Step No.
Changes after step 5
Expected output
6-b
Change I
UNBL1
= 0.45
∠
0° A
ALARM and ALML1 signals should become HIGH after
the set time delay
IUNBL1 = 4.5 A
IUNBCLCL1 = 2.5 A which is equivalent to 25% of
IBase2
START and TRIP TEST
6-c
Change I
UNBL1
= 0.55
∠
0° A
•
START and STL1 signals should become HIGH
•
TRIP and TRL1 signals should become HIGH
after the set time delay, if
BlockTrip
is set to
Trip
enabled
IUNBL1 = 5.5 A
IUNBCLCL1 = 3.5 A which is equivalent to 35%
of IBase2
*
- CT ratios of the phase currents (1000/1 A) and unbalance currents (10/1 A). The values of IB1 and IB2 are
considered as 1000 A and 10 A, respectively. The current inputs I
L1
, I
L2
, and I
L3
refer to the phase current
inputs and I
UNBL1
refers to the unbalance current inputs.
To calculate IREFUNBL1 in
, use the following equation:
IL1
IREFUNBL1
IMEMUNBL1
IMEML1
=
´
IECEQUATION19378 V1 EN-US
(Equation 26)
To calculate IUNBCLCL1 in
, use the following equation:
IUNBCLCL1
IUNBL1
IREFUNBL1
=
-
IECEQUATION19377 V1 EN-US
(Equation 27)
The measured unbalance current is referred with respect to its reference current.
Refer
Technical manual
for more information about unbalance current calculation.
Testing with 3 Unbalance Curr option
GUID-C028CACA-D487-4DD1-B7CA-92219F3A41F0 v1
1.
Set the following parameters:
•
Operation
=
ON
•
SCBConf
=
3 unbalance curr
•
tDefTrip = 5.00 s; tDefAlm = 5.00 s; tDefWrn = 5.00 s
•
IUnbal>
=
30% IB2
•
IUnbalAlm>
=
20% IB2
•
IUnbalWrn>
=
10% IB2
•
IMin
=
10% IB1
2.
The logical signals and service values for SCUCPTOC function are available on the local HMI
under:
Main menu/Tests/Function status/Unbalance protection /
CapBankCurrentUnbalance(60N, Iub>)/SCUCPTOC(60N, Iub>):x/outputs
, where x =
instance number.
3.
To store the unbalance current values, perform these steps:
1MRK 511 403-UEN Rev. L
Section 11
Testing functionality by secondary injection
Bay control REC670
133
Commissioning manual
© 2017 - 2022 Hitachi Energy. All rights reserved
Содержание REC670
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