Basler Electric BE1-87T - Manual (Page 115)

9171300990 Rev V BE1-87T Test Procedures 5-19
Operational Test Procedures
The functional tests given below provide a simplified method of checking the relay trip performance
relative to the front panel settings, and indirectly, the calibration. Individual steps of the procedure are
designed as a series of tests that are performed in the sequence shown (rather than stand alone). For a
more comprehensive test, refer to Verification Tests: 5 Amp CT or Verification Tests: 1 Amp CT earlier in
this section.
CAUTION
Do not proceed unless familiar with the Relay Operating Precautions, the
procedures described in Relay Disassembly and the procedures listed in the
Restrained Pickup Testing Examples at the beginning of this section.
These tests may be performed by removing the BE1-87T to a test station or with the relay installed.
CAUTION
If testing an installed relay, be sure to isolate the current inputs and the relay
outputs from the system. Basler electric test plugs (p/n 10095) are
recommended for this purpose to isolate the relay as well as simplify the test
setup. (For further information, see Test Plug in Section 4, Installation).
Restrained Pickup
NOTE
When making restrained pickup tests, always decrease one current starting
from a balanced input. Since percentage restraint is derived from the
maximum current at any one input, an increase of any current increases
restraint. By contrast, a decrease of one current has no effect on restraint.
Step 1. Connect the relay as appropriate (refer to Figures 5-1 through 5-4). Apply the tap value to Input
1 and to Input 2.
Step 2. With Input 1 constant, decrease Input 2 until the REST. TRIP LED lights. Ensure that this
measurement is within ±6% of the calculated current. Return Input 2 to tap value.
Step 3. With Input 2 constant, decrease Input 1 until the REST. TRIP LED lights. Ensure that this
measurement is within ±6% of the calculated current. Return Input 1 to tap value.
Unrestrained Pickup
Step 4. Set the front panel UNREST PICKUP LEVEL switch to the desired multiple of the tap setting
( X TAP) which is the pickup level.
Step 5. Increase the input test current until the UNREST. TRIP LED lights. Ensure that this
measurement is within ±3% of calculated pickup. Do NOT
Second-Harmonic Inhibit
exceed the thermal rating!
Step 6. For 50 and 60 Hz Units: Apply tap value (1 pu) to Input 1. The REST. TRIP LED should be
illuminated.
For Three-Phase Units: Set CALIBRATE switch S2 to CAL Position (see Figure 2-4).