CN112782452A - Residual current monitoring system and control method - Google Patents
Residual current monitoring system and control method Download PDFInfo
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- CN112782452A CN112782452A CN202011564130.XA CN202011564130A CN112782452A CN 112782452 A CN112782452 A CN 112782452A CN 202011564130 A CN202011564130 A CN 202011564130A CN 112782452 A CN112782452 A CN 112782452A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
Abstract
The embodiment of the invention discloses a residual current monitoring system and a control method thereof, wherein a power supply system comprises a plurality of power supply loops, and the residual current monitoring system comprises: the system comprises a control module, an acquisition module and a plurality of transformers; the mutual inductor is used for acquiring a loop analog current signal of at least one power supply line in the power supply loop corresponding to the clamp sleeve and outputting the loop analog current signal to the acquisition module; the acquisition module comprises a plurality of acquisition ports, one acquisition port is connected with one transformer, and the acquisition module is used for acquiring loop analog current signals output by the transformers related to the power supply loop, converting the loop analog current signals into loop digital current signals and sending the loop digital current signals to the control module; the control module is used for generating a first residual current waveform according to the loop digital current signal and calculating a residual current effective value of the power supply loop according to the first residual current waveform. The residual current monitoring system provided by the embodiment of the invention can accurately monitor the residual current of the power supply system, and is safe and reliable.
Description
Technical Field
The embodiment of the invention relates to the technical field of electric power safety, in particular to a residual current monitoring system and a control method.
Background
In a low-voltage alternating-current power supply system, current leakage can be caused by damage of a power supply line or grounding of a line head, and residual current is generated, so that equipment is damaged, and personal safety is threatened. In the prior art, the conventional current synthesis mode is adopted to detect the residual current, so that the residual current is inevitably influenced by a system wiring mode, the detection result is inaccurate, and potential safety hazards exist.
Disclosure of Invention
The embodiment of the invention provides a residual current monitoring system and a control method, which aim to solve the problem of inaccurate detection result caused by detecting residual current in a conventional current synthesis mode.
The embodiment of the invention provides a residual current monitoring system, which is used for monitoring residual current of a power supply system, wherein the power supply system comprises a plurality of power supply loops, and the residual current monitoring system comprises: the system comprises a control module, an acquisition module and a plurality of transformers;
the mutual inductor is used for acquiring a loop analog current signal of the at least one power supply line corresponding to the clamp sleeve and outputting the loop analog current signal to the acquisition module;
the acquisition module comprises a plurality of acquisition ports, one acquisition port is connected with one transformer, and the acquisition module is used for acquiring loop analog current signals output by each transformer associated with the power supply loop, converting the loop analog current signals into loop digital current signals and sending the loop digital current signals to the control module;
the control module is electrically connected with the acquisition module and used for generating a first residual current waveform according to the loop digital current signal and calculating a residual current effective value of the power supply loop according to the first residual current waveform.
Furthermore, the acquisition port has a unique port identifier corresponding to the power supply loop;
the control module is used for receiving the loop digital current signals sent by the acquisition ports corresponding to the same power supply loop according to the port identification of the acquisition ports, generating a first residual current waveform through a synchronous current superposition method, and calculating a residual current effective value of the power supply loop according to the first residual current waveform.
Furthermore, the acquisition port has a unique port identifier corresponding to the power supply loop;
the acquisition module is used for receiving a control instruction issued by the control module, determining each target acquisition port according to the control instruction, controlling each mutual inductor correspondingly connected with each target acquisition port to be connected in series, converting the loop analog current signal generated after the mutual inductors are connected in series into the loop digital current signal, and sending the loop digital current signal to the control module, wherein the control instruction comprises a port identifier of the acquisition port;
and the control module is used for generating a second residual current waveform according to the loop digital current signal and calculating the residual current effective value of the power supply loop according to the second residual current waveform.
Further, the power supply system comprises a first power supply loop and a second power supply loop, wherein each power supply loop comprises three phase lines and a loop neutral line;
in the first power supply circuit, a clamp sleeve mode of the mutual inductor and each power supply line comprises any one of the following modes:
1) one of the mutual inductor clamps is sleeved with one of the phase lines, and the other mutual inductor clamp is sleeved with one of the loop neutral lines;
2) one of the mutual inductor clamps is sleeved with three phase lines, and the other mutual inductor clamp is sleeved with one loop neutral line;
3) one transformer is respectively connected with each power supply line clamp sleeve in the loop;
in the second power supply loop, one transformer clamp sleeve comprises three phase lines, and the other transformer clamp sleeve comprises a common loop neutral line;
the first power supply loop is a single power supply loop or a non-zero double power supply loop, and the second power supply loop is a zero-zero double power supply loop.
Further, the power supply system further comprises a system neutral wire, wherein the system neutral wire penetrates through the mutual inductor;
the mutual inductor is used for acquiring a system analog current signal of the system neutral line and outputting the system analog current signal to the acquisition module;
the acquisition module is used for converting the system analog current signal into a system digital current signal and sending the system digital current signal to the control module;
the control module is used for generating a third residual current waveform according to the system digital current signal and calculating a residual current effective value of the power supply system according to the third residual current waveform.
Further, the control module is further configured to send an alarm message when detecting that the effective value of the residual current of the power supply circuit is greater than the first current threshold.
Further, the control module is further configured to cut off the power supply of the target circuit according to a preset first delay time when it is detected that the effective value of the residual current of the power supply circuit is greater than the second current threshold.
Further, the device further comprises a storage module, wherein the storage module is used for storing the first residual current waveform data.
Based on the same inventive concept, an embodiment of the present invention further provides a control method of the residual current monitoring system, where the control method includes:
the mutual inductor collects a loop analog current signal of the at least one power supply line corresponding to the clamp sleeve and outputs the loop analog current signal to the collection module;
the acquisition module acquires the loop analog current signals output by the transformers associated with the power supply loop, converts the loop analog current signals into loop digital current signals and sends the loop digital current signals to the control module;
the control module generates a first residual current waveform according to the loop digital current signal, and calculates a residual current effective value of the power supply loop according to the first residual current waveform.
The residual current monitoring system provided by the embodiment of the invention comprises a control module, an acquisition module and a plurality of transformers; the mutual inductor collects a loop analog current signal of at least one power supply line in a power supply loop corresponding to the clamp sleeve and outputs the loop analog current signal to the collection module; the acquisition module comprises a plurality of acquisition ports, one acquisition port is connected with one transformer, and the acquisition module acquires loop analog current signals output by each transformer associated with the power supply loop, converts the loop analog current signals into loop digital current signals and sends the loop digital current signals to the control module; the control module generates a first residual current waveform according to the loop digital current signal, and calculates a residual current effective value of the power supply loop according to the first residual current waveform. According to the residual current monitoring system and the control method provided by the embodiment of the invention, the loop analog current signal of the power supply loop is acquired through the mutual inductor, the acquisition module converts the loop analog current signal into the loop digital current signal, the control module is utilized to generate the first residual current waveform according to the loop digital current signal, and the effective value of the first residual current waveform is calculated, so that the residual current of the power supply system can be accurately monitored, and the system is safe and reliable.
Drawings
To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description will be given below of the drawings required for the embodiments or the technical solutions in the prior art, and it is obvious that the drawings in the following description, although being some specific embodiments of the present invention, can be extended and extended to other structures and drawings by those skilled in the art according to the basic concepts of the device structure, the driving method and the manufacturing method disclosed and suggested by the various embodiments of the present invention, without making sure that these should be within the scope of the claims of the present invention.
Fig. 1 is a schematic structural diagram of a residual current monitoring system according to an embodiment of the present invention;
fig. 2 is a flowchart of a control method of a residual current monitoring system according to a second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described through embodiments with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the basic idea disclosed and suggested by the embodiments of the present invention, are within the scope of the present invention.
Example one
Fig. 1 is a schematic structural diagram of a residual current monitoring system according to an embodiment of the present invention, where the technical solution of this embodiment is suitable for accurately monitoring a residual current, and the system may be implemented in a software and/or hardware manner.
As shown in fig. 1, the residual current monitoring system provided in this embodiment is configured to monitor a residual current of a power supply system, where the power supply system includes a plurality of power supply loops, and the residual current monitoring system includes: the system comprises a control module 100, an acquisition module 200 and a plurality of transformers 300; the transformer 300 is used for collecting a loop analog current signal of at least one power supply line corresponding to the clamp sleeve and outputting the loop analog current signal to the collection module 200; the acquisition module 200 comprises a plurality of acquisition ports, one acquisition port is connected with one transformer 300, and the acquisition module 200 is used for acquiring loop analog current signals output by each transformer 300 associated with a power supply loop, converting the loop analog current signals into loop digital current signals and sending the loop digital current signals to the control module 100; the control module 100 is electrically connected to the acquisition module 200, and the control module 100 is configured to generate a first residual current waveform according to the loop digital current signal, and calculate a residual current effective value of the power supply loop according to the first residual current waveform.
Referring to fig. 1, the residual current monitoring system provided in this embodiment includes: a control module 100, an acquisition module 200, and a plurality of transformers 300. The power supply system comprises a plurality of power supply loops including a single power supply loop and a double power supply loop, and the number of the single power supply loop and the double power supply loop is not limited. Each power supply loop comprises four power supply lines, namely a loop neutral line and three phase lines, the combined current of the three phase lines is not zero, unbalanced current is generated, and the combined current of the four power supply lines is not zero, and residual current is generated. One transformer 300 clamps at least one supply line of the supply circuits, each supply circuit then being associated with at least one transformer 300. The current generated on the power supply line generates an analog current signal, i.e., a loop analog current signal, on the coil of the transformer 300, and the transformer 300 collects the loop analog current signal of at least one power supply line corresponding to the clamp sleeve and outputs the loop analog current signal to the collection module 200. The acquisition module 200 includes a plurality of acquisition ports, one acquisition port is connected to one transformer 300, and the acquisition module 200 acquires loop analog current signals output by the transformers 300 associated with the power supply loops, converts the loop analog current signals into loop digital current signals, and summarizes and sends the loop digital current signals corresponding to the power supply loops to the control module 100. The control module 100 generates a first residual current waveform according to all the loop digital current signals associated with the same power supply loop, and calculates a root mean square of the first residual current waveform data, thereby obtaining a residual current effective value of the power supply loop.
The association manner of the loop digital current signal and the power supply loop is not limited, for example, the number of the transformers 300 may be used, that is, each transformer 300 has unique identification information, and since the loop analog current signal acquired by the transformer 300 corresponds to its associated power supply loop, the acquisition module 200 converts the loop analog current signal into a loop digital current signal, and then the loop digital current signal is associated with each power supply loop; the acquisition module 200 may include a plurality of output ports, one output port of the acquisition module 200 is correspondingly communicated with one acquisition port of the acquisition module 200, and a loop digital current signal output by the acquisition module 200 may be associated with each power supply loop in a manner of numbering the output ports of the acquisition module 200, that is, each output port of the acquisition module 200 has a unique output identifier, and is packed and sent to the control module 100, and the control module 100 calculates to obtain a first residual current and an effective value thereof of each power supply loop; on this basis, the control module 100 may include a plurality of input ports, one output port of the acquisition module 200 is electrically connected to one input port of the control module 100, and the loop digital current signal output by the acquisition module 200 may be associated with each power supply loop by numbering the input ports of the control module 100, that is, each input port of the control module 100 has a unique input identifier. The association relationship between the power supply circuit and the transformer 300 is not limited, and may be set according to the type of the power supply circuit and the actual situation in the field, for example, for a single power supply circuit, one transformer 300 or two transformers 300 may be associated. The specific manner of generating the first residual current waveform by the control module 100 according to the loop digital current signal is not limited, and all loop digital current signals associated with the power supply loop can be synthesized into one current waveform to accurately reflect the residual current.
According to the residual current monitoring system provided by the embodiment of the invention, the loop analog current signal of the power supply loop is acquired through the mutual inductor, the acquisition module converts the loop analog current signal into the loop digital current signal, the control module is utilized to generate the first residual current waveform according to the loop digital current signal, and the effective value of the first residual current waveform is calculated, so that the residual current of the power supply loop can be accurately monitored, operation and maintenance personnel can conveniently know the running condition of a load in the power supply loop, and the system is safe and reliable.
Optionally, the acquisition port has a unique port identifier corresponding to the power supply loop; the control module 100 is configured to receive, according to the port identifier of the acquisition port, a loop digital current signal sent by each acquisition port corresponding to the same power supply loop, generate a first residual current waveform by a synchronous current superposition method, and calculate a residual current effective value of the power supply loop according to the first residual current waveform.
Referring to fig. 1, the acquisition port of the acquisition module 200 has a unique port identifier corresponding to the power supply loop, for example, two transformers 300 are connected to the current power supply loop, and according to the port identifier of the acquisition port electrically connected to the two transformers 300, the two transformers 300 may correspond to the power supply loop, that is, current data acquired by the transformer 300 connected to the current acquisition port is detection data of the power supply loop. The control module 100 performs synchronous superposition on current signals (loop digital current signals converted by the acquisition module 200) obtained by all the transformers 300 corresponding to the interfaces in the current power supply loop by using a synchronous current superposition method according to the port identification of the acquisition port to obtain a first residual current waveform, and the square root of the first residual current waveform is calculated to obtain the residual current effective value of the power supply loop. In addition, the loop digital current signals corresponding to the three phase lines of the power supply loop are superposed by adopting a synchronous current superposition method, and the effective value of the superposed loop digital current signals is calculated, so that the unbalanced current of the power supply loop can be detected. Conventional current synthesis is vector synthesis, which involves phase, and when the phase is shifted, the detection result is affected. The synchronous current superposition method provided by this embodiment superimposes current waveforms acquired by the plurality of transformers 300 at the same time, that is, superposes above the zero point and below the zero point respectively, and is not affected by phase shift because the phase is not involved and only the waveforms are superposed at the same time, so that the obtained first residual current waveform is accurate and reliable, and the detection accuracy of the residual current monitoring system can be improved.
Optionally, the acquisition port has a unique port identifier corresponding to the power supply loop; the acquisition module 200 is configured to receive a control instruction issued by the control module 100, determine each target acquisition port according to the control instruction, control each transformer 300 correspondingly connected to each target acquisition port to be connected in series, convert a loop analog current signal generated after the transformers 300 are connected in series into a loop digital current signal, and send the loop digital current signal to the control module 100, where the control instruction includes a port identifier of the acquisition port; the control module 100 is configured to generate a second residual current waveform according to the loop digital current signal, and calculate a residual current effective value of the power supply loop according to the second residual current waveform.
Referring to fig. 1, a control module 100 obtains monitoring information, such as a power supply circuit to be monitored and/or a monitoring mode, input by a user through a human-computer interaction interface and the like, and generates a control instruction according to the monitoring information and sends the control instruction to an acquisition module 200. The acquisition module 200 determines each target acquisition port corresponding to the target loop according to the port identifier of the acquisition port included in the control instruction, and may connect the transformers 300 correspondingly connected to each target acquisition port in series in a manner of on-off control or the like, that is, a plurality of loop analog current signals acquired by the transformers 300 are combined into one loop analog current signal. The acquisition module 200 converts the loop analog current signal generated after the mutual inductor 300 is connected in series into a loop digital current signal, and outputs the loop digital current signal to the control module 100. The control module 100 generates a second residual current waveform according to the loop digital current signal, and calculates a root mean square of the second residual current waveform to obtain a residual current effective value of the power supply loop. In addition, by adopting the above method, the transformers 300 corresponding to the three phase lines of the power supply circuit are connected in series, and after the loop analog current signal is converted into the loop digital current signal by the acquisition module 200, the control module 100 generates the second residual current waveform and calculates the effective value thereof, that is, the unbalanced current of the power supply circuit can be detected. According to the embodiment, the second residual current waveform of the target loop is generated in a mode that the mutual inductors 300 correspondingly connected with the target acquisition port are connected in series according to the port identification of the acquisition port, and the method is simple and efficient.
Optionally, the power supply system includes a first power supply loop and a second power supply loop, and each power supply loop includes three phase lines and one loop neutral line; in the first power supply circuit, the clamp method of the transformer 300 and each power supply line includes any one of the following: 1) one transformer 300 is sleeved with one phase line, and the other transformer 300 is sleeved with one loop neutral line; 2) one transformer 300 is sleeved with three phase lines, and the other transformer 300 is sleeved with one loop neutral line; 3) a mutual inductor 300 is respectively sleeved with each power supply line in the loop; in the second power supply loop, one transformer 300 is sleeved with three phase lines, and the other transformer 300 is sleeved with one shared loop neutral line; the first power supply loop is a single power supply loop or a non-zero double power supply loop, and the second power supply loop is a zero-zero double power supply loop.
The power supply loop of the power supply system comprises a single power supply loop and a double power supply loop, the double power supply loop is divided into a common-zero double power supply loop and a non-common-zero double power supply loop according to whether a loop neutral line is shared, and each power supply loop comprises three phase lines and a loop neutral line. When the residual current monitoring system is used for monitoring the residual current of the power supply circuit, the clamp sleeve mode of the mutual inductor 300 and each power supply line needs to be selected according to the actual situation on the spot. Specifically, in the single-feed circuit and the non-zero double-feed circuit (corresponding to two single-feed circuits), the clamp method of the transformer 300 and each power supply line includes any one of the following: 1) each power supply line (three phase lines and one loop neutral line) is sleeved with one transformer 300, so that one single power supply loop is associated with 4 transformers 300, and one nonzero double power supply loop is associated with 8 transformers 300; 2) three phase lines are sleeved in the same transformer 300, and a neutral line of one loop is sleeved in another transformer 300, so that a single power supply loop is associated with 2 transformers 300, and a non-zero double power supply loop is associated with 4 transformers 300; 3) four power supply lines are sleeved into the same transformer 300, so that a single power supply loop is associated with 1 transformer 300, and a non-zero double power supply loop is associated with 2 transformers 300.
In the common-zero double power supply loop, two power supplies supply power for the same load, the two power supplies are standby power supplies, and neutral lines of the two power supplies are connected together, namely the common-zero double power supply loop comprises six phase lines and a common loop neutral line, so that unbalanced current can flow back to the two power supplies through the common loop neutral line in the power supply process, and the current in the common loop neutral line needs to be detected when the residual current of the common-zero double power supply loop is detected. Therefore, in the common-zero dual power supply loop, three phase lines are sleeved in the same transformer 300, and one common-loop neutral line is sleeved in another transformer 300, i.e. one common-zero dual power supply loop is associated with 3 transformers 300.
Optionally, the power supply system further comprises a system neutral, the system neutral passing through the transformer 300; the mutual inductor 300 is used for acquiring a system analog current signal of a system neutral line and outputting the system analog current signal to the acquisition module 200; the acquisition 200 is used for converting the system analog current signal into a system digital current signal and sending the system digital current signal to the control module 100; the control module 100 is configured to generate a third residual current waveform according to the system digital current signal, and calculate a residual current effective value of the power supply system according to the third residual current waveform.
The power supply system also comprises a system neutral line, the system neutral line is a neutral line of the whole power supply system and is equivalent to a bus, and when the system neutral line is grounded in a single point, the current flowing through the system neutral line is the residual current of the whole power supply system, so that the current of a grounding point of the system neutral line only needs to be monitored in real time. Specifically, a system neutral line of the power supply system passes through one transformer 300, a current generated on the system neutral line generates a system analog current signal on a coil of the transformer 300 correspondingly connected, and the transformer 300 collects the system analog current signal and sends the system analog current signal to the collection module 200. The acquisition module 200 acquires the system analog current signal, converts the system analog current signal into a system digital current signal, and outputs the system digital current signal to the control module 100. The control module 100 generates a third residual current waveform according to the system digital current signal, and obtains a residual current effective value of the power supply system by calculating a root mean square of the third residual current waveform data. The current of the system neutral line flowing through the single-point grounding is detected, so that the residual current of the whole power supply system is monitored, the method is simple, and the residual current of the power supply system can be directly reflected.
Optionally, the control module 100 is further configured to send an alarm message when detecting that the effective value of the residual current of the power supply circuit is greater than the first current threshold.
Setting a residual current alarm threshold value of each power supply circuit, namely a first current threshold value, judging a circuit fault when the control module 100 detects that the residual current effective value of the power supply circuit is greater than the first current threshold value, sending alarm information in modes of light alarm, sound alarm, display screen display and the like, and timely notifying operation and maintenance personnel to handle the fault when the fault occurs so as to avoid major power accidents. The first current threshold may be set according to a field condition, and is not limited.
In addition, if there is a demand for monitoring the unbalanced current of the power supply loop, a corresponding unbalanced current alarm threshold may be set according to the actual condition of each power supply loop, and the control module 100 sends an alarm message when detecting that the effective value of the unbalanced current of the power supply loop is greater than the unbalanced current threshold.
Optionally, the control module 100 is further configured to cut off the power supply of the target circuit according to a preset first delay time when it is detected that the effective value of the residual current of the power supply circuit is greater than the second current threshold.
In the process of monitoring residual current, when serious faults occur, a fault loop is cut off in time, the occurrence of electric power accidents is avoided, the actual requirements of field operation are considered, namely, the faults are temporary sometimes, if the fault loop is tripped immediately, the power failure of the fault loop is caused, and unnecessary loss is caused, so that the fault loop can be operated only by delaying a certain time. The method comprises the steps that a corresponding residual current threshold value, namely a second current threshold value, and a trip delay time length, namely a first delay time length are set according to the actual situation of each power supply loop when a serious fault occurs, when the control module 100 detects that the effective value of the residual current of the power supply loop is larger than the second current threshold value, the control module judges that the loop has the serious fault, and at the moment, the control module does not immediately trip, but trips to cut off a power supply source of a target loop according to the preset first delay time length.
Optionally, a storage module 400 is further included, and the storage module 400 is configured to store the first residual current waveform data.
Referring to fig. 1, the residual current monitoring system further includes a storage module 400, and the storage module 400 can record the first residual current waveform data of the power supply circuit in real time, that is, the first residual current waveform and the residual current effective value thereof. When a fault occurs, operation and maintenance personnel can clearly see the process of the whole fault occurrence through residual current waveform data before and after the fault occurs, which is recorded by the storage module 400, so that countermeasures are taken. The memory module 400 may be a separate module or may be integrated in the control module 100.
The residual current monitoring system provided by the embodiment of the invention comprises a control module, an acquisition module and a plurality of transformers; the mutual inductor collects a loop analog current signal of at least one power supply line in a power supply loop corresponding to the clamp sleeve and outputs the loop analog current signal to the collection module; the acquisition module comprises a plurality of acquisition ports, one acquisition port is connected with one transformer, and the acquisition module acquires loop analog current signals output by each transformer associated with the power supply loop, converts the loop analog current signals into loop digital current signals and sends the loop digital current signals to the control module; the control module generates a first residual current waveform according to the loop digital current signal, and calculates a residual current effective value of the power supply loop according to the first residual current waveform. According to the residual current monitoring system provided by the embodiment of the invention, the loop analog current signal of the power supply loop is acquired through the mutual inductor, the acquisition module converts the loop analog current signal into the loop digital current signal, the control module is utilized to generate the first residual current waveform according to the loop digital current signal, and the effective value of the first residual current waveform is calculated, so that the residual current of the power supply system can be accurately monitored, and the residual current monitoring system is safe and reliable.
Example two
Fig. 2 is a flowchart of a control method of a residual current monitoring system according to a second embodiment of the present invention, where the technical solution of this embodiment is suitable for accurately monitoring a residual current, and the method may be executed by the residual current monitoring system according to any embodiment of the present invention, and the system may be implemented by software and/or hardware. The control method comprises the following steps:
s210, the mutual inductor collects a loop analog current signal of at least one power supply line corresponding to the clamp sleeve and outputs the loop analog current signal to a collection module;
s220, the acquisition module acquires loop analog current signals output by transformers related to the power supply loop, converts the loop analog current signals into loop digital current signals and sends the loop digital current signals to the control module;
and S230, the control module generates a first residual current waveform according to the loop digital current signal, and calculates the residual current effective value of the power supply loop according to the first residual current waveform.
The control method of the residual current monitoring system provided by the embodiment of the invention has the corresponding functional modules of the residual current monitoring system provided by any embodiment of the invention.
According to the control method of the residual current monitoring system provided by the embodiment of the invention, a loop analog current signal of at least one power supply line corresponding to a clamp sleeve is acquired through a mutual inductor and is output to an acquisition module; the acquisition module acquires loop analog current signals output by transformers associated with the power supply loop and converts the loop analog current signals into loop digital current signals; the control module is used for generating a first residual current waveform according to the loop digital current signal, and calculating an effective value of the first residual current waveform, so that the residual current of the power supply system can be accurately monitored, and the method is safe and reliable.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (9)
1. A residual current monitoring system for monitoring a residual current of a power supply system, the power supply system comprising a plurality of power supply loops, the residual current monitoring system comprising: the system comprises a control module, an acquisition module and a plurality of transformers;
the mutual inductor is used for acquiring a loop analog current signal of the at least one power supply line corresponding to the clamp sleeve and outputting the loop analog current signal to the acquisition module;
the acquisition module comprises a plurality of acquisition ports, one acquisition port is connected with one transformer, and the acquisition module is used for acquiring loop analog current signals output by each transformer associated with the power supply loop, converting the loop analog current signals into loop digital current signals and sending the loop digital current signals to the control module;
the control module is electrically connected with the acquisition module and used for generating a first residual current waveform according to the loop digital current signal and calculating a residual current effective value of the power supply loop according to the first residual current waveform.
2. The residual current monitoring system according to claim 1, wherein the collection port has a unique port identification corresponding to the power supply loop;
the control module is used for receiving the loop digital current signals sent by the acquisition ports corresponding to the same power supply loop according to the port identification of the acquisition ports, generating a first residual current waveform through a synchronous current superposition method, and calculating a residual current effective value of the power supply loop according to the first residual current waveform.
3. The residual current monitoring system according to claim 1, wherein the collection port has a unique port identification corresponding to the power supply loop;
the acquisition module is used for receiving a control instruction issued by the control module, determining each target acquisition port according to the control instruction, controlling each mutual inductor correspondingly connected with each target acquisition port to be connected in series, converting the loop analog current signal generated after the mutual inductors are connected in series into the loop digital current signal, and sending the loop digital current signal to the control module, wherein the control instruction comprises a port identifier of the acquisition port;
and the control module is used for generating a second residual current waveform according to the loop digital current signal and calculating the residual current effective value of the power supply loop according to the second residual current waveform.
4. The residual current monitoring system according to claim 1, wherein said power supply system comprises a first power supply circuit and a second power supply circuit, each of said power supply circuits comprising three phase lines and one circuit neutral line;
in the first power supply circuit, a clamp sleeve mode of the mutual inductor and each power supply line comprises any one of the following modes:
1) one of the mutual inductor clamps is sleeved with one of the phase lines, and the other mutual inductor clamp is sleeved with one of the loop neutral lines;
2) one of the mutual inductor clamps is sleeved with three phase lines, and the other mutual inductor clamp is sleeved with one loop neutral line;
3) one transformer is respectively connected with each power supply line clamp sleeve in the loop;
in the second power supply loop, one transformer clamp sleeve comprises three phase lines, and the other transformer clamp sleeve comprises a common loop neutral line;
the first power supply loop is a single power supply loop or a non-zero double power supply loop, and the second power supply loop is a zero-zero double power supply loop.
5. The residual current monitoring system according to claim 1, wherein the power supply system further comprises a system neutral, the system neutral passing through the transformer;
the mutual inductor is used for acquiring a system analog current signal of the system neutral line and outputting the system analog current signal to the acquisition module;
the acquisition module is used for converting the system analog current signal into a system digital current signal and sending the system digital current signal to the control module;
the control module is used for generating a third residual current waveform according to the system digital current signal and calculating a residual current effective value of the power supply system according to the third residual current waveform.
6. The residual current monitoring system according to claim 1, wherein the control module is further configured to send an alarm message when detecting that the effective value of the residual current of the power supply circuit is greater than the first current threshold.
7. The residual current monitoring system according to claim 6, wherein the control module is further configured to cut off the power supply of the target circuit according to a preset first delay time when detecting that the effective value of the residual current of the power supply circuit is greater than the second current threshold.
8. The residual current monitoring system according to claim 1, further comprising a storage module for storing the first residual current waveform data.
9. A method of controlling a residual current monitoring system according to any one of claims 1 to 8, the method comprising:
the mutual inductor collects a loop analog current signal of the at least one power supply line corresponding to the clamp sleeve and outputs the loop analog current signal to the collection module;
the acquisition module acquires the loop analog current signals output by the transformers associated with the power supply loop, converts the loop analog current signals into loop digital current signals and sends the loop digital current signals to the control module;
the control module generates a first residual current waveform according to the loop digital current signal, and calculates a residual current effective value of the power supply loop according to the first residual current waveform.
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