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Medium Voltage & High Voltage Equipment

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Based on the response to recent seminars, the topic of medium voltage equipment and installations is one of high interest.

This article will provide a brief history of the evolution, as seen by the author, of the industry and give a high-level overview of a few key areas from the product standpoint and terminology.

Not so many years ago about 30 , electrical power distribution equipment rated over volts was generally found only in two places, utility systems and large industrial facilities. In utility systems, the power system is owned and operated by the utility. This system consists of generation from some remote location, high voltage transmission lines, and high voltage distribution lines that end at a transformer, serving premises wiring at a utilization voltage less than volts see figure 1.

Large industrial plants, such as refineries, chemical plants, pulp and paper mills, and steel mills demand large amounts of power to operate. To get this power distributed around the plant economically, distribution voltages are typically over volts. There are some exceptions to the above applications, but these are very few. Figure 1. Electrical power distribution system.

Graphic concept courtesy of G. Karady and K. In the past, facilities having systems over volts were handled by specialists well qualified for the design, installation and operation of these systems. One such installation function requiring a specialty skill level is the handling, splicing and terminating of conductors. Traditionally, this was such a specialty that many electrical contractors did not even attempt this work themselves, preferring to subcontract it to other contractors that specialized in this type work.

Today, much has changed. The large industrial plants still have these high voltage systems, but now the voltages found within the plant are much higher. It is not uncommon for main substations operating at , volts kV to be owned and controlled by the plant, rather than the utility.

Going beyond the industrial sector, hospitals, waste water treatment plants, shopping malls, assisted care living complexes, schools even elementary schools are being supplied at medium voltage, commonly in the 5 kV to 15 kV range and taking advantage of utility rates at primary metering.

Products have evolved such that, while care must still be exercised, the art of cable splicing or terminating is no longer the specialty it once was. Complete splicing and termination kits have been developed such that qualified electricians can properly complete a splice or termination by reading and following the directions for the kit.

The use of SF6 insulation systems and vacuum interrupters has also increased in recent years. Use of SF6 or vacuum technologies in switchgear and bus structures has allowed an overall reduction in size of the equipment. In this document, the terms high voltage and medium voltage are used. What do these terms mean and how are they defined? These and many other terms unique to this kind of equipment and installation must be understood before one can begin to properly design, install, maintain, or inspect this equipment.

Anyone working with high or medium voltage equipment needs to begin by learning the terminology and avoiding use of trade language or slang. Low Voltage—per the NEC , this applies to equipment rated and operating at volts or less, with some exceptions. Examples of the exceptions in the NEC include the wire ampacity tables in The IEEE standards define low voltage as equipment rated and operating at voltages volts or less. Because there was very little equipment operating at voltages between volts and volts, this discrepancy between the NEC and IEEE definitions of low voltage had not caused any real issues until a few years ago.

Recently, there have been large numbers of installations of traction power systems that operate between to volts dc. In many jurisdictions, these systems are subject to approval by the local authority. When applying the NEC to these systems, the installer and inspector may be confused as to whether these systems are low voltage or high voltage systems. There may also be similar confusion regarding equipment from overseas manufacturers, which is rated and operated at volts. The following additional voltage terms and definitions are taken from the IEEE standards so the term and the range of voltage covered can be understood.

When designing, installing or inspecting systems over volts, there are several key aspects that must be considered. These relate to the products used and how they need to be handled as well as some safety points when inspecting. This will be a high-level overview and will focus mainly on the medium voltage systems that are most commonly seen today. This overview definitely will not cover all the points from the NEC, product standards and different field situations, but should provide the reader a glimpse into what can be involved when working with these type systems.

First and foremost, any undertaking on medium voltage equipment needs to be done by qualified people. This definition makes it clear that to be qualified the individual must be skilled and knowledgeable on how the equipment is constructed and how it operates. The individual must understand the installation and system in which it is applied, including the fact that the equipment is medium voltage and not low voltage; so appropriate test equipment is used.

There has been more than one case of injury reported in the last few years from an electrician using a low voltage tester digital multimeter or other tester to verify that the medium voltage equipment was de-energized, when in fact, it was not.

The individual must fully understand the hazards involved with working on or near this equipment, and must be aware of the precautions, safety procedures and levels of personal protective equipment required when exposed to live parts at the applicable voltage level. The requirements in Part III of Article also make it clear that the qualifications for working on or around medium voltage equipment are different than the qualifications for working on or around low voltage equipment.

