There are several types of electrician employment certificates for Dalang Electrician Training in Dongguan 2016

The main symptoms after a short-circuit fault are severe heating and abnormal secondary winding output voltage. Generally, the more inter-turn short-circuit points inside the coil, the greater the short-circuit current and the more serious the transformer heating. A simple way to detect and determine whether the power transformer has a short-circuit fault is to measure the no-load current (the test method has been introduced previously). For a transformer with a short-circuit fault, its no-load current value will be much greater than % of the full-load current. When the short circuit is serious, the transformer will heat up rapidly within tens of seconds after no-load power-up, and the iron core will feel hot when touching it with your hands. At this time, it can be concluded that there is a short circuit point in the transformer without measuring the no-load current.
Contact
Teacher Li
Consultation phone number
br/>School name
Dongguan Guangyou Vocational Training School
Place
Addressed on the third floor of Dongguan Bus Terminal East Station (Guangyou Education)
Guangyou Vocational School is open all year round
,
Learn electrician and provide electrician exam practice software
Guangyou Education
Training objectives
Start from zero basics, guide students in all aspects, how to connect indoor and outdoor wires, emergency first aid and treatment of electric shock, electrician field operation and theory, safe operation, on-the-job operation and employment experience practice< br/> Introduction to specific electrician training courses
Introduction to junior electrician training courses
Safe operation of electricians
Basic knowledge of electrical circuits
Calculation of circuits
Series and parallel connections of resistors and applications
AC, DC
Single-phase AC, three-phase AC
Transformers, mutual inductors
Single-phase meters, three-phase meters
Electric motors
Electrical instruments The use of
Multimeter
Megohmmeter
Current clamp meter
Ammeter
Voltmeter
Application of low voltage electrical appliances
Fuse
Knife switch
Circuit breaker
Contactor
Thermal relay
Intermediate relay
Time relay
Button
Lighting circuit practical operation
Industrial power circuit practical operation
Motor forward rotation control
Motor interlocking forward and reverse rotation control circuit
Double interlocking forward and reverse rotation control circuit
Workbench automatic reciprocating control circuit
br/>Motor sequential start control circuit
Motor reduced voltage start control circuit
Intermediate electrician training course training content electrical control technology, electrician and electronic basics, maintenance electrician technology, internal and external line electrician
Technology Learning,
Electrical equipment operation,
Transformer and motor operation and maintenance, programmable controller principles and applications,
Electrical
knowledge of electrical measurement, practical operations, etc., advanced training content digital circuit technology , Factory power transformation and distribution technology,
Factory electrical control technology,
Principle and application of programmable controller,
Principle and practical technology of single chip microcomputer,
Rectifier and inverter
Transformer technology, frequency converter principle and application technology, practical operation, etc.
The structure has a certain inductance at high frequencies. Its impact on the circuit is equivalent to adding an inductor in series to the circuit. This inductance value is the distributed inductance. . According to the frequency characteristics of the inductor mentioned above, we can know that since the value of distributed inductance is generally small, in low-frequency AC circuits, the inductive reactance of distributed inductors is very small and has little impact on the circuit. Therefore, in low-frequency AC circuits, , generally the influence of distributed inductance can not be considered, but for high-frequency AC circuits, the influence of distributed inductance cannot be ignored. Distribution parameters (distributed capacitance and distributed inductance) of wire-wound precision resistors and potentiometers. Since wire-wound precision resistors and potentiometers have distributed parameters, wire-wound precision resistors