Industry -

Menu

Industry

Single-phase multi-function meter power circuit

Nowadays, most power supply departments have required the newly installed single-phase watt-hour meter to withstand high voltage (such as 380V voltage) in order to prevent damage to the watt-hour meter due to incorrect connection of the power grid or artificially use the over-voltage power supply method to destroy the watt-hour meter. ) For a certain period of time (such as 4h) without damage, if the input circuit of the single-phase meter is not processed, the input high voltage will cause the watt-hour meter to burn out in a short time. As long as a suitable PTC thermistor is connected in series with the input end of the transformer for overcurrent protection, and the external voltage is mainly applied to the PTC thermistor, the linear transformer can be prevented from being heated and damaged. In order to ensure that no malfunction occurs, the non-operating current of the thermistor should be selected with reference to the actual AC input current of the meter, and leave a 50% margin...

2018 - 03 - 27
Temperature sensor's time constant and hysteresis, temperature sensor temperature measurement factor

Temperature sensor temperatureThe transducer converts the temperature into an available output signal by utilizing the laws of various physical properties of the substance as a function of temperature. The temperature sensor is the core part of the temperature measuring instrument and has a wide variety. According to the measurement method, it can be divided into two types: contact type and non-contact type. According to the characteristics of sensor materials and electronic components, it can be divided into two types: thermal resistance and thermocouple. The modern temperature sensor is very small in shape, which makes it widely used in various fields of production practice, and also provides countless conveniences and functions for our lives.Temperature sensor time constant and hysteresis improvement measuresThe temperature sensor time constant and hysteresis are related to the heat capacity and thermal resistance of the temperature sensor. In addition to the temperature sensor with...

2018 - 03 - 27
Motor start PTC thermistor application principle

Application principleWhen the motor starts, it must overcome its own inertia, and at the same time overcome the reaction force of the load (such as the refrigerant reaction must overcome the reaction force of the refrigerant when the refrigerator compressor starts), so the motor needs a large current and torque when starting. When the rotation is normal, in order to save energy, the required torque has to be greatly reduced. Add a set of auxiliary coils to the motor, only work at startup, and it will open after normal. Connect the PTC thermistor in series to start the auxiliary coil. After starting, the PTC thermistor enters the high-impedance cut-off auxiliary coil, which can achieve this effect.Electronic ballast, energy-saving lamp preheating soft start PTC thermistorexternal structureApplication principleThe PTC thermistor is used on the electronic ballast of the energy-saving lamp, and the hard start of the electronic ballast and the electronic energy-saving lamp can be changed to...

2018 - 03 - 27

Copyright © 2018 安培龙 All Rights Reserved Rhino cloud provides cloud computing services