electrieal power trasmission

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Presentation Transcript

TRANING REPORT:

TRANING REPORT TRASMISSION & DETIBUTION IN 220KV/66KV/33KV/11KV

DTL Sub-station:

DTL Sub-station My training report is related with a 220 KV GRID SUB-STATION which is located Okhla Phase-II, New Delhi – 110020 Delhi Transco Limited an undertaking of NCT Delhi Govt. In such a substation The assembly of apparatus used to change some characteristic of electric supply is called a Sub-Station.

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Sub-stations are important part of power system. The continuity of supply depends to a considerable extent upon the successful operation of sub-stations. The following are the important points which must be kept in view while laying out a sub-station:

Introduction of Sub-station:

Introduction of Sub-station The present day electric power is generated, transmitted & distributed in the form of alternating current. The electric power is produced at generating station which one located at voufarable place, generally quite away from the consumers place.

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The power is delivered to the consumers through a large network of transmission and distribution. it may desirable and necessary to change some characteristic of electric supply which accomplished by suitable apparatus called sub-station.

Plant Description:

Plant Description

Role of a DTL , okhla:

Role of a DTL , okhla The role of Delhi Transco Limited is confined to arrange and provide transmission network of 400 KV and 220 KV source from Northern Grig. The present infrastructure for this purpose under 400 KV system is 4,725 MVA (2520 MVA with DTL and 2205 with Power Grid Corporation). As against this, 220 KV sub Stations have the capacity of 6,300 MVA is available for Delhi.

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The source of incoming 220kv in DTL from NTPC badarpur ,new Delhi. It covers almost 70% load requirement of south Delhi The DTL of okhla only four yare of transmission. 220kv,66kv,33kv,11kv. We are showing figure

The 200KV yard:

The 200KV yard

220kv:

220kv Total no of bays =9 No of transformer 100MVA = I,II, III & IV No of transformer 50MVA = I & II Bus Coupler = 01 2-Incomer = BTPS I & II

THE 66KV YARD:

THE 66KV YARD

66kv:

66kv Total no of bays =13 2- Incomers – I & II 2-outgoing feeders to 20MVA-I & II-66/11 5-outgoing feeders- Okhla Phase = I & II Malviya Nagar = I , II & III 3-Bank = I, II & III 1-Bus Coupler = 01

THE 33KV YARD :

THE 33KV YARD

33KV YARD CONTROL PANEL:

33KV YARD CONTROL PANEL

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Total no of bays =18 33kv 4- Incomers = I & II-100MVA and 50mva-III &IV 12-outgoing feeders - Okhla phase- I/II Nehru place - I/II & IV Masjid moth Tughlakabad Balaji- I/II Alaknanda - I/II East of kailash 1-Bus Coupler = 01 1- shunt capacitor of 10 MVAR

11KV INDOOR YARD :

11KV INDOOR YARD first half bus

Slide 24:

second half bus

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Total no of bays =14 11Kv 2-Incomer - I & II 10-Outgoing feeder- On first half bus : Kalkaji A-12/10 Girinagar -1 DDA phase -2 Local transformer On second half bus : Alaknanda Girinagar -2 Kalkaji A -8 Tara Apartment Govindpuri 1- Capacitor bank-01 1-Bus coupler -01

Transformer :

Transformer Transformer is a static device which is used to transfer voltage or current at a constant frequency

Current Transformer :

Current Transformer Current transformers are devices used to scale large primary currents to a smaller, easy to measure, secondary currents. Like a traditional voltage transformer, the ratio of the windings determines the relation between the input and output currents. Current transformers of various shapes and sizes are used as an interfacing solution between high currents and instrumentation devices .

Current Transformer:

Current Transformer

Current Transformer :

Current Transformer

potential Transformer :

potential Transformer Potential transformers are instrument transformers. They have a large number of secondary turns and a fewer number of primary turns. They are used to increase the range of voltmeters in electrical substations and generating stations

Equipments in DTL:

Equipments in DTL Isolating Switches Insulators Bushing Circuit breaker Relay Lightning Arrestors Capacitor banks HRC fuse

ISOLATING SWITCHES:

ISOLATING SWITCHES In sub-station, it is often desired to disconnect a part of the system for general maintenance and repairs. This is accomplished by an isolating switch or isolator. A isolator is essentially a knife switch and is designed to open a circuit under no load.

Insulators :

Insulators An insulator , also called a dielectric , is a material that resists the flow of electric current . An insulating material has atoms with tightly bonded valence electrons . These materials are used in parts of electrical equipment, also called insulators or insulation , intended to support or separate electrical conductors without passing current through themselves

INSULATOR :

INSULATOR

BUSHING:

BUSHING A bushing is an electrical engineering component that insulates a high voltage conductor passing through a metal enclosure. Bushings appear on switchgear , transformers , circuit breakers and other high voltage equipment.

Diagram of bushing :

Diagram of bushing

CIRCUIT BREAKER:

CIRCUIT BREAKER A circuit breaker is an automatically-operated electrical switch designed to protect an electrical circuit from damage caused by overload or short circuit . Its basic function is to detect a fault condition and, by interrupting continuity, to immediately discontinue electrical flow.

Circuit breaker:

Circuit breaker

Slide 43:

Four 1 pole circuit breakers Circuit breaker switchgear A 2-Pole Miniature circuit breaker

RELAY:

RELAY A relay is an electrically operated switch . Many relays use an electromagnet to operate a switching mechanism, but other operating principles are also used.

Slide 45:

OVERCURRENT RELAY Buchholz relay

LIGHTNING ARRESTER:

LIGHTNING ARRESTER A lightning arrester is a device used on electrical power systems to protect the insulation on the system from the damaging effect of lightning When a lightning surge or switching surge travels down the power system to the arrester, the current from the surge is diverted around the protected insulation in most cases to earth.

Slide 47:

lightning arrester

Lightning Arrester:

Lightning Arrester

CAPACITAR BANK:

CAPACITAR BANK Capacitors are used to control the level of voltage supplied to the customer by reducing or eliminating the voltage drop in system caused by inductive reactive loads. The capacitor i.e. , VAR is installed in receiving substation, load substation for fast, staples control of reactive power compensation of voltage control. Capacitor banks are installed for the following purposes: 1. To improve the power factor of the system and thereby regulating the system voltage. 2. Reactive power compensation. 3.To reduce the power loss.

H R C FUSE:

H R C FUSE The primary objection of low and uncertain breaking capacity of semi-enclosed rewireable fuses is overcome in H.R.C. cartridge fuse. It consists of a heat resisting ceramic body having metal end caps to which is welded silver current carrying element. The space within the body surrounding the element is completely packed with a filling powder.

Slide 53:

H R C FUSE

THANK YOU:

THANK YOU