Cable Breakpoint Tester

I. Introduction

EDDQ-3 High-Voltage Cable Outer Sheath Fault Locating InstrumentBased onMURRAY bridge principle designed, suitable forPost-laying breakdown points of various electrical cables and defects with low insulation resistance values but without breakdown.The positioning, andFault in High-Voltage Cable Outer SheathOur positioning. Of course, it can also be used for...Defect points of various cables within the cable factoryPositioning.

Equipment utilizes switch-mode power supply to form a high-voltage constant current source; no-load voltage- 15,000V, short-circuit current of 30mA. Utilizes a high-sensitivity amplifier and galvanometer for balance indication, forming a balanced bridge with a proportional potentiometer, all mounted at a high potential. The test cable is a specially designed double-core high-voltage rubber cable, employing a four-terminal resistance measurement method to avoid errors from lead resistance. The test cable is reliably grounded through a woven shielding layer, and the control buttons on the panel are at ground potential, with the bridge operated via an insulated rod. The high-voltage constant current source and the bridge are integrated into a portable industrial enclosure. Therefore, the equipment is characterized by high voltage, light weight, ease of operation, and safe use.

II. Features and Applications

    EDDQ-3 High-Voltage Cable Outer Sheath Fault Locating InstrumentEquipped with three functions:

DC Voltage Withstand TestEquipment output0-15kV DC voltage, suitable for cable DC withstand voltage testing.

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

3. Fault Pre-locationUsing the bridge principle for preliminary positioning, the four-terminal resistance measurement method eliminates errors introduced by lead resistance.

At the same time,EDDQ-3 High-Voltage Cable Outer Sheath Fault Locating InstrumentEspecially suitable for:

1、High dielectric breakdown points of cables after laying, especially the linear high dielectric breakdown points that are difficult to achieve low resistance, such as the linear high dielectric breakdown points of cable intermediate joints.

2、Arcing-through breakdown points, after breakdown, the constant current source can maintain the arc, with a stable current passing through the bridge, which possesses sufficient sensitivity.

3、Insufficient puncture but low resistance defects, such as when a megohmmeter detects lower cable resistance, yet the insulation does not puncture under operating voltage.

Due to the aforementioned features,EDDQ-3 High Voltage Cable Outer Sheath Fault Locating InstrumentPreferred by the following types of users:：

1. Professional Cable Maintenance Teams: Such as cable maintenance teams in large and medium-sized power supply bureaus and large-scale power consumers. The majority of cable breakdown points can be addressed.EDDQ—3Quickly identify the approximate penetration location. When used in conjunction with the wave reflection method and the positioning instrument, leveraging each technique's strengths, the location process becomes faster and more reliable.

2. Small-scale Users: Such as small power supply bureaus and medium-sized power-consuming enterprises. Cables are not numerous, usually with a clear path, not very long, and a limited number of faults. If a full set of wave reflection locator is equipped, it is expensive, and it requires a high quality and experience level for the users, making it not an ideal choice. Selection:EDDQ-3 High-Voltage Cable Outer Sheath Fault Locating Instrument，Priced affordably, user-friendly, and capable of meeting daily demands, it's a good choice.

3. Cable Manufacturing Factory: On-site, this equipment is used for locating various cable breakdown points. By pairing with a digital capacitance meter, it can pinpoint wire breaks. The device is lightweight and easy to carry to the site for cable user location services.