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MODERNIZATION ELECTRIC SUBSTATIONS 110/20 KV

Buletinul AGIR nr. 4/2012 ● octombrie-decembrie 1

MODERNIZAMODERNIZAMODERNIZAMODERNIZATION ELECTRIC SUBSTATION ELECTRIC SUBSTATION ELECTRIC SUBSTATION ELECTRIC SUBSTATIONSTIONSTIONSTIONS 110/20 KV110/20 KV110/20 KV110/20 KV

Eng. Florin DRACEANU PhD, Assoc. Prof. Eng. Cezar Dumitru POPA PhD,

Assoc. Prof. Eng. Dumitru Radu PENTIUC PhD, Assoc. Prof. Eng. Leon MANDICI PhD

University „Stefan cel Mare” from Suceava

Faculty of Electrical Engineering and Computer Science,

.

ABSTRACTABSTRACTABSTRACTABSTRACT. . . . The subjectsThe subjectsThe subjectsThe subjects ””””connection to theconnection to theconnection to theconnection to the national energy systemnational energy systemnational energy systemnational energy system installationsinstallationsinstallationsinstallations producingproducingproducingproducing renewable electricityrenewable electricityrenewable electricityrenewable electricity """" is topical is topical is topical is topical andandandand of of of of great great great great importanceimportanceimportanceimportance for futurefor futurefor futurefor future managers ofmanagers ofmanagers ofmanagers of wind powerwind powerwind powerwind power, , , , photovoltaicphotovoltaicphotovoltaicphotovoltaic, , , , biomassbiomassbiomassbiomass cogenerationcogenerationcogenerationcogeneration. . . . Economic situationEconomic situationEconomic situationEconomic situation inininin RomanRomanRomanRomaniaiaiaia alsoalsoalsoalso influenceinfluenceinfluenceinfluence thethethethe choice ofchoice ofchoice ofchoice of the final solutionthe final solutionthe final solutionthe final solution. . . . Whatever the solutionWhatever the solutionWhatever the solutionWhatever the solution chosenchosenchosenchosen safety and security ofsafety and security ofsafety and security ofsafety and security of SENSENSENSEN are those are those are those are those thatthatthatthat prevailprevailprevailprevail in the final decisionin the final decisionin the final decisionin the final decision. . . . InInInIn the followingthe followingthe followingthe following I will presentI will presentI will presentI will present a solutiona solutiona solutiona solution to upgrade anto upgrade anto upgrade anto upgrade an existingexistingexistingexisting connectionconnectionconnectionconnection stationsstationsstationsstations SENSENSENSEN in in in in order toorder toorder toorder to connectconnectconnectconnect a winda winda winda wind.... Keywords:Keywords:Keywords:Keywords: station, tehnology, AIS, GIS, SEN (the national energy system),

1. INTRODUCTION

Power System consists of the set of all

interconnected power plants located in the territory of a

country by which the manufacture, transportation,

distribution and use of electricity.

Connection to National Energy System NES all

electricity producers are particularly important for the

performance of the obligations assumed by Romania in

Directive 77/2001/CE Strategy for renewable energy

approved by GD 535/2003 and Roadmap energy, part

of the EU accession agreement.

The main objectives for connection to NPS

park wind power or solar are:

• LES MT and MT connection points;

• MT/110 kV transformer substation;

• LES / 110 kV;

• Extending substation 110/20 kV connection existing

in the national energy system (NES).

Developed by geographical area is as follows:

in total, about 60% of EC are located in Dobrogea, 30%

in Moldova and only 10% in the rest of the country.

There is currently an installed capacity of about 1,400

MW in operation CEE and CEE 14,000 MW have been

awarded contracts for connection

2. CONSIDERATION TEHNOLOGIES FOR WORKSTATION IN THE NES

The performance of a transformer station

110/20 kV is mainly given by:

- The quality of functional assemblies

- Type of single line diagram

- Operating system adopted.

The performance must consider: its importance

in SEN (for interconnection of power evacuation from

plants etc.), The nature of consumers with the risk

assumed by the owner and environmental impacts

including population.

