A speed regulator control oil system online monitoring and analysis system and its working method

Abstract

The present invention discloses an online monitoring and analysis system for a speed regulator control oil system and a working method thereof, which belong to the technical field of hydropower station operation and maintenance. It includes a power oil return monitoring device, a power oil supply monitoring device, a control oil supply monitoring device, a control oil return monitoring device, and an analysis and control device, which are arranged between the monitoring oil pipeline and the pressure oil tank discharge pipe; it can effectively realize the online monitoring of the speed regulating oil system, complete the online real-time monitoring of the power oil supply and return and the control oil supply and return, and send the monitoring results to the analysis and control device in time. The analysis and control device can alarm according to the oil cleanliness exceeding the limit, and notify the operating personnel to perform maintenance in time. The present invention can obtain comprehensive and representative oil samples, save the laboratory testing costs and frequency stipulated by relevant regulations, and can monitor the oil particle size in real time, realize dynamic monitoring of the speed regulator oil, effectively prevent accidental shutdowns due to unqualified oil, and ensure the safe and stable operation of the unit.

Description

Technical Field

[0001] The present invention belongs to the technical field of hydropower station operation and maintenance, and in particular relates to an online monitoring and analysis system for a governor control oil system and a working method thereof. Background Art

[0002] The hydraulic system of the speed governor mainly uses high-precision components such as solenoid valves and servo valves. These components have extremely high requirements for oil quality. The regulations on the oil quality requirements of the speed governor include: GB / T 14541-2005 "Guidelines for the Maintenance and Management of Mineral Steam Turbine Oils for Power Plants", DL / T 1975-2019 "Maintenance Regulations for Oil Used in Hydroturbine Regulation Systems", NB / T 42095-2016 "Basic Technical Conditions for High-pressure Speed ​​Governors of Small Hydropower Units", etc. The regulations stipulate that the oil particle size grade must be below NAS7 and have relatively strict regulations on sampling points.

[0003] In recent years, numerous hydropower units, including some of the largest, have experienced unexpected shutdowns due to servo or solenoid valve jams caused by oil quality issues. These jams have also had a significant impact on the power grid. Subsequent analysis of these incidents revealed that the jams were caused by substandard oil quality or inadequate monitoring of oil particle deterioration. Oil quality monitoring, sampling, and oversight have been plagued by the following issues: unrepresentative sampling points; incomplete oil sampling; excessively long sampling intervals and infrequent sampling; and the inability to dynamically monitor oil quality deterioration. Summary of the Invention

[0004] In order to solve the above-mentioned existing problems, the purpose of the present invention is to provide an online monitoring and analysis system for the speed regulator control oil system and its working method, which can realize online and real-time monitoring of the power oil supply and return oil and the control oil supply and return oil, save the cost and frequency of testing, prevent accidental shutdowns due to unqualified oil, and ensure the safe and stable operation of the unit.

[0005] The present invention is achieved through the following technical solutions:

[0006] The present invention discloses an online monitoring and analysis system for a speed regulator control oil system, comprising a power oil return monitoring device, a power oil supply monitoring device, a control oil supply monitoring device, a control oil return monitoring device, and an analysis and control device;

[0007] The power oil return monitoring device includes a power oil return sampling pipe provided between the pressure oil tank drain pipe and the power oil return pipe, a first power oil return shut-off valve and a second power oil return shut-off valve being provided at both ends of the power oil return sampling pipe, a parallel power oil return monitoring pipe and a power oil return bypass flushing pipe being provided between the first power oil return shut-off valve and the second power oil return shut-off valve, a power oil return bypass shut-off valve being provided on the power oil return bypass flushing pipe, and a power oil return particle size sensor being provided on the power oil return monitoring pipe;

[0008] The power oil supply monitoring device includes a power oil supply sampling tube provided between the pressure oil tank drain pipe and the power oil supply pipe, a first power oil supply shut-off valve and a second power oil supply shut-off valve being provided at both ends of the power oil supply sampling tube, a power oil supply monitoring tube and a power oil supply bypass flushing tube being provided in parallel between the first power oil supply shut-off valve and the second power oil supply shut-off valve, a power oil supply bypass shut-off valve being provided on the power oil supply bypass flushing tube, and a power oil supply particle size sensor being provided on the power oil supply monitoring tube;

