CN222561722U - Alternating current insulation detection device - Google Patents

Abstract

The utility model discloses an alternating current insulation detection device which comprises a power supply module and an operating system, wherein the operating system is electrically connected to the power supply module, the operating 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, the digital and LED display module is electrically connected to the single chip microcomputer system, and 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

Alternating current insulation detection device

Technical Field

The utility model relates to the field of alternating current insulation detection tool design, in particular to an alternating current insulation detection device.

Background

The alternating current power grid insulation detection device is suitable for monitoring the ground insulation of an alternating current power grid (a power grid with neutral points not grounded and power grid with mains supply isolated by a transformer) in the fields of electric locomotives, ships, mines, metallurgy and the like.

The existing tool has the disadvantages of poor performance stability, heavy weight, complex structure, few display items, no communication function, manual recording after detection and inconvenient use.

Disclosure of utility model

The utility model aims to solve the technical problems of poor stability, heavy structure, few display items, no communication function and manual recording after detection.

In order to solve the problems, the alternating current insulation detection device comprises a power module and an operating system, wherein the operating system is electrically connected to the power module, the operating 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, 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, and the power module supplies power to the single chip microcomputer system, the sampling voltage isolation following module, the filter circuit, the injection method sampling circuit, the CAN output module, the digital and LED display module and the relay output module.

Furthermore, the digital part in the digital and LED display module adopts a 4-bit eight-section nixie tube.

Preferably, the nixie tube displays '8.8.8.8' at first, which means that the nixie tube displays normally, the two indicator lamps flash simultaneously, then the nixie tube displays '0L', the device enters a monitoring state after the two indicator lamps are extinguished simultaneously, and the nixie tube displays the insulation resistance value of the monitored power grid to the ground. When the nixie tube displays 'OL', the insulation resistance is beyond the detection range. When the system detects that the broken wire occurs, the nixie tube displays E-and two indicator lamps flash at the same time, and the two relays act at the same time.

The initial alarm value is set to be 1-100 KΩ (set value 1) and 2-500 KΩ (set value 2) in factory.

Preferably, the setting button is pressed for 3 seconds for a long time, the 1-level alarm setting state is entered, and the nixie tube displays the currently set 1-level initial alarm value. Then, every time the 'set' key is pressed, the set value is increased by 10KΩ, the increase is restarted from 10KΩ after the set value reaches 100deg.KΩ, the 'determine' key is pressed, the system enters the 2-level alarm value setting state, the nixie tube displays the currently set 2-level initial alarm value, then, every time the 'set' key is pressed, the set value is increased by 10KΩ, the increase is restarted from 100deg.KΩ after the set value reaches 500KΩ, the 'determine' key is pressed after the set value is selected, and the system enters the monitoring state again.

After the alarm value is set, the system automatically stores the set value in the built-in memory of the system (power-off hold).

The guide rail type automobile seat has the beneficial effects of small and exquisite appearance, stable performance, simple structure and guide rail installation. The novel singlechip and display chip technology are adopted, and the reading is striking and clear. The control adopts a touch type membrane switch and has a power-off maintaining function for the set value. The alarm value of the insulation resistance can be set in a grading way between 10KΩ and 500KΩ, and the method is completely suitable for low insulation alarm of a power grid under general conditions. The continuous automatic monitoring alarm device has important significance in the aspects of preventing electric fire accidents, ensuring the safe operation of the power grid, realizing automatic management and the like.

Drawings

Fig. 1 is a circuit frame diagram of a dc power grid insulation detection device according to the present utility model;

Fig. 2 is a schematic diagram of an injection method sampling circuit of a dc power grid insulation detection device according to the present utility model;

fig. 3 is a schematic view of the appearance of a host of the dc power grid insulation detection device according to the present utility model;

Fig. 4 is a schematic circuit diagram of a relay output module of the dc power grid insulation detection device according to the present utility model;

fig. 5 is a wiring diagram of a measured power grid of a dc power grid insulation detection device according to the present utility model;

FIG. 6 is a diagram of another DC network insulation detection device according to the present utility model;

fig. 7 is a functional display chart of a dc power grid insulation detection device according to the present utility model.

