US 12,339,302 B2
Apparatus and method for measuring active electric power in an electric circuit
Artur Zawadzki, Cracow (PL); Grzegorz Molinski, Cracow (PL); and Piotr Ryba, Humniska (PL)
Assigned to ABB Schweiz AG, Baden (CH)
Filed by ABB Schweiz AG, Baden (CH)
Filed on Mar. 6, 2023, as Appl. No. 18/178,678.
Claims priority of application No. 22160670 (EP), filed on Mar. 8, 2022.
Prior Publication US 2023/0288460 A1, Sep. 14, 2023
Int. Cl. G01R 21/06 (2006.01); G01R 21/133 (2006.01)
CPC G01R 21/06 (2013.01) [G01R 21/133 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A measuring apparatus for measuring active electric power in an electric circuit, said measuring apparatus comprising:
a first measuring unit operatively coupled to a first measurement point of said electric circuit, said first measuring unit configured to acquire first detection values (v(t)) related to one or more voltages at the first measurement point of said electric circuit; and
a plurality of second measuring units operatively coupled to a plurality of second measurement points of said electric circuit, each second measuring unit of the plurality of second measuring units configured to acquire second detection values (i(t)) related to one or more currents at a corresponding second measurement point of said electric circuit,
wherein said first measuring unit and said second measuring units are capable of communicating one with another,
wherein said first measuring unit is configured to transmit in a cyclical manner, with a predefined broadcasting frequency and during subsequent measurement intervals (TJ), broadcast messages (MB) to said second measuring units, each broadcast message (MB) including the first detection values (v(t)) acquired by said first measuring unit,
wherein each second measuring unit is configured to receive, during each measurement interval (TJ), a broadcast message (MB,J) of the broadcast messages (MB) transmitted by said first measuring unit that includes first detection values (v(t)) acquired by said first measuring unit at an acquisition instant (tK) preceding said measurement interval (TJ),
wherein each second measuring unit is configured to calculate, during said measurement interval (TJ), in response to receiving said broadcast message (MB,J), third detection values (P(t)) indicative of active electric power flowing through the corresponding second measurement point of said electric circuit,
wherein each second measuring unit is configured to calculate said third detection values (P(t)) at a calculation instant (tC) included in said measurement interval (TJ) and delayed by a predefined latency time (TL) relative to the acquisition instant (tK) of the first detection values (v(t)) included in the received broadcast message (MB,J),
wherein each second measuring unit is configured to calculate said third detection values (P(t)) based on the first detection values (v(t)) received by said second measuring unit up to said calculation instant (tC) and based on the second detection values (i(t)) acquired by said second measuring unit up to the acquisition instant (tK) of the first detection values (v(t)) included in the received broadcast message (MB,J), and
wherein each second measuring unit is configured to calculate the acquisition instant (tK) of the first detection values (v(t)) included in the received broadcast message (MB,J) based on said calculation instant (tC) and said predefined latency time (TL).