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Explain differancnce between instrument current transformer and measuring current transformer?
Wiki User
∙ 14y ago
Current transformer is a device used to measure the flow of current through a power system and the measured current is inputted to a protective relay system. It is used to detect system malfunction.
Current transducer is a device used to measure AC and DC current based on the halt-effect technology.
Wiki User
∙ 14y ago
Wiki User
∙ 14y agoInstrument current transformer is used to adjust the output voltage from power source to be conveniently used by instrument.
Measuring current transformer is used to measure AC currents.
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Current transformers are used to transform high currents to standardized values for control equipment as relays and meters.The primary winding in a current transformer is incorporated in the line and carries the current flowing in the network. The magnitude of the secondary current is dependent of the ratio of the transformer. A current transformer (CT) is a type of instrument transformer designed to provide a current in its secondary winding proportional to the alternating current flowing in its primary. They are commonly used in metering and protective relaying in the electrical power industry where they facilitate the safe measurement of large currents, often in the presence of high voltages. The current transformer safely isolates measurement and control circuitry from the high voltages typically present on the circuit being measured. The most common design of CT consists of a length of wire wrapped many times around a silicon steel ring passed over the circuit being measured. The CT's primary circuit therefore consists of a single 'turn' of conductor, with a secondary of many hundreds of turns. The CT acts as a constant-current series device with an apparent power burden a fraction of that of the high voltage primary circuit. Hence the primary circuit is largely unaffected by the insertion of the CT. Usage Current transformers are used extensively for measuring current and monitoring the operation of the power grid. The CT is typically described by its current ratio from primary to secondary. Often, multiple CTs are installed as a "stack" for various uses (for example, protection devices and revenue metering may use separate CTs). Similarly potential transformers are used for measuring voltage and monitoring the operation of the power grid.
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at first point you should determine the also the secondary voltage of the transformer, secondly you should explain what is the application of this transformer. if you want a special transformer, it is you to decide how much power is needed to be transferred via transformer, and designer tells you it is economical or not. by the way, if i want to refer you to a standard close to your application, following sizes are available for a 20kv/400v transformer: 50kVA,100kVA, 150, 200,315,500,630,800,1200,1600,2000,2500 and 3500kVA i hope this helps you
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Your question is rather oddly phrased as, obviously, there are countless ways in which you wouldn't use a potential transformer! It's much easier to explain why you would us a potential transformer. A potential transformer (known outside North America as a 'voltage transformer') is classified as an instrument transformer, which means that its output is used to drive instruments, such as voltmeters and (the voltage coils of) wattmeters, etc., or to provide inputs to protective relays. It's function is twofold: (1) to reduce the high voltage of the circuit to which its primary winding is connected to a lower voltage which can be 'read' by a voltmeter, etc., and (2) to electrically-isolate its secondary circuit from the primary circuit for the purpose of safety.
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