The system comprises a sampling voltage isolation following module, a filtering circuit, an injection sampling circuit, a CAN output module, a digital and LED display module, a relay output module and a relay output module, wherein the sampling voltage isolation following module comprises a single chip microcomputer system, an operating system, a sampling voltage isolation following module, a sampling circuit, a filtering circuit, an injection sampling circuit, a CAN output module, a digital and LED display module and an LED display module.

Detailed Description

As shown in fig. 1 to 7, the utility model is an ac insulation detection device, which comprises a power module (not shown in the drawing) and an operating system 1, wherein the operating system 1 is electrically connected to the power module, the operating system 1 comprises a single-chip microcomputer system 2, a sampling voltage isolation following module 3, a filter circuit 4, an injection 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 following module 3 is electrically connected to the single-chip microcomputer system 2, the filter circuit 4 is electrically connected to the sampling voltage isolation following module 3, the injection sampling circuit 5 is electrically connected to the filter circuit 4, the CAN output module 6 is electrically connected to the single-chip microcomputer system 2, the digital and LED display module 7 is electrically connected to the single-chip microcomputer system 2, the relay output module 8 is electrically connected to the single-chip microcomputer system 2, and the power module supplies power to the single-chip microcomputer system 2, the sampling voltage isolation following module 3, the filter circuit 4, the injection sampling circuit 5, the CAN output module 6, the digital and LED display module 7 and the relay output module 8.

The digital part in the digital and LED display module 7 adopts a 4-bit eight-section nixie tube.

When the digital tube is particularly used, the digital tube firstly displays 8.8.8.8, which means that the digital tube is normally displayed, the two indicator lamps flash simultaneously, then the digital tube displays 0L, the device enters a monitoring state after the two indicator lamps are extinguished simultaneously, and the digital tube displays the insulation resistance value of the monitored power grid to the ground. When the nixie tube displays 'OL', the insulation resistance is beyond the detection range. When the system detects that the broken wire occurs, the nixie tube displays E-and two indicator lamps flash at the same time, and the two relays act at the same time. The singlechip system is provided with a 1-level alarm and a 2-level alarm. The level 1 alarm corresponds to the level 1 alarm indicator lamp and the K1 relay, and the level 2 alarm corresponds to the level 2 alarm indicator lamp and the K2 relay. The level of the level 1 alarm is higher than the level 2 alarm (namely, the level 2 alarm state is certainly reached when the level 1 alarm state is reached, and the K1 relay, the K2 relay, the No. 1 alarm indicator lamp and the No. 2 alarm indicator lamp all act simultaneously).

The 'set' key is pressed for 3 seconds for entering a 1-level alarm setting state, and the nixie tube displays the currently set 1-level initial alarm value. Then, every time the 'set' key is pressed, the set value is increased by 10KΩ, the increase is restarted from 10KΩ after the set value reaches 100deg.KΩ, the 'determine' key is pressed, the system enters the 2-level alarm value setting state, the nixie tube displays the currently set 2-level initial alarm value, then, every time the 'set' key is pressed, the set value is increased by 10KΩ, the increase is restarted from 100deg.KΩ after the set value reaches 500KΩ, the 'determine' key is pressed after the set value is selected, and the system enters the monitoring state again. After the alarm value is set, the system automatically stores the set value in the built-in memory of the system (power-off hold).

In summary, a pulse signal with positive and negative polarities is generated and is overlapped on a monitored power grid through the L1/L2 and/KE terminals by the coupling circuit, and a signal reflecting the change of the insulation resistance to ground of the monitored power grid is received by the insulation resistance signal detection circuit, wherein the signal is returned from the coupling circuit. When the insulation resistance is lower than the system set value, the system gives an alarm, an alarm indicator light is on, and the relay acts.

It should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to specific embodiments, and that the embodiments may be combined appropriately to form other embodiments that will be understood by those skilled in the art.

Claims (2)

1. The alternating current insulation detection device is characterized by comprising a power supply module and an operating system, wherein the operating system is electrically connected to the power supply module, the operating 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, 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, and the power supply module supplies power to the single chip microcomputer system, the sampling voltage isolation following module, the filter circuit, the injection method sampling circuit, the CAN output module, the digital and LED display module and the relay output module.

2. The AC insulation detecting device as set forth in claim 1, wherein the digital part of the digital and LED display module is a 4-bit eight-segment nixie tube.