Huanghua Group Co., Ltd. 
HEI-12 Eco-friendly Gas Insulated Ring Main Unit
Product Overview
HEI-12 Eco-friendly Gas Insulated Ring Main Unit is a high-quality product provided by our company,based on years of experience in distribution field and design and construction.
This equipment absorbs advanced domestic and foreign technologiesand design concepts. The environmental friendly gas-insulatedswitchgear is developed for the major of urban and rural power gridusers. It features reasonable design, reliable power supply, compactstructure, easy installation, flexible operation, small size, and highcostperformance.
Type Designation
The Standard
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IEC 62271-100: High-voltage alternating-current circuit-breakers
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IEC 62271-102: High-voltage alternating-current disconnectors and earthing switches
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IEC 62271-103: Alternating current switches
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IEC 62271-200: Alternating-current metal-enclosed switchgear and controlgear
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IEC 60529: Degrees of protection provided by enclosures (IP Code)
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IEC 62271-1:Common specifications for alternating current switchgear and controlgear
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IEC 60060-1: High-voltage test techniques – Part 1: General definitions and test requirements
Conditions and Scope of use
1.Ambient Condition
Normal Working Condition
The highest temperature of the surrounding air shall not exceed 40°C, and the average temperature measured within 24H is not
more than 35°C, and the minimum is not less than -25°C;
The altitude shall not exceed 1000m;
Relative humidity: daily average shall not exceed 95% and monthly average shall not exceed 90%.
Water vapor pressure: daily average does not exceed 2.2 kPa, and monthly average does not exceed 1.skPa.
The surrounding air is not significantly exposed to dust, smoke, corrosive combustible gases, steam or salt mist.
The amplitude of the induced electromagnetic interference in the secondary system does not exceed 1.okv.
2.Special Working Condition
1 When the ring main unit is installed in the area with an altitude of 100om, the ordering party shall negotiate the factory conditions with the manufacturer and ask for the relevant test reports;
2 When the maximum ambient temperature exceeds 40 °C, the rated current carrying capacity of the ring main unit must be reconfirmed by the manufacturer when ordering.
3.Scope of Use
HEI-12 type ring main unitis used in 12kV power systems for the segmentation, connection, and branch load of cable lines and cable-to-overhead lines
Main Technical Parameter
| Item | Unit | Data | ||
| C unit | V unit | |||
| Rated voltage | kV | 12 | ||
| Rated frequency | Hz | 50 | ||
| Rated current | A | 630 | 630 | |
| Rated short-circuit breaking current | kA | 20 | ||
| Rated short-circuit making current | A | 50 | 50 | |
| Rated earth fault breaking current | A | 30 | ||
| Rated short-time withstand current | Main circuit(4S) | kA | 20 | |
| Earth switch and earth circuit(2S) | 20 | |||
| Earth circuit(2s) | 17.3 | 17.3 | ||
| Rated peak withstand current | Main circuit | kA | 50 | |
| Earth switch and earth circuit | 50 | |||
| Earth circuit | 43.3 | 43.3 | ||
| Insulation test (break,to earth) | 1min, power frequency withstand voltage (break/earth) | kV | 48/42 | |
| Lightning impulse (break/earth) (peak) | 85/75 | |||
| Main circuit resistance | μΩ | ≤ 140 | ≤ 140 | |
| Mechanical life | Times | 10000 | 10000 | |
| Working air pressure | MP | 0.02 | 0.02 | |
| Protection level: Enclosure/Gas tank | IP4X/IP67 | |||
| Overall dimensions (Width x Depth ×Height) | mm | 420×850×1950 | ||
Structure and Feature
Compared to commonly used ring main units, the HEI- 12 ring main unit is designed with upper and lower disconnect switches,an earthing switch. It features intuitive status indication,simple operation (electric), easy maintenance, and safe and reliable operation.
1. Instrument Compartment 2. Mechanism Compartment 3. Circuit Breaker Mechanism 4. Isolator Mechanism 5. CableCompartment 6. Pressure Relief Compartment 7. Gas Tank 8. Isolator 9. Circuit Breaker Switch
