1. EMFA 7.2kV-365kV Next Generation Actuator for Middle & High Voltage Circuit Breaker Head office : EMATECH San 56-1 Shillim-dong Kwanak-Gu Seoul Korea Phone : 82-2-875-0487 U.S. office : EMFA-LAB 3943 Irvine Blvd #113 Irvine blvd 92602 Phone : 1-714-418-7764 1-714-338-6197 20061016 EMATECH Co., Ltd. E LECTRO M AGNETIC F ORCE driving A CTUATOR

2. 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 breaker requires 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.

3. 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 Iron Core Main Permanent Magnet Auxiliary Permanent Magnet Sing Coil [ Cross section of EMFA ] [ Magnetic flux density on the iron core ] S-45 steel EMATECH Co., Ltd.

4. Next Generation Actuator (EMFA) EMFA series EMFA - I for 50kV class Vacuum Circuit Breaker SubjectEMFA -I Stroke8 – 60 mm Contact force1,000 – 10,000 N (3 phases) Energy20 – 46 Joules velocity open1.0 - 1.8 m/s close0.5 - 1.2 m/s EMFA - II for 72kV class Gas Circuit Breaker SubjectEMFA –II Stroke60 – 140 mm Repulsive gas Force 5,000 – 14,000 N (3 phases) Energy100 – 1,500 Joules velocity open2.5 - 4.6 m/s close1.5 - 2.6 m/s EMFA - III for 145kV class Gas Circuit Breaker SubjectEMFA –III Stroke100 – 200 mm Repulsive gas Force 20,000 – 60,000 N (3 phases) Energy1,500 – 15,000 Joules velocity open3.3 - 6 m/s close2.5 - 4 m/s EMATECH Co., Ltd.

5. 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 stroke Application 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 system Modern industrial design and use friendly Protection against pollution by electromagnetic type Enhancement self-diagnosis Anytime check the status of actuator stand-by state and its dynamic characteristics as well as electrode Controlling the velocity of the moving part during traveling Alarm the emergency state on the system to safety supervisor and consumer through the ubiquitous system EMATECH Co., Ltd. ●●●●●● ● ●●●● ●●●●●● ●●●●●●

6. Next Generation Actuator (EMFA) EMFA - I for Vacuum Circuit EMATECH Co., Ltd.

7. 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 size Higher 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 150 160 170 EMATECH Co., Ltd. ●●●● ●

8. Next Generation Actuator (EMFA) EMFA - III for Gas Circuit Breaker EMATECH Co., Ltd.

9. 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 size Higher 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 electrode Controlling 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. ●●●● ●●●●

10. 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 Open msec mm Close Power supply Main signal Control signal Signal from sensor Trip signal 00100 IO AC DC Charging Unit I/O Unit Converter Unit Capacitor Unit Actuator Resolver Control Unit EMATECH Co., Ltd.

11. 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 i i KEN Center 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. ●●●●

12. Seoul National University, Electro-mechanics Lab. EMATECH Elector-Magnetic Actuator Technology Co., Ltd. Head Office San 56-1(130-301) Shillim-dong Kwanak-Gu Seoul Korea, Phone : 82-2-875-0487 Fax : 82-2-875-0486 Website : http://www.ema21.com E-mail : ema21@ema21.com U.S. Office (EMFA_LAB) 3943 Irvine Blvd #113 Irvine blvd 92602 Phone : 1-714-418-7764, 1-714-338-6197 E-mail : briankim@emfa-lab.com Research Center San 56-1(301-614) Shillim-dong Kwanak-Gu Seoul Korea Phone : 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.