Automatic detection equipment for system stability of earth resistivity device

Abstract

The utility model discloses automatic detection equipment for system stability of a ground resistivity device, which is electrically connected with a ground resistivity measuring system and comprises a main control unit and at least two wireless wire breakers. The main control unit comprises a first single-chip microcomputer, a first wireless communication module and a first relay module. The first single-chip microcomputer is in communication connection with the first wireless communication module and the first relay module. The first relay module is electrically connected with the wireless wire breaker and comprises a first optoelectronic isolation driving circuit, a first relay and a load resistor, and the first optoelectronic isolation driving circuit drives the first relay to control the on-off of the load resistor and the wireless wire breaker. According to the utility model, the remote control of the broken line of the electrode is realized, the burden of observation device electric leakage inspection work of station workers can be reduced, the one-time detection time is shortened to be within 10 minutes, the time and manpower are greatly saved, the working efficiency is improved, all-weather line electric leakage inspection is realized, and the working efficiency is improved. And the accuracy of long-term observation data of the earth resistivity is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of earthquake prediction technology, especially a ground resistivity device system stability automatic detection equipment. BACKGROUND

[0002] At present, the ground resistivity station of forecasting earthquake in our country mostly adopts four-pole symmetry device, observation system of direct current power supply, and can be divided into two parts: one is device system, including electrode, external circuit, indoor wiring and lightning protection system, two is measurement system, including measuring instrument and power supply equipment. The measuring instrument in the measurement system mainly adopts direct current ground resistivity instrument, and direct current stabilized power supply is powered. The actual ground resistivity observation system composition is as shown in Figure 1

[0003] The main factor affecting the stability of the device system is the external circuit, because in the normal observation of the station, the position of the electrode is fixed after being buried, and will not change with time, and will not affect the stability of the observation device; the line and lightning arrester in the observation room are in the observation room, and the line is short, and will not affect the stability of the observation device, even if a fault is found and eliminated; the external circuit is exposed to the atmosphere for a long time or buried in the soil, and the power supply line and the measuring line, and the power supply line and the measuring line to the ground cannot be absolutely insulated, and the decrease of insulation degree will cause the "leakage phenomenon", resulting in the error of ground resistivity measurement result.

[0004] Now most of the stations are checked for external line leakage by manual operation. Generally, the external line and electrode lead are placed in the sealed box on the electrode buried line pole, and the connection of electrode and line is controlled by the knife switch, but since the disconnecting point is far away from the observation room (more than 1km), and the number of power supply electrodes is large (at least 4), manual disconnection of electrode not only consumes time but also is laborious, especially when the weather is bad, which is more difficult, but the bad weather is an important reason for the leakage, which needs to be checked. The station network requires at least one leakage check every quarter, due to the limitation of conditions, the leakage check is carried out when the weather condition is good, which cannot fully reflect the real situation of the observation system. For the "leakage influence" check of unattended ground station, it is more difficult.

[0005] ​ZD8T inspection device developed by Zhao Jialiao et al. in 2000 realizes remote control of electrode disconnection, greatly reduces the burden of station personnel and improves the efficiency of device system stability inspection. However, there are some problems in long-term use, for example: the AC signal used to drive the disconnector action is transmitted through the earth to form a loop, and its load capacity is related to the line resistance and the grounding resistance of the electrode. When the line resistance and the grounding resistance of the electrode are large, the DC voltage used to drive the disconnector after rectification will be small, and in this case, long-term operation will cause the disconnector to work unreliable; the high-power high-frequency signal and the DC signal are fed in parallel on the outer line, which causes large power frequency common mode and differential mode interference when measuring leakage voltage and current, resulting in increased error of the measurement result; because ZD8T inspection instrument was developed relatively early, the AC signal generation chip and power amplifier chip used have been discontinued, resulting in ZD8T inspection instrument being in a situation of shortage, affecting subsequent maintenance. SUMMARY

[0006] In order to solve the above problems, the utility model provides a kind of ground resistivity device system stability automatic detection equipment, and wireless technology is applied to the detection of seismic ground resistivity device system stability, and single-chip microcomputer control technology and LoRa wireless control module are used to develop wireless thread control disconnection device, to realize the remote control of the connection and disconnection of outer line and electrode. Compared with the original ZD8T AC and DC parallel feed method, the disconnection control is no longer completed through the earth loop of electrode, and the disconnection device is completely independent of the device system, does not interfere with the leakage detection accuracy, and is not affected by the change of electrode grounding resistance, so that it has higher reliability;Device system automatic inspection can be realized remotely and all-weather. LoRa wireless technology has the characteristics of small power, low cost, variety and strong universality, which is beneficial to the promotion and maintenance of detection equipment;Realize the remote control of ground resistivity device system stability automatic inspection, provide technical support for unattended station.

