For 40.5kV switchgear projects, selection involves more than confirming the voltage class. The installation structure, phase spacing, withstand requirements, and mounting dimensions also need to match the actual cabinet design. The 40.5kV Indoor Earthing Switch 31.5kA series provides different phase spacing configurations and corresponding dimensions for project selection and replacement work.
40.5kV Indoor Earthing Switch 31.5kA is configured with a 31.5kA/4s rated short-time withstand current and an 80kA rated short-circuit making current. The product documentation also specifies control of copper bar cross-section, contact pressure, and spring stiffness during assembly to support the required thermal and mechanical performance.
The product provides a 95kV power-frequency withstand voltage and a 185kV lightning impulse withstand voltage. The insulation structure uses components specified for the 40.5kV voltage class, including post insulators and insulating pull rods.
The series supports 300mm, 350mm, and 400mm phase spacing configurations. The 300mm configuration requires a phase-to-phase insulating partition, while the final selection should correspond to the busbar arrangement and internal structure of the switchgear.
The main electrical and configuration parameters are listed below for technical selection:
| Parameter | Specification |
| Product Type | Indoor Earthing Switch |
| Product Series | JN22-40.5/31.5 |
| Rated Voltage | 40.5kV |
| Rated Short-Time Withstand Current | 31.5kA / 4s |
| Rated Short-Circuit Making Current | 80kA |
| Rated Peak Withstand Current | 80kA |
| 1min Power-Frequency Withstand Voltage | 95kV |
| Lightning Impulse Withstand Voltage | 185kV |
| Phase Spacing | 300 / 350 / 400mm |
| 300mm Phase Spacing | Phase-to-phase insulating partition required |
Different phase spacing configurations use different mounting dimensions. These dimensions should be checked against the switchgear structure before replacement or installation.
| Model | E (mm) | L (mm) | H (mm) |
| JN22-40.5/31.5-300 | 300 | 1100 | 786 |
| JN22-40.5/31.5-350 | 350 | 1200 | 886 |
| JN22-40.5/31.5-400 | 400 | 1374 | 986 |
40.5kV Indoor Earthing Switch 31.5kA uses 40.5kV-specific insulation components. Its 95kV power-frequency withstand voltage and 185kV lightning impulse withstand voltage correspond to the insulation requirements stated in the product documentation.
The product information notes that a 40.5kV earthing switch has a higher power-frequency withstand requirement than the corresponding 12kV product, where the listed value is 42kV. The insulation structure therefore uses components and distances appropriate to the higher voltage class.
For the 300mm phase spacing configuration, a phase-to-phase insulating partition is required. This structure is used to improve phase-to-phase insulation conditions where the spacing is relatively compact.
The cabinet should therefore have sufficient internal space for the insulating partition when the 300mm configuration is selected.
The assembly process includes control of the coaxiality between insulators and the base, as well as the connection between the conductive crossbeam and insulation components. Insulation components are visually inspected and cleaned before assembly to reduce the effect of surface contamination.
As phase spacing increases, the conductive crossbeam and operating shaft become longer. The assembly process therefore includes control of operating shaft rigidity and transmission precision. Torque wrenches are used to control contact spring compression, followed by opening and closing torque testing.
The documented factory testing process includes:
The 95kV withstand test is used to verify insulation performance, while circuit resistance testing checks the contact condition of the conductive loop.
When selecting the product for a new switchgear project, first confirm the busbar arrangement and required phase spacing. The 300mm, 350mm, and 400mm configurations can then be checked against the cabinet design and required installation dimensions.
40.5kV Indoor Earthing Switch 31.5kA replacement projects require both electrical and mechanical information. The original model, phase spacing, mounting dimensions, and switchgear information should be checked before production.
The recommended information includes:
Different phase spacing configurations have different L and H dimensions, so the replacement model should be confirmed against the actual cabinet structure rather than selected only by voltage rating.
Dongfa Intelligent was founded in 2012 and is located in Yueqing Economic Development Zone, Wenzhou, Zhejiang. The factory covers more than 2,000m² and has 17 employees, 4 technical engineers, 2 production lines, and 1 set of testing equipment.
The documented production capacity is 600-700 units per month and 7,000-8,000 units per year. Products have been exported to Southeast Asia and parts of Europe.
According to the supplied product information, standard products have a lead time of 7-15 working days, while customized products require 15-30 working days. Standard products support a minimum order quantity of 1 unit.
A: The main items include rated voltage, short-time withstand current, short-circuit making current, insulation level, phase spacing, and mounting dimensions. For replacement projects, the original model and switchgear drawings should also be checked.
A: The supplied technical information specifies a phase-to-phase insulating partition for the 300mm configuration. It provides additional phase-to-phase insulation structure where the spacing is relatively compact, so cabinet space for the partition should be confirmed during selection.
A: Yes. The 300mm, 350mm, and 400mm configurations have different E, L, and H dimensions. For example, the JN22-40.5/31.5-300 model has an L dimension of 1100mm, while the JN22-40.5/31.5-400 model has an L dimension of 1374mm.
A: The recommended information includes the original model, phase spacing, mounting dimension drawings, switchgear information, and quantity. Providing the original product documentation can also help with dimensional and configuration checks.
A: The documented tests include circuit resistance testing, mechanical operation testing, power-frequency withstand voltage testing, and vacuum degree inspection. These checks cover the conductive circuit, mechanical operation, and insulation-related conditions.
A: The supplied information states a lead time of 7-15 working days for standard products and 15-30 working days for customized products. Standard products support a minimum order quantity of 1 unit.
A: Dongfa Intelligent was founded in 2012 and operates a factory of more than 2,000m² in Yueqing, Zhejiang. The documented facility has 17 employees, 4 technical engineers, 2 production lines, and 1 set of testing equipment, with a monthly capacity of 600-700 units.
A: Please provide the rated voltage, short-time withstand current requirement, short-circuit making requirement, phase spacing, mounting dimensions, switchgear information, and quantity. For replacement projects, the original model and drawings are recommended.
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