ABB RED670 Relion 670 series, Руководство по вводу в эксплуатацию

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current can be set separately as a ratio of the injected current. For example, in a line
with three IEDs the return current from each remote IED is set to 50% of the
injected current. Current I
injected, L1
is injected in phase L1 to get the following
differential and bias currents:
Phase L1:
1 1 , 1 L L injected L
IDiff IBias I
= =
EQUATION1458 V1 EN-US
(Equation 1)
Phase L2:
2 2 , 1
1 240
L L injected L
IDiff IBias I
= = × Ð °
EQUATION1459 V1 EN-US
(Equation 2)
Phase L3:
IDiff
L 3
= IBias
L 3
= 0
EQUATION1460 V2 EN-US
(Equation 3)
11.3.3.1 Verifying the settings
GUID-6C24AEF3-CD9A-4F39-A696-0125081F4892 v2
1. Block the trip signal from all involved IEDs with local operation released (see
step
3 ).
2. Set Test mode = On to test the L4CPDIF function.
3. Release the local function with setting ReleaseLocal in local HMI under
Main menu/Test/Line differential test/LineDiffLogic
4. Set the factor of the return currents to 1/(number of current IEDs = 1).
5. Inject a current in phase L1, and increase the current until L4CPDIF operates
for phases L1 and L2. The injected operate current must correspond to the set
IdMin . The service values for IDiffL1 , IBiasL1 , IDiffL2 and IBiasL2 must be
equal to the injected current.
6. Repeat the current injection in phases L2 and L3.
7. Inject a symmetrical three-phase current, and increase the current until
operation is achieved in all three phases. The injected operate current must
correspond to the set
IdMin . The service values for IDiffL1 , IBiasL1 , IDiffL2 ,
IBiasL2 , IDiffL3 and IBiasL3 must be equal to the injected current.
8. Read the transmission delay.
9. Measure the operate time by injecting a single-phase current in phase L1. The
injected current must be 4 x the operate current. Time measurement is stopped
by the trip output.
Tripping time in this loop test includes sending local currents
to the remote end, and sending them back. This means that
tripping time is double the time achieved with real faults or in
bench testing.
Section 11
1MRK 505 378-UEN A
Testing functionality by secondary injection
108 Line differential protection RED670 2.2 IEC
Commissioning manual