electro mecanica, typevd-gsmi 34.5kv vacuum breaker & grounding breaker -(interlocked)

COMBINED 34.5 KV VACUUM CIRCUIT BREAKER & GROUNDING BREAKERMECHANICALLY INTERLOCKED ‘VDH/GSMI’ SERIES

ELECTROMECANICA

Innovative Switching & Groundingof Wind Collection Circuits

VDH/GSMITM

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ELECTROMECANICA

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ELECTROMECANICA

EMA Electromecanica S.A. now offers model VDH/GSMI 38 kV class, high speed grounding switch which eliminates the need of Grounding Transformers on wind farm collection systems.

The complete assembly provides 200 kV BIL and is available at 1200 & 2000 A ratings, manufactured and tested to meet ANSI C37 and IEC 62271-100 standards.

VDH/GSMI: The Switch

VDH/GSMI model combines a vacuum circuit breaker with a high-speed, mechanically-interlocked grounding breaker within the same outdoor enclosure.

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ELECTROMECANICA

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ELECTROMECANICA

VDH/GSMI Electrical Ratings

34.5

KV

Rated

Voltage

3412.5------Grounding

Breaker

60

68

85

106

25

31.5

40

25

31.5

40

1200

200038

Circuit

Breaker

HzkAkA (3 sec)kAAKV

Rated

Frequency

Making

Capability

(Peak)

Short Time

WhitstandCurrent

Symmetrical

InterruptingCapability

Rated

ContinuousCurrent

Rated

MaximumVoltage

80

kV

Dielectric

Strength

Withstand 60

Hz-1 min

---------Grounding

Breaker

1212 to 16

4 to 113040

200

Circuit

Breaker

msecmsecmsecmsecmseckV

Maximum

Electrical

Switching

Time

Rated

Mechanical

Switching

Time

Rated Arcing

Time

Rated

Opening

Time

Rated

Closing Time

Dielectric

Strength

Impulse Full

Wave (BIL)

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ELECTROMECANICA

mminchesDimension

147.6

70.9

70.9

C

B

A

3750

1800

1800

C

BA

Dimensions & Weight

kgpounds

4070Weight 1850

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ELECTROMECANICA

Enclosure is metal enclosed, self-supporting and free standing construction, with weatherproof design suitable for installation in an unprotected environment.

All exterior parts fabricated from steel sheet with an electro-chemical process as anticorrosive protection which provides longlasting perfomancein corrosive or contaminated environments.

Design Characteristics

Roof assembly specifically fabricated in aluminium to prevent eddy currents around bushings.

Easy installation and accessibility, minimal maintenance and long service life.

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ELECTROMECANICA

Front View (without door) / Main Components

Connector

Bushing

Control Push-Buttons& Indicating Lamps

Supporting Frame

Operating & CommutationMechanism

Grounding Bar

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ELECTROMECANICA

Section View / Main Components

Connector

Bushing

Current Transformer

Operating & CommutationMechanism

Vacuum Circuit Breaker

Main Busbars

Mechanical Interlock

Vacuum Grounding Breaker

Supporting Frame

Auxiliary & Terminal BlocksCompartment

Grounding Bar

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ELECTROMECANICA

The Main Breaker & Grounding Breaker Unit

Vacuum interrupters manufactured by EATON

Three-pole double vacuum circuit breaker “VED”series manufactured by EMA

Operating mechanism with stored energy springoperated device

Main breaker (upper vacuum interrupters) connectsgenerator collection circuits to the transformer bus

High speed, mechanically interlocked groundingbreaker (lower vacuum interrupters) connectscollection circuits automatically to ground

Complete switching sequence (time duration foropening main breaker through closing groundingbreaker) is mechanically accomplished in less than 1 cycle @ 60 Hz (between 12 to 16 milliseconds), with a maximum electrical switching of 12 milliseconds.

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ELECTROMECANICA

Switching Oscillogram

In this oscillogram, channel 1 is the analog representation

of the main breaker contact traveling, while channel 2 is

the representation of the contact mechanical positions of

both main breaker and grounding breaker, connected in a

parallel circuit.

This shows that complete switching sequence (time

duration for opening circuit breaker thru closing grounding

breaker) was accomplished in 14.76 msec, and the main

breaker contact traveled more than 75% of its total stroke

when the grounding breaker closed.

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ELECTROMECANICA

Bushings

Standard creepage distance 31 mm/kV

Cycloaliphatic epoxy resin or Porcelain type

Dimensions suitable to fit up to 2 CT’s per phase

Designed for very heavy pollution levels

Extra creep bushings optionally available

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ELECTROMECANICA

Bushing Current Transformers

Cast resin or tape wrapped type

600 V insulation level

Single or multi ratio

Relaying or metering type

Quantity, ratio and accuracyaccording to project requirements

Installed around the bushings on theunderside of the roof

Shorting terminal blocks forsecondary terminations located in theauxiliary compartment of the enclosure

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ELECTROMECANICA

VDH/GSMI: Advantages, Features and Benefits

Typically over $40,000 per circuit first cost savings

Advantages, features and benefits of use of the VDH/GSMI model as compared to grounding transformer + conventional substation breaker include:

Elimination of grounding transformers core losses which saves substantial $ overproject life

Lower procurement lead times

Lower time required to install

Lower installation labor & material costs

Higher MTBF (Mean Time Between Failures)

Lower MTTR (Mean Time To Repair)

Typically better delivery times

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ELECTROMECANICA

U.S. Wind Projects / Service Backup

Over sixteen (16) large U.S. wind projects are now utilizing EMA Grounding Switches for their collection circuits, located in:

Texas

Wisconsin

Oregon

California

EMA Electromecanica S.A. maintains a Service Agreement with National Switchgear Systems Inc. located at Lewisville, TX, to provide 24/7 USA parts and service backup.

Kansas

New York

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electro mecanica, typevd-gsmi 34.5kv vacuum breaker & grounding breaker -(interlocked)

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