[0009] The control oil supply monitoring device includes a control oil supply sampling tube provided between the pressure oil tank drain pipe and the control oil supply pipe, a control oil supply first stop valve and a control oil supply second stop valve being provided at both ends of the control oil supply sampling tube, a control oil supply monitoring tube and a control oil supply bypass flushing tube connected in parallel being provided between the first control oil supply stop valve and the second control oil supply stop valve, a control oil supply bypass stop valve being provided on the control oil supply bypass flushing tube, and a control oil supply particle size sensor being provided on the control oil supply monitoring tube;

[0010] The control oil return monitoring device includes a control oil return sampling pipe provided between the pressure oil tank drain pipe and the control oil return pipe, a control oil return first stop valve and a control oil return second stop valve being provided at both ends of the control oil return sampling pipe, a control oil return monitoring pipe and a control oil return bypass flushing pipe connected in parallel being provided between the first control oil return stop valve and the second control oil return stop valve, a control oil return bypass stop valve being provided on the control oil return bypass flushing pipe, and a control oil return particle size sensor being provided on the control oil return monitoring pipe;

[0011] The power oil return bypass stop valve, the power oil return first stop valve, the power oil return particle size sensor, the power oil return second stop valve, the power oil supply bypass stop valve, the power oil supply first stop valve, the power oil supply particle size sensor, the power oil supply second stop valve, the control oil supply bypass stop valve, the control oil supply first stop valve, the control oil supply particle size sensor, the control oil supply second stop valve, the control oil return bypass stop valve, the control oil return first stop valve, the control oil return particle size sensor and the control oil return second stop valve are respectively connected to the analysis and control device.

[0012] Preferably, a power oil return throttling orifice plate is provided at the inlet of the power oil return monitoring pipe.

[0013] Further preferably, the diameter of the power oil return monitoring pipe is 10 mm, and the diameters of the power oil return sampling pipe and the power oil return bypass flushing pipe are 15 mm.

[0014] Preferably, a power oil supply throttling orifice plate is provided at the inlet of the power oil supply monitoring pipe.

[0015] Further preferably, the diameter of the power oil supply monitoring tube is 10 mm, and the diameters of the power oil supply sampling tube and the power oil supply bypass flushing tube are 15 mm.

[0016] Preferably, a control oil supply throttling orifice plate is provided at the inlet of the control oil supply monitoring pipe.

[0017] Further preferably, the diameter of the control oil supply monitoring tube is 10 mm, and the diameters of the control oil supply sampling tube and the control oil supply bypass flushing tube are 15 mm.

[0018] Preferably, a control oil return throttling orifice plate is provided at the inlet of the control oil return monitoring pipe.

[0019] Further preferably, the diameter of the control oil return monitoring pipe is 10 mm, and the diameters of the control oil return sampling pipe and the control oil return bypass flushing pipe are 15 mm.

[0020] The working method of the above-mentioned governor control oil system online monitoring and analysis system disclosed in the present invention includes:

[0021] When the governor oil system is running, the power oil return, power oil supply, control oil supply and control oil return of the governor are monitored and analyzed online using the power oil return monitoring device, power oil supply monitoring device, control oil supply monitoring device and control oil return monitoring device;

[0022] Open the power oil return bypass shut-off valve, the first power oil return shut-off valve, and the second power oil return shut-off valve. The power oil return oil flows from the power oil return pipe through the power oil return sampling pipe, the power oil return monitoring pipe, and the power oil return bypass flushing pipe for flushing before entering the pressure oil tank drain pipe. Close the power oil return bypass shut-off valve. The power oil return oil particle size sensor monitors the oil cleanliness of the power oil return oil and sends the monitored value to the analysis and control device for comparison with the preset value. When the monitored value exceeds the preset value, a power oil return oil particle size contamination alarm is issued.

[0023] Open the power oil supply bypass shut-off valve, the first power oil supply shut-off valve, and the second power oil supply shut-off valve. The power oil flows from the power oil supply pipe through the power oil supply sampling pipe, the power oil supply monitoring pipe, and the power oil supply bypass flushing pipe for flushing before entering the pressure oil tank drain pipe. Close the power oil supply bypass shut-off valve. The power oil supply particle size sensor monitors the cleanliness of the power oil supply and sends the monitored value to the analysis and control device for comparison with the preset value. When the monitored value exceeds the preset value, a power oil supply particle size contamination alarm is issued.

[0024] Open the control oil supply bypass stop valve, the control oil supply first stop valve and the control oil supply second stop valve, and the control oil supply flows from the control oil supply pipe through the control oil supply sampling pipe, the control oil supply monitoring pipe and the control oil supply bypass flushing pipe for flushing before entering the pressure oil tank drain pipe; close the control oil supply bypass stop valve, and the control oil supply particle size sensor monitors the cleanliness of the control oil supply and sends the monitored value to the analysis and control device for comparison with the preset value. When the monitored value exceeds the preset value, a control oil supply particle size contamination alarm is issued;

[0025] Open the control oil return bypass stop valve, the control oil return first stop valve and the control oil return second stop valve. The control oil return oil flows from the control oil return pipe through the control oil return sampling pipe, the control oil return monitoring pipe and the control oil return bypass flushing pipe for flushing and then enters the pressure oil tank drain pipe; close the control oil return bypass stop valve, and the control oil return oil particle size sensor monitors the oil cleanliness of the control oil return oil, and sends the monitored value to the analysis and control device for comparison with the preset value. When the monitored value exceeds the preset value, a control oil return oil particle size contamination alarm is issued.

[0026] Compared with the prior art, the present invention has the following beneficial technical effects:

[0027] The present invention discloses an online monitoring and analysis system for a speed regulator control oil system, which can effectively realize online monitoring of the speed regulator oil system, complete online real-time monitoring of the power oil supply and return and the control oil supply and return, and promptly send the monitoring results to the analysis and control device. The analysis and control device can alarm according to the oil cleanliness exceeding the limit and promptly notify the operating personnel to perform maintenance. The present invention can obtain comprehensive and representative oil samples and improve the accuracy of the monitoring values ​​by setting a sampling tube between the monitoring oil pipeline and the pressure oil tank drain pipe; a flushing bypass is set on the sampling tube to flush the pipeline and improve the monitoring accuracy; it can save the laboratory testing costs and frequency stipulated by relevant regulations, and can monitor the oil particle size in real time, realize dynamic monitoring of the speed regulator oil, effectively prevent accident shutdowns due to unqualified oil, and ensure the safe and stable operation of the unit.

[0028] The working method of the online monitoring and analysis system for the speed regulator control oil system disclosed in the present invention has a high degree of automation, can obtain comprehensive and representative oil samples, saves manpower and material costs, and has good application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of the overall structure of the online monitoring and analysis system for the speed governor control oil system of the present invention;

[0030] Figure 2 Schematic diagram of the control principle of the present invention.

[0031] In the figure: 1-1 is the power oil return bypass stop valve, 1-2 is the power oil return first stop valve, 1-3 is the power oil return throttling orifice, 1-4 is the power oil return particle size sensor, 1-5 is the power oil return second stop valve; 2-1 is the power oil supply bypass stop valve, 2-2 is the power oil supply first stop valve, 2-3 is the power oil supply throttling orifice, 2-4 is the power oil supply particle size sensor, 2-5 is the power oil supply second stop valve; 3-1 is the control oil supply bypass stop valve, 3-2 is the control oil supply first stop valve, 3-3 is the control oil supply throttling orifice, 3-4 is the control oil supply particle size sensor, 3-5 is the control The second oil supply stop valve; 4-1 is the control oil return bypass stop valve, 4-2 is the control oil return first stop valve, 4-3 is the control oil return throttling orifice, 4-4 is the control oil return particle size sensor, 4-5 is the control oil return second stop valve; 5 is the pressure oil tank, 6 is the return oil tank, 7 is the power oil return pipe, 8 is the power oil supply pipe, 9 is the control oil supply pipe, 10 is the control oil return pipe, 11 is the mechanical overspeed protection device, 12 is the emergency pressure regulating valve, 13 is the section closing valve, 14 is the guide vane main pressure regulating valve, 15 is the guide vane servo, 16 is the guide vane servo valve, 17 is the blade main pressure regulating valve, 18 is the blade servo, 19 is the blade servo valve. DETAILED DESCRIPTION

