CN217901987U - Short circuit test circuit and device - Google Patents
Short circuit test circuit and device Download PDFInfo
- Publication number
- CN217901987U CN217901987U CN202220623873.8U CN202220623873U CN217901987U CN 217901987 U CN217901987 U CN 217901987U CN 202220623873 U CN202220623873 U CN 202220623873U CN 217901987 U CN217901987 U CN 217901987U
- Authority
- CN
- China
- Prior art keywords
- inverter
- circuit
- short circuit
- short
- controller
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Inverter Devices (AREA)
Abstract
The utility model relates to the technical field of power supplies, in particular to short circuit test circuit and device, short circuit test circuit is connected with the main circuit, short circuit test circuit includes short circuit control module, test module, stable module, the main circuit includes photovoltaic input, inverter and electric wire netting, the photovoltaic input with the inverter is connected, the inverter with short circuit control module connects, short circuit control module respectively with test module with stable module connects, stable module with the electric wire netting is connected, short circuit control module is used for making the main circuit short circuit; the test module is used for testing the main circuit after the main circuit is short-circuited; the stabilizing module is used for stabilizing the main circuit when the main circuit is short-circuited. This scheme can be when accomplishing the short circuit test of dc-to-ac converter, maintains the stability of electric wire netting.
Description
Technical Field
The utility model relates to a power technical field, in particular to short circuit test circuit and device.
Background
The photovoltaic power generation system is a power generation system which directly converts light energy into electric energy without a thermal process, is clean and environment-friendly, is flexible and simple in application form, and is a new energy system which is advocated and applied in China. The photovoltaic grid-connected inverter is one of the core components of the photovoltaic power generation system, and the safety performance of the photovoltaic grid-connected inverter is concerned about whether the whole system stably operates. In the past, the photovoltaic grid-connected inverter directly uses a circuit breaker or other short-circuit modes when testing short circuit, the test process is neither safe in operation nor complex, safe and reliable short circuit test cannot be realized, and other products of a power grid can be affected when the short circuit test is carried out.
SUMMERY OF THE UTILITY MODEL
The utility model provides a short circuit test circuit and device can be when accomplishing the test of dc-to-ac converter short circuit, maintain the stability of electric wire netting.
In order to solve the technical problem, the utility model discloses a technical scheme be: providing a short circuit test circuit, wherein the short circuit test circuit is connected with a main circuit, the short circuit test circuit comprises a short circuit control module, a test module and a stabilization module, the main circuit comprises a photovoltaic input, an inverter and a power grid, the photovoltaic input is connected with the inverter, the inverter is connected with the short circuit control module, the short circuit control module is respectively connected with the test module and the stabilization module, the stabilization module is connected with the power grid, and the short circuit control module is used for enabling the main circuit to be in short circuit; the test module is used for testing the main circuit after the main circuit is short-circuited; the stabilizing module is used for stabilizing the main circuit when the main circuit is short-circuited.
In some embodiments, the stabilizing module includes a first stabilizing unit, a second stabilizing unit and a third stabilizing unit, a first end of the inverter is connected to the grid through the first stabilizing unit, a second end of the inverter is connected to the grid through the second stabilizing unit, a third end of the inverter is connected to the grid through the third stabilizing unit, and the first stabilizing unit is configured to eliminate impact between the first end of the inverter and the grid; the second stabilizing unit is used for eliminating the impact of the second end of the inverter and the power grid; the third stabilizing unit is used for eliminating the impact of the third end of the inverter and the power grid.
In some embodiments, the first stabilizing unit includes a resistor R1 and an inductor L1, the second stabilizing unit includes a resistor R2 and an inductor L2, the third stabilizing unit includes a resistor R3 and an inductor L3, a first end of the resistor R1 is connected to a first end of the inverter, a second end of the resistor R1 is connected to a first end of the inductor L1, and a second end of the inductor L1 is connected to a first end of the grid; a first end of the resistor R2 is connected to a second end of the inverter, a second end of the resistor R2 is connected to a first end of the inductor L2, and a second end of the inductor L2 is connected to a second end of the grid; the first end of the resistor R3 is connected with the third end of the inverter, the second end of the resistor R3 is connected with the first end of the inductor L3, and the second end of the inductor L3 is connected with the third end of the power grid.
In some embodiments, the short circuit control module includes a first short circuit unit for short-circuiting a first terminal of the inverter, a second terminal of the inverter, and a third terminal of the inverter; the second short-circuit unit is used for respectively enabling the first end of the inverter, the second end of the inverter and the third end of the inverter to be in short circuit with the fourth end of the inverter; the third short-circuiting unit is configured to short-circuit the first terminal of the inverter, the second terminal of the inverter, the third terminal of the inverter, and the fourth terminal of the inverter.
In some embodiments, the first short-circuiting unit includes a first controller, a second controller, and a third controller, the first controller connecting the first end of the inverter and the second end of the inverter; the second controller is connected with the second end of the inverter and the third end of the inverter; the third controller is connected with the first end of the inverter and the third end of the inverter.
In some embodiments, the second short circuit unit includes a fourth controller, a fifth controller, and a sixth controller, the fourth controller connecting the first end of the inverter and the fourth end of the inverter; the fifth controller is connected with the second end of the inverter and the fourth end of the inverter; the sixth controller is connected with the third end of the inverter and the fourth end of the inverter.
In some embodiments, the third short-circuiting unit includes a seventh controller, an eighth controller, and a ninth controller, the seventh controller connecting the first end of the inverter and the second end of the inverter; the eighth controller is connected with the second end of the inverter and the third end of the inverter; the ninth controller is connected with the third end of the inverter and the fourth end of the inverter.
In some embodiments, the stabilizing module comprises a fourth stabilizing unit, the fifth terminal of the inverter is connected to the grid through the fourth stabilizing unit, and the fourth stabilizing unit is used for eliminating the impact of the fifth terminal of the inverter and the grid.
In some embodiments, the short circuit control module is a controllable contactor.
In order to solve the technical problem, the utility model discloses a another technical scheme be: there is provided a short circuit test apparatus comprising a short circuit test circuit as described above.
Different from the prior art, the utility model provides a short circuit test circuit and device, short circuit test circuit is connected with the main circuit, short circuit test circuit includes short circuit control module, test module, stabilizing module, the main circuit includes photovoltaic input, inverter and electric wire netting, photovoltaic input with the inverter is connected, the inverter with short circuit control module connects, short circuit control module respectively with test module with stabilizing module connects, stabilizing module with the electric wire netting is connected, short circuit control module is used for making the main circuit short circuit; the test module is used for testing the main circuit after the main circuit is short-circuited; the stabilizing module is used for stabilizing the main circuit when the main circuit is short-circuited. This scheme can be when accomplishing the short circuit test of dc-to-ac converter, maintains the stability of electric wire netting.
Drawings
Fig. 1 is a block diagram of a short circuit testing circuit according to an embodiment of the present invention;
fig. 2 is a block diagram of a stabilizing module according to an embodiment of the present invention;
fig. 3 is a block diagram of a short circuit control module according to an embodiment of the present invention;
fig. 4 is a block diagram of a first short-circuit unit according to an embodiment of the present invention;
fig. 5 is a block diagram of a second short circuit unit according to an embodiment of the present invention;
fig. 6 is a block diagram of a third short-circuit unit according to an embodiment of the present invention;
fig. 7 is a schematic circuit diagram of a short circuit test circuit according to an embodiment of the present invention;
fig. 8 is a schematic circuit diagram of another short circuit testing circuit according to an embodiment of the present invention;
fig. 9 is a schematic circuit diagram of another short circuit testing circuit according to an embodiment of the present invention.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described in more detail with reference to the accompanying drawings and specific embodiments. It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for descriptive purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, fig. 1 is a block diagram of a short circuit testing circuit 10 according to an embodiment of the present invention. As shown in fig. 1, the short circuit test circuit 10 is connected to a main circuit, the short circuit test circuit 10 includes a short circuit control module 11, a test module 12, and a stabilization module 13, the main circuit includes a photovoltaic input 21, an inverter 22, and a power grid 23, the photovoltaic input 21 is connected to the inverter 22, the inverter 22 is connected to the short circuit control module 11, the short circuit control module 11 is connected to the test module 12 and the stabilization module 13, respectively, and the stabilization module 13 is connected to the power grid 23.
The short circuit control module 11 is configured to short-circuit the main circuit, the test module 12 is configured to test the main circuit after the short circuit of the main circuit, and the stabilizing module 13 is configured to stabilize the main circuit when the main circuit is short-circuited.
In the embodiment of the present invention, the testing module 12 can be a multimeter or the like, and can test the voltage and the current.
The embodiment of the utility model provides a can pass through short circuit control module 11 will the main circuit short circuit, the rethread test module 12 tests data such as electric current, the voltage of main circuit during the main circuit short circuit, and pass through main circuit after stabilizing module 13 and stabilizing the short circuit. The inverter short-circuit test is completed, and meanwhile, the stability of a power grid is maintained.
The embodiment of the utility model provides a can carry out the short circuit test to the three-phase electric wire netting, specifically as follows:
referring to fig. 2, fig. 2 is a block diagram of a stabilizing module 13 according to an embodiment of the present invention. As shown in fig. 2, in some embodiments, the stabilizing module 13 includes a first stabilizing unit 131, a second stabilizing unit 132 and a third stabilizing unit 133, a first end of the inverter 22 is connected to the grid 23 through the first stabilizing unit 131, a second end of the inverter 22 is connected to the grid 23 through the second stabilizing unit 132, and a third end of the inverter 22 is connected to the grid 23 through the third stabilizing unit 133.
The first stabilizing unit 131 is configured to eliminate the impact between the first end of the inverter 22 and the grid 23, the second stabilizing unit 132 is configured to eliminate the impact between the second end of the inverter 22 and the grid 23, and the third stabilizing unit 133 is configured to eliminate the impact between the third end of the inverter 22 and the grid 23.
Referring to fig. 3, fig. 3 is a block diagram of a short circuit control module 11 according to an embodiment of the present invention. As shown in fig. 3, in some embodiments, the short circuit control module 11 includes a first short circuit unit 111, a second short circuit unit 112, and a third short circuit unit 113.
The first short-circuiting unit 111 is configured to short-circuit the first terminal a of the inverter 22, the second terminal B of the inverter 22, and the third terminal C of the inverter 22. The second short-circuiting unit 112 is configured to short-circuit the first terminal a of the inverter 22, the second terminal B of the inverter 22, and the third terminal C of the inverter 22 with the fourth terminal N of the inverter 22, respectively. The third short-circuiting unit 113 is configured to short-circuit the first terminal a of the inverter 22, the second terminal B of the inverter 22, the third terminal C of the inverter 22, and the fourth terminal N of the inverter 22.
Referring to fig. 4, fig. 4 is a block diagram of a first short-circuit unit 111 according to an embodiment of the present invention. As shown in fig. 4, in some embodiments, the first short-circuit unit 111 includes a first controller 1111, a second controller 1112, and a third controller 1113, the first controller 1111 connects the first terminal a of the inverter 22 and the second terminal B of the inverter 22, the second controller 1112 connects the second terminal B of the inverter 22 and the third terminal C of the inverter 22, and the third controller 1113 connects the first terminal a of the inverter 22 and the third terminal C of the inverter 22.
Referring to fig. 5, fig. 5 is a block diagram of a second short circuit unit 112 according to an embodiment of the present invention. As shown in fig. 5, in some embodiments, the second short circuit unit 112 includes a fourth controller 1121, a fifth controller 1122, and a sixth controller 1123. The fourth controller 1121 connects the first terminal a of the inverter 22 and the fourth terminal N of the inverter 22, the fifth controller 1122 connects the second terminal B of the inverter 22 and the fourth terminal N of the inverter 22, and the sixth controller 1123 connects the third terminal C of the inverter 22 and the fourth terminal N of the inverter 22.
Referring to fig. 6, fig. 6 is a block diagram of a third short-circuit unit 113 according to an embodiment of the present invention. As shown in fig. 6, in some embodiments, the third short-circuit unit 113 includes a seventh controller 1131, an eighth controller 1132 and a ninth controller 1133. The seventh controller 1131 is connected to the first end a of the inverter 22 and the second end B of the inverter 22, the eighth controller 1132 is connected to the second end B of the inverter 22 and the third end C of the inverter 22, and the ninth controller 1133 is connected to the third end C of the inverter 22 and the fourth end N of the inverter 22.
Referring to fig. 7, fig. 7 is a schematic circuit structure diagram of a short circuit test circuit 10 according to an embodiment of the present invention. As shown in fig. 7, in some embodiments, the first stabilizing unit 131 of the stabilizing module 13 includes a resistor R1 and an inductor L1, the second stabilizing unit 132 of the stabilizing module 13 includes a resistor R2 and an inductor L2, and the third stabilizing unit 132 of the stabilizing module 13 includes a resistor R3 and an inductor L3. A first end of the resistor R1 is connected with a first end A of the inverter, a second end of the resistor R1 is connected with a first end of the inductor L1, and a second end of the inductor L1 is connected with a first end of the power grid; a first end of the resistor R2 is connected to a second end B of the inverter, a second end of the resistor R2 is connected to a first end of the inductor L2, and a second end of the inductor L2 is connected to a second end of the grid; the first end of the resistor R3 is connected with the third end C of the inverter, the second end of the resistor R3 is connected with the first end of the inductor L3, and the second end of the inductor L3 is connected with the third end of the power grid.
Specifically, as shown in fig. 7, the first short-circuiting unit 111 has four short-circuiting methods: firstly, the first controller S1 is closed, and the rest controllers are not closed; second, the second controller S2 is closed, and the rest controllers are not closed; third, the third controller S3 is closed, and the remaining controllers are not closed; second, the first controller S1 and the second controller S2 are closed, and the remaining controllers are not closed.
The second short circuit unit 112 has three short circuit methods: firstly, the fourth controller S4 is closed, and the rest controllers are not closed; secondly, the fifth controller S5 is closed, and the rest controllers are not closed; third, the sixth control S6 is closed, and the remaining controls are not closed.
The third short-circuit unit 113 shares a short-circuit method: that is, the seventh controller S7, the eighth controller S8, and the ninth controller S9 are closed, and the remaining controllers are not closed.
In this embodiment, the resistor and the inductor are connected in series to achieve strong impact resistance and can be shunted, and when the main circuit is short-circuited, the main circuit is protected. If only the resistor can only shunt, the impact resistance is poor, and the main circuit cannot be protected. If only the inductor is provided, the main circuit can be protected from impact, but the current cannot be reduced. If the resistor and the inductor are connected in parallel, the impact resistance and the shunt effect are poor.
In some embodiments, the short circuit control module is a controllable contactor. The controllable contactor can avoid the problems of cost increase and high actual loss caused by using a switch tube.
Referring to fig. 8, fig. 8 is a schematic circuit diagram of another short-circuit test circuit 10 according to an embodiment of the present invention.
The embodiment of the utility model provides a can also carry out the short circuit test to single-phase electric wire netting, specifically as follows:
in some embodiments, the stabilizing module 13 includes a fourth stabilizing unit 134, the fifth terminal D of the inverter 22 is connected to the grid 23 through the fourth stabilizing unit 134, and the fourth stabilizing unit 134 is configured to eliminate the impact of the fifth terminal D of the inverter 22 with the grid 23.
In some embodiments, the short circuit control module 11 includes a fourth short circuit unit 114, the fourth short circuit unit 114 includes a tenth controller S10, the tenth controller S10 connects the fifth terminal D of the inverter and the sixth terminal N of the inverter, and the tenth controller S10 is configured to short circuit the fifth terminal D of the inverter and the sixth terminal N of the inverter.
Referring to fig. 9, fig. 9 is a schematic circuit diagram of another short circuit testing device 10 according to an embodiment of the present invention.
The embodiment of the utility model provides a can also carry out the short circuit test to three-wire electric wire netting of three-phase, specifically as follows:
in some embodiments, the short circuit control module 11 includes a fifth short circuit unit 115, the fifth short circuit unit 115 includes an eleventh controller S11, a twelfth controller S12 and a thirteenth controller S13, the eleventh controller S11 connects the sixth terminal E of the inverter 22 and the seventh terminal F of the inverter 22, the twelfth controller S12 connects the seventh terminal F of the inverter 22 and the eighth terminal G of the inverter 22, and the thirteenth controller S13 connects the sixth terminal E of the inverter 22 and the eighth terminal G of the inverter 22.
Specifically, as shown in fig. 9, the fifth short-circuit unit 115 has four short-circuit methods: first, the eleventh control S11 is closed, the remaining controls are not closed; secondly, the twelfth controller S12 is closed, and the rest controllers are not closed; the thirteenth controller S13 is closed, and the remaining controllers are not closed; second, the eleventh controller S11 and the twelfth controller S12 are closed, and the remaining controllers are not closed.
The utility model provides a short circuit test circuit 10, short circuit test circuit 10 is connected with the main circuit, short circuit test circuit 10 includes short circuit control module 11, test module 12, stabilization module 13, the main circuit includes photovoltaic input 21, inverter 22 and electric wire netting 23, photovoltaic input 21 with inverter 22 is connected, inverter 22 with short circuit control module 11 is connected, short circuit control module 11 respectively with test module 12 with stabilization module 12 is connected, stabilization module 13 with electric wire netting 23 is connected, short circuit control module 11 is used for making the main circuit short circuit; the test module 12 is configured to test the main circuit after the main circuit is short-circuited; the stabilizing module 13 is configured to stabilize the main circuit when the main circuit is shorted. This scheme can be when accomplishing the short circuit test of dc-to-ac converter, maintains the stability of electric wire netting.
The embodiment of the utility model provides a still provide a short circuit testing arrangement, short circuit testing arrangement includes as above short circuit test circuit 10.
It should be noted that the preferred embodiments of the present invention are described in the specification and the drawings, but the present invention can be realized in many different forms, and is not limited to the embodiments described in the specification, and these embodiments are not provided as additional limitations to the present invention, and are provided for the purpose of making the understanding of the disclosure of the present invention more thorough and complete. Moreover, the above technical features are combined with each other to form various embodiments which are not listed above, and all the embodiments are regarded as the scope of the present invention; further, modifications and variations will occur to those skilled in the art in light of the foregoing description, and it is intended to cover all such modifications and variations as fall within the true spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A short circuit test circuit is characterized in that the short circuit test circuit is connected with a main circuit, the short circuit test circuit comprises a short circuit control module, a test module and a stabilization module, the main circuit comprises a photovoltaic input, an inverter and a power grid, the photovoltaic input is connected with the inverter, the inverter is connected with the short circuit control module, the short circuit control module is respectively connected with the test module and the stabilization module, the stabilization module is connected with the power grid,
the short circuit control module is used for enabling the main circuit to be in short circuit;
the test module is used for testing the main circuit after the main circuit is short-circuited;
the stabilizing module is used for stabilizing the main circuit when the main circuit is short-circuited.
2. The short circuit test circuit of claim 1, wherein the stabilization module comprises a first stabilization unit, a second stabilization unit, and a third stabilization unit, wherein a first end of the inverter is connected to the grid through the first stabilization unit, a second end of the inverter is connected to the grid through the second stabilization unit, and a third end of the inverter is connected to the grid through the third stabilization unit,
the first stabilizing unit is used for eliminating the impact of the first end of the inverter and the power grid;
the second stabilizing unit is used for eliminating the impact of the second end of the inverter and the power grid;
the third stabilizing unit is used for eliminating the impact of the third end of the inverter and the power grid.
3. The short circuit test circuit of claim 2, wherein the first stabilizing unit comprises a resistor R1 and an inductor L1, the second stabilizing unit comprises a resistor R2 and an inductor L2, the third stabilizing unit comprises a resistor R3 and an inductor L3,
a first end of the resistor R1 is connected with a first end of the inverter, a second end of the resistor R1 is connected with a first end of the inductor L1, and a second end of the inductor L1 is connected with a first end of the power grid;
a first end of the resistor R2 is connected to a second end of the inverter, a second end of the resistor R2 is connected to a first end of the inductor L2, and a second end of the inductor L2 is connected to a second end of the grid;
the first end of the resistor R3 is connected with the third end of the inverter, the second end of the resistor R3 is connected with the first end of the inductor L3, and the second end of the inductor L3 is connected with the third end of the power grid.
4. The short circuit test circuit of claim 3, wherein the short circuit control module comprises a first short circuit unit, a second short circuit unit, and a third short circuit unit,
the first short-circuit unit is used for short-circuiting a first end of the inverter, a second end of the inverter and a third end of the inverter;
the second short-circuit unit is used for respectively enabling the first end of the inverter, the second end of the inverter and the third end of the inverter to be in short circuit with the fourth end of the inverter;
the third short-circuiting unit is configured to short-circuit the first terminal of the inverter, the second terminal of the inverter, the third terminal of the inverter, and the fourth terminal of the inverter.
