Batch automatic detection method for multifunctional meters

Abstract

The invention discloses an automatic batch detection method for multifunctional meters. The method comprises the following steps: (1) constructing a detection system by adopting a standard source, a current relay, a communication relay and a control system, and establishing a detection unit group; (2) detecting system line connection; (3) address setting: in the address setting process, addresses are allocated to all the to-be-tested multifunctional meters in sequence, and the to-be-tested multifunctional meters are in an online state; and (4) power-on test: the control system compares detection data with standard data output by the standard source to judge whether an error is within an allowable range, namely whether the product is qualified. The device has the advantages that addresses of newly-installed multifunctional meters can be automatically modified in sequence through the on-off mode of the relays, the address conflict problem is effectively prevented, and the number of detection instruments can be set through the on-off mode of the relays.

Description

Technical Field

[0001] This invention relates to a testing technology for electricity meters, specifically a batch automatic testing method for multifunctional meters. Background Technology

[0002] Currently, factory batch testing instruments use a daisy-chain communication method, requiring manual changes to the communication address, which is very inconvenient and time-consuming due to long polling times. This is particularly problematic for batch testing of multi-function meters. Figure 1 As shown, there is usually only one standard source and only one set of current outputs. Therefore, the current lines on the testing fixture are connected in series. If the number of testing instruments is not enough to match the number on the testing fixture, the current is in an open circuit state, making testing impossible and causing significant inconvenience. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a batch automatic detection method for multifunction meters that can automatically modify the address of newly installed multifunction meters to prevent address conflicts and can also realize the setting of the number of detection instruments.

[0004] To solve the above-mentioned technical problems, the automatic detection method for batch multi-functional tables of the present invention includes the following steps: (1) Detection system setup The detection system is constructed using a standard source, current relays, communication relays, and a control system. The required number of detection unit groups are established, consisting of current relays and multi-function meters to be tested that can be connected to the input terminals of the current relays. Each current relay in the detection unit group has two switchable output terminals. (2) Detection system wiring connection Connect the output of the standard source to the input of the multifunction meter under test in the first group of detection units. Connect the series output of each current relay to the input of the multifunction meter under test in the next group of detection units in sequence, and connect the return output to the input of the standard source to form a loop. Then connect the signal terminals of each group of detection units to the control system through a communication relay, and also connect the signal terminal of the standard source to the control system. (3) Address settings First, all communication relays are energized, and all multifunction meters in the detection unit groups are offline. Then, the communication relays in the second detection unit group are de-energized. When the multifunction meter in the second detection unit group with address 1 is detected to be online, the control system sets its address to 2. At this time, the device with address 1 goes offline, and the device with address 2 goes online. When the multifunction meter in the second detection unit group with address 2 is detected to be online, the third communication relay is de-energized. When the multifunction meter in the third detection unit group with address 1 is detected to be online, the control system sets its address to 3. At this time, the device with address 1 goes offline, and the device with address 3 goes online. This cycle continues until the multifunction meters in the last detection unit group are re-energized after being set with a new address. Then, the first communication relay is de-energized, and the multifunction meter in the first detection unit group with address 1 goes online. At this time, all the multifunction meters under test are assigned addresses in sequence and are online, that is, the address setting step is completed. (4) Power-on test First, the current relay in the last group of detection units is energized, forming a series circuit between the standard source and each group of detection units. Then, the standard source is controlled to output a standard current. Since the current relays except for the last group of detection units are de-energized, the current will flow through the series output terminal to the next group of detection units in sequence. After flowing through each group of detection units in sequence, it will be sent back to the input terminal of the standard source by the return output terminal of the last current relay. Subsequently, the detection data of the multifunction meter corresponding to each address will be transmitted to the control system through the communication line. The control system can then determine whether the error is within the allowable range, i.e., whether the product is qualified, by comparing the detection data with the standard data output by the standard source.

[0005] Furthermore, each of the aforementioned communication relays is connected to the control system via a hub.

[0006] Furthermore, the output terminal of the current relay includes a series terminal and a return terminal that can be switched by a switching switch. Each of the series terminals is sequentially connected to the input terminal of the multifunction meter in the next group of detection units, and the output terminal of each of the return terminals is connected to the input terminal of a standard source.

[0007] Furthermore, the hub is a 485 hub.

[0008] The advantages of this invention are: (1) The detection system is built by using a standard source, current relay, communication relay and control system and adopts a specific detection method based on the detection system. It can not only automatically modify the address of the newly installed multi-function meter by turning the relay on and off in turn, effectively preventing address conflict problems, but also set the number of detection instruments by turning the relay on and off.

[0009] (2) Connect the communication line of the communication relay to the normally closed point. That is, the communication line is connected when the communication relay is de-energized and disconnected when the communication relay is energized. This not only greatly reduces the polling time and reduces the impact of electromagnetic interference, but also physically disconnects the communication line of the multi-function meter by energizing the communication relay, so that the multi-function meter under test can be connected to the network in sequence by de-energizing the communication relay, thereby realizing automated address setting and greatly improving the detection efficiency.

[0010] (3) Connect a current relay to the current output terminal of the multifunction meter. This allows you to test as many meters as you need. Then, you can start the standard source to test the multifunction meter. By comparing the data read in the background with the standard source, you can automatically determine the error and whether the multifunction meter is qualified. The operation is very simple and convenient.

[0011] (4) A current relay with a series terminal and a return terminal is set after each multifunction meter test position. It can control the current flow to the input terminal of the next multifunction meter or return to the input terminal of the standard source. When the test position of the multifunction meter under test is not filled, the current loop can be completed and the subsequent test steps can be started by energizing the last current relay. Compared with the traditional method of manually shorting the empty test position, the number of tests is more flexible. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of a traditional single test wiring. Figure 2 This is the wiring diagram of the current signal of the detection system in this invention. Detailed Implementation

[0013] The automatic detection method for batch multi-functional tables of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0014] As shown in the figure, the automatic detection method for batch multi-functional tables of the present invention includes the following steps: (1) Detection system setup The detection system is constructed using a standard source 1, multiple current relays 2, multiple communication relays 3, and a control system 4. The required number of detection unit groups are established, consisting of current relays 2 and multi-function meters 5 that can be connected to the input terminals of the current relays. Each current relay in each detection unit group has two switchable series output terminals and return current output terminals. That is, the output terminal of each current relay 2 includes multiple pairs of series terminals 7 and return current terminals 8 that can be switched by a switching switch (each pair of series terminals 7 and return current terminals 8 corresponds to one output terminal of one multi-function meter). (2) Detection system wiring connection Connect the output of standard source 1 to the input of the multifunction meter under test in the first group of test units (e.g., 1A* corresponds to 1A*, 1B* corresponds to 1B*, 1C* corresponds to 1C*). Connect each phase output of multifunction meter 2 in the test unit group to the corresponding input of current relay 3 in the corresponding test unit group. Connect the series output of each current relay 2 to the input of the multifunction meter under test in the next group of test units in sequence, and connect the return output to the input of the standard source to form a loop. That is, each series terminal 7 is connected to the input of the multifunction meter in the next group of test units in sequence, and the output of each return terminal 8 is connected to the input of the standard source (taking the first group of test units as an example: such as the series terminal 7 corresponding to current relay 1A). Connect the input terminal 1A* of the second function meter, and connect the return terminal 8 of the current relay 1A to the input terminal 1A of the standard source; connect each detection unit group sequentially until the last multifunction meter 2 and its corresponding current relay 3 are connected. The last current relay 3 only needs to be wired to the return terminal 8; in the initial state, the current flows to the series terminal 7, that is, when the current relay 3 is de-energized, the current flows to the series terminal 7, and when the current relay 3 is energized, the current flows to the return terminal 8; then connect the signal terminals of the multifunction meters in each detection unit group to the control system through a communication relay and a hub 6 (e.g., IE corresponds to 1JD, 2E corresponds to 2JD...nE corresponds to nJD), and at the same time connect the signal terminals of the standard source through the hub to... Figure 2 The wiring method connects to the control system, which uses a PLC controller (see...). Figure 2 ); In actual use, since the default address of the new multifunction meter 2 is 1, to avoid address conflict issues, it is divided into two steps: address setting and power-on testing. (3) Address settings First, all communication relays 3 are energized. At this time, all multifunction meters 5 in the detection unit groups are offline. Then, the communication relays in the second detection unit group are de-energized. When the multifunction meter in the second detection unit group with address 1 is detected to be online, the control system sets its address to 2. At this time, the multifunction meter with address 1 goes offline, and the multifunction meter with address 2 goes online. When the multifunction meter in the second detection unit group with address 2 is detected to be online, the third communication relay is de-energized. When the multifunction meter in the third detection unit group with address 1 is detected to be online, the control system sets its address to 3. At this time, the multifunction meter with address 1 goes offline, and the multifunction meter with address 3 goes online. This cycle continues until the multifunction meters in the last detection unit group are re-energized after being set with a new address. Then, the first communication relay is de-energized, and the multifunction meter in the first detection unit group with address 1 goes online. At this time, all the multifunction meters under test are assigned addresses in sequence and are online, that is, the address setting step is completed (all addresses of the new meters are set to 1 by default). (4) Power-on test First, the current relay 2 in the last group of detection units is energized, forming a series circuit between the standard source 1 and each group of detection units. Then, the standard source 1 is controlled to output a standard current. Since the current relays except for the last group of detection units are de-energized, the current will flow through the series output terminal to the next group of detection units in sequence. After flowing through each group of detection units in sequence, it will be sent back to the input terminal of the standard source 1 by the return output terminal of the last current relay. Subsequently, the detection data of the multifunction meter corresponding to each address will be transmitted to the control system through the communication line. The control system can then determine whether the error is within the allowable range by comparing the detection data with the standard data output by the standard source, i.e., whether the product is qualified.

