Hydro-generator magnet yoke heating control system

Abstract

The utility model provides a hydro-generator magnet yoke heating control system, and belongs to the technical field of heating control. Comprising a temperature acquisition module, a control module, a temperature regulation module, an execution module and a heating module, the output end of the temperature acquisition module is connected with the input end of the control module; the output end of the control module is connected with the input end of the temperature adjusting module; the output end of the temperature adjusting module is connected with the input end of the execution module; and the output end of the execution module is connected with the input end of the heating module. According to the set and detected temperature, the PLC controls the bidirectional silicon controlled rectifier, adjusts the power of the hydro-generator magnet yoke heating module and continuously adjusts the power of the heating module in a stepless manner, so that the actual temperature of the heating module always changes along with the set temperature, and the set temperature is kept consistent with the actual temperature; the technical problems that in the prior art, low-frequency interference and flicker phenomena are prone to occurring, the response speed is low, and the control precision is low are solved.

Description

Technical Field

[0001] The present application relates to a hydro-generator yoke heating control system, belonging to the technical field of heating control. Background Art

[0002] Traditionally, the yoke of a hydro-turbine generator is heated using an AC contactor. The heating element is a track-type heating plate, applied to the yoke surface on one side. Insulation is provided by a glass wool blanket, which wraps the entire yoke. Overheating of the AC contactor during prolonged operation can affect its proper function and even damage it. Furthermore, prolonged heating can cause the yoke to overheat. Therefore, to control heating, a thyristor (SCR) zero-crossing triggering method is employed. Zero-crossing triggering monitors the zero point of the AC voltage waveform and sends a trigger signal at these specific points to turn the SCR on or off near zero. This method has the advantage of reducing impact and interference on the power grid. Because the voltage is almost zero and the current is just beginning, the on / off action does not significantly impact the grid. Compared to non-zero-crossing triggering, zero-crossing triggering generates less electromagnetic interference and poses less damage to equipment.

[0003] However, since zero-crossing triggering is an intermittent working mode, it is prone to low-frequency interference and flickering in situations with continuous current. This flicker not only affects the normal operation of the equipment, but may also cause visual fatigue to the operator; zero-crossing triggering adjusts the output power by changing the conduction frequency. This method has a certain delay and is not as fast as phase-shift triggering in responding to load changes; in situations where load power needs to be adjusted quickly, the control accuracy and response speed of zero-crossing triggering may not meet the requirements. Utility Model Content

[0004] The following is a brief overview of the present invention to provide a basic understanding of certain aspects of the present invention. It should be understood that this overview is not an exhaustive overview of the present invention. It is not intended to identify key or important aspects of the present invention, nor is it intended to limit the scope of the present invention. Its purpose is simply to present certain concepts in a simplified form as a prelude to the more detailed description discussed later.

[0005] In view of this, in order to solve the technical problems existing in the prior art of prone to low-frequency interference and flickering, slow response speed and low control accuracy, the utility model provides a hydro-generator yoke heating control system.

[0006] A hydro-generator yoke heating control system includes a temperature acquisition module, a control module, a temperature adjustment module, an execution module and a heating module;

[0007] The output end of the temperature acquisition module is connected to the input end of the control module; the output end of the control module is connected to the input end of the temperature adjustment module; the output end of the temperature adjustment module is connected to the input end of the execution module; and the output end of the execution module is connected to the input end of the heating module.

[0008] Preferably, the temperature acquisition module is a temperature controller for acquiring the temperature of the hydro-generator yoke.

[0009] Preferably, the control module is a PLC, which is used to determine whether the current temperature of the hydro-generator yoke exceeds a threshold.

[0010] Preferably, the temperature adjustment module is a temperature controller, which is used to control the on and off of the execution module.

[0011] Preferably, the execution module is a bidirectional thyristor, which is used to adjust the power of the hydro-generator yoke heating module.

[0012] The beneficial effects of the present invention are as follows: the present invention controls the bidirectional thyristor by PLC according to the set and detected temperature, adjusts the power of the hydro-generator yoke heating module, and continuously and steplessly adjusts the power of the heating module so that its actual temperature always follows the set temperature change and keeps the set temperature consistent with the actual temperature, solving the technical problems in the prior art of prone to low-frequency interference and flickering, slow response speed and low control accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0014] Figure 1 The figure is a schematic diagram of the structure of a hydro-generator yoke heating control system. DETAILED DESCRIPTION

[0015] In order to make the technical solutions and advantages of the embodiments of the present application more clearly understood, the exemplary embodiments of the present application are further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, and are not an exhaustive list of all the embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other unless they conflict.

[0016] Example 1, reference Figure 1 To illustrate this embodiment, a hydro-generator yoke heating control system includes a temperature acquisition module, a control module, a temperature adjustment module, an execution module and a heating module;

[0017] The output end of the temperature acquisition module is connected to the input end of the control module; the output end of the control module is connected to the input end of the temperature adjustment module; the output end of the temperature adjustment module is connected to the input end of the execution module; and the output end of the execution module is connected to the input end of the heating module.

[0018] The heating module is a stainless steel mica heating plate with high-temperature mica insulation. The heating plate is a flat heating material that maximizes the heat transfer surface with the heated object. High-temperature mica heating offers excellent conductivity, produces no open flame, and minimizes heat loss. The product heats up and dissipates heat quickly, does not glow red, is easy to use, heats up quickly, has high thermal efficiency, consumes little power, and has a long service life. It is reliable, heats up well, and is heat-resistant up to 600°C.

[0019] Stainless steel mica heating sheets are placed in the gaps between the stacked sheets. The total heating power is about 1700KW. There are 144 sheets per layer, 9 layers in total, and a total of 1026 sheets. The rated voltage of a single heating sheet is 220V. A layer of crawler-type heating plates is added at the bottom of the yoke. Each sheet has a power of 4KW and a specification of 800*400. There are about 45 sheets per week, totaling 180KW. The inside and outside of the yoke are covered with fireproof and high-temperature resistant insulation cloth to prevent heat loss.

[0020] Temperature detection points are set at the heating points of the hydro-generator yoke. Each detection point is equipped with a temperature acquisition module to collect the real-time temperature at the temperature detection point. The temperature acquisition module has an alarm function and issues an alarm when the set temperature is exceeded.

[0021] The temperature acquisition module is a temperature controller, which is used to acquire the temperature of the hydro-generator yoke.

[0022] The control module is a PLC, which is used to determine whether the current temperature of the hydro-generator yoke exceeds a threshold.

[0023] The temperature threshold is set manually. The control module receives the real-time temperature transmitted by the temperature acquisition module and compares it with the set temperature threshold.

[0024] The temperature adjustment module is a temperature controller used to control the on and off of the execution module.

[0025] The execution module is a bidirectional thyristor, which is used to adjust the power of the hydro-generator yoke heating module.

[0026] The principle of the utility model is as follows: a stainless steel mica heating sheet is placed in the gap between the stacked sheets of the hydro-generator yoke that needs to be heated; a temperature acquisition module acquires the real-time temperature of each temperature detection point and transmits the acquired temperature to a control module; the control module compares the real-time acquired temperature with the set temperature; when the real-time temperature is greater than the set temperature, a control signal is output to the temperature adjustment module to control the disconnection of the bidirectional thyristor and the heating module to stop heating; when the real-time temperature is less than the set temperature, a control signal is output to the temperature adjustment module to control the connection of the bidirectional thyristor and the heating module to start heating;

[0027] Although the present invention has been described in terms of a limited number of embodiments, it will be apparent to those skilled in the art, having benefit of the foregoing description, that other embodiments are contemplated within the scope of the invention thus described. Furthermore, it should be noted that the language used in this specification has been selected primarily for readability and didactic purposes, rather than for the purpose of explaining or limiting the subject matter of the invention. Consequently, many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the appended claims. The disclosure of the invention is illustrative and not restrictive of the scope of the invention, which is defined by the appended claims.

Claims

1. A hydro-generator yoke heating control system, characterized in that: It includes temperature acquisition module, control module, temperature adjustment module, execution module and heating module; The output end of the temperature acquisition module is connected to the input end of the control module; the output end of the control module is connected to the input end of the temperature adjustment module; the output end of the temperature adjustment module is connected to the input end of the execution module; the output end of the execution module is connected to the input end of the heating module; The heating module is a stainless steel mica heating sheet, which uses high-temperature mica insulation. The heating sheet is a flat heating material that forms a maximum heat conduction surface with the heated object; Stainless steel mica heating sheets are placed in the gaps between the stacked sheets. The total heating power is about 1700KW. There are 144 sheets in each layer, 9 layers in total, and 1026 sheets in total. The rated voltage of a single heating sheet is 220V. A layer of crawler-type heating plate is added at the bottom of the yoke. Each sheet has a power of 4KW, 800*400 specifications, about 45 sheets in a week, and a total of 180KW. There is fireproof and high-temperature resistant insulation cloth inside and outside the yoke to prevent heat loss.

2. A hydro-generator yoke heating control system according to claim 1, characterized in that: The temperature acquisition module is a temperature controller, which is used to acquire the temperature of the hydro-generator yoke.

3. A hydro-generator yoke heating control system according to claim 2, characterized in that: The control module is a PLC, which is used to determine whether the current temperature of the hydro-generator yoke exceeds a threshold.

4. A hydro-generator yoke heating control system according to claim 3, characterized in that: The temperature adjustment module is a temperature controller used to control the on and off of the execution module.

5. A hydro-generator yoke heating control system according to claim 4, characterized in that: The execution module is a bidirectional thyristor, which is used to adjust the power of the hydro-generator yoke heating module.

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