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CNH-12/630-20 ENVIRONMENT-FRIENDLY GAS INSULATED RING SWITCHGEAR
Overview
CNH-12/630-20 environmentally friendly gas closed ring network switchgear is a new type of green and environmentally friendly metal enclosed switchgear. It is insulated with environmentally friendly gases such as dry air or nitrogen, with no/less greenhouse gas emissions. The material recyclability rate after the product life cycle reaches 90% % or more, except for the casing, other insulation components basically do not use difficult-to-degrade epoxy resin materials, truly achieving the purpose of being green and environmentally friendly. Both circuit breakers and load switches adopt vacuum arc extinguishing, which has strong environmental adaptability, small size, space saving, no need for SF, gas detection and protection, safe and reliable operation, maintenance-free, and intelligence. It is the future development of ring main unit. direction.
CNH-12/630-20 environmentally friendly gas closed ring network switchgear is used for complete power distribution devices with voltage of 12kV, three-phase AC 50Hz, single busbar and single busbar segmented system, industrial and civil cable ring network and distribution network terminal projects. For the purpose of receiving and distributing electric energy, it is used in power distribution in urban residential areas, small secondary substations, switching stations, cable branch boxes, box-type substations, industrial and mining enterprises, shopping malls, airports, subways, wind power generation, hospitals, and stadiums. , railways, tunnels and other places.
Product Main Features
◆Complex functional and integrated products
The inflatable shell of the switchgear is made of high-quality 2.5mm thick stainless steel plate through laser welding to ensure the air box sealing reliability, high mechanical strength and good corrosion resistance. The protection level of the inflatable shell reaches IP67: the air box is equipped with The explosion-proof diaphragm can effectively prevent damage to people and equipment when the air pressure is too high; sealing all conductive parts in the air box can not only avoid the influence of external environmental factors, but also improve operational reliability, making it maintenance-free. (or less maintenance) function, while also meeting the requirements of miniaturization.
The main circuit uses a combination of a three-position switch (on + isolation + grounding) and a vacuum interrupter. This structure is a technically mature configuration method and is suitable for current power grid operation and maintenance needs.
◆Environmentally friendly and pollution-free
The insulating medium of CNH-12/630-20 environmentally friendly gas closed ring network switchgear is zero-level dry air (outsourced) or 99.99% pure N2 in compliance with GB/T 8979-2008. Gas leakage will not have any impact on the external environment and does not need to be carried out. Any recycling processing.
◆Flexible expansion design
CNH-12/630-20 environmentally friendly gas closed ring network switchgear is modular in design, and various modules can be connected through dedicated busbar connectors. Achieve diversified unit combinations to meet the complex and diverse power distribution design schemes in various places in China to the greatest extent.
◆Perfect mechanical interlocking
The operation panel of the CNH-12/630-20 environmentally friendly gas closed ring network switchgear has a complete five-proof mechanical interlocking function. All interlocking functions have been configured internally. Please operate according to the order of the operating instructions. It is very convenient to use.
The Main Technical Parameters
| Project | Unit | parameter | ||
| Rated voltage | KV | 12 | ||
| Rated frequency | Hz | 50 | ||
| Rated insulation level | 1min power frequency withstand voltage | To the ground, to ask each other | KV | 42 |
| Isolate fracture | 48 | |||
| Lightning impulse withstand voltage [peak value] | To the ground, to ask each other | KV | 75 | |
| Isolate fracture | 85 | |||
| 1min power frequency withstand voltage of auxiliary worker control circuit (to ground) | KV | 2 | ||
| Rated current | A | 630 | ||
| Rated short-time withstand current (effective value) | Main circuit/ground switch | 25/4s | ||
| Ground connection loop | THE | 21.7/4s | ||
| Rated peak withstand current | Main circuit/ground switch | THE | 63 | |
| Ground connection loop | THE | 54.5 | ||
| Rated short circuit making current (peak value) | Load switch/grounding switch | THE | 63 | |
| Rated active load breaking current | A | 630 | ||
| Rated closed loop breaking current | A | 630 | ||
| 5% rated active load breaking current | A | 31.5 | ||
| Rated cable charging breaking current | A | 10 | ||
| Rated active load breaking times | Second-rate | 100 | ||
| Ground fault current interrupting | Second-rate | 31.5/10 | ||
| Line and cable charging current interruption under ground fault conditions | A/Second-rate | 17.4/10 | ||
| Machine capture life | Circuit breaker/isolating switch | A/Second-rate | 10000/3000 | |
| Protection level | sealed body | IP67 | ||
| switchgear housing | IP4x | |||
| gas pressure | Rated gas filling level (20℃, gauge pressure) | Mpa | 0.02 | |
| Gas* functional level (20°C, gauge pressure) | Mpa | 0 | ||
| Sealing performance | annual leakage rate | %/Year | ≤0.05 | |