A system for detecting water blockage of large steam turbine generator stator bars

Abstract

The utility model discloses a kind of detection large-sized steam turbine generator stator bar water blockage systems, including hot water tank, water supply pipeline and backwater pipeline;The hot water tank is communicated with water supply pipeline by branch pipe, the branch pipe is equipped with valve, water supply pipeline is equipped with water pump one, water supply pipeline is communicated with generator stator inlet water collector, the hot water tank is communicated with backwater pipeline by branch pipe, the branch pipe is equipped with valve, backwater pipeline is communicated with generator stator backwater collector, each stator bar is equipped with temperature measuring probe.The utility model utilizes generator stator bar under the condition of blockage, water flow rate reduces, water temperature change comparison exception to identify, according to the water temperature change of each generator bar, determine whether water blockage, detection result is accurate and reliable, equipment is simple, cost is lower, provide basis for further processing, improve the safety reliability of generator.

Description

Technical Field

[0001] This utility model relates to the field of generator maintenance technology, specifically a system for detecting water blockage in the stator bars of a large steam turbine generator. Background Technology

[0002] Currently, generator stator bars are cooled by water. A generator consists of dozens of bars, and even a single bar blocked by water can affect heat dissipation. In severe cases, it can cause damage to the stator coils due to overheating, resulting in economic losses of millions of dollars. Currently, the detection of water blockage in generator stator bars is done using an ultrasonic flow meter to analyze flow changes. However, this method requires disassembling the generator, removing the rotor, and manually inspecting the stator water collection pipe. Disassembling the generator and removing the rotor is a labor-intensive process, requiring approximately ten days for testing. The inspection is time-consuming, labor-intensive, and inefficient. Utility Model Content

[0003] The technical problem this invention aims to solve is to overcome existing defects and provide a system for detecting water blockage in the stator bars of a large steam turbine generator. This system identifies blockage by observing abnormal water flow rates and temperature changes in the stator bars when they are blocked. It determines whether water blockage exists based on the temperature changes of each stator bar. The detection results are accurate and reliable. The equipment is simple and low-cost, providing a basis for further processing and improving the safety and reliability of the generator. This effectively solves the problems in the background technology.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a system for detecting water blockage in the stator bars of a large steam turbine generator, comprising a hot water tank, a water supply pipeline, and a return water pipeline; the hot water tank is connected to the water supply pipeline via a branch pipe equipped with a valve; the water supply pipeline is equipped with a water pump and is connected to the generator stator inlet water collection pipe; the hot water tank is connected to the return water pipeline via a branch pipe equipped with a valve; the return water pipeline is connected to the generator stator return water collection pipe; and each stator bar is equipped with a temperature probe.

[0005] Preferably, it also includes a cold water tank, which is connected to the water supply pipeline via a branch pipe equipped with a valve. The cold water tank is also connected to the return water pipeline via a branch pipe equipped with a valve, and the return water pipeline is equipped with a water pump.

[0006] Preferably, it also includes a temperature measuring instrument, which collects signals from the temperature probes on each stator bar and displays the temperature value.

[0007] Preferably, valves are provided at both the inlet end of the generator stator water inlet manifold and the outlet end of the generator stator water return manifold.

[0008] Preferably, the hot water tank is also equipped with a heater.

[0009] Compared with existing technologies, the beneficial effects of this utility model are as follows: By setting up a hot water tank and a cold water tank, the hot water tank supplies water to the stator bars. If the bars are blocked by water, their water conductivity is poor, and the water is absorbed by the stator, resulting in a lower measured water temperature compared to other bars. When room temperature cold water is introduced into the stator bars, if preheated to raise the stator bar temperature, the water flow rate in the blocked bars is slow. By comparison, the temperature of the blocked bars drops slowly, and the blocked bars can also be identified by comparing the rate of temperature change. The identification method utilizes the abnormal water temperature change caused by the reduced water flow rate in the generator stator bars when they are blocked. Based on the water temperature change of each generator bar, it is determined whether there is water blockage. The detection results are accurate and reliable, the equipment is simple and low in cost, and it provides a basis for further processing, improving the safety and reliability of the generator. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this utility model.

[0011] In the diagram: 1. Hot water tank, 2. Heater, 3. Water supply pipe, 4. Water pump 1, 5. Stator rod, 6. Generator stator return water collection pipe, 7. Generator stator inlet water collection pipe, 8. Cold water tank, 9. Water pump 2, 10. Return water pipe. Detailed Implementation

[0012] The present invention can be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention. In the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "front", "rear", "left", "right" indicating the orientation or positional relationship, they are only corresponding to the drawings of this application for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation.

[0013] Please see Figure 1 The present invention provides the following technical solution:

[0014] Example 1: A system for detecting water blockage in stator bars of a large steam turbine generator, comprising a hot water tank 1, a water supply pipe 3, and a return water pipe 10; the hot water tank 1 is connected to the water supply pipe 3 via a branch pipe, which is equipped with a valve; the water supply pipe 3 is equipped with a water pump 4; the water supply pipe 3 is connected to the generator stator inlet water collection pipe 7; the hot water tank 1 is connected to the return water pipe 10 via a branch pipe, which is equipped with a valve; the return water pipe 10 is connected to the generator stator return water collection pipe 6; each stator bar 5 is equipped with a temperature probe.

[0015] Furthermore, it also includes a thermometer, which collects the signal from the temperature probe on each stator bar 5 and displays the temperature value; valves are provided at the inlet end of the generator stator water inlet pipe 7 and the outlet end of the generator stator water return pipe 6, and a heater 2 is also provided in the hot water tank 1.

[0016] Heater 2 is used to heat the water in hot water tank 1. Hot water flows out of hot water tank 1, passes through valve and water pump 4, and enters generator stator inlet water collection pipe 7, which is then distributed to all stator bars 5. Each bar has a temperature probe that can measure the water temperature. This probe is originally installed in the generator and does not need to be reinstalled. The hot water flows back to hot water tank 1 through stator bar return water collection pipe 6, and then through pipes and valves. The hot water circulates for thirty minutes, and the temperature is recorded by the thermometer every three minutes. A time-temperature curve is plotted for each bar. By comparing the curves, the bar with water blockage has a small water flow and a slow temperature rise. The bar with a slow temperature rise is the bar with water blockage. The abnormal water flow rate and temperature change when the generator stator bars are blocked are used to identify the blockage. The water blockage is determined based on the water temperature change of each generator bar.

[0017] Example 2: Unlike Example 1, it also includes a cold water tank 8. The cold water tank 8 is connected to the water supply pipeline 3 through a branch pipe. The branch pipe is equipped with a valve. The cold water tank 8 is connected to the return water pipeline 10 through a branch pipe. The branch pipe is equipped with a valve. The return water pipeline 10 is equipped with a water pump 9.

[0018] First, hot water is circulated to raise the stator water temperature. When the temperature of the stator bars reaches 50℃, the circulation continues for another 2 hours, allowing the stator bars to absorb a certain amount of heat. Then, the inlet and outlet valves of hot water tank 1 are closed, and the inlet and outlet valves of cold water tank 8 are opened. Water pump 29 is then turned on, allowing room temperature cold water to circulate within the stator bars. The temperature measurement points on the stator bars will cool down due to the cold water circulation. Water-blocked bars have a small water flow and their temperature drops slowly. The cold water is circulated for 30 minutes, and the temperature of all bars is recorded every 3 minutes for 10 times. A temperature-time curve is plotted for each bar. By comparing the curves, the bars with the slow temperature drop are the water-blocked bars. The two curves are compared to verify the results and ensure their accuracy.

[0019] The parts of this utility model not described in detail are prior art. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that this utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects, and are intended to include all changes that fall within the meaning and scope of equivalents in the content of this utility model.

Claims

1. A system for detecting water blockage in the stator windings of a large steam turbine generator, characterized in that: It includes a hot water tank (1), a water supply pipeline (3) and a return water pipeline (10); the hot water tank (1) is connected to the water supply pipeline (3) through a branch pipe, which is equipped with a valve; the water supply pipeline (3) is equipped with a water pump (4); the water supply pipeline (3) is connected to the generator stator inlet water collection pipe (7); the hot water tank (1) is connected to the return water pipeline (10) through a branch pipe, which is equipped with a valve; the return water pipeline (10) is connected to the generator stator return water collection pipe (6); and each stator bar (5) is equipped with a temperature probe.

2. The system for detecting water blockage in the stator windings of a large steam turbine generator according to claim 1, characterized in that: It also includes a cold water tank (8), which is connected to the water supply pipeline (3) through a branch pipe. The branch pipe is equipped with a valve. The cold water tank (8) is connected to the return water pipeline (10) through a branch pipe. The branch pipe is equipped with a valve. The return water pipeline (10) is equipped with a water pump (9).

3. The system for detecting water blockage in the stator windings of a large steam turbine generator according to claim 1, characterized in that: It also includes a temperature measuring instrument, which collects the signal from the temperature probe on each stator bar (5) and displays the temperature value.

4. A system for detecting water blockage in the stator windings of a large steam turbine generator according to claim 1, characterized in that: Valves are provided at the inlet end of the generator stator inlet water collection pipe (7) and the outlet end of the generator stator return water collection pipe (6).

5. A system for detecting water blockage in the stator windings of a large steam turbine generator according to claim 1, characterized in that: The hot water tank (1) is also equipped with a heater (2).

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