CN112816769A - Current and voltage combined data acquisition device - Google Patents
Current and voltage combined data acquisition device Download PDFInfo
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- CN112816769A CN112816769A CN201911120653.2A CN201911120653A CN112816769A CN 112816769 A CN112816769 A CN 112816769A CN 201911120653 A CN201911120653 A CN 201911120653A CN 112816769 A CN112816769 A CN 112816769A
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Abstract
The invention relates to a current and voltage combined data acquisition device, and belongs to the technical field of intelligent substation line detection. Wherein the device comprises a voltage sensor and a Rogowski coil type current sensor; the output end of the voltage sensor is sequentially connected with the input ends of the signal conditioning unit, the low-pass filtering processing unit and the data processing module; the output end of the Rogowski coil type current sensor is sequentially connected with the input ends of the signal isolation unit, the signal amplification and integral operation unit and the data processing module; and the data processing module processes the two received signals and then combines and outputs the signals. The invention realizes the synchronous and accurate acquisition of the current and voltage signals and improves the measurement accuracy and stability of the current and voltage data acquisition device under the interference of the external electromagnetic environment.
Description
Technical Field
The invention relates to a current and voltage combined data acquisition device, and belongs to the technical field of intelligent substation line detection.
Background
The intelligent substation power system line detection requires simultaneous acquisition of line voltage and current information, and the installation of three-phase current and voltage sensors respectively is high in cost and high in reliability, and due to the fact that the number of current and voltage acquisition devices is large, the equipment fault risk is improved, and the stability and reliability of system operation are reduced.
The study current-voltage combined data acquisition device can realize the simultaneous acquisition of the current and the voltage of a line, reduce the primary and secondary equipment configuration of a system, but has the problem of inconsistent characteristics of analog signals output by current and voltage transmission. Therefore, how to implement synchronous and accurate acquisition of current and voltage signals by using a current and voltage combined data acquisition device is an urgent technical problem to be solved in the field.
Disclosure of Invention
The invention aims to provide a current-voltage combined data acquisition device to solve the problem that the existing current-voltage combined data acquisition device cannot realize synchronous and accurate acquisition of current-voltage signals.
In order to achieve the above object, the present invention provides a current-voltage combined data acquisition device, which comprises a voltage sensor and a rogowski coil type current sensor; the output end of the voltage sensor is sequentially connected with the input ends of the signal conditioning unit, the low-pass filtering processing unit and the data processing module; the output end of the Rogowski coil type current sensor is sequentially connected with the input ends of the signal isolation unit, the signal amplification and integral operation unit and the data processing module; the data processing module processes the two received signals and then combines and outputs the signals;
the signal conditioning unit is used for carrying out voltage division processing on the analog small voltage signal output by the voltage sensor; the low-pass filtering processing unit is used for converting the output signal of the signal conditioning unit into an analog signal which is in direct proportion to the amplitude of the primary voltage and has the same phase; the signal isolation unit is used for filtering high-frequency interference in the analog small-voltage signal output by the Rogowski coil type current sensor, and the signal amplification and integration operation unit is used for converting the output signal of the signal isolation unit into an analog signal which is in direct proportion to the amplitude of the primary current and has the same phase.
The beneficial effects are that: the signal conditioning unit and the low-pass filtering processing unit are used for processing signals output by the voltage sensor, the signal isolation unit and the signal amplification and integration operation unit are used for processing signals output by the Rogowski coil type current sensor, and the processed voltage signals and current signals are combined and output; the invention realizes the synchronous and accurate acquisition of current and voltage signals and improves the measurement accuracy and stability of the current and voltage data acquisition device under the interference of the external electromagnetic environment.
Furthermore, the signal conditioning unit is further configured to perform filtering processing on the analog small voltage signal output by the voltage sensor.
Furthermore, the voltage sensor signal processing module further comprises an interference suppression unit, an output end of the signal conditioning unit is connected with an input end of the interference suppression unit, an output end of the interference suppression unit is connected with an input end of the low-pass filtering processing unit, and the interference suppression unit is used for suppressing transient overvoltage interference in an output signal of the signal conditioning unit; the low-pass filtering processing unit is used for converting the output signal of the interference suppression unit into an analog signal which is in direct proportion to the amplitude of the primary voltage and has the same phase.
Further, the data processing module comprises an ADC analog-to-digital conversion circuit and an FPGA digital signal processing circuit, wherein the ADC analog-to-digital conversion circuit is configured to perform a/D sampling calculation and digital conversion processing on the two received signals; the FPGA digital signal processing circuit is used for carrying out digital calculation processing on an output signal of the ADC analog-digital conversion circuit, and converting the output signal into primary current and voltage data for framing, coding and outputting.
Further, the voltage sensor is a capacitance voltage division type voltage sensor or a resistance voltage division type voltage sensor.
Drawings
Fig. 1 is a schematic structural diagram of a current-voltage combined data acquisition device in an embodiment of the current-voltage combined data acquisition device of the present invention.
Detailed Description
The embodiment of the current-voltage combined data acquisition device comprises:
electronic voltage sensors can be classified into resistive voltage division type, resistive-capacitive voltage division type, and capacitive voltage division type sensors. Under the condition of high voltage, the resistance voltage division type sensor has higher requirements on insulating materials, has the problems of stability of a resistance element, corona discharge of a high-voltage electrode and the like, and introduces larger measurement errors; the transient performance of the resistance-capacitance voltage division type sensor is difficult to guarantee due to the existence of a differential processing loop and an integral processing loop; the electronic capacitance voltage division sensor directly transmits and transforms primary high-voltage signals in equal proportion by adopting a capacitance series voltage division principle, is mature in design in the application of a power system, and has good harmonic wave testing performance.
The electronic current sensors can be classified into all-fiber type, LPCT type, and Rogowski coil type current sensors. Under the condition of large current, the all-fiber current sensor has higher cost and is often applied to the voltage class of 500kV and above; the LPCT type current sensor is an electromagnetic type current sensor with low power output characteristic, and has poor measuring range and transient characteristic due to a core coil containing iron; the rogowski coil type current sensor is widely applied by adapting to the digital application requirements of an intelligent substation according to the characteristics of good measurement linearity, large dynamic range, wide frequency response, no magnetic saturation and the like.
In order to realize the synchronous and accurate acquisition of current and voltage signals and improve the measurement accuracy and stability of the current and voltage data acquisition device under the interference of an external electromagnetic environment, the embodiment combines the technical principle advantages of a capacitance voltage division type voltage sensor and a rogowski coil type current sensor, and provides a combined data acquisition device comprising the capacitance voltage division type voltage sensor and the rogowski coil type current sensor, as shown in fig. 1.
The current-voltage combined data acquisition device of the embodiment comprises a capacitance voltage division type voltage sensor, a Rogowski coil type current sensor, an analog signal isolation circuit, an operational amplification circuit, an ADC analog-digital conversion circuit and an FPGA digital signal processing circuit, wherein the ADC analog-digital conversion circuit and the FPGA digital signal processing circuit form a data processing module.
