Home > Products >

Cable Sheath Fault Locator XHHG521A 7500V High Voltage Bridge Method for Breakdown Point Detection

Name: Cable Sheath Fault Locator XHHG521A 7500V High Voltage Bridge Method for Breakdown Point Detection
Brand: Xi'an Xu&Hui Electromechanical Technology Co., Ltd.
SKU: XHHG521A
Price: 2,500.00 USD
Availability: InStock

Product Details:

Place of Origin:	China
Brand Name:	XZH TEST
Certification:	CE ISO
Model Number:	XHHG521A

Detail Information

Place of Origin:

China

Brand Name:

XZH TEST

Certification:

CE ISO

Model Number:

XHHG521A

Product Name:

Cable Sheath Fault Pre-locator

No-load Voltage:

≥7500V

Short Circuit Current:

≥40mA

Working Power Supply:

AC 220V±10% 50Hz±1Hz

Highlight:

High Light

Highlight:

7500V High Voltage Bridge Detection

Precise Cable Breakdown Point Locator

MURRAY Bridge Flashover Fault Testing

Trading Information

Minimum Order Quantity:

1 unit

Price:

Negotiable

Packaging Details:

Wooden packaging

Delivery Time:

5-8 work days

Payment Terms:

T/T

Supply Ability:

2000 units per year

Product Description

Product Overview

The XHHG521A Cable Sheath Fault Locator is a precision diagnostic instrument designed based on the MURRAY bridge principle, specifically engineered to locate breakdown points in various power cables and identify defect points with low insulation resistance values that have not yet fully broken down.

The system integrates an electric voltage regulator with an R-type transformer to form a high-voltage constant current source, featuring push-button voltage control. With a no-load voltage of 7500V and short-circuit current of 100mA, it employs a high-sensitivity amplifier and galvanometer for balance indication. The balanced bridge is formed with a proportional potentiometer, entirely positioned at high potential. Measurement is performed via a specially designed two-core high-voltage rubber cable using the four-terminal resistance method to eliminate lead resistance errors. The entire panel operates at low potential for operator safety. One-touch operation allows cable length input with automatic fault distance calculation. The high-voltage source and bridge are integrated within a portable protective case, delivering high voltage capability with light weight, intuitive operation, and enhanced safety.

Key Specifications

Model Number

XHHG521A

Brand Name

XZH TEST

No-Load Voltage

≥7500V

Short Circuit Current

≥100mA (5~40mA recommended for balancing)

Positioning Accuracy

±(0.2%·L±1) m

Power Supply

AC 220V (±10%), 50Hz; Built-in 8.4V battery

Test Mode

Saved Test

Test Region

Forming Cable

Weight

25 kg

Certification

CE, ISO

Origin

China, Xi'an

Packaging

Wooden Case

Product Features

Output voltage is fully adjustable to accommodate various cable testing scenarios
Delivers high accuracy and measurement stability with advanced bridge balancing circuitry
Employs a high-sensitivity amplifier and galvanometer for precise balance indication
Integrated zero protection ensures operator and equipment safety during high-voltage operation
Automatic fault point detection with retained manual testing capability for specialized applications
Bridge balance method eliminates blind zones compared to wave reflection techniques, making it ideal for short cables and near-end breakdown point determination

Technical Parameters

Parameter	Specification
No-Load Voltage	≥7500V
Short Circuit Current	≥100mA (5~40mA recommended for balancing)
Positioning Accuracy	±(0.2%·L±1) m
Weight	25 kg
Power Supply	AC 220V (±10%), 50Hz±1Hz; Built-in 8.4V battery

Primary Applications: The XHHG521A high-voltage bridge method is particularly effective for: (1) locating high-resistance breakdown points in laid cables, especially linear high-resistance faults at cable intermediate joints that resist burning into low resistance; (2) detecting flashover-type breakdown points where the constant current source sustains the arc for stable bridge current flow; (3) identifying defects that have not yet fully broken down but exhibit low insulation resistance values detected by megohmmeter testing.

Application Scenarios

Frequently Asked Questions

Q1: What types of cable faults can the XHHG521A detect?

The XHHG521A is designed to detect high-resistance breakdown points, flashover-type breakdowns, and insulation defects with low resistance values in various power cables. It is particularly effective for linear high-resistance faults at cable intermediate joints that are difficult to burn into low resistance, as well as defects identified by megohmmeter testing that have not yet fully broken down under operating voltage.

Q2: How does the MURRAY bridge method work for cable fault location?

The MURRAY bridge method forms a balanced bridge circuit with a proportional potentiometer positioned at high potential. A known reference cable and the faulty cable are connected as bridge arms. The system applies high-voltage constant current and measures the balance point through a high-sensitivity galvanometer. The fault distance is calculated from the bridge ratio and the total cable length, with automatic computation via one-touch operation.

Q3: What is the positioning accuracy of this cable sheath fault locator?

The XHHG521A achieves positioning accuracy of ±(0.2%·L±1) meters, where L represents the total cable length. This means for a 1000-meter cable, the fault location accuracy is approximately ±3 meters, providing sufficient precision for efficient excavation and repair operations.

Q4: Can the XHHG521A test high-resistance faults effectively?

Yes. The XHHG521A is specifically designed for high-resistance faults. Its 7500V no-load voltage and 100mA short-circuit current capability allow it to maintain a stable current through high-resistance fault points. For flashover-type breakdowns, the constant current source sustains the arc, ensuring sufficient bridge sensitivity for accurate fault location even under challenging conditions.

Q5: Is the XHHG521A suitable for field use and underground cable testing?

Absolutely. The high-voltage source and bridge are integrated within a portable protective case weighing 25 kg, making it suitable for field deployment. It operates on standard AC 220V power with a built-in 8.4V backup battery. The device is ideal for testing cables after laying, including underground power cables, and supports both automatic and manual testing modes for flexible field operation.

Q6: What are the advantages of the bridge method over wave reflection methods?

The bridge balance method offers a critical advantage: it has no blind zone. Unlike wave reflection methods that struggle with short cables and faults near cable ends, the bridge method maintains full accuracy regardless of fault distance. This makes it the preferred solution for locating breakdown points in short cable segments and faults occurring close to cable terminals.

Q7: What is the minimum order quantity and delivery time?

The minimum order quantity is 1 unit. Standard delivery time is 5-8 working days. Each unit is packaged in a sturdy wooden case for safe international shipping. Annual production capacity is 2,000 units, with payment via T/T.

About XZH TEST

XZH TEST is a professional manufacturer specializing in cable fault detection and diagnostic solutions for power utilities, electrical contractors, and industrial customers worldwide. With advanced technologies including MURRAY bridge analysis, TDR, high-voltage pulse testing, and intelligent fault location systems, XZH TEST delivers reliable equipment that helps engineers locate cable faults faster and improve power network reliability.

Tags:

Cable Sheath Fault Locator XHHG521A 7500V High Voltage Bridge Method for Breakdown Point Detection

High Light

Highlight:

7500V High Voltage Bridge Detection

Precise Cable Breakdown Point Locator

MURRAY Bridge Flashover Fault Testing

Cable Sheath Fault Point Locator,

XHHD523L Cable Sheath Locator,

Precise Positioning Cable Sheath Locator

Cable Sheath Fault Locator XHHD523L 10kV Square Wave Output for Fast Accurate HV Cable Fault Detection

7500V HV Bridge Method Power Cable Outer Sheath Fault Tester for Precise Insulation Breakdown Location| XHHG521A

10kV Cable Sheath Fault Locator for High Voltage Testing|XHHD523L