LBHB-12(V)/630-20 Eco-Friendly Gas-Insulated Ring Main Unit

The LBHB-12 series environmentally friendly gas-insulated ring main units (RMUs) are distribution switchgear assemblies that use vacuum interrupters for arc interruption, with an environmentally friendly insulating gas as the primary insulation medium and a small number of solid-insulation support components.

Overview

Environmentally Friendly Vacuum Circuit Breaker: Semi-solid-insulated and fully solid-insulated configurations are available. The switchgear can be configured with an upper disconnector, upper earthing switch, and lower vacuum circuit breaker, or with a lower disconnector, lower earthing switch, and upper vacuum circuit breaker, according to customer requirements, State Grid requirements, project specifications, and local utility requirements.

Service Conditions

Maximum ambient air temperature: +40 °C
Minimum ambient air temperature: −25 °C
24-hour average ambient air temperature: ≤ 35 °C
Relative humidity: Daily average ≤ 95%; monthly average ≤ 90%.
Altitude: ≤ 1,500 m (standard type, at the standard nitrogen filling pressure).
For operation outside the specified service conditions, special requirements shall be agreed upon with the manufacturer.

Technical Parameters

Item	Vacuum Circuit Breaker(VCB)	Disconnector / Earthing Switch
Rated Voltage	12KV	12KV
Power-frequency Withstand Voltage	42/48KV	42/48KV
Lightning Impulse Withstand Voltage (BIL)	75/85KV	75/85KV
Rated Current	630A	630A
Rated Short-circuit Making Current	63	53
Rated Short-time Withstand Current	25	25
Rated Short-time Duration	4S	4S
Mechanical Endurance	10000	3000
Gas Pressure	0.025(20℃)
Annual Leakage Rate	<0.05%
Interruption Medium	Vacuum
Degree of Protection	IP67(Gas Tank)/IP3X(Enclosure)