CN106199306B - System and method for checking loop state monitoring device - Google Patents
System and method for checking loop state monitoring device Download PDFInfo
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- CN106199306B CN106199306B CN201610512720.5A CN201610512720A CN106199306B CN 106199306 B CN106199306 B CN 106199306B CN 201610512720 A CN201610512720 A CN 201610512720A CN 106199306 B CN106199306 B CN 106199306B
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
The invention relates to a system and a method for checking a loop state monitoring device, the system comprising: the auxiliary current source is used for providing input current for the current transformer unit; the current transformer unit is used for providing secondary current for the loop state simulation unit according to the input current; the control unit is used for receiving a preset loop state and carrying out state setting on the loop state simulation unit according to the received preset loop state; the loop state simulation unit is used for simulating the preset loop state according to the secondary current; and a verification unit receiving a measured loop state from a loop state monitoring device and comparing the measured loop state with the preset loop state, and verifying a function of the loop state monitoring device by a comparison result.
Description
Technical Field
The present invention is in the field of equipment inspection and more particularly relates to a system and method for inspecting loop condition monitoring devices.
Background
Current transformers are important devices in power systems. The current transformer is an important link of electric energy metering because the accurate conversion from primary large current to secondary small current can be realized. The electrical connection from the current transformer output to the power meter is called the secondary loop. The running states of the current transformer body and the secondary circuit seriously affect the accuracy of electric energy metering. Therefore, the operating state of the secondary circuit of the current transformer needs to be monitored. In order to monitor the operation state of the secondary circuit of the current transformer, some scientific research units and enterprise companies develop monitoring devices capable of accurately monitoring the operation state of the secondary circuit. The monitoring device can accurately identify the states of normal connection, open circuit, short circuit and the like in the operation of the secondary circuit.
However, how to check the efficiency and reliability of the function of the monitoring device is an unsolved problem in the prior art. In general, such a check is not suitably performed by the operation of the actual apparatus. Therefore, in this case, many abnormal operating states of the secondary circuit may not occur or occur at indefinite times, thereby making the inspection impossible.
Disclosure of Invention
Currently, many abnormal operating conditions of the secondary circuit may not occur or occur at variable times, thereby making the inspection non-viable. Therefore, in order to verify the function of the current transformer secondary circuit operation state monitoring device, a system and a method for verifying the circuit state monitoring device are needed, so that the function of the monitoring device is verified and the quality of the monitoring device is improved.
According to one aspect of the present invention, there is provided a system for verifying a circuit condition monitoring device, the system comprising:
the auxiliary current source is used for providing input current for the current transformer unit;
the current transformer unit is used for providing secondary current for the loop state simulation unit according to the input current;
the control unit is used for receiving a preset loop state and carrying out state setting on the loop state simulation unit according to the received preset loop state;
the loop state simulation unit is used for simulating the preset loop state according to the secondary current; and
a verification unit receiving a measured loop state from a loop state monitoring device and comparing the measured loop state with the preset loop state, and a result of the comparison verifying a function of the loop state monitoring device.
Preferably, the loop state monitoring device performs loop state detection with respect to the loop state simulation unit to determine a measured loop state, and transmits the measured loop state to the verification unit.
Preferably, wherein the current transformer unit includes: a single current transformer with multiple transformation ratios, or multiple current transformers with different transformation ratios.
Preferably, the loop state simulation unit comprises any one or more of the following: the device comprises a secondary circuit terminal short circuit state simulation module, a secondary circuit open circuit state simulation module, a circuit series connection rectifier equipment state simulation module and a primary short circuit state simulation module.
Preferably, the secondary loop terminal short-circuit state simulation module includes: a normally open relay and a connecting terminal; the two ends of the wiring terminal are connected with the normally open relay, and the control unit controls the attraction and disconnection of the normally open relay.
Preferably, the secondary circuit open circuit state simulation module includes: a normally closed relay and a wiring terminal; the normally closed relay is connected into a secondary circuit in a series mode, and the control unit controls the normally closed relay to be disconnected and pulled in.
Preferably, the loop series rectifier device state simulation module includes: the normally closed relay and the diode are connected in parallel; the normally closed relay and the diode which are connected in parallel are connected into a secondary circuit in a series connection mode as a whole, and the control unit controls the normally closed relay to be disconnected and closed.
Preferably, the primary short-circuit state simulation module includes: a normally open relay and a short circuit lead; the normally open relay is bridged at two ends of a primary lead penetrating through the current transformer, and the control unit controls the normally open relay to be attracted and disconnected.
Preferably, wherein the control unit comprises: the short circuit control module of the secondary loop terminal, the open circuit control module of the secondary loop, the control module of the loop series connection rectifying equipment and the control module of the primary short circuit state.
Preferably, the preset loop state comprises any one or more of the following: the secondary circuit terminal short circuit state, the secondary circuit open circuit state, the loop series connection rectifier equipment state or the primary short circuit state.
According to another aspect of the present invention, there is provided a method for verifying a circuit condition monitoring device, the method comprising:
providing an input current;
converting the input current into a secondary current through a current transformer unit;
receiving a preset loop state and sending the received preset loop state to a loop state simulation unit;
simulating the preset loop state according to the secondary current; and
receiving a measured loop state from a loop state monitoring device and comparing the measured loop state with the preset loop state, and verifying a function of the loop state monitoring device by a comparison result.
The invention can verify the detection function of the loop state monitoring device by comparing the measured loop state with the preset loop state. This way, the function of the monitoring device can be verified and the quality control of the monitoring device can be improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic block diagram of a system for testing a circuit condition monitoring device in accordance with a preferred embodiment of the present invention;
fig. 2 is a schematic structural diagram of a secondary loop terminal short-circuit state simulation module according to a preferred embodiment of the invention;
FIG. 3 is a schematic diagram of a secondary loop open state simulation module according to a preferred embodiment of the present invention;
FIG. 4 is a schematic diagram of a loop cascade rectifier state simulation module according to the preferred embodiment of the present invention; and
FIG. 5 is a schematic diagram of a primary short state simulation module according to a preferred embodiment of the present invention; and
fig. 6 is a flowchart of a method of verifying a circuit state monitoring device according to a preferred embodiment of the present invention.
Detailed Description
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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Next, the present invention will be described in detail with reference to the drawings, wherein the cross-sectional views illustrating the structure of the device are not enlarged partially in general scale for convenience of illustration, and the drawings are only exemplary and should not be construed as limiting the scope of the present invention. In addition, the three-dimensional dimensions of length, width and height should be included in the actual fabrication.
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of a system 100 for testing a circuit condition monitoring device according to a preferred embodiment of the present invention. As an embodiment of the present invention, the system 100 utilizes a module for simulating different secondary circuit states, and performs the simulation of the secondary circuit states such as a secondary circuit terminal short-circuit state, a secondary circuit open-circuit state, a circuit series connection rectification device state, and a primary short-circuit state according to the control instruction, thereby realizing the simulation of the secondary circuit state of the current transformer under different transformation ratio conditions.
As shown in fig. 1, the system 100 includes: an auxiliary current source 101, a current transformer unit 102, a loop state simulation unit 103, a control unit 105, and a verification unit 106. Typically, the loop condition monitoring device 104 is located external to the system 100. Alternatively, the loop condition monitoring device 104 may be located within the system 100. Preferably, the auxiliary current source 101 is used to provide an input current for the current transformer unit 102. In general, in order to verify the circuit state monitoring device, the operation state of the secondary circuit is simulated. For this purpose, an auxiliary current source 101 is usually used to supply the input current for the simulation. Preferably, the auxiliary current source 101 may select, for example, 0.5 stage of standard current source with feedback setting in order to provide input current for various loop state simulation experiments. Typically, the output current of such standard current sources is 100A maximum.
Preferably, the current transformer unit 102 is configured to provide a secondary current to the loop state simulation unit according to the input current. The current transformer unit 102 may adopt two ways: one way is that the current transformer unit 102 is a single current transformer with multiple transformation ratios, so it can switch between the multiple transformation ratios; and another way is that the current transformer unit 102 is composed of a plurality of independent current transformers having different transformation ratios, which have independent and different transformation ratios, so that the current transformer unit 102 can be switched between the plurality of current transformers.
Preferably, to increase the applicability of the system 100, it is desirable that the system 100 operate properly under different transformation ratio conditions. For this reason, the current transformer units 102 preferably have different transformation ratios. The specific implementation manner may be the two manners as described above, and may also be other appropriate manners as long as it can enable the current transformer unit 102 to have different transformation ratios. Preferably, the transformation ratio can be as follows: 30:5, 50:5, 100:5, 300:5, 500:5 and 1500: 5. The current transformer 102 is preferably a low-voltage current transformer, such as a 0.5 class low-voltage current transformer rated at 400V. Preferably, the system 100 is operable for different secondary loop states of the secondary current transformer and is operable to receive detection results of the loop state monitoring device 104 in the different secondary loop states. The system 100 is simple and easy to implement, and can be widely used for checking the current transformer secondary circuit state detection device.
Preferably, the loop state simulation unit 103 is configured to simulate the preset loop state according to the secondary current. The loop state simulation unit 103 includes: the device comprises a secondary circuit terminal short circuit state simulation module, a secondary circuit open circuit state simulation module, a circuit series connection rectifier equipment state simulation module and a primary short circuit state simulation module. Wherein secondary circuit terminal short circuit state analog module, secondary circuit open circuit state analog module, loop concatenate rectifier equipment state analog module and a short circuit state analog module and correspond respectively to four kinds of states that are used for the current transformer secondary circuit of simulation: the secondary circuit terminal short circuit state, the secondary circuit open circuit state, the loop series connection rectifier equipment state or the primary short circuit state. Of course, the states of the secondary circuits of the current transformer units are not limited to these four types, and may be states that may occur in other secondary circuits of the current transformer.
In other words, according to the preferred embodiment of the present invention, in order to simulate the states of the four secondary loops, the loop state simulation unit 103 includes a secondary loop terminal short-circuit state simulation module, a secondary loop open-circuit state simulation module, a loop series rectifier device state simulation module, and a primary short-circuit state simulation module, respectively. Furthermore, in order to control the above-described analog modules, the control unit 105 accordingly includes: the short circuit control module of the secondary loop terminal, the open circuit control module of the secondary loop, the control module of the loop series connection rectifying equipment and the control module of the primary short circuit state.
Preferably, the secondary loop terminal short-circuit state simulation module includes: normally open relay and binding post. Wherein, the normally open relay is connected to two ends of the wiring terminal, and the control unit 105 controls the attraction and disconnection of the normally open relay, thereby simulating the start and end of a short circuit event. That is, for the secondary loop terminal short circuit state, the simulation process is: the normally open relay is connected to the two ends of the terminal, and the control part controls the pull-in and the pull-off of the normally open relay to simulate the beginning and the end of the state once. Correspondingly, fig. 2 is a schematic structural diagram of a secondary circuit terminal short-circuit state simulation module according to a preferred embodiment of the present invention. As shown in fig. 2, the secondary circuit terminal short-circuit simulation module includes a normally open relay and a connection terminal. The secondary loop terminal short circuit simulation module simulates the starting and the ending of a short circuit state by connecting a normally open relay at two ends of a terminal and controlling the attraction and the disconnection of the normally open relay by a control part. To better achieve this state simulation, the relay preferably meets the rated current 5A. The relay can be selected from a plurality of types as long as the performance index of the relay meets the parameter indexes such as rated current and the like described hereinbefore, and for example, JRX-13F-1 which is well known to those skilled in the art can be selected.
Preferably, the secondary circuit open circuit state simulation module includes: normally closed relay and binding post. The normally closed relay is connected into a secondary circuit in a series mode, and the control unit controls the normally closed relay to be disconnected and pulled in, so that the starting and the ending of an open circuit event are simulated. That is, for the open state of the secondary loop, the simulation process is: the start and the end of the state are simulated once by connecting a normally closed relay in series in a secondary circuit and controlling the opening and the closing of the normally closed relay by a control part. Accordingly, fig. 3 is a schematic structural diagram of a secondary circuit open-circuit state simulation module according to a preferred embodiment of the present invention. As shown in fig. 3, the secondary circuit open circuit simulation module includes a normally closed relay and a terminal. The secondary circuit open-circuit state simulation module simulates the beginning and the ending of an open-circuit state by serially connecting a normally closed relay in a secondary circuit and controlling the normally closed relay to be disconnected and attracted by a control part. That is, the secondary circuit open circuit simulation module comprises a normally closed relay and a wiring terminal, and the normally closed relay is connected in series in the secondary circuit. To better achieve this state simulation, the relay preferably meets the rated current 5A. The relay can be selected from a plurality of types as long as the performance index of the relay meets the parameter indexes such as rated current and the like described hereinbefore, and for example, JRX-13F-1 which is well known to those skilled in the art can be selected.
Preferably, the loop series rectifier device state simulation module comprises: and the normally closed relay and the diode are connected in parallel. In which a normally closed relay and a diode connected in parallel are connected in series into a secondary circuit as a whole, and the opening and closing of the normally closed relay is controlled by the control unit 105 to simulate the start and end of a series rectifier device event. That is, for the state of the secondary loop series rectifier device, the simulation process is as follows: the simulation is realized by connecting a unit formed by connecting a normally closed relay and a rectifying device in parallel in series in a secondary circuit, and the starting and the ending of the state are simulated once by controlling the disconnection and the pull-in of the secondary circuit by a control part. Correspondingly, fig. 4 is a schematic structural diagram of a loop series rectifier device state simulation module according to a preferred embodiment of the present invention. As shown in fig. 4, the loop series connection rectification device simulation module includes a normally closed relay and a diode, which are connected in parallel to form a module. And the module is connected in series in the secondary loop, and the control part controls the disconnection and the suction of the module to simulate the start and the end of the state of the series rectifier equipment. To better achieve this state simulation, the diode preferably satisfies the rated current 5A. The relay and the diode can be selected from a plurality of types as long as the performance index of the relay and the diode meets the parameter indexes such as rated current and the like described hereinbefore, for example, the relay can be selected from JRX-13F-1 well known by the technical personnel in the field; and the diode may be selected from FR 807.
Preferably, the primary short-circuit state simulation module comprises: the normally open relay is connected across two ends of a primary lead penetrating through the current transformer in a bridging mode, and the control unit 105 controls the normally open relay to be closed and opened to simulate the beginning and the end of a primary short-circuit event. That is, for a one-time short condition, the simulation process is: a normally open relay is bridged at two ends of a primary lead penetrating through a current transformer for simulation, and the control part controls the attraction and disconnection of the normally open relay to simulate the beginning and the end of the state. Correspondingly, fig. 5 is a schematic structural diagram of a primary short-circuit state simulation module according to a preferred embodiment of the present invention. As shown in fig. 5, the primary short-circuit state simulation module includes a normally open relay and a short-circuit wire, and the normally open relay is bridged across two ends of the primary wire penetrating through the current transformer, and the control part controls the normally open relay to be closed and opened to simulate the beginning and the end of the primary short-circuit state. That is to say, the primary short circuit state simulation module comprises a normally open relay and a short circuit lead, and the normally open relay is bridged at two ends of the primary lead penetrating through the current transformer. The relay can be selected from a plurality of types as long as the performance index of the relay meets the parameter indexes such as rated current and the like described hereinbefore, and for example, JRX-13F-1 which is well known to those skilled in the art can be selected.
Preferably, the control unit 105 is configured to receive a preset loop state and to perform state setting on the loop state simulation unit according to the received preset loop state. As described above, in order to simulate four secondary loop states, i.e., the secondary loop terminal short-circuit state, the secondary loop open-circuit state, the loop series connection rectifying device state, or the primary short-circuit state, the loop state simulation unit 103 correspondingly includes a secondary loop terminal short-circuit state simulation module, a secondary loop open-circuit state simulation module, a loop series connection rectifying device state simulation module, and a primary short-circuit state simulation module. Further, in order to control the above analog module, the control unit 105 includes: the short circuit control module of the secondary loop terminal, the open circuit control module of the secondary loop, the control module of the loop series connection rectifying equipment and the control module of the primary short circuit state.
