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Home >> ABB >> ABB CI610 3BHT300003R1 I/O Bus Extender communication unit
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ABB CI610 3BHT300003R1 I/O Bus Extender communication unit

From: | Author:Wang | Time :2024-11-26 | 57 visit: | Share:

ABB CI610 3BHT300003R1 I/O Bus Extender communication unit

Circuit-breaker replica
When the circuit-breaker replica is read in the
feeder or the bus-tie breaker, the circuitbreaker CLOSE command must also be connected.
Main current transformer
The algorithms and stabilization features used
make the busbar protection largely insensitive
to CT saturation phenomena. Main CTs types
TPS (B.S. class x), TPX, TPY, 5P.. or 10P.. are
permissible.
TPX, TPY and TPZ CTs may be mixed within
one substation in phase-fault schemes. The
relatively low CT performance needed for the
busbar protection makes it possible for it to
share protection cores with other protection
devices.
Current transformer requirements for stability during external faults (Busbar protection)
The minimum CT requirements for 3-phase
systems are determined by the maximum fault
current.
The effective accuracy limit factor (n') must be
checked to ensure the stability of the busbar
protection during external faults.
The rated accuracy limit factor is given by the
CT manufacturer. Taking account of the burden and the CT losses, the effective accuracy
limit factor n' becomes:
where:
n = rated accuracy limit factor
PN = rated CT power
PE = CT losses
PB = burden at rated current
In the case of schemes with phase-by-phase
measurement, n' must satisfy the following

two relationships:

where:

IKmax = max. primary through-fault current
I1N = rated primary CT current
Taking the DC time constant of the feeder into
account, the effective n' becomes:
(2) n' 10 for TN 120 ms, or
n' 20 for 120 ms <TN 300 ms.
where:
TN = DC time constant
Example: IKmax = 30000 A
I1N = 1000 A
TN  120 ms
Applying relationships (1) and (2):
(2) n' 10
Selected: n' 10
The current transformer requirements for
REB500sys for Line and Transformer protection are described in a separate publication
[1].
Pick-up for internal faults
In the case of internal busbar faults, CT saturation is less likely, because each CT only
conducts the current of its own feeder.
Should nevertheless CT saturation be possible, it is important to check that the minimum
fault current exceeds the setting for Ikmin.
Note:
For systems that measure I0, the REB500
questionnaire 1MRB520371-Ken should be
filled in and submitted to ABB, so that the CT
requirements can be checked in order to
ensure proper I0 measurement.
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