CN204422659U - A kind of grounding net of transformer substation Transient grounding resistance and the automatic test diagnosis equipment of response - Google Patents

Abstract

The utility model relates to a substation grounding grid impact grounding impedance and response automatic testing and diagnosis equipment, including the grounding grid grounding down-conductor connection and voltage and current electrode release module, the impact current generation, storage and signal transmission device module, transient waveform acquisition , storage and signal transmission device, calculation and analysis, display and control module, and print output module; the grounding grid grounding down-conductor connection and voltage and current electrode discharge module are respectively connected with the impulse current generation, storage and signal transmission device module, The transient waveform collection, storage and signal transmission device are connected; the calculation analysis, display and control modules are respectively connected with the impulse current generation, storage and signal transmission device module, transient waveform collection, storage and signal transmission device and printout module . Compared with the prior art, the utility model has the advantages of high diagnostic efficiency, simple operation, accurate measurement and the like.

Description

A substation grounding network impulse grounding impedance and response automatic test and diagnosis equipment

technical field

The utility model relates to a substation grounding grid monitoring technology, in particular to a substation grounding grid impact grounding impedance and response automatic testing and diagnosis equipment.

Background technique

Substation grounding grid is an important facility to ensure electrical equipment and personal safety. Because the grounding grid is buried underground, the grounding body is often thinned or even broken due to years of soil corrosion, which deteriorates the grounding performance of the grounding grid. At present, the detection of the grounding performance of the grounding grid in engineering is generally judged indirectly through the power frequency grounding resistance, but it is impossible to know the corrosion of the grounding grid. Because as long as the grounding body at the measurement point does not break, even if the grounding grid is severely corroded, the power frequency grounding resistance can usually meet the requirements of the regulations. Therefore, in engineering, it is generally found that the power frequency grounding resistance of the grounding grid is unqualified or an accident caused by a defect in the grounding grid is found, and a large area of excavation is used to find the breakpoint and corrosion section of the grounding grid. This working method is blind. The workload is enormous.

In addition, the grounding impedance value obtained by the commonly used power frequency grounding resistance test is 50Hz or close to the power frequency grounding impedance value at 50Hz, but in fact, a short-circuit grounding fault occurs in the substation, or the grounding network The transient impact grounding impedance plays a decisive role. Therefore, only measuring the power frequency grounding impedance cannot represent that the substation grounding grid can operate safely under fault conditions.

Utility model content

The purpose of this utility model is to overcome the above-mentioned defects in the prior art and to provide an automatic test and diagnosis equipment for substation grounding network impact grounding impedance and response with high diagnostic efficiency, easy operation and accurate measurement, which can be used without power failure or large-scale In the case of area excavation, the operating status of the grounding grid, that is, the corrosion situation, can be detected only by relying on the down-conductor of the grounding grid as the input and output terminals.

The purpose of this utility model can be achieved through the following technical solutions:

A substation grounding grid impact grounding impedance and response automatic test and diagnosis equipment, characterized in that it includes grounding grid grounding down-conductor connection and voltage and current pole discharge wire module, impulse current generation, storage and signal transmission device module, transient waveform acquisition , storage and signal transmission device, calculation analysis, display and control module, and print output module;

The grounding grid grounding down conductor connection and the voltage and current electrode discharge module are respectively connected with the impulse current generation, storage and signal transmission device module, and the transient waveform acquisition, storage and signal transmission device; the calculation analysis, display and The control module is respectively connected with the impulse current generation, storage and signal transmission device module, the transient waveform acquisition, storage and signal transmission device and the printout module.

The grounding grid grounding down conductor connection and the voltage and current electrode discharge module are respectively connected to the impulse current generation, storage and signal transmission device module, and the transient waveform acquisition, storage and signal transmission device through wires.

The impulse current generation, storage and signal transmission device module and the transient waveform collection, storage and signal transmission device are respectively connected to the calculation analysis, display and control modules through the USB communication interface.

The calculation analysis, display and control modules are connected with the printout module through a TCP/IP network.

The calculation, analysis, display and control modules are notebook computers or industrial computers.

The transient waveform acquisition, storage and signal transmission device is a transient waveform recorder, including communication and control circuits, data acquisition storage and output circuits, power conversion circuits and power supplies, and the communication and control circuits and data acquisition storage It is connected with the output circuit, the input end of the power conversion circuit is connected with the power supply, and the output end is respectively connected with the communication and control circuit, data acquisition and storage and output circuit.