[0032] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments, which are intended to explain the present invention rather than to limit it:

[0033] The governor hydraulic oil system provides the power source for the speed control system and is primarily divided into two types: control oil and power oil. The control oil, after passing through the electro-hydraulic servo system, amplifies the electrical signal into a hydraulic signal. Its primary function is to provide driving power to the main pressure regulating valve based on the regulation signal. The power oil, after being amplified by the main pressure regulating valve, provides power to the servomotor, which drives the guide vanes to adjust and control the speed and load of the unit.

[0034] The governor hydraulic oil typically uses a pressure oil tank 5 and a return oil tank 6 as primary storage or energy storage devices. The oil pressure control system primarily consists of electrical switch nodes and a controller, responsible for starting and stopping the pressurized oil pump. The main users of the control oil include the guide vane servo valve 16, the propeller blade servo valve 19, the emergency stop solenoid valve, the segment solenoid valve, the emergency solenoid valve, the switching valve, and the mechanical overspeed protection device 11. The main users of the power oil include the emergency pressure regulating valve 12, the segment shutoff valve 13, the guide vane main pressure regulating valve 14, the guide vane servo 15, the propeller blade main pressure regulating valve 17, and the propeller blade servo 18.

[0035] The power oil in the speed governor control system is divided into power oil supply and power oil return. The power oil supply is always pressurized, while the power oil return is pressurized after participating in regulation. The control oil in the speed governor control system is divided into control oil return and control oil supply. The control oil return is pressurized after participating in regulation, while the control oil supply is always pressurized. To facilitate the identification of oil contamination and the monitoring of overall oil quality, the speed governor oil system online monitoring device includes a power oil supply monitoring device, a power oil return monitoring device, a control oil supply monitoring device, and a control oil return monitoring device.

[0036] like Figure 1 The present invention provides an online monitoring and analysis system for a speed governor control oil system, comprising a power oil return monitoring device, a power oil supply monitoring device, a control oil supply monitoring device, a control oil return monitoring device, and an analysis and control device;

[0037] The power oil return monitoring device includes a power oil return sampling pipe disposed between the pressure oil tank drain pipe and the power oil return pipe 7. A first power oil return shut-off valve 1-2 and a second power oil return shut-off valve 1-5 are respectively disposed at both ends of the power oil return sampling pipe. A parallel power oil return monitoring pipe and a power oil return bypass flushing pipe are disposed between the first power oil return shut-off valve 1-2 and the second power oil return shut-off valve 1-5. The power oil return bypass flushing pipe is provided with a power oil return bypass shut-off valve 1-1. A power oil return particle size sensor 1-4 is disposed on the power oil return monitoring pipe.

[0038] The power oil supply monitoring device includes a power oil supply sampling tube provided between the pressure oil tank drain pipe and the power oil supply pipe 8. A first power oil supply shut-off valve 2-2 and a second power oil supply shut-off valve 2-5 are provided at both ends of the power oil supply sampling tube, respectively. A parallel power oil supply monitoring tube and a power oil supply bypass flushing tube are provided between the first power oil supply shut-off valve 2-2 and the second power oil supply shut-off valve 2-5. The power oil supply bypass flushing tube is provided with a power oil supply bypass shut-off valve 2-1. A power oil supply particle size sensor 2-4 is provided on the power oil supply monitoring tube.

[0039] The control oil supply monitoring device includes a control oil supply sampling tube provided between the pressure oil tank drain pipe and the control oil supply pipe 9. A first control oil supply shut-off valve 3-2 and a second control oil supply shut-off valve 3-5 are provided at both ends of the control oil supply sampling tube, respectively. A parallel control oil supply monitoring tube and a control oil supply bypass flushing tube are provided between the first control oil supply shut-off valve 3-2 and the second control oil supply shut-off valve 3-5. The control oil supply bypass flushing tube is provided with a control oil supply bypass shut-off valve 3-1. A control oil supply particle size sensor 3-4 is provided on the control oil supply monitoring tube.

[0040] The control oil return monitoring device includes a control oil return sampling pipe provided between the pressure oil tank drain pipe and the control oil return pipe 10. A first control oil return shut-off valve 4-2 and a second control oil return shut-off valve 4-5 are provided at both ends of the control oil return sampling pipe, respectively. A parallel control oil return monitoring pipe and a control oil return bypass flushing pipe are provided between the first control oil return shut-off valve 4-2 and the second control oil return shut-off valve 4-5. The control oil return bypass flushing pipe is provided with a control oil return bypass shut-off valve 4-1. A control oil return particle size sensor 4-4 is provided on the control oil return monitoring pipe.

[0041] The power oil return bypass stop valve 1-1, the power oil return first stop valve 1-2, the power oil return particle size sensor 1-4, the power oil return second stop valve 1-5, the power oil supply bypass stop valve 2-1, the power oil supply first stop valve 2-2, the power oil supply particle size sensor 2-4, the power oil supply second stop valve 2-5, the control oil supply bypass stop valve 3-1, the control oil supply first stop valve 3-2, the control oil supply particle size sensor 3-4, the control oil supply second stop valve 3-5, the control oil return bypass stop valve 4-1, the control oil return first stop valve 4-2, the control oil return particle size sensor 4-4 and the control oil return second stop valve 4-5 are respectively connected to the analysis and control device.

[0042] The inlet of the power oil return monitoring pipe is equipped with a power oil return throttling orifice plate 1-3. The diameter of the power oil return monitoring pipe is 10mm, and the diameter of the power oil return sampling pipe and the power oil return bypass flushing pipe is 15mm.

[0043] The inlet of the power oil supply monitoring pipe is provided with a power oil supply throttling orifice plate 2-3. The diameter of the power oil supply monitoring pipe is 10mm, and the diameter of the power oil supply sampling pipe and the power oil supply bypass flushing pipe is 15mm.

[0044] A control oil supply throttling orifice plate 3-3 is provided at the inlet of the control oil supply monitoring pipe. The diameter of the control oil supply monitoring pipe is 10 mm, and the diameter of the control oil supply sampling pipe and the control oil supply bypass flushing pipe is 15 mm.

[0045] A control oil return orifice plate 4-3 is provided at the inlet of the control oil return monitoring pipe. The diameter of the control oil return monitoring pipe is 10 mm, and the diameter of the control oil return sampling pipe and the control oil return bypass flushing pipe is 15 mm.

[0046] Working method of the above-mentioned governor control oil system online monitoring and analysis system:

[0047] When the governor oil system is running, the power oil return, power oil supply, control oil supply and control oil return of the governor are monitored and analyzed online using the power oil return monitoring device, power oil supply monitoring device, control oil supply monitoring device and control oil return monitoring device;

[0048] Open the power oil return bypass shut-off valve 1-1, the first power oil return shut-off valve 1-2, and the second power oil return shut-off valve 1-5. The power oil return oil flows from the power oil return pipe 7 through the power oil return sampling pipe, the power oil return monitoring pipe, and the power oil return bypass flushing pipe for flushing before entering the pressure oil tank drain pipe. Close the power oil return bypass shut-off valve 1-1. The power oil return oil particle size sensor 1-4 monitors the oil cleanliness of the power oil return oil and sends the monitored value to the analysis and control device for comparison with the preset value. When the monitored value exceeds the preset value, a power oil return oil particle size contamination alarm is issued.