[0015] This step effectively solves the problem of traditionally requiring a series connection of standard current sources and difficult tooling changes, especially when a current relay is connected to the current output terminal of the multi-function meter. This allows for measuring only the number of meters used. For example, if the original fixture had a rack for 30 meters, but now only 25 meters are available, the control system can be set to have 25 multi-function meters. This energizes the 25th relay, creating a current loop that allows current to flow through the first 25 multi-function meters. The basic principle is as follows: A complete installation should consist of 30 meters. The communication addresses should be arranged in order from 1 to 30, but the factory default communication address for each meter is 1. Simultaneous communication can lead to errors. Therefore, the control system controls the opening and closing of each communication relay to control the connection and disconnection of each communication line. For example: When the equipment is powered on, all communication relay contacts are in the normally open state. The default address of the first line is 1, so the second relay contact activates, and communication is established. After the control system establishes communication, the 485 communication address of the meter is changed to 2. Upon re-establishing communication and confirming that the meter's address has changed to 2, the communication relay resets, and the next communication relay (#3) activates. After the control system establishes communication, the 485 communication address of the meter is changed to 3, and upon re-establishing communication and confirming that the meter's address has changed to 3, the communication relay resets, and the next relay (#3) activates. This process repeats until the address of the 30th meter is changed to 30. At this point, all communication relays are set. The control system can communicate with and read data from all 30 meters simultaneously, using the data to determine if the meters are functioning correctly.

[0016] Furthermore, the hub 6 mentioned above uses a 485 hub, and each 485 hub can simultaneously acquire 8 signals. This not only greatly reduces the polling time but also facilitates the physical disconnection of the multifunction meter's communication line via communication relays. Considering electromagnetic interference, all communication relay lines are connected to normally closed contacts (e.g., ...). Figure 2 As shown, it has a toggle switch; the communication line will only disconnect when the communication relay is energized.

Claims

1. A batch multi-function table automatic detection method, characterized in that, The method comprises the following steps: (1) Detection system building The detection system is built by using a standard source (1), current relays (2), communication relays (3) and a control system (4), and a required number of detection unit groups are established by the current relays (2) and the multifunctional tables (5) to be tested which can be connected to the input ends of the current relays, wherein each current relay in each detection unit group has two output ends which can be switched; (2) Detection system line connection The output end of the standard source (1) is connected to the input end of the multifunctional table to be tested in the first detection unit group, the series output ends of each current relay (2) are connected to the input ends of the multifunctional tables to be tested in the next detection unit group in turn, and the backflow output ends are connected to the input end of the standard source to form a loop; the signal ends of each detection unit group are connected to the control system through a communication relay, and the signal end of the standard source is also connected to the control system; (3) Address setting First, all the communication relays (3) are powered on, at this time, the multifunctional tables (5) in all the detection unit groups are offline, then the corresponding communication relay in the second detection unit group is powered off, when the multifunctional table in the second detection unit group with an address of 1 is detected to be online, the control system sets its address to 2, at this time, the device with an address of 1 is offline, and the device with an address of 3 is online, when the multifunctional table in the second detection unit group with an address of 2 is detected to be online, the third communication relay is powered off, when the multifunctional table in the third detection unit group with an address of 1 is detected to be online, the control system sets its address to 3, at this time, the device with an address of 1 is offline, and the device with an address of 3 is online, and the cycle continues until the multifunctional table in the last detection unit group is set with a new address and then is online again, then the first communication relay is powered off, and the multifunctional table in the first detection unit group with an address of 1 is online, at this time, all the multifunctional tables to be tested are assigned with addresses in turn and are in an online state, that is, the address setting step is completed; (4) Power-on test First, the current relays (2) in the last detection unit group are powered on to form a series loop between the standard source (1) and each detection unit group, then the standard source (1) outputs a standard current, since the current relays except the current relays in the last detection unit group are in a powered-off state, the current flows to the next detection unit group through the series output ends in turn, and is transported back to the input end of the standard source (1) by the backflow output end of the last current relay after flowing through each detection unit group in turn, then the detection data of each address corresponding multifunctional table is transmitted to the control system through the communication line, and the control system can judge whether the error is within the allowable range or not by comparing the detection data with the standard data output by the standard source, that is, whether the product is qualified or not.

2. The batch multi-function table automatic detection method according to claim 1, characterized in that: Each communication relay (3) is connected to the control system (4) through a hub (6).

3. The batch multi-function table automatic detection method according to claim 1 or 2, characterized in that: The output end of the current relay (2) comprises series connection terminals (7) and return flow terminals (8) switched by a switch, each series connection terminal (7) is connected to the input end of a multifunction meter in the next group of detection units, and the output end of each return flow terminal (8) is connected to the input end of a standard source.

4. The batch multi-function table automatic detection method according to claim 3, characterized in that: The hub (6) is a 485 hub.

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