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6.6 Conjunctive Tests
6.6.1
On Load Test
With the relay connected to the line which is carrying load current, it is possible to check the
polarity of the voltage and current transformers and the phase rotation with the metering displays
on the LCD screen.
• Open the following "Metering" screen from the "Status" sub-menu.
/ 2
V a
V b
V c
. . .
. . .
A c t i v e
R e a c t i
F r e q u e
Note: The magnitude of voltage, current and power can be set in values on the primary side or on
the secondary side by the setting. (The default setting is the primary side.)
Phase angles are expressed taking that of the positive sequence voltage as the reference angle.
The sign of the phase angle can be set positive for either lagging phase or leading phase. (In
the default setting, it is set positive when the phase is leading to the reference angle.)
The sign of the power flow direction can be set positive for either power sending or power
receiving. (The default setting is power sending.)
• Check that the phase rotation is correct.
• Verify the phase relationship between the voltage and current with a known load current
direction.
6.6.2
Signaling Circuit Test
This test is performed when a command protection using a signaling channel is applied.
The test is to check whether the communication circuit is correctly connected between a
and a remote terminal.
Signal channel for current differential protection:
Input the voltage or current at a remote terminal relay. Check the voltage and current by the
"Metering" screen from the "Status" sub-menu at a local relay.
Signal channel for command protection:
This test is performed when a command protection using a signaling channel is applied. The test
is carried out after the signal receive and send contacts are connected to the telecommunication
circuit.
The signal send circuit from the relay to the telecommunication equipment is checked by
forcibly operating the signal send relay and monitoring the signal at the telecommunication
equipment.
Signal sending is performed on the LCD using the "Test" sub-menu as follows.
M e t e r i n g
1 2 / F e b / 1 9 9 8
. 0 °
6 3 . 5 V
0
. 0 °
6 3 . 4 V
- 1 2 0
. 1 °
6 3 . 5 V
1 2 0
p o w e r
+
v
e
p o w e r
-
n
c
y
277
2 2 : 5 6
l a
2 . 1 0
A
- 1 1 5 . 0 °
l
b
2 . 1 0
A
l c
2 . 1 5
A
4 0 0 . 1 1 M
W
2 5 . 5 1 M
v
a
r
6 0 . 1
H z
6 F 2 S 0 8 5 0
3 / 1 3
4 . 9 °
1 2 5 . 1 °
- Quick Links:
- Current Differential Protection
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