ABB Relion REG670, Technical Manual

Page: 650 / 1298

Function Range or value Accuracy
Time delay for energizing
check when voltage jumps
from 0 to 90% of Urated
(0.000-60.000) s ± 0.2% or ± 100 ms whichever is
greater
Operate time for
synchrocheck function when
angle difference between bus
and line jumps from
“PhaseDiff” + 2 degrees to
“PhaseDiff” - 2 degrees
Min = 15 ms
Max = 30 ms
–
Operate time for energizing
function when voltage jumps
from 0 to 90% of Urated
Min = 70 ms
Max = 90 ms
–
14.2 Interlocking
14.2.1 Functionality
The interlocking functionality blocks the possibility to operate high-voltage
switching devices, for instance when a disconnector is under load, in order to prevent
material damage and/or accidental human injury.
Each control IED has interlocking functions for different switchyard arrangements,
each handling the interlocking of one bay. The interlocking functionality in each IED
is not dependent on any central function. For the station-wide interlocking, the IEDs
communicate via the station bus or by using hard wired binary inputs/outputs.
The interlocking conditions depend on the circuit configuration and status of the
system at any given time.
14.2.2 Operation principle
The interlocking function consists of software modules located in each control IED.
The function is distributed and not dependent on any central function.
Communication between modules in different bays is performed via the station bus.
The reservation function (see section "Functionality" ) is used to ensure that HV
apparatuses that might affect the interlock are blocked during the time gap, which
arises between position updates. This can be done by means of the communication
system, reserving all HV apparatuses that might influence the interlocking condition
of the intended operation. The reservation is maintained until the operation is
performed.
After the selection and reservation of an apparatus, the function has complete data on
the status of all apparatuses in the switchyard that are affected by the selection. Other
operators cannot interfere with the reserved apparatus or the status of switching
devices that may affect it.
Section 14
1MRK502052-UEN B
Control
644
Technical manual