Table of Contents
Advertisement
7.8.
BREAKER FAILURE AND 50 UNITS TEST
This test should be done for each one of the positions and both bus bars.
Check that the stabilization resistors are shortened.
Set the adjustment 50 of the position to 100% and BF to 0.9 A and the time of B.F. to 0.4 s, that is first step
100ms (all switches on SFI module should be on the left), second step 300ms (switches on DTE module,
common for all positions).
Set up the latching relay of bus A (89AX/P) to the ON position (see table 2: Bar connection & disconnection)
that of bus B (89BX/P) in the OFF position (see table 2: Bar connection & disconnection), put a jumper
between terminals (see table 6: Compound blocking contacts), initiate the breaker failure protection by
applying +P to the terminal (see table 4: Breaker failure initiation) of this position and apply 0.9 A of current
through the corresponding terminals of this position (see table 1: Input current) and checking that:
• The differential does not trip;
• The 50 trips with 0.9 A;
• The B.F. trips with 0.9 A and at 0.4 s;
• When testing bar A check that there is voltage in X5 (+P) after 100ms (first step) and in X9 after 300ms
(second step).
• When testing bar B check that there is voltage in X6 (+P) after 100ms (first step) and in X10 after 300ms
(second step).
• Both LEDs are red;
• Contacts X25-X26 and X27-X28 are closed for Bar A and contacts X37-X38 and X39-X40 are closed for
Bar B.
• the restraint measured in the corresponding terminal of the differential module is 0.9;
• contacts (see table 3: breaker failure tripping output contacts) of the position are closed;
Apply the same current through phase 2 (see table 1) and phase 3 (see phase 1).
Disconnect the latching relay of bus A (89AX/P) of the position tested, applying +P to terminal (see table 2:
Bar connection & disconnection) of the position. Connect the latching relay of bus B (89BX/P) to the
position, applying positive +P to terminal (see table 2: Bar connection & disconnection) of the position.
Set the line latching relays of the next position and repeat the whole process for every position. Repeat the
above steps for bar B.
TABLE 2: BAR CONNECTION & DISCONNECTION FOR ALL POSITIONS
GEK-98514B
TABLE 1: INPUT CURRENT FOR ALL POSITIONS
Phase A
Phase B
23-26
24-26
BAR A
ON
OFF
12
13
BUS1000 Busbar Protection
Phase C
25-26
BAR B
ON
OFF
14
15
7. ACCEPTANCE TESTS
7-7
Advertisement
Table of Contents
