Coaxial High Voltage Cable Fault Locator Underground Tdr Cable Fault Tester

• Customization: Available
• After-sales Service: Life Time Support
• Warranty: 1 Year for Cable Fault Locator Equipment
• Model NO.: GD-TC
• Type: Coaxial High Voltage Cable Fault Locator Undergrou
• Accuracy Grade: 0.5
• Load Way: Electronic Load
• Loading Method: Static Load
• Display: Digital
• Control: Digital Control
• Weight: Less Than 2kg
• Power Source: AC220V
• Item: Coaxial High Voltage Cable Fault Locator Undergrou
• Maximum Detect Distance: 30km
• Detect Resolution: 1m
• Sample Rate of Impulse Signal: 100MHz
• Maximum Saved Records: 100 Groups
• Power Consumption: 5va
• Voltage Divider Ratio: 100:1
• Size: 225*165*125mm
• Transport Package: Packed in Container
• Specification: packing in 3 cases
• Trademark: GOLD
• Origin: Chongqing
• HS Code: 9031809090
• Production Capacity: 100PCS/Month Hipot Tester

Product Description

Coaxial High Voltage Cable Fault Locator Underground Tdr Cable Fault Tester

Description of Cable Fault Locator

A cable fault locator is a device used to locate faults or damage in cables, such as insulation faults, that can lead to voltage breakdowns . To locate a fault in a cable, the cable must first be tested for faults. Cable testing is usually performed before cable fault location. During the cable test, flash-overs are generated at weak points in the cable, which can then be localized .

Cable Faults
Cable faults are damage to cables which effect a resistance in the cable. If allowed to persist, this can lead to a voltage breakdown. There are different types of cable faults, which must first be classified before they can be located.
The insulation of the cable plays a significant role in this. While paper-impregnated cables are particularly susceptible to external chemical and thermal influences, in high-voltage PE or XLPE cables the polyethylene insulation of the conductor is affected, leading to partial breakdowns and cracks that "eat away" the insulation.
 

Screening faults

A contact between conductor and screen generates a varying resistance.

Phase faults

The contact between multiple conductors generates a varying resistance.

Sheath faults

Sheath faults are damage of the cable sheath that allows the surroundings contact with the cable screen.

Faults due to moisture

Water penetrates into the cable sheath and contacts the conductors. Impedance changes at the fault location make measuring more difficult. The resistance usually lies in the high-ohmic range.

Disruptions

Combination of series and parallel resistances, usually in the form of a wire break. The voltage is interrupted, i.e. Ω=∞ .

 Methods used for cable fault location
 

1. Pulse Reflection Method: In this method, a pulse is induced at the starting end of the cable, which reaches the cable fault and is reflected back toward the starting end of the cable. The elapsed time multiplied by the diffusion speed gives the distance to the source of the fault .
2. Route Tracing and Pinpointing: Route tracing is used to determine where the faulty cable lies, while pinpointing is the process of determining the exact position of the cable fault .
3. Loop Tests: There are two popular loop tests for finding the location of faults in underground cables: the Murray loop test and the transient method .
4. The Murray loop test employs the principle of the Wheatstone bridge for locating the fault. It requires a sound cable running alongside the faulty cable. The distance to the fault location is calculated by solving the bridge equation .
5. Cable Identification: In cable identification, faulty cables are identified from the fault-free cables at the already determined site .
6. Fault Conversion: After the cable fault is identified and located, it is possible to "burn it in" using burner devices, converting it from a high-impedance fault to a low-impedance fault. Cable Test Van: Cable test vans are conventionally used for cable fault testing and location. These vans are equipped with cable measuring systems for quickly reaching the location of any cable fault .

Accessories of Cable Fault Locator
 

Panel introduction of Cable Fault Locator



Specification of Cable Fault Locator
 

Maximum detect distance	30km
Detect resolution	1m
Power supply	AC220V 10% 45~65Hz,Battery support in the tester
Sample rate of impulse signal	100MHz
Voltage series of cable can be test	Low voltage power cable(0~lkV), high voltage power cable(lkv~35kv) and communication cable
Fault type	Disconnection of power cable, Low insulation of powercable(High voltage impulse generator is required), Low resistance and high resistance connected to earth and poor contact of connectors
Maximum saved records	100 groups
Power consumption	5VA
Voltage divider ratio	100:1
Size	225*165*125mm
Weight	Less than 2kg
Work temperature	0-50 Celsius degree