CN211478600U

CN211478600U - Grounding state detection device

Info

Publication number: CN211478600U
Application number: CN201921778078.0U
Authority: CN
Inventors: 张庭炎; 谭海军; 袁明福; 夏玫
Original assignee: Shenzhen Launch Technology Co Ltd
Current assignee: Shenzhen Launch Technology Co Ltd
Priority date: 2019-10-22
Filing date: 2019-10-22
Publication date: 2020-09-11
Anticipated expiration: 2029-10-22

Abstract

The utility model provides a ground connection state detection device, ground connection state detection device is applicable to neutral conductor and earth connection on same power network, including collection module and monitoring module, collection module includes biasing power, switch, resistance and current transformer, biasing power's negative pole is connected the neutral conductor, biasing power's positive pole the switch resistance with current transformer establishes ties in proper order, the earth connection with current transformer establishes ties, monitoring module with the switch current transformer connects. The detection of the grounding state of the grounding wire is realized by using the isolation power supply, the current of the grounding wire is measured in an isolation mode, so that the measurement loop is completely isolated from the power supply grounding wire loop, the high safety and stability are achieved, the accuracy of the acquired data is high, the cost is low, the size is small, the use is simple, and the structure is compact.

Description

Grounding state detection device

Technical Field

The utility model relates to a circuit fault detects technical field, especially relates to a ground connection state detection device.

Background

At present, there is the blind spot in the ground connection state monitoring of earth connection in the market, often when earth connection and neutral conductor ground connection simultaneously, has the state that whether the monitoring can not go out the earth connection, simultaneously because there is the variety in the structural mounting of earth connection, whether the earth connection is correct access earth mat has uncertain factor.

In many designs and constructions, the grounding wire must be well connected to the grounding grid, but in practice, whether the grounding wire is correctly connected to the grounding grid cannot be accurately judged.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention has been made to provide a ground state detection device that overcomes or at least partially solves the above-mentioned problems.

In order to solve the problem, the utility model discloses a ground connection state detection device, ground connection state detection device is applicable to neutral conductor and earth connection on same power network, including collection module and monitor module, collection module includes biasing power, switch, resistance and current transformer, the negative pole of biasing power is connected the neutral conductor, the positive pole of biasing power the switch resistance with current transformer establishes ties in proper order, the earth connection with current transformer establishes ties, monitor module with the switch current transformer connects.

Furthermore, the monitoring module comprises a singlechip for collecting a grounding state, a relay and an acousto-optic alarm unit, and the singlechip, the relay and the acousto-optic alarm unit are sequentially connected.

Further, the monitoring module is communicated with the acquisition module through RS 485.

Furthermore, the monitoring module also comprises a wireless communication interface, and the monitoring module can communicate with the acquisition module in a wireless communication mode.

Further, the sound and light alarm unit comprises a buzzer and an LED lamp which are connected in sequence.

Further, the monitoring module further comprises a display for displaying the connection state of the grounding wire.

Further, the monitoring module further comprises a key for inputting data.

Further, the monitoring module further comprises a data storage for recording the connection state of the grounding wire.

Further, the current transformer is connected to the grounding wire in an open loop mode.

The utility model discloses a following advantage: the detection of the grounding state of the grounding wire is realized by using the isolation power supply, the current of the grounding wire is measured in an isolation mode, so that the measurement loop is completely isolated from the power supply grounding wire loop, the high safety and stability are achieved, the accuracy of the acquired data is high, the cost is low, the size is small, the use is simple, and the structure is compact.

Drawings

Fig. 1 is a block diagram of an acquisition module according to the present invention;

fig. 2 is a block diagram of a ground fault detection apparatus of the present invention.

1 bias power supply, 2 switches, 3 resistors, 4 current transformers, 5 single-chip microcomputers, 6 displays, 7RS485 interfaces, 8 wireless communication interfaces, 9 acousto-optic alarm units, 10 relays and 100 monitoring modules

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.

