Kehui T-907 Power Cable Fault Locator

The Kehui T-907 Power Cable Fault Locator is a state-of-the-art device that can be used to pre-locate all kinds of faults in low, medium, and high-voltage power cables. The device is designed to be portable and lightweight, making it easy to carry around and use in the field. The T-907 can operate in four modes: Time Domain Reflectometry (TDR), Secondary/Multiple Impulse Method (SIM/MIM), Impulse Current Method (ICM), and Decay Method.

Features

The Kehui T-907 Power Cable Fault Locator has several features that make it an ideal tool for pre-locating faults in power cables. The device is equipped with a separate wireless display on a tablet computer, which enhances both the quality and safety of the system. The display also adds data communication and photography of site conditions. The T-907 can operate in four modes: Time Domain Reflectometry (TDR), Secondary/Multiple Impulse Method (SIM/MIM), Impulse Current Method (ICM), and Decay Method. The device is lightweight and portable, making it easy to carry around and use in the field.

Working Principle

The Kehui T-907 Power Cable Fault Locator works on the principle of pre-location techniques. A power cable fault is unlikely to exhibit sufficiently low resistance to allow a Time Domain Reflectometry (TDR) pulse to be reflected, and it is usually necessary to modify the fault to create a situation where it is suitable for pre-location techniques to be applied. This is carried out using a surge generator to inject energy into the cable. This energy converts the fault such that the fault becomes low-resistance, allowing the use of TDR to measure the distance to the fault.

The TDR injects impulse onto the cable and compares the reflection from the cable before and during the arcing. The deviation of the signals represents the distance to the fault position based on time and a known pulse propagation velocity. This technique allows the approximate position of the fault to be determined. The exact location will then be identified through pinpointing.

Applications

The Kehui T-907 Power Cable Fault Locator can pre-locate all kinds of faults in low, medium, and high-voltage power cables. The device can be used for open circuit faults, short circuit faults, low-resistance faults, high-resistance faults, and flashovers. The device is lightweight and portable, making it easy to carry around and use in the field.

Kehui T-907 Power Cable Fault Locator Specifications:

• Measuring range: 64km
• Fault location methods: TDR, ICM, SIM/MIM and Decay
• Voltage of transmitting pulse: 30V
• Width of transmitting pulse: 40ns -7μs
• Voltage withstand: 400V AC (50/60Hz)
• Output impedance: 5-87Ω
• Sampling rate: 200MHz (5ns)
• Display: Independent wirelessly connected 8” tablet
• Charger (Main unit): Input: 110V – 240V AC; Output 8.4V DC, Current 3A
• Charger (Tablet): Input: 100V – 240V AC; Output 5V DC, Current 3A
• Weight (Main unit): 2.8kg
• Weight (Tablet): >1kg
• Dimensions (Main unit): 270 x 250 x 120mm
• Dimensions (Tablet): 2270 x 140 x 18mm
• Operating temperature: -10o to +50oC
• Ingress protection: IP54: Splash proof and dust protected (when closed)
• Storage temperature: -20 to +50°C