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Electrical utility meter having harmonic data templates for power quality alarm thresholds

A harmonic and data technology used in the field of multi-purpose electricity meters

Inactive Publication Date: 2006-09-20
LANDIS & GYR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, such conventional instruments do not provide any guidelines or charts, that is, any templates, against which the harmonic content of a measured signal can be compared to determine whether a device at a particular location is susceptible to electrical damage or interference

Method used

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  • Electrical utility meter having harmonic data templates for power quality alarm thresholds
  • Electrical utility meter having harmonic data templates for power quality alarm thresholds
  • Electrical utility meter having harmonic data templates for power quality alarm thresholds

Examples

Experimental program
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Embodiment Construction

[0016] Referring to the accompanying drawings, especially figure 1 , which is a schematic diagram of a typical multipurpose electricity meter suitable for practicing the invention. figure 1 Shown is an electric meter 10 and a set of polyphase power lines including a phase A power line 12 , a phase B power line 14 , a phase C power line 16 and a neutral power line 18 . A suitable meter 10 may be a transformer-adapted 9S meter type connected to a universal configuration having a four-wire wye. The electricity meter 10 includes a multiphase sensor arrangement and, in particular, sensor circuitry comprising a phase A current sensor 20, a phase B sensor 22, a phase C current sensor 24, a phase A voltage sensor 26, a phase B voltage sensor 28 and a phase A voltage sensor 28. Phase C voltage sensor 30 . The ammeter 10 includes a circuit ( figure 1 not shown, see image 3 ), the circuit generates current and voltage information from the current and voltage measured by the current ...

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PUM

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Abstract

An electrical utility meter having harmonic data templates advantageously enables a user to determine whether equipment at a particular site is susceptible to electrical damage or interference. According to an exemplary embodiment, the meter generates measured harmonic data for a plurality of phases in the polyphase electrical system. A user may select at least one of a plurality of predetermined templates including one or more harmonic data thresholds. Each of the predetermined templates corresponds to a condition where a specific device is susceptible to electrical damage or interference. The measured harmonic data is compared with the one or more harmonic data thresholds included in the at least one selected predetermined template. An alarm is generated when the measured harmonic data exceeds the one or more harmonic data thresholds included in the at least one selected predetermined template. According to a preferred embodiment, the alarm is generated in dependence upon the specific template whose one or more harmonic data thresholds are exceeded.

Description

technical field [0001] The present invention relates generally to multipurpose electricity meters, and more particularly to multipurpose electricity meters suitable for detecting power quality disturbances in polyphase power configurations. Background technique [0002] Most electric utility providers, or simply utility companies, provide polyphase and generally three-phase electricity. Polyphase power is alternating current (AC) power that is supplied on multiple power lines and the voltage waveform on each power line has a unique phase angle. Polyphase power can be supplied to users in various ways of wiring. The wiring method is specified by the number of electric wires (such as three-wire or four-wire) and the wiring relationship between phases (such as Y-shape or triangle). Generally, a single phase of polyphase power supplies only a single family home, while true polyphase power generally supplies larger equipment such as commercial and industrial equipment. [0003...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R23/20G01R21/133
CPCG01R21/133G01R23/20
Inventor P·M·格里芬
Owner LANDIS & GYR INC