Future Indian Grid With 765kV and Above

8/10/2019 Future Indian Grid With 765kV and Above

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Future Indian grid with 765kV and

above

A.K.Tripathy

Advisor Silicon Institute ofTechnology NWET 2013


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Towards a strong grid

Large grid does not mean a strong grid.

Grid is as weak as the weakest interconnection is.

Distant nodes have larger phase angle difference

Islanding is difficult with high level inter connection

Possibility of un-damped oscillation is higher

Consequences of grid failure in a large grid can be moredamaging.

This has to be weighed against higher reliability, better

trading opportunity, optimal utilization of network.Is there a limit to the size of a grid from aboveconsiderations


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Question

Overlaying a higher voltage networkstabilizes the grid.

Major issues are reactive power management,and contingency management,

Intangible benefits are

research and development, new generation ofproducts, lesser right of way


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Peak demand inIndia is expected

to increase

to more than500,000 MW by

2027 for which

installed

generation

capacity of

about 700,000

MW is required..


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Pushing Technological Frontiers in Transmission

400 kV

1977 1990 2000 2011 2012/13

765kVAC

800 kV HVDC 1200kV UHVAC

500 kV HVDC


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Changing philosophy in expanding the

Indian grid

Regional self sufficiency

Asynchronous inter regional connection by HVDCB2B links

Synchronous north, north east , eastern andwestern regions

And southern region joined asynchronously.

One Nation , one grid A 765kV backbone and introduction of UHV AC

and DC


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A large grid propagates disturbancewider and farther

1. Different mix of generators respond differently.

The faster ones take the onus and slower ones donot participate

2. Protection settings are fixed and not adaptive,and therefore ,no survival effort

3. Larger fault currents stress equipments andfaster protection reduces fault ride through

capability


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Indian Power Network is one

of the biggest

Transmission Grid Comprises:

765kV/400kV Lines - 95,500 ckt. km

220/132kV Lines - 114,600 ckt. km

HVDC bipoles - 4 nos.

HVDC back-to-back - 7 nos.

FSC 18 nos.; TCSC 9 nos.

NER, ER, NR & WR operating as single grid of 95,000MW

Inter-regional capacity : 27,600 MW


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NORTH EAST-AGRA 3000

MW

ADANI 2500 MW

CHAMPA HVDC ARECA


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JEYPORE

SASARAM

SIPAT

DHULE

SOLAPUR

PUNE

KARNOOL

HYDERABAD

ITARSI

BINA

WARDHA

RAICHUR

INDORE

VIJAYAWADA

SEONI

SATNASASAN

KOTA

JAIPUR

AGRA

MOGA

MUNDKA

GWALIOR

KISHENPUR

TEHRI

LUCKNOW

FATEHPUR

BAREILLY

MEERUT

1200KV UHVAC LINES

765KV EHVAC LINES

800kV HVDC BIPOLE

LEGEND

IB VALLEY

NKSTPP

RANCHI

GAYA

BALIAPURNEA

SILIGURI POOLING

POINT

NER

AURANGABAD

RAIPUR

Perspective Hybrid Grid by 2022 & beyond

765kV/1200kV AC and

800kV, 6000MW HVDC

Hybrid Grid


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LINE VOLTAGE 765 KV

HIGHEST SYSTEM VOLTAGE 800 KV

RATED CURRENT 2000 A

SYSTEM NEUTRAL EFFECTIVELY EARTHED

SHORT CKT CURRENT 40 KA for 1sec BIL 1950 KVp for transformer and

reactors and 2100 KVp for

S/S AND 2400Kvp for line

SIWL 1550 KVp

POWER FREQ 830 KV rms RIV at 508 KV rms


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Progress in 765 kV

First 765 kV line Sipat-Seoni approved in 2000 andcommissioned in 2008

Western pooling stations and LILO of D/C line

completed. Under various stages:-

Anpara-Unao, Seoni-Bina, Seoni-Wardha, Bara-Fatehpur, Bara-Mainpuri, Gaya-Balia, Gaya-Baranasi,

Sasaram-Fatehpur, Barh-Gorakhpur, Auria-Gwalior,Agra-Gwalior, Gwalior-Jaipur, Raichur-Sholapur,Narendra-Kolhapur, Gwalior-Bina, Sasaram-NorthKarampura, North Karampura-Sipat


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Prominent Ferranti Effect

Higher Corona losses

Prolonged secondary arc extinction time Higher slow front O/V on ground faults

High breaker TRV peak

Severe VFTO due to geometry and Topology

ISSUES AT UHV LEVEL


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National Grid by 2012

CHANDRAPUR

U.SILERU

NAGJHARI

SR

KOLHAPUR

PONDA

1000

MW

BELGAUM

MW1000

GAZUWAKA

RAIPUR

VINDHYACHAL

WR POOLING

GORAKHPUR

WR

GWALIOR

UJJAIN

NAGDAZERDA

MALANPUR

AGRA

KANKROLI

RAPP

KOTA

AURAIYA

FATEHPUR

NR

BIRPARA

ER

MALDA

SILIGURI

NAGARPURI

BALIMELA

SIPAT

KORBA

ROURKELARANCHI

TALCHER

DEHRI

SAHU

BALIA

MUZAFFARPUR

PATNA

BARH

B'SHARIFF

NABI

NER

BONGAIGAONSALAKATI

NARENDRA

1000MW

500MW

BUDHIPADAR

SASARAM

GAYA

Inter-regional capacity : 30,700

MW


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+500kV HVDC experience from Rihand Delhi &ChandrapurPadge

+600kV HVDC experience from Foz-du-Iguasu

to Sao Paulo Specifications of + 800kV Systems are under

preparation by POWERGRID, CHINA, SOUTH

AFRICA, BRAZIL, EPRI and other consultants.

+800kV HVDC Systems


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1200 kV introduced

1200kV test line commissioned at Bina and

handed over to Nation

Deol near Wardha will be the first 1200 kV

commercial line

DeolAurangabad line will be second

400/1200kV substations are planned at Deol

and Aurangabad


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UHV Transmission: India and

China

Development of a 1200 KV UHV AC system, thehighest AC system in the world, is an Indian dream to

tackle the ever growing power demand which isexpected to be over 400 GW by 2020. Although manycountries in the world like USSR, Japan, America &Italy have made great progress in the research of

1200KV ultra high voltage AC transmission systemonly China has recently established the commercial1100 kV system successfully.


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NORMAL

ANDCOMPACT

TOWERSAT 800 kV


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Corona cage is used to

study the corona

characteristics and

environmental aspects of

the UHV overhead

transmission line, such as

:

radio interference

audible noise and

corona loss.

The corona cage consists ofa single test conductor or

conductor bundle placed

concentrically inside a

metallic cylinder with a

much larger radius.


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A 400 km long line

generates 2400 MVRShunt MVAR to behandled will be 2400MVAR

Dynamic compensation

Instead of fixed andswitched shuntreactors, matching

dynamically controlledshunt reactor will berequired

Dynamic compensation

system


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Air Insulation Studies For 1200 kV UHVAC

Transmission Line:

The study is to optimize conductor tower

air insulation clearances for adoption in1200 kV AC transmission lines. Eight

Bersimis conductor bundle was used for the

study.

The critical wave shape was used for

determining the optimum clearance required

for withstand voltage of 1800 kVp

corresponding to 1200 kV transmission lines.


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Crompton Grieve

and BHEL supply the 1200 kV

CVT

India's First 1200 KV Power Product


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1200KV single V suspension

string for 8 bundle ACSR MOOSE

(OCTAGONAL)

1200kv double tension insulator

string suitable for 8 x ACSR

bundle

T-connector and BPIconnector


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1200kv single suspension insulator for 8 x ACSR


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CVT and CT

Transformer

CVT,CT and Surge arrester


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The rated voltage of surgearrester is 850 kV and LightningImpulse Protective Level (LIPL)and Switching ImpulseProtective Level (SIPL) as 1700kV (at 20 kA) and 1500 kV (at 2

kA) respectively. Few moreexamples of such equipmentsuccessfully developed areTransformer,Circuit

breakers,Isolators,insulators bothprocelain and

polymers,Transmission LineTowers,Line Hardware andconductors etc.

.


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800kV HVDC CONVERTER TRF.

BUSHING (20.6 m)


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800kV Ultra HVDC

Impressions from Transformer Transport


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View of 1200kV Trf. Vijai electricals

make


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CGL MAKE Trf.


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BHEL make Transformer


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Bina 1200 kV Subtations


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Another view


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1200kV double ckt. towers


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1200 kV single ckt. Transmission line


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Evening shadows on the substation


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Cooler bank transformers


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View of switchyard


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765kV CTs


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765kV Transformer Yard


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765kV Circuit Breakers


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765kV Tower


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765kV Transformer Yard


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Need for a National Reliability Council

IN USA MODEL

The best managed grids in the world can fail.

Important thing is to analyse failure and learn.

Claiming high PLF and Transmission availability is not all.The acid test is reliability of the supply chain.

We need a neutral National level reliability council.

Public at large have a right to information.


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Conclusion

Research provides knowledge.

Knowledge provides courage

Courage allows risk.

No Risk, there is No gain.

Research therefore is always justified

Documents

Future Indian Grid With 765kV and Above