Beluk KSR-Z Mode d’emploi

Technical Documentation

KSR-Z –Capacitor-Bank Protection Relay

Rev. 04

Beluk GmbH

Taubenstrasse 1

D-86956 Schongau

Germany

Tel.: +49/(0)8861/2332-0

Fax: +49/(0)8861/2332-22

E-mail: [email protected]

Web: http://www.beluk.de

Technical Documentation

Capacitor-Bank Protection-Relay

KSR-Z

Technical Documentation

KSR-Z –Capacitor-Bank Protection Relay

Rev. 04

Page 2/36

Revision history

Date

Name

Revision

Change

07.11.11

Initial document release

04.11.15

ChP

Password description corrected.

10.11.15

ChP

Earth fault protection and natural unbalance compensation

descriptions corrected. List of metering values updated.

18.07.18

Content correction

Technical Documentation

KSR-Z –Capacitor-Bank Protection Relay

Rev. 04

Page 3/36

Contents

Section 1: Overview .................................................................................................................4

Section 2: Protection Function and Other Features ..............................................................5

Section 3: Usage and Main menu..........................................................................................11

Section 4: Technical Specifications......................................................................................24

Section 5: Drawings...............................................................................................................28

Section 6: Applications..........................................................................................................31

Section 7: Commissioning Guide..........................................................................................32

Section 8: Maintenance..........................................................................................................34

Section 9: Appendix...............................................................................................................35

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KSR-Z –Capacitor-Bank Protection Relay

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Section 1: Overview

KSR-Z Capacitor Bank protection device has been designed to protect thecapacitors from overload,

over voltage and unbalance with the advanced and flexible microprocessor technology.

A wide range of protection elements are supplemented by advanced features such as control,

metering, data storage, fault recorder, remote communications, supervision and self monitoring

features.

An HMI LCD display on the front of the device gives user-friendly access to read the measurements,

view and edit relay settings and operational annunciation’s. The backlit provides a good visibility

even in the poor room illumination. Four context soft keys facilitate easy andflexible parameterisation

through LCD display without the need of manual.

An interface is provided at the rear side of the device for remote communications via RS485 with

MODBUS protocol.

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Section 2: Protection Function and Other Features

2.1 Introduction

KSR-Z device accepts 4 current inputs and 3 voltage inputs.

A full range “Fast Fourier Transformation” is performed on the input data of all channels (3 Voltage

channels, 4 Current channels). Thus provides information about the harmonic contents which distort

the sine waveform of the current and voltage channels up to 51 order.

Current inputs are available with two options either 1A input or 5A input.

Current IL1IL2IL3 inputs used to achieve overload protection, while IUB achieves unbalance protection.

Current measurements are derived from these inputs.

Voltage VL1VL2VL3 inputs used to achieve over voltage and under voltage protection. Voltage

measurements are derived from these inputs.

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2.2 Protection Elements

2.2.1 Overload and Unbalance protection

Current IL1IL2IL3 and IUB elements provide Overload and Unbalance protection respectively. Each

element is pre-programmed to have two independent stages (Alarm and Trip) for current setting and

DTL (definite time lag) characteristic or trip characteristic as described in section 3 and Appendix B.

For Overload protection the current can be monitored as follows:

OL = current as trms value

OLth= current as thermal damped value

OLf= current as fundamental value (Only ground wave 50 or 60 Hz)

Samples of the current input signals are taken at a frequency of 6,4 kHz. This enables KSR-Z to

act as a True RMS measuring device (TRMS) over a wide frequency range.

2.2.2 Overvoltage and Undervoltage Protection

Voltage VL1VL2VL3 elements provide Over-voltage and Under-voltage. Each element can is pre-

programmed to have two independent stages (Alarm and Trip) for current setting and DTL (definite

time lag) characteristic or trip characteristic as described in section 3 and Appendix B.

Samples of the voltage input signals are taken at a frequency of 6,4 kHz. This enables KSR-Z to act

as a True RMS measuring device (TRMS) over a wide frequency range.

2.2.3 Voltage asymmetric protection

The KSR-Z is monitoring the deviation between all line voltages. For the monitoring function it’s

possible to adjust an allowed deviation from 1% -99.99%. To calculate the Voltage asymmetry the

IEEE formula is used:

PVUR =

max voltage deviation from the avg. phase voltage

*100

Avg. phase voltage

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2.2.4 Earth fault protection

The KSR-Z calculates the earth fault current as the RMS value of the vector sum from the three

currents IL1IL2IL3. All values are taken from the fundamental wave. EF is compared with two

adjustable thresholds, EF trip and EF alarm. For each threshold it’s adjustable to use an

adjustable time delay or select a trip characteristic.

