the new switchgear standard

7/28/2019 The new switchgear standard

1/8

Siemens AGPower Transmission and DistributionMedium Voltage DivisionMozartstr. 31c91052 ErlangenGermany

www.siemens.com/energy

For questions on power transmission anddistribution, please contact our CustomerSupport Center, 24 hours a day.Tel.: +49 180 / 524 70 00Fax: +49 180 / 524 24 71(Subject to charge: e.g. 12 ct/min)E-mail: [email protected]/energy-support

Subject to change without prior notice

Order no. E50001-U229-A282-X-7600

Printed in Germany

Dispo 30403

GB 06612 101976 08064.

The inormation in this document contains general descriptions o the technical eatures, which may not always be available.

An obligation to provide the respective perormance eature shall exist only i expressly agreed in the terms o contract.


2/8

Power Transmission and Distribution

We are ready: IEC 62271-200The new switchgear standard


3/8

Standards for all

Switchgear are important nodal points

in modern power distribution. Corre-

spondingly important is their reliable

unctioning, a clearly deined switch-

ing behavior according to speciied

parameters as well as the protection o

personnel and protection against oper-

ational interruptions when an overload

occurs.

The International Electrotechnical

Commission (IEC) has taken up thetask o developing the required speci-

ications, their worldwide standard-

ization and urther development. The

same applies to IEC 62271-200 the

new standard or medium-voltage

switchgear.

As one o the irst manuacturers,

Siemens has implemented these

requirements and already oers the

complete product range o air-insu-

lated and gas-insulated switchgear

today, type-tested according toIEC 62271-200.

2

IEC 62271-200

IEC 62271-200


4/8

IEC 60298 or our decades this abbre-

viation was the decisive actor or the type

testing o metal-enclosed switchgear. In

the meantime there are tens o thousands

o switchgear panels o the primary and

secondary distribution level based on this

standard in use certied according to

the mandatory part o the standard and,

i required, according to optional tests.

The passing o the ollowing tests was

obligatory in order to identiy switchgear as

type-tested:

Dielectric test to veriy the insulation

level o the switchgear (tests with rated

lightning impulse withstand voltage and

rated short-duration power requency

withstand voltage with the specied

values depending on the respective rated

voltage).

Temperature rise tests to veriy the

current carrying capacity with rated normal

currents.

Peak and short-time withstand current

tests to veriy the dynamic and thermal

current carrying capacity o the main and

earth circuits; the tests are perormed with

rated peak short-circuit current or rated

short-circuit making current or rated short-

time current or rated short-circuit breaking

current.

Switching capacity test to veriy the

making/breaking capacity o the installed

switchgear.

Mechanical unction test to veriy the

mechanical unctions and interlocks.

Degree o protection tests to veriy the

protection against electric shock and oreign

objects.

Pressure and strength tests to veriy

the gas tightness and pressure resistance or

gas-lled switchgear.

There is also the possibility o voluntarily

certiying switchgear or resistance to inter-nal arc aults and or personal protection.

Manuacturers and operators can select the

criteria which are relevant to them rom the

ollowing six criteria and have them tested.

Criterion 1:

Doors and covers must not open.

Criterion 2:

Parts o the switchgear must not fy o.

Criterion 3:

Holes must not develop in the external parts

o the enclosure.

Criterion 4:

Vertical indicators must not ignite.

Criterion 5:

Horizontal indicators must not ignite.

Criterion 6:Earth connections must remain eective.

In order to guarantee sae access to the

individual switchgear components, e.g.the

incoming cable, without isolating the busbar,

the IEC 60298 standard dierentiates bet-

ween three types o compartmentalization

that serve exclusively as protection against

electric shock.

Metal-clad switchgear: Division o the

switchgear panel into our compartments

(busbar compartment, switching-devicecompartment, connection compartment

and low-voltage compartment); partitions

between the compartments made o sheet

steel, ront plate made o sheet steel or

insulating material.

Compartmented switchgear: Division o

the switchgear panel same as or metal-clad

switchgear, but with the partitions between

the individual compartments made o insu-

lating material.

Cubicle-type switchgear: All other typeso construction that do not meet the above

eatures o the metal-clad or compartmented

designs.

