Brief Introduction of 170kV Gas Insulated Metal Enclosed Switchgear (GIS)

I. General

The ZF7-170 kV gas insulated switchgear (GIS) developed and manufactured by XD Group has advanced technical parameters and excellent performance. It has the advantages of high reliability, convenient operation and less maintenance. According to GB and IEC standards, the products have passed a complete set of type tests in XIHARI and CESI test station in Italy, filling in the empty in our country and reaching the international leading level.

II. Service environmental conditions

Installation conditions: indoor or outdoor.

Ambient temperature: -25℃~40�?(corresponding measures can be taken in high and low temperature areas).

Maximum daily temperature difference: 25�?

Seismic intensity: horizontal acceleration is 0.5g; The vertical acceleration is 0.25g.

Pollution grade: grade D and E.

Altitude:  �?,500m (special design can be made at high altitude).

III. Main technical parameters

Rated voltage: 170kV;

Rated current: 4000A;

Rated frequency: 50Hz;

Rated short-time withstand current: 40 kA, 50kA;

Rated peak withstand current: 100 kA, 125kA;

Rated short circuit duration: 3s;

Rated lightning impulse withstand voltage (Phase to earth /across open): 750/750+110kV

Rated 1min power frequency withstand voltage (Phase to earth /across open): 325/325+50kV;

Mechanical life of CB, DS, ES and FES: 10,000 times.

IV. Overall structure of 170kV GIS

170kV GIS three phase in one enclosure, adopt aluminum enclosure, with the bay is light weight, low eddy current loss, low temperature rise, strong corrosion resistance, high reliability and large safety margin; The minimum bay width can reach 1,200mm, with high component compounding degree, compact structure, the whole bay transportation and small floor space.

Circuit breaker (CB)

The circuit breaker is vertical and single-break, and the interrupter adopts self-energy arc-extinguishing/air-compressor structure, which has stable and reliable breaking performance, and the breaking capacity can be as high as 50kA. Each circuit breaker is equipped with a spring operating mechanism, and three-phase mechanical linkage operation. The mechanical life reaches class M2 (10,000 times), and the rated short circuit breaking current can be broken 20 times.

Three-position disconnector-earthing switch (DES)

Disconnector (DS) and earthing switch (ES) are integrated, share a moving contact, and have three working positions to realize mechanical locking of DS and ES; Equipped with electric mechanism, the mechanical life reaches class M2 (10,000 times).

Earthing switch (ES), fast earthing switch (FES)

Earthing switch (ES) and fast earthing switch (FES) can be attached to the disconnector or arranged separately. The earthing switch is equipped with motor operating mechanism, and fast earthing switch is equipped with motor spring operating mechanism, three-phase mechanical linkage, the mechanical life has reached class M2 (10,000 times).

V. Product advantages

GIS has excellent performance and high technical parameters.

1. High through-current capacity, rated current of 4,000A; Mechanical operation is stable and reliable; The mechanical life of circuit breakers, disconnectors, earthing switches and quick earthing switches has reached class M2 (10,000 times).

2. Strong breaking current capacity, rated short-time withstand current of 40kA, 50kA (three-phase is breaking at the same), and the three-phase capacitive current switching capacity reaches the highest level C2 in IEC and national standards.

3. High insulation reliability. Under the test voltage of 1.2×170/�?kV (which is better than the 1.1×170/�? kV required by the national standard), the partial discharge of the whole bay is not more than 5pC, and the partial discharge of a single insulator is not more than 3pC.

4. Three phase in one enclosure with aluminum enclosure, the bay is light weight, low eddy current loss, low temperature rise and strong anti-corrosion ability.

Independent R&D design, strong integration ability, safe and reliable operation.

1. It has completely independent intellectual property rights, and the core components of products and their processing and manufacturing are produced in the Switchgear Business Departments and integrated; the industry's advanced simulation and calculation design software such as Maxwell 3D, ANSYS, UG are used for dynamic simulation, analysis, three-dimensional design, visual assembly and installation, so that the design and production information can be transmitted quickly and accurately.

2. The control cabinet (LCP cabinet) is organically integrated with the body, adopting an integral underframe, which can be transported at whole bays, and the on-site installation and commissioning cycle is short.

3. Intelligent components such as integrated electronic transformer, GIS status online monitoring (partial discharge, circuit breaker, SF6 gas), closing selector and switch controller can be selected.

4. Strict and perfect quality process control, delivery and service system to ensure reliable manufacturing quality and after-sales have nothing to worry about.

Good environmental adaptability.

1. When the environmental temperature of the project site is lower than -25�?/span>and -32.5�?/span>, thermal insulation measures can be taken to prevent SF6 gas liquefaction to ensure the reliable operation of the product.

2. LCP cabinet and mechanism cabinet have excellent sealing design, which can be well protected from rain and strong wind and sand environment.

3. The outdoor LCP cabinet can effectively protect the secondary components in the cabinet and ensure the safe and reliable operation of control, alarm, monitoring and other systems by strengthening the design of rainproof, reflecting sunlight, adopting thermal insulation materials and setting automatic monitoring and adjusting devices for high and low temperature/humidity; The protection grade can reach IP66, which can effectively deal with humid, high and low temperature and strong sunshine environment.

VI. Summary

ZF7-170kV gas insulated switchgear (GIS) of our Company has reliable performance, advanced technical parameters, fully meets the requirements of IEC/GB standards, The test items are complete, and can operate safely in various environments and working conditions.