An instrument transformer reduces high voltages and currents to safe values. Access to the latest technology, global sourcing and up-to-date processes ensures long life and meets the most stringent needs defined by the industry. Instrument transformers perform two functions. The core of the transformer can be split with the help of a trigger switch. Hitachi ABB Power Grids is an innovator in instrument transformer technology and has the most comprehensive product line in the market. So to measure voltages above 100 kV, a capacitor potential transformer is used.It is a combination of a capacitor potential divider and a magnetic transformer known as an intermediate transformer of a relatively small ratio.The stack of high voltage capacitors forms a potential divider.

It is connected across current coils of indicting and metering instruments and protective relays. 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. These critical signals provide the basis for circuit-breaker operation under fault conditions, and as such are fundamental to network reliability and security. All units are tailored for specific applications, either to operate accurately at steady state conditions or to maintain reasonable accuracy reading up to extreme fault level conditions. They have many advantages, and these are:We use cookies to ensure that we give you the best experience on our website. The problem with high voltage measurement is that they are quite hazardous and require more … Detail. The transformers are specifically designed to be used with the electrical equipment which falls into a variety of devices known as instruments. And therefore, the core can be clamped around a live conductor very easily to measure the current.Thus this arrangement avoids the necessity of breaking the circuit to insert an ammeter to measure the value of current flowing.

These specially constructed transformers are known as There are two types of instrument transformer.

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. 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. Marine Unique instrument transformer installation solutions for vessel propulsion systems.

To protect the electrical network and help prevent power outages, the contract also includes the supply of gas-insulated switchgear (GIS), air-insulated switchgear (AIS) equipment such as circuit breakers, instrument transformers and hybrid modules.Current Transformers, Inductive Voltage Transformers, Capacitive Voltage Transformers, Combined Current/Voltage Transformers and Station Service Voltage Transformers are designed to transform high current and high voltage levels down to low current and low voltage outputs in a known and accurate proportion specified by the product nameplate ratios. Instrument Transformers.

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