Your Professional Medium Voltage Switchgear Manufacturer and Supplier in China

KDM Medium Voltage Switchgear

KDM Medium Voltage Switchgear designed to provide the best solution for all electric systems. For electric power distribution, protection, measuring, control, or communication, you can rely on our medium voltage switchgear products. We carry a wide array of the allied domain. In different types, sizes, colors, configurations, and effective features, we had a solution for you.

Our Medium Voltage Switchgear designed and manufactured in accordance with national and international standards. We are passionate to developed products to the highest safety level. In order to maintain professional service and excellent products, we worked hard keeping quality system. KDM fabricate MV switchgear require less maintenance for more convenient and accessible equipments.

All our MV switchgear are processed through the advance machinery. By reason, we are able to actively produce wider product range. Any commercial, industrial or utility electrical system applications, our MV switchgear can preferably meet such requirement. Substation facilities, Power Plant facilities, Electric Power Company Development, KDM MV switchgear is highly reliable. During the production, our QC team meticulously perform quality checked and testing. These are done to assure each component’s safety design, reliability, and flexibility.

In KDM, we have equipped with professional craftsmen that are able to engineer projects and all other responsibilities with responsiveness. With great attention to your specifications, we could fully meet and exceed your expectations. Moreover, this product can be customized for any specific requirements. Our highly-trained and knowledgeable technical engineers can provide bespoke solutions to meet your demand.

Our MV switchgear approved enclosure protection standards from IP2X to IP 5X. Also, we can construct products meeting ANSI, NEMA, UL and CE standards. For more safety and manageable electrical system, KDM MV switchgear is your solution. With rich domain expertise, we are able to upgrade a range of innovative, advanced manufacturing services. Over the last 10 years, we ensure each tough electric product challenge sent us on fully satisfied. Every customer we deal with, we provide individual solutions to ensure they specifically meet desired solutions.

KDM Medium Voltage Switchgears are made up of the best raw materials. Designed with flexibility and robustness, space-saving and cost-effective MV switchgear products are attainable. With our expertise in this domain, we are able to assist you throughout the processes. From engineering, designing, production to transport, we can perform all duties with expertness. Our system is fully controlled with ISO9001 standards. We maintain a quality management system in order to sustain quality production and reliable manufacturing services.

As one of the premier medium voltage switchgear manufacturers and suppliers in China, KDM offers customer-friendly service. With optimum solutions for all electrical system needs of different fields, we design high value-added products and services. However, even though our products are in highest quality form we offered this at a very affordable cost.

KDM MV Switchgear cost-effectiveness, flexibility, and reliability make it one of the world-class products of our company. Thus, our complete range of assistance allows you to aim and fully satisfy your desire.

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Medium Voltage Switchgear: The Ultimate FAQ Guide

The voltage range is a critical parameter you can use to classify switchgear.

It not only determines when to use the medium voltage switchgear, but also specific applications.

If you want to choose suitable medium voltage switchgear that will isolate, protect and control your electrical systems, then you should read this guide.

What is Medium Voltage Switchgear?

 Medium voltage switchgear

Medium voltage switchgear is a device that isolates, distributes, connects, and disconnects power system with a voltage of between 600V and 69kV.

How does Medium Voltage Switchgear compare to High Voltage Switchgear?

A Medium Voltage Switchgear interrupts, connects and disconnect and distributes current with a voltage between 600V and 69kV.

A High Voltage Switchgear connects and disconnects, interrupts and distributes current with a voltage of between 69kV and 230kV.

High voltage switchgear

What is the difference between Medium Voltage Switchgear and Low Voltage Switchgear?

Low voltage switchgear connects and disconnects, distributes and interrupts current flow with a voltage of up to 600V.

Medium voltage switchgear interrupts, connects and disconnect and distributes current with a voltage between 600V and 69kV.

 Low voltage switchgear

Types of Medium Voltage Switchgear are there?

