This product is a medium-voltage switchgear independently developed by Zhejiang Juhonkia Electric Co., Ltd., complying with State Grid’s standardized customization requirements. Adopting a modular design, it can realize the combination of common-box and extended units. All live parts are sealed in a stainless steel gas tank, unaffected by the environment. It has passed national-type tests and is widely used in various secondary power transmission and distribution scenarios to meet the flexible use needs of compact switchgear. It implements multiple national standards such as GB/T 3804-2017.
1. Rated voltage: 12/24kV;
2. Rated frequency: 50Hz;
3. Rated current: 630A (load switch unit/circuit breaker unit), 125A (combination electrical unit, depending on fuse current);
4. Rated short-time withstand current: 25kA/4s;
5. Rated peak withstand current: 63kA;
6. Rated short-circuit breaking current:25/25kA (circuit breaker unit);
7. 1min power frequency withstand voltage: phase-to-phase/phase-to-ground 42/65kV, breakpoint 48/79kV;
8. Lightning impulse withstand voltage: 75/125kV;
9. Filling gas: SF6/C4 mixed gas, C4 gas inflation pressure (20℃) 0.02MPa;
10. Annual gas leakage rate: 0.01%;
11. Mechanical life: load switch 10,000 times, circuit breaker 20,000 times;
12. IP protection class: cabinet IP4X, gas tank IP67;
1. Core structure: stainless steel sealed gas tank, spring operating mechanism, insulating bushing, separable connector;
2. Functional units: multiple modules optional such as load switch unit (R), combination electrical unit (T), circuit breaker unit (L);
3. Key components: insulating gas pressure gauge, live display, pressure relief chamber, switch mechanism observation window (optional);
4. Interlocking design: rigid interlocking between circuit breaker and isolating switch/earthing switch, interlocking between earthing switch and cable room door;
5. Expansion method: supporting top or side expansion, standard interface to realize parallel connection of multi-medium ring main units;
1. Small secondary distribution stations, box-type switch stations;
2. Industrial and mining enterprises, airports, railways, commercial areas, high-rise buildings;
3. Expressways, subways, tunnels;
4. Places with harsh natural conditions.
1. Operating environment: altitude ≤4000m, temperature -40℃~+55℃, 24h average humidity ≤95%;
2. Pollution class: not exceeding Class Ⅳ in GB/T 5582;
3. Storage requirements: dry, ventilated and moisture-proof indoor warehouse, protective treatment required for long-term storage;
4. Factory inspection: including assembly, mass spectrometry leak detection, withstand voltage, mechanical characteristics and other tests