The module of the impulse current generation, storage and signal transmission device includes a communication and control unit, an impulse current generation and output unit, a data acquisition storage and output unit, a power conversion unit and a power supply, and the communication and control unit are respectively connected with the impulse current The generation and output unit is connected to the data acquisition and storage and output unit. The input end of the power conversion unit is connected to the power supply, and the output end is respectively connected to the communication and control unit, the impulse current generation and output unit, and the data acquisition and storage and output unit.

The power supply provides working power for internal large-capacity DC battery or external 220V.

Compared with the prior art, the utility model understands the running state of the grounding grid, determines whether the grounding grid is corroded, and ensures the safe and reliable operation of the power system without power failure or excavation of the grounding grid, and has simple, It has the advantages of being accurate and not limited by field operating conditions.

Description of drawings

Fig. 1 is a schematic block diagram of the utility model;

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

Detailed ways

The utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Example

As shown in Figure 1, a substation grounding grid impact grounding impedance and response automatic test and diagnosis equipment is characterized in that it includes a grounding grid grounding down-conductor connection and a voltage and current electrode discharge module 10, and the impact current generation, storage and signal transmission Device module 11, transient waveform acquisition, storage and signal transmission device 12, calculation analysis, display and control module 13, and printout module 14; described grounding grid grounding down conductor connection and voltage and current electrode discharge wire module 10 respectively It is connected with the impulse current generation, storage and signal transmission device module 11, and the transient waveform acquisition, storage and signal transmission device 12; the calculation analysis, display and control module 13 are respectively connected with the impulse current generation, storage and signal transmission device module 11 , the transient waveform acquisition, storage and signal transmission device 12 and the printout module 14 are connected.

The grounding grid grounding down conductor connection and the voltage and current pole discharge module 10 are respectively connected to the impulse current generation, storage and signal transmission device module 11 and the transient waveform acquisition, storage and signal transmission device 12 through wires.

The inrush current generation, storage and signal transmission device module 11 and the transient waveform acquisition, storage and signal transmission device 12 are respectively connected to the calculation analysis, display and control module 13 through the USB communication interface.

The calculation analysis, display and control module 13 is connected with the printout module 14 through a TCP/IP network. The calculation analysis, display and control module 13 is a notebook computer or an industrial computer.

Described transient waveform acquisition, storage and signal transmission device 12 are transient waveform recorders, including communication and control circuit, data acquisition storage and output circuit, power conversion circuit and power supply, and described communication and control circuit and data acquisition The storage is connected to the output circuit, the input end of the power conversion circuit is connected to the power supply, and the output end is respectively connected to the communication and control circuit, data acquisition storage and output circuit.

The described impulse current generation, storage and signal transmission device module 11 includes a communication and control unit, an impulse current generation and output unit, a data acquisition storage and output unit, a power conversion unit and a power supply, and the communication and control unit are respectively connected with the impact The current generation and output unit is connected to the data acquisition and storage and output unit, the input end of the power conversion unit is connected to the power supply, and the output end is respectively connected to the communication and control unit, the impulse current generation and output unit, and the data acquisition and storage and output unit .

The power supply provides working power for internal large-capacity DC battery or external 220V.

As shown in Figure 2, enter a substation, select the 1# main transformer grounding bar down conductor 7 of the substation grounding grid 5 as the grounding grid impact impedance test point, that is, the impact response input terminal G, according to the diagonal length of the grounding grid according to DL/T475-2006 Discharge the voltage test line to the remote voltage ground electrode 91, and the current test line to the remote current ground electrode 92. The input terminal G of the grounding down conductor and the current test line are connected to the on-site impulse current generator 2 . Select the lightning arrester A of the outlet switch, the grounding downconductor 7 of the corner B of the wall as the output terminal of the grounding grid impact response, and connect the voltage test line to the transient waveform recorder 3 . The host computer 4 is connected with the impulse current generator 2 and the transient waveform recorder 3 through a USB interface. Set the impulse current generator 2 to output a standard current waveform of 8/20μs through the host computer 4, the peak value is greater than 10A, and set the sampling rate of the transient waveform recorder 3 to 100MS/s. After the relevant connections and settings are completed, the test record is calculated and analyzed, and the impulse response curve is drawn to obtain the impact grounding impedance of the grounding grid and the impulse response curve of each output terminal; it can be based on the change of the current impact grounding impedance value and the current impulse response curve and the historical curve The magnitude of the correlation coefficient evaluates the corrosion state of the grounding grid.

