CN111948455B - Insulation resistance detection device and method of generator and generator - Google Patents
Insulation resistance detection device and method of generator and generator Download PDFInfo
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- CN111948455B CN111948455B CN202010630641.0A CN202010630641A CN111948455B CN 111948455 B CN111948455 B CN 111948455B CN 202010630641 A CN202010630641 A CN 202010630641A CN 111948455 B CN111948455 B CN 111948455B
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- 238000009413 insulation Methods 0.000 title claims abstract description 247
- 238000001514 detection method Methods 0.000 title claims abstract description 83
- 238000000034 method Methods 0.000 title claims abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 86
- 238000004804 winding Methods 0.000 claims abstract description 67
- 238000012216 screening Methods 0.000 claims abstract description 5
- 230000007935 neutral effect Effects 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
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- 238000011161 development Methods 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 229910001220 stainless steel Inorganic materials 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/20—Modifications of basic electric elements for use in electric measuring instruments; Structural combinations of such elements with such instruments
- G01R1/206—Switches for connection of measuring instruments or electric motors to measuring loads
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Tests Of Circuit Breakers, Generators, And Electric Motors (AREA)
Abstract
The application relates to an insulation resistance detection device and method of a generator and the generator. The generator insulation resistance detection device is used for detecting insulation resistances of a stator winding and a water guide pipe of the generator. The device comprises an insulation resistance detector, a first circuit breaker, a second circuit breaker, a third circuit breaker and a controller. The insulation resistance detector comprises a line end, a grounding end and a shielding end. The first circuit breaker is electrically connected between the stator winding and the line terminal. The second circuit breaker is electrically connected between the shield point of the penstock and the shield end. The third circuit breaker is electrically connected between the screening point of the penstock and the line end. The controller is in signal connection with the first circuit breaker, the second circuit breaker, the third circuit breaker and the insulation resistance detector. The insulation resistance detection device of the generator is simple and convenient to operate and has higher accuracy.
Description
Technical Field
The application relates to the technical field of electrical equipment detection, in particular to an insulation resistance detection device and method of a generator and the generator.
Background
Generators are important devices of the electrical system of a power plant, mainly for converting mechanical energy into electrical energy. With the development of the electric power unit to high capacity and high parameters, the influence of safe and stable operation of each generator on the stability of the power grid and the power quality of the power grid is greater. In order to ensure a continuous reliable operation of the generator set, it is necessary to periodically perform insulation detection, wherein the detection of the insulation of the stator windings is very important. When the insulation resistance of the stator winding of the water-cooled generator is detected, shielding wiring is needed to be conducted on the insulation water conduit of the stator winding, the insulation resistance of the insulation water conduit is removed, and finally the insulation resistance of the stator winding is obtained.
In the conventional technology, when the insulation resistance of the stator winding is detected, the shielding wiring needs to be frequently changed, the operation is troublesome, and the error is easy.
Disclosure of Invention
In view of the foregoing, it is desirable to provide an insulation resistance detection device and method for a generator, and a generator.
In one aspect, an embodiment of the present application provides an insulation resistance detection apparatus of a generator for detecting insulation resistance of a stator winding of the generator and insulation resistance of a water conduit, including:
the insulation resistance detector comprises a line end, a grounding end and a shielding end, wherein the grounding end is grounded;
a first circuit breaker electrically connected between the stator winding and the line terminal;
a second circuit breaker electrically connected between the shield point of the penstock and the shield end;
a third circuit breaker electrically connected between the screening point of the penstock and the line end;
and the controller is in signal connection with the first circuit breaker, the second circuit breaker, the third circuit breaker and the insulation resistance detector and is used for controlling the closing and opening of the first circuit breaker, the second circuit breaker and the third circuit breaker and controlling the operation of the insulation resistance detector.
In one embodiment, the method further comprises:
and the fourth circuit breaker is in signal connection with the controller, and the grounding end is grounded through the fourth circuit breaker.
In one embodiment, the method further comprises:
and the fifth circuit breaker is electrically connected between the grounding end and the shielding point of the water diversion pipe and is in signal connection with the controller.
In one embodiment, the number of the water conduits is a plurality, and the insulation resistance detection device of the generator further comprises a plurality of branch breakers, one branch breaker is connected between one water conduit and the second breaker, and each branch breaker is in signal connection with the controller.
In one embodiment, the penstock comprises one or more of a water inlet annulus pipe, a water outlet annulus pipe, a U-phase water inlet pipe, a V-phase water inlet pipe, a W-phase water inlet pipe, and a neutral point penstock.
In one embodiment, the method further comprises:
the shell is provided with a containing cavity, and the insulation resistance detector, the first circuit breaker, the second circuit breaker and the third circuit breaker are arranged in the containing cavity.
In one embodiment, the method further comprises:
the display screen is arranged on the shell and is in signal connection with the controller.
In another aspect, an embodiment of the present application provides a generator, comprising:
the insulation resistance detection device of the generator;
a stator winding electrically connected with the first circuit breaker;
and the shielding point of the water diversion pipe is electrically connected with the second circuit breaker and the third circuit breaker.
In still another aspect, an embodiment of the present application further provides a method for detecting insulation resistance using the insulation resistance detecting device of a generator as described above, including:
controlling the third circuit breaker to be closed by the controller;
the controller controls the insulation resistance detector to detect the insulation resistance to ground of the water conduit;
the controller controls the third circuit breaker to be opened and controls the first circuit breaker and the second circuit breaker to be closed;
the controller controls the insulation resistance detector to detect the insulation resistance to ground of the stator winding.
In one embodiment, the detecting the insulation resistance to ground of the stator winding by using the insulation resistance detector includes:
the voltage value of the insulation resistance detector is adjusted to a preset voltage value through the controller;
the controller controls the insulation resistance detector to detect the insulation resistance to ground of the stator winding under the condition of the preset voltage value.
In one embodiment, the insulation resistance detection device of the generator includes a fourth circuit breaker in signal connection with the controller and the ground terminal is grounded through the fourth circuit breaker, and a fifth circuit breaker electrically connected between the ground terminal and the shield point of the penstock and in signal connection with the controller, the method further comprising:
controlling the fifth circuit breaker to be closed through the controller, and controlling the fourth circuit breaker and the second circuit breaker to be opened;
the controller controls the insulation resistance detector to detect insulation resistance of the penstock relative to the stator winding.
In one embodiment, the method further comprises:
and controlling the second circuit breaker, the third circuit breaker and the fourth circuit breaker to be closed through the controller so as to realize discharging of the insulation resistance detection device of the generator.
The embodiment of the application provides an insulation resistance detection device and method of a generator and the generator. The insulation resistance detection device of the generator is used for detecting the insulation resistance of the stator winding of the generator and the insulation resistance of the water conduit. The device comprises an insulation resistance detector, a first circuit breaker, a second circuit breaker, a third circuit breaker and a controller. The insulation resistance detector comprises a line end, a grounding end and a shielding end. The first circuit breaker is electrically connected between the stator winding and the line terminal. The second circuit breaker is electrically connected between the shield point of the penstock and the shield end. The third circuit breaker is electrically connected between the screening point of the penstock and the line end. According to the insulation resistance detection device of the generator, the first circuit breaker, the second circuit breaker and the third circuit breaker are installed at the required positions, and the first circuit breaker, the second circuit breaker and the third circuit breaker are controlled to be closed and opened through the controller. When the insulation resistance detector is used for detection, the wiring does not need to be changed frequently, and only the first circuit breaker, the second circuit breaker and the third circuit breaker are controlled to work, so that the insulation resistance detector is very simple and convenient. Moreover, the controller is used for automatic control, errors are not easy to occur, and the detection accuracy can be improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments or the conventional techniques of the present application, the drawings required for the descriptions of the embodiments or the conventional techniques will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to the drawings without inventive effort for different persons skilled in the art.
Fig. 1 is a schematic structural diagram of a generator insulation resistance detection device according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a generator insulation resistance detection device according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a generator insulation resistance detection device according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a generator insulation resistance detection device according to an embodiment of the present application;
FIG. 5 is a schematic diagram of a generator according to an embodiment of the present application;
FIG. 6 is a schematic flow chart of steps of a method for detecting insulation resistance of a generator according to an embodiment of the present application;
FIG. 7 is a schematic flow chart of steps of a method for detecting insulation resistance of a generator according to an embodiment of the present application;
fig. 8 is a flowchart illustrating steps of a method for detecting insulation resistance of a generator according to an embodiment of the present application.
Reference numerals illustrate:
10. insulation resistance detection device of the generator;
20. a generator;
21. a stator winding;
22. a water conduit;
100. an insulation resistance detector;
110. a line terminal;
120. a grounding end;
130. a shielding end;
200. a first circuit breaker;
300. a second circuit breaker;
400. a third circuit breaker;
500. a controller;
600. a fourth circuit breaker;
700. a fifth circuit breaker;
800. a plurality of branch breakers;
900. a housing;
910. a receiving chamber;
920. and a display screen.
