With the rapid development of power and computer industry, how to better improve the reliability and flexibility of power system, enhance the ability of fault analysis and processing, communication and event recording of intelligent switch in power grid become more and more users of power grid The focus of the problem.
During the "12th Five-Year Plan" period, it is a comprehensive construction phase of a strong smart grid. How to make the user's power supply more "strong", that is, to quickly identify the fault, isolate the fault and restore the power supply, and put forward higher requirements on a device's intelligence.
In order to meet the current user requirements for automation of the entire power system, Zhuhai Kang Jin Electric Co., Ltd. for medium voltage cables and overhead lines and other secondary distribution system design and development of several intelligent primary equipment, such as intelligent solid-insulated ring switchgear , Intelligent SF6 ring switch equipment, intelligent outdoor vacuum circuit breakers / load switches. Their main features are small, intelligent, environmentally friendly and so on. Currently used in power grids and has been well received by users.
Switch must ensure the reliability of power system operation. Intelligent switch development trend is to ensure the reliability of the switch on the basis of the switch to achieve the miniaturization, intelligence and environmental protection.
2 smart switch to achieve the function
Intelligent fault location, isolation and self-recovery power supply
Fault areas can be divided, precise positioning, fault isolation, non-fault area power loss recovery, and with the terminal acquisition module fault detection and identification. Different network for the wiring, fault location, isolation and automatic recovery of power supply systems using different ways
Event Sequence Record SOE
Resolution to reach 1MS.
other functions
Remote control, remote signaling, remote adjustment; report browsing print; regional main wiring diagram; automatic meter reading function; trend curve analysis; operating authority control; protection of fixed value modification; self- diagnosis function: equipment can enter diagnosis and remote diagnosis function Check the status of the main function modules, equipment and power supply; module using fault-tolerant technology and watchdog technology to ensure program self-recovery, completely eliminate the phenomenon of death; can adopt the standard communication protocol with a variety of intelligent devices through the communication interface, the protocol conversion , And can be well linked with the dispatch system; monitoring can take the form of centralized monitoring or distributed monitoring.
3 environmental protection, miniaturization characteristics
The root cause of the warming of the earth lies in the emission of SF6 gas, and the state also regards environmental construction as an important part of national construction. The "Tokyo Protocol" has made it clear that in the future to limit the emissions of SF6 gas, so the future of solid-insulated ring network switchgear will replace SF6 inflatable cabinets will become inevitable.
In the land today, the small switch is undoubtedly of great practical significance. Such as Kang Jin electrical company's smart inflatable cabinet, the volume is very small, cabinet width of a unit 371MM and so on. And based on solid pole sealed cabinet, the cabinet width of only 650mm, relative to the 800mm cabinet width, the volume is greatly reduced.
4 new solid-insulated ring network switchgear
Zhuhai Kang Jin Electric Co., Ltd. solid-insulated ring switch equipment is in line with this trend of the product.
Kang Jin Electric Company's solid-insulated switchgear to achieve a green, pollution-free, small size, safe and reliable and intelligent combination of a new generation of maintenance-free products. Its single product width 420mm, depth 750mm, height 1400mm, can be used alone and can be combined. Is the perfect combination of vacuum technology and insulation technology, can completely replace the SF6 gas as breaking and insulation, in line with the national promotion of electrical products to reduce emissions. The controller features directional ground protection that distinguishes between in-zone / out-ground faults and forms an intelligent distribution network that can be quickly restored to power and is well-connected to the dispatch center.
The main components constitute
CKSS solid insulated switch mainly consists of three components, namely V unit (circuit breaker unit), C unit (load switch unit), F unit (combined electrical unit), each unit can be used alone or can be freely expanded, the structure of points For the instrument room, the operating mechanism and a part of the instrument room can be equipped with microcomputer protection (controller), institutions for the special elastic body, a part of the APG automatic gel process, the isolation switch and interrupter completely fixed in the epoxy Resin, and a dedicated connector and bus connected.
Interrupter design
The arc-extinguishing chamber of the switch is made of special copper-chromium contact material, R-type longitudinal magnetic field contact, and a complete sealing process. The interrupter has the capability of breaking the short-circuit current and the stability, the electrical life, the temperature rise and the insulation level Before the arc taught arc chamber (copper and aluminum contact material, cup vertical magnetic field contact structure, and incomplete sealing process) has been significantly improved.
Actuator design
The mechanism adopts the spring-loaded mechanism which is integrated with the switch, that is, the isolation switch and the main switch spring-loaded mechanism are integrated as a whole, the interlocking can be conveniently realized, the parts of the cutting mechanism are few, the unnecessary transmission parts are reduced, the reliability is high, Users need to be equipped with manual, electric operation.
A part of the process design
Part of the switch using APG automatic gel process, the conductive loop completely fixed in the epoxy resin, and three-phase split, this design fully take into account the national standards and the requirements of the use of brutal environment, with flood-touch Dedicated plug, and computer protection truly sealed, fully insulated, maintenance-free, miniaturized, intelligent power distribution requirements.
Controller Design
With directional grounding protection, can distinguish between regional / external ground fault, which can effectively form a regional distribution automation system, and can well contact with the dispatch center.
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