A system and method for judging the secondary side wiring of multiple current transformers

Abstract

The present invention discloses a system and method for judging the secondary side wiring of multiple current transformers. The system includes: a multi-channel data acquisition module, a data communication module and a judgment module; the multi-channel data acquisition module includes multiple channel data acquisition units; the first channel data acquisition unit includes a parallel resistor; each channel data acquisition unit acquires the current signals output by the corresponding current transformers; the first channel data acquisition unit is further configured to acquire a specific voltage signal corresponding to the current signal output by the corresponding current transformer; the data communication module sends the current signals acquired by each channel data acquisition unit and the specific voltage signal acquired by the first channel data acquisition unit to the judgment module; the judgment module determines each power signal according to each current signal and the specific voltage signal, and also judges the phase relationship of multiple current transformers in the three-phase output circuit of the generator set; and judges the consistency of the secondary side wiring of multiple current transformers according to the relationship of each power signal and the phase relationship.

Description

Technical Field

[0001] An embodiment of the present invention relates to the technical field of generator testing, and particularly to a system and method for judging the secondary side wiring of multiple current transformers. Background Art

[0002] For a generator or a generator set, multiple current transformers are usually configured in the main output circuit of the generator when leaving the factory. The secondary side of the current transformer is connected to a third-party instrument or controller to collect the current of the main circuit, so as to complete various tests. Since the current of the main circuit needs to be collected during the test, it is necessary to judge whether the secondary side wiring methods of the multiple configured current transformers are consistent during the factory test of the generator or the generator set. The conventional method for judging whether the secondary side wiring methods of the multiple configured current transformers are consistent is to rely on manual visual inspection of the marks on the current transformer body for judgment. However, the marks on the current transformer body may sometimes be incorrect, and in addition, the correctness cannot be guaranteed every time through the manual visual inspection method. Summary of the Invention

[0003] The present invention provides a system and method for judging the secondary side wiring of multiple current transformers, which realizes the accuracy of judging the secondary side wiring of multiple current transformers and improves the judgment efficiency during the generator testing process.

[0004] To achieve the above object, in a first aspect, an embodiment of the present invention provides a system for judging the secondary side wiring of multiple current transformers, which is applied to the factory test process of a generator set. Multiple current transformers are arranged in the three-phase output circuit of the generator set. The system includes: a multi-channel data acquisition module, a data communication module, and a judgment module. The multi-channel data acquisition module includes multiple channel data acquisition units. Each channel data acquisition unit corresponds to each current transformer one by one. The multiple channel data acquisition units include: a first channel data acquisition unit and other each channel data acquisition unit. The first channel data acquisition unit includes a parallel resistor. The parallel resistor is connected in parallel with the corresponding current transformer.

[0005] The multiple current transformers are electrically connected to each channel data acquisition unit. Each channel data acquisition unit is communicatively connected to the judgment module through the data communication module. Each channel data acquisition unit is used to collect the current signal output by the corresponding current transformer. The first channel data acquisition unit is further used to collect a specific voltage signal corresponding to the current signal output by the corresponding current transformer. The data communication module is used to send the current signal output by each channel data acquisition unit and the specific voltage signal output by the first channel data acquisition unit to the judgment module.

[0006] The judgment module is used to determine each power signal according to each of the current signals and the specific voltage signal, and is also used to judge the phase relationship of multiple current transformers in the three-phase output circuit of the generator set; and judge the consistency of the secondary side wiring of multiple current transformers according to the relationship of each power signal and the phase relationship.

[0007] Optionally, the system further includes: a host computer comprehensive display module; the host computer comprehensive display module is communicatively connected to the judgment module and each of the channel data acquisition units, and is used to comprehensively display each of the current signals, the specific voltage signal, each of the power signals and the judgment result information.

[0008] Optionally, the judgment module is used to determine each power signal according to each of the current signals and the specific voltage signal, specifically:

[0009] Determine the positive direction of the reference power signal according to the current signal collected by the first channel data acquisition unit and the specific voltage signal;

[0010] Determine the positive and negative of each power signal according to the current signals collected by other channel data acquisition units and the specific voltage signal;

[0011] The judgment module is further used to judge the phase relationship of multiple current transformers in the three-phase output circuit of the generator set, specifically:

[0012] Determine the first phase of the current transformer corresponding to the first channel data acquisition unit in the three-phase output circuit of the generator set;

[0013] Judge whether the phases of other current transformers in the three-phase output circuit of the generator set are in phase with the first phase;

[0014] The judgment module is further used to judge the consistency of the secondary side wiring of multiple current transformers according to the relationship of each power signal and the phase relationship, specifically:

[0015] Determine the consistency of the secondary side wiring of each current transformer according to the relationship between the positive and negative of each power signal determined according to the current signals collected by other channel data acquisition units and the specific voltage signal and the positive direction of the reference power signal, and according to whether the phases of other current transformers in the three-phase output circuit of the generator set are in phase with the first phase.

[0016] Optionally, the data communication module includes an RS485 communication unit or a CAN communication unit.

[0017] Optionally, multiple channel data acquisition units are partially integrated in design.

[0018] In a second aspect, an embodiment of the present invention further provides a method for judging the secondary side wiring of multiple current transformers, which is applied to the system for judging the secondary side wiring of multiple current transformers described in the first aspect above; the system includes:

[0019] Each of the channel data acquisition units correspondingly acquires the current signals output by each of the current transformers;

[0020] The first channel data acquisition unit acquires a specific voltage signal corresponding to the current signal output by the corresponding current transformer;

[0021] The data communication module sends the current signals output by each of the channel data acquisition units and the specific voltage signal output by the first channel data acquisition unit to the judgment module;

[0022] The judgment module determines each power signal according to each of the current signals and the specific voltage signal;

[0023] The judgment module judges the phase relationship of multiple current transformers in the three-phase output circuit of the generator set;

[0024] The judgment module judges the consistency of the secondary side wiring of multiple current transformers according to the relationship of each power signal and the phase relationship.

[0025] Optionally, the system for judging the secondary side wiring of multiple current transformers further includes: a host computer comprehensive display module;

[0026] The method for judging the secondary side wiring of multiple current transformers further includes:

[0027] The host computer comprehensive display module comprehensively displays each of the current signals, the specific voltage signal, each of the power signals, and the judgment result information.

[0028] Optionally, when the judgment module determines the phase relationship of multiple current transformers in the three-phase output circuit of the generator set, it includes:

[0029] Determine the first phase of the current transformer corresponding to the first channel data acquisition unit in the three-phase output circuit of the generator set;

[0030] Judge whether the phases of the other current transformers in the three-phase output circuit of the generator set are in the same phase as the first phase.

[0031] Optionally, when the judgment module determines each power signal according to each of the current signals and the specific voltage signal, it includes:

[0032] The determination module determines that the direction of the reference power signal is the positive direction according to the current signal collected by the first channel data acquisition unit and the specific voltage signal;

[0033] The determination module determines the positive and negative polarities of each power signal according to the current signals collected by the other channel data acquisition units and the specific voltage signal;

[0034] The determination module determines the consistency of the secondary side wiring of multiple current transformers according to the relationship between each power signal and the phase relationship, including:

[0035] The determination module determines the consistency of the secondary side wiring of each current transformer according to the relationship between the positive and negative polarities of each power signal determined by the current signals collected by the other channel data acquisition units corresponding to the other current transformers and the specific voltage signal and the positive direction of the reference power signal, and according to whether the phases of the other current transformers in the three-phase output circuit of the generator set are in phase with the first phase.

[0036] Optionally, before each channel data acquisition unit correspondingly collects the current signal output by each current transformer, it further includes: performing a short-circuit test on the generator set during factory production.

[0037] In the embodiment of the present invention, each channel data acquisition unit collects the current signal output by each corresponding current transformer; the first channel data acquisition unit also collects the specific voltage signal corresponding to the current signal output by the corresponding current transformer; the data communication module then sends the current signals output by each channel data acquisition unit and the specific voltage signal output by the first channel data acquisition unit to the determination module; the determination module then determines each power signal according to each current signal and the specific voltage signal, and is also used to judge the phase relationship of multiple current transformers in the three-phase output circuit of the generator set; and determines the consistency of the secondary side wiring of multiple current transformers according to the relationship between each power signal and the phase relationship, so that during the factory test of the generator, the accuracy of judging the secondary side wiring of multiple current transformers is realized, and the efficiency of judgment is improved. Description of the Drawings

[0038] Figure 1 is a schematic structural diagram of a system for judging the secondary side wiring of multiple current transformers provided by an embodiment of the present invention;

[0039] Figure 2 is a schematic structural diagram of another system for judging the secondary side wiring of multiple current transformers provided by an embodiment of the present invention;

[0040] Figure 3It is a schematic structural diagram of another system for judging the secondary side wiring of multiple current transformers provided by an embodiment of the present invention;

[0041] Figure 4 It is a flowchart of a method for judging the secondary side wiring of multiple current transformers provided by an embodiment of the present invention;

[0042] Figure 5 It is a flowchart of another method for judging the secondary side wiring of multiple current transformers provided by an embodiment of the present invention. Detailed implementation manners

[0043] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that for the sake of description, only parts related to the present invention rather than all structures are shown in the drawings.

[0044] Figure 1 It is a schematic structural diagram of a system for judging the secondary side wiring of multiple current transformers provided by an embodiment of the present invention. As Figure 1 shown, this system is applied in the factory test process of a generator set. Multiple current transformers L are arranged in the three-phase output circuit of the generator set. The system includes: a multi-channel data acquisition module 10, a data communication module 20, and a judgment module 30. The multi-channel data acquisition module 10 includes multiple channel data acquisition units 11. Each channel data acquisition unit 11 corresponds to each current transformer L one by one. The multiple channel data acquisition units 11 include a first channel data acquisition unit 111 and other channel data acquisition units 112. The first channel data acquisition unit 111 includes a parallel resistor R. The parallel resistor R is connected in parallel with the corresponding current transformer.

[0045] The multiple current transformers L are electrically connected to each channel data acquisition unit 11. Each channel data acquisition unit is communicatively connected to the judgment module 30 through the data communication module 20. Each channel data acquisition unit 11 is used to collect the current signals output by the corresponding current transformers L. The first channel data acquisition unit 111 is further used to collect a specific voltage signal U corresponding to the current signal output by the corresponding current transformer 0 ; The data communication module 20 is used to send the current signals output by each channel data acquisition unit 11 and the specific voltage signal U 0 output by the first channel data acquisition unit 111 to the judgment module 30;

[0046] The judgment module 30 is used to judge according to each current signal and the specific voltage signal U 0It is also used to determine each power signal and judge the phase relationship of multiple current transformers L in the three-phase output circuit of the generator set; and judge the consistency of the secondary side wiring of multiple current transformers according to the relationship of each power signal and the phase relationship.

[0047] Among them, the data communication module 20 may include an RS485 communication unit or a CAN communication unit; the first-channel data acquisition unit 111 can be selected from any of the multiple-channel data acquisition units 11; the first-channel data acquisition unit 111 serves as a reference-channel data acquisition unit, and a parallel resistor R may be included in the first-channel data acquisition unit 111. In this way, when the corresponding current transformer is connected to the first-channel data acquisition unit 111, due to the effect of the parallel resistor R, on the basis of the first-channel data acquisition unit 111 collecting the current signal of the corresponding current transformer, it can also collect a specific voltage signal U corresponding to the corresponding current signal. 0 ; while for the other each-channel data acquisition units 112, since no parallel resistor is connected, the other each-channel data acquisition units 112 can only collect the current signals of the corresponding current transformers.

[0048] The factory test process of the generator is output current tests such as short circuit and loading; generally, during the factory test of the generator, multiple current transformers are arranged in different phase circuits of the three-phase output circuit of the generator set. Since the three-phase output circuit generated by the generator set is generated under a single power system, all current transformers are also detected under the same power system, so that the current signals detected by each current transformer arranged in the three-phase output circuit have a fixed relationship. Subsequently, it is determined that the current signals detected by each current transformer in the three-phase output circuit and each power signal determined by the specific voltage signal U0 collected by the first-channel data acquisition unit 111 also have a fixed relationship; and when each current transformer is arranged in the same phase output circuit of the three-phase output circuit, since the three-phase output circuit generated by the generator set is generated under a single power system, all current transformers are also detected under the same power system, then the current signals detected by each current transformer have the same relationship, so as to determine that the current signals detected by each current transformer and each power signal determined by the specific voltage signal U o determined also have the same relationship;

[0049] In this embodiment, by using the relationship of each power signal, the data communication module 20 sends the current signals output by each-channel data acquisition unit 11 and the specific voltage signal U o output by the first-channel data acquisition unit 111 to the judgment module 30; the judgment module 30 then judges according to each current signal and the specific voltage signal U oDetermine each power signal and determine the phase relationship of multiple current transformers in the three-phase output circuit of the generator set; in this way, the judgment module 30 can judge the consistency of the secondary-side wiring of multiple current transformers based on the phase relationship and the relationship of each power signal. Thus, during the factory test of the generator, the accuracy of judging the secondary-side wiring of multiple current transformers is achieved, and the judgment efficiency is improved; the problem of unreliable visual inspection by manual is avoided, the labor intensity is greatly reduced, and the efficiency of the factory test of the generator set is improved.

[0050] Optionally, on the basis of the above embodiment, the system is further optimized and refined. Figure 2 It is a schematic structural diagram of another system for judging the secondary-side wiring of multiple current transformers provided by an embodiment of the present invention. As Figure 2 shown, the system further includes: a host computer integrated display module 40; the host computer integrated display module 40 is communicatively connected to the judgment module 30 and each channel data acquisition unit 11, and is used for comprehensively displaying each current signal, a specific voltage signal, each power signal and judgment result information. Among them, the host computer integrated display module 40 comprehensively displays each current signal, a specific voltage signal, each power signal and judgment result information to facilitate the staff to monitor the judgment result in a timely manner.

[0051] Optionally, in this embodiment, how the judgment module 30 judges the phase relationship of multiple current transformers L in the three-phase output circuit of the generator set and how to judge the consistency of the secondary-side wiring of multiple current transformers according to the relationship of each power signal and the phase relationship are refined. Continuing to refer to Figure 1-2 the judgment module 30 is used to determine each power signal according to each current signal and a specific voltage signal U o Specifically: determine the direction of the reference power signal as the positive direction according to the current signal and the specific voltage signal U collected by the first channel data acquisition unit 111 o Determine the positive and negative of each power signal according to the current signals and the specific voltage signal U collected by other channel data acquisition units o

[0052] The judgment module 30 is further used to judge the phase relationship of multiple current transformers in the three-phase output circuit of the generator set. Specifically: determine the first phase of the current transformer corresponding to the first channel data acquisition unit 111 in the three-phase output circuit of the generator set; judge whether the phases of other current transformers in the three-phase output circuit of the generator set are in the same phase as the first phase;

[0053] The determination module 30 is further configured to determine the consistency of the secondary-side wiring of multiple current transformers according to the relationship and phase relationship of each power signal, specifically: according to the relationship between the positive and negative of each power signal determined by the current signals and the specific voltage signal Uo collected by each channel data acquisition unit corresponding to other current transformers and the positive direction of the reference power signal, and according to whether the phases of other current transformers in the three-phase output circuit of the generator set are in phase with the first phase, determine the consistency of the secondary-side wiring of each current transformer.

[0054] Generally, during the factory inspection of the generator, the magnitudes of the currents output by each phase in the three-phase output circuit of the generator set are the same, and the directions of each current satisfy an included angle of 120°; when the current transformer corresponding to the first channel data acquisition unit 111 is set in a specific phase in the three-phase output circuit, due to the effect of the parallel resistor R, the first channel data acquisition unit 111 collects the specific voltage signal corresponding to the corresponding current signal, and the specific voltage signal U 0 has the same direction as the current direction; thus, the direction of the power signal determined by the corresponding current signal and the specific voltage signal U 0 is the positive direction;

[0055] When the current transformers corresponding to other channel data acquisition units 112 are set in the other two phases of the three-phase output circuit, the included angle between the current signals output by the current transformers collected by the other channel data acquisition units 112 and the current signal collected by the first channel data acquisition unit 111 is 120°; therefore, the power signals determined by the current signals output by the current transformers collected by the other channel data acquisition units 112 and the specific voltage signal U o and the direction of the power signal determined by the current signal collected by the first channel data acquisition unit 111 and the specific voltage signal U o also satisfy a certain included angle; usually, it is opposite to the direction of the power signal determined by the current signal collected by the first channel data acquisition unit 111 and the specific voltage signal U 0 (generally the negative direction); when the current transformers corresponding to the other channel data acquisition units 112 are also set in a specific phase in the three-phase output circuit, the power signals determined by the current signals output by the current transformers collected by the other channel data acquisition units 112 and the specific voltage signal are in the same direction as the power signal determined by the current signal collected by the first channel data acquisition unit 111 and the specific voltage signal U o ;

[0056] This embodiment utilizes the specific relationship of the above power signal directions. Specifically, through the current signal collected by the first channel data acquisition unit 111 and the specific voltage signal U oDetermine that the direction of the reference power signal is the positive direction; if the phases of the other current transformers in the three-phase output circuit of the generator set are in the same phase as the first phase, when the current signals and the specific voltage signal U collected by the respective channel data acquisition units corresponding to the other current transformers o The determined power signals are consistent with the positive direction of the reference power signal; then the secondary side wiring of each current transformer is consistent; otherwise, when the current signals and the specific voltage signal U collected by the respective channel data acquisition units corresponding to the other current transformers o The determined power signals are inconsistent with the positive direction of the reference power signal; then the secondary side wiring of each current transformer is inconsistent.

[0057] When the phases of the other current transformers in the three-phase output circuit of the generator set are out of phase with the first phase, if the current signals and the specific voltage signal U collected by the respective channel data acquisition units corresponding to the other current transformers o The determined power signals are opposite to the positive direction of the reference power signal, then the secondary side wiring of each current transformer is consistent. Otherwise, when the determined power signals of the current signals and voltage signals collected by the respective channel data acquisition units corresponding to the other current transformers are the same as the positive direction of the reference power signal, then the secondary side wiring of each current transformer is inconsistent.

[0058] The following takes a system for judging the secondary side wiring of multiple current transformers including four current transformers as an example for illustration; current transformer 1 is the reference; both current transformer 1 and current transformer 2 are arranged on phase A in the three-phase output circuit; current transformer 3 is arranged on phase B in the three-phase output circuit; current transformer 4 is arranged on phase C in the three-phase output circuit; the four current transformers are respectively communicatively connected to four channel data acquisition units; the four channel data acquisition units respectively collect the power signals; since current transformer 1 is the reference, the direction of the power signal collected by the first channel data acquisition unit corresponding to current transformer 1 is the positive direction; Table 1 is a table of judging the consistency result according to the power signals collected by the second to fourth channel data acquisition units corresponding to current transformers 2-4; Table 2 is a table of judging the inconsistent result of the consistency result according to the power signals collected by the second to fourth channel data acquisition units corresponding to current transformers 2-4;

[0059] Table 1:

[0060]

[0061] Table 2:

[0062]

[0063] Optionally, Figure 3 is a structural schematic diagram of a system for judging the secondary side wiring of multiple current transformers provided by an embodiment of the present invention, asFigure 3 As shown, multiple first-channel data acquisition units 111 are partially integrated. Among them, the advantage of partially integrating multiple first-channel data acquisition units 111 into several channel data acquisition modules A is that it can save the area of the entire judgment system.

[0064] Based on the same inventive concept, an embodiment of the present invention also provides a method for judging the secondary-side wiring of multiple current transformers, which is applied to the system for judging the secondary-side wiring of multiple current transformers described in the above embodiment; Figure 4 is a flowchart of a method for judging the secondary-side wiring of multiple current transformers provided by an embodiment of the present invention; as Figure 4 shown, the method includes the following steps:

[0065] S110. Each channel data acquisition unit correspondingly acquires the current signals output by each current transformer.

[0066] S120. The first-channel data acquisition unit acquires a specific voltage signal corresponding to the current signal output by the corresponding current mutual inductance.

[0067] S130. The data communication module sends the current signals output by each channel data acquisition unit and the specific voltage signal output by the first-channel data acquisition unit to the judgment module.

[0068] S140. The judgment module determines each power signal according to each current signal and the specific voltage signal, and judges the phase relationship of multiple current transformers in the three-phase output circuit of the generator set.

[0069] Among them, the phase relationship of multiple current transformers in the three-phase output circuit of the generator set includes that multiple current transformers are all arranged on the same phase of the three-phase output circuit of the generator set and multiple current transformers are arranged on different phases of the three-phase output circuit of the generator set;

[0070] Generally, during the factory test of the generator, multiple current transformers are arranged in different phase circuits of the three-phase output circuit of the generator set. Since the three-phase output circuit generated by the generator set is generated under a power supply system, all current transformers are also detected under the same power supply system, so that the current signals detected by each current transformer arranged in the three-phase output circuit can have a fixed relationship. Subsequently, it is determined that each power signal determined by the current signals detected by each current transformer in the three-phase output circuit and the specific voltage signal U0 acquired by the first-channel data acquisition unit 111 also has a fixed relationship;

[0071] When each current transformer is arranged in the same-phase output loop of the three-phase output loop, since the three-phase output loop generated by the generator set is generated under a single power supply system, and all current transformers are also detected under the same power supply system, the current signals detected by each current transformer have the same relationship, thereby determining the current signals detected by each current transformer and the specific voltage signal U collected by the first-channel data acquisition unit 111 o The determined power signals also have the same relationship.

[0072] S150. The judgment module judges the consistency of the secondary-side wiring of multiple current transformers according to the relationship and phase relationship of each power signal.

[0073] In this embodiment, by using the relationship of power signals, the judgment module can judge the consistency of the secondary-side wiring of multiple current transformers based on the phase relationship and the relationship of each power signal. In this way, during the factory test of the generator, the accuracy of judging the secondary-side wiring of multiple current transformers is achieved, and the judgment efficiency is improved.

[0074] Optionally, this embodiment is further refined and optimized on the basis of the above method embodiment Figure 5 It is a flowchart of another method for judging the secondary-side wiring of multiple current transformers provided by an embodiment of the present invention; as Figure 5 shown, this method includes the following steps:

[0075] S210. Conduct a short-circuit test on the generator set before leaving the factory.

[0076] Among them, conducting a short-circuit test on the generator set before leaving the factory includes: short-circuiting the three-phase output loop of the generator set with a suitable cable and applying an excitation voltage to the generator set. In this way, a current will be generated in the three-phase output loop of the generator set. At this time, a current will be generated on the secondary side of each current transformer connected to this judgment system; the secondary side of the current transformer is connected to a third-party instrument or controller, and the third-party instrument or controller is used to collect the current of the output loop to complete the short-circuit test; during the short-circuit test of the generator set before leaving the factory, the consistency of the secondary-side wiring methods of the configured multiple current transformers will affect the short-circuit test process.

[0077] In this embodiment of the short-circuit test, the method of not loading any load on the three-phase output loop of the generator set is used. In this way, during the process of judging the consistency of the secondary-side wiring methods of multiple current transformers, a large amount of energy such as diesel and electric energy does not need to be consumed for actual load verification, which greatly reduces energy consumption and is beneficial to environmental protection; at the same time, the operation of the tester is simple, avoiding the problem of complex operation caused by manually connecting the output of the generator set to the load during the load test process.

[0078] S220. Each channel data acquisition unit correspondingly acquires the current signals output by each current transformer.

[0079] S230. The first channel data acquisition unit acquires the specific voltage signal corresponding to the current signal output by the corresponding current transformer.

[0080] S240. The data communication module sends the current signals output by each channel data acquisition unit and the specific voltage signal output by the first channel data acquisition unit to the judgment module.

[0081] S250. The judgment module determines that the direction of the reference power signal is the positive direction according to the current signal and the specific voltage signal acquired by the first channel data acquisition unit; and determines the positive and negative of each power signal according to the current signals and the specific voltage signals acquired by the other channel data acquisition units.

[0082] S260. The judgment module determines the first phase of the current transformer corresponding to the first channel data acquisition unit in the three-phase output circuit of the generator set, and judges whether the phases of the other current transformers in the three-phase output circuit of the generator set are in phase with the first phase.

[0083] S270. The judgment module determines the consistency of the secondary side wiring of each current transformer according to the relationship between the positive and negative of each power signal determined by the current signals and the specific voltage signals acquired by the other channel data acquisition units and the positive direction of the reference power signal, and according to whether the phases of the other current transformers in the three-phase output circuit of the generator set are in phase with the first phase.

[0084] Specifically, if the phases of the other current transformers in the three-phase output circuit of the generator set are in phase with the first phase, when the positive and negative of each power signal determined by the current signals and the specific voltage signals acquired by the corresponding channel data acquisition units of the other current transformers are consistent with the positive direction of the reference power signal, the secondary side wiring of each current transformer is consistent; otherwise, when the positive and negative of each power signal determined by the current signals and the specific voltage signals acquired by the corresponding channel data acquisition units of the other current transformers are inconsistent with the positive and negative directions of the reference power signal; then the secondary side wiring of each current transformer is inconsistent;

[0085] If the phases of other current transformers in the three-phase output circuit of the generator set are out of phase with the first phase, when the directions of the power signals determined by the current signals and specific voltage signals collected by the respective channel data acquisition units corresponding to the other current transformers are opposite to the positive direction of the reference power signal, the secondary side wiring of the current transformers is consistent; otherwise, when the directions of the power signals determined by the current signals and specific voltage signals collected by the respective channel data acquisition units corresponding to the other current transformers are the same as the positive direction of the reference power signal, the secondary side wiring of the current transformers is inconsistent. In this way, during the short-circuit test at the time of generator factory shipment, the accuracy of the secondary side wiring judgment of multiple current transformers is achieved, and the judgment efficiency is improved.

[0086] S280. The host computer comprehensive display module comprehensively displays each current signal, specific voltage signal, each power signal, and judgment result information.

[0087] This embodiment specifically details how the judgment module determines the consistency of the secondary side wiring of multiple current transformers according to the relationship and phase relationship of each power signal. Additionally, since the judgment is completed during the short-circuit no-load test, this greatly reduces energy consumption and is beneficial to environmental protection. At the same time, the host computer comprehensive display module also comprehensively displays each current signal, specific voltage signal, each power signal, and judgment result information to facilitate the staff to monitor the judgment result in a timely manner.

[0088] Note that the above is only the preferred embodiment of the present invention and the applied technical principle. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described here. Various obvious changes, re-adjustments, and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, it can also include more other equivalent embodiments, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A system for judging the secondary side connection of multiple current transformers, which is applied to the factory test process of a generator set, wherein multiple current transformers are arranged in the three-phase output circuit of the generator set; characterized in that: include: Multi-channel data acquisition module, data communication module and judgment module; The multi-channel data acquisition module includes a plurality of channel data acquisition units; Each of the channel data acquisition units corresponds to each of the current transformers one by one; The multiple channel data acquisition units include: a first channel data acquisition unit and other channel data acquisition units; the first channel data acquisition unit includes a parallel resistor; the parallel resistor is connected in parallel with the corresponding current transformer; A plurality of current transformers are electrically connected to each of the channel data acquisition units; each of the channel data acquisition units is communicatively connected to the judgment module through the data communication module; each of the channel data acquisition units is used to collect current signals corresponding to the outputs of each of the current transformers; the first channel data acquisition unit is also used to collect specific voltage signals corresponding to the current signals output by the current transformers; the data communication module is used to send the current signals output by each of the channel data acquisition units and the specific voltage signals output by the first channel data acquisition unit to the judgment module; The judgment module is used to determine each power signal according to each current signal and the specific voltage signal, and is also used to judge the phase relationship of multiple current transformers in the three-phase output circuit of the generator set; and judge the consistency of the secondary side wiring of multiple current transformers according to the relationship between the power signals and the phase relationship; Wherein, each power signal is determined according to each current signal and the specific voltage signal, specifically: Determine the direction of the reference power signal as a positive direction according to the current signal collected by the first channel data collection unit and the specific voltage signal; Determine the positive and negative of each power signal according to the current signal collected by the other channel data collection units and the specific voltage signal; Determining the phase relationship of the multiple current transformers in the three-phase output circuit of the generator set is specifically as follows: Determine a first phase of a current transformer corresponding to the first channel data acquisition unit in a three-phase output circuit of the generator set; Determining whether the phases of the other current transformers in the three-phase output circuit of the generator set are in phase with the first phase; The consistency of the secondary side wiring of multiple current transformers is determined according to the relationship between the power signals and the phase relationship, specifically: The relationship between the positive and negative nature of each power signal determined according to the current signal collected by the other channel data acquisition units and the specific voltage signal and the positive direction of the reference power signal, and the consistency of the secondary side wiring of each current transformer determined according to whether the phase of each other current transformer in the three-phase output circuit of the generator set is in phase with the first phase.

2. The system for determining secondary side wiring of multiple current transformers according to claim 1, characterized in that: Also includes: Host computer integrated display module; The host computer integrated display module is communicatively connected with the judgment module and each of the channel data acquisition units, and is used for comprehensively displaying each of the current signals, the specific voltage signals, each of the power signals and the judgment result information.

3. The system for determining secondary side connections of multiple current transformers according to claim 1, characterized in that: The data communication module includes an RS485 communication unit or a CAN communication unit.

4. The system for determining secondary side connections of multiple current transformers according to claim 1, characterized in that: The plurality of channel data acquisition units are partially integrated in design.

5. A method for determining the secondary side wiring of multiple current transformers, applied to the system for determining the secondary side wiring of multiple current transformers as described in any one of claims 1 to 4; characterized in that: include: Each of the channel data acquisition units correspondingly acquires the current signal output by each of the current transformers; The first channel data acquisition unit acquires a specific voltage signal corresponding to the current signal output by the current mutual inductance; The data communication module sends the current signal output by each of the channel data acquisition units and the specific voltage signal output by the first channel data acquisition unit to the judgment module; The judgment module determines each power signal according to each current signal and the specific voltage signal; The determination module determines each power signal according to each current signal and the specific voltage signal, including: The judgment module determines that the direction of the reference power signal is a positive direction according to the current signal collected by the first channel data collection unit and the specific voltage signal; The judgment module determines the positive and negative of each power signal according to the current signal collected by the other channel data collection units and the specific voltage signal; The judging module judges the phase relationship of the plurality of current transformers in the three-phase output circuit of the generator set; Wherein, determining the phase relationship of the multiple current transformers in the three-phase output circuit of the generator set includes: Determine a first phase of a current transformer corresponding to the first channel data acquisition unit in a three-phase output circuit of the generator set; Determining whether the phases of the other current transformers in the three-phase output circuit of the generator set are in phase with the first phase; The judging module judges the consistency of the secondary side wiring of multiple current transformers according to the relationship between the power signals and the phase relationship; The judging module judges the consistency of the secondary side wiring of multiple current transformers according to the relationship between the power signals and the phase relationship, including: The judgment module determines the relationship between the positive and negative nature of each power signal and the positive direction of the reference power signal based on the current signals collected by the channel data acquisition units corresponding to each of the other current transformers and the specific voltage signal, and determines whether the secondary side wiring of each current transformer is consistent based on whether the phase of each of the other current transformers in the three-phase output circuit of the generator set is in phase with the first phase.

6. The method for determining secondary side connections of multiple current transformers according to claim 5, characterized in that: The multiple current transformer secondary side wiring judgment system further includes: a host computer integrated display module; The method for determining the secondary side connections of multiple current transformers further includes: The host computer comprehensive display module comprehensively displays each of the current signals, the specific voltage signal, each of the power signals and the judgment result information.

7. The method for determining secondary side connections of multiple current transformers according to claim 5, characterized in that: Before each of the channel data acquisition units correspondingly acquires the current signal output by each of the current transformers, the method further includes: performing a short-circuit test on the generator set before leaving the factory.

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