Schweitzer Engineering Laboratories SEL-352-1 - Differential Voltage Element Tests; Synchronism Checking Element Tests

11-16 Testing and Troubleshooting Date Code 20010731
SEL-352-1, -2 Instruction Manual
4. Verify the results with the indicated setting. The target LED should pick up when
10 V
• I = 37OP setting. Test each phase element in this manner. You may wish
to test the elements at various values of input voltage as well, but this is not
required.
DIFFERENTIAL VOLTAGE ELEMENT TESTS
Purpose: Verify the pickup thresholds of the differential voltage elements.
Method: 1. This test requires applying voltage to only one set of voltage inputs. Remove the
parallel jumpers for the voltage inputs. These jumpers are shown in Figure 11.3
and Figure 11.4 as dotted lines.
2. Using the TARGET F command with the element name, set the bottom row of
the front-panel target LEDs to display the appropriate differential voltage element.
Select one or more of the phase voltage elements from the Relay Word as
indicated below. Many of the elements appear in the same Relay Word row, so
they can be monitored simultaneously.
Setting
Elements
87FO 87F, 87FOA, 87FOB, 87FOC
87TH 87TH, 87THA, 87THB, 87THC
87H 87H, 87HA, 87HB, 87HC
3. Apply voltage to one phase and observe the pickup and dropout of each element.
Record the results. The elements without a phase indication assert when any phase
is asserted.
Verify the results with the indicated setting.
SYNCHRONISM CHECKING ELEMENT TESTS
Purpose: Verify the pickup thresholds of the synchronism checking elements for angle and slip
conditions (Reference: Figure 4.4).
Method: 1. This test requires two separate single-phase voltage sources, one connected to
A-phase input of the X voltages (terminals: Z13 and Z16) and one connected to
A-phase of the Y voltages (terminals: Z19 and Z22).
The sources must have the ability to vary the angle of the voltage for the first half
of the test and the ability to vary the frequency the second half of the test.
2. Using the TARGET F command with the element name, set the bottom row of
the front-panel target LEDs to display the appropriate synchronism checking
element. Select one of the phase voltage elements from the Relay Word as
indicated below: