ms
|
|
600ms
|
600ms
|
640ms
|
|
1
s
|
1
s
|
1.04
s
|
100
– 150ms
|
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