As functionality for power plants renewable

energy sources are:

a) collecting the medium voltage substations for

distributed sources;

b) transforming power stations (the most common being

MT/110 kV) to adjust parameters generated energy

optimal technical and economic conditions of transport

to the point of coupling to the network;

c) power stations connecting to the transmission /

distribution as specified in the technical connection of

the operator product of the transmission, the following:

Buletinul AGIR nr. 3/2013 ● iulie-septembrie_____________________________________________________________________________________

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INT. SYMPOSIUM ON ELECTRICAL ENGINEERING AND ENERGY CONVERTERS – ELS 2013


• extension of existing power stations, with a scheme

to minimize disruption during the installation operation

during extension works;

• Building a power station with an input-output

scheme in an existing power line, the 110 kV network

application;

d) power stations directly connected to the user with

NES in the airline, LES-LEA (underground electric

line - overhead line ) connection.

For grid connection of renewable energy

sources have identified two specific conditions:

- Making enlargements with minimizing freezing

facilities

- Values for nominal currents of devices / busbar 4000

A and the threshold currents of 40 kA short circuit.

Analyzing all the above we can identify two

types of transformer substations:

- User station, the station that belongs to the producer of

renewable electricity;

- Station record, being the state where they connect

with NES.

2.1 User stations 110 kV electric

Maximum power generated within wind farms /

PV are 20-100 MW so that schema used is the line-

transformer block.

In most cases these stations are of the AIS (air-

insulated stations) and more rarely of GIS (Gas

Insulated stations). Both types of stations in terms of

economic costs (construction + equipment +

installation) so close that it is time to achieve decisive,

all customers without exception, are interested in an

operation in the shortest time possible.

An example of a stop used with a single step-up

transformer can be seen in Figure 2.1, and an example

of a user station with two transformers elevated in

figure 2.2 and 2.3.

In Figure 2.1 and 2.3 are classical stations with

modern equipment and figure 2.2 we have a compact

docking station.

Fig. 2.1 AIS station with a single-up transformer consists of a single

cell

Fig. 2.3 AIS station with two transformers lifts

Fig. 2.3 AIS station consists of two step-up transformers two cells

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Buletinul AGIR nr. 3/2013 ● iulie-septembrie



2.2 110 kV substation connection

If the connection state is changed stations

generally operators of distribution networks, E-on and

ENEL, impose strict mode, type of connection and the

system solution.

For substations connecting with input-output

scheme in existing power line they use compact

modules required in a scheme to switch to H line,

without hitch and dividers to users.

For connection to existing 110 kV substation

design becomes a real challenge being atypical

situations on a case by case:

• connection to the existing roof, available in a field;

• Connection to existing roof, extended by 1-2 fields for

the new cell;

• installing a breaker in an existing cell,

• adapt the new airline starting cells or cord, if

applicable;

• location of new construction on existing surface

station;

• modernization of relay protection.

• Enhancing the metering and power quality

monitoring,

• integration of new cells in the network operator's

SCADA system.

The following are two types of connection stations,

One in Figure 2.4 is one stop scheme input - output, and

in Figure 2.5 is shown a refurbished stations with

compact modular SF6.

Fig. 2.5 GIS station with two line cells connected to the National

Grid via overhead line

Fig. 2.6 GIS station with two cell line cable entry - exit air

2.3 Technical-economic study of 110 kV substations

The apparatus of existing stations composition

insulating medium is air, SF6 and insulating oil and

carcasses and support insulators are porcelain or

composite materials.

As time passes and technology development

has moved from AIS GIS technology, these stations are

located Insulated especially in urban areas and areas

heavily polluted.

Currently upgrading stations within transport

networks is achieved through SF6 equipment with a

higher reliability than the domestic. Operating costs are

lower, and the average number of interruptions is

order of 0.2 interruptions / year. One can obtain a size

of less than about 10%.

The table below shows the values of 110 kV

primary equipment most commonly used in substations

of 110/20 kV. Value primare110kV equipment

Domeniul de cheltuieli per bucată Unitatea monetară € lei

Modul hibrid pt celula LEA 170000 765000

Modul hibrid pt celula LES 145000 652500

Modul hibrid pt celula TRAFO 155000 697500

Transformator de 25 MVA 305000 1372500

Intreruptor 1600A 29500 132750

Separator de cupla cu doua CLP 9100 40950

Separator tripolar delinie sau bară 8650 28925

Separator monopolar cu un CLP 4000 18000

Transf. de tensiune capacitiv 5200 23400

Transformator de tensiune inductiv 5800 26100

Transformator de curent 5850 26325

Descarcator Zn-O 1250 5625

Descărcător de nul 1000 4500

Izolatori dubli 900 4050

_____________________________________________________________________________________MODERNIZATION ELECTRIC SUBSTATIONS 110/20 KV


321



Information a user station, belonging to EC 20

MVA, AIS type cell equipped with a transformer as in

Figure 2.1. has a value of about 1.042 million euros and

a connecting station as in Figure 2.5 equipped with two

GIS cell line with a simple busbar sectioned

longitudinally with a three-phase separator coupling has

a value of about 1.280. 000.

3. SOLUTIONS FOR CONNECTION TO NES

Consider a wind power plant with a capacity of 70 MVA consists of 23 wind turbines, a substation MT/110 kV and 110 kV underground transmission line, which requires distribution network manager to connect to the National Grid through a station the 110 kV as in Figure 3.1a, b.

The station is currently Connection type H configuration, simple bar 110 kV sectioned longitudinally through a coupling cell being connected to two stations, one 400/110 kV and two 220/110 kV.

On the station has two 110 kV tie line - transformer, equipped with one switch IO 110 kV 1600 A, acted with a oleopneumatic, MOP 1 second transformer 25 MVA, 110/20 kV Type TTU-FS , placed on concrete foundations, equipped with oil collection tank, filled with.

SL SL

I I

I I

SB SB

SB SB

BC

110

TTTT

TTTT

Tr Tr

TCTC

TCTC

DD

Ic

TSI

PP

TSI

ScSc

BC

110

Fig 3.1.a overview

1

1

2

2

Sa2220/110 kV

110kV

110kV

Sa1400/220/110kV

Btr

LEA 110kV

OL Al 240/40mm L=20km

2

L

EA

110

kV

OL

Al

240

/40

mm

L

=13

km

Bc

S S

I

I I

I

TC TC

TC TC

TT TT

D D

T1T2 25 MVA25 MVA

S

Sc Sc

S

D D

CLP CLP

Ic

ST 110/20kV

Fig. 3.1b wiring diagram monifilară

The following are considered four solutions to expand and modernize the existing station SEN, in order to connect the wind farm to farm. Using electric line cable solution is preferred because the manufacturing technology has developed a lot of cables that allowed carrying a higher power safer (insulation performance, cooling, oil-free alloys improved and enlarged sections) , also reducing manufacturing costs. Solution -1 - consists of: Creating a new cell

line of 110 kV underground alpha1 CEED with modern

air-insulated equipment, in accordance with the

requirements of network management. Step cell will be

16 m and requires expansion stops outline an area of 9 x

30 m to the right or left of the control room.

Demarcation point and patrimonial

management facility is across the line for the cell

separator new 110 kV station.


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SL

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SB SB

TT TT

TT

TC TC

D

D

CT

Ic ScSc

SL

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SB

TT

TC

D

BC

110

BC 110

I I

SB SB

TTTT

Tr Tr

TCTC

TSI

PP

TSI 9000

300

00

Fig 3.2 Solution -1-

LES 110 kV connection to the cell terminals

will be designed outdoor dry type insulation composite

joint backing surge.

Disposition chosen design architecture retains

the existing line of the other two cells.

Busbar extension is made with aluminum bar AL

following the same section.

Cell line 110 kV project will be equipped with:

- An outdoor circuit breaker, SF6 (Um = 123 kV, In =

1600 A);

- Three current transformers, single-phase type support

(100/5/5/5/5 A);

- Three capacitive voltage transformers (110 / √ 3 / 0.1 /

√ 3 / 0,1 kV);

- 3 ZnO surge arresters and insulation composite

(meters downloads included) mounted to protect the

cables of 110 kV;

- A rotating separating two knives pole grounding at

each breaker and one for LES;

- A pole rotary separator, single CLP to breaker.

At 110 kV bar will connect a new measuring

cell made with 3x TT 110 / √ 3 / 0.1 / √ 3/0, 1 kV.

