The automatic operation flow of the monitoring system for the transition of the hydroelectric generating unit from cold standby to repair and drainage to the spiral case and tail horizontal pressure

Abstract

The application discloses a water power station unit automatic operation process from cold standby to maintenance and drainage to a volute and tail horizontal pressure monitoring system, which comprises receiving a start order; sending a quick closing instruction to a unit water inlet quick door; sending a full opening technical water supply positive and negative water supply valve instruction to a unit technical water supply control cabinet; sending a full opening pressure reducing valve inlet and outlet valve instruction to the technical water supply control cabinet; sending a full opening technical water supply filter inlet and outlet valve instruction to the technical water supply control cabinet; sending a generator outlet switch from cold standby to maintenance instruction to the unit; sending a generator and transformer group outlet switch from cold standby to maintenance instruction to the unit; and ending the operation process after detecting that the unit technical water supply total flow is less than 50m³ / s. The application improves manual step-by-step operation into an automatic operation process, avoids system live grounding or equipment damage caused by equipment lockout failure, ensures the accuracy of the whole operation process, ensures the safety and stability of the power grid, improves work efficiency and saves human resources.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of operation of hydroelectric generating set, and particularly relates to an automatic operation process of a monitoring system for water drainage to a spiral case and tail horizontal pressure of a hydroelectric generating set from cold standby to maintenance. BACKGROUND

[0002] The maintenance of a hydroelectric generating set requires a series of operations such as switching the outlet switch of the generator and the outlet switch of the generator transformer from maintenance to upstream quick door, pressure steel pipe and spiral case drainage, etc. When the above safety measures are performed by the operation personnel, they are generally manually operated, which is time-consuming and laborious, and there are many operation lockouts and matters needing attention. In particular, when the operation lockouts of the equipment of the outlet switch, the isolation switch and the grounding switch on both sides of the switch fail, it may cause the system to be live grounded or the equipment to be damaged, which brings hidden dangers to the safe and stable operation of the power grid and is not conducive to safety production.

[0003] Currently, the operation of the equipment for water drainage to the spiral case and tail horizontal pressure of the hydroelectric generating set from cold standby to maintenance is generally performed by the operation personnel in the monitoring system and on site after the operation conditions are met. The entire process is performed by the operator. The main problems at present are:

[0004] ①When the equipment is operated from cold standby to maintenance for the first time, the operation personnel need to monitor the system and the on-site equipment for double confirmation before and after each operation step, and there are high requirements for the operation sequence. When the operation sequence is incorrect and the equipment operation lockout fails, it may cause the system to be live grounded or the equipment to be damaged, which brings hidden dangers to the safe and stable operation of the power grid.

[0005] ②The maintenance of the hydroelectric generating set requires a plurality of operation tasks such as switching the generator transformer from maintenance to upstream quick door, pressure steel pipe and spiral case drainage, which are generally manually performed by the operation personnel, which is time-consuming and laborious. SUMMARY

[0006] The present application aims at the deficiencies of the prior art and provides an automatic operation process of a monitoring system for water drainage to a spiral case and tail horizontal pressure of a hydroelectric generating set from cold standby to maintenance. The process fully utilizes the program condition execution judgment and the scientific and reasonable automatic process to perform the equipment operation such as the outlet switch, the isolation switch, the grounding switch, the water inlet quick door and the technical water supply electric valve during the operation process of the hydroelectric generating set from cold standby to maintenance and water drainage to the spiral case and tail horizontal pressure. The operation time is shortened, the strength of the operator is reduced, the entire operation process is accurate, and the safety production management level of the power plant is improved.

[0007] The technical purpose of the present application is achieved by the following technical scheme: an automatic operation process of a monitoring system for water drainage to a spiral case and tail horizontal pressure of a hydroelectric generating set from cold standby to maintenance, comprising the following steps:

[0008] Step 1, receive operation flow start order, detect whether the following operation conditions are met: the unit is in shutdown state, the water inlet quick door control cabinet mode is in remote, the technical water supply control cabinet mode is in remote, and the technical water supply automation device is fault-free. If yes, proceed to Step 2, if not, alarm and exit the operation flow;

[0009] Step 2, send a quick closing instruction to the unit water inlet quick door to make the quick door complete the quick closing action. If the quick door full closing indication is not met, report quick closing timeout and exit the flow. If the quick door full closing signal meets all conditions, proceed to Step 3;

[0010] Step 3, send a full open technical water supply positive and negative water valve instruction to the unit technical water supply control cabinet. Detect whether the technical water supply positive and negative water valve is fully open. If the condition is not met, prompt operation failure and alarm to exit the operation flow. If all conditions are met, proceed to Step 4;

[0011] Step 4, send a full open pressure reducing valve inlet and outlet valve instruction to the technical water supply control cabinet. Detect whether the technical water supply pressure reducing valve inlet valve is fully open. If the condition is not met, prompt operation failure and alarm to exit the operation flow. If all conditions are met, proceed to Step 5;

