CN211979046U

CN211979046U - Grounding device shunting vector test system based on GPS and wireless synchronization technology

Info

Publication number: CN211979046U
Application number: CN202020076027.XU
Authority: CN
Inventors: 阮国江; 章云峰; 蔡建国; 管斌
Original assignee: Hangzhou Beihe Electric Power Technology Co ltd
Current assignee: Hangzhou Beihe Electric Power Technology Co ltd
Priority date: 2020-01-15
Filing date: 2020-01-15
Publication date: 2020-11-20
Anticipated expiration: 2030-01-15

Abstract

The utility model discloses a earthing device reposition of redundant personnel vector test system based on GPS and wireless synchronization technique, including host computer, reposition of redundant personnel vector test module and wireless communication module, through wireless communication module electric connection between host computer and the reposition of redundant personnel vector test module. This earthing device reposition of redundant personnel vector test system based on GPS and wireless synchronization technique introduces the counterpoise reposition of redundant personnel vector and measures, correct the current situation that has the inaccurate measurement of reposition of redundant personnel route counterpoise, this measurement system obtains accurate zero phase time stamp through the accurate second pulse of GPS and zero cross detection circuit, thereby obtain accurate reposition of redundant personnel vector phase angle, solve some problems of reposition of redundant personnel measurement system phase angle deviation, reposition of redundant personnel measurement easy operation, do not need extra frequency-selecting current voltmeter cooperation, just can accomplish the measurement and the data record of each reposition of redundant personnel point, adopt frequency conversion interference killing feature, the interference killing feature is strong, the measuring result is stable.

Description

Grounding device shunting vector test system based on GPS and wireless synchronization technology

Technical Field

The utility model relates to a test system specifically is a earthing device reposition of redundant personnel vector test system based on GPS and wireless synchronization technique.

Background

The working condition of the large-scale grounding grid is directly related to personal safety and safe operation of power equipment and a power system. The problems are not easy to expose because the ground net can be corroded, damaged and broken in long-term operation. Therefore, monitoring of the condition of the operating grid should be appreciated and enhanced, otherwise serious consequences may result.

The ground impedance value is an important performance parameter of a large-scale ground network, and generally, a pilot frequency alternating current signal is injected into the ground network and flows through a current line, a current pole, the ground and a current loop formed by the ground network. However, some overhead towers exist on the site, lightning protection equipment and the like are electrically connected with the grounding grid, part of test current flows out (shunted) through the metal components, the current actually passing through the grounding grid is smaller than the test current, and if the Z ═ U/I is calculated at the moment, the impedance value is smaller than the actual value. Although a ground network shunt vector testing method disclosed in patent CN201320143557 adds a shunt current value and a phase angle to ground resistance calculation, because the 4G network is used for calculating time and transmitting vector values, a 4G public network has instability, and especially some ground networks to be tested are often located in remote areas, network signals are not ideal, or a large delay exists, so that the phase angle measurement is inaccurate, so that the final calculation has a certain error or even a larger error than that generated when shunt measurement is not added, and therefore, a ground device shunt vector testing system based on GPS and wireless synchronization technology is provided.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a earthing device reposition of redundant personnel vector test system based on GPS and wireless synchronization technique to solve the problem that proposes in the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: a grounding device shunt vector test system based on GPS and wireless synchronization technology comprises a host, a shunt vector test module and a wireless communication module, wherein the host and the shunt vector test module are electrically connected through the wireless communication module, the host consists of a current transformer, a host current signal filtering module, a host signal direction module, a host ADC acquisition module, a host GPS second pulse module, a host alternating current zero crossing detection module, a host communication module and a host CPU processing module, an input pin of the host CPU processing module is electrically connected with an output pin of the host ADC acquisition module, an input pin of the host ADC acquisition module is electrically connected with an output pin of the host signal direction module, an input pin of the host signal direction module is electrically connected with an output pin of the host current signal filtering module, an input pin of the host current signal filtering module is electrically connected with an output pin of the current transformer, the input pin of the host CPU processing module is electrically connected with the output pins of the host GPS second pulse module, the host alternating current zero-crossing detection module and the host communication module, and the input pin of the host communication module is electrically connected with the output pin of the host CPU processing module;

the shunt vector testing module consists of a flexible open Rogowski coil, a signal filtering module, a signal amplifying module, an ADC (analog to digital converter) acquisition module, a pilot frequency signal extraction module, a shunt measurement display module, a GPS (global positioning system) pulse module, an alternating current zero crossing module, a communication module and a CPU (central processing unit) processing module, wherein an input pin of the CPU processing module is electrically connected with an output pin of the pilot frequency signal extraction module, an input pin of the pilot frequency signal extraction module is electrically connected with an output pin of the ADC acquisition module, an input pin of the ADC acquisition module is electrically connected with an output pin of the signal amplifying module, an input pin of the signal amplifying module is electrically connected with an output pin of the signal filtering module, an input pin of the signal filtering module is electrically connected with an output pin of the flexible open Rogowski coil, and an output pin of the CPU processing module is, the input pin of the CPU processing module is electrically connected with the GPS pulse module, the alternating current zero-crossing module and the output pin of the communication module, and the output pin of the CPU processing module is electrically connected with the input pin of the communication module.

