HV disconnect switch wholesale 10kv 11kv 15kv

Overview

The HV disconnect switch mainly plays a safety role in the power grid.Its task is to open and close circuits under no load to achieve the purpose of power outage maintenance and circuit conversion.

In the closed state, the HV disconnect switch  can reliably pass the rated current and carry the short-circuit current;

in the open state, it forms a clearly visible isolation fracture with reliable insulation, so that the lines that need to be repaired or segmented are isolated from the live lines.

Ensure the safety of maintenance personnel and line equipment.

Since the high voltage isolating switch does not have a special arc extinguishing device, it usually only opens and closes lines when there is no load.But when some special use cases, such as switching buses, switching off no-load transformers and no-load buses, etc., it should also be able to separate and combine the bus conversion current (circulating current), the excitation current of the no-load transformer, and the capacitive current of the no-load bus, etc.

Each phase of the HV disconnect switch structure consists of a chassis, a pillar insulator, a blade, contacts and other parts.

There are screws on the side of the blade to adjust the contact pressure and a spring for compression. The upper end is equipped with a fixed pull buckle and a self-locking device connected to it, which is used for opening and closing of the insulated hook rod.

The product has the advantages of large contact area, low contact resistance, good electrical conductivity and high mechanical strength.

Product implementation standards IEC62271-102, IEC60071-2, IEC60694.

 

Structure of HV disconnect switch

1、Main conductive part

Including: dynamic and static contacts, terminal board, self-locking device, blade,spring, limiter, etc.

2、Insulation part

Mainly refers to insulators

3、Base part

Contains: channel steel seat

4、Nameplates, anti-counterfeiting labels, etc.

5、Install accessories

Includes: installation angle steel, installation bolts, etc.

Selling points

1、Operating mechanism

Brand new operating mechanism refusal to refurbish

 

2、porcelain insulator

Good insulation high-quality insulator casting Durable

anti-fouling,no cleaning

 

3、Plastic spray bracket

Hot-dip galvanizing process with plastic，spraying on the

outer layer Not easy to rust support isolation switch

 

4、Good conductivity

The conductive parts of the wiring are silver plated and have

good adhesion Conductivity.

 

 

Operation of HV disconnect switch

HV disconnect switches, or isolation switches, are designed to isolate parts of an electrical circuit by interrupting the flow of electrical current. Unlike circuit breakers, which are meant to protect circuits from overload, HV disconnect switch is operated manually or remotely to ensure safety during maintenance or inspection.

Their operation is straightforward yet critical; by physically separating contacts within the switch, they create an air gap that ensures no current can flow through the circuit being serviced.

The design of these switches varies depending on their application but typically includes rotating, sliding, or swinging mechanisms to open or close the electrical circuit.

They must withstand the high voltages they control, often involving sophisticated insulation and arc suppression technologies to manage the electrical discharges that occur during operation.

Normal Operating Conditions

1、Ambient temperature: -40℃ ~+40℃ ;

2、Relative humidity: the daily average value is not biggerthan 95%, and the monthly average value is not bigger than 90%;

3、Installation location: the altitude does not exceed 1000m;

4、Wind speed: no more than 35m/s;

5、Ice coating thickness: no more than 10mm;

6、Installation location: There should be no risk of fire,explosion, chemical corrosion and severe vibration;

7、Earthquake intensity: no more than magnitude 8;

8、Not suitable for places with burning or explosion hazards,places with severe vibration or impact, conductive and chemical gas and areas with severe pollution and salt spray.

Ordering instruction

1、tem No；

2、Rated Voltage;

3、Rated Current;

4、Whether with arc extinguishing chamber;

5、Whether with mounting bracket ;

6、Please inform us with your special requirements.

What Are the Main Functions of a High Voltage Disconnect Switch?

A High Voltage Disconnect Switch is primarily designed to reliably break the circuit in a high-voltage power system, ensuring the safe operation and maintenance of the system.

