METHOD AND APPARATUS FOR MEASURING LOAD TAP CHANGER CHARACTERISTICS
First Claim
1. A method of measuring a plurality of characteristics of a transformer comprising a load tap changer and having a primary side with a primary winding having a first number of turns, a secondary side with a secondary winding having a second number of turns, the primary side comprising the load tap changer adapted to be switched between a plurality of tap positions, the method comprising the following steps:
- a) determining a transformer turns ratio, of the primary and secondary windings,b) switching the load tap changer from a current tap position to a subsequent tap position while determining a primary current through the primary winding and measuring a secondary voltage across the secondary side,c) determining a primary voltage across the primary side, andd) determining the characteristics of the transformer based on the transformer turns ratio determined in step a) and the primary current and the primary and secondary voltages obtained in steps b) and c).
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Abstract
A method of measuring the characteristics of a transformer comprises the steps of determining the transformer turns ratio, switching the load tap changer from the current tap position to a subsequent tap position while determining a primary current and measuring the secondary voltage across the secondary side, determining the primary voltage across the primary side, and determining the characteristics of the transformer based on the determined transformer turns ratio, the determined primary current and the measured secondary voltage. Thereby, the static and dynamic characteristics of the transformer including a load tap changer can be determined.
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Citations
15 Claims
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1. A method of measuring a plurality of characteristics of a transformer comprising a load tap changer and having a primary side with a primary winding having a first number of turns, a secondary side with a secondary winding having a second number of turns, the primary side comprising the load tap changer adapted to be switched between a plurality of tap positions, the method comprising the following steps:
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a) determining a transformer turns ratio, of the primary and secondary windings, b) switching the load tap changer from a current tap position to a subsequent tap position while determining a primary current through the primary winding and measuring a secondary voltage across the secondary side, c) determining a primary voltage across the primary side, and d) determining the characteristics of the transformer based on the transformer turns ratio determined in step a) and the primary current and the primary and secondary voltages obtained in steps b) and c). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification