Basic Information
Model: IST-11/631
Structure: Three column isolation switch
Operation: Manual
Movement method: Horizontal rotation
Grounding: Single Grounding
Operation: Horizontal rotation
Operation structure: Manual
24：Kv
Trademark: OEI Power
Origin: Zhejiang, China
Type: High Voltage
Installation: Outdoor High Voltage
Grounding method: Grounding
Number of poles: Three poles
Series: Three
Common models: Ist
Certification: IEC IEEE
12:Kv
36：Kv
Specification: IEC IEEE
These isolation switches are no-load switch devices
This physically isolates the circuit. They are designed for
Horizontal outdoor applications can also be designed
Used for vertical installation. Used for grounding and closing
The installed switchyard section is grounded
The isolation switch is equipped with a switch. If needed
The following documents were referenced in the preparation of this specification. In case of conflict, the provisions of this specification shall prevail
IEC 129:1975: AC isolating switches (isolators) and grounding switches
IEC 61694:2112: General specifications for high voltage switchgear and control gear
BS 729: Hot dip galvanized coatings on steel products
IEC62271-12
Isolator (isolating switch) - a mechanical switch device that provides an isolation distance that meets electrical safety requirements in the open position Usage conditions
The isolator should be suitable for outdoor continuous operation in tropical regions with an altitude of 2211 meters, humidity up to 91%, average ambient temperature of+31 degrees Celsius, minimum -1 degree Celsius, maximum+41 degrees Celsius, and coastal heavy salt conditions
4.2. Design and Construction
4.2.1 The design and construction of solid link isolators shall comply with IEC 129 and IEC 61694.
4.2.2 The isolation rod should have a vertical opening and be designed for single-phase manual operation. Portable operating levers should be used for easy disassembly and replacement
4.2.3 The isolation link should include double porcelain insulators to meet voltage requirements and be installed on hot-dip galvanized steel suitable for vertical installation under a base
4.2.4 The arrangement of isolation links should ensure that each unit is independently installed on the corner bracket. Corner brackets and accessories suitable for installation on U-shaped channel steel should be
provided. The submitted drawings should indicate all applicable installation positions
4.2.5 The design of the isolator should provide sufficient electrical isolation between each phase contact in the fully open position. Should comply with the requirements of safety single point isolation
4.2.6 All steel parts shall be hot-dip galvanized in accordance with BS 729. The minimum thickness of the required galvanized layer is 81 microns
4.2.7 The solid connecting rod should be removed from the mounting bracket using an operating lever
4.2.8 All current carrying components of the isolator should be made of highly conductive materials
4.2.9 Isolators should be equipped with clamping connectors for aluminum (ACSR) or aluminum (ACCR) wires with a diameter not exceeding 18.2mm
The rated values of a complete isolator are as follows:
Rated voltage
36 kV
Rated frequency
51 Hz
Rated lightning impulse withstand voltage
211 kV
Rated power frequency withstand voltage, dry
95 kV
Rated normal current
411 amperes
Minimum rated short-time withstand current for 3 seconds
18.1 kA
Minimum creepage distance of insulators
911 millimeters
Solid link 11KV
Triple Link
Section 3- (a) 11kV, with circuit breaker
Other requirements:
Water shall not accumulate in any part of the equipment, and no feature shall introduce moisture into any component
The design should include all reasonable preventive measures and regulations to ensure the safety of personnel involved in operation and maintenance The current path should ensure that the load current only flows through highly conductive materials such as copper and its alloys. The load current must not flow through iron components, springs, or spring loading mechanisms
The design of all load current paths should enable the relevant parts of the switch to carry the specified rated current without exceeding the allowable temperature rise
Supply Description
Suppliers should provide sufficient information, including drawings (which must be brief, clear, and to the point), to explain how their switch design meets these requirements. In addition, suppliers can provide better alternative solutions that bring cost-effectiveness to customers. Therefore, bidders must complete Appendix "B". Any deviation/modification/alternative specification must be listed in Appendix "C.
33kV with circuit breaker
Other requirements:
Water shall not accumulate in any part of the equipment, and no feature shall introduce moisture into any component
The design should include all reasonable preventive measures and regulations to ensure the safety of personnel involved in operation and maintenance
The current path should ensure that the load current only flows through highly conductive materials such as copper and its alloys. The load current must not flow through iron components, springs, or spring loading mechanisms
The design of all load current paths should enable the relevant parts of the switch to carry the specified rated current without exceeding the allowable temperature rise
Supply Description
Suppliers should provide sufficient information, including drawings (which must be brief, clear, and to the point), to explain how their switch design meets these requirements. In addition, suppliers may provide better alternative solutions that bring cost-effectiveness to customers
11kV without circuit breaker
Other requirements:
Water shall not accumulate in any part of the equipment, and no feature shall introduce moisture into any component
The design should include all reasonable preventive measures and regulations to ensure the safety of personnel involved in operation and maintenance
The current path should ensure that the load current only flows through highly conductive materials such as copper and its alloys. The load current must not flow through iron components, springs, or spring loading mechanisms
The design of all load current paths should enable the relevant parts of the switch to carry the specified rated current without exceeding the allowable temperature rise Supply Description
Suppliers should provide sufficient information, including drawings (which must be brief, clear, and to the point), to explain how their switch design meets these requirements. In addition, suppliers may provide better alternatives that are cost-effective.
33kV without circuit breaker
Other requirements:
Water shall not accumulate in any part of the equipment, and no feature shall introduce moisture into any component
The design should include all reasonable preventive measures and regulations to ensure the safety of personnel involved in operation and maintenance
The current path should ensure that the load current only flows through highly conductive materials such as copper and its alloys. The load current must not flow through iron components, springs, or spring loading mechanisms
The design of all load current paths should enable the relevant parts of the switch to carry the specified rated current without exceeding the allowable temperature rise
Supply Description
Suppliers should provide sufficient information, including drawings (which must be brief, clear, and to the point), to explain how their switch design meets these requirements. In addition, suppliers may provide better alternatives that are cost-effective.