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 shock and vibration environment, due to the inherent characteristics of the components that make up the solid state relay, it determines the long life of the solid state relay and high reliability.
2. High sensitivity, small control power, good electromagnetic compatibility: the input voltage range of the solid state relay is wide, the driving power is low, and it can be compatible with most logic integrated circuits without adding buffers or drivers.
shortcoming
1. The voltage drop of the tube after turn-on is large, the forward voltage drop of thyristor or bidirectional silicon control can reach 1-2V, the saturation voltage drop of high-power transistors is also between 1-2V, and the on-resistance of the general power MOSFET is also larger than the contact resistance of the mechanical contact.
2. Semiconductor devices can still have leakage currents from a few microamperes to several milliamperes after being turned off, so ideal galvanic isolation cannot be achieved.
3. Due to the large voltage drop of the tube, the power consumption and heat generation after turn-on are also large, the volume of high-power solid-state relay is much larger than that of electromagnetic relay of the same capacity, and the cost is also higher.
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Siemens APT Relays – The Difference Between Solid State Relays and AC Contactors
1. First of all, solid-state relays have a long service life and strong reliability. The solid state relay corresponds to the CDG1 series delicacy. This solid-state relay has no mechanical parts and solid-state devices to complete the contact function. Since the parts do not move, they can work in high shock and vibration environments. Because...
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Siemens APT Current Transformer - The difference between voltage transformer and current transformer
The difference between the voltage transformer and the current transformer in terms of effect principle The primary difference is that the operating conditions are very different during normal operation, and the main performance is as follows:
1) The current transformer can be short-circuited twice, but it cannot be opened; The voltage transformer can be opened twice, but it must not be short-circuited
2) ...
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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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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 – What are the types of protection relays?
Overcurrent Relay (OCR)
It operates when a certain value or greater of current flows through. There are two elements: overcurrent detection (known as a timing element) and short-circuit current detection (as an instantaneous element).
Earth Fault Overcurrent Relays (OCGR, GR)
While...
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Siemens APT current transformer - introduction to the classification of current transformers
Categorized by use
According to different uses, current transformers can be roughly divided into two categories:
Current transformer for measurement (or measurement winding of current transformer): provides current information of the power grid to measurement, metering and other devices within the normal working current range.
Protecting Electricity ...
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Siemens APT Pushbutton Switches - Introduction to the types of metal pushbutton switches
Common types of metal button switches include self-locking switches, self-reset switches, knob gear switches, lever gear switches, locking switches, etc.; Because the metal button switch is small in size, easy to install, metal material, voltage can be used from 9-220V, and the appearance of metal texture ...
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Siemens APT - LW39 series 10,000 revolutions FAQ
1. What are the current specifications of universal transfer switches?
At present, there are four forms: 10A, 16A, 25A, and 63A
2. What are the positioning angles of the universal transfer switch?
At present, it is divided into four angles: 30°, 45°, 60° and 90°
3. There is no customer's ...
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Siemens APT Relays - Classification and Introduction of Relays
According to the principle of action, it is divided into:
1. The rectifier relay is used in the AC circuit, and its electromagnetic system, contact system and action principle are the same as those of the DC stepless relay.
2. Transistor relay: Transistor relay is composed of transistor transmitter or zero indicator, logic relay, transistor relay.
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Siemens APT Relays – Classified by relay load
(1) Micro-power relay: when the contact open circuit voltage is DC 28V, the (resistivity) is 0.1A, 0.2A relay.
(2) Weak power relay: when the contact open circuit voltage is DC 28V, (resistivity) is 0.5A, 1A relay.
(3) Medium power relay ...
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Siemens APT Relays – How to Choose Relays?
1. The type and series of relay selection
First of all, the type of relay is selected according to the work requirements of the object to be controlled or protected, and then the appropriate series is selected according to the sensitivity or accuracy requirements. When choosing a series, you should also pay attention to the compatibility of the relay with the system.
(1) ...
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Siemens apt - TL series police lights frequently asked questions
1. How many light sources are there for the TL-70 police light?
There are 3 types, namely LED, incandescent and xenon.
2. What are the colors of the TL-70 police light?
There are 5 types, which are red, yellow, green, blue, and white.
3. What are the types of TL-70 police lights?
3 ...
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Siemens APT warning light - the role of LED warning light in life
LED warning light function
1. The luminous method selection items are: solid light, shiny, burst flash, constant/shiny mix.
2. The installation base is: L rod, straight rod, folding, and barrel type.
Effect of LED warning light_Effect in different scenes
1. Construction unit
On the road ...
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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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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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Siemens APT current transformer – precautions for current transformers
1. Before the installation of the open current transformer, it must be connected to the meter (or other measuring devices) for the second time to ensure that the transformer is not open for the second time;
2. Place all the open current transformers connected to the secondary line on the site and wait for installation;
3. If the on-site bus is electrical...
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Siemens APT Relays - the main product technical parameters of relays
(1) Rated working voltage: refers to the voltage required by the coil when the relay is working normally. Depending on the type of relay, it can be either AC voltage or DC voltage.
(2) DC resistance: refers to the DC resistance of the coil in the relay, which can be measured by a multimeter.
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Siemens APT Relays – Protection Measures for AC Solid State Relays
1. Selection of voltage level and overvoltage protection of solid-state relay
When the voltage peak value applied to the AC terminal of the solid state relay exceeds the maximum voltage peak that the AC solid state relay can bear, the components in the solid state relay will be broken down by the voltage and cause damage to the AC solid state relay, ...
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What are the main problems with Siemens APT Relays – Solid State Relays?
When the solid state relay is open and there is voltage at the load end, there will be a certain leakage current at the output end, and care should be taken to prevent electric shock when using or designing. When the solid-state relay fails to be replaced, the original model or the product with the same technical parameters should be selected as far as possible, so as to match the original application line and ensure that the system ...
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Siemens APT current transformer – wiring method of current transformer
1. The single wiring mode can only feedback the status of single-phase current.
2. Three-phase complete star wiring, usually used in transformer differential protection wiring.
3. The two-phase incomplete star wiring method is used frequently in daily work.
4. The two phases ...
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