7-10 Maintenance and Testing Date Code 20000421
SEL-251, -2, -3 Instruction Manual
R0 = 1.44
X0 = 4.56
RS = 0
XS = 0
LL = 2.42
Set one of the phase pickups (51P, 50L, or 50H) below 10.00 A secondary and
enable this same pickup to generate an event report [ER(1246) setting]. Remember
that the line length (LL) setting is unitless.
Table 7.1: Fault Locator Test Values
LOCATION TYPE
VA
VB VC IA IB IC UNITS
7.26 AG 56.49 66.33 67.88 10.60 0.00 0.00 V or A
-2.5 -116.9 116.3 -73.5 0.00 0.00 Degrees
7.26 BC 69.28 55.09 50.29 0.00 12.38 12.38 V or A
0.00 -134.0 128.1 0.00 -164.2 15.81 Degrees
To view the full event report for the last fault, type EVENT 1 and press <ENTER>.
Each event report provides an eleven cycle record of the currents, voltages, relay
element states, and all contact input and output states. The relay saves the twelve
newest reports.
This checkout procedure demonstrates only a few relay features. For a complete
understanding of relay capabilities, study Functional Description in Section 2:
Specifications, the Command Descriptions in Section 3: Communications, and
Section 4: Event Reporting. For more test procedures, see the Full Functional
Test portion of this section.
FULL FUNCTIONAL TEST
This procedure allows you to test the protective and control functions of the relay more fully than
the initial checkout procedure does.
Equipment Required
The following equipment is necessary to complete a full functional test:
1. Communications terminal with EIA-232 serial interface
2. Data cable to connect 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
7. Plug-in mating connectors/wiring harness (Plug-In Connector model only)
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