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I. Purpose & Scope of Application
The HXGN-12 high-voltage vacuum ring main switch cabinet (called ring main unit for short) is applicable to the distribution system of industrial and mining enterprises, residence communities, high-rise buildings and schools as a power supply unit of indoor three-phase 12KV, 50HZ ring main and a terminal distribution equipment. It may break or close the rated load current and transformer no-load current, and as well break or close the capacitance current of a certain distance of overhead line, cable or condenser bank. The load switch-fuse composite apparatus cabinet is able to break the rated short-circuit current in a one-off way and is used for protecting the equipment, distributing and controlling electric power.
II. Operating environment
Ambient temperature upper limit and lower limit are respectively 40℃ and -25℃;
Altitude is not more than 1000m;
Relative humidity: daily average value should not be more than 95%, while monthly average value should not be more than 90%;
Places without fire and explosion risk and violent vibration, and corrosive and combustible gas, vapor and conducting dust in the ambient air and obvious pollution.
III. Type & Meaning
IV. Main technical parameters
Serial No. |
Item |
Unit |
Value |
1 |
Rate voltage |
KV |
12 |
2 |
Rated current |
Load switch |
A |
630 |
Composite apparatus cabinet |
125 |
3 |
Rated short-circuit making current |
KA |
50 |
4 |
Rated short-circuit breaking current |
KA |
31.5 |
5 |
Rated active load breaking current |
A |
630 |
6 |
4S short time withstand current |
KA |
20 |
7 |
Dynamic current |
KA |
50 |
8 |
1min power frequency withstand voltage |
KV |
42（fracture，48） |
9 |
Lightning impulse withstand voltage |
KV |
75（fracture, 85） |
10 |
Mechanical life |
Times |
10000 |
11 |
Rated take-over current (composite apparatus) |
A |
3150 |
12 |
Mode of operation |
|
Manual mode |
13 |
Degree of protection |
|
IP2X |
VI. The following contents should be specified for ordering
1. Scheme of primary circuit and single wire system diagram;
2. Array diagram and layout plan of ring main unit;
3. Names, specifications and quantity of electric components installed in each cabinet;
4. Operation mode of load switch and type of motor power source and operating voltage;
5. Schematic diagram of ancillary circuit;
6. Type and specification of bus bar of the primary circuit;
7. Coating color of cabinet.
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