The following are the types of medium voltage switchgear available:

• Outdoor MV switchgear offers reliability for your outdoor electrical application. It has low operation and maintenance costs.
• Substation MV switchgear is ideal for various environmental conditions as it offers reliability and dependability. You can also customize this type to fit your requirements.
• Inside MV switchgear adheres to the set industrial standards while ensuring optimum operation. It comes in different voltage ratings and sizes for your selection.
• Metal-enclosed MV switchgear features a metal casing that encloses the switchgear. It is available either with an automatic or manual switch.
• Metal-clad MV switchgear offers better thermal insulation and a weather-resistant option for your applications.
• Air-insulated MV switchgear has air as the insulation medium. It has passed all the necessary standards and tests such as ANSI, NEMA, IEC, and UL.
• MV switchgear for marine and offshore allows for use in marine applications. it is a compact and flexible unit that you can rely on your applications.
• 33kV MV switchgear offers high rigidity and optimum performance for its use. It goes through all the tests before approval for use.
• Gas-insulated MV switchgear has gas as its insulation medium. It can withstand harsh and corrosive environments while offering optimum performance.
• 12kVMV switchgear includes a wide range of types that fit different applications. It is space-saving which allows for use in space-restricted areas.

What are the Benefits of Medium Voltage Switchgear?

The following are the benefits of using MV switchgear:

· MV Switchgear

MV Switchgear offers a reliable option for your normal power use.

This switchgear has mechanisms that identify faults and enable quick fixation of these faults.

You, therefore, have a reliable power source for your consumption.

· Ease of Assembling

MV switchgear is easy to assemble.

It requires a few expertise to assemble this equipment in addition to reading the manufacturer’s manual.

· Offers Better Protection

An MV Switchgear offers protection to live electrical conductors which ensures the safety of your electrical application.

• Cost

The cost of purchasing and maintaining MV switchgear is lower than the cost of not using one.

An MV Switchgear offers protection to your electrical equipment without which you would experience serious damages to your equipment.

· Ease of Maintenance

Components of MV Switchgear are easily accessible hence allows for quick maintenance in case of occurrence of electrical fault.

How do you Choose Medium Voltage Switchgear Enclosure?

The choice of which MV switchgear enclosure to pick depends on the type of application that is either an outdoor or indoor application.

It also depends on Space availability.

The availability of space dictates which enclosure to pick since large switchgear will require a large enclosure.

Are there Drawbacks of Medium Voltage Switchgear?

Yes.

There are drawbacks of MV switchgear including:

Medium voltage switchgear

· Installation Space

You need to consider the installation space before purchasing MV switchgear.

This can be a challenge when you don’t have enough space.

Installation space should allow for easy operation and maintenance of your LV switchgear.

· Initial Cost

The cost of purchasing MV switchgear is relatively expensive, including the installation cost.

This requires proper planning and budgeting.

· Maintenance

Regular maintenance is a requirement when operating MV switchgear.

A qualified professional should handle this, which can be a challenge when such personnel is not available.

Where can you Use Medium Voltage Switchgear?

You can use MV switchgear in the following areas:

• Transport industry including the railway and subway transport
• Energy generating firms such as wind and solar energy generating industries
• Residential power distribution
• Marine industries such as ships and shipping ports
• Manufacturing industries like steel, mining, and paper industries.
• Underground stations
• Power supply system
• Environmental sensitive installations such as electrical fences

What is the Voltage Range of Medium Voltage Switchgear?

The Voltage range for MV switchgear is between 600V and 69kV.

What are the Components of Medium Voltage Switchgear?

The main components of anMV switchgear are:

• A surge arrestor. The function of these components is to disperse excess voltage within the MV switchgear to the ground. This helps the system to function appropriately.
• Step-down transformer helps in the conversion of voltage from high to low, which the MV switchgear can use.
• Instrument transformers. Their function is to measure the electrical parameters necessary to protect the MV switchgear.
• 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.
• Busbar. A busbar acts as a connector for various lines distributing power to different sections of the MV switchgear.
• Air break switches. They help in the sustenance of two lines or equipment of the MV Switchgear, thus minimizing electrocution. This is through isolation of circuit and equipment within the switchgear.
• Circuit breaker protects the electrical circuit whose source has an overload. They also help in fault interference during a repair.
• The voltage regulator helps in ensuring the MV switchgear uses the right voltage during operation.
• Metal clad. This is the nerve center for distribution lines leaving the MV switchgear. It helps in the isolation of lines during maintenance.
• A Disconnecting Switch/ Isolator. The function of a disconnecting switch in an MV Switchgear is to interrupt small currents which are capacitively coupled or induced.
• Protective relays. This component helps in detecting any fault within the MV switchgear and relays it to the circuit breaker.

How does Medium Voltage Switchgear work?

The main functioning parts of anMV switchgear are the relay and the circuit breaker.

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, thereby releasing the lock.

What should you Consider when Buying Medium Voltage Switchgear?

You need to consider the following before purchasing your MV switchgear:

1. Safety

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

An effective MV should minimize the occurrence of hazards during operation.

