jola electrical components Germany jola model jola price

jola electrical components are a new type of contactless switching device composed entirely of solid-state electronic components. It utilizes the switching characteristics of electronic components (such as switching transistors, triacs, and other semiconductor devices) to achieve contactless and spark-free circuit connection and disconnection, hence it is also known as a "contactless switch." A solid-state relay is a four-terminal active device, where two terminals are input control terminals and the other two are output controlled terminals. It has both amplification drive and isolation functions, making it very suitable for driving high-power switching actuators. Compared to electromagnetic relays, it offers higher reliability, is contactless, has a long service life, fast speed, and low external interference, and has been widely used [1].

jola electrical components principle

Its operating principle is the same as that of a transformer, with a basic structure consisting of an iron core and primary and secondary windings. It is characterized by a very small and relatively constant capacity, operating close to no-load conditions during normal operation. The impedance of the voltage transformer itself is very small; once a short circuit occurs on the secondary side, the current will increase sharply and burn out the coils. For this reason, fuses are connected to the primary side of the voltage transformer, and the secondary side is reliably grounded to prevent high potential to ground on the secondary side in case of insulation damage between the primary and secondary sides, which could cause personal injury and equipment accidents. Voltage transformers for measurement are generally made with a single-phase double-coil structure. The primary voltage is the voltage to be measured (such as the line voltage of the power system). They can be used in single phase, or two units can be connected in a V-V configuration for three-phase use. Voltage transformers used in laboratories often have multiple taps on the primary side to accommodate the need to measure different voltages. Voltage transformers for protective grounding also have a third coil, known as a three-coil voltage transformer. The third coils of the three phases are connected in an open-delta configuration. The two output terminals of the open delta are connected to the voltage coil of the grounding protection relay. During normal operation, the three-phase voltages of the power system are symmetrical, and the sum of the three-phase induced electromotive forces on the third coil is zero. Once a single-phase ground fault occurs, the neutral point shifts, and zero-sequence voltage appears between the terminals of the open delta, causing the relay to operate and thus protecting the power system. When zero-sequence voltage appears in the coil, corresponding zero-sequence flux appears in the iron core. Therefore, this type of three-phase voltage transformer uses a side-yoke iron core or three single-phase voltage transformers. For this type of transformer, the accuracy requirement for the third coil is not high, but it requires certain over-excitation characteristics (i.e., when the primary voltage increases, the magnetic flux density in the iron core increases by a corresponding factor without damage). Voltage transformers are indispensable electrical appliances in power plants, substations, and other transmission and distribution systems. Precision voltage transformers are instruments used in electrical testing laboratories to extend measurement ranges and measure voltage, power, and electrical energy. Voltage transformers are very similar to transformers, both being used to transform voltage on lines. Why is voltage transformation needed on lines? This is because, depending on the different conditions of power generation, transmission, and consumption, the voltage on the lines varies greatly, with some being low voltage 220V and 390V, and others being high voltage tens of thousands or even hundreds of thousands of volts. To directly measure these low and high voltages, corresponding low-voltage and high-voltage voltmeters and other instruments and relays would need to be manufactured according to the magnitude of the line voltage. This would not only bring great difficulties to instrument manufacturing, but more importantly, it is impossible and absolutely prohibited to directly manufacture high-voltage instruments and measure voltage directly on high-voltage lines.

jola electrical components classification

Circuit breakers are classified by number of poles: single-pole, two-pole, three-pole, and four-pole; by installation method: plug-in, fixed, and draw-out.

jola electrical components function

When the distance between the observer or system and the wave source changes, the frequency of the approaching waves shifts. This phenomenon is called the Doppler effect. Sonar and radar are developed based on this principle. The Doppler effect can be used to make ultrasonic proximity switches, microwave proximity switches, etc. When an object approaches, the reflected signal received by the proximity switch produces a Doppler frequency shift, thereby identifying whether an object is approaching. Proximity switches are widely used in aviation, aerospace technology, and industrial production. In daily life, they are used in automatic doors in hotels, restaurants, and garages, as well as in automatic hot air blowers. In security and anti-theft applications, such as in important areas like data archives, finance, banking, museums, and vaults, anti-theft devices composed of various proximity switches are usually installed. In measurement technology, such as length and position measurement; in control technology, such as displacement, speed, and acceleration measurement and control, a large number of proximity switches are also used.

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