HZ-501A Underground Electrical Power Cable Fault Locator

Huazheng Electric Manufacturing (Baoding) Co., Ltd. is one of the leading manufacturers and suppliers of hz-501a underground electrical power cable fault locator in China. Please feel free to buy high quality equipment for sale here from our factory. Good service and reasonable price are available.

HZ-501A Underground Power Cable Fault Locator Price

Cable Fault Classification

Cable faults are primarily categorized based on their resistance characteristics and can be classified as low-resistance faults or high-resistance faults. High-resistance faults are further divided into leakage faults and flashover faults.

Low-Resistance Faults

A low-resistance fault occurs when the insulation of a cable is damaged, creating a conductive path between phase conductors or between a phase and ground. Such faults can be directly detected using the low-voltage pulse reflection method. These faults are generally characterized by a resistance value of less than a few hundred ohms. When the fault resistance drops to zero, it is specifically referred to as a short-circuit fault, which is a special case of low-resistance faults.

High-Resistance Leakage Faults

A high-resistance leakage fault occurs when the cable insulation medium is damaged and forms a fixed resistive channel, but the fault resistance is too high to be detected by the low-voltage pulse reflection method. Typically, the resistance value in such cases is several hundred ohms or higher. During on-site DC leakage voltage testing, the leakage current increases continuously as the applied DC voltage rises, eventually exceeding the standard allowable value for the cable. It is important to note that high-resistance leakage faults and low-resistance faults are described relative to each other, and there is no definitive boundary separating the two categories.

High-Resistance Flashover Faults

A high-resistance flashover fault occurs when the cable insulation is damaged but has not yet formed a fixed resistive channel. Within the pre-test voltage range, when the applied voltage reaches a certain threshold, the leakage current suddenly increases dramatically, far exceeding the cable's standard allowable value. This type of fault is characterized by its intermittent nature-the insulation breaks down under high voltage but may recover at lower voltages, making it distinct from leakage faults where a continuous conductive path exists.

Discrimination method of fault characteristics of power cable

Method 1: MΩ meter and multimeter

Method 2: Cable pre-testing results

Method 3: HZ-501A power cable pre-locator

Key Applications

Low-resistance and open-circuit faults can be directly judged using:

Ohm meter

HZ-501A Impulse Testing Waveform Analysis – Power Cable Fault Testing Program

Power cable fault testing using the HZ-501A flashover instrument generally follows the procedures outlined below:

(1) Fault Analysis & Preparation – Analyze the cable fault characteristics, and determine the cable's rated voltage and insulation material type.

(2) Length Measurement & Speed Calibration – Using the HZ-501A's impulse method, measure the cable length and calibrate the radio wave propagation speed in the faulty cable.

(3) Fault Pre-Location – Select the appropriate testing method and use the HZ-501A flashover instrument to perform pre-location of the cable fault.

(4) Precise Fault Location – Pinpoint the exact fault position, including underground cable route tracing, depth measurement, and precise fault point locating.

(5) Tolerances Analysis – Apply tolerance analysis to the cable fault testing results, considering measurement tolerances, propagation speed tolerances, judgment tolerances, and instrument tolerances.

The Main Specification Index of System

1) Single-chip microprocessor platform with touch-screen operation

2) System functions: Fault distance measurement,Fault locating,transmission speed test,fault resistance,Power cable route tracing,buried depth detection etc

3) Detecting method: Low voltage impulse,Flash over method,Audio frequency method,Acoustic magnetic synchronous method,Valley value method,Peak method,Electromagnetic induction etc.

4) Display control: Flashover instrument: 8 inches industrial grade LCD, Battery inside, can work for 6 hours continually; others are Pointer table display

5) Detection range: testing distance: 30km, detection depth: 2-5m

6) Measurement accuracy: Pre-testing tolerances: ±10m (absolute value) or 1% (relative value), Precisely detecting tolerances: ±0.2m (Locating,route,depth)

7) Sampling frequencies: 80MHz,40MHz,20MHz,10MHz

8) Sampling method: automatic continuous sampling, no any discharging wave form can be left out absolutely.

9) Low voltage impulse: 0.05/0.1/0.2/0.5/1/2/8uS, seven

10) Output power: Route power: 100W,Impact power: 0～400W

11) Impact high voltage: 0～35kV

12) Short circuit current: 0～320mA

13) Burn through power: 0～1225J

Common problem and Solution

1. No response after start:

Check the AC 220V power supply;

Check whether the fuse is good

2. The voltage boot is not normal

Check the ground wire, high voltage ground wire is good and whether the adjust voltage knob is loosened;

3. High voltage can't be started.

Check if "Adjust Voltage" knob at zero;

4. Stop button is no response

Press the stop button for 2 to 7 seconds, or when pressing the stop button, to pull the start lever.

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