Report on 220kv Grid Substation

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Transcript of Report on 220kv Grid Substation

220/132KV Deva Road Chinhat, Lucknow

A PRACTICAL SUMMER TRAINING REPORT

ON

DELHI TRANSCO LIMITED 220 KV GRID SUBSTATION AT SARITA VIHAR

NATIONAL POWER TRAINING INSTITUTE (NR)

BADARPUR, NEW DELHIUNDER THE GUIDANCE OF

SUBMITTED BY:MR. RAM SINGH (A.M.)

MD. NAFIS IQBALMR. HANS KUMAR (J.E.)

B.TECH. POWER ENGINEERING (5th SEM.)ROLL NO. 00315307511ACKNOWLEDGEMENT

I am highly indebted to Mr. Ram Singh (Asst. Manager, 220 KV DTL S/S Sarita Vihar) for their invaluable support without which the project could have not been worked out the way it has. I am very much thankful to Mr. Hans Kumar (J.E. 220 KV DTL S/S Sarita Vihar) who helped me immensely in understanding the basics and complexities of along with additions that made the quality of report better. I would also like to extend a note of thanks to all other employees of Delhi Transco Limited who helped me directly or indirectly in successful completion of my project. Last but not the least, I would like to thank my parents & all my fellow trainees who have been a constant source of encouragement & inspiration during my studies & have always provided me support in every walk of life

MD. NAFIS IQBAL

CONTENT

1. Introduction

1.1 Introduction to Delhi Transco Limited

1.2 DTL Network

1.3 Grid Diagram of Delhi

2. Introduction to Substation

3. 220/33/11 KV GIS Substation Trauma Centre3.1 Single Line Diagram

3.2 Description of SLD

3.3 Parts of Substation

3.4 Equipments used in Substation

4. Description of Substation Equipments 4.1 Transmission Lines4.2 Bus Bar4.3 Isolators4.4 Transformers

4.4.1 Introduction

4.4.2 Power transformer

4.4.3 Parts of Power Transformer

4.4.4 Transformer Cooling

4.4.5 Protection devices

4.4.6 Maintenance

4.4.7 Technical Specifications

4.5 Instrument Transformer

4.5.1 Current Transformer (CT)

4.5.2 Potential transformer (PT)

4.5.3 Capacitor Voltage Transformer (CVT)4.6 Circuit Breaker (CB)

4.6.1 Types of CB

4.6.2 Technical Specification 4.7 Capacitor Bank

4.8 Insulator

4.9 Wave Trap5. Protection System

5.1 Over Voltage Protection

5.1.1 Ground Wire

5.1.2 Earth Screen

5.1.3 Lightning insulator

5.2 Over Current protection

5.3 Earth fault protection

5.4 Primary and back up protection

5.5 Relays

5.6 Fuses

5.7 Earthing System

6. Control Room

7. Battery Room

8. PLCC and SCADA System

9. Operation and maintenance of Substation

9.1 Introduction

9.2 Maintenance activity

9.3 Maintenance Schedule

9.4 Maintenance Schedule Table of

9.4.1 Oil filled power transformer

9.4.2 SF6 Circuit Breaker

9.4.3 Relays and protection circuit

9.4.4 Arrestors

9.4.5 Transmission lines

9.5 Thermo Scanning

10. General Safety Precautions

11. Conclusion

References

1. INTRODUCTION1.1 AN INTRODUCTION TO DELHI TRANSCO LIMITEDDelhi Transco Limited, a successor company of erstwhile Delhi Vidhyut board, came into existence on 1st July 2002, as a State Transmission Utility of the National Capital. After unbundling of DVB the distribution sector has been handed over to private companies while the generation and transmission are still with the government. Over the years, DTL has evolved as a most dynamic performer, keeping pace with the manifold challenges that confront the ever increasing demand-supply power situation and achieving functional superiority on all fronts.

