Cable Outer Sheath Fault Locator | XHHD523L
With the rapid development of urban power networks, many power bureaus, construction companies and design institutes are encountering 110kV XLPE cables for the first time. Due to limited experience, many cable outer sheaths fail the withstand voltage test (10kV/1min) after installation. The XHHD523L cable outer sheath fault locator is developed to solve exactly this problem, combining pin-pointing and withstand voltage testing in one instrument.
The external protective layer of modern power cables mostly uses HDPE sheath material, which passes the DC 25kV/5min withstand voltage test before leaving the factory with a leakage current of less than dozens of microamperes. Defects after laying are mostly caused by external damage during backfilling and covering, termite bites, water ingress in ground boxes, deterioration of original defects, and moisture penetration of grounding wires or parts with decreased insulation resistance. When the cable is buried too deep or the surrounding situation is complex, locating these defects becomes very difficult, and some defects remain unsolved for years, running with hidden danger. The XHHD523L provides a fast and accurate solution for these difficult sheath fault cases.
Applications & Target Audience: Engineered for power supply bureaus and electric power company cable inspection and repair departments, power construction and installation contractors, electric power design institutes, owners of 110kV and above cable projects, and cable engineering supervision and acceptance organizations that need to pass sheath withstand voltage acceptance tests and locate outer sheath defects quickly and accurately.
Key Specifications
| Parameter |
Specification |
| Power Supply |
220V (1 ±10%), 50Hz (1 ±5%) |
| Output Voltage |
0 ~ 10 kV (square wave) |
| Output Current |
200 mA |
| Output Capacity |
2 kVA |
| Frequency Adjustment |
Min 0.4Hz, Max 1Hz (adjustable) |
| Positioning Accuracy |
±0.01% ~ 0.03% |
| Display |
Digital display |
| Material |
Aluminum alloy |
| Operating Temperature |
-20 °C ~ +60 °C |
| Pin-pointing Methods |
Step voltage method (buried cables), clamp current method (trench and tunnel cables) |
| Test Functions |
Outer sheath fault location and withstand voltage test, one-button switching |
Advanced Features
Output voltage adjustable from 0 to 10kV for different sheath fault conditions
Output frequency adjustable from 0.4Hz to 1Hz for optimized signal transmission
Overcurrent protection for safe operation
Pin-pointing and withstand voltage test switched by one button, with no blind area
Receiver sensitivity adjustable for different site noise conditions
Zero-position protection prevents accidental high-voltage output
Test range without blind area, covering both buried and trench-laid cables
Dual pin-pointing methods: step voltage method and clamp current method
This instrument provides cable engineers with a reliable, comprehensive solution for cable outer sheath defect location, helping power utilities, contractors and design institutes pass sheath acceptance tests and eliminate hidden dangers in 110kV XLPE cable networks.
Two Methods for Every Laying Condition
The XHHD523L covers both common cable laying conditions with two field-proven pin-pointing methods, so the operator always has the right tool for the job.
| Comparison |
Step Voltage Method |
Clamp Current Method |
| Best For |
Directly buried cables |
Cables laid in trenches or tunnels |
| Receiver Connection |
Two ground pins connected to the receiver |
Current clamp connected to the receiver |
| Detection Principle |
Step voltage distribution around the fault point |
Current direction change at the fault point |
| Fault Point Indication |
Pointer swing direction reverses at the fault point |
Pointer swings left before and right after the fault point |
| Precision Refinement |
Reduce ground pin spacing for accurate judgment |
Move the clamp along the cable to narrow the range |
Step Voltage Method Operation
The step voltage method is used for directly buried cables. The transmitter applies a square-wave voltage to the faulty sheath, and the operator walks along the cable route with the receiver and two ground pins to pinpoint the fault.
