KEHUI T-710 User manual

T-710Intelligent Cable Identifier
User Manual
Kehui International Ltd.
2 Centrus, Mead Lane, Hertford
Hertfordshire, SG13 7GX
United Kingdom
Phone: [phone]
Fax: [phone]
Website: http://kehui.com

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Legal Notices
The copyright of this material belongs to Kehui International Ltd. No company or individual
may extract, copy or translate in any way without the written permission of the copyright
owner.
Copyright infringement will be investigated.
This product complies with the design requirements for environmental protection and
personal safety. It is a professional instrument specially designed for power cable
identification and should not be used for any other purpose. The company assumes no
responsibility or loss if it is used incorrectly.
The safety regulations in this user manual should be strictly adhered to.
The storage, use and disposal of the product should be in accordance with the product
manual, relevant contracts or relevant laws and regulations.
As part of Kehui’s continual product development this product is subject to design or
technical changes without prior notice.
Revision history
Data version
Revision date
Revision reason
Person
Version 1.0
December 2020
First issue
D Kibart / W Kibart
Document number: T-710_UM_EN_V1.0

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Foreword
Thank you for purchasing the T-710 intelligent cable identification device.
The T-710 is a light-weight, high power device for accurately identifying a specific cable
from a group of adjacent cables and is a complementary product to the Kehui range of
cable fault location equipment.
In order to ensure that you use the instrument to full advantage, always read the
instructions carefully before using.
Kehui is constantly improving its products, and the individual instruments provided may
differ from the instructions in this manual without prior notice. We are always at your
service if you have any queries or should you require further information.
Please do not attempt to repair or adapt the device, as this will invalidate the warranty. If
you encounter any problem with it contact us on: inf[email protected]m

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Table of Contents
1. SAFETY INSTRUCTIONS .....................................................................................5
2. GENERAL DESCRIPTION.....................................................................................6
2.1 GENERAL ...........................................................................................................6
2.2 FEATURES..........................................................................................................6
2.3 SPECIFICATION..................................................................................................7
2.4 DEVICE COMPOSITION AND ACCESSORIES.......................................................8
3. SIGNAL TRANSMISSION METHODS...................................................................9
3.1 INTRODUCTION TO THE TWO OPERATING METHODS .....................................9
3.2 WIRING AND OPERATION FOR DIRECT CONNECTION....................................10
3.3 WIRING AND OPERATION OF CLAMP COUPLING METHOD ...........................12
4. CONNECTION MODES FOR CABLE IDENTIFICATION.......................................14
4.1 OUT OF SERVICE CABLE WIRING METHOD.....................................................15
4.2 LIVE CABLE WRING METHOD..........................................................................18
4.3 TRANSMISSION FREQUENCY SELECTION IN CABLE DETECTION.....................19
5. SMART CABLE IDENTIFICATION ......................................................................20
5.1 SELECTION OF SIGNAL TRANSMISSION METHOD...........................................20
5.2 RECEIVER FLEXIBLE SENSOR CONNECTION.....................................................20
5.3 INTRODUCTION TO THE RECEIVER INTERFACE...............................................20
5.4 CALIBRATION...................................................................................................21
5.5 CABLE IDENTIFICATION...................................................................................22
6. POWER FREQUENCY CURRENT MEASUREMENT............................................26
6.1 INTERFACE INTRODUCTION............................................................................26
6.2 POSITION ERROR.............................................................................................26
7. TRANSPORTATION AND STORAGE..................................................................27
7.1 TRANSPORTATION CONSIDERATIONS ............................................................27
7.2 STORAGE CONDITIONS AND PRECAUTIONS...................................................27
8. UNPACKING INSPECTION, MAINTENANCE AND WARRANTY .........................27
8.1 INITIAL CHECKS ...............................................................................................27
8.2 MAINTENANCE................................................................................................27
8.3 WARRANTY......................................................................................................28
8.4 PACKING LIST: .................................................................................................29

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1. Safety Instructions
Safety Note: This user manual is the basic commissioning and on-site operation
guide for the T-710 Intelligent Cable Identifier. Any operator who uses the T-710
should read the entire contents of this manual in advance. The manufacturer of this
product is not responsible for the loss caused by the operator's failure to comply
with the operating procedures of this manual or for violation of the safe working
procedures of the operator.
Meaning of the manual symbols: Important instructions concerning personal safety,
operating procedures, technical safety, etc., are marked with the following symbols:
Symbol
Meaning
Indicates a potential hazard that could result in fatal
or serious injury
Indicates a potential hazard which, if not avoided, may
result in minor personal injury or property damage.
Indicates that it contains important information and
useful guidance for using this product. Failure to heed
this information will result in the test not functioning
properly.
Indicates that this is a useful guideline based on field
practice.
Use of accessories: Kehui’s spare parts must always be used to ensure the safe and
reliable use of this instrument. Using accessories made by other companies will
make any warranty null and void.
Repair and maintenance: This instrument must be repaired and maintained by
Kehui or an agent authorised by Kehui. If you have any questions such as
maintenance, cable fault detection, on-site test consultation, etc., please contact;
[email protected]
Earthing / grounding: In English speaking markets the words earthing and
grounding are synonymous for an electrical connection to the mass of earth. For
simplicity, this manual uses the term earthing throughout.