The capacitance voltage division type voltage sensor adopts a capacitance voltage division principle to realize voltage signal transmission of a primary conductor; the Rogowski coil type current sensor adopts Faraday law of electromagnetic induction and ampere loop law to realize transmission of current signals flowing through a primary conductor; the analog signal isolation circuit comprises a signal conditioning unit (namely signal conditioning in fig. 1), an interference suppression unit (namely interference suppression in fig. 1) and a signal isolation unit (namely signal isolation in fig. 1), wherein the signal conditioning unit is used for carrying out voltage division and filtering processing on an analog small voltage signal output by the voltage sensor, the interference suppression unit is used for suppressing transient overvoltage interference in the signal output by the signal conditioning unit, and the signal isolation unit is used for filtering high-frequency interference in the analog small voltage signal output by the rogowski coil type current sensor; the operational amplification circuit comprises a low-pass filtering processing unit (namely, low-pass filtering processing in fig. 1) and a signal amplifying and integrating operation unit (namely, signal amplifying and integrating operation in fig. 1), wherein the low-pass filtering processing unit is used for converting an output signal of the interference suppression unit into an analog signal which is in direct proportion to a primary voltage amplitude and has the same phase, and the signal amplifying and integrating operation unit is used for converting an output signal of the signal isolation unit into an analog signal which is in direct proportion to a primary current amplitude and has the same phase; the ADC analog-digital conversion circuit is used for carrying out A/D sampling calculation and digital conversion processing on the two analog signals; the FPGA digital signal processing circuit is used for carrying out digital calculation processing on an output signal of the ADC analog-digital conversion circuit, and converting the output signal into primary current and voltage data for framing, coding and outputting.
In this embodiment, the voltage sensor of the capacitive voltage division type is composed of a primary capacitor C1 and a secondary capacitor C2, and its transmission output signal is a simulated small voltage signal of 4/√ 3V at the rated primary voltage, and is substantially in phase with the primary voltage signal.
In this embodiment, the voltage division ratio of the capacitive voltage division sensor is:
in this embodiment, the output signal of the rogowski coil current sensor is a 2V analog small voltage signal at a rated primary current, and the phase lags behind the primary current by about 90 °.
Assuming that the Rogowski coil has a rectangular cross section, the cross sections of the Rogowski coil are consistent, and the Rogowski coil has uniform turns, and the Rogowski coil current sensor outputs transmission signals according to the electromagnetic induction law:
in the formula: i is the instantaneous current flowing through the primary conductor; mu.s04 π × 10 for vacuum permeability-7H/m; h is the height of the rectangular section of the framework; r2Is the outer diameter of the skeleton, R1Is the inner diameter of the framework; n is the total number of turns of the coil; m is the mutual inductance.
In the embodiment of the present invention, when the size of the rogowski coil frame, the diameter of the coil wire and the number of coil turns are all determined, and the coil mutual inductance M is a constant value, the current value i (t) output by the rogowski coil current sensor through the acquisition device is:
the Rogowski coil current sensor is used for transmitting and outputting a differential voltage signal, signal isolation, amplification and integral operation processing are required to be carried out, a micro-voltage signal which is in linear proportional relation with primary current is restored, and digital processing of an A/D sampling calculation level is carried out to obtain the primary current i (t) to be measured.
In the embodiment of the invention, electromagnetic interference conduction path factors are used as important influence parameters to condition secondary signals transmitted and transmitted by the capacitive voltage division sensor, so that transient overvoltage interference is inhibited at the input end of the voltage signal acquisition loop, and the reliability of voltage signal acquisition is improved; the Rogowski coil current transmission and transformation signals are subjected to signal isolation processing, so that the anti-electromagnetic interference performance of a current signal acquisition loop is improved, and the accuracy and reliability of current signal acquisition are improved.
In the embodiment, different transmission characteristics of the capacitance voltage division type voltage sensor and the Rogowski coil type current sensor are used as important influence parameters, and a secondary signal output by voltage transmission is subjected to signal low-pass filtering conditioning and converted into an analog signal which is in direct proportion to a primary voltage amplitude and has the same phase, and the analog signal is input into an ADC (analog-to-digital converter); the current-voltage combined data acquisition device performs signal amplification and integral operation processing on secondary signals output by current transmission and transformation, converts the secondary signals into analog signals with the same phase and in direct proportion to the amplitude of primary current, and inputs the analog signals into the ADC analog-digital conversion circuit, so that the analog outputs of the current and voltage sensors are accurately and synchronously acquired, and the accuracy and the stability of the measurement of the current-voltage combined data acquisition device are ensured.
The voltage sensor adopted in the embodiment is of a capacitive voltage division type, and is suitable for voltage classes above 35KV, and as other embodiments, when the voltage class is 10-35KV, a resistive voltage division type voltage sensor is adopted.
