Cable Locating Device

I. Introduction

EDDQ-3 High-Voltage Cable Outer Sheath Fault Locating DeviceBased onBased on the MURRAY bridge principle and designed forPost-laying breakdown points of various wires and cables, as well as defect points with low insulation resistance but no 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 a switch-mode power supply to form a high-voltage constant current source, with no-load voltage- 15,000V, short-circuit current of 30mA. Utilizing a high-sensitivity amplifier and a galvanometer to indicate balance, the device is configured as a balanced bridge with a potentiometer in proportion, and the entire assembly is positioned at a high potential. The test wires are specially designed double-core high-voltage rubber cables. The four-terminal resistance measurement method is employed to avoid errors introduced by lead resistance. The test wires are securely grounded through a woven shielding layer, and the control buttons on the panel are at ground potential, allowing the bridge to be operated via an insulating rod. The high-voltage constant current source and bridge are integrated into a portable industrial enclosure. Therefore, the equipment features high voltage, low weight, ease of operation, and safe use.

Function and Application

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

DC Voltage Withstand TestEquipment outputThe direct current (DC) voltage of 0-15kV is suitable for cable DC withstand voltage tests.

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

3. Fault Pre-LocationUtilizing 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 breakdown voltage after laying, especially for linear high breakdown voltage points that are difficult to achieve low resistance, such as the linear high breakdown voltage of cable intermediate joints.

2、Flashover breakdown points can sustain an arc with a constant current source post-breakdown, allowing for a stable current to pass through the bridge, which possesses sufficient sensitivity.

3、Insufficient puncture but low-resistance defect points, such as where the cable resistance is found to be low on a megohmmeter, but 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 user categories:：

1. Professional cable maintenance and testing teams: such as cable maintenance teams in large and medium-sized power supply bureaus and large-scale power-consuming enterprises. The majority of cable breakdown points can beEDDQ—3Quickly locate the approximate penetration point. By combining the wave reflection method and the positioning instrument, we leverage each technique's strengths to achieve faster and more reliable positioning.

2. Small-scale Users: Such as small-scale power supply offices and medium-sized power-consuming enterprises. Cables are not many, generally with a clear path, not too long, and limited in the number of faults. If a complete set of wave reflection locator is chosen, it is expensive, and it requires a high level of quality and experience from the users, making it not a favorable choice. Selection ofEDDQ-3 High-Voltage Cable Outer Sheath Fault Locating Instrument，Affordable, easy to operate, and capable of meeting daily needs, it is a good choice.

3. Cable Manufacturing Plant: On-site, this equipment is used for pinpointing various cable breakdown points. With the selection of a digital capacitance meter, it can locate broken wire points. The device is lightweight and easy to carry to the site for cable user positioning services.