Date Code 20010731
Testing and Troubleshooting
11-11
SEL-352-1, -2 Instruction Manual
equation. Find the deassertion of the 87H and the assertion of the 86BFT.
The difference between the two time stamps should correspond to the
Ffpu timer setting plus any delay in the assertion of the current and pickup
of the 50LD element.
This checkout procedure demonstrates only a few relay features. For a complete understanding
of relay capabilities, study the functional description in
Section 5: Control Logic
. For more test
procedures, see the
Full Functional Test
portion of this section.
F
ULL
F
UNCTIONAL
T
EST
This procedure tests relay protective and control functions more fully than the initial checkout
procedure.
Equipment Required
The following equipment is necessary to complete a full functional test:
1. A terminal or computer with terminal emulation with EIA-232 serial interface
2. Interconnecting data cable between terminal and relay
3. Source of relay control power
4. Source of synchronized three-phase voltages and at least two currents
5. Ohmmeter or contact opening/closing sensing device
6. Timer with contact inputs for start and stop
What Should Be Tested
A full functional test includes the initial checkout procedure and the additional steps described
below. In general, these tests assure that the relay settings match your application rather than
checking relay performance. For commissioning purposes, your company policy may require
you to perform the full functional test. For maintenance purposes, a quick test of selected relay
functions should suffice. For example, test operation of the Failure to Trip for Fault Current
logic, each relay contact input, and each contact output.
S
ETTING
T
EST
Purpose: Verify that the relay accepts settings.
Method: 1. Gain Level 2 Access (see
ACCESS
and
2ACCESS
commands in
Section 8:
Serial Port Communications and Commands
).
2. Change one setting. For example, change the 47Q pickup setting. Type
SET 47Q
TERSE
and press
<ENTER>
. The “TERSE” parameter instructs the SEL-352
Relay to immediately prompt “Save Changes?” following an entry of “END.”
Following the 47Q prompt, type the new setting and press
<ENTER>
.
3. To complete the setting procedure, type
END
and press
<ENTER>
. Type
Y
<ENTER>
at the prompt: Save Changes ?
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