CN105487018A - Testing device, electric inverse cutting cabinet and testing system of converter - Google Patents

Abstract

The embodiment of the invention discloses a converter testing device, an electrical inverter cabinet and a testing system. The test device of the converter includes a controller, a first circuit break component and a second circuit break component, wherein: the first circuit break component is connected in series between the power grid and the first converter to be tested, and the second circuit break component is connected in series between the power grid and the first converter to be tested. between the second converter to be tested; the controller is connected to the first circuit break component and the second circuit break component respectively, and is used to control only one of the first circuit break component and the second circuit break component to be in a closed state and the other to be in an open state. open state. By adopting the embodiments of the present invention, the safety during the switching process of the converter can be improved.

Description

Test fixtures, electrical switching cabinets and test systems for converters

technical field

The invention relates to the technical field of wind power, in particular to a test device for a converter, an electrical switching cabinet and a test system.

Background technique

A converter is an electrical device that changes the voltage, frequency, phase number and/or other power parameters or characteristics of the power system. The converter is usually used in the grid-connected power generation system to rectify and invert the input current , to integrate the processed electric energy into the grid.

In the grid-connected power generation system, the output end of the power supply is connected to the input end of the converter, and the output end of the converter is connected to the grid. In practical applications, the performance of the converter can usually be certified and tested, and the AC learning of the converter test can also be carried out through the above grid-connected power generation system. When switching between the above two scenarios, the power supply needs to be switched to The output terminal of the first converter to be tested is disconnected from the input terminal of the first converter to be tested, the output terminal of the first converter to be tested is disconnected from the grid, and then another transformer is manually connected between the power supply and the grid. Converter (such as the second converter, etc.).

The switching process of the aforementioned converters has at least the following problems: when switching between the above two scenarios, it is necessary to manually switch the converters and connect the corresponding output terminals to the input terminals, which will cause the risk of electric shock .

Contents of the invention

Embodiments of the present invention provide a test device for a converter, an electrical switching cabinet and a test system, by connecting the first circuit breaker assembly in series between the power grid and the first converter to be tested, and connecting the second circuit breaker assembly in series Between the power grid and the second converter to be tested, and the controller controls the first circuit breaker component or the second circuit breaker component to be in a closed state, so as to control the on and off of different grid-connected circuits, thereby improving the efficiency of the converter. Security during device testing.

To achieve the above purpose, an embodiment of the present invention provides a test device for a converter. The test device includes a controller, a first disconnect assembly, and a second disconnect assembly, wherein:

The first circuit breaker assembly is connected in series between the grid and the first converter to be tested, and the second circuit breaker is connected in series between the grid and the second converter to be tested; the controller They are respectively connected to the first circuit breaker assembly and the second circuit breaker assembly, and are used to control only one of the first circuit breaker assembly and the second circuit breaker assembly to be in a closed state and the other to be in an open state.

In order to achieve the above object, an embodiment of the present invention provides an electrical switching cabinet, including the test device for the above-mentioned converter.

In order to achieve the above object, an embodiment of the present invention provides a test system, including the first converter to be tested, the electrical switching cabinet provided in the above embodiment, the second converter to be tested, a power supply and a power grid, wherein:

The first converter to be tested and the second converter to be tested are respectively connected in series with the power supply; the electrical switching cabinets are respectively connected in series between the first converter to be tested and the power grid , and between the second converter under test and the grid, for controlling the first converter under test and the power supply to communicate with the grid or the second converter under test and the grid The power source is in communication with the grid.

The test device for the converter provided by the embodiment of the present invention, the electrical switching cabinet and the test system, connect the first circuit breaker assembly in series between the grid and the first converter to be tested, and connect the second circuit breaker assembly in series with the grid and the second converter to be tested, and then, the controller controls only one of the first circuit breaker assembly and the second circuit breaker to be in the closed state, and the other is in the open state, thereby controlling the first converter to be tested The inverter and the second converter to be tested are switched to be connected to the grid, and the grid-connected circuit test of the converter can be completed based on the first circuit breaker component or the second circuit breaker component, thereby avoiding the risk of electric shock caused by manual switching of the converter , to improve the safety during the switching process of the converter.

Description of drawings

Fig. 1 is a kind of structural diagram of the test system of the converter provided by the embodiment of the present invention;

Fig. 2 is another schematic structural diagram of the test system of the converter provided by the embodiment of the present invention;

Fig. 3 is a schematic diagram of each phase connection circuit of the converter provided by the embodiment of the present invention;

Fig. 4 is a schematic diagram of the front structure of the circuit breaker provided by the embodiment of the present invention;

Fig. 5A is a schematic diagram of the connection of the secondary control and protection circuit of the converter provided by the embodiment of the present invention;

5B is a schematic diagram of a connection circuit between a circuit breaker and a secondary control and protection circuit provided by an embodiment of the present invention;

Fig. 6 is a schematic diagram of the touch display interface where the indicator light is located in the secondary control and protection circuit of the converter provided by the embodiment of the present invention;

Fig. 7 is a schematic diagram of the front structure of the transfer busbar provided by the embodiment of the present invention;

Fig. 8 is a schematic diagram of the side structure of the double busbar provided by the embodiment of the present invention;

9 is a schematic diagram of a control circuit of a heat dissipation system of a test device for a converter provided by an embodiment of the present invention;

FIG. 10 is a schematic diagram of any two-phase voltage measurement circuit provided by an embodiment of the present invention.

illustration:

1. The first converter to be tested 2. The second converter to be tested

3. Power supply 4. Power grid

5. Test device 51 and controller of the converter

52. The first circuit breaker 521. The first circuit breaker

522, the second circuit breaker 523, the third circuit breaker

53, the second circuit breaker 531, the fourth circuit breaker

532, the fifth circuit breaker 533, the sixth circuit breaker

6. Step-up transformer 7. Secondary control protection circuit

8. Input terminal 9. Transition busbar

10. Double busbar 11. Through hole

12, radiator 121, cooling fan

122. Switch 13. Voltage measuring equipment

detailed description

The inventive idea of this solution is to connect the first circuit breaking assembly in series between the grid and the first converter to be tested, and connect the second circuit breaking assembly in series between the grid and the second converter to be tested, and then, through The controller controls only one of the first circuit breaker component and the second circuit breaker component to be in the closed state, and the other is in the open state, thereby controlling the first converter to be tested and the second converter to be tested to be mutually switched and connected to the power grid At the same time, the grid-connected circuit test of the converter can be completed based on the first circuit breaker component or the second circuit breaker component, thereby avoiding the risk of electric shock caused by manual switching of the converter and improving the safety during the switching process of the converter.

The test device for the converter of the embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

Embodiment one

Fig. 1 is a schematic structural diagram of a test system for a converter provided by an embodiment of the present invention.

As shown in Figure 1, the test device 5 of the converter is used for the test of the grid-connected loop of the converter, and the grid-connected loop of the converter includes a first converter to be tested 1, a second converter to be tested 2. The power supply 3 and the grid 4, the first converter 1 to be tested and the second converter 2 to be tested are respectively connected in series between the power supply 3 and the grid 4, and the testing device includes a controller 51, a first circuit breaker assembly 52 and The second circuit breaker assembly 53, wherein: the first circuit breaker assembly 52 is connected in series between the grid 4 and the first converter to be tested 1, and the second circuit breaker component 53 is connected in series between the grid 4 and the second converter to be tested 2; The controller 51 is respectively connected with the first breaking assembly 52 and the second breaking assembly 53, and is used for controlling only one of the first breaking assembly 52 and the second breaking assembly 53 to be in a closed state and the other to be in an open state.

Among them, the test of the grid-connected circuit of the converter can include the phase loss test of the converter and the load dump test, etc. The phase loss test of the converter can include the single-phase continuity test, the double-phase continuity test and the three-phase disconnection test. open test etc. The first circuit breaking assembly 52 or the second circuit breaking assembly 53 is used to close, carry and break the current under normal circuit conditions, and can close, carry and break the current under abnormal circuit conditions within a specified time. . The power supply 3 can be a DC power supply or an AC power supply.

Specifically, an existing grid-connected power generation system may include a power source 3 , a converter and a grid 4 . The above-mentioned grid-connected power generation system can be used to carry out certification and testing of the performance of the converter, and the above-mentioned grid-connected power generation system can also be used to conduct AC learning for converter testing, such as training for new employees. In this way, the test scenarios of the type test of the converter can include two types, namely the certification test scenario of the converter and the exchange learning scenario. In order to conveniently conduct converter type tests on converters in different scenarios, the first circuit breaker assembly 52 or the second circuit breaker assembly 53 can be used to control the grid-connected circuits formed by converters in different scenarios, so as to The converter in the grid-connected loop is tested. Wherein, as shown in FIG. 1 , the first circuit breaker assembly 52 can be connected to the first converter 1 to be tested in a certain scenario, and the second circuit breaker assembly 53 can be connected to the second converter 2 to be tested in another scenario. connection, specifically, when in one of the converter certification test scenario and the AC learning scenario, it is necessary to connect the output end of the power supply 3 to the input end of the first converter 1 to be tested, and the first to be tested The output end of the current transformer under test 1 is connected to the input end of the first circuit breaker assembly 52 , and the output end of the first circuit breaker assembly 52 is connected to the power grid 4 , so that the grid-connected circuit test is performed on the first converter to be tested 1 . When changing the test scene, the first circuit breaker assembly 52 can be disconnected, so that the grid-connected loop formed by the power supply 3, the first converter 1 to be tested and the grid 4 is disconnected, and at the same time, the second circuit breaker assembly 53 is closed, thereby The grid-connected loop formed by the power supply 3 , the second converter under test 2 and the grid 4 is connected, so that the grid-connected loop test is performed on the second converter under test 2 . The controller 51 is respectively connected to the first circuit breaker assembly 52 and the second circuit breaker assembly 53. If the first circuit breaker assembly 52 is in the closed state, at this time, the user closes the second circuit breaker assembly 53, and the controller will control the first circuit breaker assembly 52 to remain in the closed state. In the closed state, the grid-connected circuit formed by it is connected, while the grid-connected circuit formed by the second circuit breaker component 53 is still in the disconnected state until the user disconnects the first circuit breaker component 52 .

The first circuit breaker assembly 52 and the second circuit breaker assembly 53 may include a plurality of switchgears, and the converter type tests, such as phase loss test and load rejection test, can be performed by closing and opening the switchgears. Taking three-phase power as an example, each phase can be connected to a switchgear. By closing or disconnecting the switchgear, the corresponding phase can be connected to the grid-connected circuit, thereby completing three-phase conduction, one-way conduction, two-phase conduction and three-phase conduction. Phase disconnection etc. test.

The test device for the converter provided by the embodiment of the present invention connects the first circuit breaker assembly in series between the grid and the first converter to be tested, and connects the second circuit breaker in series between the grid and the second converter to be tested. Then, the controller controls only one of the first circuit breaker assembly and the second circuit breaker assembly to be in the closed state, and the other is in the open state, thereby controlling the first converter to be tested and the second converter to be tested At the same time, the test of the grid-connected circuit of the converter can be completed based on the first circuit breaker component or the second circuit breaker component, thereby avoiding the risk of electric shock caused by manual switching of the converter and improving the efficiency of the converter switching process. security.

Embodiment two

FIG. 2 is a schematic structural diagram of another embodiment of a test system for a converter provided by the present invention, which can be regarded as another specific implementation solution of FIG. 1 .

As shown in Figure 2, the test device 5 of the converter is used for the test of the grid-connected loop of the converter, and the grid-connected loop of the converter includes the first converter to be tested 1, the second converter to be tested 2. The power supply 3 and the grid 4, the first converter 1 to be tested and the second converter 2 to be tested are respectively connected in series between the power supply 3 and the grid 4, and the testing device includes a controller 51, a first circuit breaker assembly 52 and The second circuit breaker assembly 53, wherein: the first circuit breaker assembly 52 is connected in series between the grid 4 and the first converter to be tested 1, and the second circuit breaker component 53 is connected in series between the grid 4 and the second converter to be tested 2; The controller 51 is respectively connected with the first breaking assembly 52 and the second breaking assembly 53, and is used for controlling only one of the first breaking assembly 52 and the second breaking assembly 53 to be in a closed state and the other to be in an open state.

As shown in FIG. 2 , an existing grid-connected power generation system generally includes a power supply 3 (DC power supply or AC power supply), a converter, a step-up transformer 6 and a power grid 4 . When in one of the certification test scene and the AC learning scene of the converter, the output terminal of the power supply 3 needs to be connected to the input terminal of the first converter to be tested 1, and the output terminal of the first converter to be tested 1 The output end is connected to the input end of the first circuit breaker assembly 52 , the output end of the first circuit breaker assembly 52 is connected to the input end of the step-up transformer 6 , and the output end of the step-up transformer 6 is connected to the grid 4 . When changing the test scene, the first circuit breaker assembly 52 can be disconnected, so that the grid-connected loop formed by the power supply 3, the first converter 1 to be tested, the step-up transformer 6 and the grid 4 is disconnected, and at the same time, the second circuit breaker assembly is closed. Disconnecting the circuit assembly 53, so that the power supply 3, the second converter under test 2, the step-up transformer 6 and the grid 4 form a grid-connected loop.

In addition, in order to facilitate the test of the grid-connected circuit of the converter, the power source 3 may be a power source output by a wind power generating set.

In addition, for the first converter under test 1 and the second converter under test 2 including two windings, each winding may include three phases, for this purpose, an optional processing is provided in the embodiment of the present invention , specifically includes: the first circuit breaker assembly 52 includes a first circuit breaker 521, a second circuit breaker 522 and a third circuit breaker 523, and correspondingly, the first circuit breaker 521 and the first winding of the first converter 1 to be tested The second circuit breaker 522 is connected to the remaining phases in the first winding of the first converter 1 to be tested; the third circuit breaker 523 is connected to each of the second windings of the first converter 1 to be tested. connected.

Specifically, as shown in FIG. 3, the input end of the first circuit breaker 521 is connected to two phases in the first winding of the first converter 1 to be tested, and the output end of the first circuit breaker 521 is connected to the grid 4. The input terminal of the second circuit breaker 522 is connected with the remainder of the first winding, and the output terminal of the second circuit breaker 522 is connected to the power grid 4. By closing and disconnecting the first circuit breaker 521 and the second circuit breaker 522, it can Conduct tests such as one-way conduction, two-phase conduction, three-phase conduction and three-phase disconnection. The input terminal of the third circuit breaker 523 is connected to each phase in the second winding, and the output terminal of the third circuit breaker 523 is connected to Connected to the power grid 4, through the closing and opening of the third circuit breaker 523, tests such as three-phase conduction and three-phase disconnection can be performed.

For the second circuit breaker assembly 53, its component composition and corresponding processing can be the same as that of the first circuit breaker assembly 52 and the corresponding processing, that is, the second circuit breaker assembly 53 includes a fourth circuit breaker 531, a fifth circuit breaker 532 and a fourth circuit breaker 532. Six circuit breakers 533, correspondingly, the fourth circuit breaker 531 is connected to two phases of the first winding of the second converter to be tested 2, and the fifth circuit breaker 532 is connected to the first winding of the second converter to be tested 2 The remaining phases are connected; the sixth circuit breaker 533 is connected to each phase of the second winding of the second converter 2 to be tested. Wherein, the above-mentioned three circuit breakers are connected to the second converter 2 to be tested and the grid 4 in the same way as the first circuit breaker 52 , which can be referred to the above-mentioned related content, and will not be repeated here.

In addition, in order to reduce the adverse effects of short circuit, power failure, etc. on the grid-connected circuit, a plurality of secondary control and protection circuits 7 can be used to form the controller 51. The opening and closing of the circuit breaker can be controlled, and at least one input terminal 8 can be set for each circuit breaker in the first circuit breaker assembly 52 and the second circuit breaker assembly 53. Correspondingly, the output terminal of the secondary control protection circuit 7 and its corresponding The input terminal 8 is connected to control the closing and opening of the corresponding circuit breaker, and to protect the short circuit and/or power failure in the grid-connected circuit.

As shown in Figure 4, one or more input terminals 8 are provided on the top of each circuit breaker in the first circuit breaker assembly 52 and the second circuit breaker assembly 53, and each input terminal 8 can be provided with a number, such as 1-1, 2-1 or 3-1, etc., the number of input terminals 8 can be determined according to the number of phases connected to the corresponding circuit breaker, for example, based on the above-mentioned first circuit breaker 521, second circuit breaker 522, The setting of the third circuit breaker 523, the fourth circuit breaker 531, the fifth circuit breaker 532 and the sixth circuit breaker 533, the first circuit breaker 521 connects the two phases in the first winding, therefore, the first circuit breaker 521 can be set There are two input terminals 8, as shown in FIG. In addition, a corresponding control and protection system can be set for each input terminal 8. The circuit of each control and protection system is usually called the secondary control and protection circuit 7, and the schematic diagram of the secondary control and protection circuit 7 of each control and protection system can be shown in FIG. 5A As shown in FIG. 5B , a schematic diagram of a connection circuit between the circuit breaker and the secondary control and protection circuit 7 is shown. Figure 5A includes three indicator lights, which can be set to different colors, such as setting the three indicator lights in Figure 5A as red, green and yellow indicators, which can be used to indicate closing indication and opening indication Or energy storage instructions, etc.; the processing unit is used to complete the processing logic of the user's closing or opening operation; M represents the motor, which is used to control the opening and closing of the switch button of the circuit breaker, avoiding the risk of electric shock caused by manual direct touch of the switch button ; A switch is also included in FIG. 5A ; the rectangular frame in FIG. 5A represents a coil. Based on the secondary control and protection circuit 7 as shown in Figure 5A, when the user clicks the closing or opening button, the processing unit controls the light on or off through the corresponding processing logic to show the user the corresponding closing instruction or opening button. At the same time, start the motor to perform closing or opening operation, so as to complete the closing and opening of the circuit breaker. FIG. 6 is a schematic diagram of a touch display interface of the position of the indicator light in the circuit of the control and protection system of the converter provided by the embodiment of the present invention. Figure 6 is the touch display interface at the location of the indicator light in Figure 5A, the touch display interface can be divided into 7 lines of display, which can include closing indication, opening indication, electric energy storage, energy storage indication, chain contact, Closing and opening, among them, electric energy storage, closing and opening are buttons respectively, and the user can perform opening and closing operations through the two buttons of closing and opening, closing indication, opening indication and energy storage indication They can be indicator light interfaces respectively, and the interlocking contacts can be used to make only one of the first breaking assembly 52 and the second breaking assembly 53 in a closed state.

In addition, considering that the lead wires of the input ends of the circuit breakers in the first circuit breaker assembly 52 and the second circuit breaker assembly 53 are usually short, which is not conducive to the user's quick connection between the devices, for this reason, the corresponding switching device can be used to The two connected devices are forwarded. The transfer device may specifically be a transfer busbar 9, and the corresponding processing includes: the transfer busbar 9 is connected in series between the first circuit breaker assembly 52 and the first converter 1 to be tested, and/or, connected in series in the second Between the disconnection assembly 53 and the second converter 2 under test.

Specifically, a plurality of transfer busbars 9 may be provided, and as shown in FIG. 9 is connected at one end, and the other end is connected with the first converter 1 to be tested or the second converter 2 to be tested.

It should be noted that, in order to prevent the transfer busbar 9 from being oxidized when it is exposed to the air for a long time, its surface can be tinned. In order to keep the phases in an insulating state and avoid short-circuit faults caused by the intrusion of foreign objects, each transfer busbar 9 can be covered with a high-voltage heat-shrinkable sleeve.

In addition, in order to meet different business requirements (such as the test requirements of 6MW generators, etc.), the transfer busbar 9 can be a double busbar 10, as shown in Figure 8. The double busbar 10 includes two single busbars that are symmetrical to each other. Each side of the double busbar 10 may include a plurality of through holes 11, and the other side is provided with through holes at positions symmetrical to the plurality of through holes 11. 11 is used to connect with the first converter under test 1 or the second converter under test 2 .

In addition, the output end of the circuit breaker in the first circuit breaker assembly 52 or the second circuit breaker assembly 53 can also be connected to the step-up transformer 6 through the transfer busbar 9, so as to improve the safety of the test device of the converter.

In addition, considering that the test device 5 of the converter will generate a large amount of heat during operation, a heat sink 12 can be provided for the test device 5 of the converter, and the specific processing includes: the test device of the converter also At least one radiator 12 is included, and the radiator 12 is used for cooling the controller 51 , the first circuit breaker assembly 52 , the second circuit breaker assembly 53 and/or the transfer busbar 9 .

Wherein, as shown in FIG. 9 , the radiator 12 may specifically include a cooling fan 121 and a switch 122 .

Specifically, FIG. 9 is a schematic diagram of the control circuit of the heat dissipation system of the test device for the converter of this embodiment. Wherein, the part in the dotted line frame is the radiator 12, which may include a heat dissipation fan 121 and a switch 122 for controlling the normal operation of the heat dissipation fan 121, in order to ensure the safety of the operator, the switch 122 can be selected as a rotary switch . The cooling system including the radiator 12 can be powered by other power sources than the grid-connected power generation system, and other power sources can include but not limited to 220V AC power in daily life.

During the phase loss test and load rejection test, the voltage of a certain phase or multiple phases will be measured, and the measurement circuit can be as shown in Figure 10, through the voltage measurement equipment 13 in the diagram (such as a voltmeter, etc. ) can measure the voltage between any two phases.

The test device for the converter provided by the embodiment of the present invention, on the one hand, connects one winding of the converter to be tested with two circuit breakers, and connects the other winding with a circuit breaker, so that the user can easily convert the current Test the grid-connected circuit of the converter, and control the phase of the connected converter to be tested through the circuit breaker to improve the safety during the switching process of the converter; on the other hand, in order to reduce short-circuit, power failure, etc. In order to prevent adverse effects caused by grid loops, multiple secondary control and protection circuits can be set in the controller. The secondary control and protection circuits can not only control the opening and closing of the circuit breaker, but also protect the grid-connected loop, thereby avoiding manual switching. The risk of electric shock caused by the current transformer can be improved, and the safety during the switching process of the current transformer can be improved. Moreover, the double busbar is used in the test device to connect the equipment to each other, so as to facilitate the interconnection of the equipment and improve the safety. .

Embodiment three

Based on the same technical idea, the embodiment of the present invention also provides an electrical switching cabinet. The electric switching cabinet includes the testing device 5 for the converter provided in the second embodiment.

Wherein, the electric cutting cabinet can include a cabinet body, which can be a cuboid, and its size can be such as 2600 mm long, 2380 mm high, and 1500 mm wide. The cabinet body can be composed of an angle iron welded frame, and the support rod is made of channel steel, and at the same time, channel steel can also be used to fix between the first circuit breaker assembly 52 and the second circuit breaker assembly 53 . There are doors on both sides of the electric upside-down cabinet, three doors on one side, the thickness of the door panel can be 2.0mm, the top is installed with a hanging nut, the bottom can be installed with channel steel, and the thickness of the panel can be 1.5mm.

In the electrical switching cabinet provided by the embodiment of the present invention, the first circuit breaker assembly is connected in series between the grid and the first converter to be tested, and the second circuit breaker is connected in series between the grid and the second converter to be tested. , and then, the controller controls only one of the first circuit breaker assembly and the second circuit breaker assembly to be in the closed state, and the other is in the open state, thereby controlling the interaction between the first converter to be tested and the second converter to be tested Switching is connected to the grid, and at the same time, the test of the grid-connected circuit of the converter can be completed based on the first circuit breaker component or the second circuit breaker component, thereby avoiding the risk of electric shock caused by manual switching of the converter and improving the safety during the switching process of the converter sex.

Further, in the embodiment of the present invention, on the one hand, one winding of the converter to be tested is connected to two circuit breakers, and the other winding is connected to one circuit breaker, so that the user can easily connect the converter to the grid loop test, and control the phase of the connected converter to be tested through the circuit breaker to improve the safety during the switching process of the converter; on the other hand, in order to reduce the short circuit, power failure, etc. Adverse effects, multiple secondary control and protection circuits can be set in the controller, through which the opening and closing of the circuit breaker can be controlled, and the grid-connected circuit can be protected, so as to avoid damage caused by manual switching of the converter. The risk of electric shock can be improved, and the safety during the switching process of the converter can be improved. Moreover, the double busbar is used in the test device to connect the equipment to each other, so as to facilitate the interconnection of the equipment and improve the safety.

Embodiment four

Based on the same technical concept, an embodiment of the present invention also provides a test system, as shown in FIG. 1 or FIG. 2 . The test system includes a first converter to be tested 1, the electrical switching cabinet provided in the third embodiment above, a second converter to be tested 2, a power supply 3 and a power grid 4, wherein: the first converter to be tested 1 and The second converter 2 to be tested is connected in series with the power supply 3 respectively; the electric switching cabinet is respectively connected in series between the first converter 1 to be tested and the grid 4, and between the second converter 2 to be tested and the grid 4, It is used to control the first converter under test 1 and the power source 3 to communicate with the grid 4 or the second converter under test 2 and the power source 3 to communicate with the grid 4 .

Specifically, one-way conduction, two-phase conduction, three-phase conduction and three-phase disconnection can be performed through the closing and opening of the circuit breaker in the first circuit breaker assembly 52 and the second circuit breaker assembly 53 in the electrical switching cabinet Waiting for the test to complete the test on the first converter under test 1 or the second converter under test 2 , the corresponding processing can refer to the relevant content in the second embodiment, and will not be repeated here.

Wherein, the power supply 3 may be a power supply output by a wind power generating set.

In the test system provided by the embodiment of the present invention, the first circuit breaker assembly in the electrical switching cabinet is connected in series between the power grid and the first transformer to be tested, and the second circuit breaker assembly is connected in series between the power grid and the second transformer to be tested. between the current transformers, and then, the controller controls only one of the first circuit breaker assembly and the second circuit breaker assembly to be in the closed state, and the other is in the open state, thereby controlling the first current transformer to be tested and the second circuit breaker to be tested The converters are switched to each other and connected to the power grid. At the same time, the test of the grid-connected circuit of the converter can be completed based on the first circuit breaker component or the second circuit breaker component, thereby avoiding the risk of electric shock caused by manual switching of the converter and improving the efficiency of converter switching. safety in the process.

Further, in the embodiment of the present invention, on the one hand, one winding of the converter to be tested is connected to two circuit breakers, and the other winding is connected to one circuit breaker, so that the user can easily connect the converter to the grid loop test, and control the phase of the connected converter to be tested through the circuit breaker to improve the safety during the switching process of the converter; on the other hand, in order to reduce the short circuit, power failure, etc. Adverse effects, multiple secondary control and protection circuits can be set in the controller, through which the opening and closing of the circuit breaker can be controlled, and the grid-connected circuit can be protected, so as to avoid damage caused by manual switching of the converter. The risk of electric shock can be improved, and the safety during the switching process of the converter can be improved. Moreover, the double busbar is used in the test device to connect the equipment to each other, so as to facilitate the interconnection of the equipment and improve the safety.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (10)

1. a proving installation for current transformer, is characterized in that, comprising:

Controller (51), the first open circuit assembly (52) and the second open circuit assembly (53), wherein:

Described first open circuit assembly (52) is connected between electrical network (4) and the first current transformer to be measured (1), and described second open circuit assembly (53) is connected between electrical network (4) and the second current transformer to be measured (2); Described controller (51) is connected with described first open circuit assembly (52) and described second open circuit assembly (53) respectively, for control in described first open circuit assembly (52), described second open circuit assembly (53) only one of them is in closure state, another is in off-state.

2. proving installation according to claim 1, is characterized in that, described first open circuit assembly (52) comprises the first isolating switch (521), the second isolating switch (522) and the 3rd isolating switch (523), wherein,

Described first isolating switch (521) is connected with two in the first winding of described first current transformer to be measured (1), and described second isolating switch (522) is connected with the residue in the first winding of described first current transformer to be measured (1); Described 3rd isolating switch (523) and being respectively connected in the second winding of described first current transformer to be measured (1).

3. proving installation according to claim 1, is characterized in that, described second open circuit assembly (53) comprises the 4th isolating switch (531), the 5th isolating switch (532) and the 6th isolating switch (533), wherein,

Described 4th isolating switch (531) is connected with two in the first winding of described second current transformer to be measured (2), and described 5th isolating switch (532) is connected with the residue in the first winding of described second current transformer to be measured (2); Described 6th isolating switch (533) and being respectively connected in the second winding of described second current transformer to be measured (2).

4. the proving installation according to any one of claims 1 to 3, is characterized in that, the isolating switch in described first open circuit assembly (52) and described second open circuit assembly (53) comprises at least one input terminal (8); Described controller (51) is made up of multiple linear quadratic control protection circuit (7); the output terminal input terminal corresponding thereto (8) of described linear quadratic control protection circuit (7) connects, for controlling the closed of respective circuit breakers and disconnecting.

5. proving installation according to claim 4, is characterized in that, described proving installation also comprises switching busbar (9), is connected between described first open circuit assembly (52) and described first current transformer to be measured (1); And/or, be connected between described second open circuit assembly (53) and described second current transformer to be measured (2).

6. proving installation according to claim 5, is characterized in that, described switching busbar (9) is Two bors d's oeuveres busbar (10).

7. proving installation according to claim 6, it is characterized in that, described proving installation also comprises at least one heating radiator (12), and described heating radiator (12) is for being the cooling of described controller (51), described first open circuit assembly (52), described second open circuit assembly (53) and/or described switching busbar (9).

8. electrically cut a cabinet, it is characterized in that, comprise the proving installation (5) of the current transformer described in above-mentioned any one of power 1-7.

9. a test macro, is characterized in that, comprises the first current transformer to be measured (1), electrically cuts cabinet, the second current transformer to be measured (2), power supply (3) and electrical network (4) as claimed in claim 8, wherein:

Described first current transformer to be measured (1) is connected with described power supply (3) respectively with described second current transformer to be measured (2); Describedly electrically cut cabinet and be connected between described first current transformer to be measured (1) and described electrical network (4) respectively, and between described second current transformer to be measured (2) and described electrical network (4), to be communicated with described electrical network (4) or described second current transformer to be measured (2) is communicated with described electrical network (4) with described power supply (3) for controlling described first current transformer to be measured (1) and described power supply (3).

10. test macro according to claim 9, is characterized in that, described power supply (3) is the power supply using wind power generating set to export.