The transformers are specifically designed to be used with the electrical equipment which falls into a variety of devices known as instruments. If you continue to use this site we will assume that you are happy with it. It is impossible to measure such a high voltage directly by a voltmeter. These specially constructed transformers are known as There are two types of instrument transformer. They have many advantages, and these are:We use cookies to ensure that we give you the best experience on our website. Therefore, a PT having a secondary to primary turn ratio 1:100 is used in conjunction with a voltmeter, which steps down the voltage from 11 kV to 110 V, as shown in the figure.For the measurement of power in a high voltage power system, both CT and PT are used. Instrument Transformer • In power system, the currents and voltages are very large – Therefore, their direct measurements are not possible. Hitachi ABB Power Grids is an innovator in instrument transformer technology and has the most comprehensive product line in the market.

Ratio or multiplication factor in the first case is 400 and in the second case 500.The primaries of PT are rated from 400 V to several thousand volts and secondaries always for 110 V. Up to voltages of 5,000, potential transformers are usually of the dry type, between 5,000 and 13,800 volts, they may be either dry type or oil-immersed type, although for voltages above 13,800 they are always oil-immersed type.The ratio of the rated primary voltage to the rated secondary voltage is known as the turn or The rated burden of a PT is the VA burden, which must not exceed if the transformer is to operate with its rated accuracy.The maximum burden is the greatest VA load at which the PT will operate continuously without overheating its winding beyond the permissible limits.Let the voltage to be measured of a power system is 11 kV. By changing the shunt resistance of the milli-ammeter circuit ranges from 0 – 5 A to 0 – 600 A. When used for protection purposes, the instrument transformer outputs must accurately represent the transmission line values during both steady-state and transient conditions. It employs a customized power quality solution to ensure grid compliance and enhance energy efficiency. Instrument transformers perform two functions. These are:These instrument transformers are also used in the power system in conjunction with protective relays.

Instrument Transformer is an electrical device of high accuracy that is used to transform or isolate current or voltage levels. CTo get the satisfactory performance of the complete unit, the intermediate transformer must have a very small ratio and phase angle error.The instrument transformers are extensively used for very precise measurements as well as for routine measurements. • It might appear that the extension of range could be conveniently done by the use of shunts for currents and multiplier for voltage measurement, as in DC. The ratio of primary current to the secondary current is known as the The product of voltage and current on the secondary side when it is supplying its maximum rated value of current is known as the rated Also, current in the secondary of CTs is governed by the current in the primary winding i.e., power circuit current.

The secondary current ratings are of the order of 5 A, 1 A, and 0.1 A. The Metropolitan Electricity Authority (MEA) of. Specifically designed instrument transformers for industrial applications, our range can be manufactured to many international standards such as IEC, IEEE & AS. Free Standing Fiber Optic Current Sensor FOCS-FS for digital substationsStation service voltage transformer for step-down service (69 - 145 kV)Station service voltage transformer TIP (72.5 – 550 kV)Station service voltage transformer SSVT (46 - 362 kV) Some of the important benefits offered by Hitachi ABB Power Grids supply are: Sohar Aluminium in Oman is one of the world’s largest aluminium smelter facilities. Instrument transformer from low voltage to medium voltage (0.6-40.5kV) Current transformer, voltage transformer, potential transformer, Indoor type and outdoor type Oil immersed type or epoxy resin type

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