svv_refcase_757446_lrena.pdf

7/28/2019 svv_refcase_757446_lrena.pdf

1/8

Power system and automation reerenceEnhanced power delivery reliabilitythrough network automation

Relion


2/82 Power system and automation reerence | Enhanced power delivery reliability through network automation

Enhanced power delivery reliabilitythrough network automationSavon Voima Verkko Oy implementsABBs zone concept

Savon Voima Verkko Oy is a wholly-owned subsidiary

of Savon Voima Oyj. By the end of 2010 Savon Voimas

power distribution system had some 110 000 user

locations and some 2 600 customers were connected

to the district heating system. Within the investment

framework for enhancing the reliability of the power

delivery Savon Voima has systematically increased thelevel of automation in its power system. Protection zones

according to ABBs zone concept have been introduced

into the network and the substation protection equipment

has been renewed using IEC 61850 compliant 630 series

feeder management IEDs of the Relion product family.

The connection to ABBs MicroSCADA Pro and DMS 600

system has been secured using COM600 substation

automation devices.

The power d istribution system o Savon Voima covers an area

o 40 000 square kilometer, roughly the size o Denmark, with

a total line length o 25 000 km. The medium voltage network

is mainly composed o overhead line eeders, which count

or some 10% o the entire overhead line network in Finland.

The Savon Voimas network comprises thirty- ive 110/20 kV

and three 45/20 kV substations. Distribution management isextensively used in the power system o Savon Voima. The

entire substation base o the power system is connected to

the MicroSCADA Pro and DMS 600 system. Furthermore,

protection zones have been added to the network by installing

remote controlled reclosers on lengthy eeders. Adding

automation is a ast and cost-eective way o enhancing the

reliability o supply o the power system.

Flexible technological solutions

At the new Pellesmki substation REF630 eeder management

IEDs have been installed in ABBs Unigear switchgear. On thesubstation level an IEC 61850 substation automation bus has

been implemented. Besides the eeder management IEDs,

a SACO alarmsystem, the COM600 substation automation

The IEC 61850 substation automation bus solution and its connection to the ABBs MicroSCADA Pro and DMS 600 of the Pellesmki substation.

MicroSCADA Pro

DMS600

IEC 60870-5-104 IEC 60870-5-104

COM600

REF630 REF630 REF630 REF630 REF630 REF630 REF615RET 543

TCP/IP

IEC 61850

REF630 REF630 REF630 REA 101 SACO 16 REG-DPA


3/8Enhanced power delivery reliability through network automation | Power system and automation reerence 3

device, all by ABB, and a Petersen-coil regulator by

A. Eber le GmbH & Co. KG have been connected to the bus.

The implementation o the IEC 61850 standard on the

substation level enables a smooth interconnection o

substation devices rom dierent suppliers. One o the

strengths o the standard is that it is not a proprietary

standard o a particular device manuacturer. The entiretranser o inormation at the Pellesmki substation is routed

through the IEC 61850 bus. In industrial automation data

transer buses have been used or years. It is exciting that

the development in network companies also is heading in

the same direction. The IEC 61850 standard is an important

milestone in this ongoing development, Matti Pirskanen,

substation engineer at Savon Voima, states. Savon Voimas

network currently comprises six substations based on the

IEC 61850 standard and in the uture all new and retroit

substations will be designed according to the standard.

ABBs 630 series eeder management IEDs are reelyconigurable devices that can be lexibly conigured to suite

the intended application. The reely conigurable eeder

terminals, on their part, support our companys long-term

investment program. The conigurability enables us to not

just adapt to the networks current state, but also to uture

changes in the power system, Matti Pirskanen states.

We know right now that the network will incorporate wind

power in the near uture, that isolated overhead lines will

become common and that the degree o cabling o the power

system will increase. In the realization o the Pellesmki pro-ject one aim was also to allow or these oreseeable changes,

Pirskanen continues. In the planning phase, or instance, the

REF630 eeder management IED confgurations were prepared

or directional overcurrent protection, phase discontinuity

protection and intermittent earth-ault protection.

Total control of the whole network

All o Savon Voimas substations and remote contro lled

reclosers are connected to ABBs MicroSCADA Pro and

DMS 600. Our network is geographically widespread.

