Cable Fault Detection Equipment - Yangzhou Darui - Yangzhou Darui Electric Co., Ltd.

Cable Fault Detection Equipment - Yangzhou Darui

Published: 2024-07-01 12:29:37

Category: Cable Fault Tester

Product Description

Cable Fault Detection Equipment

Darui Electric recommends:

Cable Fault Detection Instrument (English Name: Cable Fault Detector) is a comprehensive cable fault detection instrument. It can test high-resistance flashover faults, high and low resistance grounding, short circuits, cable breaks, poor contact and other faults.

Technical Indicators

1. Maximum test distance: 32km

2. Detection blind zone: 1m

3. Reading resolution: 1m

4. Power consumption: 5VA

5. Operating conditions: ambient temperature 0℃～+40℃ (extreme temperature -10℃～+50℃)

Relative humidity 40℃ (20～90)%RH

Atmospheric pressure (86～106) Kpa

6. Volume: 225×165×125mm3, Weight: 2kg

1 Traditional cable fault detection methods

1.1 Resistance bridge method

This method has remained almost unchanged for decades. For short-circuit faults and low-resistance faults, this method is quite convenient. The bridge method uses the principle that when the bridge is balanced, the product of the corresponding bridge arm resistances is equal, and the cable length is proportional to the resistance.

1.2 Low-voltage pulse reflection method

The low-voltage pulse method is also called time-domain reflectometry (TDR), which refers to the pulse reflectometer independently measuring low-resistance and open-circuit faults of cables without passing through a high-voltage impulse generator.

1.3 Pulse voltage sampling method

The pulse voltage sampling method, also known as the impulse high-voltage flashover method, is a test method used to measure high-resistance leakage and flashover faults. First, the cable fault is broken down under DC or impulse high-voltage signals, and then the distance is measured by recording the time required for the discharge pulse to travel back and forth between the measurement point and the fault point. The pulse voltage method mainly includes DC high-voltage flashover (direct flash method) and impulse high-voltage flashover (impulse flash method).

1.4 Traditional methods for cable fault pinpointing

① Acoustic method

This method uses the breakdown discharge sound of the fault point under high-voltage impulse for precise location.

② Acoustic-magnetic synchronization method

Traditional Methods

1.1 Resistance bridge method

1.2 Low-voltage pulse reflection method

1.3 Pulse voltage sampling method

1.4 Traditional methods for cable fault pinpointing

① Acoustic method

This method uses the breakdown discharge sound of the fault point under high-voltage impulse for precise location.

② Acoustic-magnetic synchronization method

③ Audio induction method

When applying impulse DC high voltage to the cable to cause the fault point to discharge, a pulse magnetic field is generated around the cable. When receiving the pulse magnetic field signal during acoustic pinpointing, it can be considered that the discharge sound is emitted from the cable fault point.

③ Audio induction method

This method is generally used to detect low-resistance faults. Its principle is: use a 1kHz audio signal generator to inject audio current into the cable under test, causing the cable to emit electromagnetic waves. Receive the electromagnetic field signal on the ground, amplify it, and then send it to earphones or an indicator instrument. Determine the fault point location based on the sound intensity or the indicator value.

Note: The above information and technical parameters are compiled and released by Yangzhou Darui Electric Co., Ltd.

← Previous
高压Cable Fault Tester-扬州达瑞 Next →
ZMY-2000 Direct Buried Cable Fault Tester - Yangzhou Darui

Product Details