Restrike Detection - ABB REC670 Applications Manual

1MRK 511 401-UEN A
8.15.3.1
8.16
8.16.1
Bay control REC670 2.2 IEC
Application manual
HOLDTU> =200% (of SCB voltage rating); Voltage level required for pickup
tHOLDT =10s; Definite time delay for harmonic overload trip
Settings for IDMT delay step
HOLIDMTU> =110% (of SCB voltage rating); Voltage level required for pickup of
IDMT stage. Selected value gives pickup recommended by international standards.
kHOLIDMT =1.0; Time multiplier for IDMT stage. Selected value gives operate
time in accordance with international standards
tMaxHOLIDMT =2000s; Maximum time delay for IDMT stage for very low level
of harmonic overload
tMinHOLIDMT =0.1s; Minimum time delay for IDMT stage. Selected value gives
operate time in accordance with international standards

Restrike detection

Opening of SCBs can be quite problematic for certain types of circuit breakers
(CBs). Typically such problems are manifested as CB restrikes.
In simple words this means that the CB is not breaking the current at the first zero
crossing after separation of the CB contacts. Instead current is re-ignited and only
braked at consecutive current zero crossings. This condition is manifested as high
current pulses at the moment of current re-ignition.
To detect this CB condition, the built in overcurrent feature can be used. Simply,
any start of the overcurrent feature during breaker normal opening means a
restrike. Therefore simple logic can be created in the Application Configuration
tool to detect such CB behavior. Such CB condition can be just alarmed, and if
required, the built in disturbance recorder can also be triggered.
To create this logic, a binary signal that the CB is going to be opened (but not trip
command) shall be made available to the IED.
Voltage-restrained time overcurrent protection
VRPVOC
Identification
Function description
Voltage-restrained time overcurrent
protection
Current protection
IEC 61850 IEC 60617
identification identification
VRPVOC I>/U<
Section 8
GUID-114747A5-0F7C-4F48-A32D-0C13BFF6ADCE v1
GUID-613620B1-4092-4FB6-901D-6810CDD5C615 v4
GUID-7835D582-3FF4-4587-81CE-3B40D543E287 v4
ANSI/IEEE C37.2
device number
51V
221