CN214174530U - Intelligent circuit breaker alternating current sampling module - Google Patents
Intelligent circuit breaker alternating current sampling module Download PDFInfo
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- CN214174530U CN214174530U CN202120136335.1U CN202120136335U CN214174530U CN 214174530 U CN214174530 U CN 214174530U CN 202120136335 U CN202120136335 U CN 202120136335U CN 214174530 U CN214174530 U CN 214174530U
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Abstract
The utility model discloses an intelligent circuit breaker AC sampling module, which comprises a metering chip, wherein the metering chip is connected with a three-phase current sampling signal, a zero line current sampling signal and a three-phase voltage sampling signal; the metering chip is connected with a main control chip which controls the working mode through a control signal through a control bus, and the control bus comprises a data transmission and control bus and an original waveform data transmission bus; the three-phase current sampling signals comprise A-phase current sampling signals, B-phase current sampling signals and C-phase current sampling signals, the zero line current sampling signals are N-phase current sampling signals, and the three-phase voltage sampling signals comprise A-phase voltage sampling signals, B-phase voltage sampling signals and C-phase voltage sampling signals. The product can simultaneously measure the voltage, the current, the power, the harmonic waves and the leakage current on the electric power transmission line, has a large dynamic range and high sampling precision.
Description
Technical Field
The utility model relates to a power transmission field especially relates to an intelligence circuit breaker exchanges sampling module.
Background
With the development of the power transmission field, the requirements of power supply enterprises on the quality of power signals, load conditions, power utilization safety and other information and the accuracy of the information are higher and higher, the traditional power utilization metering and measurement are mainly completed by an ammeter or other terminals, a branch section from a transformer to a user in a transformer area is blank, and the branch section is just provided with circuit breakers of various specifications, so that the acquisition of the power supply enterprises on the information of the power grid can be obviously improved by adding a corresponding measurement function on the circuit breakers, the service quality of the users is improved, and the management and marketing level of the power supply enterprises is improved.
At present, the intelligent circuit breaker mainly adopts a general AD conversion chip to sample signals such as voltage, current and the like of a power grid in the measurement of the signals, and then calculates to obtain information such as power, harmonic waves, phases and the like, the prior art adopts the general AD conversion chip, and the technologies have the following defects:
firstly, the realization technology is complex, and a complex sampling circuit is required to be adopted;
secondly, the cost is high, the AD conversion chip is monopolized by foreign chip enterprises, and the price is high;
and thirdly, the sampled data can be processed and operated in a complex way to obtain information such as power, harmonic waves, phases and the like, the algorithm is complex to realize, the accuracy is low, the result is easy to be incorrect, and the real condition of the power grid cannot be reflected.
SUMMERY OF THE UTILITY MODEL
In order to solve the weak point that above-mentioned technique exists, the utility model provides an intelligence circuit breaker exchanges sampling module.
In order to solve the technical problem, the utility model discloses a technical scheme is: an intelligent circuit breaker alternating current sampling module comprises a metering chip, wherein the metering chip is connected with a three-phase current sampling signal, a zero line current sampling signal and a three-phase voltage sampling signal;
the metering chip is connected with a main control chip which controls the working mode through a control signal through a control bus, and the control bus comprises a data transmission and control bus and an original waveform data transmission bus;
the three-phase current sampling signals comprise A-phase current sampling signals, B-phase current sampling signals and C-phase current sampling signals, the zero line current sampling signals are N-phase current sampling signals, and the three-phase voltage sampling signals comprise A-phase voltage sampling signals, B-phase voltage sampling signals and C-phase voltage sampling signals.
Further, the model number adopted by the metering chip is V9203.
Furthermore, the three-phase current signals and the zero line current signals are connected into the metering chip through the miniature current transformer, and the three-phase voltage signals are connected into the metering chip through the divider resistor.
Furthermore, the main control chip is connected with a computer, and the data acquired by the metering chip is transmitted to the main control chip of the main control chip and further uploaded to the computer of the previous stage for processing and utilization.
Further, the data transmission and control bus is used for the configuration and measurement of the metering chip and the acquisition of metering data by the main control chip.
