Dongguan 2016 Houjie Office Electrician Certificate Agency Review

The voltage value that each phase winding withstands when the voltage is started. Motor - △Reduced voltage start means that the circuit first controls the connection and shaping of the motor's stator windings to enter the reduced voltage operating state. In this method, the voltage endured by the stator windings of each phase of the motor is the same. After the motor speed reaches a certain value, the circuit controls the stator windings. Change the connection into a △ shape so that the voltage of each phase stator winding of the motor is the same. After that, the motor enters the normal (full voltage) operating state. It is the voltage value that each phase winding withstands when the motor resistor starts to reduce the voltage. The motor resistor voltage reduction starting refers to the use of a series resistor to reduce the voltage and current limit when the motor is started


Contact person: Teacher Li
Consultation phone number: < br/> <> <>
School name
: Dongguan Guangyou Vocational Training School
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Address: Dongguan Bus Terminal East Station 3 Building (Guangyou Education)
Guangyou Vocational School opens classes all year round
Learn electricians and provide electrician exam practice software
Guangyou Education
Training goals
: Start from scratch Comprehensively guide students on how to connect indoor and outdoor wires, emergency first aid and treatment of electrician field operations and theory combined with safe operations, on-the-job operations and employment experience exercises
Specific electrician training course introduction:
Junior electrician training course introduction:< br/>Safe operation for electricians
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Basic knowledge of electrical circuits
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Calculation of circuits
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Serial, parallel and application of resistors
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AC, DC
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Single-phase AC, three-phase AC
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Transformer, mutual inductor
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Single-phase Electricity meter, three-phase electricity meter
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Motor
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Use of electrical instruments
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Multimeter
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Megohmmeter
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Current clamp meter
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Ammeter
.
Voltmeter
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Application of low voltage electrical appliances
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Fuse
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Knife switch
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Circuit breaker
.
Contactor
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Thermal relay
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Intermediate relay
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Time relay
.
Button
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Lighting circuit practical operation
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Practical operation of industrial power circuit
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Motor forward rotation control
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Motor interlocking forward and reverse rotation control circuit
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Double interlocked forward and reverse control circuit
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Workbench automatic reciprocating control circuit
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Motor sequential start control circuit
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Motor lowering Voltage starting control circuit
Intermediate electrician training course training content: electrical control technology, electrician and electronic basics, maintenance electrician technology, internal and external line electrician
Technology,
Electrical equipment operation,
Principles and applications of programmable controllers for operation and maintenance of transformers and motors,
electrical
electrical measurement knowledge, practical operations and other advanced training contents: digital circuit technology, factory power transformation and distribution technology, factory
Electrical control technology,
Principle and application of programmable controller,
Principle and practical technology of microcontroller,
Rectifier and
inverter technology, principle and application technology of frequency converter, practical operation, etc.
With the continuous updating of technology, soft starters have gradually replaced the traditional hard starting method. The soft starter also uses a step-down starting method. Different from the traditional step-down starting method, the soft starter adopts stepless voltage starting. It has a built-in voltage regulating device to slowly increase the starting voltage of the motor from zero to the rated value within a specified period of time. Voltage. This is the functional schematic diagram of the soft starter. The voltage regulating device built into the soft starter is actually a thyristor voltage regulating circuit. By changing the conduction angle of the thyristor, the output voltage of the soft starter is adjusted. As the output voltage of the soft starter gradually increases, the speed of the motor also gradually increases. Gate