EA Technology HFCT1 User manual

MANUAL
HFCT Operating Manual
Model No: HFCT1
Document Version: V01.00.03
Date: 12 August 2021

3534-MANUL-V01.00.03 HFCT1 Operating Manual
All rights reserved. No part of this publication may be reproduced or transmitted in any form or by any means electronic, mechanical,
photocopied, recorded or otherwise, or stored in any retrieval system of any nature without the written permission of the copyright holder.
© EA Technology Ltd April 2021
EA Technology Limited, Capenhurst Technology Park, Capenhurst, Chester, CH1 6ES;
Tel: [phone] Fax: [phone]
http://www.eatechnology.com
Registered in England number 2566313
Version History
Date
Version
Author(s)
Notes
01/03/2021
01.00.00
Sam Russell
Initial Release
06/04/2021
01.00.01
01.00.02
Jo Cahill
Minor formatting
12/08/21
01.00.03
Sam Russell
Replaced DoC Section with online
reference to both UKCA and CE DoCs.

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Safety Precautions and procedures
•The HFCT range is for use only with specified equipment and cables supplied by EA Technology.
Misuse of the equipment can result in injury or death.
•Before installation and use, always check the condition of the connecting cable.
•The HFCT can be installed without de-energizing the local equipment, it must be considered under the
relevant risk assessment.
•Do not apply around or remove the HFCT from UNINSULATED HAZARDOUS LIVE conductors, which
may render electric shock, electric burn, or arc flash.
•The HFCT is designed for the measurement of conductors at earth potential only.
•If a HFCT has been heavily saturated for a long enough period, the HFCT jaws (ferrite core edges)
may have risen in temperature, when handling a HFCT avoid touching the jaws where possible.
•The installation environment of HFCTs must be considered before installation, this includes the
ambient environment and building conditions along with other local hazards.
•Local safety procedures and guidelines (including the use of personal protective equipment) must be
followed during the installation and use of the HFCT.
•ALWAYS terminate the HFCT into a measurement device before commissioning the HFCT.
•Do not use the HFCT outside of its specified rated values (including saturation current).
•If the equipment is used in a manner not specified by the manufacturer, any protection provided by
the equipment may be impaired.
•Modification of switchgear is outside the scope of this document. Adhere to all regulatory and
manufacturer standards when considering modifications. Ensure that any such modifications do not
reduce structural integrity or arc flash withstand of the switchgear.
•For application information email [e-mail].
Relevant Safety Symbols
Do not apply around or remove from UNINSULATED HAZARDOUS LIVE
conductors, which may render electric shock, electric burn, or arc flash.
Caution, documentation must be consulted before installation, use, or
decommissioning.

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Contents
1. General Description....................................................................................................................................................1
2. Preparations for Use ..................................................................................................................................................2
3. Maintenance................................................................................................................................................................4
4. HFCT1-F50 Technical Specification .......................................................................................................................5
5. HFCT1-F100 Technical Specification.....................................................................................................................7
6. Sales and Service........................................................................................................................................................9
7. HFCT1-F Declaration of Conformity .................................................................................................................... 10

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1. General Description
This document provides safety information, specifications, and guidelines for using the High-Frequency Current
Transformer (HFCT). HFCTs are designed to detect small high-frequency pulses on ground lines caused by
partial discharge events whilst attenuating any circulating 50 Hz currents. The HFCT1-F range is a split toroid
arrangement and comes in two aperture size variants (50 and 100mm) allowing for easy clamping around
insulated cables. The HFCT1-F100 comes with a rubber insert for the aperture with a range of diameters to
support the HFCT around the measured conductor and improve accuracy for smaller cable sizes.
Measurements from the HFCT can be taken from the insulated BNC connection when connected to a specified
EA Technology product such as the UltraTEV®Plus²(UTP2) or UltraTEV® Monitor Cable PD Node (UTMN1-CPD).
Figure 1 HFCT1-F50
Figure 2 HFCT1-F100

