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

Purpose of neutral groundingProvide reference potentialIn a power system, neutral grounding provides a stable reference potential for the entire circuit, which is usually defined as zero potential. This helps determine the voltage value of other lines (such as the fireline) with respect to this zero potential, making voltage measurement and analysis more convenient and accurate. For example, in a three-phase four-wire low-voltage distribution system (380V/220V), the voltage between the live line

Overload Relay trips in refrigerator compressors are usually done to protect the compressor from damage. The function of the overload relay is to cut off the power supply when the current is too large to prevent overheating or damage to the compressor. Here are some common causes of overload relay trip:Overload Difficulty in starting: If the compressor experiences difficulty in starting, it may cause excessive instantaneous current, which can trigger the overload relay. Continuous high load: If

Arc Fault Circuit Interrupter (AFCI) and Ground Fault Circuit Interrupter (GFCI) are two different types of circuit breakers that have different functions and uses and cannot be used interchangeably. Here are the differences between them:AFCI (Arc Fault Circuit Breaker) Design purpose:AFCI is primarily used to detect and prevent arc failure, which is an electrical failure due to loose wires or connections that can cause a fire. An arc failure usually occurs when the insulation of a wire is damag

There is indeed a correlation between the size of the circuit breaker (which usually refers to its rated current, which is the number of amps) and its strength (which is its ability to protect). The size selection of the circuit breaker should be based on the specifications of the wires in the circuit and the expected maximum load current. Here's a detailed explanation:The relationship between circuit breaker size and strengthProtection abilityThe size (rated current) of the circuit breaker dete

High Voltage Current Transformer (HVCT) is a key device used to measure and monitor current changes in high voltage power systems. Its main role is to provide a safe and reliable way to detect and measure current without direct contact with high-voltage circuits. The following are the main roles of high voltage current transformers:Current measurementThe core function of the high voltage current transformer is to measure the current in the high voltage circuit. Because the current in high-voltag

Parallel circuit breakers usually refer to circuit breakers used for parallel operation in power systems. Their purpose is to achieve the simultaneous operation of multiple circuit breakers to achieve load distribution, increase system capacity, and enhance redundancy and flexibility. The following are the main purposes and application scenarios of parallel circuit breakers:Load distributionIn large power systems, a single circuit breaker may not be sufficient to handle the full load. By connect

Definition and characteristics of active maintenanceProactive maintenance is an equipment management strategy that aims to avoid equipment failure through prevention and early intervention, thereby extending the service life of equipment and improving overall performance. Unlike passive maintenance (such as repair after failure), active maintenance focuses on predictive management and maintenance of equipment to reduce downtime and repair costs.The core concept of proactive maintenance Preventiv

Protection measures for use of three-phase transformersThree-phase transformer may encounter various faults and abnormal working conditions during use, in order to ensure its safe and stable operation, a series of protective measures are usually taken. The following are several common protection measures for three-phase transformers according to the search results:Gas protectionGas protection is a protective measure used to reflect the internal failure of the transformer tank and the reduction o

Distribution of ground fault current in the Zigzag winding of Earthing Transformer

Restricted earth fault protection Circuit diagram of transformer