Unit in overhaul condition pressure oil tank pressure online setting method

Abstract

The application discloses a kind of online setting method of pressure oil tank pressure under unit maintenance condition, and the application identifies that the pressure measuring element of pressure oil tank of hydraulic system of speed regulator under unit maintenance condition has online setting condition, changes output oil pressure by starting pressurizing pump control device to carry out online setting, executes the online setting flow of pressure measuring element of pressure oil tank under unit maintenance condition, realizes the online setting function of pressure measuring element of pressure oil tank.

Description

Technical Field

[0001] This invention relates to the field of pressure setting technology for hydraulic system pressure tanks in speed governors, specifically to a method for online pressure setting of pressure tanks during unit maintenance. Background Technology

[0002] The pressure monitoring of the hydraulic system pressure tank in the speed governor mainly employs automated pressure measurement components such as pressure switches and pressure sensors. The pressure switches primarily monitor high, low, and excessively low pressure signals from the pressure tank, participating in low oil pressure shutdown protection control for unit emergencies. The pressure sensors mainly monitor analog signals of the pressure tank pressure, used for real-time monitoring of system pressure and control of oil pump replenishment. The current system mainly suffers from the following problems:

[0003] (1) Currently, pressure measuring elements can only be calibrated when disassembled, and online inspection and calibration are not possible. Frequent disassembly and installation are not only time-consuming and labor-intensive, but also cause human error in contacting the nodes due to their high sensitivity. The sealing performance requirements are relatively high, and frequent disassembly will damage the original good sealing structure, which may lead to leakage or oil leakage.

[0004] (2) During the annual maintenance period, important automated components will be sent to the metrology agency for verification. Due to the large shaking during transportation, it is easy to damage the verified nodes.

[0005] (3) The laboratory or testing instruments cannot realistically simulate the actual operating scenario of the equipment on site during calibration. Summary of the Invention

[0006] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a method for online pressure setting of the pressure tank of a unit under maintenance conditions, so as to solve the problems mentioned in the background art.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by this invention is: a method for online pressure setting of a pressure tank in a generator unit under maintenance conditions, which includes the following steps:

[0008] Step S1: Obtain the unit's operating condition as maintenance condition, check the operation of the pressurization control device, and ensure that the connection between the pump outlet of the pressurization control valve device and the pressurization test pipe is normal;

[0009] Step S2: Start the pressurization pump control device and check that the operation and function indicators of the pressurization pump control device are normal; if the pressurization pump control device increases the oil pressure, proceed to step S3; if the pressurization pump control device decreases the oil pressure, proceed to step S13.

[0010] Step S3: Increase the oil pressure through the pressurization pump control device and confirm whether the oil pressure has reached the predetermined pressure value; execute steps S4, S7, and S10 respectively.

[0011] Step S4: Determine whether the valve before the pressure switch 1 of the pressure tank is open; if yes, continue to step S5; if no, manually open the valve before the pressure switch 1 of the pressure tank.

[0012] Step S5: Determine whether the pressure value of the pressure tank is greater than the set value of pressure switch 1, i.e., Pn>Psetdz1 (set value of pressure switch 1) ±Pset1 (action error value); if yes, the pressure switch 1 of the pressure tank is operating accurately, and the pressurization pump control device displays relevant signals; if no, proceed to step S6.

[0013] Step S6: Reset the action setting value of pressure switch 1 in the pressure tank and execute step S3;

[0014] Step S7: Determine whether the valve before the pressure switch 2 gauge of the pressure oil tank is open; if yes, continue to step S8; if no, manually open the valve before the pressure switch 2 gauge of the pressure oil tank.

[0015] Step S8: Determine whether the pressure value of the pressure tank is greater than the reset setting value of pressure switch 2, i.e., Pn>Psetfg2 (reset setting value of pressure switch 2) ±Pset2 (reset error value); if yes, the pressure switch 2 of the pressure tank has been reset accurately, and the pressurization pump control device displays relevant signals; if no, proceed to step S9.

[0016] Step S9: Reset the pressure switch 2 of the pressure tank to the set value node and execute step S3;

[0017] Step S10: Determine whether the valve before the pressure sensor gauge of the pressure tank is open; if yes, continue to step S11; if no, manually open the valve before the pressure sensor gauge of the pressure tank.

[0018] Step S11: Determine if the pressure sensor value Ps = Pn (theoretical sample value) + ΔP (allowable error value); if yes, it means the pressure sensor is collecting pressure during the upper stroke normally; if no, proceed to step S12.

[0019] Step S12: Readjust the parameter configuration of the pressure sensor in the pressure tank and proceed to step S3;

[0020] Step S13: Reduce the oil pressure using the pressurization pump control device and confirm whether the oil pressure has reached the predetermined pressure value; execute steps S14, S17, and S20 respectively.

[0021] Step S14: Determine whether the valve before the pressure switch 1 of the pressure oil tank is open; if so, continue to execute Step S15; if not, manually open the valve before the pressure switch 1 of the pressure oil tank.

