SKELDO electrical components German SKELDO models SKELDO prices

SKELDO electrical components are current fuses that provide overload protection. When a circuit fault or abnormality occurs, the current continues to rise. This rising current may damage certain important devices in the circuit, burn out the circuit, or even cause a fire. If a fuse is correctly installed in the circuit, it will melt and cut off the current when the current abnormally rises to a certain level and temperature, thereby protecting the safe operation of the circuit. With a fuse correctly installed in the circuit, the fuse will melt and cut off the current when the current abnormally rises to a certain level and temperature, protecting the safe operation of the circuit. The fuse invented by Edison was used to protect expensive incandescent lamps at the time. With the development of the times, fuses protect power equipment from damage due to overcurrent and overheating, avoiding serious damage to electronic equipment caused by internal faults.

SKELDO electrical component parameters

Important aspects of the optical parameters of LED include: luminous flux, luminous efficacy, luminous intensity, light intensity distribution, and wavelength. 1. Luminous efficacy is the ratio of luminous flux to electrical power, with the unit generally being lm/W. Luminous efficacy represents the energy-saving characteristics of a light source, which is an important indicator for measuring the performance of modern light sources. 2.LED Luminous intensity characterizes the strength of light emission in a specific direction. Since the light intensity of LED varies significantly at different spatial angles, we have studied the light intensity distribution characteristics of LED. This parameter has great practical significance and directly affects the minimum viewing angle of LED display devices. For example, for large color LED screens in stadiums, if the selected LED single-tube distribution range is very narrow, viewers at larger angles facing the screen will see distorted images. Moreover, traffic sign lights also require recognition by people over a wide range. 6. Regarding the spectral characteristics of LED, we mainly examine whether its monochromaticity is excellent, and pay attention to whether the main colors such as red, yellow, blue, green, and white LED are pure. Because in many occasions, such as traffic signal lights, the requirements for color are quite strict. However, observations show that some LED signal lights in China emit blue-green light, and the red ones are deep red. From this phenomenon, it is very necessary and meaningful to conduct specialized research on the spectral characteristics of LED.

SKELDO electrical component principle

Its working principle is the same as that of a transformer, and its basic structure consists of an iron core and primary and secondary windings. The characteristic is that the capacity is very small and relatively constant, and it operates close to no-load status 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 coil. Therefore, a fuse is 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 from causing personal injury and equipment accidents when the insulation between the primary and secondary sides is damaged. Voltage transformers for measurement are generally made into a single-phase double-coil structure. The primary voltage is the voltage to be measured (such as the line voltage of the power system). It can be used as a single phase, or two units can be connected in V-V configuration for three-phase use. Voltage transformers used in laboratories often have multiple taps on the primary side to adapt to 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 terminals of the open delta are connected to the voltage coil of the ground 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, thereby protecting the power system. If zero-sequence voltage appears in the coil, zero-sequence magnetic flux will appear in the corresponding 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 transmission and supply systems such as power plants and substations. Precision voltage transformers are instruments used in electrical testing laboratories to expand measurement ranges and measure voltage, power, and electrical energy. Voltage transformers are very similar to transformers; both are 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 lines varies greatly, with significant differences. Some are low voltage 220V and 382V, while others are high voltage tens of thousands of volts 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.

SKELDO electrical component function

The main purposes of disconnectors (knife switches) are: 1, used to isolate the power supply, disconnecting high-voltage maintenance equipment from live equipment, creating a clearly visible break point between them. 2, disconnectors cooperate with circuit breakers to perform switching operations according to the needs of the system operating mode, changing the system wiring configuration. 3, used to connect or disconnect low-current circuits. Disconnectors can perform the following operations: pulling and closing bypass currents of loop switches; pulling and closing the grounding wire of the transformer neutral point, but when an arc-suppression coil is connected to the neutral point, operation is only permitted when the system is fault-free; pulling and closing voltage transformers and lightning arresters; pulling and closing the capacitive current of busbars and equipment directly connected to the busbars; pulling and closing no-load lines with capacitive current not exceeding 5 amperes; triple disconnectors can pull and close loads with voltage at 10 kilovolts and below and current below 23 amperes. When operating disconnectors, note that when energizing a line, first close the busbar-side disconnector, then close the line-side disconnector, and finally close the circuit breaker. When de-energizing a line, first open the circuit breaker, then open the disconnector. Do not pull or close high-voltage disconnectors under load.

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