Hitachi Relion REL670 Product Manual page 46

Line distance protection REL670
Version 2.2
based delta supervision (DELISPVC) provides selectivity
between load change and the fault.
Present power system has many power electronic devices
or FACTS devices, which injects a large number of
harmonics into the system. The function has additional
nd
features of 2 harmonic blocking and 3
nd
level adaption. The 2 harmonic blocking secures the
operation during the transformer charging, when high inrush
currents are supplied into the system.
Delta supervision of real input DELSPVC
Delta supervision functions are used to quickly detect
(sudden) changes in the power system. Real input delta
supervision (DELSPVC) function is a general delta function.
It is used to detect the change measured qualities over a
settable time period, such as:
• Power
• Reactive power
• Temperature
• Frequency
• Power factor
13. Control
Synchrocheck, energizing check, and synchronizing
SESRSYN
The Synchronizing function allows closing of asynchronous
networks at the correct moment including the breaker
closing time, which improves the network stability.
Synchrocheck, energizing check, and synchronizing
(SESRSYN) function checks that the voltages on both sides
of the circuit breaker are in synchronism, or with at least
one side dead to ensure that closing can be done safely.
SESRSYN function includes a built-in voltage selection
scheme for double bus and 1½ breaker or ring busbar
arrangements.
Manual closing as well as automatic reclosing can be
checked by the function and can have different settings.
For systems, which can run asynchronously, a
synchronizing feature is also provided. The main purpose of
the synchronizing feature is to provide controlled closing of
circuit breakers when two 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
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.
46
rd
harmonic start
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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
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
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.
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