CN109143114B - Direct current mutual crossing fault detection device and method - Google Patents
Direct current mutual crossing fault detection device and method Download PDFInfo
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- CN109143114B CN109143114B CN201810861658.XA CN201810861658A CN109143114B CN 109143114 B CN109143114 B CN 109143114B CN 201810861658 A CN201810861658 A CN 201810861658A CN 109143114 B CN109143114 B CN 109143114B
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Abstract
The embodiment of the invention provides a direct current mutual crossing fault detection device and method, and relates to the technical field of fault detection. This direct current fault detection device that scurries each other includes first generating line, second generating line, scurries detection bridge each other, first switch, second switch and host computer, and wherein, scurries the both ends of detection bridge each other and is connected with the positive pole of first generating line, the negative pole electricity of first generating line respectively, and first switch and second switch are established ties between the positive pole of second generating line and the negative pole of second generating line, scurries detection bridge each other including the detection node, and the detection node is connected with first switch and the equal electricity of second switch. The direct current mutual crossing fault detection device and method provided by the invention have the advantages of realizing accurate and effective detection, improving the stable reliability of a direct current system and reducing the workload of workers.
Description
Technical Field
The invention relates to the technical field of fault detection, in particular to a direct current mutual crossing fault detection device and method.
Background
The direct-current power supply system of the transformer substation is an important component of the power supply system for the transformer substation, is equivalent to the heart of the transformer substation, guarantees the supply of operating power supplies of signal, control, relay protection, emergency lighting and the like of the transformer substation, and generally the transformer substation system with the importance of 110KV and 220KV adopts a two-charging two-power mode (two groups of chargers and two groups of storage batteries) to form two sections of independent direct-current power supply systems in order to improve the safety and reliability of direct-current power supply; however, for some reasons, the two dc systems may cross each other, and there is an electrical connection between the two dc systems, that is, a ring network failure is often said.
The direct current mutual crossing problem is a fault problem in the operation of a transformer substation, and greatly influences the stability and reliability of the operation of the whole power system, the direct current mutual crossing problem of the direct current system can cause serious harm, when two sections of direct current systems cross each other, two sections of storage batteries run in parallel, huge current can be generated, a heating condition can occur, and even a fire can be generated; meanwhile, the service life of the storage battery is also reduced; some malfunction of the operating power supply may be caused. In addition, the existing insulation monitoring device in the current market does not have a direct current mutual crossing detection function, and the direct current mutual crossing cannot be effectively detected.
In view of the above, how to solve the above problems is the focus of attention of those skilled in the art.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a dc cross fault detection apparatus, so as to solve the problem that the dc cross cannot be effectively detected in the prior art.
Another objective of the present invention is to provide a method for detecting a dc cross-talk fault, so as to solve the problem that the prior art cannot effectively detect the dc cross-talk.
In order to achieve the above purpose, the embodiment of the present invention adopts the following technical solutions:
in one aspect, an embodiment of the present invention provides a dc cross-over fault detection device, where the dc cross-over fault detection device includes a first bus, a second bus, a cross-over detection bridge, a first switch, a second switch, and a host, where two ends of the cross-over detection bridge are electrically connected to an anode of the first bus and a cathode of the first bus, respectively, the first switch and the second switch are connected in series between an anode of the second bus and a cathode of the second bus, the cross-over detection bridge includes a detection node, the detection node is electrically connected to both the first switch and the second switch, the host is configured to obtain a first voltage of the anode of the first bus when the first switch is turned on and the second switch is turned off, a second voltage of the cathode of the first bus and a third voltage of the detection node, and the host is further configured to obtain a fourth voltage of the anode of the first bus when the first switch is turned off and the second switch is turned off And establishing an equivalent equation according to the first voltage, the second voltage, the third voltage or the fourth voltage, the fifth voltage and the sixth voltage to obtain a resistance value of an equivalent resistor between the first bus and the second bus, and determining whether the first bus and the second bus have a direct current cross fault according to the resistance value of the equivalent resistor and a preset resistance value.
Further, the host is further configured to determine a type of the dc cross fault according to the positive and negative of the third voltage and the sixth voltage after receiving the third voltage and the sixth voltage, and establish an equivalent equation according to the type of the dc cross fault and the first voltage, the second voltage, and the third voltage or the fourth voltage, the fifth voltage, and the sixth voltage.
Further, the host is configured to determine that the type of the dc cross fault is a first fault type when the third voltage is positive and the sixth voltage is negative, and establish the equivalent equation according to the first fault type, the first voltage, the second voltage, and the third voltage; the host is further configured to determine that the type of the dc cross-talk fault is a second fault type when the third voltage is negative and the sixth voltage is negative, and establish the equivalent equation according to the second fault type and the first voltage, the second voltage, and the third voltage; the host is further configured to determine that the type of the dc cross-talk fault is a third fault type when the third voltage is negative and the sixth voltage is positive, and establish the equivalent equation according to the third fault type, the fourth voltage, the fifth voltage, and the sixth voltage; the host is further configured to determine that the type of the dc cross-talk fault is a fourth fault type when the third voltage is positive and the sixth voltage is positive, and establish the equivalent equation according to the fourth fault type, the fourth voltage, the fifth voltage, and the sixth voltage.
Further, the first bus and the second bus both include a plurality of branch lines, the dc cross fault detection device further includes a plurality of hall sensors, each hall sensor is mounted on one of the branch lines, the hall sensors are configured to detect a leakage current of the branch line at which the hall sensor is located, and send the leakage current to the host, and the host is further configured to receive the leakage current transmitted by the hall sensor on the corresponding branch line according to the type of the dc cross fault after it is determined that the dc cross fault occurs in the first bus and the second bus, and determine the branch line in which the dc cross fault occurs according to the leakage current and a preset current.
Furthermore, the direct current mutual crossing fault detection device further comprises a first balance bridge, a second balance bridge and a third switch, wherein two ends of the first balance bridge are respectively and electrically connected with the anode and the cathode of the first bus, two ends of the second balance bridge are respectively and electrically connected with the anode and the cathode of the second bus, and the middle position of the second balance bridge is grounded through the third switch.
Further, the cross detection bridge comprises a first resistor and a second resistor, the first resistor and the second resistor are connected in series between the anode of the first bus and the cathode of the first bus, and the detection node position is the connection position of the first resistor and the second resistor.
On the other hand, an embodiment of the present invention further provides a dc cross-over fault detection method, which is applied to a host of a dc cross-over fault detection device, where the dc cross-over fault detection device further includes a first bus, a second bus, a cross-over detection bridge, a first switch, and a second switch, two ends of the cross-over detection bridge are respectively electrically connected to an anode of the first bus and a cathode of the first bus, the first switch and the second switch are connected in series between the anode of the second bus and the cathode of the second bus, the cross-over detection bridge includes a detection node, and the detection node is electrically connected to both the first switch and the second switch, and the dc cross-over fault detection method includes:
controlling the first switch to be closed and the second switch to be opened, and acquiring a first voltage of the anode of the first bus, a second voltage of the cathode of the first bus and a third voltage of the middle position of the mutual-fleeing detection bridge in the current state;
controlling the first switch to be switched off and the second switch to be switched on, and acquiring a fourth voltage of the anode of the first bus, a fifth voltage of the cathode of the first bus and a sixth voltage of the middle position of the mutual crossing detection bridge in the current state;
establishing an equivalent equation according to the first voltage, the second voltage, the third voltage or the fourth voltage, the fifth voltage and the sixth voltage;
obtaining the resistance value of the equivalent resistor between the first bus and the second bus according to the equivalent equation;
and when the resistance value of the equivalent resistor is smaller than or equal to a preset resistance value, determining that the first bus and the second bus have a direct current mutual crossing fault.
Further, the step of establishing an equivalent equation according to the first voltage, the second voltage, and the third voltage or the fourth voltage, the fifth voltage, and the sixth voltage includes:
determining the type of the direct current cross fault according to the positive and negative of the third voltage and the sixth voltage;
establishing an equivalent equation according to the type of the direct current cross-talk fault and the first voltage, the second voltage, the third voltage, the fourth voltage, the fifth voltage, and the sixth voltage.
Further, the step of determining the type of the dc cross-over fault according to the positive and negative of the third voltage and the sixth voltage includes:
when the third voltage is positive and the sixth voltage is negative, determining that the type of the direct current cross-over fault is a first fault type;
the step of establishing an equivalent equation according to the type of the dc cross-talk fault and the first voltage, the second voltage, and the third voltage or the fourth voltage, the fifth voltage, and the sixth voltage includes:
establishing the equivalent equation according to the first fault type and the first voltage, the second voltage and the third voltage.
Further, the first bus and the second bus each include a plurality of branches, the flow cross-over fault detection device further includes a plurality of hall sensors, each hall sensor is mounted on one of the branches, and the direct-current cross-over fault detection method further includes:
receiving leakage current transmitted by Hall sensors on corresponding branch lines according to the type of the direct current cross fault;
and when the leakage current of the branch line is greater than or equal to the preset current, determining the branch line as the branch line with the direct current cross fault.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a direct-current mutual-fleeing fault detection device and a method, wherein the direct-current mutual-fleeing fault detection device comprises a first bus, a second bus, a mutual-fleeing detection bridge, a first switch, a second switch and a host, wherein two ends of the mutual-fleeing detection bridge are respectively and electrically connected with the anode of the first bus and the cathode of the first bus, the first switch and the second switch are connected between the anode of the second bus and the cathode of the second bus in series, the mutual-fleeing detection bridge comprises a detection node, and the detection node is electrically connected with the first switch and the second switch. The host is used for acquiring a first voltage of the anode of the first bus, a second voltage of the cathode of the first bus and a third voltage of the detection node when the first switch is closed and the second switch is opened. The host is also used for acquiring a fourth voltage of the anode of the first bus, a fifth voltage of the cathode of the first bus and a sixth voltage of the detection node when the first switch is switched off and the second switch is switched off, establishing an equivalent equation according to the first voltage, the second voltage, the third voltage or the fourth voltage, the fifth voltage and the sixth voltage, so as to obtain the resistance value of the equivalent resistor between the first bus and the second bus, and determining whether the first bus and the second bus have a direct current cross fault according to the resistance value of the equivalent resistor and a preset resistance value. On one hand, the method can determine the resistance value of the equivalent resistor between the first bus and the second bus by establishing an equivalent equation, and can determine whether the first bus and the second bus have the direct current mutual crossing fault or not according to the resistance value of the equivalent resistor and the preset resistance value, so that accurate and effective detection is realized, and the stability and the reliability of a direct current system are improved. On the other hand, the direct current cross detection device provided by the invention can realize automatic detection by using the host, and does not need manual detection by workers, thereby reducing the workload of the workers.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 shows a schematic circuit diagram of a dc cross-talk fault detection apparatus provided by an embodiment of the present invention.
Fig. 2 shows an equivalent circuit diagram of a first fault type provided by an embodiment of the present invention.
Fig. 3 shows an equivalent circuit diagram of a second fault type provided by an embodiment of the present invention.
Fig. 4 shows an equivalent circuit diagram of a third fault type provided by an embodiment of the present invention.
Fig. 5 shows an equivalent circuit diagram of a fourth fault type provided by the present invention.
Fig. 6 shows a flowchart of a dc cross-talk fault detection method provided by the present invention.
Icon: 100-direct current cross-over fault detection device; 110 — a first bus; 120-a second bus bar; 130-cross detection bridge; 131-a first resistance; 132-a second resistance; 140-a first switch; 150-a second switch; 160-hall sensor; 170-even a balance bridge; 180-a second balance bridge; 190-third switch.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the 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. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present invention, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. Some embodiments of the invention are described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
Referring to fig. 1, an embodiment of the present invention provides a dc cross-over fault detection apparatus 100, where the dc cross-over fault detection apparatus 100 includes a first bus 110, a second bus 120, a cross-over detection bridge 130, a first switch 140, a second switch 150, and a host, where two ends of the cross-over detection bridge 130 are electrically connected to an anode of the first bus 110 and a cathode of the first bus 110, respectively, the first switch 140 and the second switch 150 are connected in series between the anode of the second bus 120 and the cathode of the second bus 120, the cross-over detection bridge 130 includes a detection node, and the detection node is electrically connected to both the first switch 140 and the second switch 150.
In this embodiment, the host includes a controller, a computer, and other devices having a processing function, and the measurement performed by the cross detection bridge 130 can reduce the interference and influence of the cross detection itself on the dc system.
Further, in some other embodiments, the first bus 110 and the second bus 120 may be controlled by a first slave and a second slave, respectively, and both the first slave and the second slave are communicatively connected with the master for communication. Meanwhile, in the embodiment, the voltage sensor is used to measure the voltage and send the voltage to the host, or the voltage is sent to the host through the first slave and the second slave, which is not limited in this embodiment.
In this embodiment, the host is configured to obtain a first voltage of the positive electrode of the first bus 110, a second voltage of the negative electrode of the first bus 110, and a third voltage of the detection node when the first switch 140 is turned on and the second switch 150 is turned off, and further obtain a fourth voltage of the positive electrode of the first bus 110, a fifth voltage of the negative electrode of the first bus 110, and a sixth voltage of the detection node when the first switch 140 is turned off and the second switch 150 is turned on, and establish an equivalent equation according to the first voltage, the second voltage, the third voltage, or the fourth voltage, the fifth voltage, and the sixth voltage to obtain a resistance value of an equivalent resistor between the first bus 110 and the second bus 120, and determine whether a dc cross-over fault occurs between the first bus 110 and the second bus 120 according to the resistance value of the equivalent resistor and a preset resistance value.
Further, in this embodiment, the cross detection bridge 130 includes a first resistor 131 and a second resistor 132, the first resistor 131 and the second resistor 132 are connected in series between the positive electrode of the first bus 110 and the negative electrode of the first bus 110, and the detection node is a connection point of the first resistor 131 and the second resistor 132. Of course, in some other embodiments, the cross detection tap may also include more resistors, which is not limited in this embodiment.
Specifically, in this embodiment, in order to more quickly determine whether the dc cross fault occurs in the first bus 110 and the second bus 120, the host determines the type of the dc cross fault according to the positive and negative of the detection node, and establishes an equivalent equation according to the type of the dc cross fault.
The following is a detailed description:
the types of the direct current cross-over fault of the present embodiment include a first fault type, a second fault type, a third fault type, and a fourth fault type, where in the present embodiment, the first fault type is a positive-positive cross-over fault, that is, a cross-over fault occurs between a positive electrode of the first bus 110 and a positive electrode of the second bus 120; a second fault type negative-positive cross-over type, that is, a cross-over fault occurs between the negative electrode of the first bus bar 110 and the positive electrode of the second bus bar 120; a third fault type negative-negative electrode cross-over type, that is, a cross-over fault occurs between the negative electrode of the first bus bar 110 and the negative electrode of the second bus bar 120; the fourth fault type is a positive-negative cross-over type, i.e., a cross-over fault occurs between the positive electrode of the first bus bar 110 and the negative electrode of the second bus bar 120.
After the host receives the third voltage and the sixth voltage, determining the type of the direct current cross fault according to the positive and negative of the third voltage and the sixth voltage, wherein the judging method comprises the following steps: when the third voltage is positive and the sixth voltage is negative, determining that the type of the direct current cross fault is a first fault type; when the third voltage is negative and the sixth voltage is negative, determining that the type of the direct current cross fault is a second fault type; when the third voltage is negative and the sixth voltage is positive, determining that the type of the direct current cross fault is a third fault type; when the third voltage is positive and the sixth voltage is positive, the type of the direct-current cross-talk fault is determined to be a fourth fault type. Meanwhile, the host establishes an equivalent equation according to the type of the direct current cross fault, the first voltage, the second voltage, the third voltage or the fourth voltage, the fifth voltage and the sixth voltage.
Specifically, in the present embodiment, for the first fault type, the equivalent circuit is as shown in fig. 2, and according to the equivalent circuit, an equivalent equation can be established
I3 is I1+ I2, where Rx is the equivalent resistance between the first bus 110 and the second bus 120, Ua is the first voltage, Ub is the second voltage, U0 is the third voltage, R1 is the first resistor 131, and R2 is the second resistor 132. The first voltage, the second voltage, and the third voltage can be measured by the voltage sensor, so that the resistance value of the equivalent resistor can be calculated. Further, a resistance value is prestored in the host, and the resistance value is the resistance value of the equivalent resistor between the first bus 110 and the second bus 120 when the two buses are in normal operation. When the calculated resistance value of the equivalent resistor is smaller than or equal to the preset resistance value, the existence of loop cross in the current system can be judged, and the type of the loop cross is a positive-positive pole cross type.
For the second fault type, the equivalent circuit is shown in fig. 3, and according to the equivalent circuit, an equivalent equation can be established
I1 is I2+ I3, where Rx is the equivalent resistance between the first bus 110 and the second bus 120, Ua is the first voltage, Ub is the second voltage, U0 is the third voltage, R1 is the first resistance 131, and R2 is the second resistance 132, and the first voltage, the second voltage, and the third voltage can all be measured by voltage sensors, so the resistance value of the equivalent resistance can be calculated. Further, a resistance value is prestored in the host, and the resistance value is the resistance value of the equivalent resistor between the first bus 110 and the second bus 120 when the two buses are in normal operation. When the calculated resistance value of the equivalent resistor is smaller than or equal to the preset resistance value, the existence of loop cross in the current system can be judged, and the type of the loop cross is a negative-positive cross type.
For the third failure type, the equivalent circuit is shown in fig. 4, and according to the equivalent circuit, an equivalent equation can be established
I1 is I2+ I3, where Rx is the equivalent resistance between the first bus 110 and the second bus 120, Um is the first voltage, Un is the second voltage, U1 is the third voltage, R1 is the first resistance 131, and R2 is the second resistance 132. Further, a resistance value is prestored in the host, and the resistance value is the resistance value of the equivalent resistor between the first bus 110 and the second bus 120 when the two buses are in normal operation. When the calculated resistance value of the equivalent resistor is smaller than or equal to the preset resistance value, the existence of loop cross in the current system can be judged, and the type of the loop cross is a negative-negative pole cross type.