Preferably, the shunt measurement display module adopts a ten-inch true color display screen.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the system introduces the measurement of the shunt vector of the earth network, and corrects the current situation that the impedance measurement of the earth network with a shunt path is inaccurate.

2. The measuring system obtains accurate zero phase timestamp through GPS accurate pulse per second and a zero-crossing detection circuit, thereby obtaining accurate shunt vector phase angle and solving the problem of phase angle deviation of some shunt measuring systems.

3. The shunt measurement is simple in operation, and measurement and data recording of each shunt point can be completed without the cooperation of an additional frequency-selecting current voltmeter.

4. And a frequency conversion anti-interference technology is adopted, so that the anti-interference capability is strong, and the measurement result is stable.

Drawings

FIG. 1 is a schematic diagram of the system of the present invention;

fig. 2 is a schematic diagram of a principle of an embodiment of the present invention.

In the figure: the system comprises a host computer 1, a current transformer 11, a host computer current signal filtering module 12, a host computer signal amplifying module 13, a host computer ADC acquisition module 14, a host computer GPS second pulse module 15, a host computer alternating current zero-crossing detection module 16, a host computer communication module 17, a host computer CPU processing module 18, a split-flow vector testing module 2, a flexible open Rogowski coil 21, a signal filtering module 22, a signal amplifying module 23, a ADC acquisition module 24, a pilot frequency signal extraction module 25, a split-flow measurement display module 26, a GPS pulse module 27, a zero-crossing alternating current module 28, a communication module 29, a CPU processing module 210 and a wireless communication module 3.

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 work belong to the protection scope of the present invention.

Referring to fig. 1, the present invention provides a technical solution: a grounding device shunt vector test system based on GPS and wireless synchronization technology comprises a host 1, a shunt vector test module 2 and a wireless communication module 3, wherein the host 1 and the shunt vector test module 2 are electrically connected through the wireless communication module 3, the host 1 consists of a current transformer 11, a host current signal filtering module 12, a host signal square motor module 13, a host ADC acquisition module 14, a host GPS second pulse module 15, a host alternating current zero crossing detection module 16, a host communication module 17 and a host CPU processing module 18, an input pin of the host CPU processing module 18 is electrically connected with an output pin of the host ADC acquisition module 14, an input pin of the host ADC acquisition module 14 is electrically connected with an output pin of the host signal square motor module 13, an input pin of the host signal square motor module 13 is electrically connected with an output pin of the host current signal filtering module 12, an input pin of the host current signal filtering module 12 is electrically connected with an output pin of the current transformer 11, an input pin of the host CPU processing module 18 is electrically connected with an output pin of the host GPS second pulse module 15, the host alternating current zero-crossing detection module 16 and the host communication module 17, and an input pin of the host communication module 17 is electrically connected with an output pin of the host CPU processing module 18;

the shunt vector testing module 2 is composed of a flexible open rogowski coil 21, a signal filtering module 22, a signal amplifying module 23, an ADC (analog-to-digital converter) acquisition module 24, a pilot frequency signal extraction module 25, a shunt measurement display module 26, a GPS (global positioning system) pulse module 27, an alternating current zero-crossing module 28, a communication module 29 and a CPU (central processing unit) processing module 210, wherein an input pin of the CPU processing module 210 is electrically connected with an output pin of the pilot frequency signal extraction module 25, an input pin of the pilot frequency signal extraction module 25 is electrically connected with an output pin of the ADC acquisition module 24, an input pin of the ADC acquisition module 24 is electrically connected with an output pin of the signal amplifying module 23, an input pin of the signal amplifying module 23 is electrically connected with an output pin of the signal filtering module 22, an input pin of the signal filtering module 22 is electrically connected with an output pin of the flexible open rogowski coil 21, and an output pin of the CPU processing module 210, the input pin of the CPU processing module 210 is electrically connected with the output pins of the GPS pulse module 27, the ac zero-crossing module 28, and the communication module 29, and the output pin of the CPU processing module 210 is electrically connected with the input pin of the communication module 29.

Preferably, the shunt measurement display module 26 is a ten-inch true color display screen.

In the application, the main machine 1 part comprises a current transformer 11 which can sense the test current output by the main machine 1; the host current signal filtering module 12 can remove interference signals entering the measuring system; the host signal amplification module 13 is used for carrying out gain scaling on the signal to be detected by the operational amplifier circuit according to the signal amplitude; the host ADC sampling module 14 is used for digitizing the analog signals by adopting 16-bit AD; the host GPS second pulse module 15 receives a GPS second pulse signal as one of shunting vector phase angle calculation time scales; the host alternating current zero-crossing detection module 16 and the host 1 current signal zero-phase acquisition circuit; the host communication module 17 is used for sending the alternating current phase angle time scale of the host 1 and receiving the test value of the shunt test device; the host CPU processing module 18 calculates the modulus value and the phase angle value of each point shunt test to obtain the final ground resistance value.