[0007] The technical scheme adopted by the utility model is as follows:

[0008] A kind of ground resistivity device system stability automatic detection equipment is electrically connected with ground resistivity measurement system, and includes main control unit and at least two wireless disconnectors;The main control unit includes first single-chip microcomputer, first wireless communication module and first relay module, and the first single-chip microcomputer is respectively connected with the first wireless communication module and the first relay module;The first wireless communication module is used for receiving and sending wireless signals;The first relay module is electrically connected with the wireless disconnector, and includes first opto-isolator drive circuit, first relay RL1 and load resistance, and the first opto-isolator drive circuit drives the first relay to control the on-off of the load resistance and power supply line.

[0009] Further, the first wireless communication module comprises a serial communication circuit and a first LORA wireless module.

[0010] Further, the wireless disconnector comprises a second single-chip microcomputer, a second wireless communication module and a second relay module, the second single-chip microcomputer is in communication connection with the second wireless communication module and the second relay module respectively; the second wireless communication module is used for receiving wireless signals; the second relay module comprises a second opto-isolating drive circuit and a second relay RL2, and the second opto-isolating drive circuit drives the second relay RL2 control electrode to be connected with or disconnected from a power supply circuit.

[0011] Further, the second wireless communication module comprises a second LORA wireless module.

[0012] Further, the first opto-isolating drive circuit and the second opto-isolating drive circuit are both transistor output photoelectric couplers.

[0013] Further, the master control unit further comprises a power supply, which is used for supplying power to the first single-chip microcomputer, the first wireless communication module and the first relay module; and the wireless disconnector comprises a power supply, which is used for supplying power to the second single-chip microcomputer, the second wireless communication module and the second relay module.

[0014] Further, the power supply of the wireless disconnector is a solar cell module.

[0015] The resistivity device system stability automatic detection equipment of the utility model innovatively applies LoRa wireless technology in the earthquake geoelectric observation system, realizes remote control of electrode disconnection, and is more effective and reliable compared with the original alternating current and direct current parallel feed technology. The equipment will reduce the burden of observation device leakage inspection work of station staff, and will complete the work quantity of original two or three people cooperation for several hours by the measurement system self-timing, shortens the detection time to within 10 minutes, greatly saves time and manpower, improves work efficiency, realizes all-weather line leakage inspection, and ensures the accuracy of geoelectric resistivity long-term observation data.

[0016] The utility model will further improve the existing geoelectric resistivity observation system, and is favorable for promoting the unattended development of earthquake geoelectric observation station. There are more than eighty geoelectric observation stations in the country, and most of the stations still manually perform leakage inspection work, and the inspection equipment has the advantages of low cost and high reliability, is more favorable for popularization in stations, and has good application prospect. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 It is a schematic diagram of the composition of the earth resistivity observation system in the prior art;

[0019] Figure 2 This is a schematic diagram of the connection of the automatic detection equipment for the stability of the georesistivity device system according to an embodiment of the present utility model;

[0020] Figure 3 for Figure 2 A schematic diagram of the structure of the main control unit in the embodiment;

[0021] Figure 4 for Figure 2 A schematic structural diagram of a wireless disconnector in an embodiment;

[0022] Figure 5 Schematic diagram of the power supply structure of the wireless disconnector. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0024] It should be noted that the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or are inherent to these processes, methods, products or apparatus.

[0025] In the present application, the terms "upper", "lower", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to indicating the orientation or positional relationship, the above-mentioned part of the terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain dependent relationship or connection relationship in some cases. For those skilled in the art, the specific meaning of these terms in the present application can be understood according to the specific circumstances.

[0026] The stability automatic detection equipment of the geoelectric resistivity device system of the embodiment is electrically connected with a geoelectric resistivity measurement system (composed of a geoelectric resistivity measurement instrument and a power supply), and includes a master control unit and at least two wireless disconnectors, as shown in the figure. Figure 2 The master control unit realizes program-controlled load resistance access to the power supply line and sends LORA wireless control signals to the outside; and the wireless disconnectors remotely control the disconnection or connection of the power supply line and the electrodes.

