Distribution Code (Framework).pdf
- 2. Legal framework under Electricity Act 2003 The Section 42 (1) of the Electricity Act 2003 provides that it shall be the duty of a Distribution Licensee to develop and maintain an efficient coordinated and economical distribution system in his area of supply and to supply electricity in accordance with the provisions contained in the Act and the Distribution Licensee Standards of Performance issued by the Commission. The Distribution Code ensures that the Distribution Licensee comply with the requirement of section 42 (1) of the Act read with Section 86 sub-section 1 clause (h) and (i) of the Act. 8/7/2023 2
- 3. Framework of Distribution Code 8/7/2023 3 Management of Distribution Code Distribution Planning Code Distribution System Planning & Security Standard Connectivity Conditions Operating Code Metering and Protection Code Cross boundary safety code Incident/accident reporting
- 4. Management of Distribution Code 8/7/2023 4 Distribution Code Review Panel Members of the Panel Distribution Licensee, Transmission Utility, SLDC, Generators, Open Access Consumers, Industrial, Agricultural, Domestic and Commercial Consumers & Such other member as the Commission may direct and find appropriate Commission shall develop a list of potential candidates to serve on the Distribution Code Review Panel, which reflects a balance of the various interest groups in consultation with the Distribution Licensee. Functions of the Review Panel Technical Expertise / Review and Revisions required from time to time / Scrutiny of Code / Provide guidance / Examination of the problems of Users Method of managing Distribution Code, pursuing of any changes / modifications required and the responsibilities of the Distribution Licensees and the Users/ Consumers in this regard.
- 5. Distribution Planning Code 8/7/2023 5 Planning Policy Extension or reinforcement or capacity enhancement of the Distribution System based on requirement of the User(s). Introduction of new technology DRE/EVs/BESS etc. Load data load curves database Asset mapping consumer indexing feeder metering DTR metering Load forecasting 5-year plan Peak Demand Assessment Hourly demand assessment Energy consumption assessment Use of appropriate modern forecasting tools Technical & Design Criteria Electricity usage by Consumers. Implementation of appropriate load forecast program. Energy Audit Create responsibility centers for energy audit. Develop action plan for reduction of losses. Capex investments. Suitable improvements in governance. To enable the planning, design and construction of the Distribution System for a safe and economical operation with the specified degree of reliability conforming to the following standards:
- 6. Distribution System Planning & Security Standard Quality of power supply Load forecast Planning procedure & Planning standards. Service area of a distribution network. Reliability analysis. Committee on Design, Construction & Maintenance Practices Security Standards Preventive Maintenance Maintenance Records Energy Conservation 8/7/2023 6 Specifies the guidelines for planning methodology of the Distribution System
- 7. Connectivity Conditions The design and construction of all the equipment connected to the Distribution System should be as per Indian Standard Specifications or appropriate IEC / IEEE or other International Standards. Discom is required to specify the Connection Point/ Interface Point and the supply voltage, along with the metering and protection requirements for all New Connection as per provisions of the Electricity Supply Code The operation of the Distribution System shall be in accordance with the "Distribution System Operating Standard" under Power System Management & Operation Standard as prescribed by authority under Electricity Act 2003 Connection Point/ Interface Point - Connection to Transmission System shall be governed by the relevant clauses of Central / State Grid Code as the case may be. For HT/EHT and LT Consumers connection to the Distribution System shall be as per provisions mentioned in the Electricity Supply Code. Other Procedures like Applications for Connections to The System / Acceptance or Rejection of Application for Connection / Connection Agreements shall be as per provisions mentioned in the Electricity Supply Code. 8/7/2023 7 Specify the minimum technical and design criteria, which shall be complied by any agency connected to, or seeking connection to the Distribution System
- 8. Operating Code 8/7/2023 8 Demand Estimation Outage Planning Contingency Planning Demand Side Management Interface with Small Generating Plant including CPPs Operational Communication Monitoring and Control of voltage, frequency and power factor. Safety Co-ordination. Maintenance and testing Tools and spares Human Resource Development and Training GIS or GPS based information system Procedures and practices to be followed for a safe and efficient operation of the Distribution System by the Distribution Licensee and by the Users of the Distribution System of their electrical plant and lines which are connected to the Distribution Licensee’s system.
- 9. Metering and Protection Code (1/2) 8/7/2023 9 • 66 / 33 kV bus voltage; 33 / 11 kV bus voltage; 66 / 33 / 11 kV incoming / outgoing current in each phase and each circuit. • PT currents in each phase; HT outgoing feeder current in each phase. • Power factor measurement; Load survey meters having memory duration of at least 45 days for all the incoming and outgoing feeders. • Facility to record energy in MWH and frequency at interval of 15 minutes at point of connection with Transmission Licensee. Operational Metering at Grid substation • At each point of interconnection between the Distribution and Transmission Systems in accordance with the Central / State Grid Code • At the Connection Points/ Interface Points between the User’s system and the Distribution System and shall be governed by the provision in the Distribution Services Agreement. Tariff and Commercial Metering Specifies the procedure for metering in Distribution System with respect to operational metering as well as tariff and commercial metering. This section also specifies the general guidelines for protection of Distribution system.
- 10. Metering and Protection Code (2/2) • Active & Reactive energy Import/Export • Meters shall conform to the relevant IEC or IS specifications • Main and check meters shall be provided at all Connection Points/ Interface Points. Measurement Of Energy Import/ Export • Adequate protection for all electrical equipment. • Example: Distribution System: - For Power Transformers of HV class differential protection shall be provided for rating >10 MVA along with backup time lag over current and earth fault protection with directional feature for parallel operation. Protection System • Adequate precaution against fire hazards to all apparatus in the System conforming to the relevant IS Specifications and/or provisions under other relevant rules as amended from time to time. Fire Protection 8/7/2023 10
- 11. Cross boundary safety code Nomination of Control Persons (CP) For work to be carried out by User or Discom, the CPs shall directly contact his counterpart CPs shall establish & maintain necessary precautions for carrying out the required work After work completion, the CP shall assess requirement / removal of safety precautions Discom & Users shall develop written procedure for Cross Boundary Safety Protocols 8/7/2023 11 Objective of this section is to achieve an agreement on the principles of safety when working across a control boundary between the Distribution Licensee and the Users The Distribution Licensee and all the Users (comprising Generation Companies, Transmission Licensees and consumers having load above 1MW or dedicated line) shall nominate suitably authorized and technically qualified persons to be responsible for the co-ordination of safety across their boundary. These persons shall be referred to as "Control Persons".
- 12. 8/7/2023 12 Incident/Accident Reporting Major Incident or Accident Reporting & Reporting Procedure • Discom shall send preliminary report to the Commission on all significant Incidents in the Area of Supply, which results in interruption to service / substantial damage to equipment / loss of life / significant injury to human beings. • Reporting to be done within one week of its occurrence followed by a detailed report within one month Procedure of major incident / accident reporting (which occur in Distribution System) by User to Licensee and Licensee to User and Commission REPORT: Location of the incident, Date and time, Plant or Equipment involved, Nature of incident (electrical or non-electrical), Supplies interrupted and the duration, System Parameters (Voltage, Frequency, Load, Generation) etc. …
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