AdvertisingSheet 7ss52 En

7/27/2019 AdvertisingSheet 7ss52 En

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SIPROTEC 7SS52Distributed Busbar and

Circuit-Breaker Failure Protection


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SIPROTEC 7SS52:safe, reliable

and fast

Whether single or multiple busbars SIP RO TEC 7SS52

can be relied on for zone-selective protection, irrespective

of your substation configuration. By virtue of its ex-

tremely short operation time of less than 15 ms,

SIPROTEC 7SS52 busbar protection is faster than any

other system.

For this reason, SIP RO TEC 7SS52 is particularly suitable

in situations involving high fault levels where power

system stability is endangered or where bus zone-selective fault clearance is mandatory.

The advantages of the distributed solution

W hilst with centralized solutions for busbar protection,

the cable length between current transformer and

protection input is a determining factor for the burden

of the current transformer, with the distributed solution

the line length is reduced significantly, for example from

300 m down to 3 m. The shorter distances from the

current transformer result in a significantly lower burden

and thus better stability of the busbar differentialprotection. This is an advantage of special significance

in the light of constantly increasing fault capacity. Time

and money are saved during installation and cabling:

depending on substation configuration, up to 60 copper

cable strands per bay can be replaced by a single optical-

fiber pair. A t the same tim e, ease of traceability is

improved and the expense of commissioning significantly

reduced.

Circuit-breaker failureprotection

Irrespective of whether feeder

protection tripping is single or

three-pole, the built-in breaker

failure protection monitors the

circuit-breaker after tripping.

This function is embedded in

the range of functions of the

SIPR O TEC 7SS52.

Interference immu-

nity: clear separation

of the process level

from the electronics.

SelectiveIt is critically important for the

stability of the power system

for an entire region that,

in the case of a busbar fault,

strictly the faulty section is

cleared.

Safe

By linking three tripping

criteria, the measurement

algorithms incorporated can be

relied upon.

Reliable

All internal and external circuits

are continuously monitored for

availability.

Fast

Short fault clearance times are man-

datory for power system stability.

Here, with a release time of less

than 15 ms at the contact of

the tripping relay, the 7SS52

sets new standards within just

3 milliseconds from fault in-

ception, to distinguish between

internal and external faults. T he

circuit-breaker coils are triggered

directly by the tripping contacts.

Bus zone protection, selective,safe, reliable and fast thats whatthe SIPROTEC 7SS52 is all about

fastfast

selectiveselective

safesafe

reliablereliable


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Fastest communicationmeans of all: optical fiber

Fiber-optics are the most

efficient communication

media available today. We

have integrated them in

SIPRO TEC 7SS52. The entire

exchange of information

between master unit and bay

units takes place via optical

fibers.

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Ease of extension

If the substation is to be ex-

tended additional bay units

can also be connected sub-

sequently by the user himself.

Extension of the master unit

is just as simple: plug additio-

nal communication modules

in, adapt the configuration

with the operating program

provided and youre ready

to go!

Applicable onany busbar configuration

W hether it is intended for

single, duplicate or triplicate

busbars, with or without trans-

fer and with up to 48 bays,

4 ties, 24 sectionalizers and

12 busbar sections (i.e. for

whatever busbar configura-

tion), SIPR O TEC 7SS52 is of

modular construction, thus

permitting optimum matching

to the substation configura-tion involved.

A nd by virtue of the distri-

buted arrangement, the ex-

pense of multi-core cabling

between bay and substation

is significantly reduced.

Central

unit

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The proven measurement

method ensures maximum

stability, even under high fault

currents and current trans-

former saturation.

Selective detection of busbar

fault takes place on two

separate processor modules.

R eliability is increased still

further by incorporation of a

Check Zone . The decision

of all three processors is

necessary for tripping of a

busbar section.

A ssignment of the feeder

currents to the corresponding

busbar system is controlled

contactlessly by software

through the isolator mimic.

Setting and handling simplicity of use

With the aid of the integrated

operator panel of the master

unit or of a PC, entry of all

setting parameters is opera-

tor-controlled.

For convenience and ease of

setting, fault recording, fault

evaluation and commission-

ing, we additionally provide

an operator routine. Settings

at the bay units themselves

are not necessary. A ll settings

of the busbar or circuit-brea-

ker failure protection are ef-

fected solely at the master

unit. This makes operation

very much easier for you.

The keyboard and display orthe front-panel interface of

the bay units are used for

commissioning, display of

process values, diagnostics

and setting of special func-

tions (for example back-up

protection).

High-speed operationin every situation

The extremely short operation

times within a power system

cycle can be reliably main-

tained, even with the most

extensive substations.

Via ports to the PC:master and bay unit

The master unit incorporates

a serial port for operation viaPC. For diagnostic purposes,

a PC can be connected via

the front-panel port.

Interrogation local and remote

The master unit incorporates

an illuminated LC D display

and membrane keyboard for

local operation. U p to 32 LED s

and 34 alarm relays clearly

display the status of the sys-

tem at all times.

Available in two versions

There is a choice of two

housing variants: the flush-

mounting and the surface-

mounting version in the

standard 7XP20 housing. The

same applies to the master

unit: it is available as 19"

SIPA C m ounting rack for

cubicle mounting and in the

version for surface-mounting.

Both the master unit and the

bay units incorporate their

own power supply, the bayunits possessing a wide-

range power supply unit.

Measured value processing fully numerical

From sampling and digitiza-

tion of the measured values

to the decision to trip the

circuit-breakers the 7SS52

possesses a complete

numerical m easured-value

processing system.

Universality:

standard process

modules for

various applications

Flexibility:

ease of expandability

4848Bay

units


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Self-monitoring

for maximum availabilityHardware and software are

monitored continuously and

irregularities are detected and

signaled immediately.

The high level of reliability and

verification of availability are

achieved by continuous

monitoring of:

measuring circuits

trip circuits

analog-to-digital conversion

supply voltages

program memory

program execution and isolator position


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Standardized hardwareM inimum number of modules used

Minimized cost of sparesLess stock

Assistance during maintenance

as wellIntegrated test and service functions

(circuit-breaker trip test, bay shutdown)

Shorter inspection times

Active assistance during routine checks

or inspections

Customized status indicationIndividual assignment/labeling of

indicator LED s in master unit and bay

unit

Status indications at a single glance

Characteristic Advantage

FlexibilityD ecentralized, centralized or sum-

mated-phase layout of bay unit possible

Bereich

Energiebertragung und -verteilung

G eschftsgebiet Sekundrsysteme

P.O . Box 4806

D-90026 N uremberg

http://www.ev.siemens.de

Siemens Aktiengesellschaft

Powerto the

10 reasons for choosing SIPROTEC 7SS52

Central data managementA ll substation data are stored

in the master unit

Freedom of choiceLayout of bay unit to suit substation

conditions

Fully operable from master unitNo setting at bay unit necessary

Circuit-breaker failure protectionintegrated

C ircuit-breaker protection

can be configured to suit bay

Contacts for direct breaker tripping

Each bay unit provides

9 heavy duty contacts

Cost savingA ll necessary circuit-breaker protection

functions provided as standard

No repeat relays necessary

Commissioning assistance

Integrated, practical commissioning

aids in master unit and bay unit

Reduced commissioning time

Information in bay unit as well

D isplay of isolator contact positions,

feeder state and currents in bay unit

Decentralized information

also availableC lear display of bay state at a glance

Ease of expansion

A utomatic module recognition

Equipped for the future

addition of hardware modules

in master unit

simply reparameterize software

We have been

supplying numericalbusbar protection

for 10 years

S ubject to change w ithout prior notice O rder N o. E50001-U 321-A 115-X -7600

Printed in Germany

D ispo-Stelle 06200

61U1737 Vo/M 100427 PA 04983.

10 Years10 Years

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AdvertisingSheet 7ss52 En