HVTest HT-TC Bedienungsanleitung
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Dear Client
Thank you for Purchasing our HT-TC Cable Fault Locator.
Please read the manual in detail prior to first use, which will help
you use the equipment skillfully.
Our aim is to improve and perfect the
company's products continually, so there may be
slight differences between your purchase equipment
and its instruction manual. You can find the changes
in the appendix. Sorry for the inconvenience. If you have further
questions, welcome to contact with our service department.
The input/output terminals and the test column
may bring voltage, when you plug/draw the test wire or
power outlet, they will cause electric spark. PLEASE
CAUTION RISK OF ELECTRICAL SHOCK!
Company Address:
T4，No. 41, High-tech 2 Road，East Lake High-tech Development Zone，
Wuhan
Sales Hotline: 86-27- 87457960
After Service Hotline:86-27- 87459656
Fax: 86-27- 87803129
E-mail: [email protected]
Website: www.hvtest.cc
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SERIOUS COMMITMENT
All products of our company carry one year limited warranty
from the date of shipment. If any such product proves defective
during this warranty period we will maintain it for free. Meanwhile
we implement lifetime service. Except otherwise agreed by
contract.
SAFETY REQUIREMENTS
Please read the following safety precautions carefully to avoid
body injury and prevent the product or other relevant subassembly
to damage. In order to avoid possible danger, this product can only
be used within the prescribed scope.
Only qualified technician can carry out maintenance or repair
work.
--To avoid fire and personal injury:
Use Proper Power Cord
Only use the power wire supplied by the product or meet the
specification of this produce.
Connect and Disconnect Correctly
When the test wire is connected to the live terminal, please do
not connect or disconnect the test wire.
Grounding
The product is grounded through the power wire; besides, the
ground pole of the shell must be grounded. To prevent electric
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shock, the grounding conductor must be connected to the ground.
Make sure the product has been grounded correctly before
connecting with the input/output port.
Pay Attention to the Ratings of All Terminals
To prevent the fire hazard or electric shock, please be care of
all ratings and labels/marks of this product. Before connecting,
please read the instruction manual to acquire information about the
ratings.
Do Not Operate without Covers
Do not operate this product when covers or panels removed.
Use Proper Fuse
Only use the fuse with type and rating specified for the product.
Avoid Touching Bare Circuit and Charged Metal
Do not touch the bare connection points and parts of energized
equipment.
Do Not Operate with Suspicious Failures
If you encounter operating failure, do not continue. Please
contact with our maintenance staff.
Do Not Operate in Wet/Damp Conditions.
Do Not Operate in Explosive Atmospheres.
Ensure Product Surfaces Clean and Dry.
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－Security Terms
Warning: indicates that death or severe personal injury may
result if proper precautions are not taken
Caution: indicates that property damage may result if proper
precautions are not taken.
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CONTENTS
Ⅰ. Product introduction........................................................................... 6
Ⅱ. Product features and technique parameters................................. 7
Ⅲ. Low Voltage Impulse Testing Method.............................................9
IV. High Voltage DC Flashover Method............................................. 11
V. High Voltage Impulse Flashover Method...................................... 12
VI. Fundamantal Principle and Composition..................................... 13
VII. Panel Controlling and Keymanual’s Function............................ 15
VIII. Instrument use fault test method................................................. 16
IX. Announcement..................................................................................22
X. Packing list..........................................................................................24
XI.Common fault repair..........................................................................24
Appendix.................................................................................................. 25
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Ⅰ. Product introduction
The normal operation of cable-communication and electric
transport completely rely on the good condition of the
cable-circuit. Once the circuit breaks down and without
punctually examination and repairing, it will no doubt trigger the
mass economic loss and bad social influence. So the electric
fault measuring testing instrument is a very important tool. The
intellectual testing instrument uses multiple testing methods
and adopts the most advanced electronic devices and with
computer and special electronic technology, combining our
company’s successful experience of long-time exploitation on
cable-fault measuring testing instruments, and it is absolutely of
high tech, intelligence and abundant functions.
Our cable-fault detector is a testing device of good integrity. It
can test on the High Resistance Flashover Fault, Grounding
High and Low Resistance Fault, Short & Off Circuit on the
Cable Fault and Poor contact and etc. If being equipped with
sounding method and locating instrument, it can exactly detect
the fault point. Furthermore, it especially applies to test for
various power cable and communication cable.
