Dongguan 2016 Dalang Electrical Circuit Breaker teaches you how to use it for training

Finally, connect the two pins of the inductor to the two test leads, and the inductance of the inductor can be displayed on the display. If the displayed inductance is much different from the nominal inductance, it means there is something wrong with the inductor. If the displayed inductance is similar to the nominal inductance, it means the inductor is normal. If the displayed inductance is close to the nominal value, it should be noted that when testing the inductor, the range selection of the digital meter is very important. It is best to choose a range close to the nominal inductance to measure, otherwise, the test results will be different from the The actual value has a large error. For example, the capacitance and inductance digital meter shown in the figure has a measurement range of / and an error of .%. There are two types of iron cores in commonly used power transformers: shape and shape. The shaped iron core transformer has a shell structure (the iron core wraps the coil), using high-quality silicon steel sheets as the iron core, and is widely used. The shaped iron core transformer uses cold-rolled silicon steel strip as the iron core, which has small magnetic leakage, small size, and a core structure (the coil wraps the iron core). ． Identification from the number of winding terminals Commonly used power transformers have two windings, one primary and one secondary winding, so there is a terminal. Some power transformers are designed to prevent hum and other interference

Contact
Teacher Li
Consultation phone number
br/>School name
Dongguan City Guang You Vocational Training School
Location
Address: Third Floor, Dongguan Bus Terminal East Station (Guangyou Education)
Guangyou Vocational School is open all year round
,
Learn Electrician Send electrician exam practice software
Guangyou Education
Training goals
Starting 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 combined , safe operation, on-the-job operation and employment experience practice
Introduction to specific electrician training courses
Introduction to junior electrician training courses
Safe operation of electricians
Basic knowledge of electrical circuits
Circuits Calculation
Serial, parallel and application of resistance
Alternating current, direct current
Single-phase alternating current, three-phase alternating current
Transformer, mutual inductor
Single-phase electricity meter, three-phase electricity meter
Electric motor
The use of electrical instruments
Multimeter
Megohmmeter
Current clamp meter
Ammeter
Voltmeter
Low voltage electrical appliances Applications
Fuses
Knife switches
Circuit breakers
Contactors
Thermal relays
Intermediate relays
Time relays
Buttons
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
Motor sequential start control circuit
Motor voltage starting control circuit
Intermediate electrician training course training content electrical control technology, electrician and electronic basics, maintenance electrician Technology, internal and external electrical engineering
Technology,
Electrical equipment operation,
Transformer and motor operation and maintenance, programmable controller principles and applications,
Electrical
Electrical measurement knowledge , practical operation, etc., advanced training content digital circuit technology, factory power transformation and distribution technology, factory electrical control technology,
programmable controller principle and application,
single chip microcomputer principle and practical technology,
Rectifier and inverter
Inverter technology, frequency converter principle and application technology, practical operation, etc.
to check whether there are any obvious abnormalities. For example, whether the coil leads are broken or desoldered, whether the insulation material has scorch marks, whether the iron core fastening screw is loose, whether the silicon steel sheet is rusted, whether the winding coil is exposed, etc. For insulation testing, use a multimeter to measure the resistance values between the iron core and the primary, the primary and each secondary, the iron core and each secondary, the electrostatic shielding layer and the primary and secondary windings. The multimeter pointer should all point at the infinity position. move. Otherwise, the insulation performance of the transformer is poor. (You can also use a megohmmeter, commonly known as a megohmmeter)