Lightning arrester digital leakage ammeter with communication function

Abstract

The utility model discloses a lightning arrester digital leakage ammeter with a communication function, which relates to the technical field of lightning arresters and comprises a lightning arrester leakage ammeter and an RS485 communication board connected with the lightning arrester leakage ammeter. The RS485 communication board is used for recording parameters of the lightning arrester leakage ammeter and transmitting the parameters to the computer; the parameters comprise leakage current, discharge times and discharge time. According to the utility model, abnormal conditions of the lightning arrester can be found in time, various parameters of operation of the lightning arrester can be mastered, and safe operation of the lightning arrester is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of lightning arresters, in particular to a digital leakage current meter for lightning arresters with a communication function. Background Art

[0002] With the continuous improvement of the automation level of power systems, unattended power stations are becoming more and more popular. Since ordinary lightning arrester leakage current meters need to be inspected by on-duty personnel, their weaknesses are becoming more and more obvious and can no longer meet the development of the situation. Utility Model Content

[0003] The utility model aims to provide a digital leakage current meter for lightning arresters with a communication function, which is used to timely grasp various operating parameters of the lightning arrester and ensure the safe operation of the lightning arrester.

[0004] To achieve the above object, the utility model provides a lightning arrester digital leakage current meter with communication function, comprising: a lightning arrester leakage current meter and an RS485 communication board connected to the lightning arrester leakage current meter; the RS485 communication board is used to record the parameters of the lightning arrester leakage current meter and transmit the parameters to a computer; the parameters include leakage current, discharge times and discharge time;

[0005] The RS485 communication board includes: a sampling relay, a single-chip microcomputer, a sampling resistor, an A / D analog-to-digital converter and an RS485 communication module; one end of the sampling relay is connected to the discharge counter in the arrester leakage current meter, and the other end of the sampling relay is connected to the input end of the single-chip microcomputer; the sampling resistor is connected in series with the leakage current meter in the arrester leakage current meter and then connected to the A / D analog-to-digital converter, and the A / D analog-to-digital converter is also connected to the input end of the single-chip microcomputer; the output end of the single-chip microcomputer is connected to the RS485 communication module; the single-chip microcomputer is used to record the number of discharges of the arrester leakage current meter through the sampling relay, and record the leakage current of the arrester leakage current meter through the sampling resistor and the A / D analog-to-digital converter, and the single-chip microcomputer is also used to record the discharge time of the arrester leakage current meter; the RS485 communication module transmits the parameters recorded by the single-chip microcomputer to the computer.

[0006] According to the specific embodiments provided by the utility model, the utility model discloses the following technical effects:

[0007] The digital lightning arrester leakage current meter with communication function provided by the utility model adds an RS485 communication board composed of a single-chip microcomputer, an A / D analog-to-digital converter, an RS485 communication module, etc. to the original ordinary lightning arrester leakage current meter, and the function of the original lightning arrester leakage current meter remains unchanged. The utility model can transmit the leakage current, discharge times and discharge time of the lightning arrester to the computer in real time, and then transmit it to the superior, so as to timely discover the abnormal situation of the lightning arrester, grasp the various parameters of the operation of the lightning arrester, and ensure the safe operation of the lightning arrester. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0009] Figure 1 The utility model provides a structural block diagram of a digital leakage current meter for lightning arresters with a communication function. DETAILED DESCRIPTION

[0010] 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.

[0011] The utility model aims to provide a digital leakage current meter for lightning arresters with a communication function, which can timely grasp various operating parameters of the lightning arrester through a newly added RS485 communication board to ensure the safe operation of the lightning arrester.

[0012] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0013] The utility model provides a lightning arrester digital leakage current meter with communication function, comprising: a lightning arrester leakage current meter and an RS485 communication board connected to the lightning arrester leakage current meter. The RS485 communication board is used to record the parameters of the lightning arrester and transmit the parameters to a computer; the parameters include leakage current, discharge times and discharge time.

[0014] like Figure 1As shown, the arrester leakage current meter includes a sampling circuit 1, a discharge counter 2 and a leakage current meter 3; one end of the sampling circuit 1 is connected to the arrester 4, and the other end of the sampling circuit 1 is grounded; one end of the discharge counter 2 is connected to the sampling circuit 11, and the leakage current meter 3 is connected to the sampling circuit 1.

[0015] like Figure 1 As shown, the RS485 communication board includes: a sampling relay 5, a single-chip computer 6, a sampling resistor 7, an A / D analog-to-digital converter 8 and an RS485 communication module 9. One end of the sampling relay 5 is connected to the discharge counter 2 in the arrester leakage current meter 1, and the other end of the sampling relay 5 is connected to the input end of the single-chip computer 6; the sampling resistor 7 is connected in series with the leakage current meter 13 in the arrester leakage current meter 1 and then connected to the A / D analog-to-digital converter 8, and the A / D analog-to-digital converter 8 is also connected to the input end of the single-chip computer 6; the output end of the single-chip computer 6 is connected to the RS485 communication module 9; the single-chip computer 6 is used to record the number of discharges of the arrester through the sampling relay 2, and the leakage current of the arrester through the sampling resistor 7 and the A / D analog-to-digital converter 8, and the single-chip computer 6 is also used to record the discharge time of the arrester; the RS485 communication module 9 transmits the parameters recorded by the single-chip computer 6 to the computer.

[0016] The RS485 communication module 9 is provided with a photoelectric isolator, so that the signal line has no electrical connection with the single-chip computer 6, and has good anti-interference performance. The RS485 communication module 9 will not be affected by the increase in ground potential when the lightning arrester discharges.

[0017] The utility model provides a digital lightning arrester leakage current meter with communication function, which has the function of recording and transmitting the number of lightning arrester discharges. The number of lightning arrester discharges is measured by sending a signal through a micro relay (i.e., sampling relay 5). When the lightning arrester discharges, the micro relay closes once, and the relay contact is connected to the port of the single-chip microcomputer 6. The single-chip microcomputer 6 records the number of lightning arrester discharges and the system time, which is the discharge time of the lightning arrester. The leakage current of the lightning arrester is measured by connecting a sampling resistor 7 in series under the milliammeter in the original leakage current meter, and the sampling resistor 7 is connected to the A / D analog-to-digital converter 8. When the upper computer needs to transmit data, the A / D analog-to-digital converter 8 starts to work and transmits the lightning arrester leakage current value and the number of lightning arrester discharges and discharge time recorded by the system to the computer.

[0018] The digital leakage current meter for lightning arresters with communication function provided by the utility model is also provided with a power supply module 10, which converts the 24V voltage into a 5V DC voltage to supply power to the single-chip microcomputer 6, the RS485 communication module 9, and the A / D analog-to-digital converter 8.

[0019] The digital leakage current meter for lightning arresters with a communication function provided by the utility model is provided with a precision cast aluminum housing, a signal line is led out from the lower part of the housing, and has good sealing performance and rainproof performance.

[0020] The arrester digital leakage current meter with communication function provided by the utility model sets different communication codes, so that a plurality of arrester digital leakage current meters can be connected to the background system at the same time.

[0021] The alarm value is set in the computer system. When a parameter of the lightning arrester exceeds the set value, an alarm signal is issued to improve the reliability of the lightning arrester operation.

[0022] The arrester digital leakage current meter with communication function provided by the utility model is based on the ordinary arrester leakage current meter, and is equipped with a digital RS485 communication function. It has the functions of an ordinary arrester leakage current meter, and can transmit the arrester operating parameters to a computer over a long distance through a digital RS485 communication method. It has long transmission distance, strong anti-interference ability, reliable operation, and easy installation. Multiple arrester digital leakage current meters share a signal line, and the computer can check the operating parameters of each arrester connected to the communication line at any time. Table 1 shows the performance parameters of the arrester digital leakage current meter with communication function.

[0023] Table 1 Performance parameters

[0024] Serial number project Technical Data 1 Applicable power system rated voltage kV (effective value) 200 and below 2 Nominal discharge current kA (peak) 10 3 Residual voltage at nominal discharge current ≤ kV (peak value) 1.0 4 2ms square wave tolerance ≥A 1000 5 4 / 10μs high current withstand kA (peak) 100 6 Minimum operating current (8 / 20us) A (peak) 50 7 Count range (cycle count) 0～999 8 Current measurement range mA 0～3 9 Power frequency current tolerance mA (effective value) 20 10 Communication RS485

[0025] This article uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the method and core ideas of the utility model. At the same time, for those skilled in the art, according to the ideas of the utility model, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the utility model.

Claims

1. A digital leakage current meter for lightning arresters with communication function, characterized in that: include: A lightning arrester leakage current meter and an RS485 communication board connected to the lightning arrester leakage current meter; the RS485 communication board is used to record the parameters of the lightning arrester and transmit the parameters to a computer; the parameters include leakage current, discharge times and discharge time; The RS485 communication board includes: a sampling relay, a single-chip microcomputer, a sampling resistor, an A / D analog-to-digital converter and an RS485 communication module; one end of the sampling relay is connected to the discharge counter in the arrester leakage current meter, and the other end of the sampling relay is connected to the input end of the single-chip microcomputer; the sampling resistor is connected in series with the leakage current meter in the arrester leakage current meter and then connected to the A / D analog-to-digital converter, and the A / D analog-to-digital converter is also connected to the input end of the single-chip microcomputer; the output end of the single-chip microcomputer is connected to the RS485 communication module; the single-chip microcomputer is used to record the number of discharges of the arrester through the sampling relay, and record the leakage current of the arrester through the sampling resistor and the A / D analog-to-digital converter, and the single-chip microcomputer is also used to record the discharge time of the arrester; the RS485 communication module transmits the parameters recorded by the single-chip microcomputer to the computer.

2. The arrester digital leakage current meter with communication function according to claim 1 is characterized in that: The arrester leakage current meter includes a sampling circuit, a discharge counter and a leakage current meter; one end of the sampling circuit is connected to the arrester, and the other end of the sampling circuit is grounded; one end of the discharge counter is connected to the sampling circuit, and the other end of the discharge counter is connected to the single-chip microcomputer; the leakage current meter is connected to the sampling circuit.

3. The arrester digital leakage current meter with communication function according to claim 1 is characterized in that: The RS485 communication module is provided with a photoelectric isolator.

4. The arrester digital leakage current meter with communication function according to claim 1 is characterized in that: The RS485 communication board also includes a power module, which is respectively connected to the RS485 communication module, the single-chip microcomputer and the A / D analog-to-digital converter and is used to supply power to the RS485 communication module, the single-chip microcomputer and the A / D analog-to-digital converter.

5. The arrester digital leakage current meter with communication function according to claim 1 is characterized in that: The arrester digital leakage current meter with communication function is provided with a cast aluminum housing.

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