EE064D: Circuit Breakers & Switchgears: Design, Testing, Commissioning, Maintenance, Repair & Troubleshooting

Transcription

1 EE064D: Circuit Breakers & Switchgears: Design, Testing, Commissioning, Maintenance, Repair & Troubleshooting EE064-D Rev.002 CMCT COURSE OUTLINE Page 1 of 7

2 Training Description: This intensive five-day training is designed to update participants with the latest development of Circuit Breakers and to present some of the more common and updated aspects of low, medium and high voltage switchgear maintenance. It must be understood that there is an incredible variety of equipment used on low, medium and high voltage switchgear today. Switchgears play an important role in the distribution and control of electrical power in manufacturing or power plant and in a utility distribution system. Negligent maintenance practices can lead to power system inefficiency and loss of system reliability. An older plant may have switchgear that was built in the forties in the older areas and modern switchgear in other areas as the plant was upgraded. This course will present maintenance problems to the maintenance manager and technician. Newer plants will have the modern equipment of a limited variety and manufacture. It is these similarities that will be covered in the course. Training Objective: By the end of the training, participants will be able to: Design, inspect, maintain, repair and troubleshoot circuit and switchgears Apply an in-depth knowledge and skills on LV/MV/HV circuit breakers and switchgears Describe switchgear details such as ratings, degree of protection, service conditions and ancillary equipment Explain switchgear asset management including CBM and RCM process, tripping devices, maintenance and testing Apply load and fault calculation to decide the task of protection system and the operating conditions of power system Explain circuit breaker control circuits, types and application of protective relays, structure of control circuits and the use and application of current and voltage transformers Discuss circuit breaker characteristics in relation to protection control circuits, selectivity, sensitivity and speed of the control circuits Recognize the value of earthing system to protection control circuits and the power system protection as well as fault clearance and power redundancy through control system application Identify the various switchgear diagnostic techniques and employ the different types of substation circuit breaker techniques and determine the switchgear vital equipments including batteries condition and monitporing, relay applications for basic complex busbar arrangement and zone selection logi Employ substation maintenance techniques and discuss their description, structures, features and fucntions Apply the switchgear maintenance practices and improve maintenance and repair procedures Carryout maintenance work orders including their process development, procedures and problems encountered Introduce computerized maintenance management systems (CMMS) and recognize its importance in circuit breaker design, inspection, maintenance, repair and troubleshooting EE064-D Rev.002 CMCT COURSE OUTLINE Page 2 of 7

3 Training Designed for: This course is intended for all Engineers and other Technical Staff who need a sound understanding of Low, Medium and High Voltage Switchgear and Circuit Breaker design, inspection, maintenance, repair and troubleshooting. Training Program: DAY ONE: PRE-TEST INTRODUCTION Electrical engineering basic concepts Three phase review and per unit Voltage levels One line and three-line diagram Generation system layout Transmission system layout Substation system layout Distribution system layout INDUSTRIAL SWITCHGEARS Fuses Auto-reclosers Automatic sectionalizer Circuit Breakers Isolator switches Load switches Relays Current transformers Voltage transformers DAY TWO: INSTALLATION AND COMMISSIONING OF CIRCUIT BREAKERS CB DESIGN SPECIFICATION BASED ON SHORT CIRCUIT CURRENT LEVEL Per unit system Faults on power systems Transient phenomena in power system Symmetrical component analysis of three phase network Network connection for various fault types Current and voltage distribution in system due to a fault Effect of system on zero sequence quantities Computer programs based short circuit calculation Installation and Commissioning EE064-D Rev.002 CMCT COURSE OUTLINE Page 3 of 7