The utility model discloses an one of the core design lies in, provides a ground connection state detection device, and ground connection state detection device is applicable to neutral conductor (N line) and earth connection (PE line) on same power network, including collection module and monitor module 100, collection module includes biasing power supply 1, switch 2, resistance 3 and current transformer 4, neutral conductor (N line) are connected to biasing power supply 1's negative pole, biasing power supply 1's positive pole, switch 2, resistance 3 and current transformer 4 establish ties in proper order, earth connection (PE line) and current transformer 4 establish ties, monitor module 100 and switch 2, current transformer 4 are connected. The detection of the grounding state of the grounding wire (PE wire) is realized by using the isolation power supply, and the current of the grounding wire (PE wire) is measured in an isolation mode, so that the measurement loop is completely isolated from the power supply grounding wire loop, and the device has the advantages of higher safety and stability, high accuracy of acquired data, low cost, small volume, simplicity in use and compact structure.

Referring to fig. 1-2, the utility model discloses a ground connection state detection device is proposed, ground connection state detection device is applicable to neutral conductor (N line) and earth connection (PE line) on same power network, specifically can include: collection module and monitoring module 100, collection module includes bias power supply 1, switch 2, resistance 3 and current transformer 4, and neutral conductor (N line) is connected to bias power supply 1's negative pole, and bias power supply 1's positive pole, switch 2, resistance 3 and current transformer 4 establish ties in proper order, and earth connection (PE line) and current transformer 4 establish ties, and monitoring module 100 is connected with switch 2, current transformer 4.

In this embodiment, the neutral line (N line) and the ground line (PE line) are the same power network, and the power source and the ground line can form a loop and generate current on the ground line, therefore, a bias power source 1 is added to the neutral line (N line) to connect the negative electrode of the bias power source 1 to the neutral line (N line), the positive electrode of the bias power source 1 is connected with the ground line (PE line) after being connected with a resistor 3 in series, so that current can appear on the ground line (PE line), the current on the ground line (PE line) is collected by a current transformer 4, the ground line (PE line) passes through the current transformer 4, the current is collected by an electromagnetic isolation way, so as to judge the grounding state of the ground line (PE line), when the current transformer 4 detects current, the grounding state of the ground line (PE line) is good, when the current transformer 4 does not detect current, indicating no current loop. The monitoring module 100 monitors the data of the current transformer 4, and realizes monitoring of the grounding state of the grounding wire (PE wire) in a linkage manner.

In this embodiment, the monitoring module 100 includes a single chip 5, a relay 10 and an acousto-optic warning unit 9, which collect a ground state, and the single chip 5, the relay 10 and the acousto-optic warning unit 9 are connected in sequence. In the embodiment, the single chip microcomputer 5 is used for collecting the grounding state, the acousto-optic alarm unit 9 is provided, the relay 10 is used for outputting an alarm result in a linkage manner, when the grounding wire is disconnected, the acousto-optic alarm unit 9 generates alarm feedback abnormity, and the state of the relay 10 is turned over; when the ground wire is well connected, the sound and light alarm unit 9 feeds back normally, and the relay 10 does not turn over. The embodiment is characterized by isolated acquisition, safety, reliability, simple and stable circuit, high acquisition accuracy, low cost, small volume, simple use and compact structure.

In this embodiment, the monitoring module 100 communicates with the acquisition module via an RS485 interface 7. With RS485 interface 7 communication, RS485 is a standard defined to balance the electrical characteristics of drivers and receivers in digital multipoint systems, which is defined by the telecommunications industry association and the electronics industry alliance. The digital communication network using the standard can effectively transmit signals under long-distance conditions and in environments with large electronic noise. RS485 enables the configuration of inexpensive local networks and multi-drop communication links. Parameters such as the ground wire connection state and the communication address can be read through the RS485 interface 7, and an external monitoring system can be accessed to realize online monitoring of the ground wire connection state.

