Testing 7-1
SECTION 7
•
••
•
TESTING
GENERAL
This Section provides a simple test procedure for testing BE3-GPR relays.
EQUIPMENT REQUIRED
•
Personal computer with RS-232-C serial link and running a terminal emulator program.
•
DC Power Supply: 12-24 VDC adjustable, 0.5A.
•
Three-Phase line-to-neutral AC Voltage Source, 50-70 Hz adjustable, 0-120 V
RMS
line-to-neutral
adjustable.
•
A 60 Hz, single or three-phase, AC Current Source, with a current adjustable range of 0 to 2
ampere RMS and the voltage-current phase relationship phase adjustable.
•
Digital Voltmeter 4 1/2 digits (Fluke 8050A or equivalent).
•
Continuity Tester.
•
Toggle Switch, SPST sufficient.
•
Hardware Jumpers.
Test Setup
Step 1. Set the DC Power Supply to 12 Vdc and connect to the relay Batt + input (terminal 70) and the
Batt - input (terminal 69).
Step 2 Install a jumper across the PROGRM ENABLE input (terminals 6 and 7) to enable relay front
panel programming. The jumper should remain installed for all tests unless noted otherwise.
Step 3 Connect the 3-phase AC voltage source to the GEN inputs as follows: terminal 26 = phase A
terminal 24 = phase B, terminal 22 = phase C and terminal 20 = neutral. Adjust the frequency
to 60 Hz and set the voltage to 69.3 V
RMS
line-to-neutral (120 V
RMS
line-to-line).
Step 4. For (NGF) Connect the AC Current source to the 5A NGF CT input (terminal 33) and CT
COM input (terminal 35). Leave current set to 0 Amps for now.
For (TOC) Connect the AC Current source to the 5A A, B, or C CT input (terminals 29, 31,
or 33) and CT COM input (terminal 35). Leave current set to 0 Amps for now.
Protective Functions
The following subsections are designed to efficiently check the hardware/software operation for each of
the individual protective functions, using a step application and removal of a known fault level, specifically
to test output contact operation and NOT relay accuracy. For each subsection a continuity tester should
be used to monitor that the specified contacts close upon trip application and open upon removal.
Overvoltage Trip (Line-To-Neutral Voltage Sensing)
Step 1. Monitor the OVR VOLT output contacts, terminals 37 and 38, for the trip condition.
Step 2. Increase phase A, line-to-neutral voltage from 69.3 V
RMS
to 100 V
RMS
. The relay should be
flashing the overvoltage tripped condition on the front panel LCD. Return the voltage to 69.3
V
RMS
and the LCD and contacts should return to the un-tripped ON display.
Step 3. Increase phase B, line-to-neutral voltage from 69.3 V
RMS
to 100 V
RMS
. The relay should be
flashing the overvoltage tripped condition on the front panel LCD. Return the voltage to 69.3
V
RMS
and the LCD and contacts should return to the un-tripped ON display.
Step 4. Increase phase C, line-to-neutral voltage from 69.3 V
RMS
to 100 V
RMS
. The relay should be
flashing the overvoltage tripped condition on the front panel LCD. Return the voltage to 69.3
V
RMS
and the LCD and contacts should return to the un-tripped ON display.
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