A kind of Road test system and method
阅读说明：本技术 一种负荷测试系统及方法 (A kind of Road test system and method ) 是由 姚红军 于 2019-09-10 设计创作，主要内容包括：本发明公开了一种负荷测试系统,包括电压测量模块、电流测量模块、信号处理电路模块、MCU控制器、显示器以及按键模块,该系统基于同步发生技术,通过电压测量模块和电流测量模块实现线路上电压信号和电流信号的采集,并通过信号处理电路模块进行信号处理,最后通过MCU控制器实现电压波形和电流波形的分析及相关参数的计算,实现对负荷状态的测试,该系统结构简单、可靠性高,相较于传统的带负荷测试方式更加便捷、安全、高效。(The invention discloses a kind of Road test systems, including voltage measurement module, current measurement module, signal processing circuit module, MCU controller, display and key module, the system is based on synchronous generation technique, the acquisition of voltage signal and current signal on route is realized by voltage measurement module and current measurement module, and signal processing is carried out by signal processing circuit module, the analysis of voltage waveform and current waveform and the calculating of relevant parameter are realized finally by MCU controller, realize the test to load condition, the system structure is simple, high reliablity, it is more convenient compared to traditional loading tests mode, safety, efficiently.)
1. a kind of Road test system, which is characterized in that including voltage measurement module, current measurement module, signal processing circuit Module, MCU controller, display and key module, the voltage measurement module and current measurement module with the signal Processing circuit module electrical connection, the signal processing circuit module, display and key module are electric with the MCU controller Connection；
The voltage measurement module is measured for A, B, C three-phase voltage to tested point on route, obtains alternating voltage letter Number；
The current measurement module is measured for A, B, C three-phase current to tested point on route, obtains alternating current letter Number；
The signal processing circuit module, for the ac voltage signal and ac current signal carry out multi-channel sampling and Analog-to-digital conversion process obtains measurement voltage waveform and measures current waveform；
The MCU controller, for the measurement voltage waveform and measurement current waveform to be analyzed and processed, according in waveform Voltage magnitude and current amplitude, are calculated active power and reactive power；
The display is shown in real time for that will measure voltage waveform, measurement current waveform, active power and reactive power Show；
The key module, inputs operation instruction for user.
2. a kind of Road test system according to claim 1, which is characterized in that the voltage measurement module is by two points Piezoresistance is composed in series.
3. a kind of Road test system according to claim 2, which is characterized in that two divider resistances are high-precision Close RJ711 type divider resistance.
4. a kind of Road test system according to claim 1, which is characterized in that the current measurement module includes Hall Current sensor and resistance R136, the output end of the Hall current sensor and the resistance R136Electrical connection, the Hall electricity The output end of flow sensor is also electrically connected with the signal processing circuit module.
5. a kind of Road test system according to claim 4, which is characterized in that the Hall current sensor is CHB- 25NP type sensor.
6. a kind of Road test system according to claim 1, which is characterized in that the signal processing circuit module includes Multi-channel sampling chip and modulus conversion chip, the input terminal of the multi-channel sampling chip and the voltage measurement module and institute Current measurement module electrical connection is stated, the output end of the multi-channel sampling chip is electrically connected with the modulus conversion chip, described Modulus conversion chip is also electrically connected with the MCU controller.
7. a kind of load testing method, which comprises the following steps:
Step 1: treating survey line road respectively and carry out alternating voltage detection and alternating current detection；
Step 2: the ac voltage signal and ac current signal obtain to detection carries out sampling and analog-to-digital conversion process, is surveyed Voltage waveform and measurement current waveform are measured, and is shown；
Step 3: will measure voltage waveform or measure in current waveform becomes the point of positive value as zero point, respectively to measurement from negative value The position of zero crossing and time are analyzed and determined in voltage waveform and measurement current waveform, so to current phase and amplitude with And voltage-phase and amplitude are calculated；
Step 4: being obtained according to current amplitude and voltage magnitude calculated load size, and according to the phase difference calculating of electric current and voltage The size of burden with power and load or burden without work realizes the test to load condition.
8. a kind of load testing method according to claim 7, which is characterized in that counted in step 3 to current phase It calculates, calculation formula are as follows:
φ=2nt π/T
In formula, φ is the phase of electric current, and t is the sampling interval, and T is the period of waveform；
Current amplitude is calculated, calculation formula are as follows:
In formula, wherein IrmsFor the virtual value of electric current；M is the number of samples of a cycle, and I is sampled value.
