CN111948455A - 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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- CN111948455A CN111948455A CN202010630641.0A CN202010630641A CN111948455A CN 111948455 A CN111948455 A CN 111948455A CN 202010630641 A CN202010630641 A CN 202010630641A CN 111948455 A CN111948455 A CN 111948455A
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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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- 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 the insulation resistance of a stator winding and a water conduit of a 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 end. The second circuit breaker is electrically connected between the shielding point of the penstock and the shielding end. The third circuit breaker is electrically connected between the shielding 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 application provides an insulation resistance detection device of generator easy operation is convenient, 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 in power plant electrical systems, primarily for converting mechanical energy into electrical energy. With the development of power units to high capacity and high parameter, the safe and stable operation of each generator has more and more influence on the stability of the power grid and the power quality of the power grid. In order to ensure a continuously reliable operation of the generator set, it must be periodically checked for insulation, wherein the detection of the insulation of the stator winding is of great importance. When the insulation resistance detection is carried out on the stator winding of the water-cooled generator, the insulation water conduit of the stator winding needs to be shielded and wired, 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 errors are easy to occur.
Disclosure of Invention
In view of the above, it is necessary to provide an insulation resistance detection apparatus and method for a generator, and a generator.
In one aspect, an embodiment of the present application provides an insulation resistance detection apparatus for a generator, for detecting an insulation resistance of a stator winding of the generator and an 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 end;
a second circuit breaker electrically connected between a shielding point of the water conduit and the shielding end;
a third circuit breaker electrically connected between a shielding 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, is used for controlling the closing and the opening of the first circuit breaker, the second circuit breaker and the third circuit breaker and controlling the work of the insulation resistance detector.
In one embodiment, the method further comprises the following steps:
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 the following steps:
and the fifth circuit breaker is electrically connected between the grounding end and the shielding point of the water conduit and is in signal connection with the controller.
In one embodiment, the number of the water conduits is multiple, 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 water conduit comprises one or more of a water inlet annular water pipe, a water outlet annular water pipe, a U-phase inlet pipe, a V-phase inlet pipe, a W-phase inlet pipe and a neutral point water conduit.
In one embodiment, the method further comprises the following steps:
the casing has been seted up and has been held the chamber, insulation resistance detector first circuit breaker the second circuit breaker with the third circuit breaker sets up hold the chamber.
In one embodiment, the method further comprises the following steps:
and 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, including:
the insulation resistance detection device of the generator;
a stator winding electrically connected to the first circuit breaker;
and the shielding point of the water conduit is electrically connected with the second circuit breaker and the third circuit breaker.
In another aspect, an embodiment of the present application further provides a method for detecting insulation resistance by using the insulation resistance detecting apparatus of a generator, including:
controlling, by the controller, the third circuit breaker to close;
the controller controls the insulation resistance detector to detect the ground insulation resistance 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;
and the controller controls the insulation resistance detector to detect the insulation resistance to the ground of the stator winding.
In one embodiment, the detecting, by the insulation resistance detector, insulation resistance to ground of the stator winding includes:
adjusting the voltage value of the insulation resistance detector to a preset voltage value through the controller;
and the controller controls the insulation resistance detector to detect the insulation resistance to the 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 and a fifth circuit breaker, the fourth circuit breaker is in signal connection with the controller, the ground terminal is grounded through the fourth circuit breaker, the fifth circuit breaker is electrically connected between the ground terminal and the shielding point of the water conduit and is in signal connection with the controller, and the method further includes:
controlling the fifth circuit breaker to be closed and controlling the fourth circuit breaker and the second circuit breaker to be opened through the controller;
the controller controls the insulation resistance detector to detect the insulation resistance of the water conduit relative to the stator winding.
