Trip Level Test - GE Multilin DBT Instruction Manual

7.3 TRIP LEVEL TEST

Connect the relay as indicated in the external connections diagram (Figs. 2 & 3), using a DC power supply (110/125
or 220/250 V) for the auxiliary voltage (terminals B9-B10), according to the model. Variations of ±20% are admitted (-
20% of the minimum and +20% of the maximum). For breaker power supply (terminals B1-B2) a second variable
DC power supply is needed.
Apply different voltages and check that the undervoltage LED flashes (pick-up) with the pick-up 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 ellapses, the LED stop flashing and is lit permanently (fault memory function). It
is recommended to set the time to the minimum in order to ease the test.
VOLTAGE
setting (V)
50
55
60
70
90
125
20
110/125 model
Pick-up Drop-out
voltage (V) voltage (V)
(voltage (voltage ok)
failure)
45 55
50 60
55 65
65 75
85 95
118 133
DBT Digital Trip Coil Supervision Relay
RECEPTION TESTS
VOLTAGE
setting (V)
100
110
120
140
180
250
220/250 model
Pick-up Drop-out
voltage (V) voltage (V)
(voltage (voltage ok)
failure)
90 110
100 120
110 130
130 150
170 190
236 264
GEK-105597C