9. a kind of load testing method according to claim 7, which is characterized in that counted in step 3 to voltage magnitude It calculates, calculation formula are as follows:
In formula, UrmsFor the virtual value of voltage, m is the number of samples of a cycle, and U is sampled value.
10. a kind of load testing method according to claim 7, which is characterized in that calculate the big of burden with power in step 4 It is small, calculation formula are as follows:
In formula, UrmsFor the virtual value of voltage, IrmsFor the virtual value of electric current, φ is the phase difference of electric current and voltage；
The size of load or burden without work, calculation formula is calculated are as follows:
In formula, UrmsFor the virtual value of voltage, IrmsFor the virtual value of electric current, φ is the phase difference of electric current and voltage.
Technical field
The present invention relates to electric system loading tests technical field, more particularly to a kind of Road test system And method.
Background technique
Currently, when substation puts into operation the loading tests of current loop need to be carried out, with 220kV route and 110kV route For load test, in order to which whether the phase for comparing electric current is correct, conventional way is usually required with same voltage source at present For reference, the data such as size and the phase of electric current are measured.
But there are such problems in measurement process for existing method: in different local on-loads, if Two place distances farther out, can not take and bring larger workload to measurement when identical voltage source, while increase safety Hidden danger.
Therefore, how a kind of safe and convenient is provided and accurately and reliably Road test system and method is art technology The problem of personnel's urgent need to resolve.
Summary of the invention
In view of this, the system is based on synchronous generation technique, system structure the present invention provides a kind of Road test system Simply, high reliablity and safe and efficient, solves traditional loading tests mode inefficiency and security risk is difficult to overcome The problem of.
To achieve the goals above, the present invention adopts the following technical scheme:
On the one hand, the present invention provides a kind of Road test system, which includes voltage measurement module, current measurement mould Block, signal processing circuit module, MCU controller, display and key module, the voltage measurement module and current measurement mould Block is electrically connected with the signal processing circuit module, the signal processing circuit module, display and key module with The MCU controller electrical connection；
The voltage measurement module measures for A, B, C three-phase voltage to tested point on route, obtains alternating current Press signal；
The current measurement module measures for A, B, C three-phase current to tested point on route, obtains alternating current Flow signal；
The signal processing circuit module is adopted for carrying out multichannel to the ac voltage signal and ac current signal Sample and analog-to-digital conversion process obtain measurement voltage waveform and measure current waveform；
The MCU controller, for the measurement voltage waveform and measurement current waveform to be analyzed and processed, according to wave Voltage magnitude and current amplitude, are calculated active power and reactive power in shape；
The display carries out in real time for that will measure voltage waveform, measurement current waveform, active power and reactive power Display；
The key module, inputs operation instruction for user.
Further, the voltage measurement module is composed in series by two divider resistances.
Further, two divider resistances are high-accuracy RJ711 type divider resistance.
Further, the current measurement module includes Hall current sensor and resistance R136, the Hall current sensing The output end of device and the resistance R136Electrical connection, the output end of the Hall current sensor also with the signal processing circuit Module electrical connection.
Further, the Hall current sensor is CHB-25NP type sensor.
Further, the signal processing circuit module includes multi-channel sampling chip and modulus conversion chip, described more The input terminal of channel sample chip is electrically connected with the voltage measurement module and the current measurement module, the multi-channel sampling The output end of chip is electrically connected with the modulus conversion chip, and the modulus conversion chip is also electrically connected with the MCU controller.
On the other hand, the present invention also provides a kind of load testing methods, method includes the following steps:
Step 1: treating survey line road respectively and carry out alternating voltage detection and alternating current detection；
Step 2: the ac voltage signal and ac current signal obtain to detection carries out sampling and analog-to-digital conversion process, obtains To measurement voltage waveform and measurement current waveform, and shown；
Step 3: will measure voltage waveform or measure in current waveform becomes the point of positive value as zero point from negative value, right respectively The position of zero crossing and time are analyzed and determined in measurement voltage waveform and measurement current waveform, and then to current phase and width Value and voltage-phase and amplitude are calculated；
Step 4: according to current amplitude and voltage magnitude calculated load size, and according to the phase difference calculating of electric current and voltage The size of burden with power and load or burden without work is obtained, realizes the test to load condition.
Further, current phase is calculated in step 3, calculation formula are as follows:
φ=2nt π/T
In formula, φ is the phase of electric current, and t is the sampling interval, and T is the period of waveform；
Current amplitude is calculated, calculation formula are as follows:
In formula, wherein IrmsFor the virtual value of electric current；M is the number of samples of a cycle, and I is sampled value.
Further, voltage magnitude is calculated in step 3, calculation formula are as follows:
In formula, UrmsFor the virtual value of voltage, m is the number of samples of a cycle, and U is sampled value.
Further, the size of burden with power, calculation formula are calculated in step 4 are as follows:
In formula, UrmsFor the virtual value of voltage, IrmsFor the virtual value of electric current, φ is the phase difference of electric current and voltage；
The size of load or burden without work, calculation formula is calculated are as follows:
In formula, UrmsFor the virtual value of voltage, IrmsFor the virtual value of electric current, φ is the phase difference of electric current and voltage.
It can be seen via above technical scheme that compared with prior art, the present disclosure provides a kind of Road test systems System, the system are based on synchronous generation technique, by voltage measurement module and current measurement module realize on route voltage signal and The acquisition of current signal, and signal processing is carried out by signal processing circuit module, voltage wave is realized finally by MCU controller The analysis of shape and current waveform and the calculating of relevant parameter, realize test to load condition, and the system structure is simple, reliability Height, it is more convenient, safe and efficient compared to traditional loading tests mode.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis The attached drawing of offer obtains other attached drawings.
Fig. 1 attached drawing is a kind of overall structure configuration diagram of Road test system provided by the invention；
Fig. 2 attached drawing is voltage waveform measuring principle schematic diagram in the embodiment of the present invention；
Fig. 3 attached drawing is current waveform measuring principle schematic diagram in the embodiment of the present invention；
Fig. 4 attached drawing is voltage measurement module circuit theory schematic diagram in the embodiment of the present invention；
Fig. 5 attached drawing is current measurement module circuit theory schematic diagram in the embodiment of the present invention；
Fig. 6 attached drawing is the connection relationship circuit theory of signal processing circuit module and MCU controller in the embodiment of the present invention Schematic diagram；
Fig. 7 attached drawing is a kind of method flow schematic diagram of load testing method provided by the invention；
Fig. 8 attached drawing is electric current and voltage waveform view in the embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other Embodiment shall fall within the protection scope of the present invention.
On the one hand, referring to attached drawing 1, the embodiment of the invention discloses a kind of Road test system, which includes that voltage is surveyed Measure module 2, current measurement module 1, signal processing circuit module 3, MCU controller 4, display 5 and key module 6, voltage Measurement module 2 and current measurement module 1 are electrically connected with signal processing circuit module 3, signal processing circuit module 3, display 5 And key module 6 is electrically connected with MCU controller 4；
Voltage measurement module 2 measures for A, B, C three-phase voltage to tested point on route, obtains alternating voltage Signal；
Current measurement module 1 measures for A, B, C three-phase current to tested point on route, obtains alternating current Signal；
Signal processing circuit module 3, for carrying out multi-channel sampling and mould to ac voltage signal and ac current signal Number conversion process obtains measurement voltage waveform and measures current waveform；
MCU controller 4 is analyzed and processed, according to electric in waveform for that will measure voltage waveform and measurement current waveform Pressure amplitude value and current amplitude, are calculated active power and reactive power；
Display 5 is shown in real time for that will measure voltage waveform, measurement current waveform, active power and reactive power Show；
Key module 6, inputs operation instruction for user.
Specifically, the measurement that voltage measurement module 2 is timed measurement to A, B, C three-phase voltage of tested point on route is former Reason is as shown in Fig. 2, measuring principle such as Fig. 3 that current measurement module 1 measures A, B, C three-phase current of tested point on route It is shown.
Specifically, referring to attached drawing 4, voltage measurement module 2 is composed in series by two divider resistances.
In a specific embodiment, two divider resistances are high-accuracy RJ711 type divider resistance.
Specifically, referring to attached drawing 5, current measurement module 1 includes Hall current sensor and resistance R136, Hall current biography The output end and resistance R of sensor136Electrical connection, the output end of Hall current sensor are also electrically connected with signal processing circuit module 3 It connects.
In a specific embodiment, Hall current sensor is CHB-25NP type sensor.The present embodiment is chosen CHB-25NP type sensor passes through resistance as systematic survey element, by 0~25mA electric current that Hall sensor measurement obtains R136, 0~5V of voltage signal is converted it into, the measurement to electric current is then realized by the conversion to voltage signal.
Specifically, signal processing circuit module 3 includes multi-channel sampling chip and modulus conversion chip, multi-channel sampling core The input terminal of piece is electrically connected with voltage measurement module 2 and current measurement module 1, and the output end and modulus of multi-channel sampling chip turn Chip electrical connection is changed, modulus conversion chip is also electrically connected with MCU controller 4.
In a specific embodiment, multi-channel sampling chip selects the 16 of model CD4067 1 bidirectional analog is selected to open Chip is closed, modulus conversion chip selects 12, MAX1241 type A/D conversion chips, and MCU controller selects model STC89C51 Single-chip microcontroller, singlechip chip interface use three general purpose Is/O port P1.0~P1.2, wherein P1.1 be used for chip selection signal, P1.2 is data input, and P1.0 generates driving pulse SCLK.Its course of work are as follows: system is first with P1 mouthfuls of No. 7 feet pair CD4067 carries out piece choosing, then the selection to 16 tunnel analog signals is realized using the signal of P1.3-P1.6, by selected signal It is input to the analog signal input port of MAX1241, the conversion to signal is realized by the setting to P1.0~P1.2.
Specifically, referring to attached drawing 6,1 pin and 3 pins of A/D conversion chip MAX1241 connects+5V power supply, 2 pins and survey Circuit connection is measured, 4 pins are connect with+10V power supply, and are grounded by capacitor C7, and 6 pins of A/D conversion chip MAX1241,7 are drawn Foot, 8 pins are successively connect with the port P1.2, P1.1, P1.0 of STC89C51 single-chip microcontroller respectively, A/D conversion chip MAX1241's 5 pins ground connection.
In addition, the periphery of STC89C51 single-chip microcontroller is additionally provided with the reset electricity being made of key S2 capacitor C14 and resistance R41 Road, the crystal oscillating circuit being made of capacitor C12, capacitor C13 and crystal oscillator Y2, and by R61, R62, R65, R67, R70, R72, R73, The pull-up resistor of R74 composition.
On the other hand, the embodiment of the invention also discloses a kind of load testing methods, method includes the following steps:
S1: survey line road is treated respectively and carries out alternating voltage detection and alternating current detection；
S2: the ac voltage signal and ac current signal obtain to detection carries out sampling and analog-to-digital conversion process, obtains Voltage waveform and measurement current waveform are measured, and is shown；As shown in fig. 7, for measurement voltage waveform and measurement current waveform；
S3: will measure voltage waveform or measure in current waveform becomes the point of positive value as zero point, respectively to survey from negative value The position of zero crossing and time are analyzed and determined in amount voltage waveform and measurement current waveform, and then to current phase and amplitude And voltage-phase and amplitude are calculated；
S4: it is obtained according to current amplitude and voltage magnitude calculated load size, and according to the phase difference calculating of electric current and voltage To the size of burden with power and load or burden without work, the test to load condition is realized.
In a specific embodiment, current phase is calculated in step S3, calculation formula are as follows:
φ=2nt π/T
In formula, φ is the phase of electric current, and t is the sampling interval, and it is herein 20ms that T, which is the period of waveform,；
Current amplitude is calculated, calculation formula are as follows:
In formula, wherein IrmsFor the virtual value of electric current；M is the number of samples of a cycle, and I is sampled value.
In a specific embodiment, voltage magnitude is calculated in step 3, calculation formula are as follows:
In formula, UrmsFor the virtual value of voltage, m is the number of samples of a cycle, and U is sampled value.
In a specific embodiment, the size of burden with power, calculation formula are calculated in step S4 are as follows:
In formula, UrmsFor the virtual value of voltage, IrmsFor the virtual value of electric current, φ is the phase difference of electric current and voltage；
The size of load or burden without work, calculation formula is calculated are as follows:
In formula, UrmsFor the virtual value of voltage, IrmsFor the virtual value of electric current, φ is the phase difference of electric current and voltage.
It can be seen via above technical scheme that compared with prior art, Road test system provided in this embodiment passes through Voltage measurement module and current measurement module realize the acquisition of voltage signal and current signal on route, and pass through signal processing electricity Road module carries out signal processing, and analysis and the relevant parameter of voltage waveform and current waveform are realized finally by MCU controller It calculates, realizes test to load condition, the system structure is simple, high reliablity, compared to traditional loading tests mode It is more convenient, safe and efficient.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other The difference of embodiment, the same or similar parts in each embodiment may refer to each other.For device disclosed in embodiment For, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is said referring to method part It is bright.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one The widest scope of cause.
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