In one embodiment, the method further comprises the following steps:
and the controller controls the second circuit breaker, the third circuit breaker and the fourth circuit breaker to be closed so as to discharge 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 a stator winding of the generator and the insulation resistance of a 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 end. The second circuit breaker is electrically connected between the shielding point of the penstock and the shielding end. The third circuit breaker is electrically connected between the shielding point of the penstock and the line end. The insulation resistance detection device of generator that this embodiment provided will first circuit breaker second circuit breaker with the third circuit breaker is installed in required position, through controller control first circuit breaker second circuit breaker with the closing and the disconnection of third circuit breaker. When the insulation resistance detector is used for detection, wiring does not need to be changed frequently, and only the first circuit breaker, the second circuit breaker and the third circuit breaker need to be controlled to work, so that the detection is very simple and convenient. Moreover, the controller is used for automatic control, so that errors are not easy to occur, and the detection accuracy can be improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the description of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a generator insulation resistance detection apparatus 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 structural 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 structural diagram of a generator according to an embodiment of the present application;
FIG. 6 is a flow chart illustrating steps of a generator insulation resistance detection method according to an embodiment of the present disclosure;
FIG. 7 is a flow chart illustrating steps of a generator insulation resistance detection method according to an embodiment of the present disclosure;
fig. 8 is a schematic step flow chart of a generator insulation resistance detection method according to an embodiment of the present application.
Description of reference numerals:
10. an 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 end;
120. a ground terminal;
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. an accommodating chamber;
920. a display screen.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and that modifications may be made by one skilled in the art without departing from the spirit and scope of the application and it is therefore not intended to be limited to the specific embodiments disclosed below.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings). In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present application and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be considered as limiting the present application.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
The following describes the technical solutions of the present application and how to solve the technical problems with the technical solutions of the present application in detail with specific embodiments. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments. Embodiments of the present application will be described below with reference to the accompanying drawings.
The utility model provides an insulation resistance detection device of generator is used for detecting the insulation resistance of generator, and the generator includes stator winding and leading water pipe, leading water pipe and stator winding mechanical connection. When the stator winding works, cold water is input into the water conduit to cool the stator winding, so that heat generated when the stator winding works can be reduced. The insulation resistance detection device of 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 the insulation resistance of a stator winding and a water conduit in the water-cooled generator.
Referring to fig. 1, an embodiment of the present application provides an insulation resistance detection apparatus 10 for a generator, which 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 end 110, a ground end 120, and a shielding end 130, where the ground end 120 is grounded. The insulation resistance tester 100 provides voltage to the stator winding 21 or the water conduit 22 through the line end 110. The insulation resistance detector 100 is grounded through the ground terminal 120, so as 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 detecting the insulation resistance of the stator winding 21, the line end 110 is connected to the stator winding 21, the shielding end 130 is connected to the shielding point of the water conduit 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 conduit 22. The present embodiment does not limit the specific structure and type of the insulation resistance detector 100, as long as the function thereof can be achieved. In one embodiment, the insulation resistance tester 100 is a megohmmeter, which includes a hand-operated generator, a voting device, and three terminals (L: line terminal, E: ground terminal, G: shield terminal). The insulation resistance is conveniently and reliably detected by using the megger.
The first circuit breaker 200 is electrically connected between the stator winding 21 and the line side 110. The second circuit breaker 300 is electrically connected between the shield point of the penstock 22 and the shield end 130. The third circuit breaker 400 is electrically connected between the shielded 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 work of the insulation resistance detector 100. The controller 500 may be a microprocessor, a chip, a PLC (programmable logic controller), and the like.
Circuit breakers are used to detect the closing and breaking of load circuits. The circuit breaker may be classified into a high voltage circuit breaker and a low voltage circuit breaker according to the range of use. The first circuit breaker 200, the second circuit breaker 300, and the third circuit breaker 400 may be the same or different in type, and this embodiment is not limited to this, 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 closing and opening of the first circuit breaker 200. The controller 500 controls the closing and opening of the second circuit breaker 300 to make and break the line between the shielding point of the penstock 22 and the shielding end 130. The controller 500 can complete the connection and disconnection of the line between the shielding point of the penstock 22 and the line end 110 by closing and opening the third circuit breaker 400. The controller 500 controls the third circuit breaker 400 to close and controls the insulation resistance detector 100 to start detecting the insulation resistance, so that the insulation resistance of the water conduit 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, so that the insulation resistance of the stator winding 21 can be obtained. The shield point of the penstock 22 may be a shield port that a worker places anywhere on the penstock 22. The present embodiment does not limit the position of the shielding point of the penstock 22, the material used, etc., as long as the function thereof can be achieved. The circuit breaker has overload, short circuit and undervoltage protection function, use the circuit breaker can to the circuit with insulation resistance detector 100 protects, improves the security of the insulation resistance detection device 10 of generator.
