JPS60198378A - Method of controlling operation of water wheel or pump - Google Patents

Abstract

PURPOSE:To prevent damage to an inlet valve, when the valve starts closing, by quickly closing a guide vane, based on both outputs from a detector, which detects start of closure of the inlet valve, and signals indicating that the main engine is under power generating operation or under pumping-up operation. CONSTITUTION:A runner 2, which is placed in a runner chamber, is directly connected to a generator 4 via a shaft 3. A guide vane 6, which regulates the flow rate to the runner 1, is provided between the runner chamber 1 and a casing 5, while an inlet valve 8, which suspends the water flow when the water wheel is stopped, is placed between the casing 5 and a water pressure steel tube 7. With this situation, when a main engine is under operation in the generating mode or in the pumping-up mode, outputs from a main engine operation detector 9 and from a operation mode detector 10 are input into an AND gate 12. When an inlet valve 8 starts closing, an inlet valve opening detector 11 is operated. With this contrivance, an emergency stop lockout relay 13 can be operated through the AND gate 12.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention is a water turbine or a pump water turbine (hereinafter simply referred to as a water turbine) having an inlet valve and a guide vane, in which the responsibility of blocking water flow is not imposed on the large mouth valve. Regarding an operation control method.

[Technical background of the invention]

FIG. 1 shows a water turbine power generator that has been widely used in the past.

In the same figure, a generator or generator motor (
(hereinafter simply referred to as a generator) is directly connected to the generator. Between the lunch room l and the casing j placed around it,
A guide vane 6 is provided to adjust the amount of water flowing into the lunch room, and an inlet valve is inserted between the casing and the penstock 7 to cut off the water flow when the water wheel is stopped. There is.

In a water turbine power generator having such a configuration, when starting the main engine, the large mouth valve is first fully opened.

In this case, the guide 4-6 is fully closed and the inlet valve g
performs the opening operation without water flow.

Next, the guide vane 6 is gradually opened, water flows into the lunch chamber 1, the main engine is started, and the rotational speed is gradually increased. The speed of the rotating main engine is controlled by adjusting the opening of the guide vane B.

In addition, when stopping the main engine, fully close the guide vane 6 and open the inlet valve ♦ while there is no water flow in the penstock 7.
operate to close.

The large mouth valve g is generally operated by hydraulic pressure, and is controlled so that it is always fully open when the main engine is in operation.

On the other hand, when the main engine suddenly stops due to a mechanical accident, etc., the guide vane 6 and the large mouth valve g start to close at the same time, but the guide vane 6 also closes the large mouth valve g quickly. , the large mouth valve ♂ will not shut off the water flow.

In this way, since the main function of the large mouth valve ♂ is a stop valve, it is controlled to adjust the amount of water flowing and to prevent operations during flowing water as much as possible.

[Problems with background technology]

However, if the artificial valve starts to close due to some unexpected situation while the main engine is operating, the large mouth valve will not be able to shut off the water flow, and the bearing supporting the valve body of the inlet valve, the valve body seal part, or Excessive stress may act on the servo motor for driving the inlet valve and cause significant damage to them.

With conventional control methods, even if the inlet valve starts closing while the main engine is operating, there is no way to detect this, so when the generator output drops, the operator notices this abnormality and takes the stop operation. Otherwise, after the large mouth valve was fully closed, the only option was to detect that the inlet valve was fully open and stop the main engine using a signal from the limit switch for detecting the fully closed inlet valve attached to it. .

However, the inlet valve is already severely damaged even after the water flow has been shut off, and requires overhaul and repair.During this period, the power generation equipment will be forced to stop for a long period of time, so the power plant will be closed. The drawback was that the operating rate decreased, resulting in large losses.

[Purpose of the invention]

The present invention has been made in order to eliminate the above-mentioned drawbacks in the background art, and when the inlet valve starts closing due to an accident or the like while the main engine is operating, this can be immediately detected and necessary measures can be taken. The object of the present invention is to provide a method for controlling the operation of a water turbine, which prevents damage caused by water flow cutoff at an inlet valve by taking measures.

[Summary of the invention]

In order to achieve the above-mentioned object, in the water turbine operation control method of the present invention, when the large mouth valve starts to operate in the closing direction, the output of the detector that detects this, and the output of the detector that detects this, and when the main engine is in power generation operation or pumping operation, are It is characterized by preventing damage to the large mouth valve by triggering the main engine and abruptly closing the guide vane based on a signal indicating that the main engine is closed.

[Embodiments of the invention]

Next, the present invention will be explained in detail with reference to FIG.

In the figure, ri is a main engine operation detector that generates an output signal when the main engine is in a normal operating state, and uses, for example, a governor solenoid.

