Wye service power meter
AssigneeSchlumberger Industries
InventorCoy Stephen Lowe
Life of this patent
Estimating the term…
Abstract
A device for monitoring power in a wye power service having three phases includes a sampling element arranged and configured to sample a current value and a voltage value from each of the three phases. A processor, coupled to said sampling element, calculates power either (i) by using the current value and the voltage value for the at least one phase when the voltage value for the at least one phase is available, or (ii) by using the current value for the at least one phase and the voltage values for the other two phases if the voltage value for the at least one phase is unavailable.
Claims14
A device for monitoring power in a wye power service having three phases, said device comprising:
- a sampling element arranged and configured to sample a current value and a voltage value from each of the three phases;
- and
- a processor, coupled to said sampling element, to calculate power (i) by using the current value and the voltage value for the at least one phase when the voltage value for the at least one phase is available, and (ii) by using the current value for the at least one phase and the voltage values for the other two phases if the voltage value for the at least one phase is unavailable.
A method of monitoring power in a power service having three phases, said method comprising:
- measuring current values for each phase of the power service;
- measuring voltage values for each available phase of the power service;
- calculating power for at least one phase of the service in one of the following two calculation methods:
- (i) by using the measured current and the measured voltage for the at least one phase when the measured voltage is available for the at least one phase;
- and (ii) by using the measured current for the at least one phase and the measured voltages for the other two phases when the measured voltage is unavailable for the at least one phase.
A device for monitoring power in a wye power service having three phases, said device comprising:
- sampling means for sampling a current value and a voltage value from each of the three phases;
- and
- calculation means, coupled to said sampling means, for calculating power (i) by using the current value and the voltage value for the at least one phase when the voltage value for the at least one phase is available, and (ii) by using the current value for the at least one phase and the voltage values for the other two phases if the voltage value for the at least one phase is unavailable.
Dependencies are inferred from the claim text.