Dongfa Intelligent manufactures outdoor high-voltage disconnectors for distribution systems where electrical isolation is required. The product range covers several voltage classes and current ratings, allowing the equipment to be matched with different outdoor distribution conditions. Compared with an indoor installation, outdoor equipment also needs to account for exposure to rain, dust, temperature changes, pollution, and other site conditions during product selection.
The 12kV Outdoor High Voltage Disconnect Switch provides an isolation point for the relevant circuit section and is used together with circuit breakers and other protection equipment in the complete distribution system. It is not intended to interrupt normal load current or short-circuit current.
| Parameter | 12kV Configuration | 17.5kV Configuration | 24kV Configuration |
| Rated Voltage | 10kV | 15kV | 20kV |
| Rated Working Voltage | 12kV | 17.5kV | 24kV |
| Rated Frequency | 50Hz | 50Hz | 50Hz |
| Rated Current Options | 200A / 400A / 630A / 1250A | 400A / 630A | 400A / 630A |
| 4s Short-Time Withstand Current | 6.3 / 12.5 / 20 / 31.5kA | 16 / 20kA | 16 / 20kA |
| Rated Peak Withstand Current | 16 / 31.5 / 50 / 80kA | 40 / 50kA | 40 / 50kA |
| Power-Frequency Withstand (Earth/Gap) | 42kV / 48kV | 55kV / 65kV | 65kV / 79kV |
| Lightning Impulse Withstand (Earth/Gap) | 75kV / 85kV | 105kV / 120kV | 125kV / 145kV |
| Mechanical Life | 2,000 operations | 2,000 operations | 2,000 operations |
The insulation configuration should be selected according to the working voltage and the electrical conditions of the installation. The supplied technical data provides different power-frequency and lightning impulse withstand levels for the three voltage classes.
The 12kV version has a power-frequency withstand voltage of 42kV / 48kV for earth and gap, respectively, and a lightning impulse withstand voltage of 75kV / 85kV.
The 17.5kV version provides 55kV / 65kV power-frequency withstand voltage and 105kV / 120kV lightning impulse withstand voltage for earth and gap.
The 24kV version provides 65kV / 79kV power-frequency withstand voltage and 125kV / 145kV lightning impulse withstand voltage for earth and gap.
Rated current should correspond with the continuous operating requirements of the circuit, while short-time withstand current needs to be checked against the calculated fault level of the installation.
For the 12kV configuration, available rated currents include 200A, 400A, 630A, and 1250A. The 17.5kV and 24kV configurations listed in the technical data are available in 400A and 630A.
The 12kV configuration provides 6.3kA, 12.5kA, 20kA, and 31.5kA short-time withstand current for 4 seconds. The corresponding 17.5kV and 24kV options are 16kA and 20kA.
Outdoor electrical equipment is directly exposed to the surrounding environment, so site conditions should be included in the technical selection rather than considered only after installation.
Dust and surface contamination can affect the insulation conditions of outdoor equipment. Projects located in dusty, industrial, or highly polluted areas should confirm the required creepage distance and insulation arrangement according to the applicable technical requirements.
Outdoor installations may experience significant temperature and humidity variations. The local climate should be considered when confirming the equipment configuration, installation arrangement, and maintenance requirements.
For coastal locations or other environments with salt exposure, environmental conditions should be provided during technical selection so that the applicable outdoor configuration can be confirmed.
Installation conditions can vary between outdoor distribution projects. The mounting method, available space, conductor arrangement, operating mechanism position, and connection dimensions should therefore be confirmed before production.
Depending on the project design, installation may involve outdoor brackets, pole-mounted arrangements, or integration with other distribution equipment. Special mounting requirements should be supported by drawings or dimensional information.
When specifying the 12kV Outdoor High Voltage Disconnect Switch, the following information should be confirmed in sequence:
The 12kV Outdoor High Voltage Disconnect Switch series can be applied to outdoor medium-voltage distribution systems where a dedicated isolation function is required.
Typical applications include:
The applicable voltage class, current rating, insulation level, and installation arrangement should be confirmed according to the specific project.
Replacing an existing outdoor disconnector requires more than checking the rated current. The original model, system voltage, mounting arrangement, electrical ratings, and installation dimensions should all be compared with the replacement configuration.
For an existing installation, customers can provide the original nameplate, model information, technical drawings, mounting dimensions, system voltage, rated current, short-time withstand current, and quantity.
If original drawings are unavailable, clear equipment photographs together with measured mounting dimensions can be used as preliminary reference information.
Before installing or operating the equipment, the electrical parameters, installation arrangement, and environmental conditions should be checked against the confirmed product configuration.
Verify the system voltage, rated current, short-time withstand current, and applicable insulation levels before commissioning. The selected equipment should correspond with the electrical design of the complete distribution system.
Confirm the mounting position, conductor connections, phase arrangement, and operating mechanism before operation. Incorrect installation may affect mechanical movement or electrical clearances.
During maintenance, inspect the insulators and exposed components for dust accumulation, contamination, corrosion, cracks, or other visible damage. Cleaning and inspection intervals should be determined according to the site environment and equipment maintenance requirements.
The disconnector is intended for electrical isolation. It should not be used to interrupt normal load current or short-circuit current unless the specific product configuration is expressly designed and approved for such operation.
Installation, commissioning, operation, and maintenance should be performed by qualified personnel according to the applicable electrical safety procedures and the operating requirements of the complete distribution system.
Dongfa Intelligent has developed high-voltage electrical products since 2012, with a product range covering 12kV, 24kV, and 40.5kV applications. For the 12kV Outdoor High Voltage Disconnect Switch series, technical coordination can cover voltage selection, current rating, insulation requirements, installation conditions, and project-specific dimensions.
For projects involving replacement equipment or non-standard requirements, technical drawings, electrical specifications, and site information can be reviewed before the final configuration is confirmed.
Rather than using the same configuration for every project, Dongfa Intelligent evaluates high-voltage equipment according to the electrical and installation information provided for each application. This is particularly relevant for outdoor distribution projects where voltage class, current rating, mounting method, and environmental conditions can vary between sites.
The company operates in Yueqing Economic Development Zone, Wenzhou, Zhejiang, with more than 2,000m² of factory space, 17 employees, 4 technical and R&D personnel, and 2 production lines. Its management systems include ISO 9001, ISO 14001, and ISO 45001.
Dongfa Intelligent has supplied high-voltage electrical products to Southeast Asia and parts of Europe. Its product range also includes indoor vacuum circuit breakers, load switches, disconnect switches, and other high-voltage electrical components for distribution applications.
| Item | Information |
| Manufacturer | Zhejiang Dongfa Intelligent Electrical Technology Co., Ltd. |
| Founded | 2012 |
| Factory Area | More than 2,000m² |
| Technical and R&D Personnel | 4 |
| Production Lines | 2 |
| Testing Equipment | 1 set |
| Monthly Capacity | Approximately 600–700 units |
| Annual Capacity | Approximately 7,000–8,000 units |
| Standard Lead Time | 7–15 working days |
| Customized Lead Time | 15–30 working days |
The technical data covers 12kV, 17.5kV, and 24kV working voltage configurations.
The 12kV Outdoor High Voltage Disconnect Switch provides 200A, 400A, 630A, and 1250A options. The listed 17.5kV and 24kV configurations provide 400A and 630A.
The selection should be based on the calculated short-circuit level of the distribution system. The available 12kV options are 6.3kA, 12.5kA, 20kA, and 31.5kA for 4 seconds, while the 17.5kV and 24kV configurations provide 16kA and 20kA.
The insulation levels vary by voltage class. The 12kV, 17.5kV, and 24kV configurations provide different power-frequency and lightning impulse withstand values as listed in the technical specification table.
Outdoor environmental conditions should be provided during product selection. Pollution level, dust, humidity, and salt exposure may affect the required insulation and maintenance considerations.
Please provide the original model, system voltage, rated current, short-time withstand current, installation method, mounting dimensions, technical drawings if available, and quantity.
The supplied technical data specifies a mechanical life of 2,000 operations for the 12kV, 17.5kV, and 24kV configurations.
Address
No. 281, Wei 18th Road, Yueqing Economic Development Zone, Yueqing, Wenzhou, Zhejiang, China
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