System and method for judging secondary side wiring of multiple current transformers

Abstract

The invention discloses a secondary side wiring judgment system and method for multiple current transformers. The system comprises a multi-channel data acquisition module, a data communication module and a judgment module, the multi-channel data acquisition module comprises a plurality of channel data acquisition units; the first channel data acquisition unit comprises a parallel resistor; each channel data acquisition unit acquires a current signal output by the corresponding current transformer; the first channel data acquisition unit is also used for acquiring a specific voltage signal corresponding to the current signal output by the corresponding current transformer; the data communication module sends current signals acquired by the channel data acquisition units and specific voltage signals 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 relation of the plurality of current transformers in a three-phase output loop of the generator set; and the wiring consistency of the secondary sides of the plurality of current transformers is judged according to the relation and the phase relation of the power signals.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of generator testing, and in particular to a system and method for determining secondary side wiring of multiple current transformers. Background Art

[0002] When a generator or a generator set leaves the factory, it is usually equipped with multiple current transformers in the generator output main circuit. 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 determine whether the secondary side wiring methods of the configured multiple current transformers are consistent when the generator or the generator set is tested at the factory. The conventional method of determining whether the secondary side wiring methods of the configured multiple current transformers are consistent is to manually visually check the markings on the current transformer body. However, the markings on the current transformer body are sometimes wrong, and the correctness cannot be guaranteed every time through manual visual inspection. Summary of the invention

[0003] The present invention provides a system and method for judging the secondary side wiring of multiple current transformers, so as to achieve the accuracy of judging the secondary side wiring of multiple current transformers during the generator test process and improve the judgment efficiency.

[0004] To achieve the above objectives, in a first aspect, an embodiment of the present invention provides a system for judging the secondary wiring 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; the system comprises: a multi-channel data acquisition module, a data communication module and a judgment module; the multi-channel data acquisition module comprises multiple channel data acquisition units; each channel data acquisition unit corresponds to each current transformer one by one; the multiple channel data acquisition units comprise: a first channel data acquisition unit and other channel data acquisition units; the first channel data acquisition unit comprises a parallel resistor; the parallel resistor is connected in parallel with the corresponding current transformer;

[0005] The plurality of current transformers are electrically connected to the channel data acquisition units; the channel data acquisition units are communicatively connected to the judgment module through the data communication module; the channel data acquisition units are used to acquire the current signal corresponding to the output of the current transformer; the first channel data acquisition unit is also used to acquire the specific voltage signal corresponding to the current signal output by the 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 based on 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 based on the relationship between the power signals and the phase relationship.

[0007] Optionally, the system also includes: a host computer integrated display module; the host computer integrated 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 signals, 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 current signal and the specific voltage signal, specifically:

[0009] 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;

[0010] 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;

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

[0012] 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;

[0013] 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;

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

[0015] 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.

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

[0017] Optionally, a plurality of the channel data acquisition units are partially integrated in the design.

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

[0019] Each of the channel data acquisition units correspondingly acquires the current signal 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 current mutual inductance;

[0021] 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;

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

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

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

[0025] Optionally, the multiple current transformer secondary side wiring judgment system further includes: a host computer comprehensive display module;

[0026] The method for determining the secondary side connections 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, the judging module determines the phase relationship of the multiple current transformers in the three-phase output circuit of the generator set, including:

[0029] 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;

[0030] Determine 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.

[0031] Optionally, the judgment module determines each power signal according to each current signal and the specific voltage signal, including:

[0032] 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;

[0033] 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;

[0034] 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:

[0035] 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.

[0036] Optionally, before each of the channel data acquisition units correspondingly acquires the current signal output by each of the current transformers, it further includes: performing a short-circuit test on the generator set before leaving the factory.

[0037] In an embodiment of the present invention, each of the channel data acquisition units acquires a current signal corresponding to the output of each of the current transformers; the first channel data acquisition unit also acquires a specific voltage signal corresponding to the current signal output by the current transformer; 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 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 judges the consistency of the secondary side wiring of multiple current transformers according to the relationship between the power signals and the phase relationship, so that during the factory test of the generator, the accuracy of the judgment of the secondary side wiring of multiple current transformers is achieved, and the efficiency of the judgment is improved. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

