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1 · 1 SHORT TITLES, COMMENCEMENT, EXTENT AND INTERPRETATION:

1 · 2 DEFINITIONS

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13 · ABBREVIATIONS:

1 · 4 INTRODUCTION:

15 · OBJECTIVES:

1 · 6 APPLICABILITY:

1 · 7 IMPLEMENTATION:

1 · The distribution licensee shall be responsible for the implementation of the Distribution code 2. Nothing contained in this Code should be interpreted as imposing obligations duties on Consumers Distribution Licensees greater or more onerous than those mentioned in the Electricity Act; 2003 under relevant clauses.

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1 · 10 PROCEDURES TO SETTLE DISPUTES:

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1 · A standing body (Distribution Code Review Panel) shall be constituted by Commission comprising of the representatives of Distribution Licensee as well as the Users of the Distribution System in line with the provisions of Distribution Code.

2 · The chairperson and members except the secretary shall be part time members of the panel. The review panel shall generally consist of the following members and having knowledge and practical experience of technical matters related to electricity supply by utilities. Commission shall nominate the chairperson and secretary of the Distribution Code Review Panel 0n rotation basis from among the members of the Distribution Licensees, but at no point of time the chairperson and secretary shall belong to the same Distribution Licensee The secretary shall be a full time member of the review Panel. The members of the review panel shall be as follows: One senior technical officer from each Distribution Licensee not below the rank of Executive Engineer: One Member from Transmission Utility o SLDC One Member from Transmission Licensee to represent all Transmission Licensees. After the tenure over, such Member, the representative of a different Transmission Licensee will be a member of review panel. One Member from among Embedded Generator Captive Power Plants, CO- generation units, conventional and non-conventional generating units, to represent all such users in State of Goal UT's. Open Access Customers connected to Distribution Systems. Such other member as the Commission may direct and find appropriate. Commission shall develop 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. 3_ The members of the Review Panel shall normally have tenure of two years unless he ceases for any reason to be member of the Review Panel. Chairperson of the

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2 · The requirement of the Users may necessitate extension or reinforcement of the Distribution System: In some cases the same may even require the Distribution Licensee to seek the extension or reinforcement to the capacity of the Transmission System at the Connection Point/ Interface Point: This may arise for a number of reasons mentioned below, but not limited to the same:

1 · The Distribution Licensee shall develop load curves for the area fed by the concerned substation of the Transmission Licensee from the metering data available at the Connection Point/ Interface Point. Such data shall be compiled for the entire Area of Supply combining the load curves of each substation feeding its Distribution System: The Distribution Licensees shall collect data and map the power factor of network (feeder wise as well as consumer category wise by installing meters 0n typical distribution transformers.)

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2 · The actual energy drawn by the Distribution System as recorded in the energy meters installed at Connection Points Interface Points shall be reconciled with the actual energy sales in overall Area of Supply. The aggregate distribution losses computed from these data shall be furnished to the Commission every quarter:

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3 · The projections shall take into account the assumed normal growth for non-specific loads, specific and identified loads of 1 MW and above, and the effects of demand side management, if any, and energy conservation.

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12 · The planning of the Distribution System shall always keep in view the cost effectiveness and reduction in energy losses without sacrificing the requirements of Security Standards and Safety Standards for the Distribution System.

13 · The Distribution Licensee shall plan the Distribution System expansion and reinforcement keeping the following in view along with all other measures to accommodate the advancement in technology prevailing at the time: (a) Economic ratio 0f HT and LT line lengths, (b) Use of aerial bunched conductors; Underground cables, Optimizing the number of distribution transformers and their location at the electrical load centers.

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2 · The Distribution Licensee shall carry out energy audit of his total system compiling the data and analysis carried out in each responsibility centre in the best possible manner: The energy received from each substation shall be measured at the 11 KV terminal switchgear of all the outgoing feeders installed with appropriate energy meters such that the energy supplied to the each feeder is accurately available. It shall be compared with the corresponding figures of monthly energy sales and the distribution loss for each feeder shall be worked out. In case the Distribution Licensee has adopted ring main system at IKV and there is difficulty in determining the distribution losses for each feeder; then the Distribution Licensee shall work out distribution losses for the overall Area of Supply.