[0027] The stability automatic detection equipment of the geoelectric resistivity device system is connected with the geoelectric resistivity observation system, and is in a dormant state at ordinary times without affecting the normal observation of the geoelectric resistivity. When it is necessary to check the stability of the device system, the master control unit of the automatic detection equipment responds to the command of the geoelectric resistivity instrument measurement host to program-controlledly access the load resistance on the power supply line, and controls the disconnection of the connection between the electrodes and the power supply line through the wireless command control disconnector, to complete the leakage current measurement of each power supply line and the leakage voltage measurement of each direction, together with the geoelectric resistivity instrument measurement host.

[0028] The master control unit includes a first single-chip microcomputer, a first wireless communication module, and a first relay module, as shown in the figure. Figure 3 The first single-chip microcomputer is in communication connection with the first wireless communication module and the first relay module; the first wireless communication module is used for receiving and sending wireless signals; the first relay module is electrically connected with the wireless disconnector, and the first relay module includes a first opto-isolating drive circuit, a first relay RL1, and a load resistance, and the first opto-isolating drive circuit drives the first relay to control the on-off of the load resistance and the power supply line.

[0029] The main function of the master control unit is to respond to the stability checking instruction of the geoelectric resistivity instrument measurement host through a serial port or a wireless way, to control the automatic access of the load resistance to the power supply line, and to send a disconnection instruction to the wireless disconnector installed at the electrode burying point through the first wireless communication module; after the system stability checking is completed, a reset instruction is sent to the wireless disconnector, and the load resistance is disconnected from the power supply line, to restore to the normal working state of the geoelectric resistivity measurement system.

[0030] Preferably, the first wireless communication module includes a serial communication circuit and a first LORA wireless module to realize the reception and transmission of wireless signals.

[0031] Specifically, the first LORA wireless module selects a device with appropriate power according to the distance that the signal needs to be transmitted in the usage scenario. Because the wireless module of the main control unit is responsible for signal broadcasting and transmission, the power of the device is preferably 37dBm (5W), which can theoretically cover a distance of at least 15km, which can meet the needs of seismic ground resistivity device system inspection.

[0032] The first single-chip microcontroller uses the C8051 chip, using its rich I / O ports as the control terminal for relay operation and the port for receiving and sending instructions. Normally, the C8051 chip is in a dormant state. When a command is received from the host, a serial port interrupt wakes up the control core, and the C8051 recognizes the command and takes corresponding action.

[0033] The first photoelectric isolation drive circuit preferably uses a transistor output photocoupler as a relay driver. The photocoupler can effectively isolate the first single-chip microcomputer and the first relay (insulation voltage 7.5kV) to prevent high-voltage signals transmitted through the power supply line (such as high-voltage shocks such as lightning strikes) from damaging the control circuit. The device has low power consumption, with a maximum power of only 100mW. The input end can drive a circuit with a maximum voltage of 30V with a small current (maximum 60mA), and the maximum drive current can reach 150mA. The operating temperature range is -55°C to 100°C, meeting the drive current requirements of relays in automatic detection equipment (the maximum drive current of the relay used does not exceed 100mA) and the ambient temperature requirements for field georesistivity device system inspections.

[0034] When checking the stability of the device system, the DC current used is generally around 2A. Therefore, the load resistor used needs to be able to pass at least 2A of current. The resistance should be between 20Ω and 80Ω to simulate the ground resistance of the power supply electrode used in actual ground resistivity observations. (Seismic industry standards require that the ground resistance of the power supply electrode should not exceed 30Ω. Most stations do not exceed 30Ω, and even if there are some, they generally do not exceed 80Ω.) Similarly, the first relay used as the electronic switch also needs to be a device that can pass at least 2A of current.

[0035] The main control unit's power supply consists of a 40W wide-input voltage range AC / DC converter. This AC / DC converter converts 220V AC to 12V DC with a maximum current of 4.2A. This 12V voltage is divided into three paths: one path goes to the first optoelectronic isolation driver circuit as the driving power source for the first relay; the second path powers the first LoRa wireless module; and the final path is converted to 3.3V by the DC / DC converter circuit on the main control board to power the first microcontroller chip and serial communication circuit.

[0036] The main function of the wireless disconnecting device is to control the second relay RL2 to disconnect and connect the power supply line and the electrode by receiving wireless control instructions, and the working principle and internal component connection relationship are as shown in Figure 4 .

