CN209858644U - Ground resistance monitoring equipment - Google Patents
Ground resistance monitoring equipment Download PDFInfo
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- CN209858644U CN209858644U CN201920104164.7U CN201920104164U CN209858644U CN 209858644 U CN209858644 U CN 209858644U CN 201920104164 U CN201920104164 U CN 201920104164U CN 209858644 U CN209858644 U CN 209858644U
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Abstract
The utility model discloses a ground resistance monitoring facilities, it includes communication connection's main control panel and display device, the main control panel includes main control unit and ground resistance measuring circuit, ground resistance measuring circuit includes reference voltage source, establish ties in proper order between reference voltage source and earthing terminal reference resistance and the ground resistance that awaits measuring, the voltmeter is arranged to be parallelly connected in ground resistance, main control unit is configured as, the magnitude of voltage that can gather the voltmeter and record in real time and convert magnitude of voltage into the digital signal of the resistance value of sign ground resistance, then send digital signal to display device, display device is configured as the real-time display resistance value. According to the utility model discloses a ground resistance monitoring facilities can improve measurement accuracy, reduces the long-term error that the temperature drift caused to negligible degree, still helps improving resistance measurement scope and real-time supervision ground resistance value.
Description
Technical Field
The utility model relates to a ground resistance's detection technique especially relates to a ground resistance monitoring facilities that can realize online real-time detection and show.
Background
In many conventional industrial fields, whether the grounding is good or not is closely related to safety and reliability in operation and production processes. Therefore, in many conventional industrial fields, a related device for detecting the grounding resistance is designed. For example, the conventional tank car grounding detection equipment is used for detecting the grounding resistance, but the traditional tank car grounding detection equipment can only simply judge whether the grounding resistance is qualified or unqualified, cannot accurately measure the real grounding resistance value of the tank car, and cannot timely detect and know when the tank car has the grounding resistance floating within a certain range.
The existing ground resistance measurement techniques in the industrial field are mainly classified into the following two measurement techniques. The hand-held grounding clamp has the advantages of small volume, simple use and operation and low price, but has the defects of low measurement precision, only capability of judging whether the resistance value is qualified or not, incapability of measuring the specific grounding resistance value and inconvenience for unified management. The other type is a ground resistance test station, which has the advantages of having an external signal output interface, being capable of simply linking other equipment, being capable of closing matched equipment in time and stopping operation. However, the method has the disadvantages that only the judgment of whether the grounding resistance exceeds the threshold value can be carried out, the measured grounding resistance value cannot be displayed in real time, and related monitoring and data recording cannot be carried out in other modes.
Therefore, there is a need for a new ground resistance monitoring device that eliminates the above-mentioned drawbacks of the prior art.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide an earth resistance monitoring equipment in order to overcome the not high, temperature of current earth resistance detection technique measurement accuracy that leads to the fact the error obvious, unable real-time supervision, demonstration and the specific earth resistance value's of data transmission defect.
The utility model discloses a solve above-mentioned technical problem through adopting following technical scheme:
the utility model provides a ground resistance monitoring equipment, its characteristics are, ground resistance monitoring equipment includes communication connection's main control panel and display device, the main control panel includes main control unit and ground resistance measuring circuit, ground resistance measuring circuit includes reference voltage source, series connection in proper order in reference resistance between reference voltage source and the earthing terminal and the ground resistance, the voltmeter that await measuring, the voltmeter is arranged to be parallelly connected in ground resistance;
the main controller is configured to be capable of acquiring a voltage value measured by the voltmeter in real time and converting the voltage value into a digital signal representing a resistance value of the ground resistance, and then transmitting the digital signal to the display device, and the display device is configured to display the resistance value in real time.
Preferably, the master controller has an analog-to-digital conversion sampling module, and the analog-to-digital conversion sampling module is connected to the voltmeter and is configured to convert the voltage value measured by the voltmeter into a digital signal representing the resistance value of the ground resistor.
