Reliable SF6 Switchgear Supplier and Manufacturer in China

KDM SF6 Switchgear

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Sf6 Switchgear: The Ultimate FAQ Guide

Without an advanced knowledge on Sf6 Switchgears, you may not be able to get one that serves the intended purpose.

However, with this guide, you’re going to become an expert in the Sf6 Switchgear.

This guide covers both basic and advanced concepts on this switchgear.

What is Sf6 Switchgear?

A Sf6 Switchgear is a type of switchgear that uses a special gas, Sf6, as its main insulation material.

It is basically an example of gas insulated switchgear.

Sf6 Switchgear

What are the Benefits of Sf6 Switchgear?

The benefits of SF6 switchgear include:

Low Maintenance Cost.

The general maintenance cost of using an Sf6 Switchgear is less since there are fewer blackouts.

Also, the non-reaction with the switchgear components ensures that they are durable, reducing the overall cost.

Minimizes on Space

An Sf6 Switchgear utilizes less space when you compare to Air Insulated Switchgear.

Sf6 Switchgear uses 10% of the space that Air Insulated Switchgear uses.

You can, therefore, use this switchgear in areas with less space.

Environmentally Safe

The use of Sf6 gas minimizes environmental pollution since it does not react with the environment.

Also, the gas is non-react with the switchgear materials preventing any negative effect such reactions can have on the environment.

Reliable

Sf6 Switchgear offers a reliable option than Air Insulated Switchgear.

You expect fewer outages when using Gas Insulated Switchgear.

Also, the rate of maintenance is very low, which means there is less switching off of the switchgear for maintenance purposes.

Easy to Assemble

An Sf6 Switchgear is easy to assemble at the shop.

Also, there is the customization of the modules which facilitate the assembling process.

Are there Disadvantages of Sf6 Switchgear?

Yes. There are disadvantages to using Sf6 switchgear.

They include:

Frequent Flashovers

A decrease in the pressure of the SF6 gas in any compartment of the Switchgear results in flashovers.

There is a need for frequent monitoring of the pressure level to ensure it does not drop.

High Initial Cost

The initial cost of purchasing an Sf6 Switchgear is relatively higher when you compare to purchasing Air Insulated Switchgear.

Requires Maximum Care

Dust contamination of live parts of Sf6 Switchgear is easy, which affects its performance.

There is, therefore, a need for maximum care to prevent dust contamination, which can be tedious.

High Outage Time

It takes a lot of time to identify ad diagnose a fault when it occurs.

This results in high power outages, which affect the plant operation.

Where can you use Sf6 Switchgear?

You can use Sf6 switchgear in the following areas:

1. Environmentally Sensitive Installation

The characteristics of Sf6 Switchgear makes it an ideal option for environmentally sensitive installation.

This is because they can be enclosed, and they are resistant to lightning since the materials belong to Faraday Cage.

2. Urban Installations

You can use Sf6 Switchgear in areas where there is an appeal for real estate and price a critical component.

3. High Voltage Installation

An Sf6 Switchgear is common in common in applications that require high voltage since it utilizes a smaller space.

4. Underground Stations

They are ideal for use since they allow for a metal enclosure.

What are the Components of Sf6 Switchgear?

The components of Sf6 switchgear include:

· Busbar

A busbar is a metallic bar or strip whose function is to connect voltage equipment to the switchgear.

They carry the current within the switchgear.

They are uninsulated and stiff enough to hang in the balance with support from insulated pillars.

· Current Transformer

The function of a current transformer is to multiply or reduce the electrical current in an Sf6 Switchgear.

It helps in maintaining the current between the primary and secondary circuits of the switchgear.

· Step-down Transformer

They help in the conversion of voltage from high to low, which the switchgear panel can use.

· Earthing Switch

Earthing switch helps in directing excess electrical current in the switchgear to the ground.

This helps in reducing electrical overload and the occurrence of electrical faults.

· Disconnecting Switch/ Isolator

The function of a disconnecting switch in an Sf6 Switchgear is to interrupt small currents which are capacitively coupled or induced.

They are a crucial part, especially during maintenance of the Sf6Switchgear.

· Air Break Switches.

They help in the sustenance of two lines or equipment of the switchgear panel, thus minimizing electrocution.

This is through isolation of circuit and equipment within the switchgear.

· Circuit Breaker

A circuit breaker helps in stopping excess current flow in the electric circuit.

This helps in preventing faults from occurring withing the switchgear

It is a metal-clad that uses SF6 gas for fault interruption and Insulation.

How does Sf6 Switchgear Work?

 Sf6 Switchgear

The optimum functioning of the Sf6 switchgear depends on the performance of the individual components.

When a fault occurs, the relay swings into action by closing the circuit trip.

This is through the automatic disconnection of the fault line.

Next, the healthy and operative sections ensure there is a flow of the required normal supply load.

Through this, there is a smooth electrical supply throughout the equipment, ensuring there is no damage.

Overloading of the line inhibits the current from making an electromagnetic release action.

