Free Expert Guides on Power Systems, Circuit Design & Electrical Troubleshooting

1. Current Transformer (CT)Working PrincipleThe basic principle of a current transformer (CT) is electromagnetic induction. It converts a large primary current to a smaller secondary current through a closed iron core, making it suitable for measurement and protection. Primary Winding: The primary winding usually has very few turns, sometimes just one turn, and is directly connected in series with the circuit being measured. Core: The core is closed to concentrate the magnetic field. Secondary W

Analysis of the Meaning of 5P20 in Current TransformersExplanation of Accuracy GradeIn current transformers (CTs), 5P20 is an identifier that represents its performance characteristics. This identifier consists of three parts: Accuracy Class, Protection Class, and Accuracy Limit Factor. Accuracy Class (5): The number 5 represents the accuracy class of this current transformer. The accuracy class reflects the measurement error of the current transformer under specific conditions. A smaller number

The impact of using a battery as the input source for a DC-DC converterWhen using a battery as the input source for a DC-DC converter, several factors can affect efficiency and conversion ratio:Battery Voltage and CapacityThe voltage and capacity of the battery directly affect the operating range and efficiency of the DC-DC converter. Different types of batteries (such as lead-acid batteries, lithium batteries, nickel-metal hydride batteries, etc.) have different voltage levels and discharge cha

I. Causes of overvoltage faults in frequency convertersOvervoltage at power inputGrid fluctuationThe grid voltage itself may fluctuate. For example, during the low-load period of the grid, due to the reduction of load, the grid voltage may increase. If the input voltage allowable range of the frequency converter is limited, when the grid voltage exceeds this range, it will cause an overvoltage fault in the frequency converter. Generally, the grid voltage may fluctuate within the range of ±10% -

There are mainly the following reasons why the starting relay does not jump or spark due to a jumper wire:I. Relay design and functionInternal structure designThe starting relay usually has a specific internal structure, including parts such as an electromagnetic coil and contacts. When the electromagnetic coil is energized, it generates a magnetic field that attracts the contacts to close or open, thereby realizing the on-off control of the circuit.For example, the contacts of the relay are usu

Single-phase machines can be connected to a three-phase supply using transformers or specific wiring methods.Use TransformerA single-phase power supply can be boosted to a three-phase voltage using a transformer, and then the motor can be connected to the three-phase power source. It should be noted that the capacity of the transformer should match the capacity of the motor, otherwise the motor may not start or operate stably.Specific Wiring MethodsFor single-phase motors, the capacitor start me

The working principle of the switch-mode regulatorSwitch-mode regulators are efficient voltage regulators that control current by rapidly switching switch elements (such as MOSFETs) and achieve voltage regulation through energy storage components (like inductors or capacitors). Here's an explanation of how they work and their key components:1. Switch Element ControlThe core of a switching regulator is a switch element that periodically switches between the ON state and the OFF state. When the sw

The control effect of voltage regulator on output voltageProviding a stable power supplyIn various electronic devices and electrical systems, a stable power supply voltage is the key to ensuring the normal operation of the device. The voltage regulator directly controls the output voltage to ensure that the output voltage is not affected by factors such as input voltage fluctuations and load changes, providing a reliable power supply for the device.For example, in electronic devices such as comp

The working principle of current transformers (CT) during a short circuit.Working PrincipleIn normal working conditions, the secondary circuit of a current transformer (CT) is closed and has very low impedance, causing the CT to operate in a near-short-circuit state. When a short circuit occurs, the behavior and characteristics of the current transformer change significantly.Performance during a short circuit Voltage Increase: In a short-circuit scenario, due to the extremely low impedance of th

Hybrid solar inverters (Hybrid Solar Inverter) and non-hybrid solar inverters (Standard Solar Inverter) have distinct differences in design and functionality, each with unique advantages and disadvantages. Understanding these can help you make an informed decision when choosing a solar system that suits your needs.Hybrid Solar Inverter (Hybrid Solar Inverter)Advantages Integrated Storage: Hybrid inverters can directly integrate with battery storage systems, allowing users to store excess solar e