Preferably, the reference voltage source is further connected to the analog-to-digital conversion sampling module, so as to provide a sampling reference voltage for the analog-to-digital conversion sampling module.
Preferably, the temperature drift coefficient of the reference voltage source does not exceed 5 ppm/deg.C, i.e., five parts per million per degree Celsius.
Preferably, the temperature drift coefficient of the reference resistor does not exceed 25 ppm/deg.C, i.e., twenty-five parts per million per degree Celsius.
Preferably, the main control board further comprises a data transmission interface, and the data transmission interface is an RS485 program control interface.
Preferably, the display device is provided with an LED nixie tube for displaying the resistance value, and the LED nixie tube is a light emitting diode nixie tube.
On the basis of the common knowledge in the field, the above preferred conditions can be combined at will to obtain the preferred embodiments of the present invention.
The utility model discloses an actively advance the effect and lie in:
according to the utility model discloses a ground resistance monitoring facilities can improve measurement accuracy, reduces the long-term error that the temperature drift caused to negligible degree, still helps improving resistance measurement scope and real-time supervision ground resistance value.
Drawings
Fig. 1 is a schematic diagram of a ground resistance monitoring device according to a preferred embodiment of the present invention.
Fig. 2 is a schematic circuit diagram of a ground resistance measuring circuit in the ground resistance monitoring device according to the preferred embodiment of the present invention.
Detailed Description
The following detailed description of the preferred embodiments of the present invention is provided in conjunction with the accompanying drawings, and the following description is exemplary and not intended to limit the present invention, and any other similar cases will fall within the scope of the present invention.
In the following detailed description, directional terms, such as "left", "right", "upper", "lower", "front", "rear", and the like, are used with reference to the orientation as illustrated in the drawings. The components of the various embodiments of the present invention can be positioned in a number of different orientations and the directional terminology is used for purposes of illustration and is in no way limiting.
Referring to fig. 1, according to the present invention, the ground resistance monitoring device includes a main control board and a display panel (i.e., a display device) which are connected to each other through communication, wherein the main control board includes a main controller and a ground resistance measuring circuit.
Wherein, as shown in fig. 2, the ground resistance measuring circuit comprises a reference voltage source which provides a voltage value VREFThe reference resistor R1 and the grounding resistor Rx to be measured are sequentially connected in series between the reference voltage source and the grounding end GND, and the voltmeter V in the grounding resistor measuring circuit is arranged to be connected in parallel with the grounding resistor Rx.
The main controller is configured to be capable of acquiring a voltage value measured by the voltmeter in real time, converting the voltage value into a digital signal representing a resistance value of the ground resistor, and then sending the digital signal to the display panel, wherein the display panel is configured to display the resistance value in real time.
The master controller is provided with an analog-to-digital conversion sampling module, and the analog-to-digital conversion sampling module is connected with the voltmeter and is used for converting the voltage value measured by the voltmeter into a digital signal representing the resistance value of the grounding resistor. The analog-to-digital conversion sampling module is abbreviated as ADC sampling.
According to some preferred embodiments of the present invention, the reference voltage source is further connected to the analog-to-digital conversion sampling module, so as to provide a sampling reference voltage for the analog-to-digital conversion sampling module. When the reference voltage applied to the standard resistor and the ADC sampling reference voltage are the same reference source, the initial precision error of the reference voltage can be ignored theoretically, but in practice, the influence of the initial error factor of the reference voltage source on the resistance measurement error can be minimized as much as possible after the circuit is used and is influenced by other peripheral devices.
According to some preferred embodiments of the invention, the temperature drift coefficient of the reference voltage source does not exceed 5 ppm/DEG C. From the technical parameters, when the temperature is changed in an ultra-large range of-40 ℃ to 60 ℃, the maximum error caused by the temperature drift of the reference voltage source is only 0.05 percent.
According to some preferred embodiments of the invention, the reference resistance has a temperature drift coefficient of not more than 25 ppm/DEG C. From the technical parameters, the maximum error caused by the temperature drift of the reference resistor is only 0.25 percent when the temperature is changed in an overlarge range of-40 to 60 ℃.
Further preferably, considering that the initial error of the standard resistor can only be performed by calibration, but is not beneficial to large-scale production, it is obviously more important to select a resistor with higher initial accuracy, and a later complicated calibration process can be avoided. The choice for higher cost performance is a standard resistor with 300 Ω resistance, 0.1% accuracy, and 25 ppm/deg.C temperature drift coefficient, which can maintain higher accuracy in the overall sampling process.
According to some preferred embodiments of the present invention, the main control panel further comprises a data transmission interface, the data transmission interface is an RS485 unit, i.e., an RS485 program-controlled interface. Thereby, the reliability of communication with the external device can be improved.
According to some preferred embodiments of the utility model, display panel has and is used for showing the LED charactron of resistance value to and operating condition pilot lamp and communication status pilot lamp, so as to give the clear and definite suggestion of operation personnel, and be convenient for real time monitoring ground resistance.
Preferably, the data interaction between the main control panel and the display panel adopts a serial transmission mode, which is beneficial to reducing the number of connecting wires and facilitating production and installation.
According to some preferred embodiments of the present invention, the main controller may further transmit a series of ground resistance values obtained by monitoring to an external unit for information storage. Optionally, the main controller may be further configured to drive an external buzzer to sound an alarm and drive associated relays in the monitored associated equipment to shut off to suspend the associated equipment from continuing to operate in the event of an unacceptable grounding condition.
Although particular embodiments of the present invention have been described above, it will be appreciated by those skilled in the art that these are examples only and that the scope of the present invention is defined by the appended claims. Various changes and modifications to these embodiments can be made by those skilled in the art without departing from the spirit and the principles of the present invention, and these changes and modifications all fall within the scope of the present invention.
Claims (7)
1. The ground resistance monitoring equipment is characterized by comprising a main control board and a display device which are in communication connection, wherein the main control board comprises a main controller and a ground resistance measuring circuit, the ground resistance measuring circuit comprises a reference voltage source, a reference resistor, a ground resistance to be measured and a voltmeter, the reference resistor, the ground resistance to be measured and the voltmeter are sequentially connected between the reference voltage source and a ground terminal in series, and the voltmeter is arranged to be connected in parallel with the ground resistance;
the main controller is configured to be capable of acquiring a voltage value measured by the voltmeter in real time and converting the voltage value into a digital signal representing a resistance value of the ground resistance, and then transmitting the digital signal to the display device, and the display device is configured to display the resistance value in real time.
2. The ground resistance monitoring device of claim 1, wherein the master controller has an analog-to-digital conversion sampling module connected to the voltmeter and configured to convert a voltage value measured by the voltmeter into a digital signal indicative of the resistance value of the ground resistance.
3. The ground resistance monitoring device of claim 2, wherein the reference voltage source is further connected to the analog-to-digital conversion sampling module to provide a sampled reference voltage to the analog-to-digital conversion sampling module.
4. The ground resistance monitoring device of claim 1, wherein the reference voltage source has a temperature drift coefficient of no more than 5ppm/° c.
5. The ground resistance monitoring device of claim 1, wherein the reference resistance has a temperature drift coefficient of no more than 25ppm/° c.
6. The ground resistance monitoring device of claim 1, wherein the main control board further comprises a data transmission interface, the data transmission interface being an RS485 programmable interface.
7. The ground resistance monitoring device according to claim 1, wherein the display means has an LED nixie tube for displaying the resistance value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920104164.7U CN209858644U (en) | 2019-01-22 | 2019-01-22 | Ground resistance monitoring equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920104164.7U CN209858644U (en) | 2019-01-22 | 2019-01-22 | Ground resistance monitoring equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209858644U true CN209858644U (en) | 2019-12-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920104164.7U Active CN209858644U (en) | 2019-01-22 | 2019-01-22 | Ground resistance monitoring equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209858644U (en) |
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2019
- 2019-01-22 CN CN201920104164.7U patent/CN209858644U/en active Active
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