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State of Bihar - Section

Section 12 in Bihar Electricity Regulatory Commission (Standards of Performance of Distribution Licensee) Regulations, 2006

12. Power Quality Standards.

(a)Voltage Variation: - The Licensee shall maintain voltages at the point of commencement of supply to consumer within the limits stipulated hereunder with reference to declared voltage.
(i) Low tension/Low Voltage + 6% and -6%
(ii) High tension/High Voltage + 6% and -9%, and
(iii) Extra High tension/Extra High Voltage + 10% and -12.5%
The above voltage standards are applicable subject to voltage availability at transmission-distribution interfaces within specified limit.Whenever an EHT consumer complain that abnormal voltage prevails in his premises, the distribution Licensee shall convey the complaint to the SLDC and the transmission Licensee concerned and request them to restore the voltage to normal range.
(b)Frequency variation. - The frequency variation shall be governed by the Indian Electricity Grid Code (IEGC)/State Grid Code. IEGC stipulates operating frequency range between 49.0 Hz and 50.5 Hz.The transmission utility, transmission Licensee and the State load despatch centre shall jointly maintain the operating frequency between 49.0 and 50.5 Hz. The distribution Licensee shall co-operate with the State load despatch centre and the transmission utility/transmission Licensee by reducing load whenever requisitioned.
(c)[ Harmonics: - (i) Harmonics generated by one consumer may affect the normal operation of another consumer. Therefore on receipt of a complaint from a consumer who cannot carry out normal operations due to large harmonics, the licensee shall investigate the cause and eliminate or reduce the harmonics. This may involve identification of harmonic generating consumers and serving notices on them to instalfilters. Harmonics may cause temporary over voltages and ferro-resonance. These harmonics may cause large neutral current. [Substituted by Bihar Notification No. BERC-SMP 47/2016-04, dated 23.8.2017 (w.e.f. 18.1.2007).]
(ii)The Licensee shall monitor the voltage harmonics and current harmonics in terms of "Total Harmonic Distortion" (THD), a measure of distortion of the voltage or current wave form (which shall ideally be sinusoidal) and is the square root of the sum of squares of all voltage or current harmonics expressed as a percentage of the magnitude of the fundamental.
(iii)In any installations the voltage and current Harmonic Distortion (THD) shall not exceed the limit as specified in the Central Electricity Authority (Technical Standards for connectivity to the Grid) Regulations, 2007, as amended from time to time, applicable to the Distribution Systems. The Consumer will take appropriate measures to restrict the THD to the stipulated limit.
(iv)The total harmonic distortion for voltage at the connection point shall not exceed 5% with no individual harmonic higher than 3% and the total harmonic distortion for current drawn from the transmission/sub-transmission system at the connection point shall not exceed 8%.
(v)The Licensee shall submit a quarterly report on THD of voltage and current harmonic to the Commission of following type of loads:
(a)Salient Pole synchronous generators
(b)Power Transformers of more than 15 years old
(c)Rolling Mills
(d)Induction Furnaces
(e)Welding Equipment
(f)Static Power Loads
(g)Inverters / power rectifiers
(h)Railway Traction Load
(vi)All the users operating the power generating plant in parallel with the grid shall comply with the terms and conditions of the agreement for such connectivity laid down by the Distribution Licensee. Such units shall also promptly comply with any direction that may be issued by the SLDC or the Distribution Licensee in the interest of orderly operation of the grid.
(vii)The Consumer shall not keep connected to the Distribution Licensee’s supply system any apparatus including phase splitters which in the Distribution Licensee’s opinion may interfere with or effect injuriously the Distribution Licensee’s supply to other Consumers and may disturb the supply system in short or long term.]