Nortroll CableTroll 210 User manual

Userguide CableTroll 210 March 2020 010121000/11/12/13
CableTroll210
User Guide for product nr. 01021000/11/12/13

Userguide CableTroll 210 March 2020 010121000/11/12/13
This document describes the installation and configuration of the
CableTroll 210, product number: 01021000, 01021011, 01021012 and
01021013 fault indicator for underground cable networks.
Revision no
Date
Description
1st Draft
09.03.18
Spec generation 5 EFI, TNB specification
1
01.04.18
Correction of connection diagram
2
23.04.18
Correction of text page 5 & 14
3
19.12.18
New illustration front page
4
23.07.19
PCB drawing corrected
5
19.08.19
Illustrations updated
6
20.09.19
Programming table updated
7
25.09.19
Technical drawing with dimensions updated
8
15.09.19
Updated with Rogowski coil sensor
9
28.01.20
Pictures updated with black Rogowski coil
10
02.03.20
Illustrations and pictures updated
Information in this document is subject to change without notice.
No parts of this documentation may be reproduced in any form by any means without the written permission of Nortroll AS.
Copyright ©2006 Nortroll AS. All rights reserved. All Nortroll products are trademarks or registered trademarks of Nortroll AS.
Other product names are trademarks or registered trademarks of their respective holders.
©2006 NORTROLL AS
P.O.Box 133
7601 Levanger
Norway
www.nortroll.no

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Userguide CableTroll 210 March 2020 01021000/11/12/13
Contents
CONTENTS.............................................................................................................................................3
1. INTRODUCTION ...............................................................................................................................4
1.1 DEFINITIONS ....................................................................................................................................4
2. TECHNICAL DESCRIPTION ..........................................................................................................5
2.1 GENERAL DESCRIPTION....................................................................................................................5
2.2 INDICATION .....................................................................................................................................5
2.3 REMOTE CONTACT...........................................................................................................................5
2.4 ROGOWSKI COIL/CURRENT TRANSFORMER (CT)/ EARTH-FAULT ELEMENT.....................................5
2.5 HOUSING..........................................................................................................................................5
2.6 GLANDS...........................................................................................................................................5
2.7 RESETTING INDICATION OPTIONS.....................................................................................................5
2.8 POWER SUPPLY................................................................................................................................5
2.9 NFC, NEAR FIELD COMMUNICATION ..............................................................................................5
3. FUNCTIONAL DESCRIPTION........................................................................................................6
3.1 FAULT CURRENTS IN CABLE NETWORK ............................................................................................6
3.2 CAPACITIVE DISCHARGE CURRENTS................................................................................................6
3.3 EARTH FAULT DETECTION................................................................................................................7
4. APPLICATION/MOUNTING ...........................................................................................................8
4.1 SENSOR MOUNTING.........................................................................................................................8
5. BATTERY STATUS ...........................................................................................................................8
5.1 LOW BATTERY (LITHIUM BATTERY).................................................................................................8
5.2TO REPLACE THE BATTERY .............................................................................................................9
5.3 RESETTING BATTERY COUNTER .......................................................................................................9
6. CONNECTION DIAGRAM.............................................................................................................10
6.1 MAIN PCB.....................................................................................................................................10
7. SETTINGS/PROGRAMMING CT 210 ..........................................................................................11
7.1 SETTING TRIP LEVEL. .....................................................................................................................11
7.2 SETTING RESPONSE TIME/SIGNAL TIME DELAY..............................................................................12
7.3 SETTING TIMER RESET...................................................................................................................12
7.4 SETTING AUTO RESET....................................................................................................................12
7.5 SETTING CB TRIPPING AND INRUSH BLOCKING. ............................................................................12
8. TEST AND RESET ...........................................................................................................................13
8.1 TEST-RESET BUTTON:....................................................................................................................13
8.2REMOTE RESET ..............................................................................................................................13
8.3 AUTO RESET...................................................................................................................................13
9. TECHNICAL SPECIFICATIONS ..................................................................................................14
11 DIMENSIONS ..................................................................................................................................15
11.1 HOUSING......................................................................................................................................15
11.2 SPLIT-CORE ROGOWSKI COIL/CT.................................................................................................15

