Alternating current insulation detection device

Abstract

The utility model discloses an AC insulation detection device, comprising a power supply module and an operation system, the operation system is electrically connected with the power supply module, the operation system comprises a single-chip microcomputer system, a sampling voltage isolation following module, a filter circuit, an injection method sampling circuit, a CAN output module, a digital and LED display module and a relay output module, the sampling voltage isolation following module is electrically connected to the single-chip microcomputer system, the filter circuit is electrically connected to the sampling voltage isolation following module, the injection method sampling circuit is electrically connected to the filter circuit, the CAN output module is electrically connected to the single-chip microcomputer system, and the digital and LED display module is electrically connected to the single-chip microcomputer system. The relay output module is electrically connected to the single-chip microcomputer system. The utility model relates to the field of alternating current insulation detection tool design, in particular to an alternating current insulation detection device.

Description

Technical Field

[0001] The utility model relates to the field of AC insulation detection tool design, in particular to an AC insulation detection device. Background Art

[0002] The AC power grid insulation detection device is suitable for monitoring the insulation of the AC power grid (a power grid with an ungrounded neutral point, a power grid isolated by a transformer) in the fields of electric locomotives, ships, mining, metallurgy, etc.

[0003] The current tools have poor performance stability, are bulky, have complex structures, display few items, have no communication function, and require manual recording after detection, which is inconvenient to use. Utility Model Content

[0004] The technical problems to be solved by the utility model are poor stability, heavy weight, complex structure, few display items, no communication function, and manual recording is required after detection.

[0005] To solve the above problems, the technical solution adopted by the utility model is as follows: The utility model is an AC insulation detection device, including a power supply module and an operating system, the operating system is electrically connected to the power supply module, the operating system includes a single-chip computer system, a sampling voltage isolation follower module, a filtering circuit, an injection method sampling circuit, a CAN output module, a digital and LED display module and a relay output module, the sampling voltage isolation follower module is electrically connected to the single-chip computer system, the filtering circuit is electrically connected to the sampling voltage isolation follower module, the injection method sampling circuit is electrically connected to the filtering circuit, the CAN output module is electrically connected to the single-chip computer system, the digital and LED display module is electrically connected to the single-chip computer system, the relay output module is electrically connected to the single-chip computer system, and the power supply module supplies power to the single-chip computer system, the sampling voltage isolation follower module, the filtering circuit, the injection method sampling circuit, the CAN output module, the digital and LED display module and the relay output module.

[0006] Furthermore, the digital part of the digital and LED display module adopts a 4-digit eight-segment digital tube.

[0007] Preferably, the digital tube first displays "8.8.8.8.", indicating that the digital tube display is normal, and the two indicator lights flash at the same time, then the digital tube displays "0L", and the two indicator lights go out at the same time, and the device enters the monitoring state, and the digital tube displays the insulation resistance value of the monitored power grid to the ground. When the digital tube displays "OL", it means that the insulation resistance exceeds the detection range. When the system detects a disconnection, the digital tube displays "E---", the two indicator lights flash at the same time, and the two relays operate at the same time.

[0008] The factory setting of the alarm initial value is: Level 1 alarm - 100KΩ (setting value 1); Level 2 alarm - 500KΩ (setting value 2).

[0009] Preferably, long press the "Set" button for 3 seconds to enter the level 1 alarm setting state, and the digital tube displays the currently set level 1 initial alarm value. Subsequently, each time the "Set" button is pressed, the set value increases by 10KΩ, and after reaching 100KΩ, it starts to increase from 10KΩ again. After selecting the set value, press the "Confirm" button to enter the level 2 alarm value setting state. The digital tube displays the currently set level 2 initial alarm value. Subsequently, each time the "Set" button is pressed, the set value increases by 10KΩ, and after reaching 500KΩ, it starts to increase from 100KΩ again. After selecting the set value, press the "Confirm" button, and the system re-enters the monitoring state.

[0010] After the alarm value is set, the system automatically saves the set value in the system's built-in memory (retained after power failure).

[0011] The beneficial effects achieved by the utility model using the above structure are as follows: the product has a small and beautiful appearance, stable performance, simple structure, and rail installation. It adopts a new single-chip microcomputer and display chip technology, and the reading is eye-catching and clear. The control adopts a touch-type membrane switch, and the set value has a power-off retention function. The alarm value of the insulation resistance can be set in grades between 10KΩ and 500KΩ, which is completely suitable for low insulation alarm of the power grid under normal circumstances. This continuous automatic monitoring alarm device is of great significance in preventing electrical fire accidents, ensuring the safe operation of the power grid, and realizing automated management. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a circuit framework diagram of a DC power grid insulation detection device proposed by the utility model;

[0013] Figure 2 This is a schematic diagram of a DC power grid insulation detection device injection method sampling circuit proposed by the utility model;

[0014] Figure 3 This is a schematic diagram of the appearance of a host of a DC power grid insulation detection device proposed by the utility model;

[0015] Figure 4 This is a circuit diagram of a relay output module of a DC power grid insulation detection device proposed by the utility model;

[0016] Figure 5 A DC power grid insulation detection device proposed by the utility model is a wiring diagram of a power grid to be tested;

[0017] Figure 6 Another wiring diagram of a tested power grid of a DC power grid insulation detection device proposed by the utility model;

[0018] Figure 7 This is a function display diagram of a DC power grid insulation detection device proposed by the utility model.

