ABB RER620, Technical Manual

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Section 5
Control functions
RER620 281
Technical Manual
loads. It supports both conventional three phase auto-reclosing and single phase
auto-reclosing.
It provides a control capability function of the recloser to trip and/or lockout whenever
there is a fault on one-phase, two-phases or three-phases. This feature allows an electric
utility to prevent unnecessary three-phase interruptions and outages of their distribution
network where a majority of outages can be attributed to single-phase transient type faults
thereby improving the overall power system reliability and quantity of power delivered to
customers on the distribution feeder.
The operation of the autoreclosing function can be described by using a module diagram.
Figure 138: Conceptual auto-reclosing function diagram
The full Autorecloser functionality consists of 3 sections or parts.
The first part of the function consists of SDAIGGIO function blocks determines which
phase(s), if any, are to be tripped. This determination is based on the condition of each
phase (whether tripped, only picked up or already open).
The second part of the function SDARREC block invokes the core autorecloser function,
which determines whether / when to reclose / lockout etc.
The third part of the function consist of SDAOGGIO block distributes the autorecloser
outputs to the phases currently active, as determined by the first part of the function.
The connections between these functions (shown as passive lines) are internal and not
visible in the application configuration.
Inputs to the function consist of per phase trip / pickup signals from various protection
functions, and the states of all poles, if any of them is / are open. Outputs from the function
consist of per phase breaker open / close commands, and lockout signals.
Input and output function blocks are basically support function blocks. Though these
functions are instantiated independently, they don't have their own settings. The core
autorecloser function which is called SDARREC and all the parameter settings to the
Inputs
Ac Ɵ ve
Phase
Detect
SDAIGGIO1..6
SDARREC (79)
Auto Recloser (CORE)
Output
Interface
SDAOGGIO
Outputs
Per Phase
Trip/
Pickup
Inputs
Pole
Status
Inputs
Trip
Selected Phases
Ac
Ɵ
ve
Phases
Open/
Reclose/
Lockout
Se
ƫ
ngs
Autoreclosing Func
Ɵ
on
Ac Ɵ ve
Phase
Detect
SDAIGGIO1..6
Ac Ɵ ve
Phase
Detect
SDAIGGIO1..6
SDARREC (79)
Auto Recloser (CORE)
Output
Interface
SDAOGGIO
Outputs
Per Phase
Trip/
Pickup
Inputs
Pole
Status
Inputs
Trip
Selected Phases
Ac
Ɵ
ve
Phases
Open/
Reclose/
Lockout
Se
ƫ
ngs
Autoreclosing Func
Ɵ
on