In this embodiment, the monitoring module 100 further includes a wireless communication interface 8, and the monitoring module 100 can communicate with the acquisition module in a wireless communication manner. In practical applications, when wired communication is limited, communication may be performed through a wireless interface, for example, RARA, WIFI, ZIGBEE, 2G, 3G, 4G, or the like, so as to perform networking or access to a public network. Realizing the unimpeded communication of various modes.

In this embodiment, the sound and light alarm unit 9 includes a buzzer and an LED lamp connected in sequence. In the embodiment, the single chip microcomputer 5 is used for collecting the grounding state, the acousto-optic alarm unit 9 is arranged, and the output is linked through the relay 10 and the RS485 output. When the grounding wire is disconnected, the buzzer sounds while the LED lamp is red and normally on, and the state of the relay 10 is turned over; when the ground wire is well connected, the buzzer does not sound, the LED displays green, and the relay 10 does not turn over. In the scheme, the current of the grounding wire is monitored by using a mode of isolating the power supply, so that the measurement loop is completely isolated from the power supply grounding wire loop, and the method has higher safety and stability.

In the present embodiment, the monitoring module 100 further includes a display 6 for displaying the connection state of the ground line. The display function can visually and conveniently observe the connection state of the grounding wire.

In this embodiment, the monitoring module 100 further includes a key for inputting data.

In this embodiment, the monitoring module 100 further includes a data storage for recording the connection state of the ground line. The present embodiment includes a data memory for storing recorded data, recording the time when the connection state of the ground line changes, and adopting a plurality of recording methods such as a timer recording.

In the present embodiment, the current transformer 4 is connected to the ground line in an open loop.

The ground wire and the neutral wire are connected to the equipment port of the ground state detection device in the embodiment, the circuit on-off states of the bias power supply 1 and the ground wire are further controlled through the control switch 2, alternating current is generated, the current on the ground wire is collected through the current transformer 4, the current value on the ground wire is collected through the RS485 interface 7, and whether to give an alarm or not is judged. The current of measuring the earth connection is carried out through adopting the mode of keeping apart to this embodiment, makes measurement return circuit and power ground return circuit keep apart completely, possesses higher security and stability, and the data accuracy degree of collection is high, and is with low costs, small, simple to use, compact structure.

Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.

The above has introduced the detailed description of the grounding state detection device provided by the present invention, and the detailed examples are applied herein to explain the principles and embodiments of the present invention, and the descriptions of the above embodiments are only used to help understand the method and core ideas of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the specific implementation and application scope, to sum up, the content of the present specification should not be understood as the limitation of the present invention.

Claims

1. The utility model provides a ground connection state detection device, its characterized in that, ground connection state detection device is applicable to neutral conductor and earth connection on same power network, including collection module and monitoring module, collection module includes biasing power, switch, resistance and current transformer, biasing power's negative pole is connected the neutral conductor, biasing power's positive pole the switch resistance with current transformer establishes ties in proper order, the earth connection with current transformer establishes ties, monitoring module with the switch current transformer connects.

2. The grounding state detection device of claim 1, wherein the monitoring module comprises a single chip microcomputer for collecting the grounding state, a relay and an acousto-optic alarm unit, and the single chip microcomputer, the relay and the acousto-optic alarm unit are connected in sequence.

3. The ground condition detection device of claim 2, wherein the monitoring module communicates with the acquisition module via RS 485.

4. The device of claim 2, wherein the monitoring module further comprises a wireless communication interface, and the monitoring module can communicate with the acquisition module via wireless communication.

5. The ground state detection device according to claim 2, wherein the audible and visual alarm unit includes a buzzer and an LED lamp connected in series.

6. The ground condition detection device according to claim 2, wherein the monitoring module further includes a display for displaying a ground wire connection state.

7. The ground condition detection device of claim 2, wherein the monitoring module further comprises a key for inputting data.

8. The ground condition detection device of claim 2, wherein the monitoring module further comprises a data memory for recording the connection status of the ground wire.

9. The ground state detection device of claim 1, wherein the current transformer is open-loop connected to the ground line.