rehau electrical components Germany rehau model rehau price

rehau electrical components are instruments used to transform voltage. However, the purpose of a transformer transforming voltage is to facilitate the transmission of electrical energy, so its capacity is large, generally calculated in kilovolt-amperes or megavolt-amperes; whereas the purpose of a voltage transformer transforming voltage is mainly to supply power to measuring instruments and relay protection devices, to measure the voltage, power and electrical energy of the line, or to protect valuable equipment, motors and transformers in the line when a fault occurs in the line, so the capacity of the voltage transformer is very small, generally only a few volt-amperes or tens of volt-amperes, with a maximum not exceeding one thousand volt-amperes.

rehau electrical component principle

A resistor consists of three parts: the resistive element, the skeleton, and the leads (for solid-core resistors, the resistive element and the skeleton are combined into one), and only the resistive element determines the resistance value. The volt-ampere characteristic is represented by a graphical curve showing the relationship between voltage and current at the terminals of the resistor; when voltage and current are proportional (the characteristic is a straight line), it is called a linear resistor, otherwise it is called a non-linear resistor. The maximum power dissipation allowed for continuous operation of the resistor at the rated temperature (maximum ambient temperature) tR. For each type of resistor, a maximum working voltage is also specified, meaning that even if the rated power is not reached when the resistance value is high, the maximum working voltage must not be exceeded. The rated power of a resistor refers to the maximum power allowed to be consumed during long-term continuous operation in DC or AC circuits. Load characteristics: When the ambient operating temperature is lower than tR, the resistor must not exceed its rated power; when it exceeds tR, the load power must be reduced. Each type of resistor has specified load characteristics. In addition, the allowable load can be correspondingly reduced under low air pressure. Under pulse load, the average pulse power is far lower than the rated power, and there are generally separate regulations.

rehau electrical component applications

Thermistors can also be used as electronic circuit components for temperature compensation of instrument circuits and cold junction temperature compensation of thermocouples. Utilizing the self-heating characteristic of NTC thermistors enables automatic gain control, forming RC oscillator amplitude stabilization circuits, delay circuits, and protection circuits. When the self-heating temperature is much higher than the ambient temperature, the resistance value is also related to the heat dissipation conditions of the environment, so this characteristic of thermistors is often utilized in anemometers, flow meters, gas analyzers, and thermal conductivity analysis to make specialized detection elements. PTC thermistors are mainly used for overheat protection of electrical equipment, contactless relays, constant temperature control, automatic gain control, motor starting, time delay, automatic degaussing of color TVs, fire alarms, and temperature compensation. Main disadvantages: (1) The relationship between resistance value and temperature is severely non-linear; (2) Poor consistency and interchangeability of components; (3) Components are prone to aging and have poor stability; (4) Except for special high-temperature thermistors, the vast majority of thermistors are only suitable for the range of 0 to 158 °C, which must be noted during use.

rehau electrical component composition

A multimeter consists of three main parts: the meter head, the measurement circuit, and the selector switch. The multimeter is the most basic tool in the field of electronic testing and is also a widely used testing instrument. The multimeter is also called a multi-meter, triple-meter (A, V, Ω, i.e., current, voltage, and resistance triple-use), multiplex meter, or universal meter. Multimeters are divided into analog multimeters and digital multimeters. There is also an oscilloscope multimeter with oscilloscope functions, which is a multi-function, multi-range measuring instrument. General multimeters can measure DC current, DC voltage, AC voltage, resistance, and audio levels; some can also measure AC current, capacitance, inductance, temperature, and certain parameters of semiconductors (diodes, transistors). Digital multimeters have become mainstream and have replaced analog instruments. Compared with analog instruments, digital instruments have high sensitivity, high accuracy, clear display, strong overload capability, are easy to carry, and are more convenient and simple to use.

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