Application Scope - Siemens 7SC80 Manual

1.2

Application Scope

The Feeder Protection and Recloser Controller 7SC80 can be used to protect, control, and monitor the line
protection in networks with grounded, low-resistance grounded, isolated, or compensated neutral. It is suit-
able for radial networks supplied from a single source, open or closed looped networks, and for lines with
sources at both ends.
The Feeder Protection and Recloser Controller 7SC80 includes the functions that are usually necessary for
protection, monitoring of circuit breaker positions and control of circuit breakers; therefore, the device can be
employed universally. The device also provides excellent backup protection of differential protective schemes
of any kind.
The Feeder Protection and Recloser Controller is particularly well suited for application in distribution network
automation outside the switchgear. It covers the special requirements for the temperature range, the remote
control feature, and remote access.
The optional GPS/IRIG-B module enables time synchronization of the Feeder Protection and Recloser Controller
7SC80 exact to the millisecond.
Protection Functions
Non-directional and directional time overcurrent protection are the basic functions of the device. There are 3
definite time elements and one inverse time element for the phase currents and the ground current. For the
inverse time element, several characteristics of different standards are provided.
Depending on the order variant, additional protection functions such as frequency protection, undervoltage
and overvoltage protection, ground fault protection, breaker failure protection, or overload protection are
included.
The automatic reclosing function enables several different reclosing cycles for overhead lines. An external
automatic reclosing system can also be connected. To ensure quick detection of the fault location after a short
circuit, the device is equipped with a fault locator.
Before reclosing after a three-pole tripping, the device can verify the validity of the reclosure via a voltage
check and/or a synchrocheck. The synchrocheck function can also be controlled externally.
Control Functions
The device provides a control function which can be used to activate and deactivate switching devices via the
operation panel, the Web Monitor, port F, binary inputs, and the USB interface using DIGSI.
The status of the primary equipment can be transmitted to the device via auxiliary contacts connected to
binary inputs. The present status (or position) of the primary equipment can be displayed on the device, and
used for interlocking or alarm condition monitoring. The number of operating equipments to be switched is
limited by the binary inputs and outputs available in the device or the binary inputs and outputs allocated for
the switch position indications. Depending on the primary equipment being controlled, one binary input
(single point indication) or two binary inputs (double point indication) may be used for this process.
The capability of switching primary equipment can be restricted by a setting associated with switching
authority (Remote or Local), and by the operating mode (interlocked/non-interlocked, with or without pass-
word request).
Processing of interlocking conditions for switching (e.g. switchgear interlocking) can be established with the
aid of integrated, user-configurable logic functions.
The service interlocking function allows you to block switching operations which can be triggered for the
configured switching devices via the device.
Indications and Measured Values; Fault Recording
The operational indications provide information about conditions in the power system and the device. Meas-
urement quantities and values that are calculated can be displayed locally and communicated via the serial
interfaces.
Device indications can be processed externally via output contacts (routable), linked with user-definable logic
functions, and/or issued via various interfaces. Furthermore, indications can be output to a number of LEDs
(routable) and displayed on the optional operation panel or using the Web Monitor.
SIPROTEC Compact, 7SC80, Manual
E50417-G1140-C486-A8, Edition 07.2017
Introduction
1.2 Application Scope
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