The main function of a high voltage disconnect switch is to provide electrical isolation. During regular maintenance or unexpected failures in the power system, the disconnect switch can completely isolate the equipment that needs servicing from the live parts. This ensures that workers can safely perform maintenance without the risk of electric shock.

This function is particularly important in places like substations and power transmission networks, where it creates a safe, non-electrified working environment for system operators and helps prevent accidents.

Unlike circuit breakers, the mechanical structure of a high voltage disconnect switch is very straightforward. When the switch is open, the disconnection point is clearly visible. This visual design makes it easy for operators to confirm whether the switch is in the open position, greatly reducing the risk of errors. This clear physical isolation ensures that equipment can be safely inspected and maintained when it is powered down.

High voltage disconnect switches are built to function reliably in high-voltage systems, capable of handling heavy voltage and current loads for extended periods. Even under harsh conditions (such as high humidity or extreme temperatures), the switch remains effective in ensuring the system continues to operate smoothly.

It is important to note that high voltage disconnect switches should never be operated under load. In other words, the switch should not be used to break a circuit when the system is still live, as this could lead to serious safety risks.

Key Technical Specifications of a High Voltage Disconnect Switch

1.Rated Voltage: The rated voltage refers to the maximum voltage a high voltage disconnect switch can handle under normal operating conditions. It is one of the most important factors to consider when choosing a high voltage disconnect switch.

2.Rated Current: This indicates the maximum current the switch can continuously handle during operation. It reflects the switch’s capacity to manage load, ensuring that the device can operate stably for extended periods without overheating or malfunctioning.

3.Rated Short-Time Withstand Current: This specification shows the switch’s ability to endure high current levels during a short-circuit or fault situation. Short-circuit currents are usually much higher than normal operating currents, and the disconnect switch must withstand these peaks for a few seconds without sustaining permanent damage.

4.Rated Peak Withstand Current: This measures the highest peak current the switch can handle during the instant a short-circuit occurs. Short-circuit currents can spike rapidly, especially at the moment the fault begins, and this rating shows the switch’s ability to manage these high, short-term surges.

5.Operating Environment: Since high voltage disconnect switches are often installed outdoors, they need to withstand harsh environmental conditions, including extreme temperatures, humidity, strong winds, and heavy rain. This factor should be considered when selecting a switch to ensure it will perform reliably in the specific environment where it will be used.

These specifications ensure the high voltage disconnect switch can operate safely and effectively in various power systems and environmental conditions.

How Does a High Voltage Disconnect Switch Ensure Safety During Maintenance?

One of the key functions of a high voltage disconnect switch is to provide clear electrical isolation. When a power system requires maintenance or repair, operators can use the disconnect switch to completely separate the electrical equipment from the high-voltage parts of the system. Once the disconnect switch is in the “open” position, there is no current flowing in the circuit, and the disconnection point is physically visible. This provides maintenance personnel with a clear visual signal, ensuring that the work area is fully de-energized.

This visible break design allows operators to easily verify that the switch is in the open position, greatly reducing the risk of human error or accidental re-energizing of the equipment. By offering such clear isolation, the high voltage disconnect switch effectively prevents accidental electric shocks caused by mistakes, ensuring the safety of workers during maintenance.

What Types of Power Systems Are High Voltage Disconnect Switches Suitable For?

High voltage disconnect switches are widely used in almost all transmission lines and various types of power systems. As China’s power industry rapidly develops and the electric grid continues to expand, the demand for high voltage disconnect switches has also been increasing.

These switches play a crucial role in power transmission networks, providing reliable isolation when needed. When a fault occurs on a power line, the high voltage disconnect switch creates a clearly visible break point, allowing maintenance personnel to easily confirm that the circuit is safely de-energized. This feature ensures the safety of workers during repairs or maintenance.

With their reliable isolation capability, high voltage disconnect switches are essential in various types of electric grids, substations, transmission lines, and distribution systems, ensuring operational safety and stability in both routine operations and emergency situations.