Beluk KSR-Z Guide

Technical Documentation
KSR-Z –Capacitor-Bank Protection Relay
Rev. 04
Beluk GmbH
Taubenstrasse 1
D-86956 Schongau
Germany
Tel.: [phone]
Fax: [phone]
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
Le
01
Initial document release
04.11.15
ChP
02
Password description corrected.
10.11.15
ChP
03
Earth fault protection and natural unbalance compensation
descriptions corrected. List of metering values updated.
18.07.18
SO
04
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

Technical Documentation
KSR-Z –Capacitor-Bank Protection Relay
Rev. 04
Page 4/36
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.

Technical Documentation
KSR-Z –Capacitor-Bank Protection Relay
Rev. 04
Page 5/36
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.

Technical Documentation
KSR-Z –Capacitor-Bank Protection Relay
Rev. 04
Page 6/36
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

Technical Documentation
KSR-Z –Capacitor-Bank Protection Relay
Rev. 04
Page 7/36
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).

Technical Documentation
KSR-Z –Capacitor-Bank Protection Relay
Rev. 04
Page 8/36
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

Technical Documentation
KSR-Z –Capacitor-Bank Protection Relay
Rev. 04
Page 9/36
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
1
T ambient temperature
Harmonics Order of (3-51) for current and voltages (only ODD harmonic orders)
1
Please check Appendix A for detailed explaination of thermal damping function.

Technical Documentation
KSR-Z –Capacitor-Bank Protection Relay
Rev. 04
Page 10/36
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

Technical Documentation
KSR-Z –Capacitor-Bank Protection Relay
Rev. 04
Page 11/36
Section 3: Usage and Main menu
The device provides 4 keys to the user to accept any inputs. The keys are numbered key 1... key 4
from left to right. The actual function of a certain key changes due to the actual context. The keys
function is indicated by small pictograms in the bottom line of the display.
After turning on the supply power, the KSR-Z automatically starts with displaying values of the
measurement menu. The key, which is labelled with capital letters „M“ can be used to switch to the
main menu.
In the main menu, one can choose between the following possibilities:
3. Main menu
3.1. measurement = display measured values
3.2. harmonics = display harmonics
3.3. setup = device setup sub-menu
3.4. device info = display device information
3.5. reset alarms = reset all relays, configured with “manual reset”
3.6. fault recorder = displays all recorded alarms with time stamp and grid data's
Use the keys „“ and „“ to place the desired entry next to the tiny arrow („>“) on the left side. Press
the „“ - key to activate the selected entry.
Whenever a capital “M” is used as key symbol in any sub-menu, pressing the key
will switch straight to the main menu.
!

Technical Documentation
KSR-Z –Capacitor-Bank Protection Relay
Rev. 04
Page 12/36
3.1 Menu “measurement”
This menu holds nearly all the measured values. Each value is displayed together with its name
(VLN, Ith,... ) and its origin (L1, L2, L3, N). The units of the measured values are also displayed. Use
keys „“ and „“ to select from the variety of measured values.
In the top line the actual state of the assembled relays is shown with the backlit on each number. A
dark number on bright ground represents an inactive relay. Inverse display (bright number on dark
ground) indicates an activated relay.
The „M“ - key switches back to the main menu.

Technical Documentation
KSR-Z –Capacitor-Bank Protection Relay
Rev. 04
Page 13/36
3.2 Menu “harmonics”
All harmonics are normalized to 100% of the fundamental harmonic. Key ““ selects the data source
(voltages, currents), ““ and ““ move the display to higher and lower harmonics. The index, which
is shown with each harmonic, specifies its order. The fundamental harmonic (index 01) is not shown
as it is always 100%.
If the harmonic display quotes “not available”, the current or voltage, which
sources the harmonic calculation is below a certain threshold or even not present.
This makes the FFT calculation of the harmonics very inaccurate or impossible.
!

Technical Documentation
KSR-Z –Capacitor-Bank Protection Relay
Rev. 04
Page 14/36
3.3 Menu “setup”
In factory settings the “setup” menu is protected by a password: 2402. If another password or no
protection is required, please check point 3.3.5. This submenu allows to set an individual password.
Because of the huge amount of setup possibilities, a set of submenus is used.
At certain points the user will be confronted with the need to enter numeric values. The KSR-Z will
prompt with the old or a default value. One digit of this value will be marked with a “_“ below it. Now
this digit can be changed with the „+“ and „-“ keys. „“ will switch to the next digit which can then
be altered as described. After you have reached the last digit, press the right button once more and
the new value will be used by the device.

Technical Documentation
KSR-Z –Capacitor-Bank Protection Relay
Rev. 04
Page 15/36
3.3.1 Menu “setup->parameter”
System parameters:
„vt ratio“ - ratio of a VT
„ct-I123 ratio“ - ratio of CT for L1, L2 L3
„ct-Iub ratio“ - ratio of a CT for current 4 (unbalance current)
“set stage” – stage is shown in the display in case of an trip / alarm
„display contrast“ - display contrast setting
“DI high active” – adjusts the behaviour of digital input (sensing for high or low signal)
"set time" –time and date for the integrated data storage

Technical Documentation
KSR-Z –Capacitor-Bank Protection Relay
Rev. 04
Page 16/36
3.3.2 Menu “setup->modbus”
This menu contains all MODBUS settings:
address - modbus slave address of the device
baudrate - data transfer speed over serial RS485 connection
parity - parity setting for serial connection
For details consult the separate technical documentation for KSR-Z Modbus.

