Product features 600 volt, indoor or outdoor 10 kv bil, 25 60 hertz. To confirm the physical condition and electrical characteristics of current transformer installed in the installation. Introduction of the ct pro xt and ct max series renews the. Moreover i need to know can i connect 33kv line with tr. Fonti cahiers techniques is a collection of documents intended for engineers and technicians, people in the industry who are looking for more indepth. The basics of current transformers nk technologies. These elements are part of the transformer protection in that they limit the accumulated damage that occurs from a transformer feeding high current into downstream faults. Type sch current transformer 600 volt, 10 kv bil, indoor product bulletin 1vap428641db provided by northeast power systems, inc. Tranformers, gasinsulated switchgears, circuit breakers, surge arresters, disconnectors, instrument transformers, and bushings. Gasinsulated instrument transformer for enhanced safety and reliability. Indoor or outdoor current transformers the cmv current transformer is. Medium voltage mv indoor current transformer ct cable kokm.
Air circuit breaker types of acbs, operation and applications. On subtractive polarity transformers the h1 primary lead and the x1 secondary lead will be on the same. Contact your abb representative for outline of tapped design. Figure 144 shows the magnetic field during one cycle. Instrument transformer basic technical information and. Transmission products highvoltage power transmission. Scribd is the worlds largest social reading and publishing site. Primary and secondary windings are located inside the upper part of the transformer. The term dead and live has their own meaning from the view point of potential of secondary windings and core. In sync to the international quality standards, our offered breaker is manufactured at our vendors end using premium quality components and advanced technology. The primary circuits of the current transformer must withstand the constraints related to the medium voltage network to which it is connected.
A current transformer is defined as as an instrument transformer in which the secondary current is substantially proportional to the primary current under normal conditions of operation and differs in phase from it by an angle which is approximately zero for an appropriate direction of the connections. Introduction transformers are a critical and expensive component of the power system. The psg981 indooroutdoor, generator current transformer. Besides siemens transmission products provides power quality products like coils, reactors, phase shifters and. Vacuum circuit breaker 11 kv abb make vacuum circuit. Instrument transformers are used for measurement and protective application, together with equipment such as meters and relays. Totally enclosed, nonventilated tenv 1575kva, threephase. What are the formulae used to calculate current across both side of transformer. The 67n relay offers an alternative to the 87n function. Current transformers principle of operation of ct a current transformer is defined as as an instrument transformer in which the secondary current is substantially proportional to the primary current under normal conditions of operation and differs in phase from it by an angle which is approximately zero for an appropriate direction of the connections.
Cmv and cmvht indoor or outdoor current transformers. Get the best deals on abb current transformers when you shop the largest online selection at. Normally the leakage fluxes x 1 and x 2 can be neglected. Distributor channel partner of vacuum circuit breakers abb 11 kv vcb panel, ht 11 kv vcb indoor type crompton greaves make, 11 kv ht panel and 11 kv vcb panel crompton greaves offered by power line electric india p limited, ghaziabad, uttar pradesh. The cmvhi temp transformer is used for metering on 600 v systems inside high ambient temperature environments 85 c. Technical guide the mvlv transformer substations abb group. The magnetic field around the winding is constantly in motion. Due to the long lead time for repair of and replacement of transformers, a major goal of transformer protection is limiting the damage to a faulted transformer. Abb reserves the right to discontinue any product or service at any time.
Besides siemens transmission products provides power quality products like coils. Cable current instrument transformers suitable for measuring of phase currents in mv swg. Abb offers a complete range of power and distribution transformers, associated products and services. Abb is a major transformer manufacturer throughout the world and offers both liquidfilled and drytype transformers as well as services for complete life. Design, manufacture and of compact substation of 11kv415 volts, equipped with 2000 kva cast resin transformer, 4 way 11kv ring main unit. Vacuum circuit breaker we are counted as the leading trader, wholesaler and supplier of superior quality vacuum circuit breaker. Abbs new compass i integrates circuit breaker and current transformer functionalities within the same footprint of a conventional livetank circuit breaker, and is available with smart gridenabled motor drive. Gasinsulated instrument transformers to enhance safety and reliability, and. Current transformer basics and the current transformer. In case of bus ct, there must be always connected ct shielding to the primary bar. Abb complete and comprehensive range of ct current transformers is the perfect solution for indirect measurement of the electrical parameters that characterize a system, when the network current is above the rated current measurement range of the instrument. The potential transformer is made with highquality core operating at low flux density so that the magnetising current is small. Maximum allowed torques for screw connections of current transformers maximum allowed torque for screw connection of voltage transformer is 20 nm. The sp061 outdoor splitcore bushing current transformer bct is a 600 volt, 10 kv bil rated.
Cmv and cmv ht indoor or outdoor current transformers author. Vacuum circuit breakers abb 11 kv vcb panel distributor. The classification of protection current transformers follows the following. This system limits the ground fault current to a value between 100a and a, being the most common value 400a. Tg gasinsulated high voltage current transformers 72. A cable has to be tested at 500 kv using the above transformer as a resonant transformer at 50 hz. Tg is a gasinsulated high voltage current transformer based on a topcore design, able to withstand current up to 4,000 a and designed for voltages from 72. This transformer step down the voltage to a safe limit value which can be easily measured by the ordinary low voltage instrument like a voltmeter, wattmeter and watthour meters, etc. Mv indoor cable kokm current transformers are suitable for measuring in low voltage switchgear but also for measuring at voltages higher than 0,72 kv. A distinction has to be made between a metering class and a protection class current transformer.
Low voltage current transformers cannot be used as support elements for current busbars they cannot replace support insulators. Indoor or outdoor current transformers the cmv current transformer is primarily used for padmounted distribution transformer metering. The value of this resistance is calculated as r vln ig, where vln is the line to neutral voltage of the system and fault current ig is the ground fault current desired. The complete assembly is then cast in abb polyurethane to provide the final configuration.
Ensure the ct is connected to system properly in all respect primary and secondary. Cmv and cmvht indoor or outdoor current transformers abb group. When mounting a transformer equipped with its own busbar, it should be fastened to the current circuit with the supplied bolt termianals with which the transformer busbar is furnished. Potential transformer pt definition the potential transformer may be defined as an instrument transformer used for the transformation of voltage from a higher value to the lower value. An excellent choice for applications where drytype transformer benefits are desired but the. Recommendations are provided by manufacturers see application guides.
The terminal of the transformer should be designed so that the variation of the voltage ratio with load is minimum and the phase shift between the input and output voltage is also minimum. Difference between dead tank and live tank ct electrical. Abb offers a complete range of the most competitive and innovative highvoltage products 50 1200 kv on the market. Abb library is a web tool for searching for documents related to abb products and services. Read more difference between dead tank and live tank ct. Current transformers ct transformer latest price, manufacturers. At41 indoor current transformer for oilimmersed power.
Instrument transformers will operate successfully under many atmospheric conditions and transients, and switching overvoltages. Siemens transmission products offers all products of highvoltage substations including bundling and their electrical integration to systems up to 1. The transformer shall conform in all respects to highest standards of engineering, design, workmanship, this specification and the latest revisions of relevant standards at the time of. The dimensions of the connection room must necessarily allow the inout.
At35, at38, at41 indoor current transformer for oilimmersed power transformers. This video from abb customer world shows how focs can be easily integrated with dead tank breakers to create more intelligent and precise current measurement. Their role in electrical systems is of primary importance as they are a means of stepping down the current or voltage of a system to measurable values, such as 5a or 1a in the case of a current transformers or 110v or 100v in the case of a voltage. Our range of high voltage current transformer includes both ht current transformer and lt current distribution transformer. Current transformer white paper the basics of current transformers ratio the ct ratio is the ratio of primary current input to secondary current output at full load. Abb library is a web tool for searching for documents related. Instrument transformers application guide abb group. Dead tank itself means that the potential of the tank of ct is at earth potential i. Abb is the leader in power transformers and the largest transformer manufacturer worldwide. This includes circuitbreakers live tank, dead tank, hybrid switchgear, gasinsulated switchgear, generator circuit breakers, capacitors, disconnectors, surge arresters, instrument transformers and service.
Abb offers a complete range of power and distribution transformers designed to grant the reliability, durability, and efficiency required in utility, industrial, and commercial applications. Polarity refers to the instantaneous direction of the primary current with respect to the secondary current and is determined by the way the transformer leads are brought out of the case. A 100 kva, 400 v250 kv testing transformer has 8% leakage reactance and resistance on 100 kva base. Due to the long lead time for repair of and replacement of transformers, a major goal of transformer protection is limiting the damage to.
You buy a combined experience of 700 years of transformer manufacturing. In addition to being far safer and more precise, ncits. A drive isolation transformer dit is designed to specifically handle the mechanical stresses, voltage distortions and harmonics associated with scr applications. Current transformers,voltage transformers and instrument. The transformer shall conform in all respects to highest standards of engineering, design, workmanship, this specification and the latest revisions of relevant standards at the time of offer and the purchaser shall have the power to reject any work or material, which, in his. Method 1 substation with a single transformer when the plant foresees installation of an. Unloading of the supplied 15mva transformer in rwf mrs yard at the place of existing transformer. Current transformers reduce high voltage currents to a much lower value and provide a convenient way of safely monitoring the. Instrument transformers will transmit the signal to the metering and protective.
Equivalent current transformer circuit x 1 primary leakage reactance r 1 primary winding resistance x 2 secondary leakage reactance z 0 magnetizing impedance r 2 secondary winding resistance z b secondary load note. When you buy an abb transformer, you get more than just a piece of metal. The transformer is a static electric device consisting essentially of two or more windings wound on the same core electromagnetic induction transforms electric energy from one circuit to another circuit such that the frequency of the energy remains unchanged while the voltage and current usually change definition of a transformers. The main aim of circuit breaker is to prevent reestablishment of arcing after current zero where the contact gap will withstand the system recovery voltage.