In this context, access to the then common

minimum-oil-content circuit-breakers or

maintenance work without longer opera-

tional interruptions was o prime importance

because o the limited number o operating

cycles. Thereore, with switchgear in metal-

clad or compartmented design, the busbar in

the busbar compartment and the incom-

ing cable in the connection compartmentcould remain in operation. With a cubicle-

type design, the incoming cable had to be

isolated, but the busbar itsel could remain in

operation.

Retrospective

3


5/8

Although the old IEC 60298 standard

was very helpul, in time it was super-

seded by the technological progress.

Above all, the appearance o mainte-

nance-ree vacuum circuit-breakers,

with operating cycles ar exceeding

the normal number, made requent

access to this circuit-breaker no longer

o prime importance.

The vacuum arc-quenching principle

is technologically so superior to otherarc-quenching principles that the

circuit-breaker can be ixed-mounted

again. This resulted in the irst-time

use o gas insulation with the impor-

tant eatures o climatic independence,

compactness and maintenance-ree de-

sign. However, both technologies the

vacuum arc-quenching principle and

gas insulation were not adequately

taken into account in the existing

standard.

Thereore, at the end o the nine-ties, the responsible IEC committees

decided on the reormulation o the

switchgear standard, which inally

came into eect as IEC 62271-200 in

November 2003. At the same time the

old IEC 60298 standard was withdrawn

without any transition period.

Four key eatures are o special note with

the new IEC 62271-200 standard:

1. Changed dielectric requirements

According to IEC 60298, two disruptive

discharges were permitted in a series o

15 voltage impulses or the test with rated

lightning impulse withstand voltage. Ac-

cording to the new standard, the series

must be extended by another ve voltage

impulses i a disruptive discharge has oc-

curred during the rst 15 impulses. This canlead to a maximum o 25 voltage impulses,

whereas the maximum number o permis-

sible disruptive discharges is still two.

2. Increased demands on the circuit-

breaker and earthing switch

In contrast to the previous standard, the

switching capacity test o both switching

devices is no longer carried out as a pure

device test. Instead, it is now mandatory

to carry out the test in the corresponding

switchgear panel. The switching capacity

may get a negative infuence rom thedierent arrangement o the switchgear

with contact arms, moving contacts,

conductor bars, etc.

For this reason, the test duties T100s and

T100a rom the IEC 62271-100 standard

are stipulated or the test o the circuit-

breaker inside the switchgear panel.

3. New partition classifcation

The new partition classes PM (partitions

metallic = partitions and shutters made

o metal) or PI (partitions nonmetallic =partitions and shutters made o insulat-

ing material) now apply with respect to

the protection against electric shock dur-

ing access to the individual components.

The assignment is no longer according

to the constructional description (metal-

clad, compartmented or cubicle-type

design), but according to operator-related

criteria (Tables 1 and 2).

4. Stricter internal arc classifcation

Signicantly stricter changes have also

been implemented here. The energy fow

direction o the arc supply, the maximum

number o permissible panels with the

test in the end panel and the dependency

o the ceiling height on the respective

panel height have been redened. In

addition, the ve ollowing new criteria

must always be completely ullled (no

exceptions are permitted):

1) Covers and doors remain closed.

Limited deormations are accepted.

2) No ragmentation o the enclosure,

no projection o small parts above

60 g weight.

3) No holes in the accessible sides up

to a height o 2 meters.

4) Horizontal and vertical indicators do not

ignite due to the eect o hot gases.

5) The enclosure remains connected to

its earthing parts.

For the internal arc classication osubstations with and without control

aisle, the testing o the substation with

installed switchgear is mandatory in the

new IEC 62271-202 standard. The clas-

sication o the substation is only valid

in combination with the switchgear used

or the test. The classication cannot be

transerred to a combination with an-

other switchgear type as each switchgear

behaves dierently in the case o an in-

ternal arc (pressure relie equipment with

dierent cross-sections and pickup pres-

sures, dierent arcing conditions becauseo dierent conductor geometries).

New specications new challengesOverview o IEC 62271-200

4


6/8

Loss o servicecontinuity category

When an accessible compartment othe switchgear is opened:

Constructional design

LSC 1 then the busbar and thereorethe complete switchgear must beisolated.

No partitions within the panel, nopanel partition walls to adjacentpanels.

LSC 2 LSC 2A then the incoming cable must beisolated. The busbar and the adjacentswitchgear panels can remain inoperation.

