JP3452673B2 - Float type water level transmitter with abnormality detection function - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention detects a water level in a regulating pond or a water tank of a hydroelectric power plant, and stores the detection result in a building of the hydroelectric power plant. Regarding the improvement of the float type water level transmission device that transmits to the installed generator control panel and displays it on the water level gauge of the generator control panel, especially when an abnormality occurs in the float type water level transmission device, The present invention relates to a float type water level transmission device having an abnormality detection function for detecting and issuing an alarm when necessary. 2. Description of the Related Art In a hydroelectric power plant, running water is introduced from a dam, a regulating pond, a water tank, or the like to a water turbine through a hydraulic line to rotate the water turbine, and power is generated by a generator directly connected to the water turbine. . The amount of water flowing into the turbine (generally the output power of the generator)
The water level is controlled in accordance with the amount of water flowing into a dam, a regulating pond, a water tank, or the like. In general, water level adjustment control is performed to keep the water level of the dam, the regulating pond, the water tank, or the like substantially constant. [0003] For such reasons, in a hydroelectric power plant, a regulating pond or the like needs to be provided with a water level transmitting device for detecting the water level. Usually, a float type water level transmitting device is installed, and a hydroelectric power plant is provided. It is an extremely important device for controlling the operation. FIG. 4 is a schematic diagram showing the principle of a conventional float type water level transmitting apparatus. In FIG. 4, reference numeral 1 denotes a float, which floats on the water surface such as a dam, a regulating pond or a water tank, and moves up and down in accordance with the rise and fall of the water surface to detect the water level. Operates as a detector. Its outer shape is formed by joining two hollow right circular cones having the same shape to each other at the periphery of the bottom surface. Reference numeral 2 denotes a pulley, which is supported by a bearing (not shown) at the center thereof and has a rotating shaft 2 integral with the pulley 2.
Although not shown, a groove for winding a wire described later is provided on the peripheral surface thereof. Reference numeral 3 denotes a wire, and a weight 4 is suspended from one end of the wire, an intermediate portion is wound around the groove of the pulley 2 by half a turn, and the other end is attached to the top end of the float 1. Therefore, the float 1 floating on the water surface has
The upward force generated by the weight 4 acts constantly through the wire 3, and the wire 3 does not loosen. Therefore, when the float 1 moves up or down according to the rise or fall of the water level, the With the accompanying movement of the wire 3, the pulley 2 rotates counterclockwise together with the rotating shaft 2a when the water level rises. Reference numeral 5 denotes a potentiometer having terminals at both ends thereof, a resistor 5a formed in a circular shape around the rotation shaft 2a, and a resistor 5a located at the center of the resistor 5a. A slider 5b made of a conductor which is mounted coaxially with an extension of the rotation shaft 2a of the pulley 2 and which is rotated by the rotation of the rotation shaft 2a and slides on the resistor 5a; The terminal 5c is also provided at the base end of the child 5b. In the potentiometer 5 having the above-described structure, an appropriate DC voltage is applied via lead wires 6 connected to both terminals of the resistor 5a, and the potentiometer 5 on the float 1 responding to the rise and fall of the water level. The slider 5b is connected to the resistor 5a by the rotation of the rotating shaft 2a accompanying the rotation of the pulley 2 due to the downward movement.
By rotating while sliding on the upper side, the mechanical movement is converted into an electric signal, and a water level voltage signal corresponding to the water level is obtained from a terminal 5a provided at the base end. [0010] The water level voltage signal thus obtained is
The signal is transmitted to the generator control panel installed in the building of the hydroelectric power plant via the lead wire 6a connected to the terminal 5a, and the water level is displayed on the water level gauge of the generator control panel. In this case, the potentiometer 5 is
Although it acts as a water level signal converter for converting mechanical movement into an electric signal, a cell level oscillator other than a potentiometer may be used as the water level signal converter. [0012] As described above, the water level signal converter (potentiometer or selcin transmitter) of the float type water level transmission device is provided with a mechanical operation due to the function of detecting the water level. Float 1 or pulley 2 is required, but float 1 does not operate due to driftwood floating on the surface of the water, falling leaves in the fall, or freezing of the water in the winter, despite rising and falling of the water surface There is a fear that the rotation of the pulley 2 may be hindered by dust or dust. And the float type water level transmitter is
For the above-mentioned reason, there is a problem that even if a malfunction occurs in which the water level cannot be transmitted accurately, it cannot be detected. Conventionally, as shown in FIG. 4, two float-type water level transmitters each comprising a float, a wire, a pulley, a potentiometer, and the like are provided, and data of the water level transmitted from each of the water level transmitters is monitored. And
If the two data did not match, it was determined that the water level transmitter was defective. However, providing two float type water level transmitters and a monitoring device for constantly monitoring the two data has a problem in terms of cost, and furthermore, maintenance and inspection of those devices require a lot of manpower. It took time and was a problem. The present invention has been made in view of the above circumstances, and an object of the present invention is to use a single float type water level transmission device and to determine whether or not the detected water level data is accurate by itself. An object of the present invention is to provide a float type water level transmitting device having an abnormality detecting function. [0016] In order to achieve the above object, the present invention provides a float, which itself loses its balance and floats on the water surface, and a weight is suspended at one end.
The middle part has a rotating shaft and is wound around a pulley that rotates integrally with the rotating shaft, and the other end is attached to the float and has a wire that holds the float and floats on the water surface while maintaining balance. Container, the float is rotated by the rotating shaft that rotates with the rotation of the pulley due to the upward and downward movement of the float corresponding to the rise and fall of the water surface,
A water level signal converter for outputting a water level signal corresponding to a change in the water level on the water surface, a first electrode attached to the float and always submerged under the water surface, and attached to the float, and the float maintains balance A second electrode that comes into contact with the surface of the water when floating on the surface of the water, and comes out of the surface of the water when the balance is lost and the surface of the water floats on the surface of the water; A third electrode that is above the surface of the water when floating on the surface of the water, and that sinks below the surface of the water when floating above the surface of the water when the balance is lost; and a first electrode connected to the first, second, and third electrodes, An abnormality detection circuit device that detects abnormality of the water level detector based on the presence or absence of electrical conduction between the electrode and the second and third electrodes;
Characterized by comprising: The float itself floats on the water surface as a float for detecting the water level, when the water level detector itself or the water level detector becomes abnormal, but when the water level detector is normal, the balance is maintained. A float is mounted on the float, and three electrodes are attached to the float to detect whether or not the float is in balance. The float balance state is determined by the presence or absence of electrical continuity between the three electrodes. An abnormality detection circuit device for detecting the float level is provided, and the float state is detected by the abnormality detection circuit device. Therefore, the use of one float type water level transmission device determines whether the detected water level data is accurate or not. Judgment is possible. The present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram showing an embodiment of the present invention, FIG. 2 is an exploded connection diagram of an abnormality detection circuit device provided in a generator control panel (not shown) for detecting an abnormality of the device of the present invention, and FIG. It is explanatory drawing for demonstrating the external shape of a float of this invention, an abnormal state, and operation | movement of this invention apparatus. In FIG. 1, the same parts as those in FIG. 4 are denoted by the same reference numerals as those in FIG. 4, and detailed description thereof will be omitted. In FIG. 1, 1 is a float, 2 is a pulley, 2a is a rotating shaft of the pulley 2, 3 is a wire, and 4 is a weight. Reference numeral 5 denotes a potentiometer which operates as a water level signal converter, and a resistor 5a having terminals at both ends thereof.
And a slider 5b having a terminal 5c at a base end thereof, and 6, 6, and 6a are lead wires connected to the respective terminals. In addition, you may use a cell sine oscillator as a water level signal converter. FIG. 1 differs from FIG. 4 only in the float 1 which operates as a water level detector for detecting the water level. The float 1 is different from the conventional float in the following two points. This will be described in detail. (1) In order to detect an abnormality of the float type water level transmitting device, the float 1 itself floats on the water surface irrespective of its external shape when the float 1 itself is floating on the water surface, as shown in FIG.
As shown in the figure, it is manufactured so that one side is submerged in water and loses balance. In use, the wire 3 is displaced from the top end and mounted so as to float on the water surface while maintaining balance as shown in FIG. As a method for breaking the balance of the float 1, as shown in FIG. 4 described above, the outer shape is formed by joining two hollow right circular cones of the same shape to each other at the peripheral edge of each bottom surface. For use, as shown in FIG. 1, a weight 1a having an appropriate weight is attached to one side of the inside so that the position of the center of gravity is deviated to one side. Alternatively, as shown in FIG.
The left and right sides may be manufactured so as to be asymmetrical, one side may be made heavy, and the position of the center of gravity may be biased to one side. When using the float 1, FIG.
As shown in (2), the mounting position of the wire 3 is appropriately selected so as to float on the water surface while maintaining the balance. (2) Three electrodes A, B and C satisfying the following conditions are further mounted on the float 1 whose center of gravity is shifted to one side. (A) A first electrode [A] which is always submerged below the water surface regardless of the balance state of the float 1 floating above the water surface (see FIGS. 1 and 3). (B) When the float 1 floating on the water surface keeps a balanced state, it is always in contact with the water surface, and when the float 1 is out of balance, the second electrode [B] that comes out on the water surface (FIGS. 1 and 3) reference). (C) A third electrode [C] that is always above the water surface when the float 1 floating above the water surface maintains a balanced state, and sinks below the water surface when the balance is out of balance (FIGS. 1 and 3). reference). Next, referring to FIG. 2, an abnormality of the float type water level transmitting apparatus using the three electrodes of the first electrode A, the second electrode B, and the third electrode C is detected. The following describes an abnormality detection circuit device for performing the operation. FIG. 2 is an exploded connection diagram of the abnormality detection circuit device 8 described above. In FIG. 2, P and N are control power buses, A
Is a first electrode, B is a second electrode, C is a third electrode, X,
Y is an auxiliary relay. T is a timed relay, which operates after a predetermined time elapses when an operation command signal is input. When a wave is generated on the water surface by the wind, this time-limit relay T can be used even if the float 1 maintains a balanced state.
The above-mentioned three electrodes are provided in order to prevent erroneous operation because there is a possibility of erroneously determining that the balance is out of balance and erroneous operation upon abnormality detection. Then, the first, second and third electrodes, A,
B and C are connected as shown in FIG. 2, drawn out by a lead wire 9, and guided to an abnormality detection circuit device 8. In addition, auxiliary relays, X, Y and timed relay T, and respective contacts of these relays, X, Y, T, are connected to control power bus P,
Connected between N as shown. By the way, these first, second and third
From the above conditions for three of the electrodes A, B and C of
When the float 1 is in a balanced state, the first
The electrode A and the second electrode B are in a conductive state via "water", and the first electrode A and the third electrode C are in a non-conductive state (see FIG. 1). ). When the float 1 is out of balance, the first electrode A and the second electrode B are in a non-conductive state, and the connection between the first electrode A and the third electrode C is not established. In the meantime,
It becomes conductive through "water" (see FIG. 3). Here, for convenience of explanation, in order to further facilitate understanding of the abnormality detection circuit device, the float 1 is regarded as an auxiliary relay F and "water" is regarded as a movable contact of the auxiliary relay. When the balance is maintained, the auxiliary relay F is considered to be inactive, and when the balance is out of balance, the auxiliary relay F is considered to be operating.
Normally closed contact (b contact) of auxiliary relay F between electrodes B
(Hereinafter referred to as Fb), and the first electrode A and the third electrode
Normally open contact (a contact) of auxiliary relay F between electrodes C
(Hereinafter referred to as Fa). For the above reason, in the developed connection diagram of the abnormality detection circuit device shown in FIG. 2, the first, second and third electrode portions A, B and C are connected to the movable contact of the auxiliary relay. The same symbols are used and the symbols Fa, F
b was attached. Now that the configuration of the present invention has been described, the operation of the apparatus of the present invention will be described with reference to FIGS. 1, 2 and 3. There is no abnormality on the water surface, the float 1 floats on the water surface while maintaining a balanced state, and the pulley 2, its rotating shaft 2a and the slider 5b of the potentiometer 5 rotating with the rotating shaft 2a are normal. If so, the float 1 moves upward and downward while maintaining a balanced state according to the rise and fall of the water level. The upward / downward movement of the float 1 is transmitted to a pulley 2 via a wire 3, and together with the pulley 2, its rotary shaft 2a and a slider 5b of a potentiometer 5
Is rotated counterclockwise and clockwise, and lead wires 6 and 6a
A water level voltage signal corresponding to the water level is transmitted via. As described above, when the float type water level transmitter is operating normally without any abnormality, the auxiliary relay F (float 1) is in the inoperative state, and the normally closed contact Fb
(Between electrodes A and B) is closed and normally open contact Fa (electrodes A and C)
Is open. Accordingly, since the open / close state of the contacts Fb and Fa in the expanded connection diagram of the abnormality detection circuit device shown in FIG. 2 is as shown, the auxiliary relay X operates and the normally closed contact Xb opens. The auxiliary relay Y is not operated, and its normally open contact Ya is open. Therefore, the time limit relay T does not operate and the normally open time limit contact Ta does not close, so that no alarm command signal is issued. On the other hand, if the pulley 2 cannot rotate due to driftwood floating on the water surface, falling leaves in the fall, freezing of the water surface in the winter, or dust, etc., the movement of the float 1 will be maintained even if the water surface level drops. It cannot follow the falling water level. Therefore, the float 1 floats up and is suspended by the wire 3, and the electrode B that has been in contact with the water surface is separated from the water surface, so that the electrode B and the electrode A are in a non-conductive state. That is, the auxiliary relay F
(Float 1) is in the operating state and its normally closed contact Fb
(Between electrodes A and B) is opened. That is, in the expanded connection diagram, the normally closed contact Fb is opened, the auxiliary relay X is inoperative, and the normally closed contact Xb is closed, so that the timed relay T operates.