[0049] Open the power oil supply bypass shut-off valve 2-1, the first power oil supply shut-off valve 2-2, and the second power oil supply shut-off valve 2-5. The power oil flows from the power oil supply pipe 8 through the power oil supply sampling pipe, the power oil supply monitoring pipe, and the power oil supply bypass flushing pipe for flushing before entering the pressure oil tank drain pipe. Close the power oil supply bypass shut-off valve 2-1. The power oil supply particle size sensor 2-4 monitors the cleanliness of the power oil supply and sends the monitored value to the analysis and control device for comparison with the preset value. When the monitored value exceeds the preset value, a power oil supply particle size contamination alarm is issued.

[0050] The control oil supply bypass shut-off valve 3-1, the control oil supply first shut-off valve 3-2, and the control oil supply second shut-off valve 3-5 are opened. The control oil supply flows from the control oil supply pipe 9 through the control oil supply sampling pipe, the control oil supply monitoring pipe, and the control oil supply bypass flushing pipe for flushing before entering the pressure oil tank drain pipe. The control oil supply bypass shut-off valve 3-1 is closed. The control oil supply particle size sensor 3-4 monitors the cleanliness of the control oil supply and sends the monitored value to the analysis and control device for comparison with the preset value. When the monitored value exceeds the preset value, a control oil supply particle size contamination alarm is issued.

[0051] Open the control oil return bypass stop valve 4-1, the control oil return first stop valve 4-2 and the control oil return second stop valve 4-5, and the control oil return oil flows from the control oil return pipe 10 through the control oil return sampling pipe, the control oil return monitoring pipe and the control oil return bypass flushing pipe for flushing before entering the pressure oil tank drain pipe; close the control oil return bypass stop valve 4-1, and the control oil return oil particle size sensor 4-4 monitors the oil cleanliness of the control oil return oil, and sends the monitored value to the analysis and control device for comparison with the preset value. When the monitored value exceeds the preset value, a control oil return oil particle size contamination alarm is issued.

[0052] The present invention will be further explained below with a specific embodiment:

[0053] like Figure 2 The analysis and control device of this embodiment includes an AI input board, a DO1 board, a DO2 board, and 8 KC relays, which complete the tasks of particle size alarm, sensor fault and voltage monitoring. The power oil return oil particle size sensor 1-4 monitors the power oil return oil cleanliness value online and transmits it to the analysis and control device. This value is compared with the set value. When it exceeds the set value, a particle size secondary alarm control relay KC3 is issued. The corresponding node of the KC3 relay is opened to the LCU "power oil return oil particle size pollution secondary alarm"; the power oil supply oil particle size sensor 2-4 monitors the power oil supply oil cleanliness value online and transmits it to the analysis and control device. This value is compared with the set value. When it exceeds the set value, a particle size secondary alarm control relay KC4 is issued. The corresponding node of the KC4 relay is opened to the LCU "power oil supply oil particle size pollution secondary alarm"; The control oil supply particle size sensor 3-4 monitors the control oil supply oil cleanliness value online and transmits it to the analysis and control device. The value is compared with the set value. When it exceeds the set value, a particle size second-level alarm control relay KC5 is issued. The corresponding node of the KC5 relay is opened to the LCU "control oil supply oil particle size pollution second-level alarm"; the control oil return oil particle size sensor 4-4 monitors the control oil return oil cleanliness value online and transmits it to the analysis and control device. The value is compared with the set value. When it exceeds the set value, a particle size second-level alarm control relay KC6 is issued. The corresponding node of the KC6 relay is opened to the LCU "control oil return oil particle size pollution second-level alarm".

[0054] The above description is merely an embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention, or equivalent structures or equivalent process transformations made using the contents of the present invention's description and drawings, or direct or indirect applications in other related technical fields, should all be covered by the scope of protection of the present invention.