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2. Preparations for Use
2.1 Installation
Installation requirements can vary but the HFCT allows for easy installation due to its non-invasive ability to
clamp around a cable. The HFCT should only be installed by competent persons with the required work permits
for the environment of the installation. This document offers guidance on the installation procedure. For
assistance regarding installation, contact EA Technology.
2.1.1 Pre-Connection/Disconnection Assessment
A risk assessment should always be carried out dependant on the installation environment. HFCTs by nature
will be installed within dangerous locations such as substations and these should have their own risk
assessments and procedures in place and must be followed. Certain environments such as installation within
cable chambers on switchgear may require the system to be proven de-energised amongst other requirements,
in case of doubt when installing contact the manufacturer.
2.1.2 Connecting/Disconnecting the HFCT procedure
A visual inspection for signs of damage to the HFCT and connecting cables is to be carried out. Connect the
supplied HFCT cable to the measurement device as specified in the relevant equipment manual, push and twist
the cable connector into the BNC on the HFCT until the cable is locked in place. To disconnect the HFCT, gently
push and twist before pulling the BNC connector off. The HFCT must always be terminated into the
measurement device before clamping/unclamping the HFCT around a measurement point, failure to do so
increases the risk of electric shock.
2.1.3 HFCT Mounting Guidance
The HFCT1-F50 and HFCT1-F100 each have three mounting holes that can be utilised for permanent
installations and secured using either cable ties or screws. Before installation, the best method for mounting
the HFCT in the associated environment should be considered. For more repeatable readings keeping the
conductor being measured central in the aperture of the HFCT is advised. The HFCT1-F100 comes with a rubber
insert which can help when measuring smaller conductors down to 50mm, any smaller and the HFCT1-F50
should be used in place of the HFCT1-F100.
If permanent installation of HFCTs is being considered, contact Product Support for guidance notes.

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2.1.4 HFCT Configurations for Installation
Before starting an install, ensure parts 2.1.1 to 2.1.2 have been completed. The HFCT is best installed by directly
mounting around an earth cable, if this is not possible alternative configurations are listed below, for more
guidance contact the manufacturer.
Connections can be made:
1. By monitoring the earth cable only (Figure 3), this is the preferred connection method.
2. By monitoring the line conductor without the earth (Figure 4) or,
3. By monitoring the line conductor and earth within the sheathing and the earth cable external to the
sheathing when passed back through the HFCT (Figure 6).
If the HFCT is placed over both the line conductor and earth cable at the same time, the discharge currents
are cancelled (Figure 5). The method to counter this effect is shown in Figure 6.
Figure 3
Figure 4
Figure 5
Figure 6

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3. Maintenance
Calibration
No regular maintenance or calibration is required for the HFCT.
Cleaning and Storage
The HFCT should be stored in clean and dry conditions. If cleaning is deemed necessary, it is advised to
disconnect the HFCT as per 2.1.2 and clean with a damp cloth (do not use harsh chemicals) with the HFCT
closed shut. No attempt to gain access to the internal circuitry should be made. If any doubt exists, contact the
manufacturer. The HFCT can become damaged by dropping and care should be taken to ensure the HFCT is
secured and handled correctly. The core of the HFCT can fracture internally without visible effects, if damage
is suspected due to an impact, contact the manufacturer.
Waste electrical and electronic equipment directive (WEEE)
EA Technology is a member of an approved compliance scheme as defined by the WEEE directive. When an
EA Technology product reaches the end of its operational life, it must be recycled by a licensed waste
management operator or returned to EA Technology for recycling.

