What is protection selectivity?
What is the selectivity of protection of the electrical network. The main functions and types of selectivity of protection in electrical installations. An example of a selectivity map.
Electrical equipment
Please specify the section:
Automata and RCD
Relays, contactors, sensors
Electric motors
Electric meters
What is relay protection and what is it for?
Purpose of relay protection and basic requirements for it. Find out what RPA consists of and where it is used in energy.
How many machines to put in the electrical panel: calculation rules
How to calculate the number of machines in the electrical panel of a private house or apartment, as well as what the PUE says about this. Correct calculation of the number of circuit breakers.
Is it legal to demand the removal of the electric meter to the street
In the private sector, SNT, as well as in garage cooperatives, they are faced with the requirement to take the electric meter to the street. Find out if the requirement to move an electricity meter is legal.
What types of electricity meters are there?
Types of electricity meters for home or apartment, as well as for accounting of active and reactive energy in AC and DC networks. Where different types of meters are used.
Methods and schemes for braking electric motors
Motor braking is used when necessary to quickly stop the actuator. The article discusses braking modes and braking methods.
Overview of the multifunctional protection device UZM-50TSM
Let's consider what UZM-50TSM is, its technical characteristics, connection diagram, and also what this device protects from. Advantages and disadvantages of the UZM-50TSM from Meander.
What is asynchronous motor slip
The slip of an induction motor characterizes the lag of the rotor from the stator field. What it is, how it differs in different operating modes and how to measure the slip, read the article.
Decoding of marking of electric motors of domestic and import
The structure of the marking and designations of domestic engines such as AIR and foreign Siemens and their interpretation. Designation of the ends of the windings in brno.
The main types of tests of induction motors
Before commissioning or after repair, various tests of asynchronous motors are carried out. Test methods and standards are described in the article.
Conventional graphic designation of electric motors in the diagram
UGO of asynchronous, synchronous, collector and other types of motors according to GOST 2.722.The article gives the correct designation of electric motors in the diagrams.
Overview of VA 47-63 EKF PROxima circuit breakers
What is the difference between VA 47-63 EKF PROxima circuit breakers, what are their features and advantages. Overview of the design of modular automatic machines EKF PROxima.
What affects the life of the electric motor and how to extend it
What determines the life of an electric motor and how to extend it? In which GOST and regulations are described the requirements for the selection and operation of electric motors.
What are the brushes for electric motors and how are they marked
Decoding marking brushes for electric motors. Correspondence table for Bosch and Makita power tool motors. What are the criteria for choosing a brush.
How can I control the speed of an induction motor: an overview of the ways
Methods for adjusting the speed of an induction motor without loss of power. How to regulate the speed of rotation of an asynchronous electric motor with squirrel-cage and phase rotor.
How does a capacitor motor work and why is it needed
What is a capacitor motor, what is its principle of operation. How to choose a capacitor to the engine. Connection diagram with reverse and without reverse.
How to reverse a direct and alternating current electric motor
What is engine reverse? Scheme of reverse connection of a DC and AC motor. Changing the direction of rotation of the rotor of an induction motor.
What is a stepper motor, why is it needed and how does it work
Device, principle of operation and scope of stepper motors. What are the types of motor drives and data management schemes for electric machines. Advantages and disadvantages of stepper motors.
What is a servo drive and how does it work
What is a servo drive and where is it used. Advantages and disadvantages of the mechanism. How servos for heating and radio-controlled models work and are arranged.
Reasons and methods for eliminating vibration of electric motors
What is motor vibration and why does it occur. In which GOSTs and other documents the norm is indicated. What are the ways to measure and eliminate vibrations.
What is a photo relay for street lighting and how does it work
Photocells are used to automatically turn on and off the lighting. We will figure out how the photo relay works, what it consists of and what types of light sensors are.
Typical schemes and methods for starting synchronous motors
Typical schemes for starting synchronous motors. Asynchronous start, frequency, by means of an accelerating motor. What devices are used for soft start.
Comparison of the collector and brushless motors
What is the difference between collector and brushless motors. What type of motor is better to choose and why. Comparison of the pros and cons of each option.
How to Prevent Surge Losses in a Home Electric Network - New Development Review
A new development for protection against overvoltage losses in the network is the ONS amplitude limiter. Limiter circuit and operation features. Test know-how.
What is a brushless DC motor, how is it built and running
What is a brushless DC motor, what is its operating principle, types and device. The scope of BDTT, their pros and cons.
What is a DC commutator motor and how does it work
Where a direct current DC motor is used. Design, principle of operation and scope of this type of electric motor. Pros and cons of KDPT.
