US 2016/0252550 A1Published application

Asynchronous ac measurement system

AssigneeGuildline Instruments Limited

InventorsTomasz Barczyk, Petar Miljanic, Iain Page

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Abstract

Accurate measurements of electrical power at various points of a power grid is becoming more important and, at the same time, is getting more difficult as the old power distribution model of a few, large power generating stations and a multitude of relatively linear loads is replaced by a newer model containing a multitude of smaller, and to some degree unpredictable power sources, as well as a multitude of not always linear and often smart (essentially also unpredictable) loads. Embodiments of the invention provide for high accuracy voltage, current and power measurements of quasi-stationary and stationary waveforms in single and multiple phase power systems. Precision AC voltage, current, phase, power and energy measurements in power networks may be measured with current ranges from 1 mA to 20 kA and voltage ranges from 1V to 1000 kV and in a frequency range from a few hertz to one hundred kilohertz.

Claims19

Dependent claims

An asynchronous AC measurement system comprising:

an isolated current channel converter that transforms a current applied to the input by a power signal to a current within a predetermined range and digitizes said current;
an isolated voltage channel converter that transforms a voltage applied to the input by the power signal to a voltage within a predetermined range and digitizes said voltage;
and
a digital analyzer comprising at least a microprocessor that processes said digital representations of at least one of the voltage and current of the input signal to determine at least one of a parameter of the input signal and a power quality parameter of the input signal, wherein
processing said digital representations of at least one of the voltage and current of the input signal comprises:
splitting said digital representation into at least two sub-streams of a plurality of sub-streams, each sub-stream comprising a portion of the digital representation established in dependence upon a predetermined threshold;
processing each sub-stream of the plurality of sub-streams independently to establish a sub-stream output;
and
processing the plurality of sub-stream outputs to generate an output.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/154,346Filed 13 May 2016
Priority: 23 Apr 2012
Published: 1 Sep 2016
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

G01R 21/133
Arrangements for measuring electric power or power factor: by using digital technique
G01R 19/2513
Using digital measurement techniques: arrangements for monitoring electric power systems, e.g. power lines or loads; Logging
G01R 21/06
Arrangements for measuring electric power or power factor: by measuring current and voltage
G01R
Measuring electric variables

Family

Application61/636,955Us provisional application · filed 23 Apr 2012
Application13/866,433Continuation · filed 19 Apr 2013
Application15/154,346Continuation
US 2013/0282315 A1Published application
US 9,417,273 B2Related patent
US 9,709,612 B2Related patent
US 2016/0252550 A1This patent

From the US filing history. Foreign family members aren’t listed.

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