3 · An action plan for reduction of losses with adequate investments and suitable improvements in governance shall be drawn up and shall be submitted to the Commission Annually

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1 · The design and construction of all the equipment connected to the Distribution System shall satisfy the relevant Indian Standard Specifications. In case of equipment for which the Indian Standard Specifications do not exist; the appropriate IEC, or IEEE Or other International Standards shall apply.

3 · For every new connection sought, the Distribution Licensee shall specify the Connection Point/ Interface Point and the supply voltage, along with the metering

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5 · The insulation co-ordination of the Users' equipment shall conform to the applicable Indian Standards/Code of practices The rupturing capacity of the switchgear shall not be less than that notified by the Distribution Licensee.

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1 · Connection to Transmission System shall be governed by the relevant clauses of Central State Grid Code as the case may be.

3 · . EHTMHT Consumers: The supply voltage may be 220kV, 132kV, 66kV, 33 kV, 22 kV or 11 kV or voltage as agreed by the Distribution Licensee The substations shall be owned by the Users. The boundary shall be the feeder entry in the premises of the Users 0r when so provided it shall be the busbar between breakers of the Distribution Licensee and the EHT/ HT Consumers_

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1 · This Chapter contains the 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. This shall also apply to any electrical interface between two Distribution Licensee's for safe and efficient operation of interface.

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1 · The Distribution Licensee shall estimate his hourly and daily Demand for his Area of Supply on the basis of relevant load curves drawn on day ahead basis subject to modifications depending upon the communication received from any specific User or caused by any contingency. This may be given to SLDC as may be required.

2 · For this purpose, the concerned major Users identified by the Distribution Licensee shall furnish the required data pertaining to their demands of their installation to him.

1 · The Distribution Licensee shall furnish his proposed outage programs to the SLDC on a month ahead basis.

2 · The outage program shall contain identification of lines and equipment of the Distribution System proposed by Licensee.

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1 · A contingency situation may arise in the event of a total or partial blackout in the Transmission System. A contingency may also arise o part of the Distribution System due to local breakdowns in the Distribution System itself: It may also arise due to a breakdown in the Apparatus of the Transmission Licensee at the point of interconnection_

2 · Transmission System Failure:

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4 · Failure of the Apparatus of the Transmission Licensee:

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13 · Temporary Load Shedding may be resorted to for maintaining the load generation balance as instructed by the SLDC. This may also be necessary due to loss of any circuit Or equipment Or any other operational contingency.

3 · If the duration of unplanned load shedding to any part of the Distribution System exceeds 60 minutes, the affected Consumers having contract demand of IMW and above may be suitably intimated. The essential services such as public hospital, public water works, sewage works; etc. shall be intimated over the telephone wherever possible. 5.6 INTERFACES WITH SMALL GENERATING UNITS INCLUDING CPPS

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2 · The Distribution Licensee shall take power factor improvement measures at strategic points in the Distribution System by carrying out system studies and installing the required reactive compensation equipment.

4 · Users having loads with high harmonic content; low Power Factor and fluctuations shall install appropriate correction equipment

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5 · The Distribution Licensee shall abide by the instructions issued by the SLDC from time to time on load management for maintaining the frequency of supply within the specified limits.

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2 · The Distribution Licensee and such Users shall prepare safety manuals incorporating all the safety precautions to be taken for each component of the Distribution System. AlL the safety rules and precautions shall be observed when work is to be carried out on any line or apparatus, switchgear or circuits in any part of the Distribution System or in any part of the User System. The safety manuals thus prepared shall be issued to all the control persons and such Users for compliance.

4 · The provisions of the (State Central) Grid Code Regulation (as the case may be_ shall be followed at Connection Points/ Interface Points in co-ordination with the Transmission Licensee.

5 · The disconnecting device(s) at each electrical interface, which shall be capable of effectively disconnecting the system of the Distribution Licensee and the other Users, and the grounding devices of the respective systems at the control boundary shall be identified and marked by the Licensee and the respective Users These shall be maintained in good condition at all times. To prevent inadvertent switching operations by unauthorized persons, such disconnecting devices shall be provided with interlocks. 6 Wherever any Consumer has installed an emergency power supply system;, either an electronic system with storage batteries or with generators, the arrangement shall be such that the same cannot be operated without clearly isolating the system from the supply mains. The responsibility of making the required arrangement for isolation from supply mains shall be of the User and this shall be part of the electrical layout submitted to Electrical Inspector for his approval The possibility of feedback from these devices to the Distribution System from any of the conductors, including the neutral conductor shall be clearly ruled out:

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8 · The Distribution Licensee in consultation with the concerned User shall frame checklist of operations to be carried out and the procedures for safety coordination for each electrical interface, before issue and return of PTWs. Such procedures and checklists shall be issued to all the concerned by the Licensee for implementation.

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1 · The Distribution Licensee shall prepare maintenance schedules for lines and equipment to meet the level of maintenance as required in the "Distribution System under Power System Management and Operating Standard" and "Distribution System under Power System Safety Standard

2 · Regular testing of all the equipments, such as transformers, switchgear, protective relays etc , should be carried out as recommended by the manufacturers and the relevant code of practices issued by the Bureau of Indian Standards and CBIP . These shall be carried out at the prescribed intervals and the test results shall be recorded in the maintenance registers. Wherever the test results indicate decline in the insulation resistance and/or deterioration of the equipment, preventive maintenance shall be carried out to ensure serviceability, safety and efficiency.

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66 · 33 kV bus voltage 33 22 11kV bus voltage 66 33 22 11 kV incoming outgoing current in each phase and each circuit Power transformer primary and secondary currents in each phase of every transformer. HT outgoing feeder current in each phase for each feeder: Power factor in each HT feeder: 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.

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1 · Tariff metering shall be provided at each point of interconnection between the Distribution and Transmission Systems in accordance with the Central State Grid Code as the case may be and the Transmission Services Agreement thereof.

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2 · Tariff metering shall be provided 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. 3 . AIL the meters, instrument transformers (CT/PT), metering cubicles ad testing procedures shall conform to the relevant Indian Standard Specification and relevant provision made under the Electricity Act; 2003.

5 · The open access consumer, Generating company, Distribution licensee and traders shall provide Meters, as may be specified by the Commission for such consumer based on voltage, point and period of supply and tariff category (as also incorporated in JERC (State Grid Code) Regulations 2010).

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1 · The Distribution Licensees shall install the following meters for all of their sub- transmission lines connecting the generating stations, and substations for the measurement of energy import/export from each Connection Point/ Interface Point; energy generated in generating units and energy consumed in power stations and substations:

2 · All the instrument transformers used in conjunction with commercial (tariff) metering shall also be of accuracy class 0.2 and conform to the relevant IEC or IS specifications The rating shall be suitable for catering the burdens of lead wires and metering: However; in case of rating of instrument transformers in service,

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4 · Voltage failure relays shall be provided to initiate alarm on loss of one or more phases f the voltage supply to the meter:

7 · . The Generating Companies, Transmission Licensees and Distribution Licensees shall formulate and agree upon procedure covering summation, collection and processing of tariff meter readings at various interconnection sites of their area. Whenever necessary, these procedures can be revised.

9 · The term 'Meter' shall include Current transformers, voltagelpotential transformers, wiring between them and meter box/panel.

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1 · No item of electrical equipment shall be allowed to remain connected to the system unless it is covered by the appropriate protection aimed at reliability, selectivity, speed and sensitivity. The Distribution Licensees shall cooperate with the Transmission Licensee to ensure correct and appropriate settings of protection to achieve effective, discriminatory isolation of faulty linelequipment within the time target clearance specified by the Transmission Licensee.