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

2. Installation Space

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

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

Space should allow for maintenance movements of the switchgear.

3. Future Allowance

The perfect MV 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.

4. Efficiency

The efficiency of your MV switchgear is a critical aspect. An MV switchgear should be able to operate with minimal interference and maximum output.

This ensures maximum productivity and continuity in your applications.

5. Manufacturer’s Reputation

You need to purchase your MV switchgear from a reputable manufacturer.

This ensures its durability and quality.

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

6. Warranty

A quality MV switchgear will have a warranty period.

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

How do you Test Medium Voltage Switchgear?

You need to conduct the following tests on your MV switchgear to ensure its quality:

· Creepage and Clearance Distance

You need to carry out this test between the live parts of the MV 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 MV 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.

· 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 the low voltage switchgear.

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

· Checking Operational Degree

This test determines the operational safety of the low voltage switchgear.

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

· Low 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.

Which Quality Certifications Should Medium Voltage Switchgear have?

Medium voltage switchgear

The following are the necessary certifications for your MV 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 check on the quality and safety of the LV switchgear.

How do you Specify Medium Voltage Switchgear?

You need to consider the following when specifying an MV switchgear.

· IP Codes

IP codes (International Protection) specify the conditions necessary for the enclosure of the MV switchgear.

It identifies the environmental protection conditions against foreign contaminants such as water and solids.

The basis of the IP codes is IEC 60529, and it consists of two numbers.

The higher the number, the higher the protection requirements.

These two numbers identify the protection of fluid and protection from solid materials.

· Voltage Ratings

There are two aspects of voltage ratings, that is, the rated voltage and the operating voltage.

The Operating Voltage refers to the voltage flowing across the MV switchgear terminal.

The Rated Voltage refers to the optimum voltage value that the circuit breaker or the MV switchgear can receive.

In normal cases, the Operating Voltage value should be less than the Rated Voltage value.

· Insulation Level Rating

Insulation Level ratings include Power Frequency Withstand Voltage, and the Lightning impulse Withstand Voltage.

The Lightning Impulse Withstand Voltage refers to the ability of the MV switchgear to resist overvoltage that results from lightning.

The Power Frequency Withstand Voltage is the ability of the MV switchgear to resist overvoltage that results from closing or opening a circuit.

· Current Rating

This refers to the current ratings that can pass through a bus bar when the MV switchgear closes. This value as per IEC, should not surpass 400-degree Celsius.

· Short Circuit Rating/ Fault Level

A proper MV switchgear should specify its safety to both the operator and the electrical equipment.

It should be able to interrupt a short circuit current, resist short circuit switching and interrupt a no-load current.

This should happen without there being an overvoltage along the circuit. The recommended short circuit rating as per IEC is 31.5kA, 40kA and 25kA.

· Breaker Rating

Breaker rating constitutes operating voltage, interrupting MVA, maximum interrupting Ampere, and momentary current.

The Operating voltage refers to the optimum voltage value that an MV switchgear can achieve.

The momentary current refers to the optimum capability of the breaker’s closed switch to resist the RMS asymmetrical current.

Maximum Interrupting Ampere is the maximum RMS current that a breaker can interrupt in any voltage value.

Interrupting MVA is the product of the voltage and the short circuit current ratings.

How does the Circuit Breaker compare to Medium Voltage Switchgear?

MV Switchgear vs circuit breaker

The function of a circuit breaker is to break off an electric current in case there is an overload.

An MV switchgear helps in the isolation, connection, disconnection, and distribution of an electric current in a piece of electrical equipment.

A circuit breaker is a component within an MV switchgear.

What is Shielded Medium Voltage Switchgear?

A shielded Medium Voltage Switchgear consists of an additional outer casing that offers it protection.

The outer casing also reduces the magnetic interference between the components of the MV switchgear.

This ensures the maximum efficiency of the switchgear.

Which Type of Insulation do Medium Voltage Switchgear use?

The main types of insulation medium for MV switchgear are:

· Air

Air is a common type of insulation medium for use since it is relatively cheaper.

However, its weakness includes having low dielectric strength.

Air also utilizes a large space to withstand electrical arc effects.

· Gas

Gas has better dielectric strength properties than air.

The ideal gas that acts as an insulation medium is Sulfur Hexafluoride (SF6).

The sealing of the electrical contacts of your MV switchgear is within a tank containing pressurized gas.