However, it initiates the production of heat by the thermal element.

The heater heats the bi-metal sheet causing it to bend upwards.

This pushes the lever upwards, making the hook to lock off.

This breaks off the primary contact, cutting power supply off.

By doing this, when there is an overload, it exceeds the set current causing the electromagnetic tripper to produce suction.

A combination of the suction and the impact lever results in the lap hook to rotate upwards around the Shaft seat

This results in the release of the lock.

Which features should you look for when Buying Sf6 Switchgear?

You need to check on the following features when buying an Sf6 switchgear

·  Sf6 Switchgear Material

The type of metals used in the manufacturing process determines the application of the switchgear panel.

You, therefore, need to consider the type of metals used in the manufacturing process.

· Safety

The Sf6 switchgear that you purchase should be safe for both the electrical equipment and those who are operating it.

An effective switchgear panel should minimize the occurrence of hazards during operation.

You can check this by going through the specifications and consulting an expert.

· Space

There are different sizes of Sf6 switchgear that utilize different spaces.

Before purchasing one, you should check on the space to ensure that you have enough for your Sf6 switchgear.

Space should allow for maintenance movements of the Sf6 Switchgear.

· Efficiency

The efficiency of your Sf6 switchgear is a critical aspect.

The Sf6 switchgear should be able to operate with minimal interference and maximum output.

This ensures maximum productivity and continuity in your applications.

· Manufacturer’s Reputation

You need to purchase your Sf6 Switchgear from a reputable manufacturer.

This ensures its durability and quality.

They are also able to repair and maintain your switchgear panel when it encounters problems during its warranty period.

· Future Allowance

The perfect Sf6 switchgear should last an average of 30 years.

This is too long for new developments to occur, such as additional equipment.

It should, therefore, be able to cater for these future needs since it is durable equipment.

· Warranty

Quality Sf6 switchgear will have a warranty period.

During this period, you can freely return it for repair in line with the terms of the warranty

Which Types of Sf6 Switchgear are there?

There are three types of Sf6 Switchgears available.

They are:

• Low voltage Sf6 switchgear connects and disconnects, distributes and interrupts current flow with a voltage of up to 600V
• Medium Voltage Sf6 switchgear isolates, distributes, connects, and disconnects power system with a voltage range of between 600V and 69kV
• High Voltage Sf6 switchgear connects and disconnects, interrupts, and distributes current with a voltage of between 69kV and 230kV.

How does Screened Sf6 Switchgear compare to Normal Sf6 Switchgear?

A Screened Sf6 switchgear offers excellent electromagnetic interference resistance when you compare to normal Sf6 switchgear.

How do you Test Sf6 Switchgear?

You need to conduct the following test when testing Sf6 switchgear:

· Current Transformer Core Test

You need to test the ration and polarity of the current transformer core and compare the results to the primary current injection.

You need to perform this test phase by phase.

· Dielectric Test

The dielectric test is on the auxiliary circuits.

For this test, apply 500 voltage DC between the terminal blocks and the earth point.

· Voltage Tests on the Main Circuit

You need to check on the dielectric strength to remove causes like damage during handling, wrong fastening, and presence of foreign bodies.

Such issues may result in an internal malfunction of the switchgear of not addressed.

· Short-circuit Resistance

This test determines the resistance of the busbars and their breaking, supports, and protective devices to the electrodynamic and thermal stress.

· Temperature Rise Limits

Temperature rise limits help in determining the appropriate operating temperature for Sf6 switchgear.

High temperature has the effect of components aging prematurely, leading to the failure of the Sf6 switchgear.

· Checking Operational Degree

This test determines the operational safety of the Sf6 Switchgear.

It also helps in preventing solid and liquid contaminants from getting in contact with the switchgear.

· Creepage and Clearance Distance

You need to carry out this test between the live parts of the Sf6 Switchgear and also its exposed conductive parts.

You measure the distance between the live parts using the different polarities.

Bolted connections, joints, unsuitable connectors minimize the initial insulation values.

· Protective Circuit Effectiveness

This helps in determining the safety of the Sf6 switchgear.

This test also determines the occurrence of high fault current in case the conductor detaches accidentally.

Effective protective circuits need to withstand optimum short-circuit thermal stress, which happens as per the supply current.

How can you Troubleshoot Sf6 Switchgear?

Troubleshooting Sf6 switchgear depends on the cause of the problem.

The following are the solution to the main Sf6 Switchgear problems.

i. Shutters not Closing

The main reason why the shutter is not closing is due to damaged shutters.

To solve this, you need to repair the shutters and clean the adjustable parts.

You can also apply a lubricating oil in these parts to facilitate the closing.

ii. Indicating Light Extinction

Indicating light extinction may be as a result of the following:

Fuse or resistor burnt, Broken bulb filament, faulty limit switch contactor poor contact of the auxiliary switches.

You need to check on the following to fix this: change the bulb, replace the fuse or resistor, cleaning of the auxiliary contacts, or monitor the MCCB of the fuse terminals.

iii. You cannot Lock the Handle

This problem arises from the rusting of the internal locking mechanism or a faulty locking mechanism.

