How relays work
Relays generally refer to electromagnetic relays, that is, mechanical actions. The working principle of the relay is essentially to use one loop (generally a small current) to control the on/off of another circuit (generally a large current), and in this control process, the two circuits are generally isolated.
The basic principle of the relay is to use the electromagnetic effect to control the mechanical contact to achieve the purpose of on-off, and to energize the coil with the iron core - the coil current generates a magnetic field-magnetic field adsorption armature action on-off contact, the whole process is a process of "small current-magnetic-mechanical-large current".
What is the use of relays
The relay is an automatic switching element with isolation function, and when the change of the excitation amount in the input loop reaches a specified value, the controlled power in the output circuit can undergo a predetermined step change.
The relay has an induction mechanism that can reflect a certain excitation quantity (electric or non-electric) from the outside world, an actuator that realizes "on" and "off" control of the controlled circuit, and an intermediate comparison mechanism that can compare, judge and convert the size of the excitation quantity.
Relays are widely used in remote control, telemetry, communication, automatic control, mechatronics and aerospace technology, etc., playing the role of control, protection, regulation and transmission of information.
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Siemens APT Relays - Installation Precautions for High and Low Voltage Relays
1. Choose the right relay: When choosing a high and low voltage relay, you should choose the right product according to your needs, such as selecting according to the rated voltage, current and other information
2. Installation location: high and low voltage relays should be installed in dry, ventilated, non-corrosive gas, less dusty areas, ...
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Siemens APT Relays – Common Causes of Failure of Solid State Relays
1. The reason for the frequent disconnection of the coil: whether the solid state relay is cleaned with ultrasonic, whether the coil is overvoltaged, etc., will cause the coil to be disconnected.
2. The reason for the insufficient power supply of the coil: First, it is necessary to confirm the voltage of the solid state relay coil. If the voltage supplied to the coil is lower than ...
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Siemens APT relay - the main structural features of high and low voltage relays
1. Electromagnet: The electromagnet of high and low voltage relay is usually composed of two parts: coil and core. When the high and low voltage relay inputs the electrical signal, the electromagnet coil will generate electromagnetic force, drive the iron core, and realize the on/off control of the relay.
2. Contact group: The contact group is a high and low voltage relay control ...
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Introduction to the advantages and disadvantages of Siemens APT relays - solid state relays
merit
1. High life, high reliability: solid state relay has no mechanical parts, the contact function is completed by solid devices, because there are no moving parts, so it can work in a high impact and vibration environment.
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Siemens APT Relays - Precautions for the use of solid state relays
1. When choosing the solid state used in the printed circuit board with small current specifications, because the lead terminal is made of high thermal conductivity material, the welding should be carried out under the condition that the temperature is less than 250 °C and the time is less than 10S.
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Siemens APT Relays – The difference between AC relays and DC relays
1. Structural characteristics of AC relays
The coil of the AC relay is shorter, and the wire diameter is thicker, mainly because the coil is passed through the alternating current, the reactance is larger, and the thick wire diameter can reduce the internal resistance and reduce the heat generation.
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Siemens APT Relays – The difference between solid state relays and intermediate relays
First, the solid-state relay has no contacts and coils in the structure, which can be opened and closed at a high frequency and will not produce sparks, and has a long service life;
Second, the intermediate relay is generally only used for the control loop, and cannot work with load, and will make a "pop" sound when it is sucked in;
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Siemens APT Relays – Functions of High Voltage Relays
1. Control switch: The high-voltage relay can open or close the high-voltage circuit to achieve the purpose of controlling the work of the equipment.
2. Protection circuit: The high-voltage relay can monitor the current, voltage, temperature and other parameters inside the high-voltage circuit, and automatically cut off the circuit when the circuit is abnormal.
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Siemens APT Relays – How to Choose the Right Power Relay
1. Measure the resistance of the contact
Use the resistance level of the universal meter to measure the resistance of the normally closed contact and the moving point, and its resistance value should be 0, (the contact resistance value can be measured in a more accurate way within 100 milliohms); The resistance between the normally open contact and the moving point is infinite. From this, it can be distinguished which is a normally closed contact ...
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Siemens APT current transformer – current transformer operating error
When the current transformer is finalized and its internal parameters are determined, the magnitude of the error will be affected by the secondary current (or primary current), secondary load, power factor, and frequency. These factors are called external factors, and the error of the current transformer in operation is mainly affected by these four factors.
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Introduction to the characteristics of Siemens APT relays - solid state relays
Solid state relay is a non-contact electronic switch with isolation function, no mechanical contact parts in the switching process, so in addition to having the same function as electromagnetic relay, solid state relay also has logic circuit compatibility, vibration resistance and mechanical impact resistance, unlimited installation position, and good anti-...
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Siemens APT current transformer - working principle and characteristics of current transformer
How a current transformer works
The principle of current transformer is based on the principle of electromagnetic induction. A current transformer is composed of a closed core and windings. It has a small number of turns on the primary side winding, stringed in the line where the current needs to be measured, so it often has the full current of the line ...
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Siemens APT relay - the cause and solution of the fault of the high-voltage relay
1. Some common faults of high-voltage relay coils
1. The common fault cause of the coil is often disconnected: whether the ultrasonic wave is used to clean the high-voltage relay, or whether the overvoltage is added to the coil will also promote the probability of the coil being disconnected.
2 ...
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Siemens APT Relays - Maintenance Methods for Solid State Relays
1. The influence of the ambient temperature
The load capacity of the solid state relay is greatly affected by the ambient temperature and its own temperature rise, during the use of the device, it should be ensured that it has good heat dissipation conditions, the rated working current of more than 10A products should be equipped with radiators, and the products above 100A should be dissipated.
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Siemens APT current transformer - common faults and solutions of current transformers
1. There is an abnormal noise or over-temperature of the iron core
Cause of failure: When the current transformer is in operation, if there is an open circuit or overload in the secondary circuit, it will lead to abnormal sound and over-temperature of the core.
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Siemens APT current transformer – a common form of current transformer ratio
1. Multi-tap current transformer. The primary winding remains unchanged, and when winding the secondary winding, several taps are added to obtain a plurality of different transformation ratios. For example, two taps are added to the secondary winding, K1 and K4 are 800/1A, K1 and K3 are 600/1A, and K1 and K2 are 400/1A, that is, the transformation ratio is 400-600-800/1A...
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Siemens APT current transformer - how to choose a current transformer?
First, the principle of primary parameter selection of current transformer
The rated primary current of the current transformer is determined by the actual load of the tested circuit, and the rated primary current of the current transformer should not be less than the rated primary current of the circuit.
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Siemens APT transformer – common faults and analysis of voltage transformers
(1) The insulation between the iron chips is damaged
Problem: The temperature rises during operation.
Possible causes of the problem:
(1) Poor insulation between iron chips
(2) The use of harsh environmental conditions or long-term operation at high temperature to promote the aging of insulation between iron chips.
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Introduction to the characteristics of Siemens APT ZY2 miniature relay
1. Various specifications, with indicator light, with manual test button, with surge suppression loop and other functions
2. Coil control voltage DC6V-220V, AC6V-240V (50/60HZ)
3. The rail type is equipped with a variety of adaptation sockets
4. LED indicator, DC is green, AC is red
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Siemens APT relay - the main structural features of high and low voltage relays
1. Electromagnet: The electromagnet of high and low voltage relay is usually composed of two parts: coil and core. When the high and low voltage relay inputs the electrical signal, the electromagnet coil will generate electromagnetic force, drive the iron core, and realize the on/off control of the relay.
2. Contact group: The contact group is a high and low voltage relay control ...
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