Being the capital of India and the hub of commercial activities in the Northern Region, coupled with the prosperity of population, the load requirement of Delhi has been growing at a much faster pace. Added to that, being the focus of socio-economic and political life of India, Delhi is assuming increasing eminence among the great cities of the world. Plus the vgision-2021, aiming to make Delhi global Metro politic and world class city demand greater infrastructure to enrich many services of infrastructure development. DTL has been responsibly playing its role in establishing. Upgrading, operating and maintaining the EHV (Extra High Voltage) network. DTL has also been assigned the responsibility of running the State load Dispatch Centre (SLDC) which is an apex body to ensure integrated operations of power system in Delhi. Delhi Transco is also committed to promote energy conservation not only in its own establishments but also in the entire Delhi. The company has done a lot to educate and sensitize the general public about the need of energy conservation. Transmission loss level has been reduced from 3.84 per cent in 200-203 to 1.38 per cent in 2009-10, which is one of the lowest transmission loss level in the country. To ensure adequate and efficient power supply. DTL has been continuously upgrading its biggest achievement has been its ability to handle the highest ever peak demand of 4720 MW in July 2010. The total availability of its transmission system stood 98.78%. The modern technologies are being implemented in DTL by way of constructing GIS sub stations and laying XLPE 220 KV cable by employing cable link techniques and would be the largest network of its kind in India.

1.2 DTL NETWORK

It contains the line diagram of the DTL network which connects all the networks of the 5 DISCOMs working in the Delhi region.

1.3 GRID DIAGRAM OF DELHI

2. INTRODUCTION TO SUBSTATION

Electrical power is generated, transmitted in the form of alternating current. The electric power produced at the power stations is delivered to the consumers through a large network of transmission & distribution. The transmission network is inevitable long and high power lines are necessary to maintain a huge block of power source of generation to the load centers to inter connected Power house for increased reliability of supply greater.

An electrical substation is a part of an electricity generation, transmission and distribution system where voltage is transformed from high to low or in reverse using transformers. It also serves as a point of connection between various power system elements such as transmission lines, transformers, generators and loads. To allow for flexibility in connecting the elements, circuit breakers are used as high power switches. Electric power may flow through several substations between generating plant and consumer, and may be changed in voltage in several steps. There are different kinds of substation such as

Transmission substation, distribution substation, collector substation, switching substation and some other types of substation. The general functions of a substation may include:

Voltage transformation

Connection point for transmission lines

Switchyard for network configuration

Monitoring point for control center

Protection of power lines and apparatus

Communication with other substations and regional control center

Making an analogy with the human body, the role of substation in the power system to address the above mentioned issues is pivotal: the substations are the center of the nervous, immune, musculoskeletal and cardiovascular subsystems of the entire power system body. The nervous subsystem role of the substation is to allow the central system to sense the operating states, view status of the equipment, and make assessments of the system criticality. The immune subsystem role is to develop self-defense means and sustain self healing strategies. The musculoskeletal subsystem role is to maintain the system topology, switch the equipment state and restore the power flows. The cardiovascular subsystem role is to sustain normal power flow and control the synchronization.

The substation includes the primary equipment (such as circuit breakers, transformers, instrument transformers, etc.) and the secondary equipment (monitoring, control and protection devices) which are installed in control house.

In the primary side, a large number of breakers and disconnectors are used in order to allow for maintenance and repair with a minimum of interruption, which occupy large space. Oil-insulated transformers are used to step-up or step-down the voltage level for purposes needed. Oil-insulated transformers usually have big size and have potential explosion problems. In addition, the maintenance is also elaborate and the noise of those transformers is also a big issue. The breakers also need an insulation media which may be oil, gas, or air.

Conventional current and potential transformers (CTs and VTs) are used to convert the primary current and voltage to an operation range (0-5A and 115V) for metering and protection. The CT saturation and open secondary CT circuit safety issue are primarily of concern in such devices.

All interfaces between primary and secondary equipment are connected by hard-wired cabling. Different length and types cables are bundled as shown in Fig.1.2, which makes it labor intensive for future maintenance and modification. In addition, due to the large number of wires in a highly electromechanically polluted substation switchyard environment, the wiring may experience significant electromagnetic interference (both conducted and radiated).

3. 220/66/11 KV GRID SUBSTATION AT SARITA VIHAR:The 220 KV Grid Substation at Sarita Vihar is a Air Insulated Outdoor Substation. This is 220/66/11 KV Substation.There are four 220 KV incoming feeders for this substation coming from:

1. Pragati Powers2. Power Grid3. BTPS CKT. No. 14. BTPS CKT. No. 23.1SINGLE LINE DIAGRAM3.2DESCRIPTION ABOUT SINGLE LINE DIAGRA