The utility model adopts a man-machine interface, which mainly includes an engineering creation interface, a data collection interface, and a diagnosis result interface. In the project creation interface, you only need to input the name of the grounding network to be tested, the voltage level and the position of the selected input and output terminal grounding down conductors, as well as the parameters of the output impulse current waveform and the acquisition parameters of the temporary voltage waveform to enter the test and data. Collect interface for testing. After the test, this set of data can be calculated immediately, and the grounding network impact grounding impedance of the grounding down-conductor at the input end and the impact response curve of the grounding down-conductor at the output end can be obtained, and the calculation results are presented on the display in the form of a graph, combined with Based on the historical data, the trend of the impact grounding impedance of the grounding grid and the correlation coefficient between the current impulse response curve and the historical data are obtained, and then the operating status of the grounding grid is judged.

The utility model highlights the business characteristics of the automatic test and diagnosis of the substation grounding network, uses electronic detection means to replace manual detection, greatly simplifies the test means, and improves the detection efficiency.

In the implementation case of the utility model, the impulse current generator 2, the transient waveform recorder 3 and the host computer 4 all utilize a built-in large-capacity DC battery, and also can utilize a ready-made 220V external power supply.

The system design follows open principles, enabling users to enjoy maximum data collection automation and grounding grid status analysis systematization in the actual use environment. In this system, the openness of the system is manifested in the openness of the data acquisition system, database management system and application analysis system, and the communication standard USB protocol is adopted for the interaction between data.

The above is only a specific embodiment of the utility model, but the technical characteristics of the utility model are not limited thereto, and any changes or modifications made by those skilled in the art within the scope of the utility model are all covered by the utility model. within the scope of the new patent.

Claims (8)

1. A substation grounding grid impact grounding impedance and response automatic test and diagnosis equipment, characterized in that it includes a grounding grid grounding down-conductor connection and a voltage and current electrode discharge module (10), an impact current generation, storage and signal transmission device module (11), transient waveform acquisition, storage and signal transmission device (12), calculation analysis, display and control module (13), and print output module (14); The grounding grid grounding down conductor connection and the voltage and current electrode discharge module (10) are respectively connected with the impulse current generation, storage and signal transmission device module (11), and the transient waveform acquisition, storage and signal transmission device (12) ; The calculation analysis, display and control module (13) are respectively connected with the impact current generation, storage and signal transmission device module (11), transient waveform acquisition, storage and signal transmission device (12) and printout module (14) connect. 2. A kind of substation grounding network impact grounding impedance and response automatic test diagnostic equipment according to claim 1, is characterized in that, described grounding network grounding down-conductor connection and voltage current pole discharge wire module (10) pass through respectively The wire is connected with the impulse current generation, storage and signal transmission device module (11), and the transient waveform acquisition, storage and signal transmission device (12). 3. a kind of substation grounding grid impact grounding impedance according to claim 1 and response automatic test diagnostic equipment, it is characterized in that, described impact current generation, storage and signal transmission device module (11) and transient waveform acquisition, The storage and signal transmission device (12) is respectively connected with the calculation analysis, display and control module (13) through the USB communication interface. 4. A kind of substation grounding grid impact grounding impedance and response automatic test and diagnosis equipment according to claim 1, is characterized in that, described calculation analysis, display and control module (13) pass through TCP/IP network and printout module (14) CONNECTION. 5. A substation grounding network impact grounding impedance and response automatic test and diagnosis equipment according to claim 1, characterized in that, the calculation analysis, display and control module (13) is a notebook computer or an industrial computer. 6. A kind of substation grounding network impact grounding impedance and response automatic test and diagnosis equipment according to claim 1, is characterized in that, described transient waveform acquisition, storage and signal transmission device (12) is transient waveform recorder , including a communication and control circuit, a data acquisition storage and output circuit, a power conversion circuit and a power supply, the communication and control circuit is connected to the data acquisition storage and output circuit, the input end of the power conversion circuit is connected to the power supply, and the output end They are respectively connected with communication and control circuits, data acquisition and storage and output circuits. 7. A kind of substation grounding grid impact grounding impedance and response automatic test and diagnosis equipment according to claim 1, characterized in that, the described impact current generation, storage and signal transmission device module (11) includes a communication and control unit, Inrush current generation and output unit, data acquisition storage and output unit, power conversion unit and power supply, the communication and control unit are respectively connected with the inrush current generation and output unit, data acquisition storage and output unit, the power conversion unit The input terminal is connected to the power supply, and the output terminal is respectively connected to the communication and control unit, the impulse current generation and output unit, and the data acquisition storage and output unit. 8. A substation grounding network impact grounding impedance and response automatic test and diagnosis equipment according to claim 6 or 7, characterized in that the power supply is an internal large-capacity DC battery or an external 220V to provide working power.