[0022] Step S15: Determine whether the pressure value of the pressure oil tank is less than the reset set value of the pressure switch, that is, Pn < Psetfg1 (reset setting value) ± Pset2 (reset error value); if so, the pressure switch 1 of the pressure oil tank resets accurately, and the pressurized pump control device displays relevant signals; if not, execute Step S16.

[0023] Step S16: Re-tune the reset setting value node of the pressure switch 1 of the pressure oil tank, and execute Step S13.

[0024] Step S17: Determine whether the valve before the pressure switch 2 of the pressure oil tank is open; if so, continue to execute Step S18; if not, manually open the valve before the pressure switch 2 of the pressure oil tank.

[0025] Step S18: Determine whether the pressure value of the pressure oil tank is less than the action set value of the pressure switch, that is, Pn < Psetdz2 (action setting value) ± Pset2 (action error value); if so, the pressure switch 2 of the pressure oil tank acts accurately, and the pressurized pump control device displays relevant signals; if not, execute Step S19.

[0026] Step S19: Re-tune the action setting value node of the pressure switch 2 of the pressure oil tank, and execute Step S13.

[0027] Step S20: Determine whether the valve before the pressure sensor of the pressure oil tank is open; if so, continue to execute Step S21; if not, manually open the valve before the pressure sensor of the pressure oil tank.

[0028] Step S21: Determine whether the pressure sensor of the pressure oil tank Ps = Pn (theoretical sampling value) + △P (allowable error value); if so, it means that the pressure downstroke acquisition of the pressure sensor of the pressure oil tank is normal; if not, execute Step S22.

[0029] Step S22: Re-adjust the parameter configuration of the pressure sensor of the pressure oil tank, and execute Step S13.

[0030] Preferably, the pressure switch 1 is defined as the high oil pressure of the pressure oil tank, its setting value is 6.7 Mpa, its node acts when the pressure gradually rises, and its node resets when the pressure gradually decreases.

[0031] Preferably, the pressure switch 2 is defined as the low oil pressure of the pressure oil tank, its setting value is 5.2 Mpa, its node resets when the pressure rises, and its node acts when the pressure decreases.

[0032] Preferably, the method for readjusting the pressure sensor parameter configuration of the pressure tank in step S22 is to adjust the zero-point and full-point values ​​of the analog input value of the pressure sensor on the touch screen of the speed controller cabinet.

[0033] The beneficial effects of this invention are:

[0034] This invention confirms that the pressure measuring element of the governor hydraulic system pressure tank has the conditions for online adjustment under unit maintenance conditions. The output oil pressure is changed by starting the pressurization pump control device to perform online adjustment, and the online adjustment process of the pressure measuring element of the pressure tank under unit maintenance conditions is executed to realize the online adjustment function of the pressure measuring element of the pressure tank. Attached Figure Description

[0035] Figure 1 This is a flowchart illustrating a method for monitoring and adjusting pressure components in a pressure tank, adaptable to different operating conditions of the unit.

[0036] Figure 2 This is a flowchart illustrating a method for online monitoring and control of pressure in a pressure tank of a generating unit under operating conditions.

[0037] Figure 3 This is a flowchart illustrating a method for online pressure setting of a pressure tank during unit maintenance.

[0038] Figure 4 This is a schematic diagram of a process for an online monitoring and control system for the pressure of a pressure tank in a generator unit under operating conditions. Detailed Implementation

[0039] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0040] like Figure 3 As shown, a method for online pressure setting of a pressure tank during unit maintenance includes the following steps:

[0041] Step S1: Obtain the unit's operating condition as maintenance condition, check the operation of the pressurization control device, and ensure that the connection between the pump outlet of the pressurization control valve device and the pressurization test pipe is normal;

[0042] Step S2: Start the pressurization pump control device and check that the operation and function indicators of the pressurization pump control device are normal; if the pressurization pump control device increases the oil pressure, proceed to step S3; if the pressurization pump control device decreases the oil pressure, proceed to step S13.

[0043] Step S3: Increase the oil pressure through the pressurization pump control device and confirm whether the oil pressure has reached the predetermined pressure value; execute steps S4, S7, and S10 respectively.

[0044] Step S4: Determine whether the valve before the pressure switch 1 of the pressure tank is open; if yes, continue to step S5; if no, manually open the valve before the pressure switch 1 of the pressure tank.

[0045] Step S5: Determine whether the pressure value of the pressure tank is greater than the set value of pressure switch 1, i.e., Pn>Psetdz1 (set value of pressure switch 1) ±Pset1 (action error value); if yes, the pressure switch 1 of the pressure tank is operating accurately, and the pressurization pump control device displays relevant signals; if no, proceed to step S6.

[0046] Step S6: Reset the action setting value of pressure switch 1 in the pressure tank and execute step S3;

[0047] Step S7: Determine whether the valve before the pressure switch 2 gauge of the pressure oil tank is open; if yes, continue to step S8; if no, manually open the valve before the pressure switch 2 gauge of the pressure oil tank.

[0048] Step S8: Determine whether the pressure value of the pressure tank is greater than the reset setting value of pressure switch 2, i.e., Pn>Psetfg2 (reset setting value of pressure switch 2) ±Pset2 (reset error value); if yes, the pressure switch 2 of the pressure tank has been reset accurately, and the pressurization pump control device displays relevant signals; if no, proceed to step S9.

[0049] Step S9: Reset the pressure switch 2 of the pressure tank to the set value node and execute step S3;

[0050] Step S10: Determine whether the valve before the pressure sensor gauge of the pressure tank is open; if yes, continue to step S11; if no, manually open the valve before the pressure sensor gauge of the pressure tank.

[0051] Step S11: Determine if the pressure sensor value Ps = Pn (theoretical sample value) + ΔP (allowable error value); if yes, it means the pressure sensor is collecting pressure during the upper stroke normally; if no, proceed to step S12.

[0052] Step S12: Readjust the parameter configuration of the pressure sensor in the pressure tank and proceed to step S3;

[0053] Step S13: Reduce the oil pressure using the pressurization pump control device and confirm whether the oil pressure has reached the predetermined pressure value; execute steps S14, S17, and S20 respectively.

[0054] Step S14: Determine whether the valve before the pressure switch 1 of the pressure tank is open; if yes, continue to step S15; if no, manually open the valve before the pressure switch 1 of the pressure tank.

[0055] Step S15: Determine whether the pressure value of the pressure oil tank is less than the reset set value of the pressure switch, that is, Pn < Psetfg1 (reset setting value) ± Pset2 (reset error value); if so, the pressure switch 1 of the pressure oil tank resets accurately, and the pressurizing pump control device displays relevant signals; if not, then execute Step S16;

[0056] Step S16: Re - set the reset setting value node of the pressure switch 1 of the pressure oil tank, and execute Step S13;

[0057] Step S17: Determine whether the front - valve of the pressure switch 2 of the pressure oil tank is open; if so, continue to execute Step S18; if not, manually open the front - valve of the pressure switch 2 of the pressure oil tank;

[0058] Step S18: Determine whether the pressure value of the pressure oil tank is less than the action set value of the pressure switch, that is, Pn < Psetdz2 (action setting value) ± Pset2 (action error value); if so, the pressure switch 2 of the pressure oil tank acts accurately, and the pressurizing pump control device displays relevant signals; if not, then execute Step S19;

[0059] Step S19: Re - set the action setting value node of the pressure switch 2 of the pressure oil tank, and execute Step S13;

[0060] Step S20: Determine whether the front - valve of the pressure sensor of the pressure oil tank is open; if so, continue to execute Step S21; if not, manually open the front - valve of the pressure sensor of the pressure oil tank;

[0061] Step S21: Determine whether the pressure of the pressure sensor of the pressure oil tank Ps = Pn (theoretical sampling value)+△P (allowable error value); if so, it indicates that the downward stroke acquisition of the pressure of the pressure sensor of the pressure oil tank is normal; if not, then execute Step S22;

[0062] Step S22: Re - adjust the parameter configuration of the pressure sensor of the pressure oil tank, and execute Step S13.

[0063] Preferably, the pressure switch 1 is defined as the high oil pressure of the pressure oil tank, its setting value is 6.7 Mpa, its node acts when the pressure gradually rises, and its node resets when the pressure gradually drops.

[0064] Preferably, the pressure switch 2 is defined as the low oil pressure of the pressure oil tank, its setting value is 5.2 Mpa, its node resets when the pressure rises, and its node acts when the pressure drops.

[0065] Preferably, the method of re - adjusting the parameter configuration of the pressure sensor of the pressure oil tank in Step S22 is to adjust the zero value and full - point value of the analog acquisition value of the pressure sensor on the touch - screen of the governor control cabinet.

[0066] Furthermore, the normal pressure value of the pressure tank and pipeline is 6.3 MPa.

[0067] Furthermore, the pressure switch actuation error value is set to 0.1 MPa; the pressure switch reset error value is set to 0.15 MPa; in order to improve the reliability of the pressure switch operation; that is, the pressure switch actuation accuracy must be higher than the reset accuracy.

[0068] Furthermore, the operation is considered normal if the pressure value of the pressure tank is within the range of the pressure switch's set value ± the pressure switch's error value.

[0069] Furthermore, when the pressure of the pressure tank pressure sensor rises or falls, the collected value Ps is considered normal if it is within the range of the theoretical sampling value Pn of the pressure sensor plus the allowable error value △P.

[0070] Furthermore, when resetting the pressure switch node of the pressure tank, adjusting the node nut counterclockwise will increase the contact value, and adjusting the node nut clockwise will decrease the contact value.

[0071] Furthermore, the pressurization pump control device can increase or decrease oil pressure via the control buttons on its control box.

[0072] Furthermore, the pressurization pump control device can start and stop functions, and can stop when the verification is completed or when there is an abnormality.

[0073] Furthermore, when the pressure in the pressure tank is being adjusted online during maintenance, the main oil supply valve and the pressure control valve must be in the closed state, while the pressurization control valve must be in the open state.

[0074] Specifically, the following four examples further illustrate this:

[0075] Example 1:

[0076] like Figure 1 As shown, a method for online monitoring and setting of pressure components in the hydraulic system pressure tank of a speed governor under different operating conditions of a generator unit is disclosed. The method includes:

[0077] Step S1: Obtain the unit operating status from the monitoring system and determine the valve status of the pressure oil tank in the governor's hydraulic system. The unit operating status is mainly divided into unit operation status and unit maintenance status.

[0078] Step S2: Determine whether the unit is in operating condition. If yes, proceed to step S3; otherwise, proceed to step S7.

[0079] Step S3: Determine if the pressure control valve is fully closed. If yes, proceed to step S4; otherwise, proceed to step S7.

[0080] Step S4: Determine whether the main oil valve and the pressure control valve are fully open. If yes, proceed to step S5; otherwise, proceed to step S7.

[0081] Step S5: Confirm that the pressure components of the governor hydraulic system pressure tank are capable of online monitoring and control under unit operating conditions.

[0082] Step S6: Execute the online monitoring and control process for pressure components in the pressure tank under unit operating conditions.

[0083] Step S7: Determine whether the unit is in operating condition. If yes, continue to step S8.

[0084] Step S8: Determine whether the main oil valve and the pressure control valve are fully closed. If yes, proceed to step S9; otherwise, proceed to step S3.

[0085] Step S9: Determine if the pressure control valve and the valve before the gauge are fully open. If yes, continue to step S10; otherwise, proceed to step S4.

[0086] Step S10: Confirm that the pressure measuring element of the governor hydraulic system pressure oil tank is ready for online adjustment under unit maintenance conditions.

[0087] Step S11: Perform the online adjustment procedure for the pressure measuring element of the pressure tank under unit maintenance conditions.

[0088] Furthermore, in the above technical solution, the pressurization control valve, the upstream valve, the main oil valve, and the pressure control valve are all manually controlled to ensure that the on-site equipment must be manually operated and confirmed for control. The pressurization control valve is open during maintenance and closed during unit operation. The upstream valve is open during both unit operation and maintenance. The main oil valve is closed during maintenance and open during unit operation. The pressure control valve is closed during maintenance and open during unit operation. During unit operation, the main oil valve and pressure control valve are open, and the pressurization control valve is closed. During unit maintenance, the main oil valve and pressure control valve are closed, and the pressurization control valve is open.

[0089] Example 2:

[0090] like Figure 2 As shown, a method for online monitoring and control of pressure in a pressure tank of a generating unit under operating conditions includes the following:

[0091] Unit operating condition 1: The system operating conditions are as follows: governor hydraulic system oil pressure is 6.29 MPa, pressure switch 1 setpoint is 6.9 MPa, operating error is 0.1 MPa, and reset error is 0.15 MPa. Under this condition, the online monitoring and control method for governor hydraulic system pressure is as follows:

[0092] Step S1: Determine whether the governor hydraulic system pressure exceeds the normal system pressure value when the unit is in operation. At this time, the governor hydraulic system oil pressure is 7.05 MPa. Determine that the hydraulic system pressure has reached the preset value and continue to execute step S2.

[0093] Step S2: Determine whether the hydraulic system pressure of the speed controller is greater than the set value of pressure switch 1, i.e., Pn>Psetdz1 (set value of pressure switch 1)±Psetdz (action error value). If the hydraulic system pressure is 6.95>6.9+0.1, then proceed to step S3.

[0094] Step S3: Determine whether pressure switch 1 has activated and whether the monitoring system has received a signal. If yes, it indicates that pressure switch 1 has activated accurately and the signal sent to the monitoring system is normal, and the set value of pressure switch 1 is determined to be accurate. If no, it indicates that pressure switch 1 has failed to activate, and the set value of pressure switch 1 is determined to be inaccurate.

[0095] Unit operating condition 2: The system operating conditions are as follows: governor hydraulic system oil pressure is 5.1 MPa, pressure switch 2 setpoint is 5.2 MPa, operating error is 0.1 MPa, and reset error is 0.15 MPa. Under this condition, the online monitoring and control method for governor hydraulic system pressure is as follows:

[0096] Step S1: Determine whether the governor hydraulic system pressure exceeds the normal system pressure value when the unit is in operation. At this time, the hydraulic system pressure is 5.1 MPa, which does not exceed the normal hydraulic system value of 6.3 MPa. Then proceed to step S12.

[0097] Step S12: Determine whether the governor hydraulic system pressure is lower than the normal system pressure value when the unit is in operation. At this time, the hydraulic system pressure is 5.1 MPa, which is lower than the normal hydraulic system value of 6.3 MPa. Continue to execute step S13.

