NGHIÊN CỨU MÔ PHỎNG RƠ LE KỸ THUẬT SỐ CỦA SIEMENS 7UT613 BẢO VỆ SO LỆCH CHO MÁY BIẾN ÁP LỰC=Simulation Study of the Siemens 7UT613 Differential Protection Relay for Power Transformer

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Tác giả: Dung NguyễN Thị ThùY

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Khoa học và công nghệ - Trường Đại học Thành Đông, 2024

Mô tả vật lý: tr.16

Bộ sưu tập: Metadata

ID: 482235

Thêm vào giỏ

Hệ thống bảo vệ máy biến áp bao gồm nhiều loại bảo vệ khác nhau trong đó bảo vệ so lệch sử dụng là bảo vệ chính. Bảo vệ so lệch máy biến áp phải thỏa mãn tiêu chí vừa có độ nhạy cao để bảo vệ máy biến áp khỏi các sự cố, vừa đảm bảo tính chọn lọc để tránh những tác động nhầm gây mất điện. Bài báo trình bày việc nghiên cứu thiết lập mô hình và đánh giá đặc tính làm việc của rơ le kỹ thuật số 7UT613 của hãng Siemens bảo vệ máy biến áp 3 pha 220/110/35 kV dựa trên phần mềm Matlab/Simulink. Việc mô phỏng được tiến hành trong các trường hợp máy biến áp vận hành bình thường, ngắn mạch phía 220 kV, 110 kV, 35 kV và ngắn mạch phía phụ tải. Kết quả đưa ra phân tích, đánh giá bao gồm dòng điện của các cuộn dây cao áp, trung áp và hạ áp đưa vào rơ le
dòng so lệch và dòng hãm
tín hiệu từ khối hãm hài và khối Trip của rơ le.The transformer protection system includes many different types, in which differential protection is the main protection. Differential protection of the transformer must satisfy the criteria of both having high sensitivity to protect the transformer from incidents and ensuring selectivity to avoid erroneous impacts that cause power outages. This paper presents the research to establish a model and evaluate the working characteristics of Siemens digital relay 7UT613 to protect the three-phase transformer 220/110/35 kV based on Matlab/ Simulink. On that basis, it can be adjusted to improve the accurate and reliable operation of the transformer differential protection relay when a fault occurs inside the protection zone. The simulation is conducted in the cases of normal transformer operation, transformer surge, short circuits on the 220 kV, 110 kV, 35 kV sides and short circuits on the load side. The results of analysis and evaluation include the current of the high voltage, medium voltage and low voltage coils fed into the relay
differential current and braking current
signal from the harmonic block and the Trip block of the relay.

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