Reference numeral 10 denotes an operation mode detector that generates an output signal when the main engine is in a mode other than phase adjustment continuous rotation, that is, in a power generation operation mode or a pumping operation mode.

1/ indicates an inlet valve opening degree detector, and is constituted by, for example, a limit switch for detecting the opening degree of the large mouth valve attached to a movable part of the large mouth valve. This artificial valve opening detector
The operating point is set so that output a is produced when the valve is closed.

The output signals of the above-mentioned main engine operating state detector 1, operating mode detector 10, and inlet valve opening degree detector 2 are output from the AND circuit/2.
is input. Is AND circuit 7.2 a detector? , /θ,
When the 1/3 output satisfies the AND condition, an output signal is sent to the lockout relay 13 for sudden stop, and this relay 13 is driven to suddenly close the guide 4-on and suddenly stop the main engine.

In the embodiment of the present invention configured as described above, when the main engine is in normal operation in the power generation mode or pumping mode condition, the outputs of the main engine operation detector 10 and the operation mode detector 10 are input to the AND circuit 2 by human power. has been done. In this case, if the inlet valve is fully opened, the artificial valve opening detector 1/ will not generate an output signal, so the AND circuit will not satisfy the output condition, and the sudden stop lockout relief 3 will not operate. , the main engine continues to operate normally.

However, under the above-mentioned operating conditions, if the artificial valve starts to close due to a drop in the hydraulic pressure controlling the artificial valve or other causes, when the opening of the large opening reaches a predetermined value, the inlet valve detector Since // is activated and produces an output signal, the AND circuit saw satisfies the output condition and activates the sudden stop lockout relay 13. As a result, the main engine control device enters the sudden stop mode, and the guide 4 is suddenly closed to bring the main engine to a sudden stop. At the same time, the generator parallel circuit breaker is opened to disconnect the generator from the power grid. .

As described above, according to the present invention, when the large mouth valve starts to close due to an unexpected situation, the lockout relay for sudden stop operates immediately and suddenly closes the guide vane, so that the flow of water by the artificial valve is prevented. Blockage can be avoided.

In addition, in the above embodiment, an example was explained in which the guide vane is controlled to close suddenly when the AND condition is satisfied by three human forces: the main engine operation detector, the operation mode detector, and the large opening valve opening detector. The invention is not limited to this, but it is possible to suddenly stop the main engine by the 9-hour algorithm, for example, by including the operating mode conditions in the main engine operating conditions.

〔Effect of the invention〕

As described above, according to the method of the present invention, if the artificial valve starts closing operation due to an unexpected situation while the main engine is in power generation or pumping operation involving running water, this (i [immediately detected and guided Since the vane can be suddenly closed and the main engine can be stopped suddenly, damage caused by water flow cutoff at the inlet valve can be avoided.Therefore, the water turbine's sterilization function is increased and the reliability of the main engine operation is improved.

Sweet/ζ, since the artificial valve does not have to take on the responsibility of shutting off water at all, by reducing the crotch pulling pressure, it is possible to economically manufacture servo motors, etc. that are subject to the operating force of the valve body and valve glue 01. It is also possible to reduce the overall cost.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram showing an example of the configuration of a water turbine generator to which the present invention is applied, and FIG. 2 is a block diagram illustrating a control device W used in the method of the present invention. /...Lunch room! ...Lunch, 3...Shaft, Gu...
・Generator, j...casing, 6...guide vane,
7... Penstock, Za... Population valve, Ri... Main engine operation detector, IO... Operation mode detector, ll... Inlet valve opening detector, Saw... AND circuit, /3 ...Lockout relay for sudden stops Applicant's representative Kiyoshi Inomata

Claims (1)

[Scope of Claims] In a water turbine or a pump water turbine equipped with an eight-port valve and a guide vane for flow rate adjustment, the inlet valve is provided with a large-mouth valve opening detector, and when the main engine is in power generation operation or pumping operation, 1. A method for controlling the operation of a water turbine or a pump water turbine, characterized in that when an artificial valve starts to close, this is detected by the inlet valve opening detector and the guide technique is abruptly closed. The method for controlling the operation of a water turbine or a pump water turbine according to claim 1, characterized in that an inlet valve opening detection limit switch attached to the large mouth valve is used as the inlet valve opening detector. 3. A main engine operation detector that detects that the main engine is in normal operating condition, a motion mode detector that detects that the main engine is in power generation operation mode or pumping operation mode, and a main engine operation detector that detects that the main engine is in power generation operation mode or pumping operation mode, and when the large mouth valve is closed to a predetermined opening degree. and an inlet valve opening degree detector that detects this, and when the outputs of these detectors satisfy an AND condition, a lockout relay for sudden stop is operated to suddenly close the guide vane. Range 1
The method for controlling the operation of a water turbine or a pump-turbine according to item 1 or 2.