Detailed Description
In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the application, whereby the application is not limited to the specific embodiments disclosed below.
The numbering of the components itself, e.g. "first", "second", etc., is used herein merely to distinguish between the described objects and does not have any sequential or technical meaning. The term "coupled" as used herein includes both direct and indirect coupling (coupling), unless otherwise indicated. In the description of the present application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element in question must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.
In the present application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
The following describes the technical scheme of the present application and how the technical scheme of the present application solves the technical problems in detail with specific embodiments. The following embodiments may be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments. Embodiments of the present application will be described below with reference to the accompanying drawings.
The insulation resistance detection device of the generator is used for detecting the insulation resistance of the generator, the generator comprises a stator winding and a water conduit, and the water conduit is mechanically connected with the stator winding. When the stator winding works, cold water is input into the water guide pipe so as to cool the stator winding, and heat generated when the stator winding works can be reduced. The insulation resistance detection device using the generator can detect the insulation resistance of the stator winding and the insulation resistance of the water conduit. Specifically, the insulation resistance detection device of the generator can detect insulation resistances of the stator winding and the water conduit in the water-cooled generator.
Referring to fig. 1, an insulation resistance detecting apparatus 10 of a generator according to an embodiment of the present application includes an insulation resistance detector 100, a first circuit breaker 200, a second circuit breaker 300, a third circuit breaker 400, and a controller 500.
The insulation resistance detector 100 includes a line terminal 110, a ground terminal 120, and a shield terminal 130, the ground terminal 120 being grounded. The insulation resistance detector 100 provides a voltage to the stator winding 21 or the penstock 22 through the line end 110. The insulation resistance detector 100 is grounded through the grounding terminal 120 to ensure the safety of the insulation resistance detector 100. The device connected to the shielding terminal 130 may remove the insulation resistance of the device when the insulation resistance detector 100 detects the insulation resistance. Specifically, when the insulation resistance of the stator winding 21 is detected, the line terminal 110 is connected to the stator winding 21, the shield terminal 130 is connected to the shield point of the water pipe 22, and the insulation resistance of the stator winding 21 detected by the insulation resistance detector 100 is removed from the insulation resistance of the water pipe 22. The specific structure and kind of the insulation resistance detector 100 are not limited in this embodiment, as long as the function thereof can be realized. In one specific embodiment, the insulation resistance detector 100 is a megohmmeter, also known as a megaohm meter, comprising a hand generator, a vote, and three terminals (L: line side, E: ground side, G: shield side). The use of the megger to detect the insulation resistance is convenient and reliable.
The first circuit breaker 200 is electrically connected between the stator winding 21 and the line terminal 110. The second circuit breaker 300 is electrically connected between the shielded point of the penstock 22 and the shielded end 130. The third circuit breaker 400 is electrically connected between the screening point of the penstock 22 and the line end 110.
The controller 500 is in signal connection with the first circuit breaker 200, the second circuit breaker 300, the third circuit breaker 400 and the insulation resistance detector 100, and is used for controlling the closing and opening of the first circuit breaker 200, the second circuit breaker 300 and the third circuit breaker 400 and controlling the operation of the insulation resistance detector 100. The controller 500 may be a microprocessor, a chip, a PLC (programmable logic controller), or the like.
The circuit breaker is used to detect switching on and off of the load circuit. Circuit breakers can be classified into high voltage circuit breakers and low voltage circuit breakers according to the range of use. The types of the first circuit breaker 200, the second circuit breaker 300, and the third circuit breaker 400 may be the same or different, and the present embodiment is not limited in any way as long as the functions thereof can be realized. The controller 500 may perform the connection and disconnection of the line between the stator winding 21 and the line terminal 110 by controlling the connection and disconnection of the first circuit breaker 200. The controller 500 can achieve the connection and disconnection of the line between the shielding point of the penstock 22 and the shielding end 130 by controlling the closing and opening of the second circuit breaker 300. The controller 500 can perform the connection and disconnection of the line between the shielding point of the penstock 22 and the line end 110 by the closing and opening of the third circuit breaker 400. The controller 500 controls the third circuit breaker 400 to be closed and controls the insulation resistance detector 100 to start detecting insulation resistance, and thus the insulation resistance of the penstock 22 can be obtained. The controller 500 controls the third circuit breaker 400 to be opened, the first circuit breaker 200 and the second circuit breaker 300 to be closed, and controls the insulation resistance detector 100 to start detecting insulation resistance, and thus insulation resistance of the stator winding 21 can be obtained. The shielded point of the penstock 22 may be a shielded port provided by a worker anywhere on the penstock 22. The present embodiment does not impose any limitation on the position of the shielding point of the water conduit 22, the material to be provided, and the like, as long as the function thereof can be achieved. The circuit breaker has overload, short-circuit and undervoltage protection functions, and the circuit and the insulation resistance detector 100 can be protected by using the circuit breaker, so that the safety of the insulation resistance detection device 10 of the generator is improved.
