What are the characteristics of layer-type windings?

What are the characteristics of layer-type windings? Among the types of transformer windings, layer-type windings hold a unique position. And layer-type windings are applicable to transformer windings with lower voltages and smaller capacities, such as the low-voltage windings of small distribution transformers and the windings of some control transformers. Understanding their characteristics is of great significance for the rational selection of transformer winding forms. The following will elaborate on the characteristics of layer-type windings in detail. Content 1. Structural characteristics Layer-type windings are formed by winding wires layer by layer onto the iron core column. The wires in each layer are closely arranged, and adjacent layers are separated by insulating

What are the characteristics of disc–type winding? Among the many types of transformerwinding, disc-typewinding have remarkable characteristics and are widely used. Disc-typewinding are mainly used in high-voltage transformers with higher voltages and larger capacities. For example, in large power transformers, their good mechanical and heat dissipation properties can adapt to the high electric field intensity, large current, and complex heat exchange requirements brought by high voltages and large capacities. A thorough understanding of the characteristics of disc-typewinding helps us better understand their applicability in different scenarios. The following will elaborate on them in detail. Content 1. Structural characteristics Disc-typewinding consist of multiple disc-shaped coils. Each disc-shaped coil is formed by winding the wire in a

What are the measures to avoid insulation aging of transformers? Transformers play a key role in the power system, and insulation aging can seriously affect their performance and lifespan. To ensure the safe and stable operation of transformers, it is crucial to take effective measures to avoid insulation aging. Content 1.  Optimize the operating environment (1) Temperature control: Install an effective cooling system, such as the oil – circulation cooling for oil – immersed transformers and the forced – air cooling device for air – cooled transformers. Ensure that the transformer operates within an appropriate temperature range. Generally, the upper – layer oil temperature of the transformer should not exceed the

What are the functions of transformer winding? In transformers, winding play a crucial role. They are like the “heart” of a transformer and are directly related to the performance and function of the transformer. This article will discuss in detail the important functions played by winding in transformers. Content 1. Constituting the internal circuit The transformer winding constitute the internal circuit of the equipment. It is the main channel for current transmission. It introduces the electric energy from the external power grid into the transformer, is directly connected to the external power grid, and outputs the transformed electric energy of the transformer. By changing the number of turns of the

What is on-load voltage regulation of transformers? (Part 2) The principle of on-load voltage regulation is to set multiple taps on the high-voltage winding or low-voltage winding of the transformer. By switching the tap changer, different taps are connected to the circuit to change the number of turns of the winding and then adjust the output voltage. Next, we will introduce in detail the disadvantages of on-load voltage regulation. Content 1.High cost The structure of on-load voltage regulation transformers is relatively complex and requires special tap changers and voltage regulation control systems, which makes their manufacturing and maintenance costs relatively high. In addition, the operation of on-load voltage regulation transformers also

What is the function of a reactor? Reactor commonly used in power systems include series reactors and shunt reactors. Series reactors are primarily used to limit short-circuit currents, and they can also be connected in series or parallel with capacitors in filters to limit high-order harmonics in the grid. Reactors in 220kV, 110kV, 35kV, and 10kV grids are used to absorb reactive power caused by the capacitance of cable lines. The operating voltage can be adjusted by changing the number of shunt reactors. Shunt reactors in ultra-high-voltage systems have various functions related to improving the operation of the power system’s reactive power, including: Mitigating the capacitive effect on lightly loaded

How to Suppress Reactor Resonance Overvoltage?  – Collaborative Design of Damping Resistors and Filters In power system operation, the LC resonance circuit formed by reactors and distributed capacitance can generate dangerous overvoltage phenomena. According to measured data from IEEE Std. C57.21-2021, the peak resonance overvoltage can reach 2-3 times the rated voltage, posing a serious threat to equipment safety. This article delves into the collaborative working principles of damping resistors and active filters, revealing their physical mechanisms and engineering implementation methods for suppressing resonance overvoltage. Content 1. Generation Mechanism and Hazards of Resonance Overvoltage 1.1 Physical Process of Resonance Formation Reactor resonance overvoltage originates from the periodic exchange of electromagnetic

How is the lightning arrester protection of the transformer carried out? The lightning arrester is the most crucial basic component for protecting power generation equipment and transmission and transformation equipment. It also forms the foundation for determining the insulation level of high-voltage electrical equipment. Installed in front of the transformer, the arrester mainly consists of a spark gap and a non-linear resistor (valve plate). When the overvoltage generated by lightning attacks the transformer, it first passes through the arrester. At this point, the spark gap of the arrester discharges, thereby limiting the overvoltage on the insulation of the transformer. During the discharge process, the non-linear resistor with good volt-ampere characteristics

What are the precautions for live oil filtration? (1) Throughout the entire process of live oil filtration and degassing, the gas relay circuit of the transformer must be connected to the signal circuit to prevent gas leakage and oil running in the pipeline, causing the oil switch to trip and resulting in a large-scale power outage. (2) The pipelines and joints connecting the oil filter machine and the transformer must be securely tied, with no occurrence of rupture, damage, or gas leakage. (3) For forced oil-cooled and water-cooled transformers, the connected cooler oil pump should not be started, as the excessive oil pump flow can cause the heater of the

How are the deviation values of transformer parameters and the parameters using peak values specified? The specifications for evaluating the performance parameters of transformers are determined by technical conditions, and each standard value has corresponding deviation values, which can be categorized into several types: (1) Parameters with only a lower limit specified, without an upper limit, where larger values are better: a.Absorption ratio, insulation resistance; b. Distance between bushings with voltage; c. Insulation withstand capability; d. Local discharge test time and frequency, AC withstand voltage test time and frequency; e. Electrode surface; f. Number of impulse short-circuit tests; g. Number of impact tests; h. Electrical and mechanical lifespan of on-load