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Abstract: The leaking pump is the drainage system of the hydropower plant. In this paper, the control system of the leaking pump in the hydropower station is developed. The control system of the leaking pump in the hydroelectric station Guo Guanghai 1 Kuang Quanzhong 1 Ningbo Baixi Reservoir Management Bureau, Ningbo 315600, Of the core of the safe operation of hydropower plant is very important.This paper analyzes the current status of our country hydropower plant leakage pump control, the advantages and disadvantages of the analysis, and through years of practice on the current common control methods proposed improvements, combined with the current hydropower plant The characteristics of the operation are very suitable for anti-accident measures, which have important reference to the operation, maintenance and technical innovation of the hydropower plant. Keywords: Leakage pump Control Improvement Anti-accident measures Hydropower plant leakage Pump control reliability Direct relationship Hydropower plant Of the safe operation, the control failure can easily lead to the expansion of flooded plant accidents.For a long time, hydropower plants in the initial design and other aspects of the function is completed, and rarely consider the reliability analysis of automatic control, resulting in some power plants in early operation Under-experienced circumstances, the occurrence of pump control failure caused by flooding plant accidents caused by the entire plant equipment Wei Threatening and heavy losses.Therefore, it is necessary to carry on the discussion in this aspect, to carry on the technical transformation and improve the operation and management, and to do the anti-accident measures.The current situation of the pump leakage control The seepage water collecting well in the hydropower plant is used to eliminate the seepage water And domestic sewage are mostly arranged in the bottom of the plant. When the water level is high, the water is discharged to the lower reaches. The drainage device should be automatically controlled. The requirements are as follows: ①The working Water Pump can start and stop automatically to maintain the water level of the catchment well within the specified range; When the working pump fails or the volume of water greatly increases to raise the water level of the sump up to the standby pump start level, it should be automatically put into standby water pump, and alarm .Automatic components at the core is to correctly respond to the catchment water level critical point float signal device. The current control methods are summarized in the following two: Status quo: The traditional local automatic control mode, diagram (the main pump for example) as follows: Float signal operation diagram Function No. Pump stop Normal level Working pump Start Standby pump start And alarm FX-1FX-2FX-3 Status quo: With the improvement of power plant automation and computer monitoring system in hydropower plants in general, the leakage of water Of the control put forward higher requirements to meet the "unattended, less-manned" power plant needs.Therefore, the requirements of the control room PC can monitor and control the leakage pump, in addition to the traditional control requirements, but also to do : ①The host computer can display the state of the collector well and the state of the pump normally. ② The two pumps can automatically alternate to each other, and the general control mode is as follows: The ladder diagram is as follows: The current situation II has improved a lot compared with the status quo, basically reached "No one on duty, fewer people on duty" requirements.But there are obvious flaws.Mainly: ①PC can not continuously display the water collection wells real-time water level, specifically, can only display the water level at three points ②The correctness of the water pump Control depends entirely on the float signal device signal, if the float signal failure, the entire pump control system fails, but the host has no detection .Such as standby pump start floater failure is not detectable, because under normal circumstances, the water level Only to start the water level of the working pump, so long-term standby pump start float does not move, may cause contact rusty stick, really need to action fails, which can easily lead to flooding plant. There are hidden dangers, so that duty officers can not always sit back and relax the first improvement in order to overcome the above two shortcomings, you can increase the level transmitter to achieve present with the transmitter manufacturing process improvements, the accuracy and stability than Float signal to be stronger. Level transmitter output 4 ~ 20mA analog sent to the PLC analog input module, generated by the PLC compared to the middle of three equivalent to three floats: the main pump starts, prepare pump start, stop pump Signal, the main standby pump start signal and the float signal in parallel, stop pump non-signal and the original stop pump float signal in series, that is, the analog start signal and the float start signal of any signal action pump is activated pump, stop pumping any signal is stopped Pump, transmitter to achieve the float standby, to achieve a reliable start and stop the pump.And the transmitter to send the simulation is real-time continuous, real-time response to the collection well water level, really make the collection wells Third, the second improvement Above improvements seem to have foolproof pump control foolproof. However, there are still flaws in the practical application .That is when the stop pump float stuck to death, the PC has always thought that the collection wells in the low The water level, but should stop the pump, even if the main pump, spare pump float action will not start the pump, so that's dangerous.In fact, the pump should only be regarded as stop the condition of the pump also made the conditions, This is unreasonable, and what to do? The second improvement to stop the pump bit strings in the self-protection circuit, to solve the hidden dangers. Two improvements after the control ladder is as follows (pump number one): more than the second The results of this improvement are applied to the Baihe Reservoir Power Plant in Ningbo City.The original design of the power plant is a status quo situation and the plant has been flooded twice in September 2003 and November 2005 since it was put into operation in 2001. According to " The second improvement "since the program has been operating well, no recurrence of the accident. Fourth, measures to prevent accidents ①central control room on duty to step up supervision, pay attention to the pump start and stop time changes, measured by the test conditions of leakage For example, when a generator is generating power, the interval between the start of the pump and the generator when the generator is not generating power is increased, and the operation of the pump is increased in the computer monitor to stop the alarm window to remind the operator to monitor. Pumps work regularly. Often, the regular work of the pump includes the start-up test of the pump on the spot, the insulation and lubrication inspection of the pump, but these are the checks of the water pump under normal conditions and the check of the water pump under abnormal conditions. When the water level is too high, check the host computer alarm situation, and then restore the two pumps to check whether the pump can start. This simulated the accident situation, the operator can do once a month .③ Regularly seepage leakage wells. Some float The annunciator can not act reliably because the water in the collection well is too dirty to cause the float to turn over.④If industrial TV monitoring is added, the camera probe is directly aligned with the water collection well.⑤ In the old design, the maintenance water collection well and the leakage water collection well are independent from each other, For example, from the leakage of water wells equipped with standby submersible pumps and the corresponding length of the hose to the maintenance wells, the maintenance of two water pumps wells as a leakage pump backup. [Author] Guo Guanghai, male, 1976 An annual, Hubei Tianmen people, engineers, graduated from the Hydraulics Department of Wuhan University of Hydraulic and Electric Engineering in 1999, now director of Ningbo Baihe Reservoir Management Project Engaged in hydropower plant operation, maintenance and management Address: Town, Ninghai County, Zhejiang Province fork White River Reservoir Authority Zip: 315606 Tel: Fax: Email: