Temperature compensation for current transformer metering
AssigneeSchneider Electric USA, Inc.
InventorJames Edward Carelock
Life of this patent
Estimating the term…
Abstract
System and method of determining temperature compensated current for current transformer (CT) metering. A CT assembly having a temperature sensor mounted within the housing enables the measurement of temperature of the CT. The PCBA of the CT transmits the current and temperature to a trip unit. The trip unit both displays the measurements, and calculates a temperature compensated current. The trip unit may trip a breaker or generate alerts based on temperature measurements within one or more CT assemblies or based on variance in the current between multiple CT assemblies.
Claims20
A system for temperature compensation in transformer current metering, the system comprising:
- a current transformer (CT) assembly comprising:
- a CT configured to generate a current signal representative of a current in a conductor passing through a core of the CT;
- a housing enclosing the CT;
- and
- a temperature sensor associated with the CT, the temperature sensor enclosed within the housing;
- a trip unit communicatively coupled to the CT, the trip unit comprising:
- a processor;
- and
- a memory coupled to the processor, the memory storing computer-executable instructions that, when executed by the processor, configure the trip unit for:
- receiving a temperature measurement from the temperature sensor, the temperature measurement indicative of a temperature of the CT;
- receiving the current signal from the CT;
- and
- calculating a temperature compensated current measurement based on the temperature measurement and the current signal.
A method for measuring temperature compensated current, the method comprising:
- generating a temperature measurement, by a temperature sensor in an assembly of a current transformer (CT), the temperature measurement indicative of a temperature within the housing of the CT, wherein the CT is configured to generate a current signal representative of a current in a conductor passing through a core of the CT;
- transmitting, to a trip unit, the current signal generated by the CT and the temperature measurement generated by the temperature sensor;
- and
- calculating, by the trip unit, a temperature compensated current based on the current signal and the temperature measurement.
A current transformer (CT) assembly comprising:
- a CT configured to generate a current signal representative of a current in a conductor passing through a core of the CT;
- a housing enclosing the CT;
- and
- a temperature sensor associated with the CT, the temperature sensor enclosed within the housing and configured to generate a temperature measurement indicative of a temperature of the CT.
Dependencies are inferred from the claim text.