For the fourth fault type, the equivalent circuit is shown in fig. 5, and according to the equivalent circuit, an equivalent equation can be established
I3 is I1+ I2, where Rx is the equivalent resistance between the first bus 110 and the second bus 120, Um is the first voltage, Un is the second voltage, U1 is the third voltage, R1 is the first resistance 131, and R2 is the second resistance 132. Further, a resistance value is prestored in the host, and the resistance value is the resistance value of the equivalent resistor between the first bus 110 and the second bus 120 when the two buses are in normal operation. When the calculated resistance value of the equivalent resistor is smaller than or equal to the preset resistance value, the existence of loop cross in the current system can be judged, and the type of the loop cross is a positive-negative pole cross type.
Further, after the fault that the direct current cross between the first bus bar 110 and the second bus bar 120 occurs is determined, since the first bus bar 110 and the second bus bar 120 both include a plurality of branch lines, a specific branch line that the direct current cross between the fault occurs needs to be determined in order to facilitate maintenance by a maintenance worker.
In view of this, in the present embodiment, the dc cross-talk fault detection apparatus 100 further includes a plurality of hall sensors 160, each hall sensor 160 is installed on one branch line, and the hall sensors 160 are configured to detect a leakage current of the branch line and transmit the leakage current to the host, or transmit the leakage current to the host through the first slave and the second slave. The host is further configured to receive a leakage current transmitted by the hall sensor 160 on the corresponding branch line according to the type of the dc cross-over fault after it is determined that the dc cross-over fault occurs in the first bus 110 and the second bus 120, and determine the branch line where the dc cross-over fault occurs according to the leakage current and a preset current.
For example, when a fault of the positive-negative pole cross type occurs, the hall sensors 160 on all the branches of the positive poles of the first bus bar 110 operate to detect a leakage current, and at the same time, the hall sensors 160 on all the branches of the negative poles of the first bus bar 110 do not operate; the hall sensors 160 on all the branches of the negative electrode of the second bus bar 120 operate to detect the leakage current, and meanwhile, the hall sensors 160 on all the branches of the positive electrode of the second bus bar 120 do not operate, so that the data processing amount is reduced, and the processing efficiency is improved. Of course, in some other embodiments, the leakage current on all the branches on the bus bar may also be detected, which is not limited in this embodiment.
After obtaining the leakage current on the branch circuit, the host can judge whether the leakage current is larger than or equal to the set current, if so, the branch circuit is judged to be the branch circuit with the direct current mutual crossing fault.
Meanwhile, it should be noted that, in order to avoid the influence of other two-segment buses, in this embodiment, the dc cross-over fault detection apparatus 100 further includes a first balance bridge, a second balance bridge 180, and a third switch 190, two ends of the first balance bridge are respectively electrically connected to the positive electrode and the negative electrode of the first bus 110, two ends of the second balance bridge 180 are respectively electrically connected to the positive electrode and the negative electrode of the second bus 120, and the middle position of the second balance bridge 180 is grounded through the third switch 190. When the voltage is detected, the third switch 190 may be turned off, thereby blocking interference of the other two-segment bus.
It should be noted that when it is detected that the current system has a cross warning, the detection process is triggered all the time and uploaded to the background to notify the maintenance personnel until the loop is released or the detection is stopped manually. In addition, the direct-current mutual-crossing fault detection device 100 provided by the embodiment of the invention not only can accurately calculate the mutual-crossing resistance value, but also can judge the mutual-crossing type, select the mutual-crossing feeder line branch, and facilitate maintenance by maintenance personnel.
Second embodiment
Referring to fig. 6, an embodiment of the present invention further provides a method for detecting a dc cross-talk fault, which is applied to a host of the dc cross-talk fault detection apparatus 100 according to the first embodiment,
the direct current mutual crossing fault detection method comprises the following steps:
in step S101, the first switch 140 is controlled to be closed and the second switch 150 is controlled to be opened, and the first voltage of the positive electrode of the first bus 110, the second voltage of the negative electrode of the first bus 110, and the third voltage of the middle position of the cross detection bridge 130 in the current state are obtained.
In step S102, the first switch 140 is controlled to be opened and the second switch 150 is controlled to be closed, and the fourth voltage of the positive electrode of the first bus 110, the fifth voltage of the negative electrode of the first bus 110, and the sixth voltage of the middle position of the cross detection bridge 130 in the current state are obtained.
Step S103, an equivalent equation is established according to the first voltage, the second voltage, and the third voltage or the fourth voltage, the fifth voltage, and the sixth voltage.
Wherein, step S103 includes:
and a substep S1031, determining the type of the dc cross fault according to the positive and negative of the third voltage and the sixth voltage.
In the sub-step S1032, an equivalent equation is established according to the type of the dc cross fault and the first voltage, the second voltage, and the third voltage or the fourth voltage, the fifth voltage, and the sixth voltage.
For example, when the third voltage is positive and the sixth voltage is negative, the type of the direct-current cross-talk fault is determined to be the first fault type. And establishing an equivalent equation according to the first fault type, the first voltage, the second voltage and the third voltage.
Step S104, a resistance value of the equivalent resistor between the first bus 110 and the second bus 120 is obtained according to the equivalent equation.
Step S105, when the resistance value of the equivalent resistor is less than or equal to the preset resistance value, it is determined that the dc crosstalk fault occurs between the first bus 110 and the second bus 120.
Step S106, receiving leakage current transmitted by the Hall sensors 160 on corresponding branch lines according to the type of the direct current cross fault;
and step S107, when the leakage current of the branch line is greater than or equal to the preset current, determining the branch line as the branch line with the direct current cross fault.
In summary, the present invention provides a dc cross-over fault detection apparatus and method, where the dc cross-over fault detection apparatus includes a first bus, a second bus, a cross-over detection bridge, a first switch, a second switch, and a host, where two ends of the cross-over detection bridge are electrically connected to an anode of the first bus and a cathode of the first bus respectively, the first switch and the second switch are connected in series between the anode of the second bus and the cathode of the second bus, the cross-over detection bridge includes a detection node, and the detection node is electrically connected to both the first switch and the second switch. The host is used for acquiring a first voltage of the anode of the first bus, a second voltage of the cathode of the first bus and a third voltage of the detection node when the first switch is closed and the second switch is opened. The host is also used for acquiring a fourth voltage of the anode of the first bus, a fifth voltage of the cathode of the first bus and a sixth voltage of the detection node when the first switch is switched off and the second switch is switched off, establishing an equivalent equation according to the first voltage, the second voltage, the third voltage or the fourth voltage, the fifth voltage and the sixth voltage, so as to obtain the resistance value of the equivalent resistor between the first bus and the second bus, and determining whether the first bus and the second bus have a direct current cross fault according to the resistance value of the equivalent resistor and a preset resistance value. On one hand, the method can determine the resistance value of the equivalent resistor between the first bus and the second bus by establishing an equivalent equation, and can determine whether the first bus and the second bus have the direct current mutual crossing fault or not according to the resistance value of the equivalent resistor and the preset resistance value, so that accurate and effective detection is realized, and the stability and the reliability of a direct current system are improved. On the other hand, the direct current cross detection device provided by the invention can realize automatic detection by using the host, and does not need manual detection by workers, thereby reducing the workload of the workers.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
Claims (8)
1. A direct-current mutual-fleeing fault detection device is characterized by comprising a first bus, a second bus, a mutual-fleeing detection bridge, a first switch, a second switch and a host, wherein two ends of the mutual-fleeing detection bridge are respectively electrically connected with the anode of the first bus and the cathode of the first bus, the first switch and the second switch are connected between the anode of the second bus and the cathode of the second bus in series, the mutual-fleeing detection bridge comprises a detection node which is electrically connected with the first switch and the second switch, the host is used for acquiring a first voltage of the anode of the first bus when the first switch is closed and the second switch is opened, a second voltage of the cathode of the first bus and a third voltage of the detection node, and the host is also used for acquiring a fourth voltage of the anode of the first bus when the first switch is opened and the second switch is closed, establishing an equivalent equation according to the first voltage, the second voltage, the third voltage or the fourth voltage, the fifth voltage and the sixth voltage to obtain a resistance value of an equivalent resistor between the first bus and the second bus, and determining whether the first bus and the second bus have a direct current mutual channeling fault according to the resistance value of the equivalent resistor and a preset resistance value;
the direct current mutual crossing fault detection method comprises the following steps: the main machine is mainly applied to a direct-current mutual-crossing fault detection device, the direct-current mutual-crossing fault detection device further comprises a first bus, a second bus, a mutual-crossing detection bridge, a first switch and a second switch, two ends of the mutual-crossing detection bridge are respectively and electrically connected with an anode of the first bus and a cathode of the first bus, the first switch and the second switch are connected in series between an anode of the second bus and a cathode of the second bus, the mutual-crossing detection bridge comprises a detection node, the detection node is electrically connected with both the first switch and the second switch, and the direct-current mutual-crossing fault detection method comprises the following steps: controlling the first switch to be closed and the second switch to be opened, and acquiring a first voltage of the anode of the first bus, a second voltage of the cathode of the first bus and a third voltage of the middle position of the mutual-fleeing detection bridge in the current state; controlling the first switch to be switched off and the second switch to be switched on, and acquiring a fourth voltage of the anode of the first bus, a fifth voltage of the cathode of the first bus and a sixth voltage of the middle position of the mutual crossing detection bridge in the current state; establishing an equivalent equation according to the first voltage, the second voltage, the third voltage or the fourth voltage, the fifth voltage and the sixth voltage; obtaining the resistance value of the equivalent resistor between the first bus and the second bus according to the equivalent equation; when the resistance value of the equivalent resistor is less than or equal to a preset resistance value, it is determined that a direct current cross fault occurs between the first bus and the second bus, and the step of establishing an equivalent equation according to the first voltage, the second voltage, and the third voltage or the fourth voltage, the fifth voltage, and the sixth voltage includes: determining the type of the direct current cross fault according to the positive and negative of the third voltage and the sixth voltage; establishing an equivalent equation according to the type of the dc cross fault and the first voltage, the second voltage, and the third voltage or the fourth voltage, the fifth voltage, and the sixth voltage, wherein the step of determining the type of the dc cross fault according to the positive and negative of the third voltage and the sixth voltage includes: when the third voltage is positive and the sixth voltage is negative, determining that the type of the direct current cross-over fault is a first fault type; the step of establishing an equivalent equation according to the type of the dc cross-talk fault and the first voltage, the second voltage, and the third voltage or the fourth voltage, the fifth voltage, and the sixth voltage includes: establishing the equivalent equation according to the first fault type, the first voltage, the second voltage and the third voltage, wherein the first bus and the second bus respectively comprise a plurality of branch lines, the flow cross-over fault detection device further comprises a plurality of Hall sensors, each Hall sensor is installed on one branch line, and the direct-current cross-over fault detection method further comprises the following steps: receiving leakage current transmitted by Hall sensors on corresponding branch lines according to the type of the direct current cross fault; and when the leakage current of the branch line is greater than or equal to the preset current, determining the branch line as the branch line with the direct current cross fault.
2. The dc cross-over fault detection device of claim 1, wherein the host is further configured to determine a type of the dc cross-over fault according to the signs of the third voltage and the sixth voltage after receiving the third voltage and the sixth voltage, and establish an equivalent equation according to the type of the dc cross-over fault and the first voltage, the second voltage, and the third voltage or the fourth voltage, the fifth voltage, and the sixth voltage.
3. The dc cross-over fault detection device of claim 2, wherein the host is configured to determine that the type of the dc cross-over fault is a first fault type when the third voltage is positive and the sixth voltage is negative, and establish the equivalent equation according to the first fault type and the first voltage, the second voltage, and the third voltage; the host is further configured to determine that the type of the dc cross-talk fault is a second fault type when the third voltage is negative and the sixth voltage is negative, and establish the equivalent equation according to the second fault type and the first voltage, the second voltage, and the third voltage; the host is further configured to determine that the type of the dc cross-talk fault is a third fault type when the third voltage is negative and the sixth voltage is positive, and establish the equivalent equation according to the third fault type, the fourth voltage, the fifth voltage, and the sixth voltage; the host is further configured to determine that the type of the dc cross-talk fault is a fourth fault type when the third voltage is positive and the sixth voltage is positive, and establish the equivalent equation according to the fourth fault type, the fourth voltage, the fifth voltage, and the sixth voltage.
4. The dc cross-over fault detection device according to claim 2, wherein the first bus and the second bus each include a plurality of branch lines, the dc cross-over fault detection device further includes a plurality of hall sensors, each of the hall sensors is mounted on one of the branch lines, the hall sensor is configured to detect a leakage current of the branch line where the hall sensor is located, and send the leakage current to the host, and the host is further configured to receive the leakage current transmitted by the hall sensor on the corresponding branch line according to a type of the dc cross-over fault after it is determined that the dc cross-over fault occurs on the first bus and the second bus, and determine the branch line where the dc cross-over fault occurs according to the leakage current and a preset current.
5. The apparatus according to claim 1, wherein the apparatus further comprises a first balance bridge, a second balance bridge, and a third switch, wherein two ends of the first balance bridge are electrically connected to the positive electrode and the negative electrode of the first bus bar, respectively, two ends of the second balance bridge are electrically connected to the positive electrode and the negative electrode of the second bus bar, respectively, and a middle position of the second balance bridge is grounded through the third switch.
6. The dc cross-over fault detection device of claim 1, wherein the cross-over detection bridge comprises a first resistor and a second resistor, the first resistor and the second resistor are connected in series between a positive pole of the first bus and a negative pole of the first bus, and the detection node location is a connection of the first resistor and the second resistor.
7. The dc cross-over fault detection device according to claim 1, wherein the types of the dc cross-over fault include a first fault type, a second fault type, a third fault type, and a fourth fault type, wherein in the present embodiment, the first fault type is a positive-positive cross-over fault in which a positive electrode of the first bus bar and a positive electrode of the second bus bar have a cross-over fault; a second fault type negative-positive cross type, namely a cross fault occurs between the negative electrode of the first bus and the positive electrode of the second bus; a third fault type negative-negative pole cross type, namely a cross fault occurs between the negative pole of the first bus and the negative pole of the second bus; a fourth fault type positive-negative pole cross type, that is, a cross fault occurs between the positive pole of the first bus and the negative pole of the second bus, and after the host receives the third voltage and the sixth voltage, the type of the direct current cross fault is determined according to the positive and negative poles of the third voltage and the sixth voltage, and the judging method includes: when the third voltage is positive and the sixth voltage is negative, determining that the type of the direct current cross fault is a first fault type; when the third voltage is negative and the sixth voltage is negative, determining that the type of the direct current cross fault is a second fault type; when the third voltage is negative and the sixth voltage is positive, determining that the type of the direct current cross fault is a third fault type; and when the third voltage is positive and the sixth voltage is positive, determining that the type of the direct current cross fault is a fourth fault type, and simultaneously establishing an equivalent equation by the host according to the type of the direct current cross fault and the first voltage, the second voltage, the third voltage or the fourth voltage, the fifth voltage and the sixth voltage.
8. The apparatus according to claim 7, wherein, for the first fault type, an equivalent equation can be established according to the equivalent circuit:
i3 is I1+ I2, where Rx is an equivalent resistor between the first bus and the second bus, Ua is a first voltage, Ub is a second voltage, U0 is a third voltage, R1 is a first resistor, R2 is a second resistor, and the first voltage, the second voltage, and the third voltage can be measured by a voltage sensor, so that a resistance value of the equivalent resistor can be calculated;
for the second fault type, from the equivalent circuit, an equivalent equation can be established:
i1 ═ I2+ I3, where Rx is an equivalent resistor between the first bus and the second bus, Ua is a first voltage, Ub is a second voltage, U0 is a third voltage, R1 is a first resistor, R2 is a second resistor, since the first voltage, the second voltage, and the third voltage can all be measured by a voltage sensor, a resistance value of the equivalent resistor can be calculated, a resistance value is prestored in the host, the resistance value is a resistance value of the equivalent resistor between the first bus and the second bus when the first bus and the second bus operate normally, and when the calculated resistance value of the equivalent resistor is less than or equal to a preset resistance value, it can be determined that a loop cross exists in the current system, and the type of the loop cross is a negative-positive cross type;
for the third fault type, from the equivalent circuit, an equivalent equation can be established:
i1 is I2+ I3, where Rx is an equivalent resistor between the first bus and the second bus, Um is a first voltage, Un is a second voltage, U1 is a third voltage, R1 is a first resistor, and R2 is a second resistor, since the first voltage, the second voltage, and the third voltage can be measured by a voltage sensor, a resistance value of the equivalent resistor can be calculated, and a resistance value is prestored in the host, where the resistance value is a resistance value of the equivalent resistor between the first bus and the second bus when the first bus and the second bus operate normally, and when the calculated resistance value of the equivalent resistor is less than or equal to a preset resistance value, it can be determined that a loop cross exists in the current system, and the type of the loop cross is a negative-negative pole cross type;
for the fourth fault type, according to the equivalent circuit, an equivalent equation can be established:
i3 is I1+ I2, where Rx is an equivalent resistor between the first bus and the second bus, Um is a first voltage, Un is a second voltage, U1 is a third voltage, R1 is a first resistor, and R2 is a second resistor, since the first voltage, the second voltage, and the third voltage can be measured by a voltage sensor, a resistance value of the equivalent resistor can be calculated, and a resistance value is prestored in the host, where the resistance value is a resistance value of the equivalent resistor between the first bus and the second bus when the first bus and the second bus operate normally, and when the calculated resistance value of the equivalent resistor is less than or equal to a preset resistance value, it can be determined that a loop cross exists in the current system, and the type of the loop cross is a positive-negative cross type.
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| CN111650450B (en) * | 2020-04-03 | 2022-07-15 | 杭州奥能电源设备有限公司 | Identification method based on direct current mutual string identification device |
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