Product Overview:
    ZF28-550 type GIS/ ZH28-550 type HGIS is composed of standard modules through flanged joint, which can meet the demand for substation optimization design through the flexible combination between modules. It saves space and conforms to technical requests.
    This product can be applied to power system, power generation, rail transportation, petrochemical, metallurgy, mining, building materials and other large industrial consumer.

Features and advantages of the product:

• Fully spring mechanism, high reliability.

• Excellent breaking ability.

• The arc extinguish of CB adopts dual break structure, and shunt capacitor to balance the voltage between open contacts, which improves the breaking ability of short-line fault and the breaking current of short circuit is 63kA.

• E2-M2-C2 circuit breaker; E2 electrical endurance; M2 mechanical endurance.

• Strong rated current flow capacity.

• Excellent insulation level, low partial discharge.

• Excellent corrosion resistance.

• Advanced Designing tool.

• Basin-type insolator with aluminium flange; double sealing structure.

• Strict assembly technology.

• The domestic first high power spring operation mechanism of circuit breaker has the small volume and is safe and stable, free of maintenance. high reliable and conform to oil free and gas free requirements for operation mechanism.

•  Interrupter unit adopts shunt capacitor to balance the voltage between open contacts It improves short line  fault breaking capability.

• Excellent insulation level and low partial discharge. The only company in the industry that can achieve: under the 80% power-frequency withstand voltage (80%×740kV = 592kV), the partial discharge of intervals is lower than 5pC, the partial discharge of the insulator is lower than 3pC. It’s better than the IEC standard that the partial discharge should be lower than 5pC under 1.2 times phase voltage (1.2×550/√3 = 381kV).

• The insulator quality is stable and reliable. The basin-type insulator pouring process reaches the international advanced level.

Technical Parameters:

What are the basic requirements for GIS operation?

• Indoor SF6 equipment room that operators often enter: ventilate at least once per shift, ventilate for 15 minutes, the air exchange volume should be greater than 3-5 times the air volume, and the air outlet should be installed in the lower part of the room; Equipment places that are not frequently visited by operators: ventilate for 15 minutes before entering.

• During operation, the induced voltage on the shell and frame of GIS should not exceed 36V for the parts that are easily accessible to operation and maintenance personnel.

• Temperature rise: should not exceed 30K in the part that is easily accessible to operating personnel; The part that is easily accessible to the operator but not touched during operation should not exceed 40K; Individual parts that are not easily accessible to the operator should not exceed 65K.

• SF6 switchgear inspection at least once a day, unattended substation inspection according to regulations. During the inspection, the visual inspection is mainly carried out, and the equipment is not abnormal, and a record is made.