Technical Documentation
KSR-Z –Capacitor-Bank Protection Relay
Rev. 04
Page 17/36
3.3.3 Menu “setup->relay”
Setup for the relays:
„normally open normally closed“ - this selects the relay inversion. If one chooses „normally
open“, the relay will be open in inactive state and it will close on activation. “normally closed”
inverts this behaviour.
„automatic reset manual reset“ - If a relay is set to “manual reset”, it will stay activated once it
has been triggered by an alarm or trip, even if the alarm or trip is inactive again (hold state). If
“automatic reset” is used, the relay will fall back to inactive state automaticallyonce the activating
alarms or trips have become inactive again.
„DI disabled DI enabled“ – If adjusted “DI enabled” a relay can be blocked via the digital input
to avoid accidentally trips

Technical Documentation
KSR-Z –Capacitor-Bank Protection Relay
Rev. 04
Page 18/36
3.3.4 Menu “setup->protection settings”
The following table gives an overview about the available alarms / trips in KSR-Z which are factory set:
Display
Protection
setting:
Monitored values:
Operated
Relay
Relay
N/C
Store in
FR
Blocked
by DI
Display
message
Auto
reset
Man.
reset
OL Alarm
TRMS current
L1, L2, L3
Relay 1
e
e
e
e
e
OL Trip
Relay 4
e
e
e
e
e
UL Alarm
TRMS current
L1, L2, L3
Relay 2
e
e
e
e
e
UL Trip
Relay 4
e
e
e
e
e
OL th
Alarm
Thermal damped
current
L1, L2, L3
Relay 1
e
e
e
e
e
OL th Trip
Relay 4
e
e
e
e
e
OL f Alarm
Fundamental
current
L1, L2, L3
Relay 1
e
e
e
e
e
OL f Trip
Relay 4
e
e
e
e
e
UB Alarm
Current channel 4
Relay 2
e
e
e
e
e
UB Trip
Relay 4
e
e
e
e
e
EF Alarm
Calculated earth
fault current
Relay 8
e
e
e
e
e
EF Trip
Relay 4
e
e
e
e
e
VA Alarm
Voltage asymmetry
between all phases
Relay 7
e
e
e
e
e
VA Trip
Relay 4
e
e
e
e
e
OV Alarm
TRMS voltage
L1-L2, L2-L3, L1-L3
Relay 7
e
e
e
e
e
OV Trip
Relay 4
e
e
e
e
e
UV Alarm
TRMS voltage
L1-L2, L2-L3, L1-L3
Relay 7
e
e
e
e
e
UV Trip
Relay 4
e
e
e
e
e
The procedure to enable an protection setting is equal for all available alarms. On the following page please
find the exemplary procedure for OL trip:

Technical Documentation
KSR-Z –Capacitor-Bank Protection Relay
Rev. 04
Page 19/36
Select
protection setting
by pushing + and
enable it by
pushing “ON”.
Before the protection
setting is enabled, the
allowed threshold must
be adjusted.
Use the button to
enter the remaining
settings. To open a input
mask us the button.
With the KSR-Z it is possible to select a adjustable delay time or one of 10
tripping characteristics by pushing “CURVE” respective “TIME”: 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
“OPTION” indicates which action shall follows
to the protection setting in case off exceeding
the adjusted threshold. In the table above all
this options are listed in factory settings. If
necessary of course they can be adapted.
Following options are possible
Figures: 1 –7 = Relay 1 –7
D = Display message
S = stored in fault recorder
X = Event blocked by DI
“T-RESET” additional timer to protect the capacitor bank against repetitive over
voltage or over current events. For further information’s check point 2.2.5
For the settings UB Alarm / UB Trip and EF
Alarm / EF Trip it’s possible to compensate the
natural unbalance respective natural EF current.
The proceed is shown below:
For Olth Alarm / Olth Trip it’s necessary to
adjust an value for tau. Over the adjusted tau
the thermal damping is calculated. For further
information check Appendix A
Natural unbalance compensation
Thermal Tau
Select item “UB COMP”
and set the
compensation by
pushing the button.
To reset “UB COMP” the
procedure is equal.
Select item “TAU” and
open the input mask by
pushing the I button.
Enter the value and
confirm by pushing
button.

Technical Documentation
KSR-Z –Capacitor-Bank Protection Relay
Rev. 04
Page 20/36
3.3.5 Menu “setup ->set password”
This submenu allows to change password from factory setting (2402) to customer requirement. If
no password protection is required, adjust the password to 0000 no password is required.
3.3.6 Menu "setup -> clear faultrecorder"
This function allows to delete the content of the storage cells from the fault recorder.