ABB REG316 1mrk000809-GA Numerical Generator Protection

ABB REG316 1mrk000809-GA Numerical Generator ProtectionWithin the PYRAMID® system for integrated control and protection, REG 316*4 represents one of the compact generator

protection units.

Because of its compact design, the use of only a few different

hardware units, modular software and continuous self-monitoring

and diagnostic functions, the REG 316*4 scheme optimally fulfils

all the demands and expectations of a modern protection

scheme with respect to efficient economic plant management

and technical performance.

The AVAILABILITY — the ratio between fault-free operating time

and total operational life — is certainly the most important requirement a protection device has to fulfil. As a result of continuous monitoring, this ratio in the case of REG 316*4 is almost

unity.

Operation, wiring and compactness of the protection are the essence of SIMPLICITY thanks to the interactive, menu-controlled

man/machine communication (HMC) program. Absolute FLEXIBILITY of the REG 316*4 scheme, i.e. adaptability to a specific

primary system or existing protection (retrofitting), is assured by

the supplementary functions incorporated in the software and by

the ability to freely assign inputs and outputs via the HMC.

Decades of experience in the protection of generators have gone

into the development of the REG 316*4 to give it the highest

possible degree of RELIABILITY, DISCRIMINATION and STABILITY. Digital processing of all the signals endows the scheme

with ACCURACY and constant SENSITIVITY throughout its

useful life.

The designati

Application

The REG 316*4 numerical generator protection has been

designed for the high-speed discriminative protection of small

and medium size generators. It can be applied to units with or

without step-up transformer in power utility or industrial power

plants.

REG 316*4 places relatively low requirements on the performance of c.t’s and v.t’s and is independent of their characteristics.

1.3. Main features

REG 316*4’s library of protection functions includes the following:

generator differential (Diff-Gen)

transformer differential (Diff-Transf )

definite time over and undercurrent (Current-DT)

provision for inrush blocking

peak value overcurrent (Current-Inst)

voltage-controlled overcurrent (Imax-Umin)

inverse time overcurrent (Current-Inv)

directional definite time overcurrent (DirCurrentDT)

protection

directional inverse time overcurrent (DirCurrentInv)

protection

definite time NPS (NPS-DT)

inverse time NPS (NPS-Inv)

definite time over and undervoltage (Voltage-DT)

peak value overvoltage (Voltage-Inst)

underimpedance (Underimped)

underreactance (MinReactance)

power protection (Power)

stator overload (OLoad-Stator)

rotor overload (OLoad-Rotor)

frequency (Frequency)

rate-of-change frequency protection (df/dt)

overexcitation (Overexcitat)

inverse time overexcitation (U/f-Inv)

voltage comparison (Voltage-Bal)

overtemperature (Overtemp)

100 % stator ground fault (Stator-EFP)

100 % rotor ground fault (Rotor-EFP)

pole slipping (Pole-Slip)

invers time ground fault overcurrent (I0-Invers)

breaker failure protection (BreakerFailure)

supplementary logic functions such as

supplementary user logic programmed using CAP316

(function plan programming language FUPLA). This

requires systems engineering.

logic

timers

metering

debounce.

The following measuring and monitoring functions are also available:

single-phase measuring function UIfPQ

three-phase measurement module

three-phase current plausibility

three-phase voltage plausibility

disturbance recorder.

The scheme includes an event memory.

The allocation of the opto-coupler inputs, the LED signals and

the auxiliary relay signal outputs, the setting of the various parameters, the configuration of the scheme and the display of the

events and system variables are all performed interactively using

the menu-driven HMC (man/machine communication).

REG 316*4 is equipped with serial interfaces for the connection

of a local control PC and for remote communication with the

station control system.

REG 316*4 is also equipped with continuous self-monitoring and

self-diagnostic functions. Suitable testing devices (e.g. test set

XS92b) are available for quantitative testing.

REG 316*4 can be semi-flush or surface mounted or can be installed in an equipment rack.

Protection function inputs and outputs

3.2.1. C.t./v.t. inputs

(see Section 5.5.4.1.)

The protection scheme can include three types of input transformers which may also have different ratings:

protection c.t’s

metering c.t’s (core-balance)

v.t’s.

The number and arrangement of the input transformers are defined by the value given for configuration code K.. or by entering

K=0 and specifying the required input transformer.

Before being processed by the protection functions, the currents

and voltages coming from the input transformers are digitised in

the analogue section of the main processor module.

Every analogue input channel is defined as being either single or

three-phase:

C.t's:

three-phase protection

single-phase protection

single-phase metering (core-balance)

V.t's:

three-phase Y connected

single-phase.

A protection function can only be used in a three-phase mode, if

a corresponding three-phase group of c.t./v.t. input channels is

available.

All protection function settings are based on the REG 316*4

input values (secondary ratings). The fine adjustment to suit the

effective primary system quantities is accomplished by varying

the reference settings of the analogue inputs.