High voltage bridge tester

oneIntroduction

The DGC-2018 cable fault intelligent positioning bridge is designed based on the principle of MURRAY bridge, and is suitable for locating the breakdown points of various wires and cables after laying, as well as defect points with low insulation resistance values but no breakdown, and for locating faults in the outer sheath of high-voltage cables. Of course, it can also be used for defect location of various cables in cable factories.

High voltage bridge testerA switch power supply is used to form a high-voltage constant current source, with a no-load voltage of -15000V and a short-circuit current of 30mA. A high-sensitivity amplifier and ammeter are used to indicate balance, and a balance bridge is formed with a proportional potentiometer, which is placed at a high potential as a whole. The test line is a specially designed dual core high-voltage rubber cable, which uses a four terminal resistance measurement method to avoid errors caused by lead resistance. The operation button on the panel is at ground potential, and the bridge is operated through an insulating rod. The high-voltage constant current source and bridge are integrated into a portable industrial plastic chassis. Therefore, the device has high voltage, light weight, easy operation, and safe use.

2、 Functions and Applications

The DGC-2018 cable fault intelligent positioning bridge has three functions:

1. DC withstand voltage test: The equipment can output a DC voltage of 0-15kV and can be used for cable DC withstand voltage test.

2. Burn through fault point: Burn through and reduce the resistance of high resistance and flashover fault points.

3. Fault pre positioning: Using the bridge principle for pre positioning, the four terminal resistance measurement method avoids errors introduced by lead resistance.

Meanwhile,High voltage bridge testerThe intelligent positioning bridge for cable faults is particularly suitable for:

(1) After laying, the high resistance piercing points of the cable, especially the linear high resistance piercing points that are difficult to burn into low resistance, such as the linear high resistance piercing of the middle joint of the cable.

(2) Flashover type breakdown point, after breakdown, the constant current source can maintain the arc, and a stable current passes through the bridge, which has sufficient sensitivity.

(3) Defects that have not yet been broken down but have low resistance, such as insulation defects found in cables with low resistance using a megohmmeter but do not break down under operating voltage.

Due to the above characteristics, the intelligent positioning bridge for cable faults is favored by the following types of users:

1. A cable repair and testing team engaged in professional positioning, such as cable repair and testing teams of large and medium-sized power supply bureaus and large power consumption enterprises. The vast majority of cable breakdown points can be quickly located using cable fault intelligent positioning bridges to roughly locate the breakdown location. When used in conjunction with wave reflection method and fixed-point instrument, each takes its own strengths to make positioning faster and more reliable.

2. Small scale users: such as small power supply bureaus and medium-sized electricity consuming enterprises. There are not many cables, and the general direction is clear and not too long. The number of faults is limited. If a set of wave reflection positioning devices is equipped, the price is high, and the quality and experience of the users are required, which is not *. Choosing an intelligent cable fault location bridge is a good choice due to its low price, easy operation, and ability to meet daily needs.

3. Cable production factory: In the factory, it can be used to locate various cable breakdown points, and a digital capacitance meter can be selected to find the disconnection point. This device is lightweight and easy to carry to the site to provide positioning services for cable users.

3、 Technical indicators

1. Test voltage: Negative high voltage, 0-15kV, continuously adjustable

2. Maximum current: 30mA

3. Test proportion accuracy: ± (0.2% · L ± 1) meters

4. Burn through voltage: 0-15kV, continuously adjustable

5. Burn through current: 30mA

6. Working power supply: AC220V ± 10%

7. Anti interference capability:>100VAC

8. Weight: ≤ 12kg

9. Dimensions: L450mm × W330mm × H320mm