Function Revision History; Testing The Directional Comparison Logic Function - Hitachi RED670 Commissioning Manual

Section 11
Testing functionality by secondary injection
11.11.5.1

Function revision history

Document
revision
B
C
D
E
F
G
H
J
K
L
M
11.11.5.2

Testing the directional comparison logic function

Blocking scheme
1. Inject the polarizing voltage 3U0 at 5% of UBase (EF4PTOC) where the current is lagging the
voltage by 65°.
2. Inject current (65° lagging the voltage) in one phase at about 110% of the set operating current,
and switch the current off with the switch.
3. Switch the fault current on and measure the operating time of the communication logic.
Use the TRIP signal from the configured binary output to stop the timer.
4. Compare the measured time with the set value tCoord.
5. Activate the CR binary input.
6. Check that the CRL output is activated when the CR input is activated.
7. Switch the fault current on (110% of the set operating current) and wait longer than the set
value tCoord.
8. Switch the fault current off.
9. Reset the CR binary input.
10. Activate the BLOCK digital input.
11. Switch the fault current on (110% of the set operating current) and wait for a period longer than
the set value tCoord.
12. Switch the fault current and the polarizing voltage off.
13. Reset the BLOCK digital input.
Permissive scheme
224
Product History
revision
2.2.1 -
2.2.2 -
2.2.2
2.2.2 -
2.2.3 -
2.2.3 -
2.2.3 -
2.2.4 -
2.2.4 -
2.2.4
2.2.5 Added separate DOs for teleprotection permissive (TxPrm & RxPrm1), blocking (TxBlk &
RxBlk1) and direct trip (TxTr & RxTr1) transmit and receive signals in accordance with
61850 Ed 2.0.
No TRIP signal should appear.
No TRIP signal should appear.
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Line differential protection RED670
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