Frequency converters(VFD) is a power control equipment that applies frequency conversion technology and microelectronics technology to control AC motors by changing the frequency of the motor working power supply. The frequency converter is mainly composed of rectification (AC to DC), filtering, inverter (DC to AC), brake unit, drive unit, detection unit, microprocessor unit, etc. The inverter relies on the internal IGBT to adjust the voltage and frequency of the output power supply, according to the electricity to achieve the purpose of energy saving and speed regulation, in addition, the inverter has many protection functions, such as overcurrent, overvoltage, overload protection and so on. How is the frequency converter wired? This is a big problem that many people will encounter, let's use illustrations to teach you to quickly master the simple inverter wiring method.
10kV capacitor cabinet compensation cabinetCommon methods are manual, automatic, centralized, local and other ways to compensate for the load, improve the quality of the power supply system, and thus improve the efficiency of power distribution equipment. In the work of capacitor compensation cabinet, we often encounter inevitable fault problems, such as excessive current, high temperature, increased consumption and other problems, so how to analyze the cause and solve such problems?
According to the current national standard "Code for the Design of Low-voltage Distribution" (GB50054), the low-voltage distribution system has three grounding forms, namely IT system, TT system, and TN system. So how to avoid TT systems becoming TN systems in building electrical design?Derun ElectricShare with you:
KYN28A high voltage switchgearIt is a kind of high-voltage switchgear that is more common in China, the full name is indoor metal armored removable switchgear.
DC screen is one of the indispensable electrical equipment in the power system, often produced by Derun ElectricHigh voltage switchgearCompanionship. Provide DC power supply for high-voltage switch in normal operation and accident state of split closing, relay protection, automatic control, switch signal indication, accident lighting, etc. The reliability of DC screen is irreplaceable by other power supply devices, which can meet the high reliability requirements of power supply in substations and power plants.
When encountering projects with non-standard power distribution cabinets in production, our new employees always have no clue how to start working, belowDerun ElectricThe workshop director shared some basic knowledge of the cabinet type and other cabinet types;