The shunt vector test module 2 comprises a flexible open rogowski coil 21 and is used for inducing weak shunt current signals; a signal filtering module 22; the signal amplification module 23 is used for amplifying the signal according to the signal amplitude value, wherein the shunt current is generally small; an ADC sampling module 24 that digitizes the analog signal using 16-bit AD; the pilot frequency signal extraction module 25 extracts a signal at the current test frequency; a shunt measurement display module 26 for displaying the magnitude and phase angle of the measured shunt current; a GPS second pulse module 27, which is used as one of the time scales for calculating the phase angle of the shunt vector; the alternating current zero-crossing detection module 28 is used for carrying out zero-crossing point detection on the amplified pilot frequency alternating current signal; the communication module 29, and the host 1 for data transmission; the CPU processing module 210 calculates the modulus and phase angle of the split flow.

As shown in fig. 2, a host ac zero-cross detection and reception module and an ac zero-cross detection and reception module (e.g., the host ac zero-cross detection and radio frequency transmission unit 16 and the ac zero-cross detection and reception unit 28 in fig. 1) are used, the host 1 directly transmits a test current zero-cross signal to a hardware reception circuit of the shunt vector measurement module 2 in a radio frequency manner, and the shunt vector measurement module 2 compares its own zero-cross timestamp with a timestamp of receiving the signal to determine a time difference between the test current and the shunt current, thereby obtaining an accurate phase angle.

The working principle is as follows: the shunt vector testing module 2 acquires the pulse per second to record the current time stamp, starts a timer, and records the time stamp of the timer when detecting that the current signal passes through zero. Meanwhile, the host 1 also records a second pulse time stamp and a current signal zero-crossing time stamp, and the shunt vector test module 2 compares and calculates the signal zero-crossing time difference of the test current and the shunt current after acquiring the time stamp information of the host 1 through the wireless communication module 3, so as to obtain the phase angle of the shunt current, and calculates the module value of the shunt current through a pilot frequency signal separation algorithm. And wirelessly sending the measured values of all the shunting points to a host end for summarizing and then carrying out vector operation to calculate the final ground resistance value.

The related modules involved in the system are all hardware system modules or functional modules combining computer software programs or protocols with hardware in the prior art, and the computer software programs or the protocols involved in the functional modules are all known in the technology of persons skilled in the art, and are not improvements of the system; the improvement of the system is the interaction relation or the connection relation among all the modules, namely the integral structure of the system is improved, so as to solve the corresponding technical problems to be solved by the system.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a ground device reposition of redundant personnel vector test system based on GPS and wireless synchronization technique, includes host computer (1), reposition of redundant personnel vector test module (2) and wireless communication module (3), its characterized in that: the split-flow vector testing device is characterized in that the host (1) and the split-flow vector testing module (2) are electrically connected through the wireless communication module (3), the host (1) is composed of a current transformer (11), a host current signal filtering module (12), a host signal side arrival module (13), a host ADC (analog to digital converter) acquisition module (14), a host GPS (global positioning system) second pulse module (15), a host AC zero-cross detection module (16), a host communication module (17) and a host CPU (central processing unit) processing module (18), an input pin of the host CPU processing module (18) is electrically connected with an output pin of the host ADC acquisition module (14), an input pin of the host ADC acquisition module (14) is electrically connected with an output pin of the host signal side arrival module (13), an input pin of the host signal side arrival module (13) is electrically connected with an output pin of the host current signal filtering module (12), and an input pin of the host current signal filtering module (12) is electrically connected with an output The input pin of the host CPU processing module (18) is electrically connected with the output pins of the host GPS second pulse module (15), the host alternating current zero-crossing detection module (16) and the host communication module (17), and the input pin of the host communication module (17) is electrically connected with the output pin of the host CPU processing module (18);

the shunt vector testing module (2) is composed of a flexible open Rogowski coil (21), a signal filtering module (22), a signal amplifying module (23), an ADC (analog to digital converter) acquisition module (24), a pilot frequency signal extraction module (25), a shunt measurement display module (26), a GPS (global positioning system) pulse module (27), an alternating current zero-crossing module (28), a communication module (29) and a CPU (central processing unit) processing module (210), wherein an input pin of the CPU processing module (210) is electrically connected with an output pin of the pilot frequency signal extraction module (25), an input pin of the pilot frequency signal extraction module (25) is electrically connected with an output pin of the ADC acquisition module (24), an input pin of the ADC acquisition module (24) is electrically connected with an output pin of the signal amplifying module (23), an input pin of the signal amplifying module (23) is electrically connected with an output pin of the signal filtering module (22), an input pin of the signal filtering module (22) is electrically connected with an output pin of the flexible open Rogowski coil (21), an output pin of the CPU processing module (210) is electrically connected with an input pin of the shunt measurement display module (26), an input pin of the CPU processing module (210) is electrically connected with output pins of the GPS pulse module (27), the AC zero-crossing module (28) and the communication module (29), and an output pin of the CPU processing module (210) is electrically connected with an input pin of the communication module (29).

2. The system according to claim 1, wherein the testing system comprises: the shunt measurement display module (26) adopts a ten-inch true color display screen.