Monitoring tap changer switching
AssigneeABB Power Grids Switzerland AG
InventorBengt-Olof Stenestam
Life of this patent
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Abstract
The present disclosure relates to a method of monitoring switching by an on-load tap changer (OLTC) 1 from a first contact 3a to a second contact 3b of a transformer winding 2. The method includes measuring a voltage of the transformer. The method also includes measuring a temperature of the OLTC. The method also includes, based on the measured voltage and temperature, determining whether the switching from the first contact to the second contact has been successful.
Claims17
A method of monitoring switching by an on-load tap changer, OLTC, from a first contact to a second contact of a transformer winding during a switching time period, the method comprising:
- measuring (M1) a phase voltage of the transformer over time;
- measuring (M2) a temperature of the OLTC over time;
- based on the measured voltage and temperature, determining (M3) that the switching from the first contact to the second contact has not been successful;
- wherein the determining (M3) includes determining that the measured voltage has changed during the switching time period and that the change is above a predetermined threshold;
- and
- wherein the determining (M3) includes determining that the measured temperature continues to rise after the end of the switching time period.
A computer program product comprising computer-executable components for causing a controller to perform a method of monitoring switching by an on-load tap changer, OLTC, from a first contact to a second contact of a transformer winding during a switching time period, the method including the steps of:
- a method
- measuring (M1) a phase voltage of the transformer over time;
- measuring (M2) a temperature of the OLTC over time;
- based on the measured voltage and temperature, determining (M3) that the switching from the first contact to the second contact has not been successful;
- wherein the determining (M3) includes determining that the measured voltage has changed during the switching time period and that the change is above a predetermined threshold;
- and
- wherein the determining (M3) includes determining that the measured temperature continues to rise after the end of the switching time period.
A controller for monitoring switching by an online tap changer, OLTC, from a first contact to a second contact of a transformer winding during a switching time period, the controller comprising:
- processing circuitry;
- and
- storage storing instructions executable by said processing circuitry whereby said controller is operative to:
- measure a phase voltage of a transformer over time;
- measure a temperature of an OLTC of the transformer over time;
- based on the measured voltage and temperature, determine that switching from a first contact to a second contact of a winding of the transformer has not been successful;
- wherein the determining includes determining that the measured voltage has changed during the switching time period and that the change is above a predetermined threshold;
- and
- wherein the determining includes determining that the measured temperature continues to rise after the end of the switching time period.
Dependencies are inferred from the claim text.