LU505547B1 - A simulation device and method for rotor dynamic inter-turn short-circuit fault in generators - Google Patents
A simulation device and method for rotor dynamic inter-turn short-circuit fault in generators Download PDFInfo
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- LU505547B1 LU505547B1 LU505547A LU505547A LU505547B1 LU 505547 B1 LU505547 B1 LU 505547B1 LU 505547 A LU505547 A LU 505547A LU 505547 A LU505547 A LU 505547A LU 505547 B1 LU505547 B1 LU 505547B1
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- 238000004088 simulation Methods 0.000 title description 17
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- 230000005284 excitation Effects 0.000 description 5
- 238000009413 insulation Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
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- 238000011161 development Methods 0.000 description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- Tests Of Circuit Breakers, Generators, And Electric Motors (AREA)
Abstract
The present invention discloses a device and method for simulating the rotor dynamic inter-turn short circuit faults in generators. The device comprises an output terminal of a PWM square wave generator connected to an input terminal of a DC solid-state relay, and an output terminal of the DC solid-state relay connected to a short-circuit tapping plate of the rotor. The method involves changing the frequency of the square wave generated by the PWM square wave generator to generate a corresponding square wave voltage signal, determining the magnitude of the voltage value of the square wave voltage signal and comparing it with a closing threshold value. When the voltage value of the square wave voltage signal is higher than the closing threshold value, an optocoupler controls the closure of the contactless short-circuited circuit, thereby short-circuiting the short-circuit tapping plate connected by the short-circuited circuit.
Description
DECRIPTION LU505547
A SIMULATION DEVICE AND METHOD FOR ROTOR DYNAMIC INTER-TURN
SHORT-CIRCUIT FAULT IN GENERATORS
This invention relates to the technical field of generator simulation devices, more specifically, it pertains to a simulation device and method for the rotor dynamic inter-turn short-circuit fault in generators.
During the acceleration and stable operation of generators, unit vibrations can cause insulation wear in the rotor excitation winding coils, leading to inter-turn short circuits when the worn parts come into contact. In the operation of the generator, the excitation winding may experience increased pressure due to centrifugal force during the rotation of the rotor, leading to close contact and inter-turn short circuits in the winding insulation wear under the action of centrifugal force. As the rotor speed decreases, the pressure from this close contact diminishes, causing the short-circuit state to disappear.
Another scenario is when the rotor experiences changes in rotational frequency or vibration characteristics, resulting in single or periodic inter-turn short circuits at a specific rotational frequency at the site of the winding insulation wear. Both of these cases can be collectively referred to as dynamic inter-turn short-circuit phenomena of the rotor and belong to the development stage of faults. Over prolonged operation, they can develop into stable rotor winding inter-turn short-circuit faults.
Currently, research on inter-turn short circuits in generator rotors primarily focuses on static inter-turn short circuit, with little mention of rotor dynamic inter-turn short circuit.
In reality, the rotor dynamic inter-turn short circuit faults often occur during its operation.
Therefore, considering only the static inter-turn short circuits of the rotor excitation winding is incomplete for the actual operational state of the generator.
In recent years, with the expansion of power plant scale and the increase InJ505547 single-generator capacity, when rotor inter-turn short circuits develop to a certain extent, the decrease in terminal voltage may lead to strong excitation, significantly increasing excitation current and decreasing reactive power. In severe cases, it may cause burns to the shaft neck and bearing, leading to significant shaft magnetization, which can potentially result in grounding faults.
Therefore, the development of a simulation device for the rotor dynamic inter-turn short circuit fault holds significant practical significance for the study of such faults. Thus, providing a simulation device and method for the rotor dynamic inter-turn short circuit fault is an urgent problem that technicians in this field need to address.
In view of this, the present invention provides a simulation device and method for the rotor dynamic inter-turn short-circuit fault. Its purpose is to address the lack of a simulation device for dynamic inter-turn short circuit faults in the existing technology.
To achieve the above objectives, the present invention employs the following technical solution:
A simulation device for the rotor dynamic inter-turn short circuit fault comprising a
PWM square wave generator and a DC solid-state relay.
The output of the PWM square wave generator is connected to the input of the DC solid-state relay, and the output of the DC solid-state relay is connected to the rotor short-circuit tap of the generator.
The DC solid-state relay includes a voltage sensing circuit, an optocoupler, and a short-circuited circuit.
The voltage sensing circuit, the optocoupler, and the short-circuited circuit are connected in series, and the output of the PWM square wave generator is electrically connected to the input of the voltage sensing circuit. The output of the voltage sensing circuit is connected to the input of the optocoupler, and the rotor short-circuit tap is connected to the short-circuited circuit.
Optionally, it further includes a DC power supply to provide a DC voltage to theJ505547
PWM square wave generator.
Optionally, it further includes a 220V AC power supply to power the DC power supply.
A simulation method for the dynamic inter-turn short-circuit fault of a generator rotor, comprises the following steps:
S1. Change the frequency of the square wave generated by the PWM square wave generator.
S2. Adjust the duty cycle of the short-circuit portion based on the simulated dynamic short-circuit condition of the unit.
S3. Generate a corresponding square wave voltage signal based on the frequency and input it into the DC solid-state relay. Determine the voltage value of the square wave voltage signal and compare it with a closing threshold.
S4. When the voltage value of the square wave voltage signal is higher than the closing threshold, the optocoupler controls the short-circuited circuit to close without contact, shorting the rotor short-circuit tap connected to the short-circuited circuit. When the voltage value of the square wave voltage signal is lower than the closing threshold, the connected rotor short-circuit tap remains in its normal state.
Optionally, the DC power supply provides a DC voltage to the PWM square wave generator.
Optionally, a 220V AC power supply powers the DC power supply.
In summary, compared to existing technology, the present invention discloses a simulation device and method for the dynamic inter-turn short-circuit fault of a generator rotor. This device, through its method, can simulate the rotor dynamic inter-turn short circuit faults with different frequencies and different short-circuited duty cycles. It has advantages such as a wide range of frequencies that can be simulated and contactless control. This invention can fill the existing gaps and shortcomings in the field of simulation experiments for dynamic inter-turn short-circuit faults in generator rotors and lay the foundation for future research.
BRIEF DESCRIPTION OF THE FIGURES LU505547
In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the provided drawings without exerting creative efforts.
Figure 1 is a schematic diagram of the rotor turns of the generator rotor dynamic inter-turn short circuit fault simulation device provided by the present invention,
Figure 2 is a schematic structural diagram of the generator rotor dynamic inter-turn short circuit fault simulation device provided by the present invention,
Figure 3 is a schematic diagram of the principle of the generator rotor dynamic inter-turn short circuit fault simulation device provided by the present invention.
The following is a description of the technical solution in the embodiments of the present invention, in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.
Embodiments of the present invention disclose a rotor dynamic inter-turn short circuit fault simulation device for generators, comprising: a PWM square wave generator and a
DC solid-state relay; the output terminal of the PWM square wave generator is connected to the input terminal of the DC solid-state relay, and the output terminal of the DC solid-state relay is connected to the rotor short circuit tapping plate of the generator, the
DC solid-state relay comprises a voltage judging circuit, an optocoupler, and a short-circuited circuit, the voltage judging circuit, the optocoupler and the short-circuited circuit are electrically connected in sequence, the output terminal of the PWM square wave generator is electrically connected to the input terminal of the voltage judgirg/505547 circuit, the output terminal of the voltage judging circuit is electrically connected to the input terminal of the optocoupler, and the rotor short-circuit tapping plate is connected to the short-circuited circuit.
To further implement the above technical solution, it also includes a DC power supply, which provides DC voltage to the PWM square wave generator. To further implement the above technical solution, it also includes a 220V AC power supply, which powers the DC power supply.
A method for simulating a rotor dynamic inter-turn short-circuit fault of generators, comprises the following steps:
S1. Change the frequency of the square wave emitted by the PWM square wave generator, S2. Adjust the duty cycle of the short-circuit part according to the dynamic short-circuit situation simulated by the unit, S3. Generate a corresponding square wave voltage signal according to the frequency and input it into the DC solid-state relay, and judge the voltage value of the square wave voltage signal with the closed threshold, S4.
When the voltage value of the square wave voltage signal is higher than the closed threshold, the optocoupler controls the short-circuited circuit to close without contact, causing the rotor short-circuit tapping plate connected by the short-circuited circuit to short-circuit, when the voltage value of the square wave voltage signal is lower than the closed threshold, the connected rotor short-circuit tapping plate is a normal pile body.
To further implement the above technical solution, the DC power supply provides DC voltage to the PWM square wave generator. To further implement the above technical solution, the 220V AC power supply powers the DC power supply.
Further explanations in conjunction with the drawings are as follows:
As shown in Figure 1, under normal circumstances, the rotor coil is fixed in the rotor core through coil straps, and the coil has an insulating layer on the outside and maintains a certain inter-turn distance d1. When the generator starts to operate, the rotor will slowly climb to the working speed from rest, during which vibration or centrifugal force will cause wear on the insulation between the coils.
When the wear reaches a certain degree, a short circuit occurs between the coils(505547 and with the increase of the rotor speed or vibration, the inter-turn short-circuit phenomenon disappears, and the above process is repeated to form the rotor dynamic inter-turn short circuit.
As shown in Figure 2, first, connect the LO and L4 of the generator short-circuit tapping plate to the output terminal of the DC solid-state relay, and connect the control terminal of the DC solid-state relay to the square wave output terminal of PWM3. Then connect the power terminal of the PWM square wave generator to the 24V port of the DC power supply and use a 220V AC power supply to power the DC power supply. After the wiring is completed, you can turn on the switch on the PWM square wave generator. By holding and rotating the knob, you can adjust the frequency of the generated square wave and directly rotate to adjust the duty cycle of the short-circuit part. Wait for the digital display screen of the PWM square wave generator to stop flashing, then you can turn on the generator for dynamic short-circuit fault simulation.
The working principle is shown in Figure 3. By setting the frequency of the PVVM square wave generator and the duty cycle of the short-circuit part, the square wave voltage output by the PWM square wave generator is as shown in Figure 3, and input to the DC solid-state relay through a diode combination circuit to block the -1V voltage signal, retain the 1V voltage signal, and control the internal circuit closure of the relay without contact through the optocoupler, so that the two generator taps LO and L4 are short-circuited. Repeat this process to simulate dynamic short circuits with different frequencies and different duty cycles of the short-circuit part.
The present invention can simulate dynamic inter-turn short-circuit faults of generator rotors with different frequencies and different short-circuit duty cycles. It has the advantages of a wide range of simulated frequencies and contactless control, which can fill the gaps and deficiencies in the current experimental devices and methods for simulating dynamic inter-turn short-circuit faults of generator rotors, laying a foundation for subsequent research, and is worthy of promotion.
The embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the parts that are the same or similar between each embodiment can be referred to each other.
For the disclosed devices in the embodiments, the description is relatively simpl&J505547 because they correspond to the disclosed methods in the embodiments. Relevant parts can be referred to the description in the method section.
The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be practiced in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. A device for simulating the rotor dynamic inter-turn short circuit faults in generators, characterized by comprising a PWM square wave generator and a DC solid-state relay; the output terminal of the PWM square wave generator is connected to the input terminal of the DC solid-state relay, and the output terminal of the DC solid-state relay is connected to the rotor short-circuit tapping plate of the generator; the DC solid-state relay includes a voltage judging circuit, an optocoupler, and a short-circuited circuit; the voltage judging circuit, the optocoupler, and the short-circuited circuit are electrically connected in sequence; the output terminal of the PWM square wave generator is electrically connected to the input terminal of the voltage judging circuit, the output terminal of the voltage judging circuit is electrically connected to the input terminal of the optocoupler, and the rotor short-circuit tapping plate is connected to the short-circuited circuit.
2. The device for simulating the rotor dynamic inter-turn short circuit faults in generators according to claim 1, further comprising a DC power supply, wherein the DC power supply provides DC voltage to the PWM square wave generator.
3. The device for simulating the rotor dynamic inter-turn short circuit faults in generator according to claim 1, further comprising a 220V AC power supply for supplying power to the DC power supply.
4. A method for simulating the dynamic inter-turn short circuit faults in generators, based on the device for simulating the rotor dynamic inter-turn short circuit faults in generators according to claim 1, comprises the following steps:
S1. changing the frequency of the square wave emitted by the PWM square wave generator,
S2. adjusting the duty cycle of the short-circuit portion according to the dynamic short-circuit situation of the simulated unit,
S3. generating a corresponding square wave voltage signal according to the frequendy505547 and inputting it into the DC solid-state relay, and determining the magnitude of the voltage value of the square wave voltage signal and the closing threshold value,
S4. when the voltage value of the square wave voltage signal is higher than the closing threshold value, the optocoupler controls the contactless closure of the short-circuited circuit, causing the short-circuit tapping plate connected by the short-circuited circuit to short-circuit, when the voltage value of the square wave voltage signal is lower than the closing threshold value, the connected rotor short-circuit tapping plate is a normal structure.
5. The method for simulating the rotor dynamic inter-turn short circuit faults of in generators according to claim 4, wherein the DC power supply provides DC voltage to the PWM square wave generator.
6. The method for simulating the rotor dynamic inter-turn short circuit faults in generators according to claim 4, wherein a 220V AC power supply supplies power to the DC power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU505547A LU505547B1 (en) | 2023-11-16 | 2023-11-16 | A simulation device and method for rotor dynamic inter-turn short-circuit fault in generators |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU505547A LU505547B1 (en) | 2023-11-16 | 2023-11-16 | A simulation device and method for rotor dynamic inter-turn short-circuit fault in generators |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| LU505547B1 true LU505547B1 (en) | 2024-05-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| LU505547A LU505547B1 (en) | 2023-11-16 | 2023-11-16 | A simulation device and method for rotor dynamic inter-turn short-circuit fault in generators |
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| Country | Link |
|---|---|
| LU (1) | LU505547B1 (en) |
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2023
- 2023-11-16 LU LU505547A patent/LU505547B1/en active IP Right Grant
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Effective date: 20240516 |