At 12:45 on August 4, 2022, a dispatching center received a report from a 100 MW photovoltaic power generation base. It was reported that the incoming line switchgear on the 35 kV low - voltage side of the main transformer at the collection station was on fire, and the protection action tripped. After receiving the notification, relevant personnel went to the site and carried out on - site accident investigation together with the operation technicians. Through on - site inspection, it was found

Generally speaking, the designed working magnetic flux density of the iron core in an oil-immersed power transformer can be around 1.75T (the specific value depends on factors such as no-load loss and noise requirements). However, there is a seemingly basic yet easily confusing question: is this 1.75T magnetic flux density value a peak value or an effective value?Even when asking an engineer with many years of experience in transformer design, they may not be able to give an accurate answer imme

Hazards of Multi-point Core Ground FaultsA transformer core must not have multi-point grounding during normal operation. An alternating magnetic field around the winding induces parasitic capacitances between windings, core, and shell. Live windings couple through these capacitances, creating a core floating potential relative to ground. Uneven distances between components cause potential differences; when high enough, they spark. This intermittent discharge degrades transformer oil and solid in

1 Significance of Selecting and Optimally Designing Wind Turbine Transformers in Wind FarmsAs wind power systems spread, more power transformers are integrated, boosting total equipment capacity and operating losses. Transformers, made mainly from costly silicon steel sheets, copper windings, and foils, are also tough to design. Thus, optimal design and scientific selection are needed to meet technical, national - standard, and user requirements.To ensure stable transformer operation, study thei

1. Brief Introduction to the Photovoltaic Power Generation ProcessThe operation process of photovoltaic power generation is as follows: First, individual solar panels are connected in series to form photovoltaic modules, and the modules are arranged in parallel through combiner boxes to form a photovoltaic array. Solar energy is converted into direct current (DC) by the photovoltaic array, and then converted into three-phase alternating current (AC) through a three-phase inverter (DC - AC). Subs

Why is a ZnO surge arrester installed between the power capacitor and its breaker?A ZnO surge arrester is installed to prevent overvoltage caused by switching operations, thereby ensuring the safe operation of electrical equipment.What is the difference between an energy meter and a power meter?A power meter indicates the instantaneous power output or consumption, while an energy meter records the total energy produced, transmitted, or consumed over a specific period.What are the requirements fo

Linear voltage regulators are mainly classified into shunt voltage regulators and series voltage regulators. The key difference between the two lies in their control element configurations: in a shunt voltage regulator, the control element is connected in parallel with the load, whereas in a series voltage regulator, the control element is connected in series with the load. These two regulator circuits operate on distinct principles, thus each having its own advantages and disadvantages, which w

Currently, the market price of copper remains high, fluctuating in the range of 70,000 to 80,000 yuan per ton. In contrast, the price of aluminum stays low, lingering in the range of 18,000 to 20,000 yuan per ton. For power transformers, replacing copper windings with aluminum windings in design will undoubtedly significantly reduce the material cost of products, bringing substantial cost savings to end customers.For a long time, it has been widely believed in the industry that aluminum windings

1.Environmental Requirements for Transformer Core-Lifting Inspection1.1 General Environmental ConditionsCore - lifting operations are preferably carried out indoors. For large transformers that have to be operated outdoors due to specific conditions, sufficient measures must be taken to prevent moisture and dust contamination.Core - lifting should not be conducted during rainy or snowy weather or when the relative humidity exceeds 75%.The ambient air temperature during core - lifting should not

Transformer Operating TemperatureDuring operation, transformers generate copper losses and iron losses, both of which are converted into heat, causing the transformer’s temperature to rise. Most transformers in China use Class A insulation. Due to heat transfer characteristics, significant temperature differences exist between different components during operation: winding temperature is the highest, followed by the core, and then the temperature of the insulating oil (with upper-layer oil being