The oil level in the double element relay can be monitored against a graduated scale on the windows both sides. Our service range includes a wide range of pressure relief valve t-6 and oil surge relay for transformer. The Buchholz relay gas analysis s generated due to a decay of transformer oil will build up in the higher part of the Buchholz container which reasons drop of oil level in it. This surge travels through the pipe and displaces the paddle. Experimental Study on Optimal Configuration of Pressure Relief Device, Pressure and Oil Flow Relay of On-Load Tap-Changer. Besides, taking the center of the calculation area as the model origin, each component is modeled and assembled by the ProE software.
Offered range is used to protect the malfunction developed inside the on load tap changer. 5 Ampere 1 Switch Single Pole Transformer Oil Surge Relay, 230 Volts. A magnetically held paddle attached to the bottom float is positioned in the oil-flow stream between the conservator and transformer tank. If a small amount of gas is found in this relay when the transformer is new (a few months after startup), it is probably just air that has been trapped in the transformer structure and is now escaping; there is little cause for concern. What is principal to reduce earth leakage current with isolation transformer? Developed & Managed by SME Business Services Ltd.
HZ, ZX and JD contributed to the establishment of OLTC and analysis; XC and QZ contribute to the experiment of the OLTC; GL and XY contributed to the simulation of OLTC oil flow characteristics. OSR does not operate under normal gas developed during changing the transformer taps. Oil Surge Relay-OSR responds only by the rate of rising pressure resulting from internal arcing. Figure 33 – Buchholz Relay, Section. The process from the initial separation position to the contact is opposite to this process. Duan, X., Zhao, T., Li, T., Liu, J., Zou, L., and Zhang, L. (2017). A definite cause of the gas bubbles must be determined and corrected before re-energization of the transformer. Volume 10 - 2022 | Study on Oil Flow Surging and Protection Optimization for on Load Tap Changer of Converter Transformer. Some scholars have explored the cooperation between OLTC oil flow surge and nonelectric protection by means of the equivalent test. Mercury switches employed are of a special design to prevent maloperation due to excessive transformer vibration.
Actually, there have been many cases of relay malfunctions, especially oil flow velocity relay. The connection pipe and relay cover should have 1. According to the structure of on-load tap changer provided by the actual converter station and the field measured results, the separation process of the dynamic and static contacts of the main contact and transition contact is finally determined as follows: 1) During the switching process, the main contact quick mechanism rotates a total of 28° (14° on one side), and the rotation angle of its moving contacts during the separation of the moving and static contacts is 26°. Please add weight and delivery pincode to get estimate shipping price. The motion form of boundary is predefined through User-Defined-Function (UDF), and its angular velocity is specified before calculation. When a serious fault occurs, the generation of the gas is so rapid that an oil surge is set up through the relay. Among them, the maximum volume grid scale of the computational domain is 24 mm; since the gap between the moving and stationary contacts is only 1 mm at the beginning and end of the switching process, the grid scale of the corresponding moving and stationary contact surface is set to 0. However, in order to reduce the switching capacity of the auxiliary contact, the transition resistance value should be higher, in order to reduce the circulating current in the switching process. The least operating time of the Buchholz relay is 0.
Every relay is tested at our in-house test bench which is designed and erected, approved and certified by ERDA. This relay specifies inter-turn errors which occur due to heating of the core and assists in the prevention of strict faults. Ding, G., Zhen, C., Chen, Q., Tian, Y., Zhang, Y., and Yu, G. (2016). I would like to know the reason. The process from contact to separation is the opposite.
The on-load tap changer (OLTC) is one of the key components of converter transformer. In order to reduce the breaking capacity of the main contact, the value of transition resistance should be lower. It can be seen that the smaller the transition resistance, the greater the oil flow speed and oil pressure; the greater the load, the greater the oil flow speed and oil pressure; and the greater the arcing energy, the greater the oil flow velocity and oil pressure. Therefore, all structures outside the diaphragms are removed during modeling.
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