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Note : Be sure to restore these switches after the tests are completed or three-terminal normal
operation resumes. In normal operation, the switch [A.M.F] is set to "1" (=On) and other
switches to "0" (=Off). In other situation, the red "TESTING" LED is lit for alarming.
IECTST
•
Enter 1(=On) for [IECTST] to transmit 'test mode' to the control system by IEC60870-5-103
communication when testing the local relay, and press the ENTER key.
• Press the END key to return to the "Test" screen.
THMRST
The switch [THMRST] is used to perform the thermal overload element test because the
resetting time is in the order of minutes. The thermal overload element is instantaneously reset
when the [THMRST] is ON.
• Enter 1(=On) for testing the thermal overload element, and press the
• Press the END key to return to the "Test" screen.
Z1S-1PH
When a three-phase voltage source is not available, the distance measuring element operation
can be tested using a single-phase voltage source by setting the switch [Z1S-1PH] to "On". This
is not fit for the high-accuracy test, though. Then, press the
• Press the END key to return to the "Test" screen.
ZB-CTRL
The switch [ZB-CTRL] is used to test the Z1 characteristic with offset or not. When the switch
[ZB-CTRL] is set to "1", the Z1 is an offset characteristic. When the switch [ZB-CTRL] is set to
"2", the Z1 is a characteristic without offset. Then, press the
• Press the END key to return to the "Test" screen.
X
(a) Mho characteristic
Figure 4.2.7.1 Z1 Characteristics by [ZB-CTRL] Setting
XANGLE
The gradient characteristic of Zone 1 reactance elements is obtained only when the load current
is transmitted from local to remote terminal. So, the switch [XANGLE] is used to fix the gradient
characteristic for testing. When testing, the switch [XANGLE] is set to "1" and press the
ENTER key.
• Press the END key to return to the "Test" screen.
ENTER
R
Offset characteristic
(setting "1")
(b) Quadrilateral characteristic
227
6 F 2 S 0 8 5 0
ENTER
key.
key.
ENTER
key.
X
R
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