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HVTest HT-TC Manual

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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.
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.
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: qiao@hvtest.cc
 Website: www.hvtest.cc
Our aim is to improve and perfect the
The input/output terminals and the test column
1

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Summary of Contents for HVTest HT-TC

  • Page 1 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.
  • Page 2  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.
  • Page 3 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.
  • Page 4 －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.

  • Page 5: Table Of Contents

    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.

  • Page 6: Ⅰ. Product Introduction

    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.

  • Page 7: Ⅱ. Product Features And Technique Parameters

    Ⅱ. Product features and technique parameters 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.
  • Page 8 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.

  • Page 9: Ⅲ. Low Voltage Impulse Testing Method

    terminal temperature －10℃~＋50℃ relative humility 20-90%RH 2.7 Dimension: 275×220×160mm 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.
  • Page 10 (1) When it works without fault, Z , P＝0, no reverse. ＝Z (2) when the circuit is off line, Z ＝∞, 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 .

  • Page 11: High Voltage Dc Flashover Method

    situation, we need add amount of current or high voltage impulse to discharge it and get the reverse wave by the short circuit in a wink by flashover electric arch. P=1 off line P=-1 short circuit P=0 regular IV. High Voltage DC Flashover Method When the resistance of fault is really high, before it forms a constant current tunnnel, it can grandually rise the voltage on the cable.

  • Page 12: High Voltage Impulse Flashover Method

    Ideal wave Real wave Theoritically the wave form should be steep square wave, but refer Figure 3 to the incomplete reverse and circuit comsuption the real wave becomes smaller and smoother. V. High Voltage Impulse Flashover Method When fault point reduces the resistance and forms constant resistance tunnal, we have to choose the voltage impulse method for we can not add more high voltage current by the limit of instrument capacity.

  • Page 13: Fundamantal Principle And Composition

    V·T ＝ Fault distance: T+ΔT≥T , ΔT is time of discharge decay. Test line full wave device expanded wave T+ΔT VI. Fundamantal Principle and Composition 1. Fundamantal Principle of Instrument Based on the fault testing principle, when the device is in the trig mode of flashover, the flashover wave formed by electric arch on the fault point is random einmal transient wave, so the instrument should have the function of saving, capture and displaying the...
  • Page 14 detective impulse to the tested cable and input circuit in certain cycle. At the same time the A/D works and has the same process of sampling, storing, processing and displaying as stated before. LED displayer should have reverse wave form. 2.

  • Page 15: Panel Controlling And Keymanual's Function

    the micro processor. Keyboard it the window for communication between human and computer. Opertators can type the command by keyboard to computer by the testing and then the computer controller complete some kind of testing. VII. Panel Controlling and Keymanual’s Function 1.

  • Page 16: Instrument Use Fault Test Method

    200m / μs. The corresponding value should be entered according to the actual type of cable. Otherwise, the result will be incorrect. 6. Transmit: Each time pressed, the instrument emits a pulse and samples. 7. Display scale: Different measurement range corresponds to a different display scale, that is, the sampling point, according to different intervals displayed on the screen, the larger of range, the larger interval, the greater the proportion of display, change the...
  • Page 17 be calibrated to ensure the accuracy of fault measurement. The calibration method is as follows: 1) Prepare a standard cable same type as the cable under test; 2) Connect the standard cable to the output port of the tester; 3) Turn on the instrument power switch; 4) Choose the impulse mode, the upper right corner of the screen shows "impulse";...
  • Page 18 E. Enter the wave speed value corresponding to the cable under test. F. Adjust the “waveform control” to maximum, press “transmit”, there is wave on the screen. G. If there is no reflected wave, adjust the measurement range and then repeat the pulse, so try several times, until wave reflects. H.
  • Page 19 2) HV DC Flashover Method A. First working mode at flash over, the transmission speed should be the wave speed of the cable under test. B. Application: the resistance of the fault is very high and not forming a fixed tunnel, under a certain voltage it can create a flashover discharging fault of the electric cable.
  • Page 20 T1 voltage adaptor………………………………………………2KVA T2 high voltage transformer………………….……0～50KV，2KVA high voltage silicon stack……………ReV: 100KV， FoV: 100mA high voltage capacity……………………………...0.1μF，10KV The AC/DC meter: 0-300V; The current meter: 100mA; In the high pressed testing equipment, Resistance: 30±20/5kΩ; Output resistance: 500Ω±10%. E. Turn on the power, the screen lights. Then rise the voltage gradually by adaptor, and when the fault point has the phenomenon of flashover, the current in the micro-amp meter rises heavily and the indicator in voltage meter also alters...
  • Page 21 Impulse High Voltage Flashover Method A. Application: the fault point with a high resistance but already forms a fixed a tunnel in cable. The high voltage equipment’s capacity is in limit, if the current can not reach the certain level, it should apply flashover method.

  • Page 22: Announcement

    discharege normally. The impulse flashover fault point whether discharge normally can be detected by the whole wave form. E.It can detect whether there is a fault of spark-over flashover phenomenon by the sound of the gap sphere dischargin and indicator of the electric meter. If the discharging phenomenon does not clear, it can add the voltage, sphere gap, or the capacity of storage capacitor.
  • Page 23 3. In the method of current flashover or impulse, operators should pay great attention on the safety. Arrange the lines as ordered. 4. After the flashover testing, it should cut off the power, remove the connecting line between the device and high voltage testing equipment.

  • Page 24: Packing List

    should be regularly charged, so as not to damage the battery. X. Packing list 1. Host 2. Power cord 3. Output cable 4. Instruction manual 5. Inspection report 6. Certificate XI.Common fault repair Fault phenomenon Reason Solution 1. See if there is an image 1.indicator broken；...

  • Page 25: Appendix

    Appendix Chart of common velocity on the cable(Ref) unit：m/μs name model Test cable velocity HEQ－2527×4×1.2 Hi-Fre cable Gap of cables 232m/μs ＋6×0.9 other 240～244m/μs HEQ－2521×4×1.2 Gap of cables 248/μs HDYFLE22－156 Gap of cables 224m/μs other 230m/μs Lo-Fre cable HEQ212×4×12 Gap of cables 240m/μs other 248m/μs...

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