2. Binary inputs terminal details are as under :-
Binary Inputs Terminal
S1 A15 A17
S2 A12 A14
S3 A11 A13
Remote Trip (S4) A16 A18
3. Observed binary input (S1,S2,S3) status in system data menu on LCD display
4. For Testing Remote trip input, apply rated voltage at A16 and A18 terminal. Relay will
immediately go in to tripping mode.
2.2.7 Testing for optional auxiliary power supply
The P15D is a dual power relay and can function with or without an external Auxiliary power supply.
To test this function apply rated auxiliary supply at relay terminal A (19 & 20) with proper polarity and
complete function of the relay can be tested.
It is suggested to use Numerical test kit while testing relay P15D. For timing measurements use the
optional auxiliary supply to power ON the relay.
2.2.8 Testing for trip coil
The Impulse output for Circuit Breaker Tripping coil with trip energy (12 to 24 VDC, <= 0.1 J) is
provided by a capacitor in the protection relay. The length of the pulse is 50 ms (if output is not
burdened).The pause between the individual pulses depends upon the impedance of trip coil (C.B.)
and the current level. Pulses are continued until the CB operates and fault current becomes zero.
Testing can be performed at trip coil terminal - A1 (-ve) & A3 (+ve).The trip coil output function can be
also operated by using TEST key on the relay front panel.
2.2.9 Testing for flag coil
The Impulse output for external Flag indicator with a trip energy of (12 to 24 VDC, <= 0.03 J) is
provided by a capacitor in the protection relay. The length of the pulse is 50 ms (if output is not
burdened).The pause between the individual pulses depends upon the impedance of flag indicator
and on the current level. Testing can be performed at Flag coil terminal – A2 (-ve) & A4 (+ve).
2.2.10 Functional test
2.2.10.1 Testing of Overcurrent Protection
1. Overcurrent I>1 function: Pickup test
I>1 Setting R Phase Y Phase B Phase Limit value (amp)
1A 5A 1A 5A 1A 5A 1A 5A
Min Max Min Max
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