The insulation resistance detection device 10 of the generator works as follows:
first, the first circuit breaker 200, the second circuit breaker 300, the third circuit breaker 400, the line terminal 110, the shield terminal 130, the stator winding 21, and the water conduit 22 are connected in the connection manner in the above embodiment. When connected, the first circuit breaker 200, the second circuit breaker 300, and the third circuit breaker 400 are all in an open state. When the detection is started, the controller 500 controls the third circuit breaker 400 to be closed, and controls the insulation resistance detector 100 to start detecting, and the insulation resistance of the water conduit 22 is obtained. The controller 500 controls the third circuit breaker 400 to open, the first circuit breaker 200 and the second circuit breaker 300 to close, and the insulation resistance detector 100 starts to detect, and the insulation resistance of the stator winding 21 is obtained.
The insulation resistance detection device of the generator provided in this embodiment includes an insulation resistance detector 100, a first circuit breaker 200, a second circuit breaker 300, a third circuit breaker 400, and a controller 500. The insulation resistance detector 100 includes a line terminal 110, a ground terminal 120, and a shield terminal 130. The controller 500 provided in this embodiment controls the first circuit breaker 200, the second circuit breaker 300, and the third circuit breaker 400 to be turned on or off, so that when the insulation resistance detector 100 is used for detecting, frequent wire changing is not required, and only the first circuit breaker 200, the second circuit breaker 300, and the third circuit breaker 400 are required to be controlled to work, which is very simple and convenient. Moreover, the controller 500 is used for automatic control, so that errors are not easy to occur, and the detection accuracy can be improved.
Referring to fig. 2, in one embodiment, the insulation resistance detection apparatus 10 of the generator further includes a fourth circuit breaker 600. The fourth circuit breaker 600 is in signal connection with the controller 500, and the ground terminal 120 is grounded through the fourth circuit breaker 600. The controller 500 is used to control the closing and opening of the fourth circuit breaker 600. The grounding terminal 120 can be grounded or ungrounded by controlling the closing and opening of the fourth circuit breaker 600 by the controller 500. The description of the fourth circuit breaker 600 may refer to the descriptions of the first circuit breaker 200, the second circuit breaker 300, and the third circuit breaker 400 in the above embodiments, and will not be repeated here. In this embodiment, by providing the fourth circuit breaker 600 at the ground terminal 120, the ground terminal 120 can be flexibly grounded and ungrounded by closing and opening the fourth circuit breaker 600, and the practicality of the insulation resistance detection apparatus 10 of the generator can be improved.
With continued reference to fig. 2, in one embodiment, the insulation resistance detection apparatus 10 of the generator further includes a fifth circuit breaker 700. The fifth circuit breaker 700 is electrically connected between the ground terminal 120 and the shielded point of the penstock 22 and is in signal communication with the controller 500. The controller 500 is used to control the closing and opening of the fifth circuit breaker 700. The connection and disconnection of the line between the ground terminal 120 and the shield point of the penstock 22 can be accomplished by the controller 500 controlling the closing and opening of the fifth circuit breaker 700. In the present embodiment, the fifth circuit breaker 700 is controlled to be closed by the controller 500, and the fourth circuit breaker 600 and the second circuit breaker 300 are opened, that is, at this time, the first circuit breaker 200 and the fifth circuit breaker 700 are in a closed state, and the fourth circuit breaker 600, the second circuit breaker 300 and the third circuit breaker 400 are in an open state. By detecting with the insulation electric group detector 100, the insulation resistance of the water conduit 22 with respect to the stator winding 21 can be detected. The arrangement of the fifth circuit breaker 700 increases the function of the insulation resistance detection apparatus 10 of the generator, and improves the practicality of the insulation resistance detection apparatus 10 of the generator.
Referring to fig. 3, in one embodiment, the number of the water conduits 22 is plural, and the insulation resistance detecting device 10 of the generator further includes a plurality of branch breakers 800, one of which is connected between one of the water conduits and the second breaker 300, each of which is in signal connection with the controller 500. The controller 500 is used to control the closing and opening of each of the branch breakers. The number of branch breakers is the same as the number of penstocks 22. For the description of the branch circuit breaker, reference may be made to the above description of the first circuit breaker 200, the second circuit breaker 300 and the third circuit breaker 400, and the description thereof will not be repeated here.
With continued reference to FIG. 3, in one embodiment, the penstock 22 includes one or more of a water inlet annulus pipe, a water outlet annulus pipe, a U-phase inlet pipe, a V-phase inlet pipe, a W-phase inlet pipe, and a neutral point penstock. And the number of each water inlet annular water pipe, each water outlet annular water pipe, each U-phase water inlet pipe, each V-phase water inlet pipe, each W-phase water inlet pipe and each neutral point water diversion pipe can be multiple.
In a specific embodiment, if the water conduit 22 includes one water inlet ring pipe, one water outlet ring pipe and one U-phase water inlet pipe, the insulation resistance detecting device 10 of the generator includes a circuit breaker 1, a circuit breaker 2 and a circuit breaker 3. The circuit breaker 1 is connected between the water inlet pipe and the second circuit breaker 300, and also connected between the water inlet pipe and the third circuit breaker 400. The circuit breaker 2 is connected between the outlet water pipe and the second circuit breaker 300, and also connected between the outlet water pipe and the third circuit breaker 400. The circuit breaker 3 is connected between the U-phase water inlet pipe and the second circuit breaker 300, and also between the U-phase water inlet pipe and the third circuit breaker 400. The controller 500 is in signal connection with the circuit breaker 1, the circuit breaker 2 and the circuit breaker 3, and the controller 500 is used for controlling the circuit breaker 1, the circuit breaker 2 and the circuit breaker 3 to be closed and opened.
The controller 500 ensures that the circuit breaker 1, the third circuit breaker 400 and the fourth circuit breaker 600 are in a closed state, and other circuit breakers are in an open state, and the insulation resistance detector 100 starts to detect insulation resistance, so that the insulation resistance of the water inlet ring water pipe is obtained. The controller 500 ensures that the circuit breaker 2, the third circuit breaker 400 and the fourth circuit breaker 600 are in a closed state, and other circuit breakers are in an open state, and the insulation resistance detector 100 starts to detect insulation resistance, so that the insulation resistance is obtained as the insulation resistance of the water outlet circulating pipe. The controller 500 ensures that the circuit breaker 3, the third circuit breaker 400 and the fourth circuit breaker 600 are in a closed state, and other circuit breakers are in an open state, and the insulation resistance detector 100 starts to detect insulation resistance, so that the insulation resistance of the U-phase water inlet pipe is obtained. The controller 500 ensures that the circuit breaker 1, the circuit breaker 2, the circuit breaker 3, the third circuit breaker 400 and the fourth circuit breaker 600 are in a closed state, and other circuit breakers are in an open state, and the insulation resistance detector 100 starts to detect insulation resistance, so that the total insulation resistance of the water inlet ring water pipe, the water outlet ring water pipe and the U-phase water inlet pipe is obtained. In this embodiment, the insulation resistance of each water conduit can be obtained by the control of the controller 500 and the insulation resistance detector 100, which increases the function of the insulation resistance detection device 10 of the generator and improves the practicality of the insulation resistance detection device 10 of the generator.
With continued reference to fig. 3, in one embodiment, the insulation resistance detection apparatus 10 of the generator further includes a housing 900. The housing 900 is provided with a receiving cavity 910, and the insulation resistance detector 100, the first circuit breaker 200, the second circuit breaker 300, and the third circuit breaker 400 are provided with the receiving cavity 910. The housing 900 may have a square structure, a rectangular parallelepiped structure, or other irregularly shaped structures. The material of the housing 900 may be stainless steel wrapped with an insulating layer or plastic. The size of the receiving chamber 910 is not limited in this embodiment. The size of the receiving chamber 910 may be determined according to the size of the device disposed inside the receiving chamber 910. The shape, size, structure, material, etc. of the housing 900 are not limited in this embodiment, as long as the functions thereof can be achieved. In the present embodiment, the insulation resistance detector 100, the first circuit breaker 200, the second circuit breaker 300, and the third circuit breaker 400 are integrated using the housing 900, thereby facilitating the operation and the setting. In addition, the housing 900 can protect the devices disposed therein from the external environment, and can improve the practicality of the insulation resistance detection device 10 of the generator.
Referring to fig. 4, in one embodiment, the insulation resistance detection device 10 of the generator further includes a display screen 920. The display 920 is disposed in the housing 900 and is in signal connection with the controller 500. The display 920 is a display means for displaying a certain electronic document on a screen through a specific transmission device and then reflecting the electronic document to human eyes. The display panel may be classified into a cathode ray tube display panel, a plasma display panel, and a liquid crystal display panel according to manufacturing materials. The type, size, etc. of the display screen 920 are not limited in this embodiment, as long as the functions thereof can be realized. The controller 500 can obtain the insulation resistance of the water conduit 22 and the insulation resistance of the stator winding 21 through the insulation resistance detector 100. The display 920 may display the detected resistance value of the insulation resistance of the water conduit 22, the resistance value of the insulation resistance of the stator winding 21, the voltage value of the insulation resistance detector 100 at the time of detection, and the like. In addition, during the detection process, the display screen 920 may display the insulation resistance of which device is detected at this time. In a specific embodiment, the display 920 is a touchable display, and the operator can control the detection process through the display 920. In this embodiment, the operator can clearly obtain the insulation resistance of the tested device and the working voltage of the insulation resistance detector 100 through the display screen 920, so as to improve the practicability of the insulation resistance detection device 10 of the generator.
Referring to fig. 5, an embodiment of the present application provides a generator 20 including the insulation resistance detection device 10, the stator winding 21, and the water conduit 22 of the generator provided in the above embodiment. The stator winding 21 is electrically connected to the first circuit breaker 200. The shield point of the penstock 22 is electrically connected to the second circuit breaker 300 and the third circuit breaker 400. The stator winding 21 is a device in the generator, and the stator winding 21 can be divided into two types, i.e., centralized type and distributed type, according to the winding shape of the coil and the embedded wiring mode. The water conduit 22 is mechanically connected to the stator winding 21. The water conduit 22 is used for guiding cold water, and reduces the heat generated by the stator winding 21 during operation. Since the generator 20 includes the insulation resistance detecting device 10 of the generator, all the structures and advantageous effects of the insulation resistance detecting device 10 of the generator are not described herein.
Referring to fig. 6, an embodiment of the present application provides a method for detecting insulation resistance by using the insulation resistance detecting device 10 of the generator provided in the above embodiment, including:
and S100, controlling the third circuit breaker 400 to be closed through the controller 500.
S200, the controller controls the insulation resistance detector 100 to detect the insulation resistance to ground of the penstock 22.
S300, the controller 500 controls the third circuit breaker 400 to be opened, and controls the first circuit breaker 200 and the second circuit breaker 300 to be closed.
S400, the controller controls the insulation resistance detector 100 to detect the insulation resistance to ground of the stator winding 21.
Before starting the test, the first circuit breaker 200 is connected between the stator winding 21 and the line terminal 110, the second circuit breaker 300 is connected between the shield point of the water conduit 22 and the shield terminal 130, the third circuit breaker 400 is connected between the shield point of the water conduit 22 and the shield terminal 130, and the ground terminal 120 is grounded. At the start of detection, the third circuit breaker 400 is controlled to be closed by the controller 500, that is, the third circuit breaker 400 is ensured to be in a closed state by the controller 500, and other circuit breakers are in an open state. The controller 500 controls the insulation resistance detector 100 to start detection, and thus obtains the insulation resistance to ground of the water conduit 22. The third circuit breaker 400 is controlled to be opened by the controller 500, and the first circuit breaker 200 and the second circuit breaker 300 are closed, that is, the first circuit breaker 200 and the second circuit breaker 300 are ensured to be in a closed state by the controller 500, and other circuit breakers are in an open state. The controller 500 controls the insulation resistance detector 100 to start detection, and thus obtains the insulation resistance to ground of the stator winding 21.
In a specific embodiment, the controller 500 determines that the insulation resistance of the penstock 22 and the insulation resistance of the stator winding 21 are detected. The controller 500 determines whether the insulation resistance of the penstock 22 is greater than or equal to a first preset threshold, wherein the first preset threshold is a standard insulation resistance of the penstock 22 set by a worker, and specifically the first preset threshold is 1 megaohm. The controller 500 determines whether the insulation resistance of the stator winding 21 is equal to or greater than a second preset threshold, specifically, 60 megaohms. The operator has different standard insulation resistances provided for different ones of the penstocks 22, which this embodiment is not limited to. In this embodiment, by determining the detected insulation resistance of the water conduit 22 and the insulation resistance of the stator winding 21, it may be determined whether the insulation resistance of the water conduit 22 and the insulation resistance of the stator winding 21 meet the standard, and if not, a worker may perform maintenance in time, thereby improving the practicality of the generator 20.
