An insulation monitoring alarm circuit

Abstract

The utility model discloses an insulation monitoring alarm circuit, apply in frequency converter test board, the circuit includes: insulation detector coupler is connected with insulation monitor and the input bus of the frequency converter to be detected respectively, insulation detector is connected with insulation detector coupler through high voltage relay module, and still is connected with control module through RS485, control module is connected with insulation detector and sound light alarm ware SG respectively, power module is used for the power supply of insulation detector, control module and sound light alarm ware SG. Can control insulation detector whether access circuit through high voltage relay module to avoid when carrying out the detection to the frequency converter with self insulation monitoring function, the false alarm also can when carrying out the detection to the frequency converter without insulation monitoring function, realizes insulation detection purpose.

Description

Technical Field

[0001] This utility model belongs to the field of frequency converter technology, and specifically relates to an insulation monitoring alarm circuit. Background Technology

[0002] A frequency converter test bench is a device that can perform functional tests on frequency converters. When testing frequency converters, insulation detection is a key link to ensure the safe and stable operation of electrical systems. However, when performing insulation detection on a frequency converter test bench, if the frequency converter itself also has an insulation monitoring function, the insulation monitoring module of the frequency converter and the insulation detection unit in the frequency converter test bench will detect each other, thus causing false alarms.

[0003] Therefore, how to avoid false alarms caused by mutual detection between inverters with built-in insulation monitoring functions when performing insulation testing on inverter test benches is a technical problem that needs to be solved by those skilled in the art. Utility Model Content

[0004] The purpose of this invention is to solve the technical problem that the insulation monitoring alarm circuit in the test bench easily conflicts with the built-in insulation monitoring function of the frequency converter in the prior art. Therefore, this invention provides an insulation monitoring alarm circuit for use in a frequency converter test bench. The circuit includes: The insulation tester coupler B1 is connected to the insulation monitor B2 and the input bus of the inverter under test, respectively. The insulation tester B2 is connected to the insulation tester coupler B1 via the high-voltage relay module B3, and is also connected to the control module via RS485. The control module is connected to the insulation detector B2 and the audible and visual alarm SG, respectively. The power supply module is used to supply power to the insulation detector B2, the control module, and the audible and visual alarm SG.

[0005] Furthermore, the contacts corresponding to the high-voltage relay module are normally closed contacts.

[0006] Furthermore, the control module is specifically connected to the audible and visual alarm SG via relays KA1, KA2, and KA3, and relay KA4 is connected to the power supply module. Relay KA4 is controlled to turn on and off via rotary switch SA1, and the contacts of relay KA4 control the power supply to and from the high-voltage relay module B3.

[0007] Furthermore, the power module specifically includes: The input terminal of the step-down chip SG1 is connected to the terminal X1 of the 220V power supply. The first output terminal of the step-down chip SG1 is 24V+ and is connected to the terminal X2. The second output terminal of the step-down chip SG1 is 24V- and is connected to the terminal X3. The PE terminal of the step-down chip is grounded.

[0008] Furthermore, the control module is connected to the operator console of the frequency converter test bench via an EtherNET communication port.

[0009] Furthermore, the contacts of relay KA1 are connected to port 1 of the yellow flashing light HB1 in the power module and the audible and visual alarm SG, respectively; the contacts of relay KA2 are connected to port 2 of the power module and the red flashing light HB2, respectively; the contacts of relay KA3 are connected to port 3 of the power module and the buzzer in the audible and visual alarm SG, respectively; and the contacts of relay KA4 are connected to port 1 of the power module and the high-voltage relay module B3, respectively.

[0010] Furthermore, the buzzer, red flashing light HB2, and yellow flashing light HB1 are all connected to the power module.

[0011] Compared with the prior art, the beneficial effects of this utility model are: This utility model provides an insulation monitoring and alarm circuit. Compared with the prior art, this circuit includes: an insulation detector coupler, connected to the input bus of both the insulation detector and the inverter under test; the insulation detector is connected to the insulation detector coupler via a high-voltage relay module and also connected to a control module via RS485; the control module is connected to both the insulation detector and the audible and visual alarm SG; and a power supply module is used to supply power to the insulation detector, the control module, and the audible and visual alarm SG. The high-voltage relay module can control whether the insulation detector is connected to the circuit, thereby avoiding false alarms when testing inverters with built-in insulation monitoring functions, and also achieving insulation detection when testing inverters without insulation monitoring functions. Attached Figure Description

[0012] To more clearly illustrate the embodiments of this specification, the accompanying drawings used in the embodiments will be briefly introduced below. The drawings described below are only some embodiments recorded in this specification. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 The diagram shown is a structural schematic of the insulation monitoring alarm circuit provided in the embodiment of this specification; Figure 2 The diagram shown is a connection diagram between the insulation tester coupler and the insulation tester provided in the embodiments of this specification; Figure 3 The diagram shown is a structural schematic of the control module provided in an embodiment of this specification. Figure 4 The diagram shown is a structural schematic of the power module provided in an embodiment of this specification. Figure 5 The diagram shown is a structural schematic of the audible and visual alarm SG provided in the embodiment of this specification. Figure 6 The diagram shown is a schematic diagram of the contact connections of relays KA1, KA2, KA3 and KA4 in the embodiments of this specification. Detailed Implementation

[0014] To enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this specification, and not all embodiments. Based on the embodiments in this specification, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this specification.

[0015] like Figure 1 The diagram shown is a schematic representation of the insulation monitoring alarm circuit provided in the embodiments of this specification. Although this specification provides the structures shown in the embodiments or figures below, based on conventional methods or without creative effort, the structures may include more or fewer structures after partial combination. These structures are not limited to those shown in the embodiments or figures of this specification. When the structures are applied in actual devices or terminal products, they can be executed sequentially or in parallel according to the embodiments or module structures.

[0016] The insulation monitoring alarm circuit provided in the embodiments of this specification is applied in a frequency converter test bench, and can also be applied in other scenarios that require insulation monitoring. This circuit includes: The insulation tester coupler B1 is connected to the insulation monitor B2 and the input bus of the inverter under test, respectively. The insulation tester B2 is connected to the insulation tester coupler B1 via the high-voltage relay module B3, and is also connected to the control module via RS485. The control module is connected to the insulation detector B2 and the audible and visual alarm SG, respectively. The power supply module is used to supply power to the insulation detector B2, the control module, and the audible and visual alarm SG.

[0017] Specifically, the insulation monitoring alarm circuit provided in this application includes an insulation tester coupler B1, an insulation tester B2, a control module, an audible and visual alarm SG, and a power supply module. The insulation tester coupler B1 couples the insulation tester B2 to the circuit under test. Figure 2 The diagram shows the connection between the insulation tester coupler and the insulation tester. The insulation tester coupler B1 is used together with the insulation tester to detect high-voltage circuits. The HV port of the insulation tester coupler B1 is connected to the circuit being tested, which can be the input bus of the inverter under test or other circuits of the inverter under test. The PE port of the insulation tester coupler B1 is also the grounding port. While grounding, the PE port is also connected to and grounded to the PE terminal of the insulation tester B2 through the first switch of the high-voltage relay module B3. The AK port of the insulation tester coupler B1 is connected to the insulation tester through the second switch of the high-voltage relay module B3. The L1 and L2 terminals of insulation detector B2 are connected, and the A1 and A2 terminals of insulation detector B2 are connected to the power supply module. The first and second switches of high-voltage relay module B3 are normally closed switches, i.e., normally closed contacts. The high-voltage relay module B3 can be used to determine whether insulation detector B2 is connected to the circuit being tested, thus avoiding false alarms when testing inverters with built-in insulation monitoring functions. It can also be used to perform insulation testing on inverters without insulation monitoring functions. Insulation detector B2 is also connected to the control module via an RS485 port using a twisted-pair cable, allowing the test data to be transmitted to the control panel of the inverter test bench. The control module is specifically a Leadshine MC516CS, capable of implementing the actions proposed in this application. The power supply module provides 24V power to insulation detector B2, the control module, and the audible and visual alarm SG.

[0018] Specifically, such as Figure 6 The diagram shows the contact connections of relays KA1, KA2, KA3, and KA4. Terminal A1 of relay KA4 is connected to port 4 of rotary switch SA1 via terminal X5. Port 3 of rotary switch SA1 is connected to port 3 of terminal X2 via terminal X5, thus connecting a 24V power supply to the power module. When no frequency converter is connected to the load test bench, rotating the rotary switch to the stop position closes the normally open contact of relay KA4. This energizes the coil of high-voltage relay module B3, causing its normally closed contact to open, thus disconnecting the insulation monitor from the detection circuit. When a frequency converter is connected to the load test bench, the normally open contact of relay KA4 is open, the coil of the high-voltage relay module is not energized, and its normally closed contact is closed, allowing the insulation monitor to connect to the detection circuit.

[0019] In the embodiments of this application, such as Figure 4 The diagram shown is a structural schematic of a power module, which specifically includes: The input terminal of the step-down chip SG1 is connected to the 220V power supply terminal X1. The first output terminal of the step-down chip SG1 is 24V+ and is connected to the terminal X2. The second output terminal of the step-down chip SG1 is 24V- and is connected to the terminal X3. The PE terminal of the step-down chip is grounded. The power supply module uses a switching power supply with a power supply range of AC100-220V. The 24V output terminal of the switching power supply is used to power the control module, the insulation detector B2, and the audible and visual alarm SG.

[0020] In the embodiments of this application, such as Figure 3 The diagram shows the structure of the control module, which is connected to the control panel of the frequency converter test bench via an Ethernet communication port. Specifically, the control module is connected to the audible and visual alarm SG via relays KA1, KA2, and KA3, and relay KA4 is connected to the power supply module. Relay KA4 is controlled to switch on and off via a rotary switch SA1, and the contacts of relay KA4 control the power supply to and from the high-voltage relay module B3.

[0021] Specifically, the PLC is a Leadshine MC516CS, utilizing one COM port (RS485 communication), three DO ports, and one Ethernet communication port. The PLC controls the audible and visual alarm via DO1-3 ports and relays KA1-KA3. The PLC's COM port (RS485 communication) is connected to the RS485 communication port of the insulation monitor, enabling signal transmission between the PLC and the insulation monitor. The PLC uses DO1 port... Figure 3 The PLC controls whether the insulation monitor is connected to the circuit via its OUT port and relay KA1; the PLC controls the audible and visual alarm via its DO2-3 port and relays KA2-KA3. The PLC's COM port (RS485 communication) is connected to the insulation monitor's RS485 communication port, enabling signal transmission between the PLC and the insulation monitor. The PLC transmits insulation monitoring information to the control panel via its Ethernet communication port. The host computer on the control panel displays the insulation monitoring information, and when the control panel receives an insulation alarm fault signal, it issues a command to disconnect the main circuit breaker of the power distribution line.

[0022] like Figure 5 The diagram shown is a schematic of the SG structure of the audible and visual alarm. Figure 6The diagram shows the contact connections of relays KA1, KA2, KA3, and KA4. The contacts of relay KA1 are connected to port 1 of the yellow flashing light HB1 in the power module and the audible and visual alarm SG, respectively. The contacts of relay KA2 are connected to port 2 of the power module and the red flashing light HB2, respectively. The contacts of relay KA3 are connected to port 3 of the power module and the buzzer in the audible and visual alarm SG, respectively. The buzzer, red flashing light HB2, and yellow flashing light HB1 are also connected to the power module.

[0023] It should be understood that when an element is referred to as “fixed to” or “set on” another element, it may be directly on the other element or may be interposed with an intervening element; when an element is referred to as “connected to” another element, it may be directly connected to the other element or may be interposed with an intervening element. Furthermore, the term “connected” as used herein may include wireless connections; the word “and / or” as used includes any and all combinations of one or more of the associated listed items.

[0024] It should be understood that various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0025] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0026] Furthermore, the functional units in the various embodiments of this application can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0027] The storage media mentioned above can be read-only memory, disk, or optical disk, etc.

[0028] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0029] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

[0030] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. An insulation monitoring and alarm circuit, characterized in that, The circuit, used in a frequency converter test bench, includes: The insulation tester coupler B1 is connected to the insulation monitor B2 and the input bus of the inverter under test, respectively. The insulation tester B2 is connected to the insulation tester coupler B1 via the high-voltage relay module B3, and is also connected to the control module via RS485. The control module is connected to the insulation detector B2 and the audible and visual alarm SG, respectively. The power supply module is used to supply power to the insulation detector B2, the control module, and the audible and visual alarm SG.

2. The insulation monitoring and alarm circuit as described in claim 1, characterized in that, The contacts corresponding to the high-voltage relay module are normally closed contacts.

3. The insulation monitoring and alarm circuit as described in claim 1, characterized in that, The control module is specifically connected to the audible and visual alarm SG via relays KA1, KA2, and KA3, and relay KA4 is connected to the power supply module. Relay KA4 is controlled to turn on and off via rotary switch SA1, and the contacts of relay KA4 control the power supply to and from the high-voltage relay module B3.

4. The insulation monitoring and alarm circuit as described in claim 1, characterized in that, The power module specifically includes: The input terminal of the step-down chip SG1 is connected to the terminal X1 of the 220V power supply. The first output terminal of the step-down chip SG1 is 24V+ and is connected to the terminal X2. The second output terminal of the step-down chip SG1 is 24V- and is connected to the terminal X3. The PE terminal of the step-down chip is grounded.

5. The insulation monitoring alarm circuit as described in claim 1, characterized in that, The control module is connected to the operator console of the frequency converter test bench via an EtherNET communication port.

6. The insulation monitoring alarm circuit as described in claim 3, characterized in that, The contacts of relay KA1 are connected to port 1 of the yellow flashing light HB1 in the power module and the audible and visual alarm SG, respectively. The contacts of relay KA2 are connected to port 2 of the power module and the red flashing light HB2, respectively. The contacts of relay KA3 are connected to port 3 of the power module and the buzzer in the audible and visual alarm SG, respectively. The contacts of relay KA4 are connected to port 1 of the power module and the high-voltage relay module B3, respectively.

7. The insulation monitoring and alarm circuit as described in claim 6, characterized in that, The buzzer, red flashing light HB2, and yellow flashing light HB1 are all connected to the power module.

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