Introduction to 170kV GIS Products

I.                Product Overview

ž   Totally three - phase common - tank structure

ž   Aluminum alloy enclosure

ž   The circuit breaker is equipped with a full - spring operating mechanism

ž   Three - position isolating earthing switch, achieving mechanical interlock between isolation and earthing

ž   The position isolating earthing switch is equipped with an electric operating mechanism, and the FES is equipped with an electric spring mechanism

ž   Compact structure, small space occupation, whole interval transportation, short on - site installation and commissioning cycle

II.                Product Overview

ž   Product conditions of use

ž   Main technical parameters

ž

III.             Product structure

�?span style="font:9px 'Times New Roman'">   Circuit breaker

�?span style="font:9px 'Times New Roman'">   Current transformer

�?span style="font:9px 'Times New Roman'">   Basin - type insulator

�?span style="font:9px 'Times New Roman'">   Three - position disconnector

�?span style="font:9px 'Times New Roman'">   Circuit breaker operating mechanism

�?span style="font:9px 'Times New Roman'">   Voltage transformer

�?span style="font:9px 'Times New Roman'">   Fast earthing switch

�?span style="font:9px 'Times New Roman'">   Cable termination

�?span style="font:9px 'Times New Roman'">   Control cabinet

                                i.            Circuit breaker

ž   Self - energy arc - extinguishing chamber, with a breaking current of 40 kA.

ž   The circuit breaker is equipped with a CT20 electric spring operating mechanism, featuring an M2 - level mechanical life (10,000 operations).

ž   The mechanism is top - mounted, facilitating installation and maintenance.

ž   The three - phase capacitive current switching capacity reaches the highest C2 level specified in IEC and national standards.

                              ii.            Disconnecting, grounding switches 

ž   The disconnector and earthing switch are integrated.

ž   The isolation and earthing share one moving contact and have three working positions.

ž   Mechanical interlocking between isolation and earthing is achieved.

ž   It is equipped with a dual - motor electric operating mechanism with a mechanical life of 10,000 times.

                             iii.            Quick-earthing switches

ž   Equipped with an electric spring mechanism, with a mechanical life of 10,000 times.

ž   Capable of switching electromagnetic induction inductive current of 80A.

ž   Capable of switching electromagnetic induction inductive voltage of 2kV.

ž   Capable of switching electrostatic induction capacitive current of 3A.

ž   Capable of switching electrostatic induction capacitive voltage of 9kV.

                                iv.            Current transformers

ž   Electromagnetic current transformers are used. Also, according to the requirements of intelligent substations from customers, electronic or photoelectric current transformers can be configured.

ž   An internal - type structure is adopted.

ž   It can meet the requirements of TPY (transient protection) coils.

ž   The terminal box is set at a slant - side position, which is convenient for wiring.

                              v.            Voltage transformers 

ž   Electromagnetic voltage transformers are adopted. Electronic voltage transformers can also be configured according to customers' requirements.

ž   It is divided into single - phase type and three - phase type.

ž   Three layout forms, namely upright, horizontal and inverted, can be realized.

                             vi.            Surge arresters

• Zinc oxide surge arresters are adopted.

• There are two layout forms: top - out type and side - out type.

                                vii.            Terminal elements

ž   The cable termination is of relatively low height, with a small distance from the ground. Using this type of cable termination is suitable for the layout of miniaturized power plants with a small footprint.

                                viii.            SF6 inflatable casing 

ž   Filled with SF6 gas inside.

ž   Porcelain bushing / composite bushing.

ž   Pollution degree: Class c, d, e.

ž   The external insulation meets the operating conditions at an altitude of 1000m.

Composite casing 

porcelain casing

ix.            LCP cabinet

ž   The LCP cabinet is independent of the circuit breaker mechanism cabinet and is not affected by the operation of the CB.

ž   It adopts a front - and - rear - opening door type, which is easy to wire and looks neat and beautiful.

ž   The protection levels are IP54, IP55, IP64, and IP66.

LCP cabinet panel, LCP cabinet front door, LCP cabinet rear door

                                x.            transportation

ž   During transportation, a transportation support is installed at the top of the underframe to increase the contact area of the underframe and ensure the safety of the bay during transportation.

IV.                Technical characteristics

• The product has been verified through strict type tests. All type tests were completed at the CESI Test Station in Italy and the XIHARI Test Station. The product obtained a certificate of conformity and international qualifications.

• The circuit breaker has an M2 - level mechanical life (10,000 mechanical operations), and the isolating/earthing switch also has a mechanical life of 10,000 times. The product can operate stably and reliably for a long time.

• Adopting a compact structure with a fully three - phase common tank, the bay width is 1.5 meters, which is more suitable for the layout of power plants with limited space.

• Using a three - position isolating/earthing switch structure to achieve mechanical interlocking between the isolating switch and the earthing switch, avoiding the misoperation of simultaneous closing of the isolating switch and the earthing switch, thus ensuring high reliability. The transmission elements of the three - position isolating/earthing switch are combined with the moving contact. The contact has a simple structure, and the system uses spring - type contacts, making the operation more reliable and the operation safer.

l  Metal - ring basin - type insulators are used to avoid direct mechanical stress on the insulating parts, prevent the aging of insulating materials, improve the ability to resist external interference and the reliability of the grounding system, and make the product more aesthetically pleasing (no need for jumper grounding wires).

• A large number of cast aluminum alloy shells and covers are used. While optimizing the internal electric field, the overall appearance of the GIS is enhanced. It can also reduce the weight of a single bay and improve the overall anti - corrosion performance of the GIS.

• Standardized production. The design and production of this product are based on mature basic functional components and standard bay units, achieving standardization and modularization in design, production, and installation.