Basler Electric BE1-87T - Manual (Page 97)

9171300990 Rev V BE1-87T Test Procedures 5-1
SECTION 5 • TEST PROCEDURES
Overview
BE1-87T Transformer Differential Relays are calibrated and tested for correct operation at the factory and
all calibration pots are sealed.
Immediately upon receipt of the relay, or after extended service, it is recommended that the
Verification
Tests provided in this section be performed. These comprehensive tests verify all operating parameters
including calibration.
BE1-87T relay
Verification Tests are divided into two groups based on the current CT ampere rating and
the nominal operating frequency: (See the first position of the Style Number and the Sensing Input Range
Option as shown in Figure 1-1.)
Five Amperes CT, 60 Hz Units (Range 1) and Five Amperes CT, 50 Hz Units (Range 3)
One Ampere CT, 60 Hz Units (Range 4) and One Ampere CT, 50 Hz Units (Range 2)
Within each group are separate tests that can be performed individually to make it easier to focus on a
particular problem. However, all of these tests should be performed prior to putting the relay into service.
To help field users understand the verification procedures, four examples for restrained pickup testing are
provided before the actual Verification Tests begin . Two examples are for increasing one input from
balance and two examples are for decreasing one input from balance. These examples are not a
necessary part of verification testing, but are provided for clarification.
For routine assurance that the BE1-87T is operating correctly, the simplified
OPERATIONAL TESTS may
be performed.
Before starting a test program, check the Style Number of the relay against the Style Number
Identification Chart, Figure 1-1, to identify the specific features and options to be tested. For location of
the switches and controls, refer to Figures 2-1 and 2-2 for Input Range 1 or 3, and Figures 2-3 and 2-4 for
Input Range 2 or 4.
NOTE
LEDs and targets (if provided) should be checked for proper operation and
targets reset after they have been tripped. Current-operated (Type D) targets
will only operate when a minimum of 0.2 A is present in the trip circuit.
Similarly, the auxiliary contacts (if present) should be checked for proper
operation. Switches S1 and S2, located on the mother board and shown in
Figure 2-4 allow the auxiliary output to operate in conjunction with a restrained
trip, an unrestrained trip, or both.
Equipment Required
The following test equipment (or equivalent) is required for either the Operational Tests or the
Verification Tests:
1. Two current sources with independently regulated current outputs. Must be able to produce
outputs 180° out of phase. If harmonic testing is desired, harmonic capability is also required.
2. Counter, 0 to 0.5 second range.
3. Two Test Plugs, Basler p/n 10095 (see Test Plug in Section 4, Installation).
4. Phase angle meter or oscilloscope with an ungrounded plug or ground isolation transformer.