HXGN -12 Overview
HXGN口-12（SF6）Unit type AC metal-enclosed ring main unit（hereafter refer to as ring net cabinet）is a new generation of high-pressure electric appliance product designed and developed independently by our own company according to the requirement of the domestic agricultural electricity and the city net transformation after introduction of overseas advanced technology.Each technical performance index completely reaches the IEC298 and GB3906 standard.
The loop-net cabinet s main switch，the operating mechanism and the components is made of the ABB Corporation original piece or the SFL-12/24 switch equipment imported overseas and assembled at home.We can also install the ABB Corporation original piece of HAD/US type SF according to the request of users.The circuit breaker or the VD4-Svacuum circuit-breaker divide into two kinds:be operated manually and electrically according to the operating mode.
The cabinet body is riveted after processed by numerical control machine tool with reliable mechanical interlocking and the mis-operating prevention function.The protection grade reaches IP3X.This product has the remarkable characteristics such as the small volume，light weight，artistic appearance，simple operation，long life，high parameter with no pollution and little maintenance.
HXGN -12 Use environmental conditions
1. The altitude should not exceed 2000m.2. Surrounding air temperature:-25℃~+40℃
3. Relative temperature: the daily average value is not higher than 95%, the the monthly average value is nothigher than 90%
4. Surrounding air without caustic gas or ignitable gas, steam and other obvious pollution
5. Without fierce vibration
HXGN -12 Using
HXGN -12（SF6）unit type exchange metal ringnet switching equipment，is suitable to exchange 50Hz、12K，searving as device of receiving and distribution of electrical energy.
HXGN £-12 Structural features and working principle
The outline structure of the product is referred to as diagram 1 and diagram 2；the installation dimension is referred to as diagram3.This ring network type cabinet makes air as the insulating medium，mainly assembled with ZFN-10/630 type vacuum load switch.And there are two cabinet schemes-incoming cabinet and outgoing cabinet.
1.Incoming cabinet scheme There is a ZFN口-10/630 type vacuum load switch on the main circuit inside the cabinet with isolating knife，and grounding knife conditionally.The three of them are all installed in one machine stand and there are interlocks among them，so that it is realized to connect the operation of three working stations of bus，isolation and grounding.Inside the cabinet the com-ponents such as CT，PY are available.
2.Outgoing cabinet scheme ZFN口-10/630 type vacuum load switch，fuse with striker（used as isolating switch）and grounding knife on the main circuit inside the cabinet，and the three working stations oper-ation can be realized.Inside the cabinet the components such as CT/
PT and ZNO arrester are available，so the metering cabinet can be omitted.Inside the incoming cabinet and out-going cabinet，there is insulating protecting baffle interlocked with grounding switch.And inside the cabinets，the mechanical interlocks are adopted between each switch and baffle as well as the cabinet door with the requirement of"five-prevention"and IP2X of the protection degree of the cabinet enclosure.
|HXGN -£-12 The main technical parameters|
|Main bus bar rated current fuse breaker maximum rated current||A||630/125|
|Main loop,earthed loop short time endurable rated current||kA/s||20/3|
|Main loop,earthed loop maximum endurable rated current||kA||50|
|Main loop,earthed loop short circuit on-and off rated current||kA||50|
|the opening number of the load switch with full capacity||times||100|
|The fused breaker opening the current||kA||31.5,40|
|Rated closed loop opening current||A||630|
|Rated shift current||A||1600|
|1min line frequency resistance (peak value)recurence,to the earth/isolation fracture||kV||42/48|
|The lighting shock resistance(peak value)recurence,to the earth/isolation fracture||kV||75/85|
|Secondary loop 1min line frequency voltage resistance||kV||2|