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The last edit to this post was made by It will be more tomorrow_bZzMU on 2020-2-2 at 12:59. Transformers play a very important role both in power generation and distribution; their proper functioning or failures can affect the safe operation of the entire system. Additionally, transformers are expensive devices, so transformers of different capacities require reliable relay protection systems. Allocation of transformer relay protection devices: 1. Primary protection for transformers: differential protection and gas protection. Differential protection serves to protect against inter-phase short circuits inside the transformer as well as along its bushing connections, as well as against single-phase ground faults in systems with directly grounded neutral points. It can also detect inter-turn short circuits within the transformer’s windings. Gas protection can detect various faults such as inter-winding short circuits inside the transformer, single-phase ground faults at the neutral point connected directly to the system side, turns short circuits in the windings, overheating of the core or other components, and oil leakage. 2. Transformer backup protection; backup protection typically includes zero-sequence protection, overcurrent protection, and overload protection. In addition, there are also protections for oil temperature and oil level monitoring, as well as protection for the neutral point gap. Selection of Transformer Relay Protection 1. Selection of relay protection for main transformers: http://www.weijizongbao.com/d/file/e63bb8cd47997db4bedc96b71ccf428c.png 2. Selection of relay protection for distribution transformers: 1. For 10KV distribution projects, our company’s 9521 transformer protection and control device or 9421 transformer protection and control device can be used; both of these devices feature standard 104 protocol communication interfaces as well as 485 communication interfaces. 2. For 35KV, 66KV, and 110KV applications, our company’s 972 line protection and control device or 9671 transformer protection and control device can be utilized; these devices have 103 protocol Ethernet communication interfaces in addition to 485 communication interfaces. Download of transformer relay protection diagrams: 1. Instructions, schematic diagrams, and wiring diagram for distribution transformer protection and control devices! (Click to download) Instructions, schematic diagrams, and wiring diagrams for 9421 transformer protection and control device; instructions, schematic diagrams, and wiring diagrams for 9521 transformer protection and control device; instructions, schematic diagrams, and wiring diagrams for 972 transformer protection and control device; instructions, schematic diagrams, and wiring diagrams for 972C comprehensive transformer protection device. 2. Instructions, schematic diagrams, and wiring diagrams for main transformer protection and control devices! (Click to download) Instructions, schematic diagrams, and wiring diagrams for 992 main transformer differential protection device; instructions, schematic diagrams, and wiring diagrams for 981 main transformer high-level backup protection device; instructions, schematic diagrams, and wiring diagrams for 983 main transformer low-level backup protection device