CN214375065U - Large-scale generator excitation system open loop low current test device - Google Patents
Large-scale generator excitation system open loop low current test device Download PDFInfo
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- CN214375065U CN214375065U CN202120376515.7U CN202120376515U CN214375065U CN 214375065 U CN214375065 U CN 214375065U CN 202120376515 U CN202120376515 U CN 202120376515U CN 214375065 U CN214375065 U CN 214375065U
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Abstract
The utility model relates to a large-scale generator excitation system open-loop undercurrent test device belongs to power generating equipment and overhauls technical field. The device comprises a maintenance power supply, an isolation transformer, a phase sequence meter, a rectifier bridge, an inductance resistance load, an oscilloscope, a controller, a temperature probe and a cooling fan; the maintenance power supply, the isolation transformer and the rectifier bridge are connected in sequence; the rectifier bridge is connected with the oscilloscope through the resistance-inductance load. The utility model overcomes the defects of the prior art and is provided with a phase sequence meter for judging the phase sequence of the voltage of the low-voltage side of the excitation transformer; a temperature probe for monitoring the temperature of the load and a fan for cooling the load are arranged; the inductance resistance load capable of more truly simulating the rotor winding is arranged; a controller capable of adjusting the rectification trigger pulse is arranged; by analyzing and storing the waveform of the oscilloscope, the operating condition of the excitation system can be more accurately judged, and the test result can be conveniently filed.
Description
Technical Field
The utility model relates to a large-scale generator excitation system open-loop undercurrent test device belongs to power generating equipment and overhauls technical field.
Background
The excitation system of the nuclear reactor type AP1000 adopts a self-shunt excitation mode, a normal working power supply is taken from a turbonator through excitation transformation, an interface is connected with an isolated phase closed bus between a generator and a GCB (generator outlet circuit breaker), after voltage reduction is realized through excitation transformation, rectification is carried out through a rectifier bridge, and a direct-current power supply is provided for a turbonator rotor through a carbon brush and a slip ring. The excitation regulating cabinet controls the silicon controlled conduction angle in the rectifier cabinet to regulate the output excitation voltage of the rectifier cabinet, and then changes the excitation current to realize the regulation of the voltage and the reactive power of the generator terminal.
The definition for the low current test is: the auxiliary power 380V is used as an alternating current input power supply of the excitation system, the output is connected with a small load, the excitation regulator and the power rectifier are electrified, and the excitation output waveform and the size are checked by changing the trigger angle so as to verify the integrity of the excitation system.
In the small current test in the prior art, the phase sequence of the three-phase voltage applied to the alternating-current side busbar of the rectifier cabinet needs to be ensured to be a positive sequence, if the three-phase voltage is not the positive sequence, the de-excitation switch trips, the small current test cannot be continuously executed, but no element for monitoring the voltage phase sequence exists in the conventional test device; the load of the current simulation rotor winding is a pure resistive load, the rotor winding is a resistive load, when a small current test is executed, the heat emitted by the heat energy generated by the load is large, but the current device does not have an element for monitoring the temperature of the load and a facility for cooling the load; when the voltage on two sides of the load is monitored, a voltmeter is used for monitoring the voltage value to judge the rectification effect at present, the detection effect is not as good as the waveform of the monitored voltage, and the rectification effect is more reliable according to the waveform judgment; and the waveform can be directly stored and copied, so that the archiving is convenient.
Therefore, when a nuclear power generating unit is overhauled, particularly after an excitation system is overhauled or modified, in order to check whether the functions of pulse triggering, rectification and the like of the excitation system are normal, the defects need to be overcome, and a simple simulation device is constructed to check the basic control function of the excitation regulator, the reliable pulse triggering capability, the integrity of the thyristor, the output waveform of the thyristor and the like.
Disclosure of Invention
The purpose of the utility model is to solve the defects of the prior art, and to construct a simple device for checking the basic control function of the excitation regulator, the capability of reliable pulse triggering, the integrity of the thyristor, the output waveform of the thyristor and the like.
In order to solve the above problems, the technical solution adopted by the present invention is to provide an open-loop low-current testing device for excitation system of large-scale generator; the device comprises a maintenance power supply, an isolation transformer, a phase sequence meter, a rectifier bridge, an inductance resistance load, an oscilloscope and a controller; the maintenance power supply, the isolation transformer and the rectifier bridge are sequentially connected; the rectifier bridge is connected with the oscilloscope through the inductance resistance load; the rectifier bridge is connected with the controller; a phase sequence meter is arranged between the isolation transformer and the rectifier bridge.
Preferably, a temperature probe and a cooling fan are further arranged in the testing device.
Preferably, the service power supply is provided as an external power supply for supplying a three-phase voltage to the isolation transformer.
Preferably, the rectifier bridge is a three-phase thyristor rectifier bridge.
Preferably, the oscilloscope is a digital oscilloscope.
Compared with the prior art, the utility model discloses following beneficial effect has:
1. by confirming the phase sequence of the alternating-current input voltage of the rectifier bridge, the problem that a small-current test cannot be continuously executed due to tripping of a de-excitation switch is avoided;
2. the cooling fan and the temperature probe are additionally arranged to cool the device, so that the influence of overhigh load temperature on the performance of the device is avoided;
3. the result of the small current test can be judged in time in the test;
4. the trigger pulse is adjusted through the controller, so that direct current output is controlled, the operation is simple and reliable, and the risk of misoperation of equipment is avoided.
Drawings
FIG. 1 is a schematic block diagram of the installation structure of the present invention;
Detailed Description
In order to make the present invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings:
as shown in fig. 1, the utility model provides an open-loop low-current test device for excitation system of large-scale generator; the device comprises a maintenance power supply, an isolation transformer, a phase sequence meter, a rectifier bridge, an inductance resistance load, an oscilloscope and a controller; the maintenance power supply, the isolation transformer and the rectifier bridge are connected in sequence; the rectifier bridge is connected with the oscilloscope through the inductance resistance load; the rectifier bridge is connected with the controller; a phase sequence meter is arranged between the isolation transformer and the rectifier bridge. The testing device is also provided with a temperature probe and a cooling fan. The maintenance power supply is set as an external power supply for providing three-phase voltage for the isolation transformer. The rectifier bridge is set as a three-phase thyristor rectifier bridge. The oscilloscope is a digital oscilloscope.
The utility model discloses the theory of operation of device and implementation:
the utility model can disconnect the excitation variable low voltage side and the excitation system, and disconnect the excitation direct current outlet wire and the generator rotor flexible connection, so that the de-excitation switch is in the open state;
380V alternating current power supply is taken from an overhaul power box of the device and is sent to an excitation alternating current inlet cabinet through an isolation transformer to be used as a power supply for testing; observing and confirming the three-phase voltage to be a positive sequence through a phase sequence meter, and confirming that the cooling fan works normally; connecting the inductance-resistance load between the positive electrode and the negative electrode of the direct-current outlet of the rectifier cabinet, and observing and storing the waveform of the oscilloscope; the controller is connected to the excitation system through a network cable, the de-excitation switch is switched on through the controller, the trigger pulse is adjusted, and the waveform of the oscilloscope is recorded. The controller can receive input values of input voltage and resistance-inductance load of the rectifier bridge, and can give a waveform schematic diagram of output voltage of the rectifier bridge in a small current test and an effective value of the output voltage by combining a trigger angle so as to be used as reference. And comparing the waveform and the output voltage of the oscilloscope with the reference given by the controller, and judging the result of the small current test in time. In the test process, the temperature of the device is observed, and the phenomenon that the device and the controller are influenced due to overhigh temperature is prevented.
The utility model integrates the isolation transformer, the cooling fan, the phase sequence meter, the inductance resistance load, the oscilloscope, the temperature probe, the controller and the like into a set of device, thereby avoiding the problems of more using tools and instruments, very complicated wiring, low safety factor and influence on the test progress and result; the application of the phase sequence meter, the cooling fan and the temperature probe ensures the normal operation of the test and the normal operation of the equipment; the application of the oscilloscope and the storage equipment ensures the reliability of the test result and is convenient for archiving; the application of the inductance resistance load is closer to the property of the simulation rotor winding, so that the waveform result is more real; the bottom of the device is provided with a sliding wheel which can facilitate the device to move, thereby facilitating the carrying of the device.
The foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the present invention in any way and in any way, and it should be understood that modifications and additions may be made by those skilled in the art without departing from the scope of the present invention. Those skilled in the art can make various changes, modifications and evolutions equivalent to those made by the above-disclosed technical content without departing from the spirit and scope of the present invention, and all such changes, modifications and evolutions are equivalent embodiments of the present invention; meanwhile, any changes, modifications and evolutions of equivalent changes to the above embodiments according to the actual technology of the present invention are also within the scope of the technical solution of the present invention.
Claims (5)
1. An open-loop low-current test device for a large generator excitation system; the method is characterized in that: the device comprises a maintenance power supply, an isolation transformer, a phase sequence meter, a rectifier bridge, an inductance resistance load, an oscilloscope and a controller; the maintenance power supply, the isolation transformer and the rectifier bridge are sequentially connected; the rectifier bridge is connected with the oscilloscope through the inductance resistance load; the rectifier bridge is connected with the controller; a phase sequence meter is arranged between the isolation transformer and the rectifier bridge.
2. The large generator excitation system open-loop low-current test device as claimed in claim 1, characterized in that: and the testing device is also provided with a temperature probe and a cooling fan.
3. The large generator excitation system open-loop low-current test device as claimed in claim 2, characterized in that: the maintenance power supply is set as an external power supply for providing three-phase voltage for the isolation transformer.
4. The large generator excitation system open-loop low-current test device as claimed in claim 3, characterized in that: the rectifier bridge is set as a three-phase silicon-controlled rectifier bridge.
5. The large generator excitation system open-loop low-current test device as claimed in claim 4, characterized in that: the oscilloscope is a digital oscilloscope.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120376515.7U CN214375065U (en) | 2021-02-19 | 2021-02-19 | Large-scale generator excitation system open loop low current test device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120376515.7U CN214375065U (en) | 2021-02-19 | 2021-02-19 | Large-scale generator excitation system open loop low current test device |
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| CN214375065U true CN214375065U (en) | 2021-10-08 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112924792A (en) * | 2021-02-01 | 2021-06-08 | 中国葛洲坝集团机电建设有限公司 | Small load analysis device and method |
| EP4332593A1 (en) * | 2022-08-31 | 2024-03-06 | China Three Gorges Co., Ltd. | Excitation circuit, excitation small-current test method and electronic device |
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2021
- 2021-02-19 CN CN202120376515.7U patent/CN214375065U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112924792A (en) * | 2021-02-01 | 2021-06-08 | 中国葛洲坝集团机电建设有限公司 | Small load analysis device and method |
| EP4332593A1 (en) * | 2022-08-31 | 2024-03-06 | China Three Gorges Co., Ltd. | Excitation circuit, excitation small-current test method and electronic device |
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