5. The short circuit test circuit of claim 4, wherein the first shorting unit comprises a first controller, a second controller, and a third controller,
the first controller is connected with a first end of the inverter and a second end of the inverter;
the second controller is connected with the second end of the inverter and the third end of the inverter;
the third controller is connected with the first end of the inverter and the third end of the inverter.
6. The short circuit test circuit of claim 4, wherein the second short circuit unit comprises a fourth controller, a fifth controller, and a sixth controller,
the fourth controller is connected with the first end of the inverter and the fourth end of the inverter;
the fifth controller is connected with the second end of the inverter and the fourth end of the inverter;
the sixth controller is connected with the third end of the inverter and the fourth end of the inverter.
7. The short circuit test circuit of claim 4, wherein the third short circuit unit comprises a seventh controller, an eighth controller, and a ninth controller,
the seventh controller is connected with the first end of the inverter and the second end of the inverter;
the eighth controller is connected with the second end of the inverter and the third end of the inverter;
the ninth controller is connected to the third terminal of the inverter and the fourth terminal of the inverter.
8. The short circuit test circuit of claim 1, wherein the stabilizing module comprises a fourth stabilizing unit, through which the fifth terminal of the inverter is connected to the grid, the fourth stabilizing unit being configured to eliminate an impact of the fifth terminal of the inverter with the grid.
9. The short circuit test circuit of any one of claims 1-8, wherein the short circuit control module is a controllable contactor.
10. A short circuit test device comprising the short circuit test circuit of any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220623873.8U CN217901987U (en) | 2022-03-21 | 2022-03-21 | Short circuit test circuit and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220623873.8U CN217901987U (en) | 2022-03-21 | 2022-03-21 | Short circuit test circuit and device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217901987U true CN217901987U (en) | 2022-11-25 |
Family
ID=84105428
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220623873.8U Active CN217901987U (en) | 2022-03-21 | 2022-03-21 | Short circuit test circuit and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217901987U (en) |
-
2022
- 2022-03-21 CN CN202220623873.8U patent/CN217901987U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9042146B2 (en) | DC pre-charge circuit | |
| CN110829575B (en) | Slow-start bus circuit, method and uninterruptible power supply | |
| CN112467839B (en) | Battery cluster management device and battery energy storage system | |
| CN102435899A (en) | Locomotive traction converter test apparatus and method thereof | |
| CN201749157U (en) | Frequency converter power module test circuit of wind driven generator | |
| CN103997056B (en) | Be used for method and the photovoltaic DC-to-AC converter of the burble point that checks photovoltaic DC-to-AC converter | |
| CN112904161B (en) | Method for testing main insulation and turn-to-turn insulation of variable frequency motor and topological structure | |
| WO2024125075A1 (en) | Grounding impedance measurement apparatus and method, and inverter | |
| CN217901987U (en) | Short circuit test circuit and device | |
| CN207504774U (en) | Variable frequency drive and system | |
| CN203191414U (en) | Connection mode converter for transmission line parameter test | |
| CN212586509U (en) | Energy feedback type load testing system | |
| CN103576034A (en) | Detection device of charger power module | |
| CN104297701B (en) | The shut-off test platform and its method of single bridge arm in three level H-bridge inverters | |
| CN113156290A (en) | Power component testing power supply and power diode component testing platform | |
| CN217607699U (en) | Slow starting device of three-phase grid-connected star-connected chain type current converter | |
| CN116298561B (en) | Voltage phase sequence detection system for four-quadrant frequency converter | |
| CN110739867A (en) | Energy feedback device and slow starting method thereof | |
| CN218974488U (en) | Converter aging test system | |
| CN216851317U (en) | Multifunctional self-checking closing power supply device | |
| CN110165904B (en) | Transformer short circuit test power supply | |
| CN203658486U (en) | Detection device of charger power module | |
| CN112217411B (en) | Reactive power converter and soft start and overhaul method thereof | |
| CN110661331A (en) | AC-DC converter | |
| CN109398146B (en) | Direct current charging and monitoring system for charging pile |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |