Application Scope - Siemens SIPROTEC 7RW80 Manual

Introduction

1.2 Application Scope

1.2 Application Scope
The digital voltage and frequency protection SIPROTEC 4 7RW80 is a versatile device designed for protection,
control, and monitoring of transformers, electrical machines and distribution systems.
The device can be used for
• System decoupling or for load shedding if ever there is a risk of a system collapse as a result of inadmissibly
large frequency drops
• Monitoring voltage and frequency thresholds.
Voltage, frequency and overexcitation protection can be used to protect generators and transformers in the
event of
• defective voltage control or defective frequency control
• Full load rejection
• Islanding generation systems.
Protection Functions
Multilevel voltage and frequency protection is the basic function of the device.
Further protection functions included are load restoration, synchrocheck, overexcitation protection, vector jump
and flexible protective functions.
Control Functions
The device provides a control function which can be accomplished for activating and deactivating switchgear
via operator buttons, port B, binary inputs and - using a PC and the DIGSI software - via the front interface.
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 equipment 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 posi-
tion 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 password request).
Processing of interlocking conditions for switching (e.g. switchgear interlocking) can be established with the aid
of integrated, user-configurable logic functions.
Messages and Measured Values; Recording of Event and Fault Data
The operational indications provide information about conditions in the power system and the device. Measure-
ment quantities and values that are calculated can be displayed locally and communicated via the serial inter-
faces.
Device messages can be assigned to a number of LEDs on the front cover (allocatable), can be externally pro-
cessed via output contacts (allocatable), linked with user-definable logic functions and/or issued via serial in-
terfaces.
During a fault (system fault) important events and changes in conditions are saved in fault protocols (Event Log
or Trip Log). Instantaneous fault values are also saved in the device and may be analized subsequently.
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SIPROTEC, 7RW80, Manual
C53000-G1140-C233-1, Release date 10.2010