[0012] Step 5, send a full open technical water supply filter inlet and outlet valve instruction to the technical water supply control cabinet. Detect whether the technical water supply filter inlet and outlet valve is fully open. If the condition is not met, prompt operation failure and alarm to exit the operation flow. If all conditions are met, proceed to Step 6;

[0013] Step 6, send a generator outlet switch from cold standby to maintenance instruction to the unit. Detect whether the generator outlet switch is open and the generator outlet switch breaker is pulled open. If the conditions are met, close the generator outlet switch ground breakers on both sides. Then detect whether the generator outlet switch ground breakers on both sides are pushed up. If not, prompt operation failure and alarm to exit the operation flow. If all conditions are met, proceed to Step 7;

[0014] Step 7, send a generator and transformer outlet switch from cold standby to maintenance instruction to the unit. Detect whether the generator and transformer outlet switch is open and the generator and transformer outlet switch breaker is pulled open. If the conditions are met, close the generator and transformer outlet switch ground breakers on both sides. Then detect whether the generator and transformer outlet switch ground breakers on both sides are closed. If the condition is not met, prompt operation failure and alarm to exit the operation flow. If all conditions are met, proceed to Step 8;

[0015] Step 8, detect whether the unit technical water supply total flow is less than 50 m³ / s. If not, continue to Step 8. If all conditions are met, end the operation flow.

[0016] Preferably, in step 6, if the generator is not installed with the outlet switch unit, directly jump to step 7.

[0017] Compared with the prior art, the present application has the following beneficial effects:

[0018] The water power station unit provided by the present application is automatically operated by the cold standby to maintenance and drainage to the spiral case and tail horizontal pressure monitoring system, the operation process performed by the operator is improved to an automatic operation process, the system is prevented from being grounded or the equipment is prevented from being damaged when the equipment lockout fails, the entire operation process is ensured to be accurate and reliable, the safety and stability of the power grid are ensured, the work efficiency is improved, and the human resources are saved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The flow chart of the automatic operation process of the water power station unit from cold standby to maintenance and drainage to the spiral case and tail horizontal pressure monitoring system in an embodiment of the present application. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0021] Reference Figure 1 , Figure 1 The flow chart of the automatic operation process of the water power station unit from cold standby to maintenance and drainage to the spiral case and tail horizontal pressure monitoring system in an embodiment of the present application, in the description of the present application, the generator outlet switch is also called GCB, and the generator transformer outlet switch is also called CCB. As a preferred embodiment of the present application, the present embodiment provides an automatic operation process of a water power station unit from cold standby to maintenance and drainage to the spiral case and tail horizontal pressure monitoring system, including the following steps:

[0022] Step 1, receiving an operation process start order, detecting whether the following operation conditions are met: the unit is in a shutdown state, the water inlet door control cabinet mode is in a remote state, the technical water supply control cabinet mode is in a remote state, and the technical water supply automation device is fault-free. If yes, proceed to step 2, if not, alarm and exit the operation process;

[0023] Step 2, issuing a fast closing instruction to the water inlet door of the unit to make the fast door complete the fast closing action. If the fast door full closing indication is not met, an alarm is given for fast closing time out, and the process is exited. If the fast door full closing signal meets all the conditions, proceed to step 3;

[0024] Step 3, send a full open technical water supply positive and negative water valve instruction to the unit technical water supply control cabinet, detect whether the technical water supply positive and negative water valve has been fully opened, if the condition is not met, prompt operation failure and alarm exit operation process, if all conditions are met, proceed to step 4;

[0025] Step 4, send a full open pressure reducing valve inlet and outlet valve instruction to the technical water supply control cabinet, detect whether the technical water supply pressure reducing valve inlet valve has been fully opened, if the condition is not met, prompt operation failure and alarm exit operation process, if all conditions are met, proceed to step 5;

[0026] Step 5, send a full open technical water supply filter inlet and outlet valve instruction to the technical water supply control cabinet, detect whether the technical water supply filter inlet and outlet valve has been fully opened, if the condition is not met, prompt operation failure and alarm exit operation process, if all conditions are met, proceed to step 6;

[0027] Step 6, send a generator outlet switch from cold standby to maintenance instruction to the unit, detect whether the generator outlet switch is open and the generator outlet switch breaker is pulled open, if the condition is met, close the generator outlet switch on both sides of the ground breaker, then detect whether the generator outlet switch on both sides of the ground breaker is pushed up, if not, prompt operation failure and alarm exit operation process, if all conditions are met, proceed to step 7;

[0028] Step 7, send a generator and transformer outlet switch from cold standby to maintenance instruction to the unit, detect whether the generator and transformer outlet switch is open and the generator and transformer outlet switch breaker is pulled open, if the condition is met, close the generator and transformer outlet switch on both sides of the ground breaker, then detect whether the generator and transformer outlet switch on both sides of the ground breaker is closed, if the condition is not met, prompt operation failure and alarm exit operation process, if all conditions are met, proceed to step 8;

[0029] Step 8, detect whether the unit technical water supply total flow is less than 50m³ / s, if not, continue to step 8, if all conditions are met, end the operation process.

[0030] When the above embodiment is executed to step 8, when it is detected whether the unit technical water supply total flow is less than 50m³ / s, it is indicated that the drainage is completed, the volute and the tail water level are the same, and the volute and the tail water reach the flat pressure state.

[0031] It should be noted that the present application sets a "unit transfer maintenance and drainage to volute and tail horizontal pressure" button in the computer monitoring system, and designs a logic diagram in the computer monitoring system to determine whether the basic operation conditions of the operation process are met, and the nine conditions of "unit in shutdown state", "generator outlet switch protection normal", "generator outlet switch protection normal", "generator outlet switch control mode in remote", "generator outlet switch control mode in remote", "generator outlet switch tripping position", "generator outlet switch tripping position", "generator outlet switch isolation knife switch tripping position", "generator outlet switch isolation knife switch tripping position", "depressurizing valve control cabinet remote control mode", "depressurizing valve control cabinet power normal", "water filter control cabinet remote control mode", "water filter control cabinet power normal" are all met, and the light is turned on to prompt the operator to one-key operation to start the operation process of the present application. In addition, after each specific operation, the system receives feedback signals in the control system, for example, the fast closing instruction is sent to the unit water inlet door, and when the fast door completes the fast closing action, the system receives the fast door state signal, that is, whether it is in the full closed state, so as to obtain the detection structure, and for example, after sending the full opening technical water supply valve instruction to the unit technical water supply control cabinet, the system receives the feedback signal of the technical water supply valve, and then judges whether the technical water supply valve has been fully opened.

[0032] In some preferred embodiments, considering that part of the generator is not installed with an outlet switch unit, in step 6 of the present embodiment, if the generator is not installed with an outlet switch unit, it directly jumps to step 7.

[0033] The above process fully utilizes the program condition execution judgment and scientific and reasonable automatic process to execute the operation of the outlet switch, isolation knife switch, grounding knife switch, water inlet door, technical water supply electric valve and other devices in the operation process of the unit from cold standby to maintenance and drainage to volute and tail horizontal pressure. Not only the operation time is shortened, the strength of the operator is reduced, but also the whole operation process is accurate and reliable, which helps to improve the safety production management level of the power plant.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the purpose and scope of the present application, and they should be covered in the scope of the claims of the present application.

Claims

1. A hydroelectric power station unit is converted from cold standby to repair and drained to the volute and tail horizontal pressure monitoring system automatic operation process, characterized in that, The method comprises the following steps: Step 1, receiving an operation flow starting order, detecting whether the following operation conditions are met: the unit is in a shutdown state, the water inlet quick door control cabinet mode is in a remote state, the technical water supply control cabinet mode is in a remote state, and the technical water supply automation device is fault-free, if yes, proceeding to step 2, if no, alarming and exiting the operation flow; Step 2, issuing a quick closing instruction to the unit water inlet quick door to make the quick door complete a quick door closing action, if the quick door full closing indication is not met, then reporting a quick door closing timeout, and the flow exits, if the quick door full closing signal all conditions are met, then proceeding to step 3; Step 3, issuing a full opening technical water supply positive and negative water supply valve instruction to the unit technical water supply control cabinet, detecting whether the technical water supply positive and negative water supply valve has been fully opened, if the condition is not met, then prompting an operation failure and alarming to exit the operation flow, if all conditions are met, then proceeding to step 4; Step 4, issuing a full opening pressure reducing valve inlet and outlet valve instruction to the technical water supply control cabinet, detecting whether the technical water supply pressure reducing valve inlet valve has been fully opened, if the condition is not met, then prompting an operation failure and alarming to exit the operation flow, if all conditions are met, then proceeding to step 5; Step 5, issuing a full opening technical water supply filter inlet and outlet valve instruction to the technical water supply control cabinet, detecting whether the technical water supply filter inlet and outlet valve has been fully opened, if the condition is not met, then prompting an operation failure and alarming to exit the operation flow, if all conditions are met, then proceeding to step 6; Step 6, issuing a generator outlet switch from cold standby to maintenance instruction to the unit, detecting whether the generator outlet switch is open and the generator outlet switch knife switch is pulled open, if the conditions are met, then closing the generator outlet switch two side grounding knife switches, and then detecting whether the generator outlet switch two side grounding knife switches are pushed on, if not, then prompting an operation failure and alarming to exit the operation flow, if all conditions are met, then proceeding to step 7; if the unit is not equipped with an outlet switch, then directly jumping to step 7; Step 7, issuing a generator and transformer outlet switch from cold standby to maintenance instruction to the unit, detecting whether the generator and transformer outlet switch is open and the generator and transformer outlet switch knife switch is pulled open, if the conditions are met, then closing the generator and transformer outlet switch two side grounding knife switches, and then detecting whether the generator and transformer outlet switch two side grounding knife switches are closed, if the condition is not met, then prompting an operation failure and alarming to exit the operation flow, if all conditions are met, then proceeding to step 8; Step 8, detecting whether the unit technical water supply total flow is less than 50 m³ / s, if not, then continuing to execute step 8, if all conditions are met, then ending the operation flow.

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