Switchgear Current Transformer

Powercom: Authorized Dealer Of Toshiba Ups / Power Conditioners

Powercom, an Authorized Distributor of ONEAC and TOSHIBA power conditioning and
Un-interruptible Power Supplies (UPS) was founded in 1989 as an engineering centric
company specializing in Computer Grade Power, Modems, Multiplexers and CSU/DSU's. In October of 2008, it was purchased by Morris Danhi.

The company has recently been awarded the contract to supply Toshiba UPS systems to Verde Engineering for the installation of several 22kVA Toshiba 1600EP UPS’, an
80kVA Toshiba 4200FA UPS, and a 160kVA Toshiba G9000 UPS. These highly
reliable, high performance systems are being installed at Time Warner Cable Company facilities for Power Conditioning and Battery Back-Up purposes.

In terms of uninterruptible power systems (UPS), Powercom, the authorized dealer for TOSHIBA UPS offers a wide variety of affordable, efficient and effective solutions.
Designed for stand-alone or parallel use in up to four-unit configurations without requiring the use of a special switchgear cabinet, the G9000 series UPS is available in capacities of 80, 100, 160 and 225 kVA and comes with an industry-leading three-year onsite warranty.

Also available is the Digital Signal Processor (DSP) Control, Fully Digital IGBT Converter & Inverter. It has a High Efficiency (96%) Over Wide Load Range, Transformer-Less Design, N+1 and N+N (Up to Four in Parallel) Capability, Dual-Input Feed, Electronic Battery Isolation, RS232 and Dry Contact Interface, Small Footprint, and Lightweight Design.

Toshiba’s Single Phase 1000 Series
The 1000 Series of Toshiba’s single phase UPS devices offers clean single-phase power to any critical system. It features auto-restart, cold start, a programmable load shed receptacle, an intelligent charger, wide input voltage window and multiple-language LCD display… standard. Available in Rack or Tower mounting. Sizes include: 1.0, 1.5, 2.0 and 3.0 kVA.

As a double-conversion on-lineUPS, it’s especially practical for industrial systems, health care environments, laboratories, small business offices, point-of-sale retailers, internet service providers, data center and wiring closets.

Toshiba’s Single Phase 1600 EPSeries
With a double conversion online UPS system, the Single Phase 1600 EPSeries from
Toshiba has a great tower design look. It features hot swappable batteries, hot swappable cooling fans, internal isolation transformer, digital LCD display, a wide input voltage window, power factor correction and an excellent output power factor of 0.85.

Toshiba’s Single Phase 1800 Series
Available in 2.4kVA, the Toshiba 1800 Series can supply uninterrupted, clean single-
phase power to critical systems even if the utility power fails. It offers true on-line
double conversion, PWM input PF correction UPS, an isolation transformer, high
overload and CF for motor type loads, auto-restart, cold start features, increased input voltage window (for increased battery life), four fan speed, and wide input frequency.

Toshiba’s Three Phase 4200 FA CT Series
Designed as a state-of-the-art UPS system with a surprisingly small footprint, the Toshiba 4200 FA series meets customers’ needs to a “t”. It has the largest input voltage and frequency window in the industry, allowing the unit to be user-friendly. The front-end IGBT design of the Toshiba power conditioning unit allows it to work optimally at 0-100% load. Best of all, the Toshiba 4200 FA comes with a standard three-year warranty. Designed for internal batteries and internal maintenance bypass,
there is no need for additional cabinets.

In addition, the 4200 FA CT characteristics include true on-line double conversion, an
input power factor of greater than 0.98, an input current of less than 3%, electronic power factor correction, 100% unbalanced load capability and SNMP/web-based monitoring.

Featuring a high-performance insulated gate bipolar transistor (IGBT), the Toshiba
G8000 Series has taken on the world’s top share. As the first in the industry to employ IGBT high-speed power elements in UPS, Toshiba continues to apply advanced technologies.

The G8000 Series includes advanced features which are standard on all G8000 UPS
Systems: 0.98 input power factor, low input current THD, generator-friendly design,
space-saving footprint, front access design, 24/7 monitoring/service, SNMP/HTTP
remote monitoring, user-friendly interfaces and redundant inputs.
window for complete generator compatibility.

In Addition, The 4200 FA XT Series from Toshiba, like the 4200 CT Series (above), has a three-year warranty, standard. Designed for External Battery Options for Custom Battery Back-up time, and External Isolation Transformer(s).

Toshiba's Three Phase 4200 FX XT Series
Features include electronic power factor correction, complete front access for installation and service, batter-friendly charger design, internal isolation transformer option and multiple three-phase voltage combinations.

Toshiba's Three Phase G 8000 Series
Featuring a high-performance insulated gate bipolar transistor (IGBT), the Toshiba
G8000 Series has taken on the world’s top share. As the first in the industry to employ IGBT high-speed power elements in UPS, Toshiba continues to apply advanced technologies.

The G8000 Series includes advanced features which are standard on all G8000 UPS
Systems: 0.98 input power factor, low input current THD, generator-friendly design,
space-saving footprint, front access design, 24/7 monitoring/service, SNMP/HTTP
remote monitoring, user-friendly interfaces and redundant inputs.

Toshiba's G9000 Series-
The G9000 series UPS is available in capacities of 80, 100, 160, and 225 KVA and comes with an industry-leading three-year onsite warranty. It is designed for stand-alone or parallel use in up to four-unit configurations without requiring the use of a special switchgear cabinet.It incorporates the next-generation IGBT technology and has a wide input voltage range.

About the Author

Powercom is an authorized dealer for ONEAC and TOSHIBA and a leading provider of Uninterruptable Power Systems and Solutions that help small, medium and large size companies keep their operations running 24 hours, 7 days a week.For more information on the Toshiba Line of power conditioning and Un-interruptible Power Supplies, please visit - powercom.com

Environmental Safety And Improvement Trend Of High Voltage Electrical Appliances Makers

"Kyoto Protocol" set forth in a single of the six greenhouse gases sulfur hexafluoride (SF6) fuel emissions into the atmosphere primarily via the electrical power transmission and distribution equipment, especially higher voltage switchgear, transformers, transformers and fuel insulated transmission pipelines and other merchandise are in the experimental investigation, production, transportation and operation and preservation produced in the approach.

SF6 gasoline in substantial voltage electrical items account for about the software of SF6 gas applications, 80%, whilst the SF6 fuel change gadget is at present foremost the field of substantial voltage change merchandise, but also ultra substantial strain and particular high voltage switchgear programs and growth of the major directions, so comprehension of the surroundings changes and developments in the safety and handle emissions of SF6 gas into the ambiance to review the SF6 gasoline in the power switching units for energy switching applications of excellent importance to the improvement of devices.

Atmospheric environmental safety scenario December eleven, 1997, 149 nations and areas, representatives, adopted the "Kyoto Protocol" provides for six greenhouse gases (GHG), which are: carbon dioxide, methane, nitrous oxide, hydrofluorocarbons, perfluorocarbons , sulfur hexafluoride. This Protocol was February 16, 2005 came into impact, which offers that throughout the period from 2008 to 2012, the main industrial greenhouse fuel emissions by developed nations in 1990 on the basis of an regular of 5.two%, of which the EU will be six sorts of greenhouse gases emission reductions of 8%, 7% reduction of United States, and Japan six%, Canada six% reduction, Eastern European countries, reduction of five% to eight% New Zealand, Russia and Ukraine do not have to lower emissions can be stabilized at 1990 ranges Protocol although permitting Ireland, Australia and Norway, respectively, in comparison with 1990 emissions improved by ten%, eight%, 1% establishing nations have emission reduction obligations.

China on May 29, 1998 signed the "Kyoto Protocol", August 30, 2002 formally authorized the "Kyoto Protocol", although China has not offered herein emission reduction obligations, but authorities predict that China's C02 emissions will quickly overtake the U.S. as the world's very first one, when the time will inevitably be to fulfill the "Kyoto Protocol" emission reduction provisions. In the "Eleventh 5 Year" time period created it clear that to fulfill the "Kyoto Protocol" obligation, so SF6 gasoline in other appliances, such as transformers, transformers, load switches, transmission pipelines, and many others. The software and growth of SF6 gas into the atmosphere ought to be deemed the emissions, the study of a lot more setting pleasant enterprises to adapt to the financial advancement packages.

Characteristics of SF6 gas The review identified that at atmospheric strain beneath the uniform electric area power of SF6 gas insulated air three instances, even though less than the insulating oil and the higher vacuum state, but the boost of SF6 gas stress, the insulation power will be higher than that of insulating oil, and higher vacuum. With air contrast study also discovered that, in the arc discharge cases, the air temperature gradient is fairly small, rough arc, SF6 fuel, the general temperature is lower, mostly concentrated in high temperature elements of the arc. Consequently, SF6 gasoline in the arc minimize off extremely speedily soon after the cooling, insulation and resilience of good air about one hundred occasions. SF6 gas on the environmental affect of SF6 gasoline molecular bodyweight is 146, the air density is about five times. SF6 gases in the ambiance to endure life is 3200 a long time. For that reason, SF6 fuel is a very strong greenhouse gases. SF6 is a greenhouse fuel CO2 to the ambiance of 23900 occasions.

In addition, SF6 gas change device in the approach of breaking currents will create arc, the arc will SF6 gasoline under substantial temperature decomposition, but also will develop metal vapor arc of make contact with, because of to the presence of water in interrupter will be damaged down, decomposed material will create secondary response to type HF, S02, SOF2, SOF4, SO2F4 and other dangerous substances. These substances will be corrosive internal metal elements, if these substances emitted into the environment on the person's physique can result in injury and stimulation.

Application and Growth of SF6 Fuel In 1953, the United States first SF6 gas employed in 115kV load switch devices, in 1958, Westinghouse developed a tank along the lines of the compressed air circuit breaker 220kV double stress kind SF6 circuit breaker. The principle of this circuit breaker through the SF6 gasoline from compressed gas cylinders (one.5MPa) the flow of lower pressure fuel chamber (.3MPa) and the cooling breaking arc. With this double pyramid structure, also created the ceramic pole SF6 circuit breaker. Followed by Europe and Japan on the SF6 gas switch unit production technological innovation study has made great progress and development. The emergence of SF6 circuit breaker is a substantial voltage power system circuit breaking in from the oil circuit breakers, compressed air circuit breaker engineering has begun a series of technological advances of recent benefits.

It is with the oil circuit breakers, compressed air circuit breaker benefit is that a single fracture in contrast with the high voltage, arc quenching capacity, breaking present, circuit breaker, light bodyweight, run modest electrical power, higher reliability, very low maintenance, keeping away from the oil circuit breakers inclined to fire breathing, fuel injection and other undesirable phenomena, in addition to structural diversification interrupter chamber (variable air strain to open away from the ceremony, scheduled to open away from the pressure air kind, self electricity type and combined sort) and so on.

SF6 gas change gear, the continuous development of the framework of distinct types of items, such as the tank and ceramic column SF6 circuit breakers, GIS, HGIS, compound and so on. Like GIS, HGIS, and complicated type can have a wide range of product layout, these attributes let the person in the design and style of energy system substation, it can be selected according to diverse scenarios. Because 1979, China commenced to introduce, or with foreign countries to build 72.5kV ~ 550kVSF6 higher voltage switchgear, after decades of growth, SF6 electrical appliances manufacturing enterprises improved 12 months by year. At the moment, domestic enterprises can produce medium voltage (12kV), high voltage (40.5kV ~ 252kV), EHV (363kV ~ 550kV), and ultra higher voltage (800kV 1100kV) SF6 high voltage switchgear.

Since SF6 gas has superb insulating and arc quenching efficiency of the electrical installations to accomplish the economic oriented, lower preservation oriented operation and room conserving, SF6 gasoline has also started to high voltage transmission and distribution gear in the transformer, transmission pipelines and transformer locations these kinds of as software development. At current, Japan is the country with the most significant creation of SF6 transformers, Mitsubishi, Toshiba, Hitachi, Fujitsu can produce.

SF6 transformers can be done at existing ranges of 500kV and 300MVA. I also have the domestic manufacturing 10kVSF6 transformers, some of them with foreign firms set up a joint venture and have the 110kV and above, SF6 transformer production ability. In addition to higher voltage SF6 fuel circuit breaker in the transmission and distribution gear, GIS, load switches, transformers, transformers and fuel transmission pipeline is applied, there are a little portion of the SF6 gas is used in sports footwear, scuba diving with breathing apparatus, medical subject, thermal insulation glass windows, casting technology utilised to defend the fuel, pneumatic tires, and military and other non electrical products.

As the entire world energy business improvement, particularly in recent many years, China's sustained and speedy growth of energy industry in purchase to meet electrical power need, continual enhance in grid building and renovation, producing the number of substantial voltage power transmission and transformation equipment, demand for an unprecedented expansion, improved SF6 gasoline utilization, but also an improve of SF6 gasoline into the environment emissions. SF6 gasoline for electrical energy can be witnessed that the contribution of the constructing the larger the contribution to atmospheric greenhouse impact is also increasing.

SF6 gasoline emissions into the ambiance signifies SF6 fuel emissions to the atmosphere generally via the power transmission and transformation gear, pressure testing of new products, ability, breaking test, factory test, transfer of products, transportation, set up, operation, equipment upkeep and so on. The United States in the course of the period of time from 1998 to 2002 the manufacturing and processing of higher voltage circuit breakers put in in the SF6 gasoline leakage charge had been investigated. As a outcome, ten% of the circuit breaker leak may exist. Leakage explanation: 73% occurred in the fuel installation, 21% is because of to worn and damaged casing, and six% is due to leakage of gas containers.

SF6 gas emission reduction measures and improvement pattern of SF6 electrical Route of advancement of large voltage electrical goods, specifically the SF6 high voltage electrical goods, need to be to minimize emissions of SF6 gas to the environment, the course of the improvement of particular measures contain: one, raising the technological level of manufacturing approach gear, minimizing the leakage rate of SF6 electrical gear. two, to advertise the miniaturization of SF6 electrical equipment and decrease the quantity of SF6 electrical gear in buy to lessen the use of SF6 fuel. In purchase to considerably advance the miniaturization of GIS and non SF6 technological innovation, Mitsubishi Electric Co., Ltd. to SF6 gas and thick movie dielectric coated electrode composite insulation system as an object to study the insulating properties of large pressure areas. By utilizing thick movie dielectric coated with each other, can attain curb the dimension of the metal electrode impact induced by the breakdown electric subject decline can lessen the electrode room, the largest gas field, to attain gadget miniaturization. As far as possible a higher diploma of integration, layout and versatile composite electrical appliances or HGIS.

3, establishing low strain of the SF6 switchgear and SF6 fuel combination of electrical products. Countries in the planet has been learning choices to SF6 gas for several many years abroad on a variety of combined gases (this kind of as SF6 N2, SF6 CO2, SF6 CF4) in the PD qualities of insulation breakdown attributes of the review discovered that for the liquefaction temperatures had been especially reduced, non poisonous and stable N2 gasoline, combined with 20% of the SF6 fuel and the non uniform electrical discipline in the partial discharge starting voltage (PDIV) and dielectric breakdown voltage (BDV) has enhanced the likelihood of, and, also discovered in large gasoline pressure, can get one hundred% SF6 gasoline with roughly the exact same insulating properties. So SF6 N2 is thought to be the desired alternative to SF6 gasoline. At current, the world's first hybrid gas insulated high voltage lines N2 SF6 in Geneva completed. ABB has produced LTB 72.five kV a 145kV GCB and HPL72.5 300B1 type GCB can be employed either pure SF6 fuel can also be used SF6 N2 fuel combination. When utilizing SF6 N2 combined gasoline, at 20 ? Rated air pressure .7MPa (absolute), it can be used in 50 ?, even though in pure SF6 gasoline .5MPa (absolute), the only for 40 ?. Toshiba also N2 SF6 combined gasoline circuit breaker is studied.

4, in the devices production and gear servicing in the course of the use of sophisticated SF6 gasoline recovery unit, the recovery through a selection of filters to get rid of the SF6 gasoline in the water, oils, dust, and other elements resultant decomposition. Attain SF6 gasoline recycling.

five, in the medium voltage (12kV forty.5kV) locations, use of non electrical SF6 and vacuum switchgear, substantial voltage (forty.5kV ~ 252kV) fields to the particular large voltage (800kV 1100kV) regions, to develop a vacuum circuit breaker (VCB), to upgrade engineering and equipment to lessen production fees VCB, vacuum switchgear to obtain a huge amount of substantial pressure region so that lively rejection vacuum circuit breaker (VCB) of large voltage oriented investigation operate, to accomplish higher voltage of VCB and EHV oriented.

six, protection of atmospheric setting, and foster awareness of emission reduction. Japan is the use of SF6 fuel more countries, in purchase to implement the "Kyoto Protocol" on SF6 gas emission reduction obligations, NEC Company Association, the Japanese electric market to achieve this objective will be taken good action. Japan SF6 fuel reduction measures is to create a check out curb emissions, to replace SF6 gas insulated devices curb emissions, recycling method, and has taken action to strengthen the SF6 fuel management method. Germany's high voltage switching equipment business is also really nicely created. Annual use of SF6 fuel is about 1000t. In order to accomplish reduction of SF6 gasoline emission targets, October 19, 2005, the energy to run market and electrical gear production business associations and Solvay Fluor GmbH (SF6 fuel production) firms and the German Atmosphere, Nature Conservation and Nuclear Reactor Basic safety for additional provisions of the Federal Ministry of have attained a consensus on their own obligations.

Your home electrical system is generally something to take seriously. New York Electrical and Electrical is ready to come by your house whenever and any day. We will be happy to provide you with our residential electrical services. No electrical problem is too large or too small for us to handle.

Why current transformer alwyas works under short circuit condition?

In one of our panel drawings of 6.6KV switchgear we have 3 core CT and secondary of this CTs are being shorted and ground? what should be reason?

A current transformer should never be open-circuited while main current is passing through the primary winding. If the load is removed from the secondary winding while the main circuit current is flowing, most of the primary winding current becomes magnetizing current, but the vector angles change in such a way as to keep the total current in the primary the same as before. Because the main circuit is now mostly magnetizing current, the flux in the core shoots up to a high level and a very high voltage appears across the secondary. Due to the high turn ratio usually found in these transformers, the voltage in this condition can reach a dangerously high level, which can break down the insulation. It also becomes a hazard to personnel. The high flux can saturate the core and result in strong residual magnetism left in the core, thereby increasing magnetization current and introducing error in the transformation ratio. One has to put a short on the secondary winding before removing the secondary load while the main current is flowing through the primary winding.

Testing CTs installed in Transformers and GIS