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Userguide CableTroll 210 March 2020 01021000/11/12/13
1. Introduction
The CableTroll 210 is a fault current detector for the underground medium voltage distribution network
(6-36kV). It is used to detect earth faults according to the functional principles in chapter 3. It can be
installed on most types of cable terminations and suitable for use in tropical weather conditions with
high humidity of 65% to 95%. The CableTroll 210 will indicate earth faults locally by a flashing diode,
and remotely through a relay contact.
1.1 Definitions
As the terminology may differ from country to country, we will throughout this presentation use the
following definitions:
Earth fault: - Single phase to ground fault (PtG)
1.2 Typical Fault Situation
132kV/22kV
22kV/220V
SLEEPING INDICATORS
FLASHING INDICATORS
22kV/220V
22kV/220V
Figure 1. Fault indicator status following a fault

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Userguide CableTroll 210 March 2020 01021000/11/12/13
2. Technical description
2.1 General description
The indicator comprises one pcb cards mounted in an enclosure with hinched front cover
(consist of 3 LED’s) for access to terminal blocks, battery and dip switches. Both control & signalling is
combined in one box.
Prod. Nr 01021000/11/12/13
2.2 Indication
One main high visibility red LED (visibility >10meters) for earth fault indication.
2 additional smaller LED’s (Green & Red/Amber) for battery status indication.
2.3 Remote contact
Relay contacts (for remote signalling) for Earth fault and Low battery
Latched voltage free contact relay. One Normally Open (NO) and one Normally closed (NC)
Pulse relay may be available from factory on request.
2.4 Rogowski coil/Current Transformer (CT)/ Earth-fault element
The indicator uses one direct type Rogowski coil for detection of earth faults only.
2.5 Housing
Housing designed for outdoor mounting.
2.6 Glands
Two cable glands gland are included with the indicator.
2.7 Resetting Indication options
Programmable timer (DIP Switch)
Automatic reset by voltage (230VAC) or from CT (imbalance ˃3A)
Supervisory Reset from SCADA (Immediate/2sec)
Manual reset by a push-button located on the front of the indicator.
2.8 Power Supply
Internal 3,6Ah/3,6V long life lithium battery for up to 10 years operation
2.9 NFC, Near Field Communication
The CT 210 has NFC for collecting info from the indicator such as Firmware version, Serial Number,
Programming/Dip-switch settings, battery status, fault counter and link to valid Mounting Instruction.

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Userguide CableTroll 210 March 2020 01021000/11/12/13
3. Functional description
3.1 Fault currents in cable network
The short circuit current magnitude is mainly given by voltage level, type of transformer, primary feeding
network and the distance from the feeding transformer to the fault location.
A cable short circuit will normally cause a fault current in the kA-range. When short circuit appears near
the end of a long line, the fault current is most likely to be of a significantly lesser value.
In networks with directly earthed neutral an earth fault is equivalent to a phase-to-earth short circuit.
The current magnitude will in this case be almost equal to the fault current of a phase-to-phase short
circuit.
For networks that do not have a directly earthed neutral, the magnitude of the singular earth fault
current is determined by the size of the galvanically interconnected network, the voltage level, type of
cable and the neutral equipment.
The magnitude of a fault current during a dual earth fault will be almost equal to a short circuit in
networks that do not have a directly earthed neutral.
IMPORTANT:
As the sensor principle is of the threshold type, correct use of the indicator is subject to calculations of
earth fault currents and capacitive discharge currents through the sensor element (seen from the
feeder).
The capacitive discharge current from behind the Rogowski coil/CT/earth fault element must not exceed
the trip level setting of the indicator.
The capacitive discharge current will vary between the different types of cable, and the cable supplier
should be consulted about the data for your specific type in order to make the correct calculations.
In compensated networks, the earth fault detection may not be possible in certain locations depending
on the degree of compensation.
3.2 Capacitive Discharge Currents
The CableTroll 210 series indicators is not directional, (see CableTroll 3500 for directional) it therefore
detects current without discriminating its direction. In case of an earth fault, the network capacitive
energy discharges in the fault point.
It should be checked that the capacitive discharge current downstream the indicator is below pre-set trip
level in order to avoid the indicator erroneously activating upon earth faults. If the total capacitive
current exceeds the trip level, it is advisable to change the trip level or install the indicators in the
branching points instead of in the main line.
The capacitive discharge of a branching point is limited by its own capacitance, while in the main line
the capacitive current of all the branches downstream the indicator is added.
Underground cables have larger capacitance than overhead lines. This must be considered when an
overhead line feeds an underground cable and vice versa.

