1、 Product Introduction

The cable fault tester is a new generation portable cable fault tester designed and manufactured by our company according to user requirements, considering on-site use. It adheres to our consistent principles of high technology, high precision, and high quality, and elevates the level of cable testing to a new level.

 

The entire cable fault tester consists of three main parts: flash testing, tracking, and positioning.

 

The cable fault tester (flash tester) can be used to detect low resistance, high resistance, short circuit, open circuit, leakage faults, and flashover faults of various cables. It can accurately detect the location of the fault point, cable length, and cable burial path of underground cables. It has the characteristics of accurate testing, high level of intelligence, wide adaptability, stable performance, and lightweight portability. The instrument adopts a Chinese character system, high-definition display, and user-friendly interface.

 

The cable fault tester (track gauge, fixed-point gauge) adopts a special structure of acoustic vibration sensor and low-noise dedicated device as preamplifier, greatly improving the sensitivity of instrument fixed-point and path detection. In signal processing technology, the distance between the fault point and the sensing probe is displayed digitally, greatly eliminating the blindness during fixed-point operation. For the overhead faulty cables in the cable trench, the vibration sound of the entire cable makes any fixed-point instrument helpless and unable to determine the specific location of the closed fault. Nowadays, as long as the sensor probe of this instrument is in contact with the faulty cable or nearby cable, the distance and direction of the fault can be accurately displayed, and the fault location can be easily and quickly determined. In addition, the application of power frequency adaptive cancellation theory and high-Q power frequency notch technology greatly enhances the suppression and anti-interference ability of 50Hz power frequency signals in strong power frequency electric field environments, and reduces fixed-point blind spots. In terms of instrument functionality, the use of acoustic electric synchronous reception and display technology effectively overcomes the difficulty of fixed-point positioning caused by environmental noise interference in the fixed-point site. Especially the digital display of fault distance eliminates the need for operators to analyze and judge complex waveforms, and to a considerable extent replaces the rough distance measurement function of the flash tester. For hundreds of meters long faulty cables, it is generally not necessary to conduct rough measurements to implement fixed points, which truly achieves high efficiency, speed, and accuracy. The use of 16kHz amplitude modulated electromagnetic waves and amplitude detection technology for path detection and cable burial depth measurement avoids the interference of television line frequency on the fixed-point instrument when the original equal amplitude 16kHz signal source is used.

 

2、 Execution standards

Serial number

 

Standard name

 

one

 

DL/T849.1-2004 General Technical Conditions for Special Testing Instruments for Power Equipment/Flash Tester

 

two

 

DL/T849.2-2004 General technical specifications for specialized testing instruments for power equipment/fixed-point instrument

 

three

 

DL/T849.3-2004 General Technical Conditions for Special Test Instruments for Power Equipment/Pathfinder

 

3、 Instrument features

1. Cable fault tester (flash tester)

 

(1) Widely applicable: Used for measuring high and low resistance, short circuit, open circuit, broken wire, high resistance leakage, and high resistance flashover faults of various power cables, high-frequency coaxial cables, local telephone cables, and buried wires with two or more evenly laid cables of different cross-sections and media. It can also be used to measure cable length and measure the propagation speed of radio waves in cables.

 

(2) Convenient to carry: The host is powered by lithium batteries, lightweight, easy to carry, and convenient for field testing and mine cable testing.

 

(3) User friendly interface: Adopting a large screen 320 × 240 dot matrix Chinese character graphic interface, high brightness graphics are clear and beautiful, easy to operate, and strong anti-interference ability.

 

(4) Safe and reliable: Adopting a new type of current sampler, a novel sampling method with simple wiring, intuitive waveform analysis, complete isolation from high voltage, and absolute safety for the host and operators.

 

(5) High quality: All key components are imported to ensure the accuracy of test results.

 

(6) Exquisite appearance: Made of sturdy and wear-resistant materials, the instrument has a longer overall texture and service life.

 

2. Pathfinder and fixed-point instrument

 

(1) High receiving sensitivity: using special manufacturing technology, the transmission distance is increased, and the instrument can still receive signals clearly.

 

(2) Low static drift: The core components are imported and have reliable performance.

 

(3) High positioning accuracy: quartz crystal oscillator and high-speed signal processing chip are used for signal sampling and processing, ensuring accurate and reliable positioning accuracy.

 

(4) Strong anti-interference ability: Under severe interference conditions, the instrument can still ensure good performance and stable operation.

 

(5) Convenient to carry: Equipped with a rechargeable battery for power supply, suitable for various occasions.

 

4、 Technical parameters

1. Cable fault tester (flash tester)

 

(1) Environmental temperature: -10 ℃ to 40 ℃

 

(2) Measurement error: Rough measurement error ± 1%

 

(3) Test distance: maximum not less than 16km

 

(4) Shortest testing distance (blind spot): 1-3m

 

(5) Sampling rate: 25MHz

 

(6) Power supply and power consumption: AC or internal DC power supply

 

AC 220V ± 10%, power consumption not exceeding 10W

 

DC 6V/7AH, power consumption not exceeding 6W

 

(7) Internal transmission pulse width and amplitude: 0.2 µ s 100-120V

 

2µs    150～160V

 

(8) Working mode: Low voltage pulse, DC high voltage flash testing, and impulse high voltage flash testing methods

 

(9) Display resolution: V/50 meters, V is the propagation speed m/µ s

 

(10) Display mode: 320 × 240 LCD with backlight display

 

(11) Quality: 6kg

 

(12) Volume: 500 × 300 × 195mm3

 

2. Pathfinder and fixed-point instrument

 

(1) Tracking working mode: output - fixed frequency intermittent square wave signal

 

(2) Output power: Pomax ≥ 100W

 

(3) Output impedance: 1 Ω∞

 

(4) Signal frequency: 16kHz

 

(5) Signal amplitude: 15V-340V

 

(6) Pathfinder transmitter power supply: AC220V ± 10 ℅

 

(7) The rough measurement error is less than 10%, and the fixed-point error is less than ± 10cm.

 

(8) Electromagnetic channel gain>110dB (300000 times).

 

(9) The sensitivity of the electromagnetic channel receiver is less than 5 μ V.

 

(10) Burial depth detection:<3m