Therefore, the normally open time limit contact Ta is closed after a predetermined time, and issues an alarm command signal to an alarm device (not shown) to give an alarm. On the other hand, when the water level rises and the pulley 2 cannot rotate due to dust or the like, the float 1 rises with the rise of the water level.
Sagging occurs. For this reason, the float 1 which is manufactured by itself being out of balance is inclined as shown in FIG. 3, the electrode B in contact with the water surface is separated from the water surface, and the electrode C which was on the water surface is submerged below the water surface. become. Therefore, the electrode B and the electrode A are in a non-conductive state, and the electrode A and the electrode C are in a conductive state. That is, the auxiliary relay F (float 1) is activated, and its normally closed contact Fb (electrode A
(Between B) and the normally open contact Fa (between the electrodes A and C) is closed. That is, in the expanded connection diagram, the open / close state of the normally closed contact Fb and the normally open contact Fa is opposite to that shown in the figure, so that the auxiliary relay X is inoperative and the normally closed contact Xb is closed. Further, the auxiliary relay Y operates, and the normally open contact Ya is also closed. Therefore, the time limit relay T operates and its normally open time limit contact Ta closes after a predetermined time, so that an alarm command signal is issued to an alarm device (not shown) to give an alarm. In this way, in the present invention, it is possible to detect an abnormality of the float type water level transmitting device regardless of when the water level rises or falls. As described above, the present invention has been described in detail. According to the present invention, the float of the water level detector itself is unbalanced, and an abnormality occurs in the water level detector or the water surface. Then, the float is configured to be unbalanced, and the unbalance of the float is detected by three electrodes provided on the float. Therefore, when one float type water level transmitter is used, the detected water level data is obtained. It is possible to determine whether the water level is accurate or not, and obtain a float type water level transmitter having an abnormality detection function capable of detecting not only the abnormality of the water level detector but also the abnormal operation of the water level detector caused by the abnormality of the water surface. There are advantages.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram showing one embodiment of the present invention. FIG. 2 is an expanded connection diagram of an abnormality detection circuit device for detecting an abnormality of the device of the present invention. FIG. 3 is an explanatory diagram for explaining the outer shape and abnormal state of the float of the present invention and the operation of the device of the present invention. FIG. 4 is a schematic diagram showing the principle of a conventional float type water level transmission device. [Description of Signs] 1 Float 2 Pulley 2a Pulley rotating shaft 3 Wire 4 Weight 5 Potentiometer 5a Resistor 5b Slider 6 Lead wire 6a Lead wire 8 Abnormality detection circuit device 9 Lead wire

Claims (1)

(57) [Claims] [Claim 1] A float that loses its balance by itself and floats on the water surface, and a weight is suspended at one end,
The middle part has a rotating shaft and is wound around a pulley that rotates integrally with the rotating shaft, and the other end is attached to the float and has a wire that holds the float and floats on the water surface while maintaining balance. Container, and the float is rotated by the rotation shaft that rotates with the rotation of the pulley due to the upward and downward movement of the float in response to the rise and fall of the water surface,
A water level signal converter that outputs a water level signal corresponding to a change in the water level of the water surface, a first electrode attached to the float and constantly submerged under the water surface, and attached to the float, and the float maintains a balance. A second electrode that comes into contact with the surface of the water when floating on the surface of the water and breaks the balance and floats on the surface of the water when floating above the surface of the water, and is attached to the float, and the float holds the balance and is A third electrode that is above the surface of the water when floating on the surface of the water, and that sinks below the surface of the water when floating above the surface of the water when the balance is lost; and a first electrode connected to the first, second, and third electrodes. An abnormality detection circuit device that detects abnormality of the water level detector based on the presence or absence of electrical conduction between the electrode and the second and third electrodes;
A float type water level transmission device having an abnormality detection function, comprising: