Meter multipliers are used when meters are installed in transformer-rated installations. GF106 CT/PT TESTER is mainly used for field testing, it can finish the measurements (M) and protection (P) class CT, PT and TYP class CT. Such specially constructed transformers with accurate turns ratio are called as Instrument transformers. A current transformer (CT) is an instrument transformer in which the secondary current is substantially proportional to primary current and differs in phase from it by ideally zero degree.. CT Accuracy Class or Current Transformer Class.

If a service has both CT’s and PT’s then the two values are multiplied together to give the billing multiplier. Bill---- … But beware. Here, External CT Ratio = 200/1. CT Analyzer - Current transformer testing, calibration and assessment - OMICRON MF=(CT ratio)*(PT ratio)if HT side eg; =(100/5A)*(11000/110V) =20*100 =2000 in LT side MF=(CT ratio) =(100/5A) =20 (PT is not applicable for LT side) For example, if 150 amps flow through the 300 amp … CT Analyzer with one button click all test items, such as excitation, winding resistance, polarity, phase error, ratio, etc, …

For example, a CT with a ratio of 300:5 is rated for 300 primary amps at full load and will produce 5 amps of secondary current when 300 amps flow through the primary. If the CT ratio is 200:5 and PT ratio is 440:110, then Multiplying factor will be 40 x 4 = 160 External PT Ratio = 220 kV / … The CT Analyzer is a test system for protection and metering CTs according to IEEE and IEC standards. Rajendar Rao Lade. I am JE of Nagbhir sub station of 132/25 kv newly electrified section and testing started of current transformer when test CT ratio by injecting current in primary bushing of old CT which was 20 years old CT installed in circuit,after testing values not found according to ratio,100 amps inject and found in secondary terminal 3.9 amps please send me solution. CT Ratio. The ratio of primary current to the secondary current is known as the current transformation ratio of the CT. Usually the current transformation ratio of the CT is high. Reply. How is the PT ratio calculation or VT ratio calculation performed when the rated PT primary voltage is different from the voltage at which the PT is applied? Some metering systems such as the 3S may require the CT ratio to be cut in half for the multiplier.

A 480:120V rated PT will have a PT ratio of 4. The same principle holds on the derating of lower taps on a multi-ratio CT however. This full featured CT and PT test instrument lowers testing costs by … Some types of equipment employ this method to calibrate the equipment or to permit a single ratio CT to be utilized for several different ampacities of equipment.

For example if a service has 200:5 CT’s and 2.4:1 PT’s, … Let us calculate the Multiplication Factor for our example. Usually both the ratios are 1.

The CT handles much less power. First apply the CT ratio test and find out the information and match with the testing data sheet of that particular CT. check the accuracy class and other parameter of CT and energy meter both. Difference Between Current Transformer (CT) & Potential Transformer (PT) The electrical instruments are not directly connected to the meters or control apparatus of high voltage for safety purpose. Normally the secondary ratings are of the order 5 A, 1 A, 0.1 A, whereas the primary ratings vary from 10 A to 3000 A or more.

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