Control - ABB Relion 650 Series Product Manual

Transformer protection RET650
Version 2.2
For better adaptation to system requirements, an operation
mode setting has been introduced which makes it possible
to select the operating conditions for negative sequence
and zero sequence based function. The selection of
different operation modes makes it possible to choose
different interaction possibilities between the negative
sequence and zero sequence based detection.
A criterion based on delta current and delta voltage
measurements can be added to the fuse failure supervision
function in order to detect a three phase fuse failure, which
in practice is more associated with voltage transformer
switching during station operations.
Voltage based delta supervision DELVSPVC
Delta supervision function is used to quickly detect (sudden)
changes in the network. This can, for example, be used to
detect faults in the power system networks and islanding in
grid networks. Voltage based delta supervision
(DELVSPVC) is needed at the grid interconnection point.
Current based delta supervision DELISPVC
Delta supervision function is used to quickly detect (sudden)
changes in the network. This can, for example, be used to
detect disturbances in the power system network. Current
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

9. 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
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harmonic start
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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.
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.
The apparatus control function APC5 for up to 5
apparatuses is 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
Direct commands are received with no prior select
command. SBO commands are received with a select
command first and on successful selection, a proceeding
operate command.
In normal security, the command is processed and the
resulting position is not supervised. However with enhanced
1MRK 504 172-BEN G
M13444-3 v16
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