Solid Insulated Core Unit

Operating Condition

a. Altitude: ≤4000m (Please specify the situation when the altitude is higher than 1000m)

b. Ambient temperature: -40~+50℃; average temperature in 24h ≤35℃.

c. Ambient humidity: 24-hour Max. Average relative humidity: 95%; monthly Max. Average relative humidity: 90%

d. Installation condition: no explosive and corrosive gas around; no violent vibration and impact at installation site; pollution level less than GB/T5582 Grade III.

e. Seismic intensity: 9 degrees. 

 Please Specify When Ordering

Altitude: 1000m / above 1000m

Operation mode: manual / electric20kA / 25kA

Rated short circuit breaking current: 20kA / 25kA

Working position: two / threeDC24V / DC48V / DC110V / DC220V

Operating voltage: DC24V / DC48V / DC110V / DC220V

Configuration: circuit breaker / load break switch / disconnector

Secondary wiring： with / without (normally without)

Other requirements

Main Technical Parameters

The data above meet 12kV ring main unit category II earthing system technical specification of SGCC (State Grid Corporation of China), China Southern Power Grid and Jiangsu Electric Power Company, which are totally compatible with different neutral grounding. With GSVR series 12kV cable accessory, three-way cable connection combination and two-way cable with one-way lightning arrester connection combination are possible.

Note: category I: neutral point earthing system via low-resistance;

a.The master switch adopts vacuum interrupter
b.Particular curve design for reducing force mechanism

①Reduce dosing impact

②Reduce extra work

③No extra contact pressure added when trigger returns

④Diffuse the contact pressure and reduce tripping force when opening

Disconnector Design

a. Disconnectors with three-position design prevent incorrect operations thoroughly in theory design

b. Contact design benefits earthing making, and the making speed >4.2m/s

c. High-performance Mubea belleville spring guarantees stability of the contact pressure

Master Switch Mechanism

a. Motor, auxiliary switch, release, travel switch of the master switch mechanism are removable and easy maintenance

b. Two-spring precise transmission design has reclosing function

c. Automatic counting function meets the latest State Grid purchase standard

d. High quality quenched and tempered steel and chilled steel are used in all transmission components

e. Needle bearing design of the core transmission has deep impact-resistance, large loading and little frictional drag

Disconnector Mechanism Design

a. Disconnecting mechanism, with three-position mechanism single spring and two independent operating shafts, thoroughly prevents misoperations according to the theoretical design

b. Disconnecting operation mechanism can add electric configuration

c. Dual clutch design makes the manual operation and electric operation switch freely

d. The output shaft, with the gear acceleration design, has high output efficiency, large power transmission and the earthing making speed>4.2m/s

Inspection Window Design

a. According to the optical imaging principle adopted in the window, the range of observation can be large although the viewing window is small

b. The earthing window with build-in light are easy and clear to observe

c. The illumination with LED guarantees the light life

Pressure-Relief Design

Dedicated pressure-relief device

Operating Button Design

a. Master switch manual operation with button design is easy to operate.

b. The button cover can prevent misuse and can also add a padlock.The planetary reducing direct-current permanent magnet motor, with small size and stable working condition, has amazing transmission efficiency. The loss of energy efficiency is about 3%.

Second Generation Solid Insulated Core Unit

Surface with greyish white zinc coating, completely earthed and touch-proof design.