It may also be that you are using the wrong key to open up.

To solve this problem, ensure that you use the correct key.

You need to lubricate the locking mechanism or replace it altogether.

iv. Poor Control Unit Operation

Poor control unit operation maybe because of unfastened screws of the terminal blocks.

Alternatively, it can be due to an improper connection of the control plug.

You need to tighten the screws for the terminal blocks. You can also connect the control plugs appropriately.

v. Shutters are not Opening

If your shutters are not opening, it may be due to poor adjustment of the moving parts or lack of lubricating in these parts.

Also, it can be due to deformed shutters.

To solve this, you need to adjust and lubricate the moving parts and check on the shutters to ensure they are incorrect shape.

vi. Internal Noise

the cause of your switchgear producing internal noise is due to the electromagnetic induction screws that are on the partitioning plates.

Cable touching gland plates are another source of the internal noise.

Ensure that you have tightened the screws on the portioning plates and applying a layer of sealant on the cable.

vii. Overheated Connections

This is a result of having bolts that are overhead and loose.

To solve this, ensure that you use the rated current value. Also, tighten any loose bolt and replace the busbar if necessary.

viii. The switchgear Fails the Dielectric Test or Ground Fault.

Cracked insulators cause this. Such insulators are prone to moisture or foreign contaminants.

To solve this, you need to replace the insulators.

You can also clean using an appropriate cleaning agent and dry the moisture parts.

What are Sf6 Switchgear Quality Certificates?

The following are the necessary quality certificates for a Sf6 Switchgear:

• American National Standards for Insulators (ANI) standards.
• International Electrotechnical Committee (IEC) standards.
• National Electrical Manufacturer Association (NEMA) standards.
• Institute of Electrical and Electronics Engineers Standards Association (IEEE-SA)
• ISO standards

Which Safety Features does Sf6 Switchgear come with?

The safety features available in Sf6 switchgear include:

· Remote Tracking

Remote tracking enables the removal or installation of circuit breakers from the outside of an arc flash boundary.

· Remote Switching

Remove Switching allows for remote charging, closing or opening of the switches and circuit breakers from a within a safe distance.

· Lock-out/Tag-out

It allows for permanent or temporary lockout Tag-out procedures customization as per the client’s application

Is Sf6 Switchgear Environmentally Friendly?

Yes.

Sf6 switchgear is environmentally safe.

This is due to the use of Sf6 gas, which is a non-toxic, colorless, and odorless gas that has a minimal negative effect on the environment.

How does Sf6 Switchgear compare to Sf6 Circuit Breaker?

An Sf6 circuit breaker is a component of Sf6 switchgear.

The function of an Sf6 Switchgear is to distribute, connect, and disconnect the power system.

The function of a circuit breaker is to protect electrical distribution systems and power supplies.

Are there Alternatives to Sf6 Switchgears?

Yes. There are alternatives to Sf6 Switchgears.

They include:

 Sf 6 Circuit Breaker

• Carbon Dioxide Switchgears uses carbon dioxide as the main insulation material. It is a better alternative since it reduces greenhouse gas emissions better than Sf6 gas.
• Air-insulated Switchgear uses compressed air as the main insulation material. It’s a cheaper alternative to Sf6 switchgear since it is easily available.
• Oil Switchgear uses vaporized oil as the main insulation material. It is the oldest type of switchgear.
• Hybrid switchgear combines both air and gas properties, which act as the main insulation material for the switchgear. It features a compact and modest design containing different functions in a single module.

Other alternatives include Fluor ketone, carbon dioxide, and oxygen for high-voltage (HV) switchgear and Fluor ketone, nitrogen and oxygen for medium-voltage (MV) switchgear.

What is Sf6 Switchgear Specification?

The main specifications for Sf6 Switchgear include:

· Reliability

An Sf6 Switchgear offers a reliable option against power interruption.

This is due to the availability of the SF6 gas that is not prone to faults.

The zero-maintenance feature allows for fewer power interruptions, which ensure that individuals and plants get to enjoy power services.

· Clearance Distance

Clearance distance is the smallest distance through the air between two conductive materials.

It is critical in preventing dielectric breakdown that occurs between two electrodes due to air ionization.

· Space

Sf6 switchgear is a space utilizing switchgear.

The small size reduces the installation space when you compare to Air Insulated Switchgear.

Sf6 Switchgear uses 10% of the space that Air Insulated Switchgear uses.

This feature increases its applicational areas.

· Creepage Distance

This is a measure of the smallest distance on the surface of the insulation between two conductive materials.

Due to electric discharge, corrosion takes place around the surface of this region.

It is, therefore, important that you maintain the creepage distance through a process called tracking.

You need to consider the comparative tracking index and the level of atmospheric pollution when checking on tracking.

· Maintenance

Sf6 Switchgear requires less maintenance, which helps in reducing the overall cost of the switchgear.

This is because of the fewer faults that occur and the inert nature of the SF6 gas.