Claims

1. An online monitoring and analysis system for a speed governor control oil system, characterized in that: It includes power oil return monitoring device, power oil supply monitoring device, control oil supply monitoring device, control oil return monitoring device and analysis and control device; The power oil return monitoring device comprises a power oil return sampling pipe provided between a pressure oil tank drain pipe and a power oil return pipe (7), a first power oil return stop valve (1-2) and a second power oil return stop valve (1-5) being provided at both ends of the power oil return sampling pipe, a power oil return monitoring pipe and a power oil return bypass flushing pipe being provided in parallel between the first power oil return stop valve (1-2) and the second power oil return stop valve (1-5), a power oil return bypass stop valve (1-1) being provided on the power oil return bypass flushing pipe, and a power oil return particle size sensor (1-4) being provided on the power oil return monitoring pipe; The power oil supply monitoring device comprises a power oil supply sampling pipe provided between a pressure oil tank drain pipe and a power oil supply pipe (8), a first power oil supply stop valve (2-2) and a second power oil supply stop valve (2-5) being provided at both ends of the power oil supply sampling pipe, a power oil supply monitoring pipe and a power oil supply bypass flushing pipe being provided in parallel between the first power oil supply stop valve (2-2) and the second power oil supply stop valve (2-5), a power oil supply bypass stop valve (2-1) being provided on the power oil supply bypass flushing pipe, and a power oil supply particle size sensor (2-4) being provided on the power oil supply monitoring pipe; The control oil supply monitoring device comprises a control oil supply sampling pipe arranged between a pressure oil tank drain pipe and a control oil supply pipe (9), a control oil supply first stop valve (3-2) and a control oil supply second stop valve (3-5) being respectively provided at both ends of the control oil supply sampling pipe, a control oil supply monitoring pipe and a control oil supply bypass flushing pipe being provided in parallel between the first control oil supply stop valve (3-2) and the second control oil supply stop valve (3-5), a control oil supply bypass stop valve (3-1) being provided on the control oil supply bypass flushing pipe, and a control oil supply particle size sensor (3-4) being provided on the control oil supply monitoring pipe; The control oil return monitoring device comprises a control oil return sampling pipe provided between a pressure oil tank drain pipe and a control oil return pipe (10); a control oil return first stop valve (4-2) and a control oil return second stop valve (4-5) are provided at both ends of the control oil return sampling pipe; a control oil return monitoring pipe and a control oil return bypass flushing pipe connected in parallel are provided between the first control oil return stop valve (4-2) and the second control oil return stop valve (4-5); a control oil return bypass stop valve (4-1) is provided on the control oil return bypass flushing pipe; and a control oil return particle size sensor (4-4) is provided on the control oil return monitoring pipe; The power oil return bypass stop valve (1-1), the power oil return first stop valve (1-2), the power oil return particle size sensor (1-4), the power oil return second stop valve (1-5), the power oil supply bypass stop valve (2-1), the power oil supply first stop valve (2-2), the power oil supply particle size sensor (2-4), the power oil supply second stop valve (2-5), the control oil supply bypass stop valve (3-1), the control oil supply first stop valve (3-2), the control oil supply particle size sensor (3-4), the control oil supply second stop valve (3-5), the control oil return bypass stop valve (4-1), the control oil return first stop valve (4-2), the control oil return particle size sensor (4-4), and the control oil return second stop valve (4-5) are respectively connected to the analysis and control device.

2. The online monitoring and analysis system for the speed governor control oil system according to claim 1 is characterized in that: A power oil return throttling orifice plate (1-3) is provided at the inlet of the power oil return monitoring pipe.

3. The online monitoring and analysis system for the speed governor control oil system according to claim 2, characterized in that: The diameter of the power oil return monitoring pipe is 10mm, and the diameter of the power oil return sampling pipe and the power oil return bypass flushing pipe is 15mm.

4. The online monitoring and analysis system for the speed governor control oil system according to claim 1, characterized in that: A power oil supply throttling orifice plate (2-3) is provided at the inlet of the power oil supply monitoring pipe.

5. The online monitoring and analysis system for the speed governor control oil system according to claim 4 is characterized in that: The diameter of the power oil supply monitoring tube is 10mm, and the diameter of the power oil supply sampling tube and the power oil supply bypass flushing tube is 15mm.

6. The online monitoring and analysis system for the speed governor control oil system according to claim 1, characterized in that: A control oil supply throttling orifice plate (3-3) is provided at the inlet of the control oil supply monitoring pipe.

7. The online monitoring and analysis system for the speed governor control oil system according to claim 6, characterized in that: The diameter of the control oil supply monitoring tube is 10mm, and the diameter of the control oil supply sampling tube and the control oil supply bypass flushing tube is 15mm.

8. The online monitoring and analysis system for the speed governor control oil system according to claim 1, characterized in that: A control oil return throttling orifice plate (4-3) is provided at the inlet of the control oil return monitoring pipe.

9. The online monitoring and analysis system for the speed governor control oil system according to claim 8, characterized in that: The diameter of the control oil return monitoring pipe is 10mm, and the diameter of the control oil return sampling pipe and the control oil return bypass flushing pipe is 15mm.

10. The operating method of the online monitoring and analysis system for the speed governor control oil system according to any one of claims 1 to 9, characterized in that: include: When the governor oil system is running, the power oil return, power oil supply, control oil supply and control oil return of the governor are monitored and analyzed online using the power oil return monitoring device, power oil supply monitoring device, control oil supply monitoring device and control oil return monitoring device; The power oil return bypass stop valve (1-1), the power oil return first stop valve (1-2) and the power oil return second stop valve (1-5) are opened, and the power oil return oil flows from the power oil return pipe (7) through the power oil return sampling pipe, the power oil return monitoring pipe and the power oil return bypass flushing pipe for flushing before entering the pressure oil tank drain pipe; the power oil return bypass stop valve (1-1) is closed, and the power oil return oil particle size sensor (1-4) monitors the oil cleanliness of the power oil return oil, and sends the monitored value to the analysis and control device for comparison with the preset value. When the monitored value exceeds the preset value, a power oil return oil particle size pollution alarm is issued; The power oil supply bypass stop valve (2-1), the power oil supply first stop valve (2-2) and the power oil supply second stop valve (2-5) are opened, and the power oil supply flows from the power oil supply pipe (8) through the power oil supply sampling pipe, the power oil supply monitoring pipe and the power oil supply bypass flushing pipe for flushing and then enters the pressure oil tank drain pipe; the power oil supply bypass stop valve (2-1) is closed, and the power oil supply particle size sensor (2-4) monitors the cleanliness of the power oil supply oil, and sends the monitored value to the analysis and control device for comparison with the preset value. When the monitored value exceeds the preset value, a power oil supply particle size contamination alarm is issued; The control oil supply bypass stop valve (3-1), the control oil supply first stop valve (3-2) and the control oil supply second stop valve (3-5) are opened, and the control oil supply flows from the control oil supply pipe (9) through the control oil supply sampling pipe, the control oil supply monitoring pipe and the control oil supply bypass flushing pipe for flushing and then enters the pressure oil tank drain pipe; the control oil supply bypass stop valve (3-1) is closed, and the control oil supply particle size sensor (3-4) monitors the cleanliness of the control oil supply oil, and sends the monitored value to the analysis and control device for comparison with the preset value. When the monitored value exceeds the preset value, a control oil supply particle size contamination alarm is issued; The control oil return bypass stop valve (4-1), the control oil return first stop valve (4-2) and the control oil return second stop valve (4-5) are opened, and the control oil return oil flows from the control oil return pipe (10) through the control oil return sampling pipe, the control oil return monitoring pipe and the control oil return bypass flushing pipe for flushing, and then enters the pressure oil tank drain pipe; the control oil return bypass stop valve (4-1) is closed, and the control oil return oil particle size sensor (4-4) monitors the oil cleanliness of the control oil return oil, and sends the monitored value to the analysis and control device for comparison with the preset value. When the monitored value exceeds the preset value, a control oil return oil particle size contamination alarm is issued.

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