Since the method is a method of performing insulation resistance detection by using the insulation resistance detection device 10 of the generator, the method has all the structures and advantages of the insulation resistance detection device 10 of the generator, and will not be described herein.
Referring to fig. 7, in one embodiment, the detecting the insulation resistance to ground of the stator winding 21 by using the insulation resistance detector 100 in step S400 includes:
s410, adjusting, by the controller 500, the voltage value of the insulation resistance detector 100 to a preset voltage value.
S420, the controller 500 controls the insulation resistance detector 100 to detect the insulation resistance to ground of the stator winding 21 under the condition of the preset voltage value.
When different test voltages are required to detect the insulation resistances of different devices, the voltage value of the insulation resistance detector 100 can be adjusted by the controller 500. When detecting the comparative insulation resistance of the stator winding 21, the voltage value of the insulation resistance detector 100 is adjusted to the preset voltage value by the controller 500, and then the insulation resistance detector 100 is controlled to start to detect the insulation resistance. In a specific embodiment, the insulation resistance detector 100 has a voltage value of 500V when detecting the insulation resistance of the penstock 22; when detecting the insulation resistance of the stator winding 21, the voltage value of the insulation resistance detector 100 is 2500V. After the insulation resistance detection of the penstock 22 is completed, the voltage value of the insulation resistance detector 100 is adjusted from 500V to 2500V by the controller 500. The insulation resistance detector 100 detects the insulation resistance to ground of the stator winding 21 under the condition that the voltage value is 2500V. In this embodiment, when the detection object of the insulation resistance detector 100 changes, the controller 500 can automatically adjust the voltage value of the insulation resistance detector 100 to match the detection object. This can improve the accuracy of detection by the insulation resistance detector 100, and the voltage is adjusted by the control 500, so that it is possible to prevent a worker from forgetting to adjust the voltage during operation, and to improve the practicality of the insulation resistance detection device 10 of the generator.
Referring to fig. 8, in one embodiment, the insulation resistance detection device 10 of the generator includes a fourth circuit breaker 600 and a fifth circuit breaker 700, the fourth circuit breaker 600 is in signal connection with the controller 500, and the ground terminal 120 is grounded through the fourth circuit breaker 600, and the fifth circuit breaker 700 is electrically connected between the ground terminal 120 and the shielding point of the penstock 22 and in signal connection with the controller 500, the method further includes:
s500, the fifth circuit breaker 700 is controlled to be closed by the controller 500, and the fourth circuit breaker 600 and the second circuit breaker 300 are controlled to be opened.
S600, the controller 500 controls the insulation resistance detector 100 to detect insulation resistance of the penstock 22 with respect to the stator winding 21.
Before the detection, the fourth circuit breaker 600 and the fifth circuit breaker 700 are connected in the above connection manner. At the start of detection, the controller 500 controls the fifth circuit breaker 700 to be closed, and the fourth circuit breaker 600 and the second circuit breaker 300 to be opened, that is, the controller 500 ensures that the first circuit breaker 200 and the fifth circuit breaker 700 are in a closed state and the other circuit breakers are in an open state. At this time, the controller 500 controls the insulation resistance detector 100 to start detection, and thus the insulation resistance of the water pipe 22 with respect to the stator winding 21 can be obtained. In the present embodiment, the insulation resistance of the water conduit 22 with respect to the stator winding 21 can be detected by using the insulation resistance detection device 10 of the generator, which increases the function of the insulation resistance detection device 10 of the generator and improves the practicality of the insulation resistance detection device 10 of the generator.
With continued reference to fig. 8, in one embodiment, the method for detecting insulation resistance of a generator further includes:
s700 of controlling the second circuit breaker 300, the third circuit breaker 400 and the fourth circuit breaker 600 to be closed by the controller 500 to realize the discharge of the insulation resistance detecting device 10 of the generator.
