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所在平台: Udemy |
课程主页: https://www.udemy.com/course/acb-circuits-with-protection-relays/
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Coursera 课程《带保护继电器的 ACB 电路》课程总结 本课程是关于空气断路器 (ACB) 电路设计与实施的进阶课程,重点在于理解保护继电器的功能及其应用。 **核心内容概要:** 1. **保护继电器的基本原理与作用:** 保护继电器通过电流互感器 (CT) 和电压互感器 (VT) 监测电气参数,检测故障。在发生故障时,它们会控制 ACB 的安全合闸或跳闸,同时利用其输出信号实现跳闸、指示、反馈和闭锁等功能,从而保证电气系统的安全、协调和可靠运行。 2. **不同类型的保护继电器及其接线:** * **继电器类型:** 涵盖机电式和数字式继电器,用于过电流、接地故障等保护。 * **继电器接线:** 详细讲解 CT、PT 的接线方式,以及像 CAG14 这种带稳定电阻的专用继电器接线。 * **跳闸管理:** 介绍主跳继电器和跳闸回路监督继电器,这些组件对于确保断路器安全可靠的操作至关重要。 3. **具体的保护方案与应用:** * **过电流和接地故障保护:** 使用 CDG31 和 Siemens 7SJ610 等继电器实现。 * **限时充电接地故障保护 (REF):** 使用 CAG14 继电器实现。 * **备用接地故障保护 (SBEF):** 使用数字式继电器 7SJ6612 实现。 * **基于电压的保护:** 包括过电压和欠电压保护,使用 VAGM22 和 P3U30 继电器。 * **带延时的欠电压保护:** 使用 VTT11 定时器实现。 * **主跳继电器和跳闸回路监督 (TCS):** 确保断路器操作的可靠性。 4. **整体课程设计目标:** 本课程提供了一个全面概述,指导学员如何设计和实现一个复杂的 ACB 进相电路,其中包含多种保护功能。 5. **课程实践案例:** 课程系列涵盖了一个 4 极 ACB 进相电路的设计和开发。该电路集成了过电流、接地故障、欠电压和跳闸回路监督等多种保护功能。电路还配备了数字式和机电式继电器、CT、PT 和计量系统,以确保安全和可靠的运行。
ACB Circuits with Protection Relays is an advance course to learn Design & Implementation of ACB Circuit Protection, Understanding relays their applications.1. Protection relays monitor electrical parameters using CTs and VTs to detect faults and control Air Circuit Breakers (ACBs) by allowing safe closing or tripping during faults. Relay outputs are used for tripping, indication, feedback, and interlocking, ensuring safe, coordinated, and reliable operation of the electrical system.2. Protection Relays: Electromechanical and numerical relays for overcurrent, earth fault, and more. - Relay Wiring: CTs, PTs, and specialized relays (CAG14) with stabilizing resistors. - Trip Management: Master trip relay and trip circuit supervision relays ensure safe and reliable breaker operation.3. This Section describes various protection relays and schemes used in electrical systems, including: a. Overcurrent and earth fault protection using CDG31 and Siemens 7SJ610 relays. b. Restricted Earth Fault (REF) protection using CAG14 relay. c. Standby Earth Fault (SBEF) protection using numerical relay 7SJ6612. d. Voltage-based protection (under/over voltage) using VAGM22 and P3U30 relays. e. Under-voltage protection with time delay using VTT11 timer. f. Master trip relay and trip circuit supervision (TCS) for reliable breaker operation.4. Overall, these Section provide a comprehensive overview of designing and implementing a complex ACB incomer circuit with multiple protections.5. This lecture series covers the design and development of a 4-pole ACB incomer circuit with various protections, including overcurrent, earth fault, undervoltage, and trip circuit supervision. The circuit incorporates numerical and electromechanical relays, CTs, PTs, and metering systems to ensure safe and reliable operation.