Medium voltage installations involve equipment that falls into one of five major categories. Utilization equipment that operates at medium voltage is typically some sort of motor-operated equipment such as large pumps photo 3 , centrifugal chillers for air conditioning plants, or large capacity electrode boilers. For the vast majority of low voltage equipment, product evaluation and certification is conducted using product safety standards from Underwriters Laboratories UL.

This is not necessarily true for medium voltage products. Specifically, switchgear is classed and is tested to the following standards:. Page 30 of the UL White book provides a quick reference list of those product categories that have UL certifications. Some of these category codes are as follows:. There are some cases where there are several standards for the same product. This multiplicity of standards sometimes creates interesting situations where there are slight differences in requirements between standards.

These differences may not seem like much until you consider that someone making terminations that require a tight fit over the insulation now has to deal with this potential difference. What is normally found is the cable manufacturers will build the cable with an insulation thickness of mils since that would meet the requirements of both standards and allow for standardized terminations.

Photo 4. Installation of typical outdoor medium voltage circuit breaker. The IEEE standards are typically written from a performance and testing perspective and do not have the degree of prescriptive requirements that are typical of UL standards.

For example, the standards for medium voltage metal-clad or metal-enclosed switchgear do not establish firm spacing dimensions between uninsulated live parts, such as busbars of different phases or uninsulated phase conductors to grounded enclosures.

This may result in different manufacturers actually having different designs and spacings for their equipment. These differences may make it very difficult to add a section to an existing lineup of medium voltage switchgear where the added section is from a different manufacturer than the original switchgear.

When equipment is examined in the field, the acceptability of spacings between live parts, and to ground, cannot be determined by visual inspection or measurement alone, there must be some test data to back up the design. For installations subject to the requirements in the NEC , since the field wiring is not subject to this testing, Table In addition, consideration must be given to the expected level of contamination, which can lead to tracking and flash over.

The spacings provided in the NEC are not to be applied to equipment that has been tested and certified, and inspectors need to be careful not to apply NEC requirements to internal construction of equipment. Another difference between low voltage and medium voltage equipment is the use of circuit breakers. With respect to low voltage, a circuit breaker is a single device, having one, two or three poles, that provides a means for switching and also has overcurrent protection within the device.

Typically, the contacts of low voltage circuit breakers use air as the interrupting medium. A medium voltage circuit breaker may have an interrupting medium of air, vacuum or SF6 gas. A medium voltage circuit beaker is essentially a switching mechanism with a mechanical means to open and close springs, pneumatic, solenoid and electrical operators to initiate an open or close sequence.

Photo 4 shows the installation of a typical outdoor medium voltage circuit breaker. One result of this is that there are only a few circuit breaker ratings, typically , , and amps. This rating is the maximum current the circuit breaker can carry continuously. The breaker also has short time and interrupting ratings that are in excess of the continuous rating and these are identified on the nameplate.

To establish the current rating of the circuit and to provide overcurrent protection to meet a design or Code requirement, the designer must specify a current transformer CT of the appropriate ratio, such as and a protective relay with a specific pickup value. The combination of the CT ratio and the relay setting determine the circuit capacity. For example, with a CT ratio of , and a relay setting of 4 amps, the circuit protection then equates to a circuit rating of amps.

In this example, adjusting the protective relay pickup setting from 4 to 5 amps provides a circuit ampacity of amps. The construction and application of fuses also vary between low and medium voltage fuses. While low voltage fuses, applied within their rating, are not intended to expel any gases or hot particles when interrupting an overcurrent, medium voltage fuses can be of the non-expulsion type or an expulsion type see photo 5.

While non-expulsion type fuses are sealed, similar to typical low voltage fuses, expulsion fuses intentionally expel gases that form within the fuse body during fault interruption, typically through a muffler assembly. These gases are very hot and highly conductive. Because of this, the designer and installer must ensure that no other equipment, such as power cables, control wiring, or space heaters are placed in the area or path where these gases are to be discharged.

Other equipment that is in the path will be damaged and may result in a cascading fault by the conductive gases degrading the electrical insulation and initiating another fault. Photo 6. Conduit enters the bottom of the enclosure just to the left of center.

Shielded medium voltage cables have a minimum-bending radius of 12 times the outside diameter per NEC Manufacturers will provide the locations for conduit to enter enclosures so that the proper cable-bending radius can be complied with. Often, this fact is ignored at the time of laying out the conduit in the trenches and then it all gets set in concrete.

Bending cables to less than the required minimum-bending radius during or after installation may create a failure point in the cable.

In photo 6, a conduit enters the bottom of the enclosure just to the left of center. The cable forms a complete loop and then ends in a load break elbow termination. The 12x rule for this cable would require a minimum-bending radius of 12 inches, or for the full loop a diameter of 24 inches.

This enclosure has a inch interior width. As can be seen, this loop has a bending radius of less than the minimum allowed, which creates excessive strain on the layers of the shielded cable that form the complete insulation system. In this case, the improper installation also put sideways pressure on the load break elbow and bushing that also could lead to failure.

In summary, medium-voltage and high-voltage systems are becoming more common in many areas not seen in the past.

Based on the response to recent seminars, the topic of medium voltage equipment and installations is one of high interest. This article will provide a brief history of the evolution, as seen by the author, of the industry and give a high-level overview of a few key areas from the product standpoint and terminology.

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Electrical switchgear manufacturers

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Switchgear Company List

Developing, manufacturing and innovating electrical equipment in Medium and High Voltage , whereby have won public and private organizations awards in recognition of our quality and service. In we moved to Toledo to a 16, m2 building area, where we currently continue to develop our Design, Manufacturing, Marketing and Sales activities for Medium and High Voltage electrical equipments. In , the expansion follows to the Asian market opening a sales office in Shanghai and a technical sales office in Reading UK to cover Northern Europe. Our vision is to provide our customers the best products, services and solutions that fit their needs, being a XXI Century customer oriented company.

The China-Egypt joint venture has successfully established its leading position in the high-voltage equipment manufacturing in Egypt, while helping end the Arab country's previous reliance on import of top-end transformers.

Medium voltage switchgears. Container transformer stations. Overhead connectors. Low voltage switchgears. For over two decades of activity we have delivered thousands of devices to our clients and investors in Poland and abroad. We have installed and launched many of these devices. We would like to present some chosen facilities from recent years, where we have made our mark.

Manufacturers

Our equipment portfolio varies greatly and includes; high voltage power supply units, photomultipliers, large electron beam welding machines, capacitor chargers, laboratory, analytical, military and x-ray equipment. Whatever your high voltage supply requirement, Genvolt has the technical expertise and experience to meet even the most demanding applications. We offer a wide range of advanced high voltage power supply, services and products to our vast list of clients all across the globe.

Since then, the Company has continually developed numerous epoch-making products for circuit protection, which formed a solid foundation for producing safe electric products. We will reach a significant turning point in the next few years that will revolutionize people's value. The company will not only continue to delve into fields related to reducing our burden on the environment, beginning with renewable energy, but also challenge brand new fields according to the demands of the successive new generations.

Supplier Discovery. Sign In. Join Free. Inquiry Basket. Get Apps. Search by image. Products Suppliers Sourcing Requests Suppliers. All Categories. Post Sourcing Request. Product List Supplier List. Yaxu Intelligent Technology Co.

MV & HV Equipment in Transmission and Distribution Systems product certification, production supervision, factory acceptance tests, quality assurance.

WE’RE A GLOBAL SUPPLIER OF POWER AND ELECTRICAL CABLES

Established in , Synergy Cables offers a complete spectrum of products for power and control applications, ranging from low, medium and high voltage power cables up to kV as well as control, airfield lighting, EMC and industrial cables. Synergy Cables assures each customer a tailor-made solution to its needs, combined with logistical expertise. The company is ISO certified. Our manufacturing facilities continuously incorporate the latest state-of-the-art equipment, technologies and management techniques. Rigorous vendor selection plus testing and monitoring, starting from raw materials through all stages of cable production, ensure quality excellence and years of trouble-free service. We manufacture these cables according to UL guidelines.

high voltage switchgear manufacturers & suppliers

NKT is a global company with manufacturing facilities in Europe which enable us to design, manufacture and market our high-quality products as well as push the boundaries of technological innovation in our field. Our manufacturing plants are among the most modern, flexible and cost-effective in the world, and we continuously invest in our manufacturing facilities to keep them at the highest technological level. Our state-of-the-art facility in Cologne, Germany is a unique example with specialized technical innovations which have been integrated into the factory to make the production as efficient as possible and our factory in Karlskrona, Sweden, is a center-of-excellence for production, installation and service of high voltage cables in both AC and DC for submarine and underground applications. All our production sites have their own testing facilities onsite, and especially our plant in Karlskrona offers some of the most advanced testing equipment in the industry. The factory has been constructed on the basis of facilitating optimal cable production and an optimum of environmental protection.

Spotlight: China-Egypt joint venture leads high-voltage equipment manufacturing in Egypt

People on power solutions iberapa a family business company with a global vision, we develop and manufacture equipment and solutions for electric power distribution, in medium and high voltage overhead lines, as well as transformer stations. The distribution, control, protection and transport of electric power in medium and high voltage, is our business.

Switchgear Company List. Lancaster, PA Global Switchgear Market.

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