CN212207554U

CN212207554U - Full-automatic digital multi-point grounding loop polling monitoring system

Info

Publication number: CN212207554U
Application number: CN202020061583.XU
Authority: CN
Inventors: 姜明
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-01-10
Filing date: 2020-01-10
Publication date: 2020-12-22
Anticipated expiration: 2030-01-10

Abstract

The utility model discloses a full-automatic digital multipoint earthing loop polling monitoring system, belong to the monitoring field, including a plurality of parallelly connected detection point positions, detect switching circuit, monitor and power supply circuit, it includes a plurality of parallelly connected controllable switches to detect switching circuit, controllable switch and detection point position establish ties one by one, the monitor includes programmable treater, sampling measurement circuit and warning circuit, the treater respectively with detect switching circuit, sampling measurement circuit and warning circuit electric connection, the treater control detects switching circuit and switches controllable switch, sampling measurement circuit is connected with the output that detects switching circuit, send sampling detection data for the treater, send the display screen after the treater calculation processing, visual display monitoring data. The monitor controls the detection switching circuit to circularly switch the detection point position lines to be detected, all the detection point positions are checked one by one, the point positions are clearly indicated for abnormal lines, and the difficulty of troubleshooting can be reduced.

Description

Full-automatic digital multi-point grounding loop polling monitoring system

Technical Field

The utility model relates to a ground connection detects technical field, especially indicates a full-automatic digital multiple spot ground connection return circuit round inspection monitoring system.

Background

In oil, gas, dust, gas and other inflammable and explosive operation places, such as: gas stations, coal mines, powder spraying workshops and the like, and explosion accidents caused by static electricity are rare. The dust oil gas explosion is avoided, the high-efficiency and quick static electricity release is an important and effective way, the static electricity in the objects such as machinery, electricity, human bodies and even air is released to the ground through the leading-out end point of the grounding net, and the good grounding effect is very important.

The grounding resistance is generally considered to be less than 4 ohms, and can be considered to be safe under various environmental requirements.

In fact, whether the grounding condition is good or not includes two aspects:

1) the grounding resistance formed by the grounding point of the building is arranged;

2) and a connection loop outside the leading-out end of the grounding grid.

According to building specifications, when buildings (including various industrial and civil buildings) are designed and built, grounding wire nets are preset, and grounding terminals are reserved at proper positions for safe use of grounding protection in the building range. The size of the grounding resistance depends on the structural material and the installation mode of the grounding device.

In general, the ground resistance value of a ground terminal of a building is relatively stable over time, and although the ground resistance changes little with time due to aging corrosion of a ground material and changes in soil composition, no sudden change occurs (except for a fracture failure). If this happens, it is not the problem of grounding a single working point, but rather the problem of grounding the entire building.

Therefore, as long as the ground resistance device is good, the resistance value is still within the usable range, and the lead terminal is in good contact, it is not practical to detect and monitor the ground resistance value.

Reliable will need to use safe grounded equipment (such as table surface, workstation) overlap joint on ground terminal, prevent or discover as early as possible because of the problem of interconnecting link, make this website break away from with ground terminal's being connected, perhaps lead to loop resistance too big because of contact failure, seriously influence ground effect, make the earth connection can not play effective safety protection effect, seriously influence equipment, factory building environment and even personal safety, this is the key of problem.

The common detection mode of the current grounding loop is to use a special grounding system detection alarm to carry out one-to-one single-point detection, and if multi-point detection is needed, the monitoring points are usually connected in parallel at multiple points and then the single-point detection is carried out. The problems with this approach are: because of the parallel connection of the lines, the data displayed by the measuring instrument is a multi-path parallel numerical value which loses the practical significance; it is likely that the parallel numerical value does not reflect the true condition of the line fault. Moreover, once the instrument gives an alarm, which path is failed cannot be immediately judged, and the fully parallel lines need to be checked, so that the difficulty and time for troubleshooting are increased.

SUMMERY OF THE UTILITY MODEL

The utility model provides a full-automatic digital multiple spot ground connection return circuit wheel inspection monitoring system, after the malfunction alerting appears in the system, can directly show trouble circuit, need not to investigate full parallel circuit, to the clear indication position of unusual circuit, can reduce the degree of difficulty of troubleshooting.

The technical scheme of the utility model is realized like this:

a full-automatic digital multipoint grounding loop polling monitoring system comprises a plurality of parallel detection point positions, a detection switching circuit, a monitor and a power circuit, wherein the detection switching circuit, the monitor and the detection point positions are connected with the detection point positions, the power circuit supplies power for the monitor and the detection point positions respectively, the detection switching circuit comprises a plurality of parallel controllable switches, the controllable switches are connected with the detection point positions in series one by one, the monitor comprises a processor, a sampling measurement circuit and an alarm circuit which can be programmed according to requirements, the processor is electrically connected with the detection switching circuit, the sampling measurement circuit and the alarm circuit respectively, the processor controls the detection switching circuit to switch the controllable switches, the sampling measurement circuit is connected with the output end of the detection switching circuit and sends sampling detection data to the processor, and the processor calculates and processes the sampling detection data, and sending the detection result to a display to display, and sending an alarm control signal to the alarm circuit.

As a preferred embodiment of the utility model, the monitor includes the casing, fixes circuit control panel in the casing with fix housing surface's display screen, treater, sampling measurement circuit and warning circuit are fixed on the circuit control panel, the treater with display screen electric connection.

As a preferred embodiment of the present invention, the display screen is a touch display screen.

As a preferred embodiment of the utility model, the monitor still includes remote network communication circuit, with treater electric connection will sample the detection data transmission and give long-range host computer.

As a preferred embodiment of the present invention, the apparatus further comprises an analog-to-digital conversion circuit, the output end of the detection switching circuit is electrically connected to the analog-to-digital conversion circuit, and the analog-to-digital conversion circuit is electrically connected to the processor.

As a preferred embodiment of the present invention, the input power of the power circuit is 220V ac power, and outputs one path of dc voltage to the monitor and the other path of dc voltage to the common terminal of the detection point.

The beneficial effects of the utility model reside in that: the monitor controls the detection switching circuit to switch the detection point position lines to be detected, normal or abnormal display is carried out on all detection point positions one by one, the full parallel lines do not need to be checked, the point positions are clearly indicated for the abnormal lines, and the difficulty of troubleshooting can be reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 is a schematic wiring diagram of an embodiment of a full-automatic digital multi-point grounding loop polling monitoring system of the present invention;

fig. 2 is the utility model relates to a full-automatic digital multiple spot ground circuit wheel inspection monitoring system's schematic diagram.

In the figure, 1-detection switching circuit; 2-a processor; 3-a sampling measurement circuit; 4-an alarm circuit; 5-switching the drive circuit; 6-a digital-to-analog conversion circuit; 7-a display screen; 8-a remote network communication circuit; 9-power supply circuit.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

As shown in fig. 1 and fig. 2, the utility model provides a full-automatic digital multipoint grounding loop polling monitoring system, which comprises a plurality of detection positions connected in parallel, a detection switching circuit 1 connected with the detection positions, a monitor and a power circuit 9, wherein the power circuit 9 supplies power to the monitor and the detection positions respectively, the detection switching circuit 1 comprises a plurality of controllable switches connected in parallel, the controllable switches are connected with the detection positions in series one by one, the monitor comprises a processor 2, a sampling measuring circuit 3 and an alarm circuit 4, the processor 2 is electrically connected with the detection switching circuit 1, the sampling measuring circuit 3 and the alarm circuit 4 respectively, the processor 2 controls the detection switching circuit 1 to switch the controllable switches, the sampling measuring circuit is connected with the output end of the detection switching circuit, the sampling detection data is sent to the processor 2, after the processor 2 calculates and processes the sampling detection data, and sending the detection result to a display for visual display, and sending an alarm control signal to the alarm circuit 4 if the fault signal exists.

The processor 2 can adopt SCM (single chip microcomputer) or PLC (programmable logic controller) and other control units containing CPU (central processing unit) and programmable software, and the model is selected by technicians according to user requirements in a self-defining way. Each detection point can be connected with a detection power supply, a current-limiting resistor, a common grounding wire and a grounding point lead to form a current loop through a selector switch, and the system can read the numerical value of the grounding resistor by monitoring the grounding point and the common grounding wire; the number of the detection points can be set to be N according to the field requirement. The processor 2 may control the closing of the respective controllable switches by means of a switching drive circuit 5.