Panel partition walls and i solatingdistance with compartmentaliza-tion to the busbar.

LSC 2B then the incoming cable, thebusbar and the adjacent switchgearpanels can remain in operation.

Panel partition walls and i solatingdistance with compartmentaliza-tion to the busbar and to the cable.

The notation IAC A FLR, I and t contains the abbreviations or the ollowing values:

IAC Internal Arc Classiication

ADistance between the indicators 300 mm, i.e. installation in rooms with access orauthorized personnel, closed electrical service location

FLR Access rom the ront (F), rom the sides (L = lateral) and rom the rear (R)

I Test current = rated shor t-circuit breaking current (in kA)

t Internal arc duration (in seconds)

Type o accessibilityto a compartment

Access eatures

Interlock-based Opening or normal operation andmaintenance, e.g. use replacement.

Access is controlled by theconstruction o the switchgear,i.e. integrated interlocks preventimpermissible opening.

Procedure-based Opening or normal operation andmaintenance, e.g. use replacement.

Access control via a suitable pro-cedure (work instruction o theoperator) combined with a lockingdevice (lock).

Tool-based Opening not or normal operation ormaintenance, e.g. cable testing.

Access only with tool or opening,special access procedure(instruction o the operator).

Nonaccessible Opening not possible / not intended or operator,opening can destroy the compartment.

This applies generally to the gas-illed compartments o gas-insulatedswitchgear. As the switchgear is maintenance-ree and climate-indepen-dent, access is neither required nor possible.

Table 2

Overview o the characteristic values

The IAC classication describes a success-

ul test. It results rom the denition o

the degree o accessibility, the possibili-

ties o arrangement inside a room, as

well as the test current and test time

(Table 3).

Medium-voltage switchgear in the pri-

mary and secondary distribution level is

generally classied with degree o acces-

sibility A. This means they are intendedor use in rooms that are only accessible

to authorized personnel (closed electrical

service locations).

Switchgear that is accessible by general

public has the degree o accessibility B

(distance o indicators = 100 mm) and

polemounted switchgear has the degree

o accessibility C (indicators below a

tower in an area o 3 x 3 m).

Consequences or operators

With the new IEC 62271-200 standard,the ollowing conditions must be satised

by the switchgear operators:

Already existing switchgear can still be

operated in accordance with IEC 60298.

However, new switchgear must ulll the

IEC 62271-200 standard in order to avoid

any resulting legal disadvantages. A situ-

ation which has a number o advantages.

For example, the comparison and evalu-

ation o switchgear eatures is now more

transparent. But also rom an economic

point o view, they are an investment inthe uture.

Table 1

Table 3

5


7/86

With intensive development work and

comprehensive tests, Siemens has al-

ready implemented the perormance

eatures requested by IEC 62271-200 at

an early stage. As one o the irst man-

uacturers, we oer the entire product

range o air- and gas-insulated switch-

gear or medium-voltage applications

in primary and secondary distribution

systems today type-tested according

to the new IEC 62271-200 standard.

A greater margin or your saety

Not only that: the more stringent require-

ments o the dielectric type tests have

been implemented without exception.

All switching capacity tests or the various

circuit-breakers and earthing switches

were perormed in installed condition,

i.e. inside the switchgear panel with the

associated arrangement o the conducting

path, contacts, etc. This means or you as

the operator: One hundred percent cer-

tainty that this combination o switchgearand switchgear panel unctions reliably.

All switchgear series were also tested or

the internal arc classication in accordance

with the new standard. The maximum

permissible number o test objects (gener-

ally two or three panels) as well as the

changed direction o energy fow o the arc

supply signicantly increased the demands

on the switchgear panels. All switchgear

certied in accordance with IEC 62271-

200 satises all ve criteria required or

the internal arc test without exception.

Siemens medium-voltage switchgear

thereore corresponds to the IAC A FLR

classication or short-circuit currents up

to 50 kA (depending on the system type)

and short-circuit times up to one second.

Ready or the uture with Siemens

With the ulllment o the new IEC 62271-

200 standard, all our switchgear types

represent the latest state o development

in technology, saety and reliability.

Without exception, Siemens switchgear

ullls the internal arc classication as vital

proo o the personal saety. Our switch-

gear thereore also meets the require-

ments o CAPIEL the European associa-

tion o national switchgear manuacturerassociations: This is now a type test and

not anymore subject o agreement be-

tween manuacturer and user.