Further, the original waveform data transmission bus is used for collecting original waveform data of the power grid, and the original waveform data are used for analyzing harmonic data and quality of the power grid through Fourier transformation.
The utility model overcomes voltage, electric current, power and harmonic on traditional circuit breaker can not measure power transmission line exist the unsafe problem of current sampling in the aspect of earth leakage protection, and this patent adopts special use with the measuring chip, can measure voltage, electric current, power, harmonic and the leakage current on the power transmission line simultaneously, and dynamic range is big, and the sampling precision is high moreover, reaches more than 0.2%.
Drawings
Fig. 1 is an electrical schematic block diagram of the present invention.
Fig. 2 is a circuit diagram of the a-phase current sampling signal according to the present invention.
Fig. 3 is a circuit diagram of an a-phase voltage sampling signal according to the present invention.
Fig. 4 is a schematic diagram of a connection terminal of the metering chip of the present invention.
Fig. 5 is a schematic diagram of the connection terminal of the main control chip of the present invention.
In the figure: 1. a metering chip; 2. a main control chip; 3. sampling signals of three-phase current; 4. sampling a signal by using zero line current; 5. three-phase voltage sampling signals; 6. a data transmission and control bus; 7. raw waveform data transfer bus.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the ac sampling module of the intelligent circuit breaker includes a metering chip 1, wherein the metering chip 1 is connected to a three-phase current sampling signal 3, a zero-line current sampling signal 4 and a three-phase voltage sampling signal 5; the metering chip 1 is connected with a main control chip 2 which controls the working mode through a control signal through a control bus, and the control bus comprises a data transmission and control bus 6 and an original waveform data transmission bus 7;
the three-phase current sampling signal 3 comprises an A-phase current sampling signal, a B-phase current sampling signal and a C-phase current sampling signal, the zero line current sampling signal 4 is an N-phase current sampling signal, and the three-phase voltage sampling signal 5 comprises an A-phase voltage sampling signal, a B-phase voltage sampling signal and a C-phase voltage sampling signal.
The three-phase current signal and the zero line current signal are connected to the metering chip 1 through the miniature current transformer, and the three-phase voltage signal is connected to the metering chip 1 through the divider resistor.
The utility model discloses three phase current and zero line current signal of electric wire netting insert the measurement chip through miniature current transformer in the use, and voltage signal passes through divider resistance and inserts the measurement chip, and wherein, the model that measurement chip 1 adopted is V9203. When the metering chip works, AD conversion, filtering, integration and accumulation are carried out in the metering chip according to input voltage and current signals to obtain voltage, current, phase and power, further the data of power consumption can be obtained, and the amplitude and phase of each subharmonic signal on a power grid can be calculated through the data of original waveforms. The master control chip controls the working mode of the metering chip through the control signal, adjusts the parameters of the metering chip and calibrates the measurement precision through the control bus, and when the master control chip works normally, the data acquired by the metering chip can be transmitted to the master control chip through the data transmission bus and the original waveform transmission bus and further transmitted to the previous-stage computer for processing and utilization.
Current sampling signals of the A phase, the B phase, the C phase and the N phase convert current on a power grid into current with smaller amplitude through a current transformer, and then are respectively connected to V9203_ IAN and V9203_ IAP (shown IN fig. 2 and 4), V9203_ IBN and V9203_ IBP, V9203_ ICN and V9203_ ICP, V9203_ INN and V9203_ INP terminals, an alternating voltage signal is obtained through a sampling resistor, and then is connected to IA, IB, IC and IN channels of a metering chip.
The voltage signals of the A phase, the B phase and the C phase convert 220V alternating voltage of a power grid into alternating voltage sampling signals with small amplitude through voltage dividing resistors, the alternating voltage sampling signals are respectively connected to V9203_ UA (shown in figures 3 and 4), V9203_ UB and V9203_ UC channels of a metering chip, seven paths of signals are connected to the metering chip in total, AD conversion and processing are carried out in the metering chip, and required measurement values, power and electric quantity metering values are obtained.
For the collection of zero line current, four current lines of A phase, B phase, C phase and N phase simultaneously pass through a current transformer, when no electric leakage occurs, the vector sum of the four current signals is zero, when the electric leakage occurs, a part of current does not pass through the current transformer due to the occurrence of the electric leakage, so that the collected current is not zero any more, and whether the electric leakage occurs or not is judged. Every interval is a period of time in the circuit breaker use, can press the test key and check whether earth leakage protection function is normal, and the circuit breaker judges whether the electric leakage actually takes place or experimental according to the test signal that detects.
The metering chip and the main control chip are connected through two SPI control buses, namely the metering chip 1 is connected with the main control chip 2 which controls the working mode through a control signal through the control bus, the control bus comprises a data transmission and control bus 6 and an original waveform data transmission bus 7, and the actual circuit connection diagram is shown in fig. 4 and fig. 5; the data transmission and control bus 6 is used for the configuration and measurement of the metering chip 1 and the acquisition of metering data by the main control chip 2. The original waveform data transmission bus 7 is used for collecting original waveform data of the power grid, and the original waveform data are used for analyzing harmonic data and quality of the power grid through Fourier transformation.
The utility model overcomes voltage, electric current, power and harmonic on traditional circuit breaker can not measure power transmission line exist the unsafe problem of current sampling in the aspect of earth leakage protection, this patent adopts special use with the measuring chip, can measure voltage, electric current, power, harmonic and leakage current on the power transmission line simultaneously, and dynamic range is big, and the sampling precision is high moreover, reaches more than 0.2% more than
The above embodiments are not intended to limit the present invention, and the present invention is not limited to the above examples, and the technical personnel in the technical field are in the present invention, which can also belong to the protection scope of the present invention.
Claims (6)
1. The utility model provides an intelligence circuit breaker exchanges sampling module which characterized in that: the device comprises a metering chip (1), wherein the metering chip (1) is connected with a three-phase current sampling signal (3), a zero-line current sampling signal (4) and a three-phase voltage sampling signal (5);
the metering chip (1) is connected with a main control chip (2) which controls the working mode through a control signal through a control bus, and the control bus comprises a data transmission and control bus (6) and an original waveform data transmission bus (7);
the three-phase current sampling signal (3) comprises an A-phase current sampling signal, a B-phase current sampling signal and a C-phase current sampling signal, the zero line current sampling signal (4) is an N-phase current sampling signal, and the three-phase voltage sampling signal (5) comprises an A-phase voltage sampling signal, a B-phase voltage sampling signal and a C-phase voltage sampling signal.
2. The intelligent circuit breaker ac sampling module of claim 1, wherein: the metering chip (1) adopts a model V9203.
3. The intelligent circuit breaker ac sampling module of claim 1, wherein: the three-phase current sampling signal and the zero line current sampling signal are both connected into the metering chip (1) through the miniature current transformer, and the three-phase voltage sampling signal is both connected into the metering chip (1) through the divider resistor.
4. The intelligent circuit breaker ac sampling module of claim 1, wherein: the main control chip (2) is connected with a computer, and the data collected by the metering chip (1) is transmitted to the main control chip (2) and further uploaded to the computer of the previous stage for processing and utilization.
5. The intelligent circuit breaker ac sampling module of claim 1, wherein: the data transmission and control bus (6) is used for the configuration and measurement of the metering chip (1) and the acquisition of metering data by the main control chip (2).
6. The intelligent circuit breaker ac sampling module of claim 1, wherein: the original waveform data transmission bus (7) is used for collecting original waveform data of the power grid, and the original waveform data are used for analyzing harmonic data and quality of the power grid through Fourier transformation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120136335.1U CN214174530U (en) | 2021-01-19 | 2021-01-19 | Intelligent circuit breaker alternating current sampling module |
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| CN202120136335.1U CN214174530U (en) | 2021-01-19 | 2021-01-19 | Intelligent circuit breaker alternating current sampling module |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114280499A (en) * | 2021-12-21 | 2022-04-05 | 国能榆林能源有限责任公司 | Electric leakage detection method for coal mine underground power supply system and coal mine underground power supply system |
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2021
- 2021-01-19 CN CN202120136335.1U patent/CN214174530U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114280499A (en) * | 2021-12-21 | 2022-04-05 | 国能榆林能源有限责任公司 | Electric leakage detection method for coal mine underground power supply system and coal mine underground power supply system |
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