YOU NEED NORMAL BUSINESS OPERATION WITHOUT INTERRUPTIONS?

Thursday, 16 April 2020

REASONS FOR POWER QUALITY MONITORING:

Increase of use of power electronics

• Frequency inverters
• Switching power supplies
• Non-linear loads, modern lightning, ...

Increase of unbalanced and non-linear loads like large furnaces and rectifiers

Liberalization of energy markets

• More demanding power regulation due to increase of grid connected renewable energy sources
• Reduction of infrastructure investments

 

 

 

 

 

HOW TO MEASURE POWER QUALITY?

Step 1: Measurement methods for PQ analysers

• Power Quality parameters can not be measured by standard measuring devices used for voltage/current/power… monitoring
• Only Class A Power Quality analysers  can be used for that purpose.
• Proper methodes are defined with IEC 61000-4-30 Ed.3 standard and sub-standards for harmonic analysis and flickers
• Measuring methods define principles for PQ parameters acquisition

 

HOW DO WE EVALUATE POWER QUALITY?

Step 2: Evaluation methods for issuing PQ compliance reports

• They are defined with EN 50160 standard.
• Limit lines and allowed time of non-compliance for monitored values listed in a table below are defined within this standard.
• Weekly PQ reports for determination of overall PQ compliance
• Anomaly detailed recording (waveforms, RMS trend…) is usefull for post-analysis of events

 

EXPENSES DUE TO PQ PROBLEMS

1. Generated by heavy loads connected to individual phase, damaged inverters, phase or neutral loss, power theft...
2. Consequences are

• motor operation (revolution) faults and reduction of efficiency,
• neutral line overloading,
• increasing heat of motors and power lines, shortening their lifespan,
• network losses and voltage drops

 

 

 

 

 

 

 

ISKRA PQ METERS

• MC770 – Power Quality analyser (built in Class A evaluation methods – New product!)
• MC774 – Power Quality analyser (Class A certified – IEC 6100-4-30 Ed.2)
• (i)MC784 – Advanced Power Quality analyser (Class A certified – IEC 6100-4-30 Ed.3)

 

 

 

 

 

 

 

 

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Please find more technical details about PQ issues & solutions attached.