[0019] Among them, 1. operating system, 2. single-chip microcomputer system, 3. sampling voltage isolation follower module, 4. filtering circuit, 5. injection method sampling circuit, 6. CAN output module, 7. digital and LED display module, 8. relay output module. DETAILED DESCRIPTION

[0020] like Figure 1 to Figure 7 As shown, the utility model is an AC insulation detection device, including a power supply module (not shown in the figure) and an operating system 1, the operating system 1 is electrically connected to the power supply module, the operating system 1 includes a single-chip computer system 2, a sampling voltage isolation follower module 3, a filter circuit 4, an injection method sampling circuit 5, a CAN output module 6, a digital and LED display module 7 and a relay output module 8, the sampling voltage isolation follower module 3 is electrically connected to the single-chip computer system 2, the filter circuit 4 is electrically connected to the sampling voltage isolation follower module 3, the injection method sampling circuit 5 is electrically connected to the filter circuit 4, the CAN output module 6 is electrically connected to the single-chip computer system 2, the digital and LED display module 7 is electrically connected to the single-chip computer system 2, the relay output module 8 is electrically connected to the single-chip computer system 2, and the power supply module supplies power to the single-chip computer system 2, the sampling voltage isolation follower module 3, the filter circuit 4, the injection method sampling circuit 5, the CAN output module 6, the digital and LED display module 7 and the relay output module 8.

[0021] The digital part of the digital and LED display module 7 adopts a 4-bit eight-segment digital tube.

[0022] When used specifically: the digital tube first displays "8.8.8.8.", indicating that the digital tube display is normal, and the two indicator lights flash at the same time, then the digital tube displays "0L", and the two indicator lights go out at the same time, and the device enters the monitoring state, and the digital tube displays the insulation resistance value of the monitored power grid to the ground. When the digital tube displays "OL", it means that the insulation resistance exceeds the detection range. When the system detects a disconnection, the digital tube displays "E---", the two indicator lights flash at the same time, and the two relays act at the same time. Level 1 alarm and level 2 alarm are set in the single-chip computer system. Level 1 alarm corresponds to the No. 1 alarm indicator and K1 relay; level 2 alarm corresponds to the No. 2 alarm indicator and K2 relay. The level of level 1 alarm is higher than that of level 2 alarm (that is, when the level 1 alarm state is reached, the level 2 alarm state has been reached for sure, and the K1 relay, K2 relay, No. 1 alarm indicator, and No. 2 alarm indicator all act at the same time).

[0023] Press and hold the "Set" button for 3 seconds to enter the 1st level alarm setting state. The digital tube displays the currently set 1st level initial alarm value. Then, each time you press the "Set" button, the set value increases by 10KΩ. After reaching 100KΩ, it will start to increase from 10KΩ again. After selecting the set value, press the "Confirm" button to enter the 2nd level alarm value setting state. The digital tube displays the currently set 2nd level initial alarm value. Then, each time you press the "Set" button, the set value increases by 10KΩ. After reaching 500KΩ, it will start to increase from 100KΩ again. After selecting the set value, press the "Confirm" button and the system will re-enter the monitoring state. After the alarm value is set, the system automatically saves the set value in the system's built-in memory (power-off retention).

[0024] In summary, a positive and negative pulse signal is generated and superimposed on the monitored power grid through the coupling circuit via the L1 / L2 and / KE terminals. The insulation resistance signal detection circuit receives the signal reflecting the change of the insulation resistance of the monitored power grid to the ground returned from the coupling circuit. When the insulation resistance is lower than the system set value, the system will sound an alarm, the alarm indicator will light up, and the relay will operate.

[0025] It should be understood that although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. An AC insulation detection device, characterized in that: It includes a power supply module and an operating system, wherein the operating system is electrically connected to the power supply module, and the operating system includes a single-chip computer system, a sampling voltage isolation follower module, a filtering circuit, an injection method sampling circuit, a CAN output module, a digital and LED display module, and a relay output module. The sampling voltage isolation follower module is electrically connected to the single-chip computer system, the filtering circuit is electrically connected to the sampling voltage isolation follower module, the injection method sampling circuit is electrically connected to the filtering circuit, the CAN output module is electrically connected to the single-chip computer system, the digital and LED display module is electrically connected to the single-chip computer system, and the relay output module is electrically connected to the single-chip computer system. The power supply module supplies power to the single-chip computer system, the sampling voltage isolation follower module, the filtering circuit, the injection method sampling circuit, the CAN output module, the digital and LED display module, and the relay output module.

2. An AC insulation detection device according to claim 1, characterized in that: The digital part of the digital and LED display module adopts a 4-bit eight-segment digital tube.

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