Wireless transmission line disconnection-free power transmission tower grounding resistance measuring device

Abstract

The utility model discloses a wireless transmission unwiring-free power transmission tower grounding resistance measuring device, which comprises a host and a plurality of slaves, each of the host and the slaves comprises an MCU control module, the output end of the MCU control module is connected with a signal generator module, the output end of the signal generator module is connected with a first amplification module, and the output end of the signal generator module is connected with a second amplification module. The output end of the first amplification module is connected with a power amplification module, the output end of the power amplification module is connected with a clamp-shaped voltage transformer, the output end of the clamp-shaped voltage transformer is connected with a clamp-shaped current transformer, and the output end of the clamp-shaped current transformer is connected with a filter circuit. The output end of the filter circuit is connected with a second amplification module. According to the utility model, a line-unwrapping-free tower grounding resistance rapid measurement method is adopted, the obtained voltage and current signals are subjected to filtering processing and data analysis to obtain the real part and the imaginary part of the fundamental component in the voltage and current signals, and then the grounding resistance of the measured tower is obtained through a calculation method.

Description

Technical Field

[0001] The utility model relates to the technical field of resistance measurement, in particular to a grounding resistance measuring device for a wireless transmission power tower without wire untangling. Background Art

[0002] High-voltage transmission technology is the current long-distance transmission solution for electric energy. However, with the increase in voltage levels, the cost of transmission line construction is getting higher and higher. Therefore, the safe operation of high-voltage transmission lines must be guaranteed during actual operation. Lightning accidents on lines account for a large proportion of the total lightning accidents in the power system. Lightning accidents on transmission lines will cause great damage to the power system. Qualified grounding devices can provide a discharge channel for lightning current, thereby effectively avoiding lightning tripping of transmission lines. The grounding resistance value is an important indicator to measure whether the grounding device is qualified. In order to ensure the safe and reliable operation of the grounding devices of various electrical equipment and electrical equipment, the grounding resistance value of the grounding system must be measured and checked regularly according to regulations.

[0003] According to the "Preventive Test Regulations", the grounding resistance of transmission line towers should be measured once every four years. The current tower grounding resistance measurement method requires all down-leads of the tower to be untied when measuring the tower grounding resistance, which is labor-intensive. The promotion and application of this product can realize the measurement of tower grounding resistance without untying the wires, greatly reducing the labor intensity of tower grounding resistance measurement, improving work efficiency, saving a lot of manpower, material and financial resources, and reducing the operation and maintenance costs of transmission lines. Utility Model Content

[0004] The utility model aims to provide a wireless transmission and wire-free transmission tower grounding resistance measuring device to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above purpose, the utility model provides the following technical solution: a wireless transmission and wire-free transmission tower grounding resistance measurement device, comprising:

[0006] A host and multiple slaves, wherein the host and the slaves both include an MCU control module, the output end of the MCU control module is connected to a signal generator module, the output end of the signal generator module is connected to a first amplification module, the output end of the first amplification module is connected to a power amplifier module, the output end of the power amplifier module is connected to a clamp voltage transformer, the output end of the clamp voltage transformer is connected to a clamp current transformer, the output end of the clamp current transformer is connected to a filter circuit, the output end of the filter circuit is connected to a second amplification module, the output end of the second amplification module is connected to an envelope detection, the output end of the envelope detection is connected to an A / D conversion module, the output end of the A / D conversion module is connected to the input end of the MCU control module, the connection end of the MCU control module is connected to a wireless transmission module, the input end of the MCU control module is connected to a self-test circuit and a power supply module, and the connection end of the MCU control module of the host is connected to a Bluetooth module.

[0007] Preferably, the power module is powered by a lithium-ion battery.

[0008] Preferably, the transmission end of the Bluetooth module is connected to a handheld control end, and the handheld control end is a tablet computer.

[0009] Compared with the prior art, the beneficial effects of the utility model are:

[0010] The utility model adopts a fast measurement method for the grounding resistance of a pole tower without untangling the wires, obtains the real part and the imaginary part of the fundamental wave component in the voltage and current signals by filtering and analyzing the obtained voltage and current signals, and then obtains the grounding resistance of the measured pole tower by a calculation method. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a three-dimensional structural schematic diagram of a wireless transmission and wire-free transmission tower grounding resistance measurement device proposed by the utility model;

[0012] Figure 2 This is a circuit diagram of a host circuit in a wireless transmission and wire-free transmission tower grounding resistance measuring device proposed by the utility model;

[0013] Figure 3 The utility model discloses a circuit diagram of a slave circuit in a wireless transmission and wire-free transmission tower grounding resistance measuring device.

