Distribution Code Overview

The Distribution Code contains procedures for the management of day to day technical situations on the Distribution Networks, considering a wide range of operational conditions likely to be encountered under both normal and abnormal conditions.

Distribution Code Overview

Distribution Code comprises 5 parts and appendices as depicted in the above diagram

Part 1: General Conditions (GC)

Part 1 comprises 5 sections which are listed below. Some of the topics discussed in this part are “Role of The Distribution Companies”, “Definitions, Interpretation, Derogations, Data and Notices, Distribution Code Review Panel, Distribution Code Disputes and Conditions Precedent”.It comprises 4 sections (Sections 1 to 4) listed below..

Section 1: Background.
Section 2: Purpose and Scope.
Section 3: Interpretation.
Section 4: Review Process and Code Disputes.
Section 5: Effectiveness and Conditions Precedent

Part 2: Distribution, Planning and Connection Code (DPCC)

Part 2 has 4 sections which are listed below. A few of the topics covered are “Scope”, “Distribution Planning Responsibility”, “Submission, Consolidation and Maintenance of Planning Data”, “Load Forecast”, “Distribution Planning”, “System Studies”, “Processing of Applications”, “Connection Agreements”, “Commissioning of Equipment and Physical Connection to the Distribution”, “Supply Quality Standards”, “Frequency Variations”, “Voltage Levels”, “Harmonics and Flicker”, “Protection of the Distribution System”, “Equipment Short Circuit Rating”, “Equipment And Maintenance Standards”,and “Under Frequency Relays for Automatic Load Shedding”. .

Section 1: Purpose and Scope.
Section 2: Distribution Planning Procedures.
Section 3: Procedures for Connection or Modification.
Section 4: Technical Requirements at The Connection Point.

Part 3: Distribution Operating Code (DOC)

Part 3 is the longest and it is divided into 7 sections listed below. Among the topics discussed are “Users Required Information to Discos”, “Maintenance Plans”, “Demand Estimation”, “Outage Planning”, “Demand Management and Load Shedding”, “Supervisory Control and Data Acquisition (SCADA)”, “Incident Reporting Procedure”, “Training”, “Preliminary Notice and Establishment of Test Panel”, “Final Test Programme”, “Record of Network Safety Precautions (RNSP)”, “Safety Precautions on High Voltage Equipment”, “Safety Precautions on High Voltage Equipment:, “Emergency Situations” and “Loss of Integrity of Safety Precautions”. .

Section 1: Purpose and Scope.
Section 2: Operational Planning.
Section 3: System Operation.
Section 4: Reliability Analysis.
Section 5: System Tests.
Section 6: Safety Co−ordination
Section 7: Numbering and Nomenclature of Electrical Apparatus at Ownership Boundaries.

Part 4: Distribution Construction and Maintenance (DCM)

Distribution Construction and Maintenance procedure is discussed in Part 4 which has only one section. Among the issues mentioned in this part are “Construction Practice”, “Maintenance” and “Off−Schedule Inspections”.

Section 1: Distribution System Construction, and Maintenance.

Part 5: Data Registration Code (DRC)

There is only one section in part 5. Some of the topics discussed are “Data Categories”, “Standard Planning Data (SPD)”, “Detailed Planning Data (DPD)” and “Procedures and Responsibilities”.

Section 1: Data Registration

Appendices

There are 4 appendices though some of them are divided into two or more sub appendices. The list includes the following:

Appendix 1: Definitions
Appendix 2a: Data For Directly Connected Power Stations
Appendix 2b: Generation Set Data for All Directly Connected Generating Units
Appendix 2c(i): Directly Connected Synchronous Generation Units
2c (ii): Generation Set Data for Directly Connected Generator
Appendix 2 C (Ii): Data Description
Appendix 2c (Iii): Generating Set Data for Directly Connected
Appendix 2c iIv): Generation Set Data for Directly Connected Generator
Appendix 2c (v): Disco’s Network Data
Appendix 2d (i): Demand Forecasts – Long Term
Appendix 2 D (ii): Operational Planning: Medium Term 1-2 Years
Appendix 2e: Operational Planning User Plant and Apparatus
Appendix 2f: System Design Information
Appendix 2g: Load Characteristics
Appendix 3: Civil Emergencies
Appendix 4: Record of Network Safety Precautions

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