Summary

ZW20G-12/630 on-column vacuum circuit breaker is suitable for switching on and dividing load current in overhead lines of three-phase AC 50 Hz.12 kV voltage distribution network. It has the protection function of overload and short-circuit current. It also has the function of automatic reclosing, intelligent controller and external power supply, which can be used as automatic switching device for load allocation. Guan (commonly known as watchdog); used as recloser and segmenter in outdoor distribution network. This product can also realize remote management mode, with automatic protection control and remote communication functions, can reliably judge and detect milliampere single-phase grounding current, automatically identify single-phase grounding fault, and accurately remove inter-phase short-circuit fault. It is an ideal high-voltage switchgear in the construction of intelligent distribution network.

Functions and Characteristics
5.1 function
5.1.1 This vacuum circuit breaker has the functions of closing and dividing load current, protecting overload and short circuit current, and automatic reclosing.

5.1.2 equipped with XB-864 (or XB-821) intelligent controller has the following intelligent functions:

1) Automatically locate single-phase grounding fault. When a single-phase grounding fault occurs in a user's branch line, where and which phases can be detected to have a grounding fault, and what is the grounding current?

2) Automatic isolation of short circuit faults between phases. When the phase short circuit fault occurs in the user branch line, the vacuum circuit breaker trips before the substation protection switch and automatically isolates the fault, which will not affect the normal power consumption of other branch users on the feeder line.

3) Fast fault location. After the protection action of the vacuum circuit breaker is caused by the branch line fault of the user, only the user is responsible for the blackout, and the power company can send the fault information to the electric power management center by himself. If the vacuum circuit breaker is equipped with communication module, the information can be sent to the electric power management Center automatically.

4) Monitoring user system. Vacuum circuit breaker can be equipped with wired or wireless communication accessories to transmit monitoring data to power management center to realize remote real-time data monitoring of user load.

5) Remote operation function. Users can operate vacuum circuit breaker closing and closing through mobile phone short message or computer background.

5.2 characteristics

5.2.1 This vacuum circuit breaker adopts the design scheme of secondary repetitive sealing for the primary high voltage current circuit, that is, the sealed stainless steel case is re-sealed with epoxy resin insulated frame cover for the vacuum interrupter and its primary high voltage current circuit. The sealed stainless steel case and the sealed epoxy resin insulated frame cover are filled with "0" high purity nitrogen gas with self-contained surface pressure. The respirator is connected and the moisture condensation point is ensured to be below - 50 degrees Celsius. This not only solves the problem of condensation, but also eliminates the environmental pollution of sulfur hexafluoride poisonous gas. This kind of structure is scientific, innovative and practical. Even if the stainless steel shell leaks, there is a high voltage current loop sealed by the insulation frame cover, which can ensure the safety and reliability of the product in operation and fill the gap in the domestic and foreign industries.

5.2.2 Explosion-proof and pressure-relief devices are installed on the top of the box body and the cover of the insulation frame of circuit breaker. Even if the accident happens, there will be no high-temperature gas or spatter spraying out, and there will be no danger of combustion and explosion.

5.2.3 Operating mechanism is sealed in high purity nitrogen gas tank with "0" gauge pressure, and is not affected by external conditions. Its performance is safe, stable and reliable.

5.2.4 Vacuum circuit breaker box A, B, C three-phase fully sealed layout, compact structure, compact, small size, light weight, greatly improved the product grade.