传感器运行模式翻译-中英对照
每个格栅前后的布置有传感器，可以提供与格栅进出口处的液位成正比例的信号，这些信号经处理后输出一个与进出口液位差成正比例的信号，当格栅发生堵塞时，格栅进出口的液位差增大，输出的信号成比例增加。当满足下列设定的接点切换信号时，输出一个接点切换信号，控制格栅除污机的运行：
当格栅两组传感器前后液位差都小于0.12m水柱时，在一个预先设定的时间段内，各钢绳牵引格栅除污机由主控制箱内的定时电路控制完成一个向下和向上的循环行程。
当格栅进出口任何一组传感器液位差超过0.12m水柱时，两台格栅除污机投入运行一个或几个周期,直到液位差值降至0.09m水柱以下。
当任一格栅进出口液位差达到0.25m水柱时，向主控室发出远程报警信号。
2） 鼓形滤网液位差控制盘
2.1） 数据
仪表盘数量 8只（每台机4只）
仪表盘电源 380V交流/3相/50Hz
保护等级 IP65
安装 底座
制造 2mm厚钢板,焊接
仪表盘中包括两种不同类型的液位控制系统，每套系统包括两台压力传感器，和一台超声波液位传感器。
2.2） 运行模式
鼓形滤网的两侧进水口和出水口布置有3个一组的液位传感器，可以提供与鼓形滤网进出口两侧液位成正比例的信号，这些信号经处理后输出一个与进出口液位差成正比例的信号当鼓形滤网发生堵塞时，鼓形滤网进口水位高于出口水位，输出信号成比例增加。配置继电接触器，当满足下列设定的接点切换信号时，输出一个接点切换信号，控制鼓形滤网的运行：
当每个取水口鼓形滤网进出口液位差，三个一组液位传感器全部三个都显示小于0.1m水柱时，在一个预先设定的时间段内，鼓形滤网由主控制盘内定时电路控制，低速运行；
当鼓形滤网进出口的三个一组液位差传感器中有一个显示0.1m水柱以上时， 鼓形滤网切换到中速运行；
如果鼓形滤网进出口液位继续上升，三个液位差传感器中有两个显示大于0.2m水柱时，鼓形滤网切换到高速运行；
如果鼓形滤网进出口液位差继续上升，三个一组液位差传感器中有两个显示大于0.3m水柱时，向主控室发出第一个远程报警信号；
如果鼓形滤网进出口液位差继续上升，三个一组液位差传感器中有两个显示大于0.8m水柱时，向主控室发出第二个报警信号；
当鼓形滤网进出口的液位差减小时，鼓形滤网按上述相反的顺序切换到低速运行。
2.3.2 阴极保护设备技术规格
阴极保护原则：保护HPX泵房内的设备采用牺牲阳极块和外加电流法进行阴极保护，牺牲阳极块按5年有效期设计；HPX泵站外的设备采用牺牲阳极块进行保护，牺牲阳极块按15年有效期设计。
HPX泵站内的外加电流阴极保护系统可以完全自动或手动运行，含有四组室内变压整流器。系统能根据潮位 、涂漆保护层厚度和鼓形滤网转速的变化自动调整其输出电流，维持结构电位在预设范围内。设计电流容量有50%的裕度，以保证在其他结构被合并到阴极保护系统中时，仍有足够的备用容量。
低碳钢设计电流密度为110 mA/m2，不锈钢设计电流密度为180 mA/m2。每个进水渠构造中均匀分布12副的镀钛阳极的和4副锌参考电极。参考电极进行控制与监测。电极位于鼓形滤网、导槽和格栅附近。每个阳极和参考电极装在UPVC管为电极提供机械保护。导管用鞍夹固定在水室的混凝土墙上，便于检查和更换。联结参考电极和阳极的电缆都接入放置在操作平台上的聚酯接线箱中，接线箱防护等级为IP67。接线箱置于涂漆的低碳钢支撑架之上。变压整流器中设有测量阳极回路电流及参考电极电位的设备。系统设有远程控制和系统故障的接线端，但是没有单独的阳极失效报警。HPX泵站内的外加电流阴极保护系统包含如下结构的防护：
数量（两台机） 结构
8台 鼓形滤网
16个 闸门
16副 闸门导槽
16台 格栅
16副 钢丝绳牵引固定式格栅除污机导槽
16个 加氯框
1.2).Operation mode
Sensors shall be arranged in front and back of each grid, which may offer the signal in direct proportion with the level of inlet and outlet vent of grid. These signals shall output a signal in direct proportion with the level of inlet and outlet vent after processing. When the grid is blocked, the inlet and outlet vent level difference of the grid increases, and the output signal shall be increased in proportion. When the switching signals of the following contacts are satisfied, output switching signal of a contact, and control the operation of grid spotter:
When the level difference in front and back of the two groups of sensors of grids is smaller than 0.12m water column, in one pre-determined period, each steel rope draws grid spotter and finishes one downwards and upward circulation process which controlled by timing circuit inside the main control cabinet.