This helps in reducing the need for contact maintenance.

· Fluid

Fluid offers enhanced dielectric properties than air but less when you compare to Gas.

The advantage of fluid is its cooling effect on the MV switchgear.

Among the various fluids that act as insulation medium include mineral oil, E200 Fluid, Envirotemp FR3 fluid.

Mineral oil consists of petroleum-based products that offer a better electrical insulation medium.

E200 fluid offers a better fire-resistant and biodegradable insulation medium.

Envirotemp FR3 fluid consists of edible vegetable oils and is non-toxic to the environment since it easily biodegrades.

What are the  Safety Protection needed for a Medium Voltage Switchgear?

The safety protection for an MV switchgear include:

• Ensuring there is the shutting off of the main breaker and isolation of the switchgear panel before working on it.
• Ensure that the wiring, the type of MV switchgear, and load requirements match your application requirements.
• Always replace the circuit breaker with the correct amperage ratings
• Always wear the correct protective gear while working on the MV switchgear.
• Take time after switching off the power before handling the main bus bar.
• Always inspect a newly installed switchgear before launching it to eliminate any errors during installation.
• Only personnel with the requisite training and certification should handle the MV switchgear.

Why Trust KDM Steel as leading Medium Voltage Switchgear Manufacturer in China?

KDM steel offers a wide range of benefits and solutions for your MV switchgear including:

· KDM is Reliable

we assure you reliability in terms of performance and durability of our MV switchgear.

In us, you have a manufacturer you can rely on in terms of meeting your requirements within a specific period.

· Informative

Our team offers you the accurate and latest information that helps you in selecting the perfect MV switchgear for your application.

· Customization

We offer al your MV switchgear customization needs.

For this to happen, you need to provide us with accurate specifications.

Our team will go through these specifications and align them with the required standards to ensure you have a quality product.

· Price

You have a variety of pocket-friendly options for your MV switchgear when you select KDM as your manufacturer.

We also negotiate the best price to ensure you never lack your best MV switchgear.

· Warranty

We offer a warrantyfor all our MV switchgear.

This gives you the perfect assurance of the quality of our products.

We guarantee you of quality maintenance and repair when you bring your MV switchgear during the warranty period.

What is Medium Voltage Switchgear Rating?

This refers to the voltage and current requirements that a given MV switchgear can handle.

It is usuallyin Voltage and Amperes.

What is the Recommended Medium Voltage Switchgear Interruption Devices?

The following are the recommended MV switchgear interruption devices that you can use:

· Air Switch

This refers to a switching device that uses air as the dielectric material.

Air has a low interrupting rating compared to vacuum or oil switches.

It is a cheaper interruption device than the other options.

· Oil switch

This is an interruption device that submerges in an enclosure filled with oil.

They are common in pad-mounted MV switchgear due to the oil insulation that allows for the fabrication of a low-profile compact enclosure.

· Vacuum Circuit Breaker

Its operation involves the use of arc quenching and interruption instead of using sealed vacuum bottles.

Vacuum present extinguishes the arc when it occurs which reduces the arc energy.

This type of interruption device can interrupt high voltages when you compare to an air switch interruption device.

It also uses less space than an air switch.

· Fuse

This is an interruption device that interrupts electric flow through the electrical strip or wire melting after reaching a given temperature rating.

In an MV switchgear, the fuse works in handy with the switches to offer overcurrent protection.

· Vacuum Fault Interrupter

This acts as a load breaker switch and as an overcurrent protection device.

This eliminates the need for using a switch and a fuse separately.

· Vacuum Switch

The interruption of current flow in this type takes place within sealed vacuum bottles.

The resulting arc is extinguished quickly by the vacuum.

It utilizes less space and is ideal for higher voltage applications.

How do you Install Medium Voltage Switchgear?

Installing an MV switchgear involves the following steps:

· MV Switchgear Inspection

This involves carrying out a visual inspection to ensure that there are no damages to switchgear.

Also, you need to make sure that it complies with all the necessary certifications.

· Position of the MV Switchgear

The next step is the positioning of the MV switchgear in its location.

Positioning requires a proper clearance and ensuring there is enough space for the MV switchgear.

Space should put into consideration the maintenance space.

· Connections

When installing, you need to connect the cables of the MV switchgear correctly to the electrical equipment.

While making the connections, ensure that you have used the correct voltage and current ratings for the components.

· Final Inspection

After the connections, you need to ensure that all the connections are correct and that the MV switchgear is functioning accordingly.