EMFA 7.2kV-365kVNext Generation Actuator

for Middle & High Voltage Circuit Breaker

Head office : EMATECHSan 56-1 Shillim-dongKwanak-Gu Seoul KoreaPhone : 82-2-875-0487

U.S. office : EMFA-LAB3943 Irvine Blvd #113Irvine blvd 92602Phone : 1-714-418-7764 1-714-338-6197

20061016

EMATECH Co., Ltd.

ELECTRO

MAGNETIC

FORCE driving

ACTUATOR

ELECTRO

MAGNETIC

FORCE driving

ACTUATOR

EMFA has a characteristic of one of the electrical actuator with a moving coil, because it can satisfy the requirements of high voltage circuit breaker extremely well for large stroke length and high power. Besides, EMFA is possible to attach it in a small spacer due to having a compact volume.

EMFA is developed and designed by Seoul National University, Electro-mechanics Lab.

Next Generation Actuator (EMFA)What is EMFA

Rail-gun type

The worldwide first electric actuator for high voltage circuit

breaker

Patent : Seoul National University, Electromechanics Lab.

EMFA (Electro-Magnetic Force driving Actuator) is designed for mechanism drive of middle & high voltage circuit breaker. The high voltage circuit breakerrequires the actuator to be capable of carrying extremely high power during a long stroke length and short breaking time. However pneumatic, hydraulic, spring and permanent magnetic actuator are considered expensive, nosily and are not used wide.

EMFA-III[for Gas Circuit Breaker]

EMFA-I[for Vacuum Circuit Breaker]

EMATECH Co., Ltd.

Next Generation Actuator (EMFA)Basic structure

Planner and tubular type

Coil moving type actuator

Latch itself using by auxiliary permanent magnet

4 parts

- laminated iron core, permanent magnet, inserted iron core, coil

[ Structure of EMFA ]

Inserted IronCore

Main PermanentMagnet

Auxiliary PermanentMagnet

Sing Coil

Station iron coreStation iron coreStation iron core

[Cross section of EMFA ]

[Magnetic flux density on the iron core ]

S-45 steel

EMATECH Co., Ltd.

Next Generation Actuator (EMFA)EMFA series

EMFA - I for 50kV class Vacuum Circuit Breaker

Subject EMFA -I

Stroke 8 – 60 mm

Contact force 1,000 – 10,000 N (3 phases)

Energy 20 – 46 Joules

velocityopen 1.0 - 1.8 m/s

close 0.5 - 1.2 m/s

EMFA - II for 72kV class Gas Circuit Breaker

Subject EMFA –II

Stroke 60 – 140 mm

Repulsive gas Force 5,000 – 14,000 N (3 phases)

Energy 100 – 1,500 Joules

velocityopen 2.5 - 4.6 m/s

close 1.5 - 2.6 m/s

EMFA - III for 145kV class Gas Circuit Breaker

Subject EMFA –III

Stroke 100 – 200 mm

Repulsive gas Force 20,000 – 60,000 N (3 phases)

Energy 1,500 – 15,000 Joules

velocityopen 3.3 - 6 m/s

close 2.5 - 4 m/s

EMATECH Co., Ltd.

Next Generation Actuator (EMFA)Advantages of EMFA

High reliability

Small space and volume requirements

This circuit breaker, adapted EMFA, is passed on KERI according to new revised IEC standards (IEC 60517 & IEC 62271-100)Compact size in minimized number of components and high power during long strokeApplication of circuit breaker by high quality EMFA without any mechanical components

Small size and light weight resulting from variable circuit breaker type

High security

No need latch mechanism (Hold the electrode position by itself)Optimum operation through extendible increasing or decreasing rated capability

Outstanding harmony of the environment

Lower noise by adapting magnetic systemModern industrial design and use friendlyProtection against pollution by electromagnetic type

Enhancement self-diagnosis

Anytime check the status of actuator stand-by state and its dynamic characteristics as well as electrodeControlling the velocity of the moving part during travelingAlarm the emergency state on the system to safety supervisor and consumer through the ubiquitous system

EMATECH Co., Ltd.

●

●

●

●

●

●

●

●

●

●

●

●

Next Generation Actuator (EMFA)

EMFA - I for Vacuum Circuit

EMATECH Co., Ltd.

Patented system with better performance than Motor Spring

Actuator and Permanent Magnetic Actuator

Ability to vary speed and self-adjust time according to the

environment, programmable and maintenance-free

Smaller than 30% volume sizeHigher energy efficiency 40% over other electrical actuators

Much more dependable and less prone to breakage and failure

Only one component working to opening or closing the electrodes

Enhancement the maintenance-free system

Uses far less energy than other electrical actuators

Next Generation Actuator (EMFA)

General Features of EMFA - I for Vacuum Circuit Breaker

150160

160 170

EMATECH Co., Ltd.

●

●

●

Next Generation Actuator (EMFA)

EMFA - III for Gas Circuit Breaker

EMATECH Co., Ltd.

The worldwide first electric actuator for high voltage circuit

breaker (IEC 60517 & IEC 62271-100)

Patented system with better performance than Motor Spring

Actuator and Hydraulic Actuator

Smaller than half of volume sizeHigher energy efficiency 40% over other electrical actuators

Ability to vary speed and self-adjust time according to the

environment, programmable and maintenance-free

Enhancement self-diagnosis

Anytime check the status of actuator stand-by state and its dynamic characteristics as well as electrodeControlling the velocity of the moving part during traveling

Next Generation Actuator (EMFA)

General Features of EMFA - III for Vacuum Circuit Breaker

220

250

430 220

EMATECH Co., Ltd.

●

●

●

●

EMFA is controlling the electrodes during its working on opening

or closing by adapting DC/DC converter

EMFA driver system is very sensitive as well as actuator itself, due

to high efficiency

Next Generation Actuator (EMFA)

EMFA control system

Stroke Curve of EMFA

Openmsec

mm

Close

Power supply

Main signal

Control signal

Signal from sensor

Trip signal

00100I O

AC

DC

ChargingUnit

I/OUnit

ConverterUnit

CapacitorUnit

ActuatorResolver

ControlUnit

EMATECH Co., Ltd.

Increasing management of Power System through the networking

system

Next Generation Actuator (EMFA)

Information Technology on Power system

By adapting power system total solution, consumption administer and security of power system as well as supplying company

High quality power can be supplied to consumers

Communication Relay System

ii KEN Center

LAN

LAN

Security of Power System

Consumption Administer

CB

Distribution System

Local

Optical Communication

Global

Optical Communication

Fire wall

C/S server

Monitoring

B/L server DB server

Web server

EMATECH Co., Ltd.

●

●

Seoul National University, Electro-mechanics Lab.

EMATECHElector-Magnetic Actuator Technology Co., Ltd.Head OfficeSan 56-1(130-301) Shillim-dong Kwanak-Gu Seoul Korea, Phone : 82-2-875-0487 Fax : 82-2-875-0486Website : http://www.ema21.comE-mail : ema21@ema21.com

U.S. Office (EMFA_LAB)3943 Irvine Blvd #113 Irvine blvd 92602Phone : 1-714-418-7764, 1-714-338-6197 E-mail : briankim@emfa-lab.com

Research CenterSan 56-1(301-614) Shillim-dong Kwanak-Gu Seoul KoreaPhone : 82-2-880-7262 Cel : 82-11-1783-8637 Fax : 82-2-878-1452 Website : http://elecmech.snu.ac.kr E-mail : feelfree@elecmech.snu.ac.kr

Copyright 2007 EMATECH Co., Ltd. All rights reserved.ⓒ

EMATECH Co., Ltd.