An investment in the switchgear technol-

ogy made by Siemens is a protable invest-

ment in the uture.

With the successully veried internal arc

classication, IAC A FLR up to 50 kA and

one second arc duration, our switchgear

oers maximum possible personal protec-

tion. Our type-tested series also entirelyulll the specications o IEC 62271-200

in all aspects. In addition, they guarantee

the highest possible degree o operational

reliability and thereore an extremely low

ailure rate.

Air- and gas-insulated switchgearfrom Siemens in accordance withIEC 62271-200We are ready to make you ready as well


8/8

Overviewo

fSiemenss

witchgear

*Maximump

ossibleIA

Cclassiication

Distribution

level

Insula-

tion

Design

Lossoservicecon-

tinuity

Partition

class

Internalarcclassif-

cation*

S

witchgear

t

ype

Busbarsystem

Voltage

(kV)

Short-circuit

current(kA)

1s

3s

Ratedcurrent,

busbar(A)

Ratedcurrent,

eeder(A)

Primary

Gas-

insulated

Extendable

LSC2B(panels

withoutHVHRCuses)

LSC2A(panelswith

HVHRCuses)

PM

IACAFLR31,5kA,1s

NXPLUSC

Single

15

24

31,5

25

31,5

25

2500

2500

2500

2000

LSC2B(panels

withoutHVHRCuses)

LSC2A(panelswith

HVHRCuses)

PM

IACAFLR25kA,1s

NXPLUSC

Double

24

25

25

2500

1250

LSC2B

PM

IACAFLR31,5kA,1s

NXPLUS

Single

40,5

31,5

31,5

2500

2500

LSC2B

PM

IACAFLR31,5kA,1s

NXPLUS

Double

36

31,5

31,5

2500

2500

LSC2B

PM

IACAFL40kA,1s

8DA10

Single

40,5

40

40

4000

2500

LSC2B

PM

IACAFL40kA,1s

8DB10

Double

40,5

40

40

4000

2500

Air-

insulated

Extendable

LSC2B

PM

IACAFLR40kA,1s

NXAIR

Single

12

40

40

3150

3150

LSC2B

PM

IACAFLR40kA,1s

NXAIR

Double

12

40

40

3150

3150

LSC2B

PM

IACAFLR25kA,1s

NXAIRM

Single

24

25

25

2500

2500

LSC2B

PM

IACAFLR25kA,1s

NXAIRM

Double

24

25

25

2500

2500

LSC2B

PM

IACAFLR50kA,1s

NXAIRP

Single

15

50

50

4000

4000

LSC2B

PM

IACAFLR50kA,1s

NXAIRP

Double

15

50

50

4000

4000

LSC2B

PM

IACAFLR31,5kA,1s

SIMOPRIME

Single

17,5

31,5

31,5

3150

3150

LSC2A

PM

IACAFLR25kA,1s

8BT1

Single

24

25

25

2000

2000

LSC2B

PM

IACAFL31,5kA,1s

8BT2

Single

36

31,5

31,5

2500

2500

LSC1

PM

IACAFL16kA,1s

8BT3

Single

36

16

16

1250

1250

Secondary

Gas-

insulated

Non-

extendable

LSC2B(panels

withoutHVHRCuses)

LSC2A(panelswith

HVHRCuses)

PM

IACAFL21kA,1s

8DJ10

Single

17,5 2

4

25

20

20

20

630

630

630

630

LSC2B(panels

withoutHVHRCuses)

LSC2A(panelswith

HVHRCuses)

PM

IACAFL21kA,1s

8DJ20

Single

17,5 2

4

25

20

20

20

630

630

630

630

Extendable

LSC2B(panels

withoutHVHRCuses)

LSC2A(panelswith

HVHRCuses)

PM

IACAFLR21kA,1s

8DH10

Single

17,5 2

4

25

20

20

20

1250

1250

630

630

Air-

insulated

Extendable

LSC2B(panels

withoutHVHRCuses)

LSC2A(panelswith

HVHRCuses)

PM

IAC

AF

LR

20

kA,

1s

SIMOSEC

Single

17,5 2

4

25

20

11,5

20

1250

1250

1250

1250

the new switchgear standard

Documents