In this embodiment, an FPGA digital signal processing circuit is adopted, and as other embodiments, a DSP or other form of processing circuit may also be adopted to implement the function of the FPGA digital signal processing circuit in this embodiment.
In this embodiment, the signal conditioning unit is configured to perform voltage division and filtering processing on a signal output by the voltage sensor, and as another embodiment, the signal conditioning unit is only configured to perform voltage division processing on a signal output by the voltage sensor. In this embodiment, the analog signal isolation circuit is provided with an interference suppression unit, and as another embodiment, the interference suppression unit may not be provided, so that the signal conditioning unit in fig. 1 is directly connected to the low-pass filtering processing unit.
In this embodiment, the signal conditioning unit, the interference suppression unit, and the signal isolation unit are disposed on a circuit board, and the low-pass filtering processing unit and the signal amplification and integration operation unit are disposed on a circuit board.
Claims (5)
1. A current-voltage combined data acquisition device is characterized by comprising a voltage sensor and a Rogowski coil type current sensor; the output end of the voltage sensor is sequentially connected with the input ends of the signal conditioning unit, the low-pass filtering processing unit and the data processing module; the output end of the Rogowski coil type current sensor is sequentially connected with the input ends of the signal isolation unit, the signal amplification and integral operation unit and the data processing module; the data processing module processes the two received signals and then combines and outputs the signals;
the signal conditioning unit is used for carrying out voltage division processing on the analog small voltage signal output by the voltage sensor; the low-pass filtering processing unit is used for converting the output signal of the signal conditioning unit into an analog signal which is in direct proportion to the amplitude of the primary voltage and has the same phase; the signal isolation unit is used for filtering high-frequency interference in the analog small-voltage signal output by the Rogowski coil type current sensor, and the signal amplification and integration operation unit is used for converting the output signal of the signal isolation unit into an analog signal which is in direct proportion to the amplitude of the primary current and has the same phase.
2. The current-voltage combination data acquisition device of claim 1, wherein the signal conditioning unit is further configured to filter the analog small-voltage signal output by the voltage sensor.
3. The current-voltage combined data acquisition device according to claim 1, wherein the voltage sensor signal processing module further comprises an interference suppression unit, an output end of the signal conditioning unit is connected to an input end of the interference suppression unit, an output end of the interference suppression unit is connected to an input end of the low-pass filtering processing unit, and the interference suppression unit is configured to suppress transient overvoltage interference in an output signal of the signal conditioning unit; the low-pass filtering processing unit is used for converting the output signal of the interference suppression unit into an analog signal which is in direct proportion to the amplitude of the primary voltage and has the same phase.
4. The current-voltage combined data acquisition device according to claim 1, wherein the data processing module comprises an ADC analog-to-digital conversion circuit and an FPGA digital signal processing circuit, and the ADC analog-to-digital conversion circuit is configured to perform a/D sampling calculation and digital conversion processing on the two received signals; the FPGA digital signal processing circuit is used for carrying out digital calculation processing on an output signal of the ADC analog-digital conversion circuit, and converting the output signal into primary current and voltage data for framing, coding and outputting.
5. The current-voltage combination data collection device of claim 1, wherein the voltage sensor is a capacitive voltage division type voltage sensor or a resistive voltage division type voltage sensor.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114646798A (en) * | 2022-05-24 | 2022-06-21 | 青岛鼎信通讯股份有限公司 | Current sampling circuit and method applied to medium-voltage carrier |
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Effective date of registration: 20230814 Address after: No. 1298 Xuchang City, Henan province 461000 XJ Avenue Applicant after: XJ Group Corp. Applicant after: STATE GRID CORPORATION OF CHINA Applicant after: XJ ELECTRIC Co.,Ltd. Address before: No. 1298 Xuchang City, Henan province 461000 XJ Avenue Applicant before: XJ Group Corp. Applicant before: STATE GRID CORPORATION OF CHINA |