A cable or cable overhead hybrid line, referred to as a overhead line-cable hybrid line, is a type of electric power transmission and distribution line that combines the use of overhead lines and cable lines. In this hybrid line, overhead lines and cable lines can be flexibly combined according to the actual demand, in order to achieve the purpose of improving the power transmission and distribution capacity and reducing the system outage rate. Compared with pure overhead lines or pure cable lines, hybrid lines cost less, can save the initial investment and daily operating costs, especially in the urban power grid renovation, power grid construction in new areas and special terrain conditions of power transmission and distribution, hybrid lines are playing an important role. So, for their "old diagnosis", can be realized in what way?
Our High Voltage Cable Fault Early Warning and Localization Device DX-WPS100-GZ02 is used to quickly and accurately Detect and locate fault points in cable lines quickly and accurately, and realize fault identification based on fault waveforms. Adopting the method of cable joint ground current + temperature monitoring, the device is usually installed at the cable joint. The distributed traveling wave algorithm is utilized to achieve fault point localization when the cable length is known.
Key Features:
1、Signal Acquisition: Adopting the structure of one host and multi-channel, the whole frequency band covers the signal of common fault types, and it can simultaneously acquire 7 high-frequency signals (3 high-frequency current traveling wave, 3 hidden current traveling wave, 1 voltage traveling wave) and 8 low-frequency signals (3 industrial frequency current, 4 ground loop current, 1 voltage);
2, timing: in order to ensure the strict synchronization of the signal at both ends, timing module through the satellite or fiber optic clock synchronization, accurate recording of the time when the traveling wave arrives at both ends of the line;
3, fault location: based on the principle of traveling wave positioning, can be quickly calculated after the cable fault occurs, the fault interval and the location of the fault point;
4, fault identification: through the A, B, C three-phase current traveling wave, industrial frequency fault current traveling waveform analysis, can intelligently identify the type of fault, such as unidirectional grounding, phase-to-phase short circuit;
5, fault early warning: by monitoring the strong traveling wave signals at both ends of the cable, it can realize the fault early warning of defective cable joints and body.
CT power extraction: Built-in high-precision CT power extraction coil + power conversion module. Support solar energy, utility external access, battery capacity 20Ah.
technical specification
1, fault location accuracy: ≦ L * 0.5% +5m (L is the length of the cable)
2、Synchronization error：＜20ns
3, grounding current sampling range: 0 ~ 300A
4, traveling wave current sampling range: 10mA ~ 1000A
5、Hidden current sampling range：10mA～10A
6, temperature monitoring range: -45 ℃ ~ +125 ℃
With the development of smart grid, high-voltage cables, as an important part of the grid, are of irreplaceable importance to ensure the stable operation of the power system and to promote socio-economic development, and the The application of high-voltage cable fault early warning and positioning device also further enhances the intelligent level of the power grid and the reliability of power supply.