4 CB DESIGN SPECIFICATION BASED ON ARC PHENOMENA AND CIRCUIT INTERRUPTION Arc phenomena Maintenance of the Arc Properties of Arc Arc Interruption theory Circuit Breaker Rating Circuit constants and circuit conditions Conditions of severity Restriking voltage transient Class A ultrafast transients Class B system transients Class C low transients Transmission line transient Switching transients Duties of Switchgear DAY THREE: LV CIRCUIT BREAKERS Low voltage molded case current limiting circuit breakers Low voltage molded case circuit breakers with high breaking capacity Insulated case circuit breakers Low voltage air circuit breakers Low voltage circuit breakers specification MODERN MV AND HV VACUUM CB Introduction Advantages of vacuum interruption Vacuum contactors and interrupters The vacuum medium The vacuum arc Vacuum arc stability Vacuum break down Vacuum switch construction Applications of vacuum circuit breakers MODERN MV AND HV SF6 CB INTRODUCTION Basic Features of SF6 Breakers Dielectric properties of SF6 Quenching properties of SF6 Construction of SF6 breaker SF6 CB types Puffer type SF6 breakers Double Pressure System Single Pressure Puffer-Piston System EE064-D Rev.002 CMCT COURSE OUTLINE Page 4 of 7

5 Single Pressure Self Blast System Improvement in SF6 Breakers for HV DAY FOUR: OTHER TYPE OF CIRCUIT BREAKERS Air Circuit Breakers o Method of increasing arc resistance o Plan break type o Magnetic blow out type o Arc splitter type o Application o Construction and operation o Axial air CB o Blast air CB Oil Circuit Breakers o Arc rupture under oil o Advantages of oil o Disadvantages of oil o Plan break oil circuit breakers o Arc control circuit oil breakers o Minimum oil circuit breakers o Construction and operation DC Circuit Breakers o Construction o Methods of interruption o Application DAY FIVE: CIRCUIT BREAKER INSPECTION, MAINTENANCE AND SERVICES Inspection General inspection technical procedure Daily inspection of circuit breakers Annual inspection of circuit breakers Disassembly Cleaning Tightening Lubrication Equipments used in testing Testing procedure Direct testing Contact resistance test Insulation resistance test EE064-D Rev.002 CMCT COURSE OUTLINE Page 5 of 7

6 Test report Indirect testing One-hour Video, HV CB Maintenance and Repair CIRCUIT BREAKERS CONTROL, PROTECTION AND TESTING Switchgears control devices and wiring Switchgears protection devices and wiring Testing Classification Testing laboratories Description of a simple testing station CB TROUBLESHOOTING Low insulation Resistance (below 2000 Mega-ohms) between a) Phase terminal and earthed frame, with breaker closed b) Phase terminals of a pole Resistance between Termi nals of Pole too high (above 100 microhms) (15 micro-ohm per joint) contact Unequal contact Wipe and Travel in 3-pole Measured from top surface of inter rupter flange and the contact lip by a simple rod with a) breaker open and b) breaker closed One of the pole docs not close Breaker operation too Slow During opening timing from trip command to contact separation instant too large (60 ms instead of say 40 ms) Course Conclusion POST-TEST and EVALUATION Training Requirement: Hand s on practical sessions, equipment and software will be applied during the course if required and as per the client s request. Training Methodology: This interactive training course includes the following training methodologies as a percentage of the total tuition hours: - 30% Lectures, Concepts, Role Play 30% Workshops & Work Presentations, Techniques 20% Based on Case Studies & Practical Exercises 20% Videos, Software & General Discussions Pre and Post Test Training Certificate(s): Internationally recognized certificate(s) will be issued to each participant who completed the course. EE064-D Rev.002 CMCT COURSE OUTLINE Page 6 of 7

7 Training Fees: As per the course location - This rate includes participant s manual, hand-outs, buffet lunch, coffee/tea on arrival, morning & afternoon of each day. Training Timings: Daily Timings: 07:45-08:00 Morning Coffee / Tea 08:00-10:00 First Session 10:00-10:20 Recess (Coffee/Tea/Snacks) 10:20-12:20 Second Session 12:20-13:30 Recess (Prayer Break & Lunch) 13:30-15:00 Last Session For training registrations or in-house enquiries, please contact: Aisha Relativo: aisha@cmc-me.com Tel.: or Mob.: Training & Career Development Department EE064-D Rev.002 CMCT COURSE OUTLINE Page 7 of 7