When the level difference of inlet and outlet vent of any group of sensor of grid exceeds 0.12m water column, two grids spotter shall put into operation for one or several cycles until the level difference is dropped under the 0.09m water column.
When the level difference of inlet and outlet vent of any grid reach 0.25m water column, it is required to send out the long-range alarm signal to the main control room.
2).Drum shape strainer level difference control panel
2.1).Data
Quantity of instrument panel 8 (4 for each unit)
Power of instrument panel 380V exchange / 3 phases / 50Hz
Protection level IP65
Installation Base
Manufacture steel plate of 2mm, weld
The instrument panel includes two different types of level control equipment: a pressure type and an ultrasonic type.
2.2). Operation mode
The inlet and outlet vent on both sides of the drum shape strainer are arranged with a set of 3 level sensors, which may offer the signal in direct proportion with the level of inlet and outlet vent on both sides of drum shape strainer. These signals shall output a signal in direct proportion with the level of inlet and outlet vent after processing. When the drum shape strainer is blocked, the inlet and outlet vent level difference of the drum shape strainer increases, and the output signal shall be increased in proportion. It is required to dispose the relay contact. When the switching signals of the following contacts are satisfied, output switching signal of a contact, and control the operation of drum shape strainer:
When the inlet and outlet vent level difference of each water intake of drum shape strainer as well as the a set of three level sensor are all smaller than 0.1m water column, in one pre-determined period, drum shape strainer is controlled by a timing circuit control of main control panel and operates at a low speed;
When one of three sensors in the set of level sensor of the inlet and outlet vent of drum shape strainer indicates 0.1m water column above, the drum shape strainer is switched over to the moderate speed operation;
If the inlet and outlet vent of drum shape strainer continues raising, and there are two sensors in three level difference sensor indicate 0.2m water column above, the drum shape strainer is switched over to operate at a high speed;
If the inlet and outlet vent of drum shape strainer continues raising, and there are one sensor in three level difference sensor indicate 0.3m water column above, send out the first long-range alarm signal to the main control room;
If the inlet and outlet vent of drum shape strainer continues raising, and there are two sensors in three level difference sensor indicate 0.8m water column above, send out the second long-range alarm signal to the main control room;
When the inlet and outlet vent of drum shape strainer is reduced, the drum shape strainer is switched over to operate at a low speed in above-mentioned opposite order.
2.3.2 Technical specification of the cathodic protection equipment
The cathodic protection principle: the protection of equipments of HPX pump house adopts cathodic protection of sacrificial anodes blocks and impressed current protection. The design of validity of sacrificial anodes sacrifice shall be 15 years;
The impressed current of cathodic protection of HPX pump protecting system may totally operate in auto or manual process, which is contained in a four chamber transformer rectifier. System may adjust output current automatically according to the change of tide height, thickness of antiabrasion layer and rotational speed of drum shape strainer, and maintain the structure electric potential in preset range. Design capacity of current shall leave 50% of overmeasure, so as to ensure the enough reserve capacity when the other structures are amalgamated in the system of cathodic protection.
The design current density of low carbon steel is about 110mA/m2. Each head race structure shall be arranged with 12 titanium-plated anodes and 4 zinc reference electrodes. The reference electrode operates for consulting and monitoring. The electrode is located around strainer of drum shape, guide groove and grid. Each anode and reference electrode is in UPVC pipe offering mechanical protection for electrode. The pipe is fixed on concrete wall of the water chamber with the saddle clip for easy checking and replacement. Connect the cables of reference electrodes and anode in the polyester junction box on the operating platform. The protection level of junction box is IP67. The junction box is located on the painted low carbon steel supporting frame. The anode circuit current and electric potential of reference electrodes measuring equipment is arranged in the transformer rectifier. The system has the wiring terminal for the long-range controlling and systematic failure, but there is no separate failure alarm of anode. The impressed current of cathodic protection of HPX pump protecting system includes the following protection structure:
Quantity (Two units) Structure
8 drum shape strainer
16 Gate
16 Gate guide groove
16 Grids
16 Steel wire ropes traction fixed grid and spotter guide groove
16 Chlorination frames
2013.6.11