[0098] Step S13: Determine if the hydraulic system pressure of the speed controller is lower than the preset value? If the hydraulic system pressure is 5.1 MPa, which is lower than the set value of pressure switch 2 (5.2 MPa), then continue to step S17.

[0099] Step S17: Determine whether the pressure of the governor hydraulic system is less than the action set value of pressure switch 2, that is, Pn < Psetdz2 (the action setting value of pressure switch 2) ± Psetdz (action error value)? The pressure value of the hydraulic system is 5.1 Mpa, which is lower than the action setting value of pressure switch 2, which is 5.2 Mpa, then execute Step S18;

[0100] Step S18: Determine whether pressure switch 2 has acted and whether the monitoring system has received a signal? The node of pressure switch 2 has acted, indicating that pressure switch 2 has acted accurately and the signal sent to the monitoring system is normal, and it is determined that the setting value of pressure switch 2 is accurately set.

[0101] Unit operating condition 3: When the unit is preparing for maintenance under the operating condition, it is necessary to drain and depressurize the pressure oil tank of the governor hydraulic system. During the depressurization process, the pressure drops from 6.28 Mpa to 0; at the same time, when the unit condition changes from the maintenance condition to the operating condition after the unit is overhauled, it is necessary to perform a pressure boosting operation on the pressure oil tank of the governor hydraulic system. During the pressure boosting process, the pressure rises from 0 to 6.28 Mpa. Under this condition, the online monitoring data of the pressure sensor of the governor hydraulic system is as follows:

[0102] Step S23: Determine whether the pressure oil tank pressure sensor Ps is equal to Pn (theoretical sampling value) + △P (allowable error value). If so, it is determined that the pressure acquisition of the pressure oil tank pressure sensor is normal and sent to the monitoring system. If not, it is determined that the pressure acquisition of the pressure oil tank pressure sensor jumps. As shown in Tables 2 and 3, the sampling value data of the pressure sensor during the unit condition conversion.

[0103] Preferably, the setting value of pressure switch 1 is 6.9 Mpa, its action set value is 6.9 ± 0.1 Mpa, and the return set value is 6.9 ± 0.15 Mpa, which is defined as too high pressure of the pressure oil tank.

[0104] Preferably, the setting value of pressure switch 2 is 5.5 Mpa, its action set value is 5.5 ± 0.1 Mpa, and the return set value is 5.5 ± 0.15 Mpa, which is defined as low oil pressure in the pressure oil tank system.

[0105] Preferably, the setting value of pressure switch 3 is 5.2 Mpa, its action set value is 5.2 ± 0.1 Mpa, and the return set value is 5.2 ± 0.15 Mpa, which is defined as accident low oil pressure of the pressure oil tank.

[0106] Furthermore, under the operating condition of the unit, the normal pressure value of the governor hydraulic system is maintained around 6.3 Mpa. If the oil pressure trend of the hydraulic system drops or rises, the governor oil pump control cabinet is used to maintain the oil pressure of the hydraulic system. If the hydraulic system has an abnormal situation and consumes too much oil to maintain the oil pressure of the hydraulic system, a control signal is triggered through the pressure switch to protect the safe and stable operation of the unit.

[0107] Furthermore, the pressure switch actuation error value is set to 0.1 MPa; the pressure switch reset error value is set to 0.15 MPa; in order to improve the reliability of the pressure switch operation; that is, the pressure switch actuation accuracy must be higher than the reset accuracy.

[0108] Furthermore, the pressure switch is considered to be in normal operation when it operates within the range of the pressure switch operation setting value plus the operation error value; and it is considered to be in normal recovery when it recovers within the range of the recovery error value.

[0109] Furthermore, if the node does not operate when the system pressure is greater than the pressure switch's operating setting value plus the operating error value, it indicates that the pressure switch is malfunctioning; if the node operates when the system pressure is less than the pressure switch's operating setting value plus the operating error value, it indicates that the pressure switch is malfunctioning.

[0110] Furthermore, the setting values ​​of pressure switches 1, 2, and 3 can be adjusted according to the system pressure design requirements, and the number of pressure switches can be adjusted according to the unit protection control and water turbine backup protection control requirements of the monitoring system.

[0111] Furthermore, the pressure sensor of the pressure tank has an allowable error value of 0.05 MPa. It generally adopts a high-precision sensor to accurately collect the pressure of the pressure tank for controlling the start / stop and loading / unloading of the oil pump.

[0112] Furthermore, when the sampled value of the pressure sensor Ps in the pressure tank is greater than or less than Pn (theoretical sampled value) + ΔP (allowable error value), it is considered an abnormal jump in the data collected by the pressure sensor.

[0113] Furthermore, the unit operating conditions are divided into normal operating conditions and maintenance conditions. Under normal operating conditions, the pressure of the governor hydraulic system pressure tank can be monitored using automated pressure tank measuring elements (pressure sensors, mechanical pressure gauges, pressure switches, etc.), including both digital and analog pressure signals. Under maintenance conditions, the automated pressure tank measuring elements (pressure sensors, mechanical pressure gauges, pressure switches, etc.) can be adjusted online without disassembly.

[0114] Furthermore, the normal pressure value of the pressure tank and pipeline is 6.3 MPa. The pressure switch setting values ​​are generally defined as follows: excessive pressure, high pressure, low pressure, excessively low pressure, and emergency low oil pressure, with setting values ​​of 6.9 MPa, 6.5 MPa, 5.7 MPa, 5.5 MPa, and 5.2 MPa, respectively. When the pressure gradually increases, the excessively high pressure and high pressure switches will activate; when the pressure gradually decreases, the low pressure, excessively low pressure, and emergency low oil pressure switches will activate.

[0115] Furthermore, when the pressure in the pressure tank is monitored and controlled online during operation, the main oil supply valve and pressure control valve must be in the open state, and the pressurization control valve must be in the closed state.

[0116] Example 3:

[0117] like Figure 3 As shown, a method for online pressure setting of a pressure tank during unit maintenance is provided. The method includes the following steps:

[0118] Operating Condition 1:

[0119] Step S1: Obtain the unit's operating condition as maintenance condition, check the operation of the pressurization control device, and ensure that the connection between the pump outlet of the pressurization control valve device and the pressurization test pipe is normal.

[0120] Step S2: Start the pressurization pump control device and check that the operation and function indicators of the pressurization pump control device are normal. If the pressurization pump control device increases the oil pressure, proceed to step S3; if the pressurization pump control device decreases the oil pressure, proceed to step S13.

[0121] Step S3: Increase the oil pressure using the pressurization pump control device, and confirm whether the oil pressure has reached the predetermined pressure value. Execute steps S4, S7, and S10 respectively;

[0122] Step S4: Determine if the valve before the pressure switch 1 gauge of the pressure oil tank is open. If yes, continue to step S5; if no, manually open the valve before the pressure switch 1 gauge of the pressure oil tank.

[0123] Step S5: Determine if the pressure value of the pressure tank is greater than the set value of pressure switch 1, i.e., Pn > Psetdz1 (set value of pressure switch 1) ± Pset1 (action error value). If yes, the pressure switch 1 of the pressure tank is operating accurately, and the pressurization pump control device displays the relevant signal. If not, proceed to step S6.

[0124] Step S6: Reset the pressure tank pressure switch 1 action setting value node and execute step S3.

[0125] Step S7: Determine if the valve before the pressure switch 2 gauge of the pressure oil tank is open. If yes, continue to step S8; if no, manually open the valve before the pressure switch 2 gauge of the pressure oil tank.

[0126] Step S8: Determine if the pressure value of the pressure tank is greater than the reset setting value of pressure switch 2, i.e., Pn > Psetfg2 (reset setting value of pressure switch 2) ± Pset2 (reset error value). If yes, the pressure switch 2 of the pressure tank has reset accurately, and the pressurization pump control device displays relevant signals. If not, proceed to step S9.

[0127] Step S9: Reset the reset setting value node of the pressure oil tank pressure switch 2, and execute Step S3.

[0128] Step S10: Determine whether the front valve of the pressure sensor of the pressure oil tank is open? If yes, continue to execute Step S11; if not, manually open the front valve of the pressure sensor of the pressure oil tank.

[0129] Step S11: Determine whether the pressure of the pressure oil tank pressure sensor Ps = Pn (theoretical sampling value) + △P (allowable error value)? If yes, it means that the pressure upstroke acquisition of the pressure oil tank pressure sensor is normal; if not, execute Step S12.

[0130] Step S12: Readjust the parameter configuration of the pressure oil tank pressure sensor, and execute Step S3.

[0131] Step S13: Control the oil pressure to decrease through the pressurizing pump control device, and confirm whether the oil pressure reaches the predetermined pressure value. Execute Step S14, Step S17, and Step S20 respectively;

[0132] Step S14: Determine whether the front valve of the pressure switch 1 of the pressure oil tank is open? If yes, continue to execute Step S15; if not, manually open the front valve of the pressure switch 1 of the pressure oil tank.

[0133] Step S15: Determine whether the pressure value of the pressure oil tank is less than the reset setting value of the pressure switch, that is, Pn < Psetfg1 (reset setting value) ± Pset2 (reset error value)? If yes, the pressure switch 1 of the pressure oil tank resets accurately, and the pressurizing pump control device displays relevant signals. If not, execute Step S16.

[0134] Step S16: Reset the reset setting value node of the pressure switch 1 of the pressure oil tank, and execute Step S13.

[0135] Step S17: Determine whether the front valve of the pressure switch 2 of the pressure oil tank is open? If yes, continue to execute Step S18; if not, manually open the front valve of the pressure switch 2 of the pressure oil tank.

[0136] Step S18: Determine whether the pressure value of the pressure oil tank is less than the action setting value of the pressure switch, that is, Pn < Psetdz2 (action setting value) ± Pset2 (action error value)? If yes, the pressure switch 2 of the pressure oil tank acts accurately, and the pressurizing pump control device displays relevant signals. If not, execute Step S19.

