China Factory Electrical High Voltage Bridge Underground Cable Sheath Fault Pre Locator

• Customization: Available
• After-sales Service: After Sale Service
• Warranty: 12 Months
• Model NO.: XHHG521C
• Power: Electricity
• Certification: CE, ISO
• Customized: Customized
• Transport Package: Exported Wooden Case
• Trademark: XZH TEST
• Origin: China
• HS Code: 9031809090
• Production Capacity: 2000PCS/Year

Product Description

Introduction
The high-voltage bridge is designed based on the MURRAY bridge principle and can be used to locate the breakdown points of various wires and cables after laying and the defect points that have no breakdown but low insulation resistance values. Of course, it can also be used to locate defect points of various cables in cable factories.

The equipment uses a switching power supply to form a high-voltage constant current source, with a no-load voltage of 15000V and a short-circuit current of 50mA. It uses a high-sensitivity amplifier and galvanometer to indicate balance, and forms a balanced bridge with a proportional potentiometer. The whole is placed at a high potential. The measurement cable is specially designed The double-core high-voltage rubber cable uses the four-terminal resistance measurement method to avoid errors caused by lead resistance. The cable is reliably grounded through the braided shielding layer. The operating button on the panel is at low potential, and the bridge is operated through the insulating rod. The high voltage constant current source and bridge are integrated in a portable aluminum alloy box. Therefore, the device has high voltage, light weight, easy operation and safe use.

Compared with the wave reflection method, the bridge balance method has no blind spots and is especially suitable for judging short cables and breakdown points near the ends, and is easy to operate.

Features
ØOutput voltage is adjustable;
ØThe impact frequency is adjustable;
ØWith over-current protection;
ØThere is no blind area in the test range;
ØSignal frequency adjustment;
ØZero protection.

High voltage bridges are particularly suitable for
1. The high-resistance breakdown point of the cable after laying, especially the linear high-resistance breakdown point that is difficult to burn into low resistance, such as the linear high-resistance breakdown of the cable intermediate joint.
2. Flashover type breakdown point. After breakdown, the constant current source can maintain the arc, a stable current flows through the bridge, and the bridge has sufficient sensitivity.
3. Defects that have not yet broken down but have low resistance, such as insulation defects found with a megohmmeter that have low cable resistance but do not break down under the operating voltage.

Due to the above characteristics, the high-voltage high-voltage bridge is particularly suitable for the following users:
Teams engaged in professional positioning: such as cable repair trials for large and medium-sized power supply bureaus and large power-consuming enterprises. For most cable breakdown points, a high-voltage bridge can be used to quickly find the approximate breakdown location. Used in conjunction with the wave reflection method and positioning instrument, it can complement each other's strengths and make positioning faster and more reliable.
1. Small users: such as small power supply bureaus and medium-sized electricity enterprises. There are not many cables, generally the direction is clear, not too long, and the number of failures is limited. If equipped with a set of wave reflection method locators, the price is high, and it requires high quality and experience of the users, so it is not the best choice. It is a better method to choose this device because it is easy to operate and can meet daily needs.
2. Cable manufacturer: In the factory, it can be used to locate the breakdown points of various cables. The optional digital capacitance meter can find the break point. The device is lightweight and easy to carry to the site to provide positioning services for cable users.



Technical specification

Input voltage	AC 220V (±10%), 50/60Hz (±2Hz);
No-load voltage	≥15000V;
Short circuit current	≥50mA;
Positioning ratio accuracy	±(0.2%·L±1) meters;

Panel description




1. Power socket: instrument working power supply, AC 220V connection port;

2. Fuse holder: The installation place of the fuse of AC 220V power supply system;

3. Ammeter: output current indication mA meter;

4. Voltmeter: high voltage output voltage indication kV meter;

5. High-voltage indicator light: When there is high-voltage output, this light is on. Press this button. If there is no high-voltage output, this light is off;

6. Power switch: "I" turns on the AC 220V power supply switch, "0" turns off the system power;

7. Voltage adjustment: After starting the equipment, you must first turn the knob counterclockwise to the end. When the high voltage indicator light is on, then adjust it clockwise to increase the output high voltage from small to large, and adjust it counterclockwise to decrease the output high voltage from large to small;

8. Zero adjustment: Rotate the zero adjustment button to make the galvanometer point to zero;

9. Balance adjustment: Adjust the balance knob until the galvanometer deflects significantly so that the galvanometer points to zero. (If the pointer is to the left, rotate clockwise; if the pointer is to the right, rotate counterclockwise). Observe and record its reading P1;

10. Adjust the magnification: turn counterclockwise to decrease the magnification, turn clockwise to increase the magnification;

11. Galvanometer: electrical balance zero point is adjustable;

12.C1P1: Connect to the reference phase (red clip);

13.C2P2: Connect the faulty phase (black clip);

14. Grounding post: instrument grounding point, safety protection.


Packing list

Main unit	1set
Output lines	2pcs
Power cable	1pcs
Ground wire	1pcs
Short wire	1pcs

Onsite use

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