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Ⅱ. Product features and technique parameters
1. Functions
1.1 Multiple functions
Safe, quick and accurate test. The instrument applies the methods
of Low Voltage Pulse and HV Flashover. It can test all kinds of
faults, especially on the Flashover and High Resistance fault
testing and without burning through. If it is equipped with locating
instrument, it can exactly point out the location of the fault.
1.2 High Precision
Our instrument uses the tech of high speed data sampling, the
speed of A/D is 100MHz, and makes resolution ratio of 1m and
testing dead zone of 1m.
1.3 High intelligent
The testing results automatically show by wave form and data on
the large LED. It is easy for viewing. It does not need especial
training for operators.
1.4 Function of Wave Form and Parameter Saving & Reading
It uses non-volatile devices and after turning off, it still saves the
wave form and data.
1.5 Function of Double-trace Showing
It can compare the wave forms of fault-manner cables and those of
the regular ones. It is benefit for the further testing of the fault.
1.6 Function of Magnifying on the Scale of Wave Form
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Through magnifying the scale of the wave form, it can make further
exact testing.
1.7 It can wantonly change the position of the cursor, showing the
direct or indirect distance of fault point and testing point.
1.8 It has the function of changing the speed of communication
depending on the tested cable.
1.9The instrument is portable and with a chargeable battery to
provide power. It is convenient to take and use.
2 Main technique parameters
2.1 Scope of application and using purpose
The instrument can test all kinds of electric cable(voltage of
1KV-35KV) and the Short Circuit, Grounding, Leakage of High
Resistance. High Resistance Flashover, Out Line and Bad Contact
fault on the local cables, frequency modulation communication
cables, coaxial cable and metal aerial cables. It also can test the
length of cable and the spread velocity on the cable.
2.2The longest testing distance is 15KM (100KM for the open-wire
line)
2.3 Testing .dead zone is 1M.
2.4 Resolution of reading is 1M
2.5 Power dissipation is 5VA
2.6 Service condition :
environment temperature 0℃~＋40℃
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terminal temperature －10℃~＋50℃
relative humility 20-90%RH
2.7 Dimension: 275×220×160mm3
2.8 Weigh: 1.8kg
Ⅲ. Low Voltage Impulse Testing Method
1. Principle of Testing
The principle of cable fault testing is based on the asymmetrical
resistance’s reverse on the communication of the electric wave in
the cable.
Based on the theory of Transportation Line, every line has a unique
resistance Zc, which is depending on the structure of the circuit but
not the length of the line. In the symmetrical transportation line, the
resistance input equals the unique resistance at any point. If the
load of terminal equals the unique resistance, the current wave and
voltage wave on the transportation reverse none but absorbed
totally by the terminal. When the resistance at any point is unequal
to Zc, the electric wave reverse all or partly. The scale of reverse
polarity can be expressed by parameter P, the relation is on the
below:
Zcis the resistance of the transportation line
Zois the resistance of the reverse transportation line
P＝
Ur（reflection wave）
Ui（incident wave）
＝
Zo－Zc
Zo＋Zc
（1）
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(1) When it works without fault, Zo＝Zc, P＝0, no reverse.
(2) when the circuit is off line, Zo＝∞, P＝1, it reverse totally and the
polarity of the incoming wave and its reflex are the same.
(3) when the circuit is short circuit, Zo＝1, P＝－1, it minus totally
reverse and the polarity of the incoming wave and its reflex are the
opposite .
When there is an impulse electric wave, the impulse conveys on
the line by the speed of V, and reflex to the input terminal when the
row distance Lxmeets the fault point. The time of the reverse is T,
so the relation is on the below:
V is the speed of the electric wave of the line, and is related to the
linear circuit parameter and constant to an case which can be
detected by the instrument and calculated by computer. When the
displayer show the the impulse and the reverse wave from the fault
point in real time, we can get the time T by providing the
instrument’s time signal. So we can get the location of the fault
point from (2). Different kinds of faults has wave charts as below:
Method of impulse can easily detect the fault in the off line, short
circuit and cable’s low voltage grounding. In the situation of high
resistance fault, for it still shows high resistance in the condition of
low voltage impulse and makes no or few reverse wave. In this
2Lx
＝
VT
（2）
∴Lx
＝
1
2
VT
T
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