Product Introduction
Reliable Isolation of Medium Voltage Power Distribution
A stable power distribution system depends on reliable switching equipment and clear electrical isolation.Kechang vacuum isolation switches are designed for medium voltage power distribution applications to help operators isolate circuits during inspection, maintenance, and equipment replacement.It can be integrated into compatible switchgear and substation systems to support safe operation and efficient maintenance.
Vacuum isolation switches are suitable for distribution networks, industrial facilities, commercial buildings and infrastructure projects, and can be configured according to project voltage, rated current, installation space and operating requirements.Its compact structure and practical operating design make it suitable for new installation and switchgear renovation projects.
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Product Advantages
The contact system and insulation structure are important components of the isolation switch. During normal operation, the contacts must carry the specified current without overheating, and the insulating components must be able to withstand the electrical stress associated with the rated voltage.
Kechang vacuum isolation switch can be equipped with suitable conductive contacts, insulating brackets and operating mechanisms according to the requirements of the selected model.For designs using vacuum circuit breakers, the vacuum chamber can provide the environment required for its expected switching function.
It is essential to distinguish between isolation switches and vacuum circuit breakers. Standard isolation switches are used to establish isolation gaps and are usually not used to cut off loads or short circuit currents. These tasks must be completed by specially designed and rated equipment. Therefore, before the equipment is put into use, the complete switch configuration should be confirmed.
Practical Mechanical Designz
The operating mechanism will affect the performance of the switch and daily maintenance. A well-designed mechanism helps to maintain the consistency of opening and closing actions and reduces the risk of problems caused by loose connections or component wear.
Depending on the model, manual or electric operating mechanisms can be provided. The choice depends on the installation layout, frequency of operation, and whether remote operation is required. The mechanical and electrical interlocking devices can also be configured according to the relevant circuit breakers and grounding switches.
Regular inspections are still essential. The operator should check the mechanism, contact condition, insulating surface and interlocking assembly in accordance with the manufacturer's instructions. The actual maintenance cycle depends on the product design and on-site conditions.
Interlocking ensures safer operation
Incorrect switching sequence can cause serious risks during electrical maintenance. Therefore, the isolation switch should be operated in coordination with other switchgear in the switchboard.
Appropriate interlocking devices help prevent incompatible operations, such as operating a ground switch while the relevant circuit is still charged. The specific interlocking device depends on the design of the switchgear and the operating procedures of the installation specification.
Before starting maintenance, the circuit must be isolated and an approved procedure must be used to verify that there is no voltage. The interlocking device is an additional safety measure and cannot replace the correct electrical safety operating procedures.
Applicable to Different on-site Conditions
Medium voltage equipment is installed in a variety of environments, from indoor electrical rooms to outdoor substations. Temperature, humidity, dust, altitude and shell protection will all affect the choice of equipment.
Kechang will consider these conditions when formulating a vacuum isolation switch solution. According to the model, you can choose the appropriate installation method, insulation components, housing and connection structure to meet the project needs. For places with high humidity or high air pollutants, the required protective measures should be confirmed during the technical review period.
The rated environmental limits should always be checked with the product data sheet. This is particularly important for outdoor installations and projects located at high altitudes.
Rating and project configuration
Kechang provides technical selection support for medium voltage vacuum isolation switches used in power distribution and industrial applications. The available configurations depend on the product family and should be confirmed according to the required specifications.
1. Rated voltage: 6 kV to 35 kV, depending on model availability
2. Rated current: 630 A to 3150 A, depending on model availability
3. Operation method: manual or electric operation (if any)
4. Installation method: choose according to the structure of the switchgear
5. Documents: applicable technical drawings and inspection documents
One-stop Vacuum Disconnector Supplier in China
Send your inquiry about vacuum disconnectors to us and get reliable medium-voltage isolation solutions for your power projects. With our robust electrical switchgear components, you can secure circuit isolation, enhance operational safety, and unlock new opportunities for your power distribution and substation projects.
Product Specifications
| Number | Parameter name | Unit | Technical Parameters | |||
| 1 | Rated voltage | kV | 12 | |||
| 2 | Rated short-time frequency withstand voltage (1 min) | kV | 42 | |||
| 3 | Rated lightning impulse withstand voltage (peak) | kV | 75 | |||
| 4 | Rated frequency | Hz | 50 | |||
| 5 | Rated current | A | 630/1250/1600/2000/2500/3150/4000 | |||
| 6 | Rated short-circuit breaking current | kA | 20 | 25 | 31.5 | 40 |
| 7 | Rated short-time withstand current | kA | 20 | 25 | 31.5 | 40 |
| 8 | Rated short circuit duration | S | 4 | |||
| 9 | Rated short-circuit closing current | kA | 50 | 63 | 80 | 100 |
| 10 | Rated peak withstand current | kA | 50 | 63 | 80 | 100 |
| 11 | Number of rated short-circuit current starts | times | 30 | 30 | 30 | 20 |
| 12 | Rated individual capacitor bank opening current | A | ≤630 | |||
| 13 | Rated back-to-back capacitor bank opening current | A | ≤400 | |||
| 14 | Rated capacitor bank closing inrush current | kA | 12.5(frequency≤1000Hz) | |||
| 15 | Closing time | ms | ≤80 | |||
| 16 | Split time | ms | Maximum Voltage | ≤40 | ||
| ms | Rated Voltage | ≤50 | ||||
| ms | Minimum Voltage | ≤60 | ||||
| 17 | Time of ignition | ms | ≤15 | |||
| 18 | Mechanical life (M2) | times | 30000 | |||
| 19 | Allowable cumulative thickness of dynamic and static contact wear | mm | 3 | |||
| 20 | Rated closing operating voltage | V | AC/DC 220, AC/DC 110 | |||
| 21 | Rated breaking operating voltage | V | AC/DC 220, AC/DC 110 | |||
| 22 | Rated operating voltage of energy storage motor | V | AC/DC 220, AC/DC 110 | |||
| 23 | Rated power of energy storage motor | W | 80 (40KA Motor speed 100W) | |||
| 24 | Energy storage time | s | ≤15 | |||
| 25 | Contact opening distance | mm | 9±1 | |||
| 26 | Over traveling distance | mm | 3.5±0.5 | |||
| 27 | Contact closing bounce time | ms | ≤2 | |||
| 28 | Three-phase switching and closing non-synchronous | ms | ≤2 | |||
| 29 | Contact splitting rebound amplitude | mm | ≤3 | |||
| 30 | Contact closing contact pressure | kA | 20 | 25 | 31.5 | 40 |
| N±8% | 2200 | 2500 | 3100 | 4750 | ||
| 31 | Average breaking speed (contacts separated by 6mm) | m/s | 1.1±0.2 | |||
| 32 | Average closing speed (6mm contact closure) | m/s | 0.6±0.2 | |||
| 33 | Dominant electric circuit resistance | A | 630 | 1250 | 1600-2000 | ≥2500 |
| 34 | μΩ | ≤50 | ≤45 | ≤35 | ≤25 | |
| Rated operating sequence (1) 20~31.5KA | Minutes - 0.3s - combined minutes - 180s - combined minutes | |||||
| 35 | Rated sequence of operation (2) 40KA | Minutes - 0.3s - combined minutes - 180s - combined minutes | ||||
| Secondary circuit frequency withstand voltage (1min) | V | 2000 | ||||
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