Explain the rated impedance voltage of the transformer
- Categories:Industry Dynamics
- Author:
- Origin:
- Time of issue:2022-01-14
- Views:0
(Summary description)For electrical equipment such as transformers, ensuring excellent quality can win customers, occupy the market, and make electricity safer. In order to achieve this goal, we must do a good job in every production link. The high quality of the product quality of the control transformer purchased from raw materials and the test voltage (line voltage) measured during the transformer load loss test is the impedance voltage Uz of the transformer, also known as short-circuit impedance or short-circuit voltage, expressed as a percentage of the rated voltage. Uz%, the impedance voltage should also be converted to the corresponding value at 75°C. The allowable deviation of the impedance voltage is related to the size of the impedance voltage. The impedance voltage value of the main tap is greater than or equal to
Explain the rated impedance voltage of the transformer
(Summary description)For electrical equipment such as transformers, ensuring excellent quality can win customers, occupy the market, and make electricity safer. In order to achieve this goal, we must do a good job in every production link. The high quality of the product quality of the control transformer purchased from raw materials and the test voltage (line voltage) measured during the transformer load loss test is the impedance voltage Uz of the transformer, also known as short-circuit impedance or short-circuit voltage, expressed as a percentage of the rated voltage. Uz%, the impedance voltage should also be converted to the corresponding value at 75°C. The allowable deviation of the impedance voltage is related to the size of the impedance voltage. The impedance voltage value of the main tap is greater than or equal to
- Categories:Industry Dynamics
- Author:
- Origin:
- Time of issue:2022-01-14
- Views:0
For electrical equipment such as transformers, ensuring excellent quality can win customers, occupy the market, and make electricity safer. In order to achieve this goal, we must do a good job in every production link.
Control of raw material procurement
The high quality of the transformer product quality and the transformer load loss test, the measured test voltage (line voltage) is the impedance voltage Uz of the transformer, also known as short-circuit impedance or short-circuit voltage, expressed as a percentage of rated voltage Uz%, impedance The voltage should also be converted to the corresponding value at 75°C.
The allowable deviation of the impedance voltage is related to the size of the impedance voltage. When the impedance voltage value of the main tap is greater than or equal to 10%, the allowable deviation is ±10%.
The impedance voltage is small and the short-circuit current is large. The impedance voltage is too small and the short-circuit current is too large. When a short-circuit occurs at the output end, the transformer is easily damaged by excessive electric force. Therefore, the national standard GB1094.5-2008 stipulates that the minimum value of impedance voltage is shown in the following table
What is the short-circuit impedance of the transformer (the impedance voltage of the transformer)?
The short-circuit impedance of the transformer, also known as the impedance voltage of the transformer, represents the voltage loss (percentage value) generated by the transformer's own impedance when the transformer passes the rated current; side short circuit, the voltage applied when the rated current flows on the primary side, and then converted into a percentage of the rated voltage; the impedance voltage of the transformer is an important parameter of the transformer, which is of great significance to the parallel operation and economic operation of the transformer. It is also an important basis for calculating the short-circuit current and protection setting of the transformer;
(1) The larger the impedance voltage of the transformer, the smaller the short-circuit current flowing through the transformer when the secondary side of the transformer is short-circuited, and the lighter the impact on the transformer. Therefore, the current owner has requirements for the minimum short-circuit impedance value when the transformer is manufactured. However, the impedance voltage of the transformer increases, which has higher requirements on the manufacturing process;
(2) The greater the impedance voltage of the transformer, the greater the variation of the voltage on the load side of the transformer when the load changes, and the poor voltage stability;
(3) The greater the impedance voltage of the transformer, the greater the reactive power consumed by the transformer winding under the same load during operation.
If the transformer data is said to be a three-winding transformer data then:
High-medium: 39.1%, indicating that the impedance voltage of the transformer's high-voltage winding to the medium-voltage winding is 39.1%;
High-low: 20.5%, indicating that the impedance voltage of the high-voltage winding of the transformer to the low-voltage winding is 20.5%;
Medium-low: 18.6%, indicating that the impedance voltage of the transformer's medium-voltage winding to the low-voltage winding is 18.6%. No, it depends to some extent on the quality of raw materials and accessories. For the quality evaluation of raw material and outsourced (outsourced) component suppliers, the Procurement Section of the Manufacturing Department submits an application, and the Quality Assurance Department organizes relevant personnel from the procurement, design, and process departments to form an evaluation team to evaluate the quality of the suppliers, according to the evaluation results. Determine whether to issue a qualification certificate for qualified suppliers, and include qualified suppliers in the list of qualified suppliers after being approved by the general manager
Purchase of transformer raw materials
According to the importance of raw materials and their components on product quality, the design department will classify them into A, B, and C categories (critical, important, general); And adopted the method of quality assurance system and product quality certification for its manufacturers; thirdly, the production of important raw materials and components was supervised by inspectors on site, and on this basis, a strict incoming inspection system was carried out.
responsibility to people
In the production process, all important processes are employed with certificates, and the dynamic process of product manufacturing has quality control cards (QC cards). Implementing the management system of "fixing posts and appointing people, assigning responsibilities to people, and clear rewards and punishments" throughout the company has enhanced the quality awareness of each employee and ensured the manufacturing quality of each process.
Strictly implement the system of "three presses" and "three inspections"
Three presses, that is, according to drawings, enterprise standards, and process regulations, not only require the operator to manufacture quality to meet the standards and drawings requirements, but also the operation process and operation methods must follow the process regulations; three inspections, namely "self-inspection, mutual inspection, Special inspection", during the quality assurance special inspection process, the products or components that are determined to be unqualified shall be handled in strict accordance with the "Unqualified Product Control Procedures".
Transformer inspection and control
To improve the inspection level, the quality of the product is ultimately evaluated by various test data. In order to improve the accuracy of the test data, the main test instruments and meters used by our company for inspection are all advanced equipment at home and abroad, with international advanced inspection level. .
Turn off good product testing
Strictly follow national standards and IEC standards. The test personnel have undergone special business training and are certified to work. One-third of the test personnel are test engineers. After the product test, all parts and components are assembled and accepted by design, process, inspection, sales, and final assembly. After all the products meet the requirements of the drawings and standards, they can be disassembled and shipped.
Scan the QR code to read on your phone
News

Time of issue : 2024-06-14

Time of issue : 2024-06-09

Time of issue : 2024-06-04

Time of issue : 2024-05-30

Add: No. 2, Shashui Village, Laobian, Danzao Town, Nanhai District, Foshan City, Guangdong Province, China
Tel:+86-13431672143/86-13229275711/+86-18603093593
Fax:+86-757-8109-2137
WhatsApp:+86-13695195603/86-13229275711/+86-18603093593
Email:zjx@shengtetransformer.com
Email:owen@shengtetransformer.com
Email:juanie@shengtetransformer.com
Code:528000
Website:www.senttransformer.com