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2. General Description
2.1 General
T-710 is a high-performance cable identification system, composed of a signal
transmitter T-710T and receiver T-710R. It is used to accurately identify the target
cable among multiple cables. It is suitable for live and uncharged cables, including
three-core cables with armour.
2.2 Features
•High-power, multi-level, adjustable output
•The unique identification of the cable, the result is accurate and reliable
•Automatic impedance matching, and protection
•Two signal output modes: direct output and clamp coupling
•Digital, high-precision sampling and processing, extremely narrow receiving
frequency band and strong anti-interference ability
•Built-in large-capacity lithium-ion battery pack, automatic shutdown on under-
voltage and after long periods on non-operation
•Clear identification of cable
•Lightweight, sturdy housing
•Suppression of power frequency and harmonic interference from adjacent
cables and pipelines.
Fig. 2.1 device appearance

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2.3 Specification
2.3.1 Transmitter
•Output frequency: 640Hz or 1280Hz (Composite frequencies)
•Output power: max 10W in 10 steps with automatic impedance matching
•Output voltage: maximum 150V (peak to peak)
•Overload/short circuit protection
•User interface: 320 x 240 pixels LCD
•Internal battery: Four 18650, 7.4V, 6.8 Ah
•Dimensions 280 x 220 x 90mm
•Weight 2.3Kg
•Operating temperature: -10oC to +40oC
•Relative humidity: 5 –90%
2.3.2 Receiver
•Input mode: Flexible sensor
•Active detection frequency 640Hz, 1280Hz
•Passive detection system frequency 50/60Hz (configurable)
•Current measurement: 1 –1000A ±3% AC
•HMI: 800 x 480 pixels LCD
•Battery: Two 18650, 3.7V 6.8Ah
•Dimensions: 220 x 125 x 55mm
•Weight 0.9kg
•Operating temperature: -10oC to +40oC
•Relative humidity: 5 –90%

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2.4 Device composition and Accessories
2.4.1 Transmitter
① LCD Display
⑥ Output frequency increase
② Keypad
⑦ Output power increase
③ Output port
⑧ Output frequency decrease
④ Charging socket
⑨ Output power decrease
⑤ Reset output
⑩ Power on/off
Figure 2.2 Transmitter overview
2.4.2 Receiver
① Output port
⑤ Power on/off
② LCD display
⑥ Calibration key
③ Charging port
⑦ Output frequency decrease
④ Charging socket
⑧ Output frequency increase
Figure 2.3 Receiver overview

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2.4.3 Receiver LCD display
Figure 2.3 Receiver display
3. Signal Transmission Methods
Before making any contact with electrical cables, ensure that the supply is switched
off and the cable is discharged.
There are two methods for the transmitter to transmit signals to the cable: direct
connection and clamp coupling.
3.1 Introduction to the two operating methods
3.1.1 Direct connection method
Using the direct connection method, the output line of the transmitter is directly
connected to the metal cable, in order to inject the signal.
Compared with other methods, the direct connection method produces the largest
current output and so, if conditions permit, it should be used wherever possible.
3.1.2 Clamp coupling
The clamp coupling method is suitable where the cable is exposed, but the conductor
cannot (or is not allowed to) be touched, and both ends of the cable are earthed.
The advantage of the clamp coupling method for transmitting signals is that it is easy
to use, requires no electrical connection to the cable, does not have any impact on
its normal operation and can reduce induction to other cables; the disadvantage is
that the coupled current is less than in the direct connection method and it requires
both ends of the cable to be well earthed.

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3.2 Wiring and operation for direct connection
Step 1: Insert the 5-pin red plug on the output cable directly into the output socket
of the transmitter.
Figure 3.1 Direct connection cable
Step 2: Disconnect the sheath at both ends of the cable, remove the sheath and
neutral earthing.
Step 3: Attach the red clip to a healthy conductor, and the black clip to the earth
through the earthing rod. At the opposite end of the cable, connect the other end of
the connected conductor with the earthing rod inserted in to the ground.
For the near end it is preferable to use the earthing rod rather than the earth grid
network. At the far end, the earthing rod must be used and should be away from the
earthing network. Otherwise, the flow of current through the earth grid will affect
the results.
Connect the red crocodile clip to the exposed core conductor or sheath of the cable;
the black crocodile clip is connected to the earthing pin that is driven into the ground
(soil). If the cable is not long enough, an extension cable can be used.
Figure 3.2 Directly connected to the cable core
Observe the following points:
•Make sure that all connections are solidly made. If there is any insulating coating or
rust on the joint, clean it before connecting the red crocodile clip.
•In order to ensure the detection effect, the earthing pin should be at least 5m away
from the cable, and the black earthing wire should be as perpendicular to the
pipeline as possible.
•Do not connect the black earth wire to a pipe, or there will be transmission signals
induced in it, which will interfere with the normal detection of the target cable.
•There should be no other cables or pipelines between the earthing pin and the
target cable, otherwise the transmission signal will be induced on them, which will
cause interference.