Les Nouvelles De L'Industrie

Performance Parameters and Their Impact on Cost 1. Short-Circuit Impedance The short-circuit impedance affects the voltage regulation and reactive power losses of transformers. A higher short-circuit impedance improves voltage regulation but results in a larger short-circuit current magnitude, influencing the power grid and system. For shell-type transformers, the presence of...

Power transformers can be classified into two types based on their structure: core-type transformers and shell-type transformers. 1. Core-Type Transformers: The winding of a core-type power transformer is cylindrical, and the cross-section of the core column is approximately cylindrical. The high-voltage and low-voltage windings are concentrically arranged, and the body...

The principle of operation for a sliding core transformer is based on the concept of "sliding." The transformer consists of two coils, one of which is connected to the primary side, and the other to the secondary side. The coils are separated by a ferrite core, which is affixed to...

Vacuum epoxy casting technology has been widely used in the production of transformers, as it offers a range of advantages in terms of performance, safety and cost. However, it is also important to consider the environmental benefits of this technology, which are becoming increasingly important in the modern world. This...

How to Approach Transformer Temperature Rise Reasonably? Perspectives on temperature rise encompass various aspects essential for the long-term stable operation of transformers, specifically in the following dimensions: (1) Safety: The prudent control of temperature rise aims to ensure that the internal temperature of the transformer does not exceed safety limits....

What is the thermal class of a transformer? The thermal class of a transformer typically refers to the thermal stability of its insulation system, a crucial factor directly impacting the temperature endurance during prolonged operation. This classification is commonly denoted by letters such as A, E, B, F, H, each...

How is the impulse voltage test conducted for transformers? The impulse voltage test comprises lightning impulse tests (including full-wave and chopped-wave tests) and operating wave impulse tests. In the latest IEC76-3 standard, for transformers with a rated voltage (U) ≤ 40.5kV, both full-wave and chopped-wave impulse tests are considered type...

Maintenance and Fastening of Transformer Body 1. Body Cleaning: Users and manufacturers of transformers have stringent requirements for the cleanliness of the transformer body, making body cleaning crucial. During the assembly process, crucial components, especially insulating parts, require meticulous cleaning. Typically, a vacuum cleaner is used, and clean white cloths...

How is the Induced Voltage Withstand Test for Transformers conducted? The Induced Voltage Withstand Test for fully insulated transformers is conducted by opening the high-voltage winding and applying twice the rated voltage at a frequency of 100-250Hz to the low-voltage winding. Due to the higher frequency, the iron core can...

How to Look at TheParallelOperation of Transformers？ The parallel operation of transformers refers to connecting the primary windings of two or more transformers to a common busbar and connecting their secondary windings to a common secondary busbar. Transformers operated in this manner are termed to be in parallel operation. 1. Advantages of...

How should an overloaded transformer in operation be handled? When an operating transformer experiences overload, it may manifest as the current exceeding the steady-state value, signaling, and alarm bells sounding, among other indicators. Operators should take appropriate steps based on the following principles: (1) Check whether the current on each...

What’s the Operation Steps for Transformer Start-Up？ (1) For transformers using forced oil circulation, the cooling system should be activated before commissioning. In the case of forced oil circulation water-cooled transformers, the oil system must be activated first, followed by the water system. After discontinuing the water cooling system in winter,...