[0014] In the figure: 1. host; 2. slave; 3. MCU control module; 4. signal generator module; 5. first amplification module; 6. power amplifier module; 7. clamp-on voltage transformer; 8. clamp-on current transformer; 9. filtering circuit; 10. second amplification module; 11. envelope detection; 12. A / D conversion module; 13. wireless transmission module; 14. self-test circuit; 15. power module; 16. Bluetooth module; 17. handheld control terminal. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0016] See also Figure 1-3 The utility model provides a technical solution: a wireless transmission and wire-free transmission tower grounding resistance measuring device, comprising:

[0017] A host 1 and multiple slaves 2, the host 1 and the slaves 2 both include an MCU control module 3, the output end of the MCU control module 3 is connected to a signal generator module 4, the output end of the signal generator module 4 is connected to a first amplification module 5, the output end of the first amplification module 5 is connected to a power amplifier module 6, the output end of the power amplifier module 6 is connected to a clamp voltage transformer 7, the output end of the clamp voltage transformer 7 is connected to a clamp current transformer 8, the output end of the clamp current transformer 8 is connected to a filter circuit 9, the output end of the filter circuit 9 is connected to a second amplification module 10, the output end of the second amplification module 10 is connected to an envelope detection 11, the output end of the envelope detection 11 is connected to an A / D conversion module 12, the output end of the A / D conversion module 12 is connected to the input end of the MCU control module 3, the connection end of the MCU control module 3 is connected to a wireless transmission module 13, the input end of the MCU control module 3 is connected to a self-test circuit 14 and a power supply module 15, and the connection end of the MCU control module 3 of the host 1 is connected to a Bluetooth module 16.

[0018] The power module 15 is powered by a lithium-ion battery and is responsible for providing the required voltage for each chip in the entire system.

[0019] The transmission end of the Bluetooth module 16 is connected to a handheld control terminal 17 , and the handheld control terminal 17 is a tablet computer.

[0020] Working principle: When the utility model is used, the host 1 and multiple slaves 2 are respectively connected to the voltage heads and current heads of multiple circuits to be tested, the signal generator module 4 sends a sinusoidal voltage signal, and the signal is amplified by the amplifier module 5, and transmitted to the clamp voltage transformer 7 through the power amplifier module 6, and the sinusoidal voltage is induced to the circuit to be tested by the clamp voltage transformer 7, and a current signal will be generated on the circuit to be tested, and then the current signal is induced by the clamp current transformer 8, and the signal is amplified by the second amplifier module 10, and the clutter is filtered out by the filter circuit 9, and the AC is converted into DC by the envelope detection 11, and the signal is sent to the MCU control module 3 through the AD conversion module 12 to realize current measurement, and then the grounding resistance value is obtained through a specific calculation method. The grounding resistance value data can be transmitted to the handheld control terminal 17 via Bluetooth, and remotely sent to the central computer by the GPRS wireless transmission module of the handheld control terminal, so as to realize the network management of grounding resistance measurement.

[0021] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0022] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A wireless transmission and wire-free transmission tower grounding resistance measurement device, characterized in that: include: A host (1) and a plurality of slaves (2), wherein the host (1) and the slaves (2) each comprise an MCU control module (3), the output end of the MCU control module (3) being connected to a signal generator module (4), the output end of the signal generator module (4) being connected to a first amplification module (5), the output end of the first amplification module (5) being connected to a power amplifier module (6), the output end of the power amplifier module (6) being connected to a clamp-type voltage transformer (7), the output end of the clamp-type voltage transformer (7) being connected to a clamp-type current transformer (8), the output end of the clamp-type current transformer (8) being connected to a filter circuit (9), the filter circuit The output end of the circuit (9) is connected to a second amplifying module (10), the output end of the second amplifying module (10) is connected to an envelope detector (11), the output end of the envelope detector (11) is connected to an A / D conversion module (12), the output end of the A / D conversion module (12) is connected to an input end of an MCU control module (3), the connection end of the MCU control module (3) is connected to a wireless transmission module (13), the input end of the MCU control module (3) is connected to a self-test circuit (14) and a power supply module (15), and the connection end of the MCU control module (3) of the host (1) is connected to a Bluetooth module (16).

2. According to claim 1, a wireless transmission and wire-free transmission tower grounding resistance measurement device is characterized in that: The power module (15) is powered by a lithium-ion battery.

3. The wireless transmission and wire-free transmission tower grounding resistance measuring device according to claim 1 is characterized in that: The transmission end of the Bluetooth module (16) is connected to a handheld control end (17), and the handheld control end (17) is a tablet computer.

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