The working principle of the insulation resistance detection device 10 of the generator is as follows:
the first circuit breaker 200, the second circuit breaker 300, the third circuit breaker 400, the line end 110, the shield end 130, the stator winding 21 and the penstock 22 are connected according to the connection method 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 the detection, so that the insulation resistance of the water conduit 22 is obtained. The controller 500 controls the third circuit breaker 400 to be opened, the first circuit breaker 200 and the second circuit breaker 300 are closed, the insulation resistance detector 100 starts to detect, and the obtained insulation resistance is the insulation resistance of the stator winding 21.
The insulation resistance detection device of the generator provided by the 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 control that passes through that this embodiment provides first circuit breaker 200 second circuit breaker 300 with the closing and the disconnection of third circuit breaker 400 use like this when insulation resistance detector 100 detects, do not need frequent change wiring, only need control first circuit breaker 200 second circuit breaker 300 with third circuit breaker 400 work can, 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 an embodiment, the insulation resistance detecting 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 ground terminal 120 can be grounded and ungrounded by controlling the closing and opening of the fourth circuit breaker 600 by the controller 500. For the description of the fourth circuit breaker 600, reference may be made to the description of the first circuit breaker 200, the second circuit breaker 300, and the third circuit breaker 400 in the above embodiments, and details are not repeated herein. In this embodiment, the fourth circuit breaker 600 is disposed on the ground terminal 120, and the ground terminal 120 can be flexibly grounded and ungrounded by closing and opening the fourth circuit breaker 600, so that the practicability 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 shielding point of the penstock 22, and is in signal connection with the controller 500. The controller 500 is used to control the closing and opening of the fifth circuit breaker 700. The controller 500 controls the fifth circuit breaker 700 to be closed and opened, so that the ground terminal 120 can be connected to and disconnected from the shielding point of the penstock 22. In this embodiment, 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, 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 opened state. By using the insulation pack inspection apparatus 100, the insulation resistance of the water conduit 22 relative to the stator winding 21 can be detected. The fifth circuit breaker 700 increases the function of the insulation resistance detection device 10 of the generator, and improves the practicability of the insulation resistance detection device 10 of the generator.
Referring to fig. 3, in one embodiment, the number of the water conduit 22 is multiple, and the insulation resistance detection apparatus 10 of the generator further includes a plurality of branch breakers 800, one branch breaker is connected between one water conduit and the second breaker 300, and each branch breaker 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, which is not repeated herein.
With continued reference to FIG. 3, in one embodiment, the penstock 22 includes one or more of a water inlet surround, a water outlet surround, a U-phase intake, a V-phase intake, a W-phase intake, and a neutral penstock. And, the quantity of each water inlet annular water pipe, water outlet annular water pipe, U-phase inlet pipe, V-phase inlet pipe, W-phase inlet pipe and neutral point water conduit can be a plurality.
In a specific embodiment, if the water conduit 22 includes an inlet water ring, an outlet water ring and a U-phase inlet pipe, the insulation resistance detection 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 circulating pipe and the second circuit breaker 300, and also between the water inlet circulating pipe and the third circuit breaker 400. The circuit breaker 2 is connected between the water outlet circular water pipe and the second circuit breaker 300, and also between the water outlet circular 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 closing and the opening of the circuit breaker 1, the circuit breaker 2 and the circuit breaker 3.
Through the controller 500 guarantees 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, utilize the insulation resistance detector 100 begins to detect insulation resistance, and the insulation resistance that obtains is the water inlet ring water pipe. Through the controller 500 guarantees 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, utilize the insulation resistance detector 100 begins to detect insulation resistance, and the insulation resistance that obtains for the water outlet ring water pipe. Through controller 500 guarantees circuit breaker 3 the third circuit breaker 400 with fourth circuit breaker 600 is in the closure state, and other circuit breakers are in the off-state, utilize insulation resistance detector 100 begins to detect insulation resistance, and what obtain is the insulation resistance of U looks inlet tube. Through controller 500 guarantees circuit breaker 1, circuit breaker 2, circuit breaker 3 third circuit breaker 400 with fourth circuit breaker 600 is in the on-state, and other circuit breakers are in the off-state, utilize insulation resistance detector 100 begins to detect insulation resistance, and what obtain is the total insulation resistance of inlet water ring water pipe, outlet water ring water pipe and U phase inlet tube. In this embodiment, the insulation resistance of each water conduit can be obtained by the control of the controller 500 and the detection of the insulation resistance detector 100, so that the function of the insulation resistance detection device 10 of the generator is increased, and the practicability of the insulation resistance detection device 10 of the generator is improved.
With continued reference to fig. 3, in one embodiment, the insulation resistance detecting device 10 of the generator further includes a housing 900. The housing 900 is provided with an accommodating 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 accommodating cavity 910. The housing 900 may be a square structure, or may be a rectangular parallelepiped or other irregular structure. The material of the housing 900 may be stainless steel wrapped with an insulating layer, or may be plastic. The size of the accommodating chamber 910 is not limited in this embodiment. The size of the accommodating chamber 910 may be determined according to the size of the device disposed inside the accommodating chamber 910. The present embodiment does not set any limitation on the shape, size, structure, material, etc. of the housing 900 as long as the function thereof can be achieved. In this embodiment, the insulation resistance tester 100, the first circuit breaker 200, the second circuit breaker 300, and the third circuit breaker 400 are integrated into a single unit using the housing 900, which is convenient for operation and installation. In addition, the housing 900 can protect the devices disposed therein from being affected by the external environment and causing damage thereto, and thus, the practicability of the insulation resistance detection apparatus 10 of the generator can be improved.
Referring to fig. 4, in an embodiment, the insulation resistance detecting apparatus 10 of the generator further includes a display screen 920. The display screen 920 is disposed on the housing 900 and is in signal connection with the controller 500. The display screen 920 is a display tool for displaying a certain electronic file on the screen through a specific transmission device and reflecting the electronic file to human eyes. Display panels may be classified into cathode ray tube display panels, plasma display panels, and liquid crystal display panels according to the manufacturing materials. The present embodiment does not limit the type, size, and the like of the display 920, as long as the functions thereof can be realized. The controller 500 may 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 screen 920 may display the detected resistance value of the insulation resistor of the water conduit 22, the detected resistance value of the insulation resistor of the stator winding 21, the detected voltage value of the insulation resistor detector 100, and the like. In the detection process, the display 920 may display which device has the insulation resistance detected at this time. In a specific embodiment, the display 920 is a touch-enabled display, and the staff member can control the detection process through the display 920. In this embodiment, the staff can clearly obtain the insulation resistance of the device under test through the display screen 920, and the working voltage and other parameters of the insulation resistance detector 100, so that the practicability of the insulation resistance detection apparatus 10 of the generator is improved.
Referring to fig. 5, an embodiment of the present application provides a generator 20 including the insulation resistance detection device 10 of the generator, a stator winding 21 and a water conduit 22 as provided in the above embodiments. 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 component in a generator, and the stator winding 21 can be divided into a centralized type and a distributed type according to different winding shapes and different embedding wiring modes of coils. The water conduit 22 is mechanically connected to the stator winding 21. The water conduit 22 is used for guiding cold water, and reduces heat generated by the stator winding 21 when the water conduit works. Since the generator 20 includes the insulation resistance detection device 10 of the generator, all the structures and advantageous effects of the insulation resistance detection device 10 of the generator will not be described herein.
Referring to fig. 6, an embodiment of the present application provides a method for performing insulation resistance detection by using the insulation resistance detection apparatus 10 of a generator provided in the above embodiment, including:
s100, controlling the third circuit breaker 400 to close through the controller 500.
S200, the controller controls the insulation resistance detector 100 to detect the insulation resistance to the ground of the water conduit 22.
S300, the controller 500 controls the third circuit breaker 400 to open and controls the first circuit breaker 200 and the second circuit breaker 300 to close.
And S400, controlling the insulation resistance detector 100 to detect the insulation resistance to the ground of the stator winding 21 by the controller.
Before the test is started, 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 shielding point of the water conduit 22 and the shielding terminal 130, the third circuit breaker 400 is connected between the shielding point of the water conduit 22 and the shielding terminal 130, and the ground terminal 120 is grounded. When the detection is started, the controller 500 controls the third circuit breaker 400 to be closed, that is, the controller 500 ensures that the third circuit breaker 400 is in a closed state and the other circuit breakers are in an open state. The controller 500 controls the insulation resistance detector 100 to start detecting, so that the insulation resistance to ground of the water conduit 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 are closed, that is, the controller 500 ensures that the first circuit breaker 200 and the second circuit breaker 300 are in a closed state, and other circuit breakers are in an open state. The controller 500 controls the insulation resistance detector 100 to start detecting, so that the insulation resistance to ground of the stator winding 21 can be obtained.
In one embodiment, the controller 500 determines whether the insulation resistance of the penstock 22 and the insulation resistance of the stator windings 21 are detected. The controller 500 determines whether the insulation resistance of the water conduit 22 is greater than or equal to a first preset threshold, where the first preset threshold is a standard insulation resistance of the water conduit 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 greater than or equal to a second preset threshold, specifically, the second preset threshold is 60 megaohms. The worker sets different standard insulation resistances for different water diversion pipes 22, and the embodiment does not limit the insulation resistances. In this embodiment, the insulation resistance of the water conduit 22 and the insulation resistance of the stator winding 21 are detected, so that whether the insulation resistance of the water conduit 22 and the insulation resistance of the stator winding 21 meet the standard or not can be determined, and if the insulation resistance does not meet the standard, a worker can timely maintain the generator 20, so that the practicability of the generator is improved.
Since the method is a method for detecting the insulation resistance by using the insulation resistance detection device 10 of the generator, the method has all the structures and beneficial effects of the insulation resistance detection device 10 of the generator, and details are not repeated herein.
Referring to fig. 7, in an embodiment, the detecting the insulation resistance to ground of the stator winding 21 by the insulation resistance detector 100 in step S400 includes:
s410, the controller 500 adjusts 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 for detecting the insulation resistances of different devices, the controller 500 may adjust the voltage value of the insulation resistance detector 100. When detecting the comparative insulation resistance of the stator winding 21, the controller 500 is first utilized to adjust the voltage value of the insulation resistance detector 100 to the preset voltage value, and then the insulation resistance detector 100 is controlled to start detecting the insulation resistance. In a specific embodiment, when the insulation resistance of the water conduit 22 is detected, the voltage value of the insulation resistance detector 100 is 500V; 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 water conduit 22 is finished, 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 be in line with the detection object. This can improve the degree of accuracy that insulation resistance detection appearance 100 detected to use control 500 to adjust voltage, forget when can avoiding the staff to operate and adjust voltage, can improve the practicality of the insulation resistance detection device 10 of generator.
Referring to fig. 8, in an embodiment, the insulation resistance detecting apparatus 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, the ground terminal 120 is grounded through the fourth circuit breaker 600, the fifth circuit breaker 700 is electrically connected between the ground terminal 120 and the shielding point of the water conduit 22 and is in signal connection with the controller 500, and the method further includes:
and S500, controlling the fifth breaker 700 to be closed and controlling the fourth breaker 600 and the second breaker 300 to be opened through the controller 500.
S600, the controller 500 controls the insulation resistance detector 100 to detect the insulation resistance of the water conduit 22 relative to the stator winding 21.
Before the detection, the fourth circuit breaker 600 and the fifth circuit breaker 700 are connected in the above-described connection manner. When the detection is started, the controller 500 controls the fifth circuit breaker 700 to be closed, the fourth circuit breaker 600 and the second circuit breaker 300 are opened, that is, the controller 500 ensures that the first circuit breaker 200 and the fifth circuit breaker 700 are in the closed state, and other circuit breakers are in the open state. At this time, the controller 500 controls the insulation resistance detector 100 to start detection, so that the insulation resistance of the water conduit 22 relative to the stator winding 21 can be obtained. In this embodiment, the insulation resistance of the water conduit 22 relative to the stator winding 21 can be detected by the insulation resistance detection device 10 of the generator, so that the function of the insulation resistance detection device 10 of the generator is increased, and the practicability of the insulation resistance detection device 10 of the generator is improved.
With continued reference to fig. 8, in an embodiment, the method for detecting insulation resistance of a generator further includes:
s700, the controller 500 controls the second breaker 300, the third breaker 400 and the fourth breaker 600 to close, so as to discharge the insulation resistance detection apparatus 10 of the generator.
In this embodiment, after the insulation resistance detection of the water conduit 22 and the stator winding 21 is finished, 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 the practicability of the insulation resistance detection device 10 of the generator can be improved.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (12)
1. An insulation resistance detection device of a generator, for detecting an insulation resistance of a stator winding of the generator and an 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;
a first circuit breaker electrically connected between the stator winding and the line end;
a second circuit breaker electrically connected between a shielding point of the water conduit and the shielding end;
a third circuit breaker electrically connected between a shielding 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, is used for controlling the closing and the opening of the first circuit breaker, the second circuit breaker and the third circuit breaker and controlling the work of the insulation resistance detector.
2. The insulation resistance detecting device 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 detecting device 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 conduit and is in signal connection with the controller.
4. The insulation resistance detecting device of a generator according to claim 1, wherein the number of the water conduit is plural, the insulation resistance detecting device of a 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.
5. The insulation resistance detecting device of the generator as claimed in claim 1, wherein the water conduit comprises one or more of a water inlet circular water pipe, a water outlet circular water pipe, a U-phase water inlet pipe, a V-phase water inlet pipe, a W-phase water inlet pipe and a neutral point water conduit.
6. The insulation resistance detecting device of a generator according to claim 1, further comprising:
the casing has been seted up and has been held the chamber, insulation resistance detector first circuit breaker the second circuit breaker with the third circuit breaker sets up hold the chamber.
7. The insulation resistance detecting device of a generator according to claim 6, further comprising:
and the display screen is arranged on the shell and is in signal connection with the controller.
8. An electrical generator, comprising:
the insulation resistance detection device of the generator according to any one of claims 1 to 7;
a stator winding electrically connected to the first circuit breaker;
and the shielding point of the water conduit is electrically connected with the second circuit breaker and the third circuit breaker.
9. A method of performing insulation resistance detection using the insulation resistance detection device of a generator according to any one of claims 1 to 7, comprising:
controlling, by the controller, the third circuit breaker to close;
the controller controls the insulation resistance detector to detect the ground insulation resistance 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;
and the controller controls the insulation resistance detector to detect the insulation resistance to the ground of the stator winding.
10. The method of claim 7, wherein the detecting the insulation resistance to ground of the stator winding using the insulation resistance detector comprises:
adjusting the voltage value of the insulation resistance detector to a preset voltage value through the controller;
and the controller controls the insulation resistance detector to detect the insulation resistance to the ground of the stator winding under the condition of the preset voltage value.
11. The method of claim 7, wherein the insulation resistance detection device of the generator comprises a fourth circuit breaker and a fifth circuit breaker, the fourth circuit breaker is in signal connection with the controller, the ground terminal is grounded through the fourth circuit breaker, the fifth circuit breaker is electrically connected between the ground terminal and the shielding point of the water conduit and is in signal connection with the controller, and the method further comprises:
controlling the fifth circuit breaker to be closed and controlling the fourth circuit breaker and the second circuit breaker to be opened through the controller;
the controller controls the insulation resistance detector to detect the insulation resistance of the water conduit relative to the stator winding.
12. The method of claim 11, further comprising:
and the controller controls the second circuit breaker, the third circuit breaker and the fourth circuit breaker to be closed so as to discharge 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 (en) | 2023-11-14 |
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