傳感器運行模式翻譯-中英對照
每個格柵前后的布置有傳感器，可以提供與格柵進出口處的液位成正比例的信號，這些信號經(jīng)處理后輸出一個與進出口液位差成正比例的信號，當(dāng)格柵發(fā)生堵塞時，格柵進出口的液位差增大，輸出的信號成比例增加。當(dāng)滿足下列設(shè)定的接點切換信號時，輸出一個接點切換信號，控制格柵除污機的運行：
當(dāng)格柵兩組傳感器前后液位差都小于0.12m水柱時，在一個預(yù)先設(shè)定的時間段內(nèi)，各鋼繩牽引格柵除污機由主控制箱內(nèi)的定時電路控制完成一個向下和向上的循環(huán)行程。
當(dāng)格柵進出口任何一組傳感器液位差超過0.12m水柱時，兩臺格柵除污機投入運行一個或幾個周期,直到液位差值降至0.09m水柱以下。
當(dāng)任一格柵進出口液位差達到0.25m水柱時，向主控室發(fā)出遠程報警信號。
2） 鼓形濾網(wǎng)液位差控制盤
2.1） 數(shù)據(jù)
儀表盤數(shù)量 8只（每臺機4只）
儀表盤電源 380V交流/3相/50Hz
保護等級 IP65
安裝 底座
制造 2mm厚鋼板,焊接
儀表盤中包括兩種不同類型的液位控制系統(tǒng)，每套系統(tǒng)包括兩臺壓力傳感器，和一臺超聲波液位傳感器。
2.2） 運行模式
鼓形濾網(wǎng)的兩側(cè)進水口和出水口布置有3個一組的液位傳感器，可以提供與鼓形濾網(wǎng)進出口兩側(cè)液位成正比例的信號，這些信號經(jīng)處理后輸出一個與進出口液位差成正比例的信號當(dāng)鼓形濾網(wǎng)發(fā)生堵塞時，鼓形濾網(wǎng)進口水位高于出口水位，輸出信號成比例增加。配置繼電接觸器，當(dāng)滿足下列設(shè)定的接點切換信號時，輸出一個接點切換信號，控制鼓形濾網(wǎng)的運行：
當(dāng)每個取水口鼓形濾網(wǎng)進出口液位差，三個一組液位傳感器全部三個都顯示小于0.1m水柱時，在一個預(yù)先設(shè)定的時間段內(nèi)，鼓形濾網(wǎng)由主控制盤內(nèi)定時電路控制，低速運行；
當(dāng)鼓形濾網(wǎng)進出口的三個一組液位差傳感器中有一個顯示0.1m水柱以上時， 鼓形濾網(wǎng)切換到中速運行；
如果鼓形濾網(wǎng)進出口液位繼續(xù)上升，三個液位差傳感器中有兩個顯示大于0.2m水柱時，鼓形濾網(wǎng)切換到高速運行；
如果鼓形濾網(wǎng)進出口液位差繼續(xù)上升，三個一組液位差傳感器中有兩個顯示大于0.3m水柱時，向主控室發(fā)出第一個遠程報警信號；
如果鼓形濾網(wǎng)進出口液位差繼續(xù)上升，三個一組液位差傳感器中有兩個顯示大于0.8m水柱時，向主控室發(fā)出第二個報警信號；
當(dāng)鼓形濾網(wǎng)進出口的液位差減小時，鼓形濾網(wǎng)按上述相反的順序切換到低速運行。
2.3.2 陰極保護設(shè)備技術(shù)規(guī)格
陰極保護原則：保護HPX泵房內(nèi)的設(shè)備采用犧牲陽極塊和外加電流法進行陰極保護，犧牲陽極塊按5年有效期設(shè)計；HPX泵站外的設(shè)備采用犧牲陽極塊進行保護，犧牲陽極塊按15年有效期設(shè)計。
HPX泵站內(nèi)的外加電流陰極保護系統(tǒng)可以完全自動或手動運行，含有四組室內(nèi)變壓整流器。系統(tǒng)能根據(jù)潮位 、涂漆保護層厚度和鼓形濾網(wǎng)轉(zhuǎn)速的變化自動調(diào)整其輸出電流，維持結(jié)構(gòu)電位在預(yù)設(shè)范圍內(nèi)。設(shè)計電流容量有50%的裕度，以保證在其他結(jié)構(gòu)被合并到陰極保護系統(tǒng)中時，仍有足夠的備用容量。
低碳鋼設(shè)計電流密度為110 mA/m2，不銹鋼設(shè)計電流密度為180 mA/m2。每個進水渠構(gòu)造中均勻分布12副的鍍鈦陽極的和4副鋅參考電極。參考電極進行控制與監(jiān)測。電極位于鼓形濾網(wǎng)、導(dǎo)槽和格柵附近。每個陽極和參考電極裝在UPVC管為電極提供機械保護。導(dǎo)管用鞍夾固定在水室的混凝土墻上，便于檢查和更換。聯(lián)結(jié)參考電極和陽極的電纜都接入放置在操作平臺上的聚酯接線箱中，接線箱防護等級為IP67。接線箱置于涂漆的低碳鋼支撐架之上。變壓整流器中設(shè)有測量陽極回路電流及參考電極電位的設(shè)備。系統(tǒng)設(shè)有遠程控制和系統(tǒng)故障的接線端，但是沒有單獨的陽極失效報警。HPX泵站內(nèi)的外加電流陰極保護系統(tǒng)包含如下結(jié)構(gòu)的防護：
數(shù)量（兩臺機） 結(jié)構(gòu)
8臺 鼓形濾網(wǎng)
16個 閘門
16副 閘門導(dǎo)槽
16臺 格柵
16副 鋼絲繩牽引固定式格柵除污機導(dǎo)槽
16個 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