Preferably, the simulation of the respective state is operated in accordance with instructions of the control unit, for example by the control unit sending instructions to control the start and end of the respective simulated state. For the control unit 105, the implementation of each module thereof may adopt a mode of combining a single chip microcomputer and a control circuit. The singlechip can select AT8951, and the control circuit can use drive elements such as a triode. As a preferred embodiment, the control unit includes a master MCU (model AT8951), and uses 4 output channels to control the 4 loop status simulation modules respectively. Because the relay of the rear-end analog module usually selects an JRX-13F-1 type relay, a working power supply 12VDC, an MCU output port is connected with a pull-up resistor which is connected with a base electrode of a triode, and the action of the relay is controlled by the triode, 4 paths of identical relay control circuits are needed. Preferably, the secondary loop terminal short circuit control module, the secondary loop open circuit control module, the loop series connection rectifying device control module and the primary short circuit state control module are respectively used for controlling the secondary loop terminal short circuit state simulation module, the secondary loop open circuit state simulation module, the loop series connection rectifying device state simulation module and the primary short circuit state simulation module.
Preferably, the verification unit 106 receives a measured loop state from the loop state monitoring device and compares the measured loop state with the preset loop state, and the comparison result verifies the function of the loop state monitoring device. By this comparison, the verification unit 106 verifies the function of the loop state monitoring device and improves the quality control of the loop state monitoring device.
Preferably, the loop state monitoring device 104 performs loop state detection with respect to the loop state simulation unit to determine a measured loop state, and transmits the measured loop state to the verification unit 106. In general, the circuit state monitoring device 104 is a monitoring device for accurately monitoring the operating state of the secondary circuit. The loop state monitoring device 104 can accurately identify the states of normal connection, open circuit, short circuit and the like in the operation of the secondary loop. According to an embodiment of the invention, the secondary circuit of the current transformer unit comprises four states: the secondary circuit terminal short circuit state, the secondary circuit open circuit state, the loop series connection rectifier equipment state or the primary short circuit state. The loop state monitoring device 104 may monitor a secondary loop terminal short circuit state, a secondary loop open circuit state, a loop series connection rectifying device state, or a primary short circuit state, and send a detected result to the verification unit 106.
Through the above description of the simulation device and the corresponding simulation method, those skilled in the art can realize the simulation of the secondary circuit state of the current transformer under different transformation ratio conditions, so that the inspection of various functions of the monitoring device can be realized in cooperation with the operation of the monitoring device. These functions include, for example, the normal connection, short circuit, open circuit, and primary short circuit conditions of the secondary circuit of the current transformer.
Fig. 6 is a flow chart of a method 600 of testing a circuit condition monitoring device according to a preferred embodiment of the invention. As an embodiment of the present invention, the method 600 performs simulation of secondary circuit states, such as a secondary circuit terminal short-circuit state, a secondary circuit open-circuit state, a circuit series rectifier state, and a primary short-circuit state, according to a control instruction, so as to simulate the secondary circuit state of the current transformer under different transformation ratio conditions.
As shown in fig. 6, method 600 begins at step 601. In step 601, an auxiliary current source is used to provide an input current for the current transformer unit. In general, in order to verify the circuit state monitoring device, the operation state of the secondary circuit is simulated. For this purpose, an auxiliary current source is usually used to supply the input current for the simulation. Preferably, the auxiliary current source may select, for example, 0.5 stage standard current source with feedback setting in order to provide input current to various loop state simulation experiments. Typically, the output current of such standard current sources is 100A maximum.
Preferably, in step 602, a current transformer unit is utilized to provide a secondary current to the loop state simulation unit according to the input current. The current transformer unit can adopt two modes: one way is that the current transformer unit is a single current transformer with multiple transformation ratios, so it can switch between the multiple transformation ratios; and another way is that the current transformer unit is composed of a plurality of independent current transformers having different transformation ratios, which have independent and different transformation ratios, so that the current transformer unit can be switched between the plurality of current transformers.
Preferably, to increase the applicability of method 600, method 600 is required to operate properly under different transformation ratios. For this purpose, the current transformer units preferably have different transformation ratios. The specific implementation manner may be two manners as described above, and may also be other appropriate manners as long as it can enable the current transformer units to have different transformation ratios. Preferably, the transformation ratio can be as follows: 30:5, 50:5, 100:5, 300:5, 500:5 and 1500: 5. The current transformer is preferably a low-voltage current transformer, such as a 0.5-class low-voltage current transformer rated at 400V.
Preferably, in step 603, a preset loop state is received and transmitted to the loop state simulation unit. The loop state simulation unit includes: the device comprises a secondary circuit terminal short circuit state simulation module, a secondary circuit open circuit state simulation module, a circuit series connection rectifier equipment state simulation module and a primary short circuit state simulation module. Wherein secondary circuit terminal short circuit state analog module, secondary circuit open circuit state analog module, loop concatenate rectifier equipment state analog module and a short circuit state analog module and correspond respectively to four kinds of states that are used for the current transformer secondary circuit of simulation: the secondary circuit terminal short circuit state, the secondary circuit open circuit state, the loop series connection rectifier equipment state or the primary short circuit state. Of course, the states of the secondary circuit of the current transformer are not limited to these four types, and may be states that may occur in other secondary circuits of the current transformer.
In other words, according to a preferred embodiment of the present invention, in order to simulate the states of the four secondary circuits, the circuit state simulation unit includes a secondary circuit terminal short-circuit state simulation module, a secondary circuit open-circuit state simulation module, a circuit series rectifier device state simulation module, and a primary short-circuit state simulation module, respectively.
Preferably, at step 604, the preset loop state is simulated based on the secondary current. In general, a circuit state monitoring device is a monitoring device for accurately detecting an operation state of a secondary circuit. The loop state monitoring device can realize accurate identification of the states of normal connection, open circuit, short circuit and the like in the operation of the secondary loop. According to an embodiment of the invention, the secondary circuit of the current transformer comprises four states: the secondary circuit terminal short circuit state, the secondary circuit open circuit state, the loop series connection rectifier equipment state or the primary short circuit state. The loop state monitoring device can monitor the secondary loop terminal short circuit state, the secondary loop open circuit state, the loop series connection rectifying equipment state or the primary short circuit state, and sends the detected result to the verification unit.
Preferably, in step 605, a measured loop state is received from a loop state monitoring device and compared with the preset loop state, and the comparison result verifies the function of the loop state monitoring device. As described above, in order to simulate the states of the four secondary circuits, i.e., the short-circuit state of the secondary circuit terminal, the open-circuit state of the secondary circuit, the state of the series-connected rectifying device of the circuit, or the primary short-circuit state, the circuit state simulation unit correspondingly includes a secondary circuit terminal short-circuit state simulation module, a secondary circuit open-circuit state simulation module, a state simulation module of the series-connected rectifying device of the circuit, and a primary short-circuit state simulation module. Further, in order to control the analog module, the control unit includes: the short circuit control module of the secondary loop terminal, the open circuit control module of the secondary loop, the control module of the loop series connection rectifying equipment and the control module of the primary short circuit state.
Preferably, the simulation of the respective state is operated in accordance with instructions of the control unit, for example by the control unit sending instructions to control the start and end of the respective simulated state. The control unit receives a preset loop state and performs state setting on the loop state simulation unit according to the received preset loop state. Preferably, the secondary loop terminal short circuit control module, the secondary loop open circuit control module, the loop series connection rectifying device control module and the primary short circuit state control module are respectively used for controlling the secondary loop terminal short circuit state simulation module, the secondary loop open circuit state simulation module, the loop series connection rectifying device state simulation module and the primary short circuit state simulation module.
Through the above description of the simulation device and the corresponding simulation method, those skilled in the art can realize the simulation of the secondary circuit state of the current transformer under different transformation ratio conditions, so that the inspection of various functions of the monitoring device can be realized in cooperation with the operation of the monitoring device. These functions include, for example, the normal connection, short circuit, open circuit, and primary short circuit conditions of the secondary circuit of the current transformer.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (15)
1. A system for verifying a loop condition monitoring device, the system comprising:
the auxiliary current source is used for providing input current for the current transformer unit;
the current transformer unit is used for providing secondary current for the loop state simulation unit according to the input current;
the control unit is used for receiving a preset loop state and carrying out state setting on the loop state simulation unit according to the received preset loop state;
the loop state simulation unit is used for simulating the preset loop state according to the secondary current; the loop state simulation unit comprises any one or more of the following components: the device comprises a secondary circuit terminal short circuit state simulation module, a secondary circuit open circuit state simulation module, a circuit series connection rectifier equipment state simulation module and a primary short circuit state simulation module; and the checking unit is used for receiving the measured loop state from the loop state monitoring device, comparing the measured loop state with the preset loop state and checking the function of the loop state monitoring device according to the comparison result.
2. The system of claim 1, the loop condition monitoring device performs loop condition detection for a loop condition simulation unit to determine a measured loop condition, and sends the measured loop condition to a verification unit.
3. The system of claim 1, wherein the current transformer unit comprises: a single current transformer with multiple transformation ratios, or multiple current transformers with different transformation ratios.
4. The system of claim 1, wherein the secondary loop open state simulation module comprises: a normally closed relay and a wiring terminal; the normally closed relay is connected into a secondary circuit in a series mode, and the control unit controls the normally closed relay to be disconnected and pulled in.
5. The system of claim 1, wherein the loop cascade rectification device state simulation module comprises: the normally closed relay and the diode are connected in parallel; the normally closed relay and the diode which are connected in parallel are connected into a secondary circuit in a series connection mode as a whole, and the control unit controls the normally closed relay to be disconnected and closed.
6. The system of claim 1, the primary short state simulation module comprising: a normally open relay and a short circuit lead; the normally open relay is bridged at two ends of a primary lead penetrating through the current transformer, and the control unit controls the normally open relay to be attracted and disconnected.
7. The system of claim 1, wherein the control unit comprises: the short circuit control module of the secondary loop terminal, the open circuit control module of the secondary loop, the control module of the loop series connection rectifying equipment and the control module of the primary short circuit state.
8. The system of claim 1, wherein the preset loop state comprises any one or more of: the secondary circuit terminal short circuit state, the secondary circuit open circuit state, the loop series connection rectifier equipment state or the primary short circuit state.
9. A method for verifying a loop condition monitoring device, the method comprising:
providing an input current;
converting the input current into a secondary current through a current transformer unit;
receiving a preset loop state and sending the received preset loop state to a loop state simulation unit; the loop state simulation unit comprises any one or more of the following components: the device comprises a secondary circuit terminal short circuit state simulation module, a secondary circuit open circuit state simulation module, a circuit series connection rectifier equipment state simulation module and a primary short circuit state simulation module;
simulating the preset loop state according to the secondary current; and
receiving a measured loop state from a loop state monitoring device and comparing the measured loop state with the preset loop state, and verifying a function of the loop state monitoring device according to a comparison result.
10. The method of claim 9, further comprising performing, by the loop state monitoring device, loop state detection for the loop state simulation unit to determine a measured loop state.
11. The method of claim 9, wherein the current transformer unit comprises: a single current transformer with multiple transformation ratios, or multiple current transformers with different transformation ratios.
12. The method of claim 9, wherein the secondary loop open state simulation module comprises: a normally closed relay and a wiring terminal; the normally closed relay is connected into a secondary circuit in a series connection mode, and the normally closed relay is controlled to be disconnected and closed.
13. The method of claim 9, wherein the loop cascade rectification device state simulation module comprises: the normally closed relay and the diode are connected in parallel; the normally closed relay and the diode which are connected in parallel are connected into a secondary circuit in a series connection mode as a whole, and the normally closed relay is controlled to be disconnected and closed.
14. The method of claim 9, the primary short state simulation module comprising:
a normally open relay and a short circuit lead; the normally open relay is bridged at two ends of a primary lead penetrating through the current transformer and is controlled to be attracted and disconnected.
15. The method of claim 9, the preset loop state comprising any one or more of: the secondary circuit terminal short circuit state, the secondary circuit open circuit state, the loop series connection rectifier equipment state or the primary short circuit state.
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| CN101852844A (en) * | 2009-04-03 | 2010-10-06 | 华北电力科学研究院有限责任公司 | Data calibration device of AC sampling and measuring device and method thereof |
| CN101937048B (en) * | 2010-07-27 | 2012-10-03 | 上海诺雅克电气有限公司 | Wire-break self diagnosis method and device for current transformer secondary coils |
| CN102411112B (en) * | 2011-08-02 | 2013-07-31 | 长沙威胜信息技术有限公司 | Method and circuit for detecting secondary side wiring state of primary metering CT (Computed Tomography) outside terminal |
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| CN103777169A (en) * | 2014-01-09 | 2014-05-07 | 广西电网公司电力科学研究院 | Electric energy metering transformer simulation verification system |
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