[0137] Step S19: Reset the action setting value node of the pressure switch 2 of the pressure oil tank, and execute Step S13.

[0138] Step S20: Determine if the valve before the pressure sensor gauge of the pressure tank is open. If yes, continue to step S21; if no, manually open the valve before the pressure sensor gauge of the pressure tank.

[0139] Step S21: Determine if the pressure sensor Ps = Pn (theoretical sample value) + ΔP (allowable error value). If yes, it means the pressure sensor's pressure stroke acquisition is normal; otherwise, proceed to step S22.

[0140] Step S22: Readjust the pressure sensor parameter configuration of the pressure tank and proceed to step S13.

[0141] Example 4:

[0142] like Figure 4 As shown, an online monitoring and control system for the pressure of a generator unit's oil tank under operating conditions is disclosed. The system includes: a monitoring system, a fiber optic repeater, an information acquisition module, a PLC controller, a power supply module, and a touch screen.

[0143] The information acquisition module is mainly used to collect signals from the pressure switch and pressure sensor of the hydraulic system pressure tank of the speed governor. The pressure switch and pressure sensor are connected to the information acquisition module by hard wiring.

[0144] The PLC controller is used to process the signals sent by the information acquisition module and perform logic processing. The PLC controller communicates with the information acquisition module via network cable and with the monitoring system via fiber optic cable, with fiber optic repeaters used for relaying where necessary.

[0145] The touchscreen communicates with the PLC controller via a network cable and is mainly used to display the PLC controller's processing results, pressure switch action event records, and pressure sensor data.

[0146] The power module provides power to the PLC controller, touch screen, fiber optic repeater, information acquisition module, pressure switch, and pressure sensor.

[0147] The power module, information acquisition module, touch screen, and fiber optic repeater are installed in the speed controller hydraulic system control cabinet.

[0148] The monitoring system is a power plant-side monitoring system that can realize the emergency shutdown protection and control functions of the unit.

[0149] Furthermore, since the information acquisition module, PLC controller, and touch screen are installed within a distance of no more than one kilometer, they use network cable communication for communication; since the monitoring system and PLC controller are located at a greater distance, they use fiber optic communication to improve communication reliability and real-time performance.

[0150] Furthermore, the information acquisition module adopts a multi-channel high-speed FPGA acquisition card, which has a PCIE interface with a transmission speed of 533MB / s; a bandwidth (-3dB) of 80MHz; a conversion accuracy of 12 bits; a maximum sampling rate of 200Msps / s; input ranges of ±1V, ±2.5V, and ±5V; input AC / DC; adjustable input impedance; and input overvoltage protection of ±10V.

[0151] Furthermore, the PLC controller is configured with a CPU module, a power supply module, an AI module, a DI module, and a communication module. The PLC controller preferentially uses the BMEP582020 CPU module, BMXCPS2010 power supply module, BMX DDI 1602 DI module, BMX DRA 1605 DO module, BMX NRP 0201 communication module, BMX AMI 0410 AI module, BMX AMO 0410 AO module, and BMXEAE0300 SSI module.

[0152] Furthermore, the industrial control computer preferably uses Schneider Electric's HMI GTO5310.

[0153] Furthermore, the power module is a WEIDMULLER brand PRO DM 20, 20A.

[0154] In addition, the online setting test data of the pressure switch of the pressure tank under the maintenance operation condition of the unit is shown in Table 1 below. It can be seen from the data that the pressure switch operates accurately each time, and its action hysteresis value is much smaller than the standard value. Its return hysteresis value is also much smaller than the standard value, indicating that the accuracy of the verification by the method of the present invention is greatly improved and the success rate of verification is 100%.

[0155] Table 1 Historical data of hydraulic system pressure switches (three sets of pressure switches) when the unit is in operation and then switched from maintenance to operation.

[0156]

[0157] Finally, the pressure sensor data verification records during the unit's operating condition transition are shown in Tables 2 and 3. It can be seen that when switching from maintenance to operation, the linearity, accuracy, and efficiency of the pressure sensor verification are all improved, and the collected results are all qualified, demonstrating the effectiveness of the method of the present invention.

[0158] Table 2 Pressure Sensor Data Verification Record During Unit Operating Condition Transition - Part 1

[0159]

[0160] Table 3 Pressure Sensor Data Verification Record During Unit Operating Condition Transition (Part 2)

[0161]

[0162] The above embodiments are merely preferred technical solutions of the present invention and should not be considered as limitations on the present invention. The embodiments and features described in these embodiments can be arbitrarily combined without conflict. The scope of protection of the present invention should be limited to the technical solutions described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A method for online setting of pressure of a pressure oil tank in a maintenance working condition of a unit, characterized in that: It comprises the following steps: Step S1: Obtain the unit condition as a maintenance condition, check the operation of the pressurizing control device, and ensure that the pump outlet of the pressurizing control valve device is normally connected with the pressurizing pressure measuring pipe; Step S2: Start the pressurizing pump control device, check the operation and function indication of the pressurizing pump control device, if the pressurizing pump control device increases the oil pressure, step S3 is executed, if the pressurizing pump control device reduces the oil pressure, step S13 is executed; Step S3: Increase the oil pressure through the pressurizing pump control device, and confirm whether the oil pressure reaches a predetermined pressure value; steps S4, S7 and S10 are executed respectively; Step S4: Judge whether the pressure tank pressure switch 1 table front valve is opened; if yes, step S5 is executed, if no, manually open the pressure tank pressure switch 1 table front valve; Step S5: Judge whether the pressure tank pressure value is greater than the pressure switch 1 action setting value, i.e. Pn>Psetdz1±Pset1; if yes, the pressure tank pressure switch 1 action is accurate, and the pressurizing pump control device displays the related signal; if no, step S6 is executed; wherein, Psetdz1 is the pressure switch 1 action setting value, and Pset1 is the action error value; Step S6: Re-set the pressure tank pressure switch 1 action setting value node, and execute step S3; Step S7: Judge whether the pressure tank pressure switch 2 table front valve is opened; if yes, step S8 is executed, if no, manually open the pressure tank pressure switch 2 table front valve; Step S8: Judge whether the pressure tank pressure value is greater than the pressure switch 2 reset setting value, i.e. Pn>Psetfg2±Pset2; if yes, the pressure tank pressure switch 2 reset is accurate, and the pressurizing pump control device displays the related signal; if no, step S9 is executed; wherein, Psetfg2 is the pressure switch 2 reset setting value, and Pset2 is the reset error value; Step S9: Re-set the pressure tank pressure switch 2 reset setting value node, and execute step S3; Step S10: Judge whether the pressure tank pressure sensor table front valve is opened; if yes, step S11 is executed, if no, manually open the pressure tank pressure sensor table front valve; Step S11: Judge whether the pressure tank pressure sensor Ps=Pn+△P; if yes, it is indicated that the pressure tank pressure sensor pressure upstroke collection is normal; if no, step S12 is executed; wherein, Pn is a theoretical sampling value, and △P is an allowable error value; Step S12: Re-adjust the pressure tank pressure sensor parameter configuration, and execute step S3; Step S13: Reduce the oil pressure through the pressurizing pump control device, and confirm whether the oil pressure reaches a predetermined pressure value; steps S14, S17 and S20 are executed respectively; Step S14: Judge whether the pressure tank pressure switch 1 table front valve is opened; if yes, step S15 is executed, if no, manually open the pressure tank pressure switch 1 table front valve; Step S15: judging whether the pressure tank pressure value is less than the pressure switch reset setting value, i.e. Pn < Psetfg1 ± Pset2; if yes, the pressure tank pressure switch 1 reset is accurate, and the pressurizing pump control device displays the related signal; if no, step S16 is executed; wherein, Psetfg1 is the reset setting value, and Pset2 is the reset error value; Step S16: resetting the pressure tank pressure switch 1 reset setting value node, and executing step S13; Step S17: judging whether the pressure tank pressure switch 2 front valve is opened; if yes, step S18 is executed; if no, the pressure tank pressure switch 2 front valve is manually opened; Step S18: judging whether the pressure tank pressure value is less than the pressure switch action setting value, i.e. Pn < Psetdz2 ± Pset2; if yes, the pressure tank pressure switch 2 action is accurate, and the pressurizing pump control device displays the related signal; if no, step S19 is executed; wherein, Psetdz2 is the action setting value, and Pset2 is the action error value; Step S19: resetting the pressure tank pressure switch 2 action setting value node, and executing step S13; Step S20: judging whether the pressure tank pressure sensor front valve is opened; if yes, step S21 is executed; if no, the pressure tank pressure sensor front valve is manually opened; Step S21: judging whether the pressure tank pressure sensor Ps = Pn + △P; if yes, it is indicated that the pressure tank pressure sensor pressure downstroke collection is normal; if no, step S22 is executed; wherein, Pn is the theoretical sampling value, and △P is the allowable error value; Step S22: resetting the pressure tank pressure sensor parameter configuration, and executing step S13.

2. The method according to claim 1, wherein the method is characterized in that: The pressure switch 1 is defined as the pressure tank oil pressure high, the setting value thereof is 6.7 Mpa, the node thereof is acted when the pressure gradually rises, and the node thereof is reset when the pressure gradually falls.

3. The method according to claim 1, wherein the method is characterized in that: The pressure switch 2 is defined as the pressure tank oil pressure low, the setting value thereof is 5.2 Mpa, the node thereof is reset when the pressure rises, and the node thereof is acted when the pressure falls.

4. The method according to claim 1, wherein the method is characterized in that: The method of resetting the pressure tank pressure sensor parameter configuration in step S22 is adjusting the zero point value and the full point value of the pressure sensor analog quantity collection value on the governor control cabinet touch screen.

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