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instrument transformer,application of instrument transformer and construction,types of instrument transformer,type of CT transformer,VT transformer what is instrument transformer? instrument transformer is used in conjunction with any measuring instrument (i.e,ammeter , voltmeter , wattmeter ,watt hour-meter atc)or protective equipment(i.e relays) . it utilize the current transformation and voltage transformation properties to measures high ac current.  Application of instrument transformer:- for measurement of high ac current , it is usual to use low range ac ammeter with suitable shunt . for measurement  of high ac voltage ,low range ac voltmeters are used with high resistance connected in series. for measurement of very high ac current and voltage ,we cannot use these methods . instead , we use specially constructed  HV instrument transformer to insulate the high voltage circuit from the measuring circuit in order to protect the measuring instrument ...

Sensor\types of sensors\working principle\Transducers\Actuators\proximity switches(sensors). what is sensors? A   sensor is a device which  converts a physical event into an electrical signal.or  Sensors  are sophisticated devices that are frequently used to detect and respond to electrical or optical signals. working principle Every  sensor  has different  principle  of operation, based on the type of physical quantity it is measuring. The idea is to create a change in the property/properties of  sensor  (such as resistance, density, shape, temperature etc) as a function of the physical quantity under measurement. classification of the sensors  they are divided into two part Active and Passive sensor. active sensor - Active sensors  have its own source of light or illumination. In particular, it actively sends a pulse and measures the backscatter reflected back to the  sensor .EX-  The  r...