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Userguide CableTroll 210 March 2020 01021000/11/12/13
The following simplified formula may be used to estimate the capacitive discharge current of a line:
Ic = U * La +U * Lc
300 K
Ic = Capacitive current in A
U = Nominal voltage in kV
La = Overhead line length in km
Lc = Cable length in km
K = 10 for oil impregnated cables
5 for PEX cables
3 for PVC cables
In order to avoid that the CableTroll 210 is activated by an earth fault downstream of the indicator, the
following criterion must be met.
Ic < It
where
Ic = capacitive current down-stream of the indicator.
It = CableTroll 210 programmed trip-level sensitivity.
To estimate the capacitive discharge current at any line point, you must calculate the contribution from
all the overhead lines and underground cables lengths only beyond (down-stream) that point.
Figure 3. Capacitive discharge current calculation example
The indicator will start to flash when a current exceeding the programmed overcurrent threshold occurs.
3.3 Earth fault detection
When the vectoral sum of the cable currents exceeds the trip level setting. (With no earth fault this sum
is close to zero). Both transient and permanent faults are treated in the same way.

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Userguide CableTroll 210 March 2020 01021000/11/12/13
4. Application/Mounting
4.1 Sensor Mounting
The Rogowski Coil/Current transformer should be mounted between the end termination and the point
where the cable screen is extracted. The CT may be mounted on the screened part of the cable. The
screen should then be fed back through the Rogowski Coil/CT to prevent earth fault currents or screen
transients exceeding the trip level setting and activating the indicator erroneously.
Product number: 01021000/11/12/13
Rogowski Coil/Current Transformer Mounting.
5. Battery Status
5.1 Low battery (Lithium battery)
When there is less than 20% remaining capacity on the battery, the low battery relay will close and
remain closed until battery counter is reset.
Pushing the Test-/Reset button for less than 1 sec., the battery status LED will indicate the status of the
Lithium battery.
Alternating Red and Green flash: Battery OK
Red flash only: Less than 20% remaining capacity.
The power consumption during idle and flashing is stored in the EFI and can be read with a cellphone
with a NFC function (Near Field Communication).
Battery Status LED

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Userguide CableTroll 210 March 2020 01021000/11/12/13
5.2 To Replace the Battery
The internal battery should be changed every 10 years/1000 hours or if Battery Status LED is illuminated
Red/Amber when pressing the test button. If so, battery should be changed immediately.
1. Open front cover.
2. Remove battery.
3. Fit new battery into place NOTE: Notice battery polarity
4. Reset battery counter (ref section 5.3)
5.3 Resetting battery counter
When the battery has been replaced the battery counter must be reset. This is done by pushing the
Test-/Reset button and hold it pressed for more than 30 seconds.
Observe the following sequence:
•Push the Test-/Reset button and hold for 30 seconds.
•During the 30 seconds the green Led will flash after 0.5sec, 2sec, 5sec. and after 30 seconds.
•Release the Test-/Reset button.
•The Red/Amber and Green LED light up simultaneously.
•Within 5 sec., push and release the Test-/Reset button again.
•Successful resetting of battery counter will be indicated by Red/Amber and Green LED flashing
simultaneously for some time (more than 5 seconds).
The battery counter has now been reset.
S2: Test/Reset
Reset of Battery counter

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Userguide CableTroll 210 March 2020 01021000/11/12/13
6. Connection Diagram
6.1 Main PCB
Remove the screw to open front cover. The front cover is hinged and will remain upright when the cables
are connected, and the dip switches are set.
Connection diagram CT210
Terminal from left:
1: Mains reset (220-240VAC)
2: Mains reset (220-240VAC)
3: SCADA reset (9-110VDC) Hot/+
4: SCADA reset (9-110VDC) Ground/-
5: LED-6 Red (+)
6: LED-6 Black (-)
7: Earth fault Relay 1 (NC1)
8: Earth fault Relay 1 (NO1)
9: Relay Common
10: Shield/Screen
11: CT/Rogowski coil current sensor
12: CT/Rogowski coil current sensor
13: Low battery Relay 2, (NC2)
14: Low battery Relay 2, (NO2)
S1: Reset button (hard reset)
S2: Test/Reset
SW1: Trip Level/Settings/programming