Securing high delivery reliability in this type o a networkcalls or an extensive implementation o automation.

The DMS 600 distribution management system provides

immediate inormation about the current state o the network.

Matti Pirskanen and Sami Viiliinen of Savon Voima Verkko Oy.



Among other th ings, we use DMS 600 or ault locat ion

tasks and relevant reporting. Without automation the

interruption times caused by ault instances would be too

long, Matti Pirskanen describes. In the uture, Savon Voima

plans to also use data collected rom remotely readable

meters at the customers premises or ault location.

The solution oered by ABB, where MicroSCADA Pro andDMS 600 are integrated into one package, is an excellent

solution or us. I see it as an advantage that these systems

come rom one and the same supplier. The systems cooperate

seamlessly also ater updates have been perormed to just

one o the systems, Matti Pirskanen summarizes.

The use o automation and a rel iable data transer network

go hand in hand. Savon Voima relies on its own data transer

network. The network is a so-called radio link network with

ring topology. The data transer between the substations and

the SCADA/DMS uses the IEC 60870-5-104 protocol.

The most important eature o the data transer network isits availability. Thereore we have invested in redundant

solutions and an adequate data transer capacity. Despite

the high capacity it is not a realistic option to transer all

data rom the substation level to the MicroSCADA Pro and

DMS 600. On the substation level we use COM600 station

automation devices. Through this solution we can lexibly pick

those network data collected by the protection relay system

that are essential rom the SCADA/DMS point o view, such

as e.g. network ault location calculations rom the REF630

eeder management IED, Matti Pirskanen describes.

Improving delivery reliability through automation

The main principle o the zone concept is to con ine the im-

pact o a network ault to as limited an area as possible.

A ault in the d istr ibut ion network oten inter rupts distribution

along the entire eeder and to all the consumers connected to

it. Integrating protection and reclosing unctions deeper into

the network directs reclosing unctions and interruptions

selectively to the problematic parts o the network. Thus

distribution interruptions on other sections o the network are

avoided. To do this, the eeder is divided into sections, also

known as zones. Savon Voima is among the irst network

companies in Finland to systematically implement the zoneconcept on a large scale.

By inserting reclosers the size o the protection zones o the

network can be reduced and the eects o the disturbances

limited to aect just a smaller group o customers. In practice

this means a reduction in the number o interruptions and the

interruption times experienced by the customers, Sami Viil-

iinen, development engineer at Savon Voima, explains.

For the implementation o the zone concept throughout the

distribution network o Savon Voima the insertion points orrecloser stations investigated eeder by eeder or the whole

network. In this so-called potential study the insertion o one

or two reclosers was ound to be commercially justiiable in

about one third o the some 300 eeders o the utility.

By orming a more accurate technical reliability model or

individual line eeders the most proitable location points or

reclosers and the eects obtained by reclosers can be

analyzed more accurately than with more simple potentialcalculations. In the planning process, however, the total

eects o the solutions must be noticed also on the rest o

the examined network. By means o the overall zone concept

thinking, or instance, the power quality key igures are

improved and the number o aults is reduced and the

interruption times are shortened on the zones ormed on

the line eeder, Sami Viiliinen discloses.

In the Konnuslahti pilot object, ABBs remote controlled

recloser station was inserted on a 106 km long eeder having

a total mean load o 700 kW. In the supply direction the

insertion point splits the eeder into zones. The insertion pointwas urther chosen in such a way that 65% o the mean

power o the eeder was located upstream o the station

and thus out o reach o aults arising on the eeder section

downstream o the recloser station. The mean powers o the

- 5 000

0

5 000

10 000

15 000

20 000

25 000

30 000

35 000

The potential profitability of reclosers as per line feeder.

Interruptioncosts,netsavings(/year)

Line eeders

Konnuslahti



line sections downstream o the reclosers amount to about

18% and about 17% o the mean power o the eeder.

The addition o recloser stat ion in the pilot object has a

substantial impact on the quality o the power distribution

as experienced by the customer. In the planning phase the

reduction o interruptions upstream o the recloser station

was as high as 60% and on both line sections downstream

o the station about 30% each, based on the reliability

calculation models that were used. The improvementexpected to be reached over the whole line eeder in energy

weighted interruption igures was about 50% and even

about 20% in ault interruption times.