In this embodiment, after the insulation resistance detection of the water conduit 22 and the stator winding 21 is completed, the controller 500 ensures that all the circuit breakers in the insulation resistance detection device 10 of the generator are in a closed state, so that the insulation resistance detection device 10 of the generator can be discharged, and the safety and practicality of the insulation resistance detection device 10 of the generator can be improved.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples illustrate only a few embodiments of the application and are described in detail herein without thereby limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (12)
1. An insulation resistance detection device of a generator for detecting insulation resistance of a stator winding of the generator and insulation resistance of a water conduit, comprising:
the insulation resistance detector comprises a line end, a grounding end and a shielding end, wherein the grounding end is grounded, and the shielding end is used for removing insulation resistance of a device connected with the shielding end when the insulation resistance detector detects the insulation resistance;
a first circuit breaker electrically connected between the stator winding and the line terminal;
a second circuit breaker electrically connected between the shield point of the penstock and the shield end;
a third circuit breaker electrically connected between the screening point of the penstock and the line end;
the controller is in signal connection with the first circuit breaker, the second circuit breaker, the third circuit breaker and the insulation resistance detector and is used for controlling the first circuit breaker, the second circuit breaker and the third circuit breaker to be closed and opened and controlling the insulation resistance detector to work;
the controller controls the third circuit breaker to be closed, and controls the insulation resistance detector to start detecting insulation resistance so as to determine the insulation resistance of the water conduit; the controller controls the third circuit breaker to be opened, the first circuit breaker and the second circuit breaker to be closed, and controls the insulation resistance detector to start detecting insulation resistance so as to determine insulation resistance of the stator winding.
2. The insulation resistance detection apparatus of a generator according to claim 1, further comprising:
and the fourth circuit breaker is in signal connection with the controller, and the grounding end is grounded through the fourth circuit breaker.
3. The insulation resistance detection apparatus of a generator according to claim 2, further comprising:
and the fifth circuit breaker is electrically connected between the grounding end and the shielding point of the water diversion pipe and is in signal connection with the controller.
4. The insulation resistance detection apparatus of a generator of claim 1, wherein the number of water conduits is plural, the insulation resistance detection apparatus of the generator further comprising a plurality of branch breakers, one of the branch breakers being connected between one of the water conduits and the second breaker, each of the branch breakers being in signal connection with the controller.
5. The insulation resistance detection apparatus of a generator of claim 1, wherein the penstock comprises one or more of a water inlet annulus, a water outlet annulus, a U-phase water inlet pipe, a V-phase water inlet pipe, a W-phase water inlet pipe, and a neutral point penstock.
6. The insulation resistance detection apparatus of a generator according to claim 1, further comprising:
the shell is provided with a containing cavity, and the insulation resistance detector, the first circuit breaker, the second circuit breaker and the third circuit breaker are arranged in the containing cavity.
7. The insulation resistance detection apparatus of a generator according to claim 6, further comprising:
the display screen is arranged on the shell and is in signal connection with the controller.
8. A generator, comprising:
an insulation resistance detection apparatus of a generator according to any one of claims 1 to 7;
a stator winding electrically connected with the first circuit breaker;
and the shielding point of the water diversion pipe is electrically connected with the second circuit breaker and the third circuit breaker.
9. A method of insulation resistance detection using the insulation resistance detection apparatus of the generator according to any one of claims 1 to 7, comprising:
controlling the third circuit breaker to be closed by the controller;
the controller controls the insulation resistance detector to detect the insulation resistance to ground of the water conduit;
the controller controls the third circuit breaker to be opened and controls the first circuit breaker and the second circuit breaker to be closed;
the controller controls the insulation resistance detector to detect the insulation resistance to ground of the stator winding.
10. The method of claim 9, wherein said controlling the insulation resistance detector to detect the insulation resistance to ground of the stator winding comprises:
the voltage value of the insulation resistance detector is adjusted to a preset voltage value through the controller;
the controller controls the insulation resistance detector to detect the insulation resistance to ground of the stator winding under the condition of the preset voltage value.
11. The method of claim 9, wherein the insulation resistance detection device of the generator includes a fourth circuit breaker in signal connection with the controller and through which the ground terminal is grounded, and a fifth circuit breaker electrically connected between the ground terminal and the screen of the penstock and in signal connection with the controller, the method further comprising:
controlling the fifth circuit breaker to be closed through the controller, and controlling the fourth circuit breaker and the second circuit breaker to be opened;
the controller controls the insulation resistance detector to detect insulation resistance of the penstock relative to the stator winding.
12. The method as recited in claim 11, further comprising:
and controlling the second circuit breaker, the third circuit breaker and the fourth circuit breaker to be closed through the controller so as to realize discharging of the insulation resistance detection device of the generator.
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| CN202010630641.0A CN111948455B (en) | 2020-07-03 | 2020-07-03 | Insulation resistance detection device and method of generator and generator |
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| CN202010630641.0A CN111948455B (en) | 2020-07-03 | 2020-07-03 | Insulation resistance detection device and method of generator and generator |
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| CN111948455B true CN111948455B (en) | 2023-11-14 |
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| CN111948455A (en) | 2020-11-17 |
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