Power system harmonic is simply a distortions of current waveform and is mainly due to the presence of Non-linear loads like Variable speed drives, Electronic ballast, Induction furnace and UPS / Inverters / Servo stabilizers.
As per Central Electricity Authority (CEA) regulations 2007 (Technical standards for connectivity to the grid), all the existing bulk consumers (Consumers drawing power at 33 kV or above level) shall comply with the provisions of maintaining harmonics within the limit as prescribed in the latest IEEE 519-2014 standards.
Also the Central Electricity Authority has amended the (Technical Standards for Connectivity of the Distributed Generation Resources) regulations, 2013 to include the consumers of below 33 kV also to maintain the harmonics within prescribed limits.
Values of Harmonic Audit
Strictly maintain within the CEA limit to avoid penalty
To avoid excessive heat in the cables
Reduction of iron and copper losses
To improve efficiency & reduction of down time
Reduction of resonance effect in electrical network
To avoid malfunction of electronic components
Highlights of Ram Kalam
Measurements at Point of Common Coupling (PCC)
Measurements at Harmonic Generating Sources
Economic Solutions to Mitigate Harmonic Effects
Preparation of Action Plan Based on Audit Measurement
