Cable Outer Sheath Fault Location System Murray Bridge Principle

• Customization: Available
• After-sales Service: Support
• Warranty: 1 Year
• Model NO.: XHHG520
• Connectors: Coaxial BNC
• Test Mode: Point Test
• Usage: Digital Cable Tester
• Test Region: Unformed
• Cable Type: Shielded
• Power: Electricity
• Certification: CE
• Customized: Customized
• Color: Black
• Transport Package: Wooden Case
• Specification: 62*39*75
• Trademark: XZH TEST
• Origin: Shaanxi
• Package Size: 62.00cm * 39.00cm * 75.00cm
• Package Gross Weight: 53.000kg

Product Description

Product Description

XHHG520 Integrated cable outer sheath fault tester i designed based on the MURRAY bridge principle. It can be used to locate the breakdown points of various wires and cables and the defect points with low insulation resistance but no breakdown.

The equipment uses an electric voltage regulator and an R-type transformer to form a high-voltage constant current source, and the voltage can be increased or decreased by key operation. The no-load voltage is 15kV, the short-circuit current is 100mA, and a high-sensitivity amplifier and a galvanometer are used to indicate the balance. A balanced bridge is formed with a proportional potentiometer, and the whole is placed at a high potential. The measuring cable is a specially designed double-core high-voltage rubber cable, and the four-terminal resistance measurement method is used to avoid the error introduced by the lead resistance.

It can quickly and accurately find hidden dangers such as grounding faults and excessive leakage current of the outer sheath of 10kV-500kV single-core and three-core high-voltage and extra-high-voltage cables.

At the same time, it can perform 5kV-15kV, 1-minute DC withstand voltage test on the outer sheath of high-density polyethylene and polyvinyl chloride cables. It is an essential special instrument for cable equipment maintenance of 10kv-500kV single-core and three-core high-voltage and extra-high-voltage cable operating units, extra-high-voltage cable engineering companies, and various power transmission and transformation engineering companies.

Features

Bridge part:
Output voltage is adjustable;
With high accuracy and stability;
Adopt high-sensitivity amplifier and galvanometer to indicate balance;
Zero protection;
Automatically test the fault point, but retain the manual test function;
Compared with the wave reflection method, the bridge balance method has no blind spot, which is used to judge the breakdown point of short cables and those close to the end.

Withstand voltage and positioning part:
With automatic protection functions for overcurrent, overvoltage and overheating;
With zero-position start protection, it is safer and more reliable;
Unique self-discharge design, as long as the high-voltage output is cut off, the high voltage itself is zero;
With current and voltage dual pointer meter display, intuitive and clear;
Positioning mode and withstand voltage mode can be switched with one button, which is convenient and fast;
There is no blind spot in the test range;
The receiver sensitivity is adjustable, which is more convenient for positioning;
Overcurrent protection switch function, withstand voltage mode and positioning mode are easy to use.

 The integrated cable outer sheath fault location system is particularly suitable for
1. High-resistance breakdown points of cables after laying, especially linear high-resistance breakdown points that are difficult to burn into low resistance, such as linear high-resistance breakdown of cable intermediate joints.
2. Flashover type breakdown points, after breakdown, the constant current source can maintain the arc, a stable current passes through the bridge, and the bridge has sufficient sensitivity.
3. Defect points that have not yet broken down but have low resistance, such as using a megohmmeter to find that the cable resistance is low, but the insulation defect point does not break down under the operating voltage.

Product Parameters

Bridge part:
1. No-load voltage ≥15kV;
2. Short-circuit current ≥100mA (when adjusting balance, it is recommended to set it at 5~40mA);
3. Positioning ratio accuracy ±(0.2%·L±1) meter;
4. Weight: 35kg;
5. Working power supply: AC 220V (±10%), 50Hz±1Hz; 8.4V built-in battery.
Voltage resistance and positioning part:
1 Input voltage: 220V (±10%), 50Hz (±2Hz);
2 Output voltage: 0~15kV (square wave) adjustable;
3 Output current: 0~200mA;
4 Output capacity: 2kVA;
5 Frequency adjustment: Min:0.2Hz, Max:5Hz (adjustable range).

On-site test

Company Profile