Siemens APT Relays - a detailed introduction to the classification of relays

The principle of the current transformer is based on the principle of electromagnetic induction. A current transformer is composed of a closed core and windings. Its primary side winding turns are very small, string in the line of the current that needs to be measured, so it often has all the current of the line flowing through, the number of turns of the secondary side winding is relatively large, and the series ...

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.

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.

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.

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.

1. Working process: AC zero-crossing solid state relays have the characteristic of turning on when the voltage crosses zero and turns off when the load current crosses zero. Circuit diagrams, dimensions and drawings of zero-crossing AC solid state relays When the optocoupler OPT is turned off (i.e. there is no input signal at the control end of the OPT ...

1. Standardize current transformer: the top of the transformer verification is used as a standardizer, and the accuracy is usually more than two grades higher than that of the tested. 2. Load box: imitate the practice operation status of the tested transformer. 3. Transformer ...

1. When selecting the solid-state relay used in the printed circuit board with small current specifications, because the lead terminal is made of high thermal conductivity material, the soldering should be carried out under the condition that the temperature is less than 250 °C and the time is less than 10S.

1. The simplest and most effective way is to use a new solid state relay. 2. The other is to determine the voltage of the coil to avoid the voltage provided by the coil being less than the operating voltage. 3. Check whether the polarity is reversed. 4. Reasonable power-on time for the solid state relay coil, if ...

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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Various specifications, with indicator light, with manual test button, with surge suppression loop and other functions Coil control voltage DC6V-220V, AC6V-240V(50/60HZ) The rail type is equipped with a variety of adapting sockets LED indicator, DC is green, AC is red Illuminating...

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 ...

1. The resistive load should not exceed 60% of the rated current; 2. Overcurrent and load short circuit may cause permanent failure of the internal thyristor in SSR, so it is necessary to install a fuse or air switch, and a fuse can be used if the capacity is small; 3、 ...

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; ...

1. The position of the auxiliary contact is not suitable. After the switch has been tripped, the mechanical part has moved, worn phenomenon, resulting in the auxiliary contact position offset to the correct position, in the protection action tripping, when the auxiliary contact is not disconnected, the outlet electrical appliances, electrical appliances, relays have returned, and it is ...

(1) The influence of the internal resistance R2 and leakage impedance X2 of the secondary coil on the error: when R2 increases, the specific difference and angular difference increase; As X2 increases, the specific difference increases, but the angular difference decreases. Therefore, to improve the error, R2 and the appropriate X2 value should be minimized. Due to the secondary coil internal resistance R2 and leakage ...

1. The inspection basis for whether the current transformer is damaged: 1. The basis for checking whether the polarity is damaged: The primary winding of the current transformer is marked P1 and P2, and the secondary winding is marked as S1 and S2. If P1 and S1 are the same name, then this sign is called reduced polarity. Primary current from P1 ...

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, ...

First, the contact is loose and cracks The contact is the electrical contact part of the relay to complete the switching load, and the contact of some products is riveted and pressed, and its main drawbacks are loose contacts, cracked contacts or excessive dimensional position deviation. This will affect the contact reliability of the relay. Shovel appears ...