2 · Protection settings shall not be altered, Or protection bypassed and/or disconnected without consultation and agreement of all the affected Users. In case the protection has been bypassed and/or disconnected by agreement due to any cause, the same should be rectified and protection restored to normal condition as quickly as possible. If agreement has not been reached, the electrical equipments shall be isolated forthwith

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7 · . Distribution lines: All the 33 kV, 22 kV and 11 kV lines at Connection Points Interface Points shall be provided with a minimum of over current and earth fault relays as follows: Plain radial feeders: Non-directional time lag over current and earth fault relays with suitable settings to obtain discrimination between adjacent relay settings. b Parallel/ring feeders: Directional time lag over current and earth fault relay.

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1 · The Distribution Licensee shall issue a list of Control Persons with their names, designations, addresses and telephone numbers, to all the Users having direct control boundary with him: This list shall be updated promptly whenever there is any change of name, designation or telephone number of any Control Person named in the list.

2 · All the Users such as mentioned in 8.3.1 having a direct control boundary with the Distribution Licensee shall issue similar list of their Control Persons to the Licensee. This list shall be updated promptly whenever there is any change of name, designation or telephone number of any Control Person named in the list.

4 · If the work extends beyond one shift, the Control Person shall hand over charge to

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7 · . After the completion of the work, the Control Person in charge of the work being carried out should satisfy himself that the safety precautions taken are no longer required, and shall make direct contact with his counterpart Control Person and request removal of the safety precautions. The equipment shall be declared as suitable for return to service oly after confirmation of removal of all the safety precautions, by direct communication, using the code word contact between the two Control Persons, and the return of agreed safety documentation from the working party.

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1 · The Distribution Licensee shall send a preliminary report to Commission all the significant Incidents in the Licensee's Area of Supply, which results in interruption to service, substantial damage to equipment O loss of life O significant injury to human beings within one week of its occurrence followed by detailed report within one month. 2 The Distribution Licensee and the Users shall establish a format and procedure for exchange of information. 3_ The Users shall furnish information to the Distribution Licensee regarding any major incident occurring in their Systems promptly.

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1 · Frequency: The rated frequency shall be 50 Hz. All the constituents of the Power System shall make all possible efforts to ensure that the grid frequency remains within the bandwidth of 49.0 -50.5 Hz. 2_ Voltage: The voltage at any point of the system under normal operating conditions shall not depart from the declared voltage by more than the values specified under IS Specification: 3 Harmonic content: As per IEEE recommendations, the total harmonic content in the supply voltage for sensitive loads shall not exceed 5 percent, with any single harmonic content not exceeding 3 percent: The respective User responsible for generating harmonics and affect the distribution system shall be responsible for corrective action:

2 · Preliminary Load Estimation/Assessment:

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3 · Non-industrial Bulk Supply: The available data regarding the consumption of bulk supply to non-industrial Consumers such as research establishments, port trusts, military engineering services, supply to power projects etc. and the probable future developments in these areas, shall be considered for the forecast:

4 · Other Loads: For other loads, the projections shall be based on the best Judgment:

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6 · 1 Standardization of Sizes and Ratings: Adequate provision for future load development shall be made while selecting the sizes of power conductors and rating of distribution transformers. The sizes of power conductors, insulators, lightning arresters, transformers, switchgear, etc. used in the Distribution System shall be standardized with the objective of reducing inventory and standard specifications shall be prepared.

1 · Radial system of distribution can be adopted in rural areas and as far as possible loop system with provision for feeding from at least one alternate source shall be adopted in urban areas_ 2_ The HT and LT distribution lines shall be any of the following types according to the necessity at the required area. Over-head line with bare conductors; Over-head line with Aerial Bunched Cables; Under-ground Cables

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6 · 2 Standardisation of Design and Rating of Distribution Transformers

1 · . The design and rating of distribution transformers shall be standardised: As an initial step, the various technical parameters required for the design shall be incorporated in the specifications based on the experience on performance gained among the various designs so far adopted. Later, standard designs of the transformers and their detailed construction drawings shall be evolved based on the performance of these transformers. These shall be adopted for future procurement: This also ensures the inter-changeability of components of similar transformers manufactured by any manufacturer: 2 A good quality assurance plan shall be aimed at the following:

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6 · 3 Standardisation of Sub-Station Layouts

6 · 4 Reactive Compensation

1 · Shunt capacitors un-switched/switched type, shall be installed at the appropriate places in the Distribution System for power factor improvement; maintaining satisfactory voltage profile and reduction of sub-transmission and Distribution losses. The size and location of the capacitor installations shall be determined using an appropriate program with reliable field data Suitable precautionary measures; such as automatic switching etc shall be adopted to avoid over voltages at light load periods.

2 · Optimization studies of shunt compensation shall be conducted by the Distribution Licensee to determine the most appropriate Sizes and locations for shunt capacitor installations.

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6 · 6 Service Mains

6 · 7 Metering Cubicles

1 · . The metering for 230 V single-phase supply shall be provided on suitable board, located in such place protected from sun and rain and shall be in convenient position for taking readings The terminals of the meter shall be made tamper-proof and sealed. For 400 Volts three phase supply, the meters and associated metering equipment including connections shall be enclosed in suitable tamper-proof box. The tamper-proof box shall be of sufficient strength and design with locking and sealing devices and shall have adequate provision for heat dissipation with the required electrical clearances The design shall permit readings to be taken without access to the meter or its connections

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1 · Standing Committee for design, construction and maintenance practices shall under the chairmanship of the technical Member/Director of the licensee be constituted by the licensee, within one month w.e.f: the commencement of this Code and shall comprise of-

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1 · The Distribution System shall be planned and maintained so as to fulfill the following security standards except under Force Majeure conditions beyond the reasonable control of the Distribution Licensee. 2_ The feeders, either HT or LT, feeding important loads such as hospitals, crematoria, airports, railway stations, and the like shall be planned to have selective switching system, SO that selective switching can be operated to transfer the load on to an alternate healthy feeder: Appropriate safety precautions shall invariably be taken in this regard. In case of failure of the feeder; these switches shall be operated immediately either manually or automatically depending on the importance of the load.

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1 · The licensee and the User shall prepare Preventative Maintenance Schedule and Inspection Manual for various line and sub-station equipment installed in distribution system. 2_ The Preventive Maintenance Schedule and Inspection Manual shall cover the following: - Recommended Schedule for inspection; b Recommended Schedule for preventive maintenance; and Recommended Schedule for overhauling: 3. The inspection schedule and preventive maintenance schedule shall have daily, weekly, monthly, quarterly and annual periodic activity, to be carried out for various equipment.

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3 · In the agriculture sector the licensee shall promote the pump sets and the water delivery system engineered for high efficiency: In the industrial sector; the licensee shall take action for promoting energy efficient technologies as energy conservation measures_ Motors and drive system are the major source of high consumption in agricultural and industrial sector. The licensee shall encourage that the consumers use high efficiency motors in agricultural and industrial sector: The licensee shall take effective steps so that energy efficient lighting technologies are adopted in industries, commercial and domestic establishments.

1 · Type of Load: (E.g: Furnace loads, rolling mills, traction loads, pumping loads, industrial loads etc.) 2 Maximum Demand (KVA)

5 · Rated voltage, frequency and number of phases at which supply is required:

6 · Description of equipment: a) Motors: (State the purpose and number of installations, voltage and KW rating; method of starting, starting current and duration; type of motors, types of drives and control equipments etc)

7 · . Sensitivity of Demand to fluctuations in voltage and frequency of supply at the time of peak load: (Give details). 8_ Phase unbalance imposed on the System: Maximum: Average:

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9 · Maximum harmonic content imposed on the System: (Furnish details of devices proposed for the suppression ofharmonics) 10. Details of the loads likely to cause demand fluctuations greater than 10 MW at the point of connection including voltage dips (percentage) lasting for 5 seconds Or more: EMBEDDED GENERATOR UNIT-WISE DATA

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5 · Details of Grid substations at the point of interconnections as follows:

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