The zone concept is also a cost-eic ient solution or

enhancing the delivery reliability o rural power distribution

networks. In the pilot network o Savon Voima the calculated

34% saving in interruption costs can be obtained with 13%

lower lie-cycle costs than in the initial state. The practical

experience o the recloser station set up a ew years ago has

been positive. This encourages us to continue on the chosen

path. Today there is an installed base o some 20 remotecontrolled pole-mounted reclosers and ive recloser stations.

In the coming years some 60 pole-mounted reclosers will

probably be installed and another 20 recloser stations,

Sami Viiliinen anticipates.

43 km

Recl. 1

Recl. 2

110/20 kV

30km

33km

Location of the Konnuslahti recloser station on the line feeder. One o the oreseeable zone concept investments will be

or the new Pellesmki substation. All along the 106 km

Pellesmki eeder standardized ABB recloser station will be

located. The unctionality o the station comprises protection

and control, also including e.g. auto-reclose unctions.

The station is provided with two remote controlled reclosers

and an arc ault resistant switchgear system with integratedisolation and earthing devices.

The insertion point o the recloser stat ion has been chosen

such that the ault prone line length downstream o the

recloser station will be considerably reduced. In the new

situation 23% o the total mean power o about 813 kW o

the eeder alls upstream o the recloser station and 27% or

50% alls on the eeder zones downstream o the reclosers.

O signiicance or the selection o the location point is that

now aults are produced on a just 66 km long section

(26 km + 40 km) downstream o the recloser instead o on

a length o 106 km in the beginning. The calculated paybackperiod o the investment is about our years.

Our goal is zero fatal accidents

The goal or the power system maintenance and

construction unctions o Savon Voima is zero severe

accidents. Personal saety and security have always been

put in ocus. Already in the 1990s we took a decision that

all new substations would be equipped with arc ault

protection. We also carried out an updating project o our

substations, during which we installed arc protection systems

also in all old substations. In the Pellesmki substationwe installed ABBs REA arc ault protection system,

Matti Pirskanen reveals. Electrical saety and saety at

work aspects are emphasized even more nowadays, as

maintenance jobs and construction work to a large extent

have been outsourced. The number o actors in the power

system ield is constantly growing. As a network owner we

must be able to assure saety at work and power system

security under all situations. Besides instructions and

guidance it is important that risks caused by human errors

also are taken into consideration in the protection system

o the substation. We have been spared rom serious

consequences because o the extremely ast operation othe arc protection system, Matti Pirskanen summarizes.

Parameter

Interruption time*

Number o interruptions*

Interruption costs (CIC)**

Lie-cycle total costs

The impact of the pilot object on the energy weighted key figures,

interruption costs (CIC) and the economical profitability of the investment.

* The interruption time and number o interruptions are energy weighted key fgures othe power quality.

** Reducing CIC-costs (customer interruption costs) means that the delivery reliability

improves correspondingly.

Impact

- 20%

- 50%

- 34%

- 13%



Network automation solution

Embedding the communication solutions deep in the

network structure and including all the central equipment

into ABBs MircoSCADA Pro and DMS 600 enable the

effective use of the entire network. Disturbance situations

can be resolved effectively with the help of accurate

fault locating and DMS functions. In case of a fault,

the reclosers with versatile protection capability

automatically perform fast, zone-discriminative fault

disconnection. In case of major disturbance, the zone

division significantly facilitates the use of the network.

The operative actions can be performed in a safe way,

and the use of earthing switches ensures secure and

reliable earthing in all network situations.

Wind power plant

Pellesmki

110/20 kV

Unigear switchgear, REF630 feeder management

IEDs and REA arc protection system

Station automation device COM600

110/20 kV



MicroSCADA Pro

Hydro power plant

Network Control Center

Distribution Management System

DMS 600

Data communication

network IEC 104

Pole mounted recloser

Recloser station


8/8

Contact us

1MRS757446

C

opyright2011ABB.

Allrightsreserved.

ABB Oy, Distribution Automation

P.O. Box 699

FI-65101 VAASA, Finland

Phone: +358 10 22 11

Fax: +358 10 22 41094

www.abb.com/substationautomation

Documents

svv_refcase_757446_lrena.pdf