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Schneider Electric Active Harmonic Flter Accusine PCS+ Solution
ACTIVE HARMONIC FILTER ACCUSINE PCS+
WHAT IS POWER QUALITY?
Power quality is any problem related to voltage, current, or frequency that causes the electrical equipment not to work properly or even be damaged.
POWER QUALITY = VOLTAGE QUALITY?
The standards for power quality are actually built on the basis of ensuring voltage within a specified level.
However, there is always a close relationship between voltage and current. The voltages generated by sources are almost always sinusoidal, but the currents through different loads will be different, and this in turn will have an opposite effect on the supply voltage. For example:
- Short circuit currents cause voltage drops, or equal to zero.
- Lightning surge currents create very high voltage spikes that cause flashover, and can lead to short circuits.
- Distorted currents due to nonlinear loads distort the voltage. This distorted (non-sinusoidal) voltage affects other consumers.
Therefore, although voltage is the quantity of ultimate concern, in practice, currents must be considered when addressing power quality issues.
Power quality issues are defined in IEEE 1159 standard
Which, the issue of harmonics is of particular concern because in the current period, power electronic devices such as inverters are widely used, and customer requirements for power quality are also more stringent, especially for important production lines and ports in factories.
WHAT ARE HARMONICS?
- Harmonics are the total waveform of oscillations in multiples of the fundamental frequency (50Hz)
- This waveform will be distorted compared to the original pure sine wave.
- When harmonic current flows through the impedance of the power system (system impedances), it will create voltage harmonics. From there, distorting the source voltage waveform
THE IMPACT OF HARMONICS ON THE ELECTRICAL SYSTEM
STANDARDS AND REGULATIONS OF THE ELECTRICITY INDUSTRY ON HARMONICS
OTECH applies the IEEE 519 standard for harmonic testing
Regulations on THDv voltage harmonic level according to the voltage level (For example THDv regulation level for low voltage level is < 8%)
OTECH applies Circular 30/2019 of the Ministry of Industry and Trade (updated from Circular 39/2015) for harmonic assessment
Thus, at low voltage level, the required voltage harmonic level must be < 8% and the current harmonic level must be < 12% for systems with capacity ≥ 50kW
METHOD OF MEASUREMENT & HARMONIC ASSESSMENT METHOD
Currently, to deploy harmonic assessment services, OTECH’s engineering team applies IEEE 519 standard and Circular 30/2019 for measurement and assessment using specialized measuring equipment according to EC61000-4-7 & IEC61000-4-30 standards such as Fluke 435 or through Schneider Electric’s Power Monitoring Expert – PME software
Measurement with Fluke 435
Harmonic measurement method:
1. Very short time measurement
Continuous measurement within 24 hours, sampling time: every 3 seconds
2. Short time measurement
Continuous measurement within 7 days, sampling time: every 10 minutes
3. Measurement result evaluation method
- Evaluate results based on the 99% rule with measurement results within 24 hours
- Evaluate results based on the 95% rule with measurement results within 7 days
- Using PME software – Schneider Electric to monitor and export reports
HARMONIC FILTERING SOLUTIONS – ACTIVE HARMONIC FILTER ACCUSINE PCS+ FROM SCHNEIDER ELECTRIC
OTECH Joint Stock Company is certified as EcoXpert by Schneider Electric Vietnam for harmonic filtering solutions using Active Harmonic Filter AccuSine PCS+
With many years of experience in providing services and solutions for electrical systems as well as power quality solutions, OTECH is a pioneer in providing harmonic filtering solutions for factories with the cooperation of Schneider Electric
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For more information about the active harmonic filter Accusine PCS+ solution, please contact us through the information below:
OTECH JOINT STOCK COMPANY
- Hotline: 1800 9472
- Phone number: (+84) 28 6686 3565
- Email: service@otech.com.vn
- Address: 02 Street 15, Van Phuc 1 Residential Area, Hiep Binh Phuoc Ward, Thu Duc City, Ho Chi Minh City, Vietnam.
References: Schneider Electric, Ho Chi Minh City University of Technology – HCMUT
