asynchronous systems are in phase and can be
connected. The synchronizing feature evaluates voltage
difference, phase angle difference, slip frequency and
frequency rate of change before issuing a controlled
closing of the circuit breaker. Breaker closing time is a
setting.
Autorecloser SMBRREC
M12390-3 v17
The auto recloser (SMBRREC) function provides:
• high-speed and/or delayed auto reclosing
• single and/or three phase auto reclosing
• support for single or multi-breaker applications.
The auto recloser can be used for delayed busbar
restoration.
Up to five reclosing shots can be performed. The first
shot can be single-, two-, and /or three-phase
depending on the type of the fault and the selected auto
reclosing mode.
Several auto reclosing functions can be provided for
multi-breaker arrangements. A priority circuit allows one
circuit breaker to reclose first and the second will only
close if the fault proved to be transient.
Each auto reclosing function can be configured to co-
operate with the synchrocheck function.
Apparatus control APC
M13444-3 v16
The apparatus control functions are used for control and
supervision of circuit breakers, disconnectors and
earthing switches within a bay. Permission to operate is
given after evaluation of conditions from other
functions such as interlocking, synchrocheck, operator
place selection and external or internal blockings.
Apparatus control features:
• Select-Execute principle to give high reliability
• Selection function to prevent simultaneous operation
• Selection and supervision of operator place
• Command supervision
• Block/deblock of operation
• Block/deblock of updating of position indications
• Substitution of position and quality indications
• Overriding of interlocking functions
• Overriding of synchrocheck
• Operation counter
• Suppression of mid position
Two types of command models can be used:
• Direct with normal security
• SBO (Select-Before-Operate) with enhanced security
Normal security means that only the command is
evaluated and the resulting position is not supervised.
Enhanced security means that the command is
evaluated with an additional supervision of the status
value of the control object. The command sequence with
enhanced security is always terminated by a
CommandTermination service primitive and an
AddCause telling if the command was successful or if
something went wrong.
Control operation can be performed from the local HMI
with authority control if so defined.
Interlocking
M13531-3 v4
The interlocking function blocks the possibility to
operate primary switching devices, for instance when a
disconnector is under load, in order to prevent material
damage and/or accidental human injury.
Each apparatus control function has interlocking
modules included for different switchyard
arrangements, where each function handles interlocking
of one bay. The interlocking function is distributed to
each IED and is not dependent on any central function.
For the station-wide interlocking, the IEDs communicate
via the system-wide interbay bus (IEC 61850-8-1) or by
using hard wired binary inputs/outputs. The
interlocking conditions depend on the circuit
configuration and apparatus position status at any
given time.
For easy and safe implementation of the interlocking
function, the IED is delivered with standardized and
tested software interlocking modules containing logic
for the interlocking conditions. The interlocking
conditions can be altered, to meet the customer’s
specific requirements, by adding configurable logic by
means of the graphical configuration tool.
Switch controller SCSWI
M13486-3 v10
The Switch controller (SCSWI) initializes and supervises
all functions to properly select and operate switching
primary apparatuses. The Switch controller may handle
and operate on one multi-phase device or up to three
one-phase devices.
Circuit breaker SXCBR
M13489-3 v6
The purpose of Circuit breaker (SXCBR) is to provide the
actual status of positions and to perform the control
operations, that is, pass all the commands to primary
apparatuses in the form of circuit breakers via binary
output boards and to supervise the switching operation
and position.
Circuit switch SXSWI
M16492-3 v6
The purpose of Circuit switch (SXSWI) function is to
provide the actual status of positions and to perform
the control operations, that is, pass all the commands to
primary apparatuses in the form of disconnectors or
earthing switches via binary output boards and to
supervise the switching operation and position.
Line differential protection RED670
1MRK 505 379-BEN N
44 Hitachi Power Grids
© Copyright 2017 Hitachi Power Grids. All rights reserved
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