[0037] The wireless disconnecting device comprises a second single-chip microcomputer, a second wireless communication module and a second relay module, the second single-chip microcomputer is in communication connection with the second wireless communication module and the second relay module respectively; the second wireless communication module is used for receiving wireless signals; the second relay module comprises a second opto-isolating drive circuit and a second relay RL2, and the second opto-isolating drive circuit drives the second relay RL2 to control the on-off of the electrode and the power supply line.

[0038] In the embodiment, the second wireless communication module comprises a second LORA wireless module. Specifically, the second LORA wireless module realizes the reception of wireless signals and transmits the signals to the second single-chip microcomputer. The sleep function of the second LORA wireless module is utilized to make the wireless disconnecting device in an ultra-low power consumption operation mode when no working instruction is received.

[0039] The second single-chip microcomputer adopts a C8051 chip, and the rich I / O port thereof is utilized as a control port for communication with the second LORA wireless module, controlling the working mode of the second LORA wireless module and the action of the second relay.

[0040] The second opto-isolating drive circuit is the same as the first opto-isolating drive circuit in the main control unit, and preferably adopts a transistor output photoelectric coupler, which can not only meet the driving power of the second relay, but also isolate the control circuit and the power supply line to prevent the high-voltage and high-frequency signals on the power supply line from damaging the control circuit.

[0041] The power supply of the wireless disconnecting device preferably adopts solar energy storage power supply, mainly including a solar cell panel, a solar charging and discharging controller and a 12V energy storage battery. According to the power consumption of the wireless disconnecting device, a battery capacity that can support the normal work of the wireless disconnecting device for at least 20 days is selected, and a solar cell panel with a corresponding charging power according to the battery capacity is selected. The 12V battery is converted into DC 3.3V and DC 5V voltages through two wide-frequency DC / DCV conversion circuits, wherein the DC 3.3V is used for power supply of the second single-chip microcomputer chip; the DV 5V is used for power supply of the second LORA wireless module and the second opto-isolating drive circuit. As shown in Figure 5 .

[0042] It should be noted that the wireless disconnecting device in the embodiment is taken as two examples, and in fact, it can be multiple, which is arranged according to the number of power supply lines.

[0043] The above descriptions are only the preferred embodiments of the present application, and are not intended to limit the present application. The present application can have various modifications and changes for those skilled in the art. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An automatic detection device for the stability of a ground resistivity device system, electrically connected to a ground resistivity measurement system, characterized in that: It includes a main control unit and at least two wireless disconnectors; the main control unit includes a first single-chip microcomputer, a first wireless communication module and a first relay module, the first single-chip microcomputer is respectively communicated with the first wireless communication module and the first relay module; the first wireless communication module is used for receiving and sending wireless signals; the first relay module is electrically connected to the wireless disconnector, the first relay module includes a first photoelectric isolation drive circuit, a first relay RL1 and a load resistor, the first photoelectric isolation drive circuit drives the first relay to control the on / off of the load resistor and the power supply line.

2. The automatic detection device for the stability of the earth resistivity device system according to claim 1 is characterized in that: The first wireless communication module includes a serial communication circuit and a first LORA wireless module.

3. The automatic detection device for the stability of the earth resistivity device system according to claim 1 is characterized in that: The first photoelectric isolation driving circuit is a transistor output photoelectric coupler.

4. The automatic detection device for the stability of the earth resistivity device system according to claim 1 is characterized in that: The main control unit also includes a power supply for supplying power to the first single-chip microcomputer, the first wireless communication module and the first relay module.

5. The automatic detection device for the stability of the earth resistivity device system according to claim 1 is characterized in that: The wireless disconnector includes a second single-chip microcomputer, a second wireless communication module and a second relay module, wherein the second single-chip microcomputer is respectively connected to the second wireless communication module and the second relay module; the second wireless communication module is used to receive wireless signals; the second relay module includes a second photoelectric isolation drive circuit and a second relay RL2, wherein the second photoelectric isolation drive circuit drives the second relay to control the connection and disconnection of the electrode and the power supply line.

6. The automatic detection device for the stability of the earth resistivity device system according to claim 5, characterized in that: The second wireless communication module includes a second LORA wireless module.

7. The automatic detection device for the stability of a ground resistivity device system according to claim 5 or 6, characterized in that: The wireless disconnector further includes a power supply for supplying power to the second single chip microcomputer, the second wireless communication module and the second relay module.

8. The automatic detection device for the stability of a ground resistivity device system according to claim 7, characterized in that: The power source is a solar cell assembly.

9. The automatic detection device for the stability of a ground resistivity device system according to claim 8, characterized in that: The second photoelectric isolation driving circuit is a transistor output photoelectric coupler.

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