[0042] Figure 5 It is a flow chart of another method for determining secondary side connections of multiple current transformers provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0043] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0044] Figure 1 is a structural schematic diagram of a system for determining secondary side wiring of multiple current transformers provided by an embodiment of the present invention, such as Figure 1 As shown, the system is applied to the factory test process of the generator set, and multiple current transformers L are set 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] A plurality of current transformers L are electrically connected to each channel data acquisition unit 11; each channel data acquisition unit is communicatively connected to a judgment module 30 via a data communication module 20; each channel data acquisition unit 11 is used to collect a current signal corresponding to the output of each current transformer L; the first channel data acquisition unit 111 is also used to collect a specific voltage signal U0 corresponding to the current signal output by the corresponding current transformer; the data communication module 20 is used to send the current signal output by each channel data acquisition unit 11 and the specific voltage signal U0 output by the first channel data acquisition unit 111 to the judgment module 30;

[0046] The judgment module 30 is used to determine each power signal according to each current signal and the specific voltage signal U0, and is also used to 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 and phase relationship of each power signal.

[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 one of the multiple channel data acquisition units 11; the first channel data acquisition unit 111 serves as a reference channel data acquisition unit, and the first channel data acquisition unit 111 may include a parallel resistor R, so that when the corresponding current transformer is connected to the first channel data acquisition unit 111, due to the effect of the parallel resistor R, the first channel data acquisition unit 111 can collect the current signal of the corresponding current transformer and can also collect the specific voltage signal U0 corresponding to the corresponding current signal; and since the other channel data acquisition units 112 are not connected to the parallel resistor, the other channel data acquisition units 112 can only collect the current signal of the corresponding current transformer.

[0048] The factory test process of the generator is an output current test such as short circuit and loading. Generally, during the factory test of the generator, multiple current transformers are arranged in different phase loops of the three-phase output loop of the generator set. Since the three-phase output loop generated by the generator set is generated under one power supply system, all current transformers are also tested under the same power supply system, so that it can be ensured that the current signals detected by the current transformers arranged in the three-phase output loop have a fixed relationship, and then it is determined that the current signals detected by the current transformers in the three-phase output loop and the power signals determined by the specific voltage signal U0 collected by the first channel data acquisition unit 111 also have a fixed relationship. In addition, if the current transformers are 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 one power supply system, all current transformers are also tested under the same power supply system, then the current signals detected by the current transformers have the same relationship, so as to determine that the current signals detected by the current transformers have the same relationship with the specific voltage signal U0 collected by the first channel data acquisition unit 111. o The determined power signals also have the same relationship;

[0049] This embodiment utilizes the relationship between the power signals to transmit the current signal output by each channel data acquisition unit 11 and the specific voltage signal U output by the first channel data acquisition unit 111 through the data communication module 20. o The determination module 30 determines the 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 wiring of multiple current transformers based on the phase relationship and the relationship between each power signal, so that in the process of factory testing of the generator, the accuracy of the secondary wiring judgment of multiple current transformers is achieved, and the efficiency of the judgment is improved; avoid the problem of unreliable visual inspection, greatly reduce the labor intensity, and improve the efficiency of factory testing of the generator set. .

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

[0051] Optionally, this embodiment further refines 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 wiring of multiple current transformers according to the relationship and phase relationship of each power signal, and continues to refer to Figure 1-2 , a judgment module 30 is used to determine the current signal and the specific voltage signal U o Determine each power signal, specifically: according to the current signal and the specific voltage signal U collected by the first channel data collection unit 111 o Determine the direction of the reference power signal as the positive direction; according to the current signal and specific voltage signal U collected by the data acquisition unit of other channels o Determine the positive and negative nature of each power signal;

[0052] The judgment module 30 is also 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 phase with the first phase;

[0053] The judgment module 30 is also used to judge the consistency of the secondary side wiring of multiple current transformers based on the relationship between the power signals and the phase relationship, specifically: the relationship between the positive and negative of each power signal and the positive direction of the reference power signal determined by the current signal collected by the channel data acquisition unit corresponding to each other current transformer and the specific voltage signal Uo, and the consistency of the secondary side wiring of each current transformer determined based on whether the phase of each other current transformer in the three-phase output circuit of the generator set is the same as the first phase.

[0054] Generally, during the factory inspection of the generator, the magnitude of the current output by each phase in the three-phase output circuit of the generator set is consistent, and the direction of each current satisfies the angle of 120°; when the current transformer corresponding to the first channel data acquisition unit 111 is set at 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 a specific voltage signal corresponding to the corresponding current signal, and the direction of the specific voltage signal U0 is consistent with the current direction; thus, the direction of the power signal determined by the corresponding current signal and the specific voltage signal U0 is the positive direction;

[0055] When the current transformers corresponding to the other channel data acquisition units 112 are arranged in the other two phases of the three-phase output circuit, the current signals output by the other channel data acquisition units 112 and the corresponding current signals acquired by the first channel data acquisition unit 111 are at an angle of 120°; therefore, the current signals output by the other channel data acquisition units 112 and the specific voltage signal U o The determined power signal is consistent with the corresponding current signal direction and the specific voltage signal U collected by the first channel data collection unit 111 o The determined power signal also satisfies a certain angle; usually 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 U0 is opposite (generally negative); and when each current transformer corresponding to the other channel data acquisition unit 112 is also set in a specific phase in the three-phase output circuit, the power signal determined by each current signal output by each current transformer collected by the other channel data acquisition unit 112 and the specific voltage signal is the same as the current signal collected by the first channel data acquisition unit 111 and the specific voltage signal U o The determined power signals have the same direction;

[0056] This embodiment utilizes the specific relationship of the power signal direction, specifically through the current signal and the specific voltage signal U collected by the first channel data collection unit 111 o Determine 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 phase with the first phase, when the current signals and specific voltage signals U collected by the data acquisition units of each channel corresponding to the other current transformers areo The determined power signals are consistent with the positive direction of the reference power signal; then the secondary wiring of each current transformer is consistent; otherwise, when the current signal and specific voltage signal U collected by each channel data acquisition unit corresponding to each other current transformer o If the positive directions of the determined power signals are inconsistent with the reference power signal, 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 specific voltage signals U collected by the data acquisition units of each channel corresponding to the other current transformers o If the positive direction of each determined power signal is opposite to that of the reference power signal, the secondary wiring of each current transformer is consistent. Otherwise, when the current signal and voltage signal determined by the data acquisition unit of each channel corresponding to other current transformers are the same as the positive direction of the reference power signal, the secondary wiring of each current transformer is inconsistent.

[0058] The following is an example of a system for judging the secondary wiring of multiple current transformers including four current transformers; current transformer 1 is used as a reference; current transformer 1 and current transformer 2 are both 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 correspondingly connected to four channel data acquisition units for communication; the four channel data acquisition units correspondingly collect each power signal; since current transformer 1 is used as a 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 consistency results based on 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 consistency results and inconsistency results based on 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] Optional, Figure 3 is a structural schematic diagram of a system for determining secondary side wiring of multiple current transformers provided by an embodiment of the present invention, such as Figure 3As shown, the plurality of first channel data acquisition units 111 are partially integrated. The advantage of partially integrating the plurality of first channel data acquisition units 111 into a plurality of channel data acquisition modules A is that the area of ​​the entire judgment system can be saved.

[0064] Based on the same inventive concept, an embodiment of the present invention further provides a method for determining the secondary side wiring of multiple current transformers, which is applied to the system for determining the secondary side wiring of multiple current transformers described in the above embodiment; Figure 4 1 is a flow chart of a method for determining secondary side wiring of multiple current transformers provided by an embodiment of the present invention; Figure 4 As shown, the method comprises the following steps:

[0065] S110. Each channel data acquisition unit correspondingly acquires the current signal 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 current mutual inductance.

[0067] S130, the data communication module sends 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.

[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] The phase relationship of the multiple current transformers in the three-phase output circuit of the generator set includes that the multiple current transformers are all arranged on the same phase of the three-phase output circuit of the generator set and the 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 loops of the three-phase output loop of the generator set. Since the three-phase output loop generated by the generator set is generated under one power supply system, all current transformers are also tested under the same power supply system, thereby ensuring that the current signals detected by the current transformers arranged in the three-phase output loop have a fixed relationship, and then determining that the current signals detected by the current transformers in the three-phase output loop and the power signals determined by the specific voltage signal U0 collected by the first channel data acquisition unit 111 also have a fixed relationship;

[0071] If the current transformers are 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 one power supply system, all the current transformers are also detected under the same power supply system, and the current signals detected by the current transformers have the same relationship, so as to determine the current signals detected by the current transformers 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] This embodiment utilizes the relationship between 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 between the power signals. In this way, during the factory test of the generator, the accuracy of the judgment of the secondary side wiring of multiple current transformers is achieved and the efficiency of the judgment is improved.

[0074] Optionally, this embodiment further refines and optimizes the above method embodiment. Figure 5 is a flow chart of another method for determining secondary side connections of multiple current transformers provided by an embodiment of the present invention; Figure 5 As shown, the method comprises the following steps:

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

[0076] Among them, the short-circuit test of the generator set before leaving the factory includes: short-circuiting the three-phase output circuit of the generator set with a suitable cable, and applying an excitation voltage to the generator set, so that the three-phase output circuit of the generator set will generate current, and the secondary side of each current transformer connected to the judgment system will generate current; 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 circuit to complete the short-circuit test; when the generator set is short-circuited 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 the short-circuit test of this embodiment, the three-phase output circuit of the generator set is not loaded with any load. In this way, in the process of judging the consistency of the secondary side wiring methods of multiple current transformers, there is no need to consume a large amount of energy, such as diesel, electricity and other energy for actual loading verification, which greatly reduces energy consumption and is beneficial to environmental protection. At the same time, it is easy for testers to operate, avoiding the problem of complicated operation caused by manually connecting the output of the generator set to the load during the load test.

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

[0079] S230, the first channel data acquisition unit acquires a specific voltage signal corresponding to the current signal output by the current mutual inductance.

[0080] S240, the data communication module sends 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.

[0081] S250, the judgment module determines that the direction of the reference power signal is positive according to the current signal and the specific voltage signal collected by the first channel data acquisition unit; and determines the positive and negative of each power signal according to the current signal and the specific voltage signal collected 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 determines whether the phases of other current transformers in the three-phase output circuit of the generator set are the same as the first phase.

[0083] S270, the judgment module determines the relationship between the positive and negative of each power signal and the positive direction of the reference power signal based on the current signals and specific voltage signals collected by the data acquisition units of other channels, and determines whether the secondary side wiring of each current transformer is consistent based on whether the phase of other current transformers in the three-phase output circuit of the generator set is in phase with the first phase.

[0084] Specifically, if the phases of other current transformers in the three-phase output circuit of the generator set are in phase with the first phase, when the current signals collected by the data acquisition units of each channel corresponding to the other current transformers and the power signals determined by the specific voltage signals are consistent with the positive direction of the reference power signal, the secondary side wiring of each current transformer is consistent; otherwise, when the current signals collected by the data acquisition units of each channel corresponding to the other current transformers and the power signals determined by the specific voltage signals are inconsistent with the positive and reverse 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 current signals collected by the channel data acquisition units corresponding to the other current transformers and the power signals determined by the specific voltage signals are opposite to the positive direction of the reference power signal, the secondary side wiring of each current transformer is consistent; otherwise, when the directions of the current signals collected by the channel data acquisition units corresponding to the other current transformers and the power signals determined by the specific voltage signals are the same as the positive direction of the reference power signal, the secondary side wiring of each current transformer is inconsistent. In this way, during the factory short-circuit test of the generator, the accuracy of the judgment of the secondary side wiring of multiple current transformers is achieved, and the efficiency of the judgment 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 and in detail illustrates how the judgment module judges the consistency of the secondary side wiring of multiple current transformers based on the relationship between the power signals and the phase relationship; in addition, 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 comprehensively displays the current signals, specific voltage signals, power signals and judgment result information, so as to facilitate the staff to monitor the judgment results in time.

[0088] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection 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, and may include more other equivalent embodiments without departing from the concept of the present invention, 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 further 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 based on 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 based on the relationship between the power signals and the phase relationship.

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 judgment module is used to determine each power signal 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; The judgment module is further used to judge the phase relationship of the multiple current transformers in the three-phase output circuit of the generator set, specifically: 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 judgment module is further used to judge the consistency of the secondary side wiring of multiple current transformers 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 signals 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.

4. 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.

5. 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.

6. 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 5; 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 judging module judges the phase relationship of the plurality of current transformers in the three-phase output circuit of the generator set; The judgment module judges the consistency of secondary side wiring of multiple current transformers according to the relationship between the power signals and the phase relationship.

7. The method for determining secondary side connections of multiple current transformers according to claim 6, 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.

8. The method for determining secondary side connections of multiple current transformers according to claim 6, characterized in that: The judging module determines the phase relationship of the multiple current transformers in the three-phase output circuit of the generator set, including: 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; Determine 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.

9. The method for determining secondary side connections of multiple current transformers according to claim 8, characterized in that: 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 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.

10. The method for determining secondary side connections of multiple current transformers according to claim 6, 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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