The conductive part of GN19-12/400, 630, 1000, 1250 type disconnect switch is fixed on the base by two pillar insulators for each phase. (GN19-12C/400, 630, 1000, 1250 type has one pillar insulator and one porcelain casing insulator.) The three phases are installed in parallel, and the conductive part consists of static contacts of contact knives and contact holders (or conductive rods). Each phase of the contact knife are connected to the middle of the tie insulator, tie insulator and installed on the base of the spindle connected. The spindle is connected to the connecting rod (user-provided) and CS6-1 type of moving mechanism through the handle. The connecting contact knife is composed of two slotted copper plates, which not only increases the heat dissipation area of the contact knife to lower the bottom temperature, but also improves the mechanical strength of the contact knife, so that the dynamic stability of the switch is improved. One end of the contact knife is mounted on the contact block (or on the conductive rod) by a bolt (car of Shaw). GN19-12/1000, 1250 in contact with the installation of magnetic locking plate, plus the purpose of the magnetic locking plate is that when a large short-circuit current to enhance the two groove contact knife between the| attraction. GN19-12/400, 630 disconnect switches have a small limit through current, so there is no need to add a magnetic locking plate.
1. Isolation and Safety: After disconnection, a reliable insulating gap is established to ensure that the
2. Line Switching: Switch and connect the line according to operational requirements.
3. Low Current Switching: Used for switching small currents in the circuit, such as charging currents of bushings, busbars, connectors, short cables, capacitor currents of switching voltage equalization capacitors, circulating currents during double bus switching, and excitation currents of voltage transformers.
4. Transformer Exciting Current: Depending on the specific circumstances of different structural types, it can switch the no-load excitation current of transformers of certain capacities.
Types of Medium-Voltage Isolators
Medium-voltage isolators can be divided into outdoor and indoor types based on installation methods:
- Outdoor Medium-Voltage Isolators: Capable of withstanding natural factors such as wind, rain, snow, dirt, condensation, ice, and frost, suitable for installation on outdoor platforms.
- Indoor Medium-Voltage Isolators: Suitable for indoor environments, typically requiring higher insulation performance.
Based on the structure of the insulation support, they can be further divided into:
- Single-Column Isolation Switch: Directly use vertical space below the overhead busbar as electrical insulation, saving space, reducing connecting conductors, and providing clear disconnection states, particularly suitable for ultra-high voltage transmission.
- Double-Column Isolation Switch: Suitable for higher current demands, providing greater stability.
- Three-Column Isolation Switch: Suitable for more complex power systems, offering better load capacity and reliability.
1：Safety Isolation Function - During electrical equipment maintenance, it provides a clear electrical gap and disconnection point to ensure the safety of maintenance personnel.
2：Operational Limitations - The isolating switch cannot be operated under load; it should not be used to break or close load currents or short-circuit currents. Isolating switches equipped with an arc-extinguishing chamber can operate under small loads and unloaded lines.
Power-On Operation: First close the isolating switch, then close the circuit breaker or load switch.
Power-Off Operation: First open the circuit breaker or load switch, then open the isolating switch.
When selecting an isolating switch, ensure that its rated voltage, rated current, dynamic stability current, and thermal stability current meet the requirements of the application. The primary role of the isolating switch is to disconnect circuits with no load current, allowing for safe maintenance. Before operating the isolating switch, ensure that the circuit breaker has disconnected the circuit.
The isolating switch does not have a specialized arc-extinguishing device; do not operate it under load or short-circuit conditions to ensure the safety of equipment and personnel.
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Model |
Rated voltage (kV) |
Rated current (A) |
Rated short-time withstand current (kA/4s) |
Rated peak withstand current (kA) |
|
GN19-12/400-12.5 |
12 | 400 | 12.5 | 31.5 |
|
GN19-12/630-20 |
12 | 630 | 20 | 50 |
|
GN19-12/1000-31.5 |
12 | 1000 | 31.5 | 80 |
|
GN19-12/1250-31.5 |
12 | 1250 | 31.5 | 80 |
|
GN19-12C/400-12.5 |
12 | 400 | 12.5 | 31.5 |
|
GN19-12C/630-20 |
12 | 630 | 20 | 50 |
|
GN19-12C/1000-31.5 |
12 | 1000 | 31.5 | 80 |
|
GN19-12C/1250-31.5 |
12 | 1250 | 31.5 | 80 |
1.The upper limit of ambient temperature +40℃, the lower limit -l0℃, Note: Allow storage and transportation at -25℃
2. Altitude not more than 1000m
3. Relative humidity: daily average is not more than 95%, monthly average is not more than 90%
4. Water vapor pressure: the daily average is not more than 2.2 × 10-3Mpa, the monthly average is not more than 1.8 × 10-3Mpa
5. The surrounding air should be free from corrosive or combustible gases, water vapor and other obvious pollution.
6. No regular and violent vibration.
Note: Please consult with the manufacturer to solve the problem if it is not in line with the above conditions
●Accept OEM&ODM:YES
●Certificate: CE,Test reports
●Production time: 7~ 12 working days
●Warranty period: 12 Months
●Delivery time: 15 days
●When ordering this switch, please indicate the model specification, rated voltage, rated current and other technical data.
●If there are special requirements, you can negotiate our to solve them.
Factory
Certificate
Address
No.1083 Zhongshan East Road, Yinzhou District, Ningbo City, Zhejiang Province, China
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