TNERC Proposes Draft Amendments To Enhance Power Quality And Reliability In Tamil Nadu

The Tamil Nadu Electricity Regulatory Commission (TNERC) has published draft amendments to the Tamil Nadu Electricity Supply Code. This proposal aims to update existing regulations, incorporating recent changes in standards and practices. Public comments on these amendments are invited until July 15, 2024.

One significant change is in the regulation of current harmonic control. The amendments propose a revised heading for this regulation, specifying that it now applies to loads of high-tension (HT) and extra high-tension (EHT) services and charging stations at all voltage levels. This adjustment aligns with the Central Electricity Authority (CEA) Amendment Regulations 2019 and the IEEE Standard 519-2022.

The draft also details new requirements for harmonic control in generation resources, such as wind generating stations, inverter-based resources, and distributed energy resources. According to the updated IEEE Standard 519-2022, specific current distortion limits and measurement points are defined for these resources. Instruments used for harmonic measurement must comply with IEC standards.

For new supply connections, applicants must submit a self-declaration confirming the installation of adequate harmonic filters. Measurements of current distortion must be taken within three months of supply activation. If distortion exceeds limits, actions outlined in the amendments, including potential disconnection, will be followed.

The amendments emphasize that all generation resources, including those using inverters, wind-solar hybrid systems, and energy storage systems, must adhere to these updated standards. The regulation aims to maintain harmonic current distortion within prescribed limits, ensuring quality power supply to consumers.

Furthermore, the draft introduces specific procedures for the restoration of electricity supply. If a service connection has been disconnected for over six months due to non-payment, consumers may now reconnect by paying 40% of the outstanding dues upfront and the remaining 60% in ten monthly installments. This provision ensures a structured and manageable approach for consumers to regain electricity supply while addressing outstanding payments.

The TNERC has also proposed amendments to address cases where existing service connections do not conform to new regulations. These amendments allow for mutual consent between the distribution licensee and the consumer to adjust the service connection’s voltage, considering the capacities of existing infrastructure and a cost-benefit analysis.

Additionally, the TNERC’s proposal includes a detailed explanation of terms such as maximum demand load current and short-circuit ratio, providing clarity on how these values should be calculated and applied in practice. This ensures that both new and existing installations maintain compliance with the latest standards, promoting consistency and reliability across the electricity supply network.

The proposed amendments also outline the penalties for exceeding harmonic current distortion limits. Penalties will be levied progressively, depending on the extent of the excess distortion. Consumers are given a six-month period to install necessary filters to reduce distortion. Failure to comply will result in a disconnection notice, emphasizing the importance of adhering to these regulations to avoid service disruptions.

The TNERC’s draft amendments to the Tamil Nadu Electricity Supply Code are a comprehensive update aimed at enhancing power quality and reliability. By aligning with the latest standards and providing clear guidelines for compliance, these amendments are poised to benefit consumers and ensure a robust and efficient electricity supply system in Tamil Nadu. Public feedback is crucial in finalizing these amendments, and stakeholders are encouraged to submit their comments and suggestions by the specified deadline.

Please view the document here for more details.