Roughly locate the fault distance first, then hold the receiver and ground pins to determine the precise point
Connect the receiver to the two grounds using the step voltage method; usually start with gear "I" (low power), with gear "II" (high power) available for weak signals
Return the microammeter pointer to zero by adjusting the zero knob
Adjust the amplitude knob to set the signal gain; rotate right for larger swing amplitude
Place two ground pins parallel to the cable direction, one in front and one behind, and keep the same line color in front throughout the detection
Observe the pointer: before the fault point it swings left first and then sharply right; after passing the fault point it swings right first and then sharply left, and the direction change indicates the fault position
Continuously reduce the distance between the two ground pins to shorten the judgment distance for accurate pin-pointing
Clamp Current Method Operation
For cables laid in trenches or tunnels, the clamp current method is used. The transmitter operation is the same as for the step voltage method, but the receiver is connected to a current clamp instead of ground pins.
Clamp the current clamp onto the cable under test, with the red arrow pointing to the end of the cable
Adjust the gear to "I", set the pointer to zero, and adjust the signal gain
Move the clamp along the cable: before the fault point the pointer swings sharply to the left, and after the fault point it swings to the right
Based on the swing direction change, determine the precise fault point
Wiring Notes
Correct wiring is essential for accurate and safe testing. The red high-voltage output wire clip is connected to the faulty phase or the cable armor, and the black clip is connected to ground. The wiring at the device end is the same, with the red wire connected to the high-voltage output terminal and the black wire grounded.
Typical Sheath Defects
External damage to the outer sheath during backfilling and covering after cable laying
Termite bites and rodent damage on the protective sheath
Water ingress in ground boxes causing sheath and accessory deterioration
Deterioration of original manufacturing or installation defects over time
Moisture penetration of grounding wires or parts with decreased insulation resistance
Sheath damage in deeply buried cables with complex surrounding conditions
Panel Description
Power switch: turns the instrument on and off
Location / withstand voltage test button: press once for the green light, activating the outer sheath fault locating function; press again for the red light, activating the withstand voltage test function
Overcurrent protection button: press to enable overcurrent protection with the blue light on; must be off for locating function and on for withstand voltage testing
Start button: the light is green when the voltage regulating knob is at zero position; press to start boosting and the light goes out
Stop button: stops the high-voltage output
Voltage regulator: adjusts the output voltage from 0 to 10kV
Frequency adjustment knob: adjusts the output frequency during fixed-point operation of the outer sheath; turn right for higher frequency and left for lower frequency
Voltmeter and ammeter: display the output voltage and current in real time
FAQ
Q1: What is the XHHD523L cable sheath fault locator used for?
It is used to locate outer sheath defects of high-voltage power cables, especially 110kV XLPE cables, and to perform sheath withstand voltage tests. It solves sheath faults caused by laying damage, termite bites, ground box water ingress and moisture penetration that are difficult to locate with conventional methods.
Q2: What is the step voltage method?
It is a pin-pointing method for directly buried cables. Two ground pins are placed parallel to the cable direction and connected to the receiver. When the pins are on different sides of the fault point, the pointer swing direction reverses, allowing the operator to pinpoint the fault precisely by reducing the pin spacing.
Q3: Can it locate faults on cables laid in trenches or tunnels?
Yes. For trench or tunnel cables, the clamp current method is used. The current clamp is clamped onto the cable with the red arrow pointing to the cable end; the pointer swings sharply left before the fault point and right after it, identifying the fault position.
Q4: What are the output capabilities of the instrument?
It provides 0 ~ 10kV square-wave output with 200mA current and 2kVA capacity. The output frequency is adjustable from 0.4Hz to 1Hz, the voltage is adjustable, and the positioning accuracy reaches ±0.01% ~ 0.03%.
Q5: Who is this sheath fault locator designed for?
It is designed for power supply bureaus and electric power company cable inspection and repair departments, power construction and installation contractors, electric power design institutes, owners of 110kV and above cable projects, and cable engineering supervision and acceptance organizations.
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