Installation of earthing station will be completed by

extending the surface with boundary extension (at 1 m

from fence enclosure) tubular electrode OL-Zn Φ 2

"1/2, l = 3m, 6m place between them and connected to a

strip 50x5 mm Zn OL. Potential distribution routing

socket will be extended by extending the main earthing

conductor electrodes OL Zn horizontal strip 50x5 mm.

Equalization distance between bands will be the same

as the current distance, where one or more of the main

earthing conductor will be affected by the work of the

foundation for bearing equipment designed, then it will

be replaced, taking into account the average distance

between bands of equalization of 5m.

Fig 3.3 Sample cell type underground line departing AIS

The cell design shall be provided with

terminals numerical protection and remote control

functions, which will be mounted in cabinet for

protection tomandă-cell and panel designed for

transformers.

Protection scheme based on the line will be

composed of:

- Longitudinal differential protection provided to

support tactical

- Maximum current protection delay;

- Directional homopolar current maximum protection;

- Subsidiary protection;

As complementary terminal will mount an IED

with PLC functions, it will retrieve and monitor current

in CT secondary sites of cell line when transmitting Sa1

confinement exceeding the maximum current value

deconecatrea of strength produced by dispatchable wind

power plant CEED.

Solution -2- solution contains 1 total refurbishment

with modern equipment plus air-insulated.

Is the most inconvenient due to land costs for

new cell for the cost of new equipment.

Solution -3- consists of: Creating a new cell line EEC

110 kV underground way through a 110 kV compact

multifunctional complex type DY 107/10 R0-A

encapsulated in SF6 Figure 3.4.

The module will be placed under the existing

110 kV bar and will encompass the following functions:

_____________________________________________________________________________________MODERNIZATION ELECTRIC SUBSTATIONS 110/20 KV


323



The module will be placed under the existing

110 kV bar and will encompass the following functions:

Cell line: - 2x SEP 123 kV + CLP;

- breaker 2500 A;

- 3xTC 100/5/5/5 A,

- 3xTT 110/√3 / 0,1/√3 / 0,1 kV;

- SF6 cable terminal pole;

- Terminal connection bars 110 kV.

Additionally compact module is essential to

measuring cell and measuring group ready for

implementation in remote management system

implemented at NPS;

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I

SB

TT

TC

D

BC

11

0

SL

I

SB

TT

TC

D

Ic ScSc

TSI TSI

I

SB

TT

Tr

TC

PASS

I

SB

TT

Tr

TC

PP

Fig 3.4 solution - 3 –

The point of separation of facilities

management and property is LES connection terminals

SF6 compact module.

The overall dimensions allow the installation

GIS module between the pillars of the existing bar

crossmember, respecting and protecting electrical

distances acc on 101/85.

Atmospheric surge protection and / or

switching will be performed with ZnO arresters

mounted composite insulated 110 kV bar.

Arresters are connected in ways distinct from

existing installation earthing band, OL

Zn 50x5 mm or according to equipment

supplier's instructions.

Monitoring and diagnosis module is compact

multifunctional local device panel (HMI - Human-

Machine Interface).

Solution -4- consist of: Complete refurbishment of the

existing substation with SF6 insulated compact

modules.

Teren disponibilizat - 40%

PASS PASS

PASS PASS PASS

Sc

BC

110

BC

110

Tr

DD

Tr

P P

TSIT SITT

410

00

270

00

46000

Fig 3.5 solution -4-

4. CONCLUSIONS

The level of technology used in the creation,

development or upgrading substations is more advanced

the greater reliability, it provides enhanced Mentana

during life of stations increases.

Economic situation in Romania also influence

the choice of the final solution. Whatever the solution

chosen safety and security of SEN are those that prevail

in the final decision.

To increase safety RPS will create all the

conditions required by developers electricity markets

using highly reliable gear for systems monitoring,

command and control parameters evolution functional

assemblies.

BIBLIOGRAPHI

[1] Ghid privind accesul la RET a noilor solicitanţi sau

dezvoltări ale utilizatorilor existenţi, Transelectrica 2011 [2] ABB, Switchear manual 10th edition 2004

[3] ABB, Gas Insulated Switchear modular and flexible, 2009


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