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4. HFCT1-F50 Technical Specification
Wideband Frequency Response and Range
Nominal Low Frequency -3dB Point
1 MHz
Nominal High Frequency -3dB Point
70 MHz
Nominal Sensitivity
8.5 V/A
Standalone Minimum Pulse Detection
10pC
Nominal Accuracy
+/- 1V/A
Terminating impedance
50 Ohm
Enclosure Insulation Rating
CAT IV (150V)
50Hz Response and Saturation
Saturation Current at 50Hz
> 100 A
50Hz Frequency Response
< -70 dB
Hardware
Enclosure Aperture Diameter
48 mm
Enclosure Diameter
101 mm
Enclosure Depth
22 mm
Clamping Mechanism
Magnetic / Cable Tie
Connection
Insulated BNC (female)
Mounting Capability
3x M5 Mounting Holes
Enclosure Impact Rating
IK08
Environmental
Temperature
-20 to 50°C
Humidity
0-80%RH
IP Rating
IP2X

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HFCT-F50 Frequency Response
Figure 7 HFCT1-F50 Response Curve
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
5.5
6
6.5
7
7.5
8
8.5
9
9.5
10
100 1000 10000 100000
Sensitivity (V/A)
Frequency (KHz)
HFCT1-F50 Frequency Response

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5. HFCT1-F100 Technical Specification
Wideband Frequency Response and Range
Nominal Low Frequency -3dB Point
0.8 MHz
Nominal High Frequency -3dB Point
80 MHz
Nominal Sensitivity
8.5 V/A
Standalone Minimum Pulse Detection
10pC
Nominal Accuracy
+/- 1V/A
Terminating impedance
50 Ohm
Enclosure Insulation Rating
CAT IV (150V)
50Hz Response and Saturation
Saturation Current at 50Hz
> 100 A
50Hz Frequency Response
< -70 dB
Hardware
Enclosure Aperture Diameter
94 mm
Enclosure Diameter
158 mm
Enclosure Depth
33.5 mm
Clamping Mechanism
Metal Clamp / Cable Tie
Connection
Insulated BNC (female)
Mounting Capability
3x M5 Mounting Holes
Enclosure Impact Rating
IK08
Environmental
Temperature
-20 to 50°C
Humidity
0-80%RH
IP Rating
IP2X

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HFCT-F100 Frequency Response
Figure 8 HFCT1-F100 Response Curve
HFCT Enclosure Dimensions
HFCT1-F50 Dimensions
HFCT1-F100 Dimensions










0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
5.5
6
6.5
7
7.5
8
8.5
9
9.5
10
100 1000 10000 100000
Sensitivity (V/A)
Frequency (KHz)
HFCT1-F100 Frequency Response

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6. Sales and Service
Head Office
EA Technology Ltd
Capenhurst Technology Park
Chester, UK, CH1 6ES
Tel: [phone]
For details of EA Technology’s international offices and distributors, please visit our website:
www.eatechnology.com/contact-us/corporate-offices
Sales
Email: [e-mail]
Product Support
Email: product-sup[email protected]
Tel: [phone]
Warranty Policy
What Does the Warranty Policy Cover?
EA Technology products and accessories are warranted against defects in material and workmanship. During
the warranty period, EA Technology will, at its option, either repair or replace products, parts or accessories
which prove defective.
What is Not Covered by the Warranty Policy?
The following are not covered: damage caused by accident, misuse, abuse, product modification or neglect;
damage resulting from failure to follow instructions contained in your operating manual; damage resulting
from the performance of repairs by someone not authorised by EA Technology.
Warranty Policy for Repairs
Repaired products are warranted against defects in workmanship and materials for a period of six months, or
the remainder of the original warranty period, whichever is greater.
Continuous Improvement
EA Technology has a policy of continual product development and enhancement. Consequently, there may be
minor variations in specifications or operation that are not covered in this operating manual.
Every effort has been made to ensure that the information provided in this operating manual is accurate at the
time of going to print.
If any errors or omissions are noticed, please notify: [e-mail]

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7. HFCT1-F Declaration of Conformity
Hereby,EA Technology declares that the equipment described in this document is in compliance with all
applicable EU Directives and UK Statutory Instruments.
The full text of the EU and UK declarations of conformity are available at the following internet address:
www.eatechnology.com/declaration
Claims of compliance made in any document other than the relevant declaration of conformity are for
guidance only.

Safer, Stronger, Smarter Networks
EA Technology Limited
Capenhurst Technology Park
Capenhurst, Chester CH1 6ES
t [phone]
e [email protected]
www.eatechnology.com