机组联锁设置参考标准.doc

机组仪表联锁设置的相关标准 一、公司仪表联锁保护系统管理制度(附件1：) 大机组联锁设置原则 (一) 大机组轴瓦温度联锁：止推瓦温度测量要求每个面设三个测温点，采用三取二联锁。如果只能安装二个测温点，则采用二取二联锁，但必须设置温度报警。支撑瓦温度联锁，机组中无轴系振动联锁保护信号的，设轴瓦温度联锁。在机组中已配置轴系振动联锁保护的，不设支撑瓦温度联锁。但必须设置支撑瓦温度高报警信号。 (二) 大机组油压低低联锁：润滑油压需采用三取二联锁。为了解决油泵切换过程中油压瞬变问题，润滑油压低低联锁逻辑中加3S延时（即润滑油压低低信号持续时间大于3S后才启动联锁）。汽轮机速关油压、动力油压低低联锁：在机组安全保护上，速关油压、动力油压低低有机械保护，无特别要求不设联锁。 润滑油压变送器的取压口须在润滑油总管的末端。 (三) 重要机组透平转速高联锁设置三个独立的转速测量，采取三取二联锁。 (四) 重要大机组都必须设置轴振动、轴位移联锁。同一断面X、Y方向轴振动联锁采取二取二联锁。机组轴位移要求同一端安装三个位移传感器，采取三取二联锁。如果只安装二个位移传感器的采取二取二联锁，必须设置二个位移传感器测量偏差报警。 (五) 对大机组电机三组定子温度设置联锁，但须采取三取二方式，设置温度报警。 (六) 机组停机后的工艺联锁。考虑到现场等因素，应以机组实际运行状态作为工艺联锁启动条件。汽轮机机组用速关油压低低（三取二）做工艺联锁触发信号速关油压低低Machinery Protection Systems API STANDARD 670 FOURTH EDITION, DECEMBER 2000 5.4.2.4 The radial shaft vibration shutdown system shall be field changeable so that one (single logic) or both (dual voting logic – see note) transducer signals must reach or violate the setpoint to activate a shutdown (danger) relay. Dual voting (two-out-of-two) logic shall be standard. Note: In a dual voting logic system, although each channel may have reached or violated its respective shutdown (danger) setpoints at different times, both channels must be jointly and continuously at or above the shutdown (danger) setpoint for the time delay specified in ======================================== 5.4.3.4 The axial position shutdown system shall be field changeable so that one (single logic) or both (dual voting logic, see note following) transducer signals must reach or violate the shutdown (danger) setpoint to actuate the shutdown (danger) relay. Dual voting (two out of two) logic shall be standard. Note: In an axial position dual voting logic system, although each channel may have reached or violated its respective preset shutdown (danger) setpoints at different times, both channels must jointly and continuously be at or above the shutdown (danger) setpoints for the time delay specified in 5.4.1.5.d before t