The detection switching circuit 1 gates a certain detection point and the sampling measurement circuit 3 according to a program time sequence, only one path is gated at a certain time, and the others are in a disconnected state. The sampling measurement circuit 3 and the formed monitoring point peripheral circuit form a sampling loop, and indirect measurement of the grounding resistance value is realized in a current-voltage conversion mode. The digital-to-analog conversion circuit 6 converts the analog quantity data acquired by the sampling circuit into a digital quantity.

The monitor includes the casing, fixes the circuit control panel in the casing and fixes display screen 7 on the casing surface, and treater 2, sampling measurement circuit 3 and alarm circuit 4 welded fastening are on the circuit control panel, treater 2 and 7 electric connection of display screen. The display 7 is a touch display 7. The circuit control board passes through the screw fixation in the casing, and touch display screen 7 is used for realizing man-machine interaction operation, inputs necessary data through the screen: a ground resistance alarm threshold; sampling a switching interval time; a line resistance compensation value; if necessary, the relevant monitoring points are switched on or off; one key eliminates the alarm sound and light. And real-time display of detection data of the detection points is realized. Dynamically and vividly displaying each point detection value in a histogram form, and distinguishing states (safety, early warning and alarming) of monitoring data by different colors; meanwhile, the numerical value of the grounding resistance is accurately displayed in a decimal number form, and the displayed resistance number can be accurate to one percent. And the point location line of numerical value over-value alarm is accurately displayed, so that faults can be conveniently and quickly checked. And the historical alarm records can be conveniently and quickly inquired.

The monitor also comprises a remote network communication circuit 8 which is electrically connected with the processor 2 and sends the sampling detection data to a remote upper computer. The remote network communication circuit 8 can be used as a data transmission interface for large-scale cluster monitoring, and an RS485 serial port protocol is adopted.

The input power supply of the power supply circuit 9 is a 220V alternating current power supply, one path of direct current voltage is output to the monitor, and the other path of direct current voltage is output to the common end of the detection point. The mains supply (AC220V) is subjected to a series of processing such as voltage reduction, rectification, voltage stabilization and the like, and then supplies power to each module part by two voltages of DC24V and DC12V respectively.

The monitor controls the detection switching circuit 1 to switch the detection point position lines to be detected, and inspects all detection point positions one by one without inspecting all parallel lines, thereby reducing the difficulty of troubleshooting and shortening the maintenance time.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a full-automatic digital multiple spot ground connection return circuit round of inspection monitoring system, including a plurality of parallelly connected check points, with detection switching circuit, monitor and power supply circuit that the check points is connected, power supply circuit is monitor and check points power supply, its characterized in that respectively: the utility model discloses a monitor, including the monitor, detect switching circuit, monitor, sampling measurement circuit, warning circuit, sampling measurement data, processor, data processing, the detection switching circuit includes a plurality of parallelly connected controllable switches, controllable switch establishes ties with the detection position one by one, the monitor includes treater, sampling measurement circuit and the warning circuit that can program as required, the treater respectively with detect switching circuit, sampling measurement circuit and warning circuit electric connection, the treater control detect switching circuit and switch controllable switch, sampling measurement circuit with detect switching circuit's output and connect, send the sampling detection data give the treater, the treater is with the sampling detection data calculation processing back, sends and shows the testing result for the demonstration, and sends the warning control signal and give warning circuit.

2. The fully automatic digital multipoint earthing loop polling monitoring system according to claim 1, characterized in that: the monitor comprises a shell, a circuit control board fixed in the shell and a display screen fixed on the surface of the shell, wherein a processor, a sampling and measuring circuit and an alarm circuit are fixed on the circuit control board, and the processor is electrically connected with the display screen.

3. The fully automatic digital multipoint earthing loop polling monitoring system according to claim 2, characterized in that: the display screen is a touch display screen.

4. The fully automatic digital multipoint earthing loop polling monitoring system according to claim 1, characterized in that: the monitoring instrument further comprises a remote network communication circuit which is electrically connected with the processor and can send sampling detection data to a remote upper computer.

5. The fully automatic digital multipoint earthing loop polling monitoring system according to claim 1, characterized in that: the output end of the detection switching circuit is electrically connected with the analog-to-digital conversion circuit, and the analog-to-digital conversion circuit is electrically connected with the processor.

6. The fully automatic digital multipoint earthing loop polling monitoring system according to claim 1, characterized in that: the input power supply of the power supply circuit is a 220V alternating current power supply, one path of direct current voltage is output to the monitor, and the other path of direct current voltage is output to the common end of the detection point.