Cable Fault Instrument

Basic Features:

Equipment incorporates a switch-mode power supply to form a high-voltage constant current source, with no-load voltage-15000VShort-circuit Current30mAUtilizing high-sensitivity amplifiers and galvanometers for balance indication, combined with a proportional potentiometer to form a balanced bridge, the entire setup is positioned at a high potential. The test lines are specially designed double-core high-voltage rubber cables, employing a four-terminal resistance measurement method to avoid errors introduced by lead resistance. The test lines are reliably grounded through a woven shielding layer, with the panel buttons at ground potential and the bridge operated via an insulated rod. The high-voltage constant current source and the bridge are integrated into a portable industrial enclosure. Therefore, this equipment boasts high voltage, light weight, ease of operation, and safe use.

Technical Features:

EDDQ—3The fault locator for high-voltage cable outer sheath has three functions:

1DC High-Voltage Test: The equipment can output0～15kVDirect current voltage, suitable for cable DC withstand tests.

2Penetrating fault points: Penetrating through and reducing the resistance of burn-through and high-resistance as well as flashover fault points.

3Fault Pre-Location: Utilizing the bridge principle for pre-location, the four-terminal resistance measurement method avoids errors introduced by lead resistance.

At the same time,EDDQ—3High-voltage cable outer sheath fault locator is particularly suitable for:

1Post-installation cable high breakdown voltage points, particularly the linear high breakdown voltage points that are difficult to achieve low resistance, such as the linear high breakdown voltage points of cable intermediate joints.

2Flashover breakdown points, after breakdown, the constant current source can maintain the arc, with a stable current passing through the bridge, which has sufficient sensitivity.

3Defect points with low resistance but no puncture, such as insulation defects that do not puncture under operating voltage, which are discovered by megohmmeters to have lower cable resistance.