2.2.5 Protection against repetitive overload and over voltage

To avoid damages of the capacitors due to repetitive overload or over voltage which is to short to

be detected by the normal monitoring functions, the KSR-Z has an additionally timer to detect such

repetitive events. If an adjusted threshold is exceeded, the time for the threshold violation is stored

and subtracted from the delay time respective the trip characteristic to get an alarm or trip event if

this violation occurs multiple during a critical time frame. To switch off this additional timer set “T-

RESET” to “0” in the protection settings.

2.2.6 Hysteresis of threshold values

For the adjusted alarm thresholds the KSR-Z uses depending on the trigger a pickup respectively a

dropout ratio. In case of monitoring a value "greater than", the device triggers an alarm at the

adjusted value and go back to normal at value * 0,97. For the monitoring of values "less than", the

function works vice versa (value * 1,03).

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2.2.7 Output contacts

KSR-Z relays are available with two types of output contacts

- two change over contacts

- four normally open contacts

Output contacts are user programmable to operate from protection characteristic, DTL for different

protection functions and relay self-monitoring feature (watchdog). These output contacts are shown

in de-energized state in the drawing under section 5.

Under normal mode of operation, output contacts remain energized for the adjusted time delay or

trip characteristic for T-OFF or for the duration of fault detected by the protection function.

Alternatively, outputs can be programmed to operate as latching contacts, if required. It is also

possible to invert the operation of the output contacts.

The factory settings of the relays are shown on the table under point 3.3.4

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2.3 Other features

2.3.1 Natural unbalance compensation

The KSR-Z contains the function "natural unbalance compensation". This function allows to

measure and store the natural unbalance current (Inuc)at the protected capacitor banks. The value

of the natural unbalance current depends on production tolerances of the used capacitors. The

unbalance current is measured in the star point connection of two stages. This current can be

compensated in amplitude and phase angle to zero, to detect further changes in phase angle and

absolute value. During the normal operation the KSR-Z subtracts the stored Inuc value from the

current In. The result of this operation should be "0". In case of variations of this result it is possible

to set a threshold between 0.01A and 50kA to trigger an alarm.

Attention: The natural unbalance compensation is only possible with a voltage signal between L1

–N and a current signal at current channel 1. This signals are needed get the information of the

phase angle and absolute value.

2.3.2 Metering functions

The KSR-Z metering features provide continuous measurement of Currents and Voltages which are

connected as analogue inputs. The signal processor calculates different values from these inputs.

VLine to Neutral TRMS Voltages VL1-N, VL2-N, VL3-N

VLine to Line TRMS Voltages VL1-L2, VL2-L3, VL3-L1

THD THD –factors for voltages (VLine to Neutral) and currents (IL1, IL2, IL3, IUB)

I TRMS Current IL1, IL2, IL3, IUB

If RMS values of fundamental waves of currents IL1, IL2, IL3 and IUB

(without harmonics)

I UC4 Unbalanced current compensated value IUC4

I EF Earth fault current actual value IEF and compensated value IEF-cp

Ith exponentially damped current values of IL1, IL2, IL3 and IUB to simulate

thermal measurement

T ambient temperature

Harmonics Order of (3-51) for current and voltages (only ODD harmonic orders)

Please check Appendix A for detailed explaination of thermal damping function.

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Rev. 04

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2.4 Digital Input

Each trip or alarm can be blocked via the DI. This input is detected as active, when there is a voltage

between 50 - 132 VDC. The sensing of the DI can be changed to low active as well. See details at

the table at item 3.3.4.

2.5 Trip characteristic

With the KSR-Z it is possible to select a adjustable delay time or one of 10 tripping characteristics.

For the characteristics please check appendix B.

Following trip characteristics are available:

U1 = U.S. Moderately inverse

U2 = U.S. Inverse

U3 = U.S. Very inverse

U4 = U.S. Extremely inverse

U5 = U.S. Short-time inverse

C1 = I.E.C. Class A –Standard inverse

C2 = I.E.C. Class B –Very inverse

C3 = I.E.C. Class C –Extremely inverse

C4 = I.E.C. Long-time inverse

C5 = I.E.C. Short-time inverse

Table des matières

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