CN110441622A - Wireless on-load vector test instrument - Google Patents
Wireless on-load vector test instrument Download PDFInfo
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- CN110441622A CN110441622A CN201810406805.4A CN201810406805A CN110441622A CN 110441622 A CN110441622 A CN 110441622A CN 201810406805 A CN201810406805 A CN 201810406805A CN 110441622 A CN110441622 A CN 110441622A
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- 238000012360 testing method Methods 0.000 title claims abstract description 14
- 238000005259 measurement Methods 0.000 claims abstract description 76
- 238000004891 communication Methods 0.000 claims abstract description 17
- 239000002131 composite material Substances 0.000 claims abstract description 5
- 230000001360 synchronised effect Effects 0.000 description 10
- 230000005540 biological transmission Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000004044 response Effects 0.000 description 5
- 230000005611 electricity Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000012935 Averaging Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- HEZMWWAKWCSUCB-PHDIDXHHSA-N (3R,4R)-3,4-dihydroxycyclohexa-1,5-diene-1-carboxylic acid Chemical compound O[C@@H]1C=CC(C(O)=O)=C[C@H]1O HEZMWWAKWCSUCB-PHDIDXHHSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
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- 230000001934 delay Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000000819 phase cycle Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
The present invention relates to a kind of wireless on-load vector test instrument for power measurement field.Including a voltage reference and a measurement host, between the two using wireless communication.Voltage reference and measurement host respectively have power supply, using synchronic command, realize that different measurement points are calculated based on the synchro measure of the electrical parameters such as frequency, amplitude, the phase of voltage, electric current between voltage reference.Measurement host can not only work independently, and complete the survey calculation of three-phase voltage, three-phase current signal items electrical parameter；Can also with voltage reference be reference, carry out repeatedly separately measurement, save data, by all input measurement results with voltage reference composite calulation after, be unified in a vectogram and directly display over the display, to carry out PT nuclear phase and on-load vector test.It is a kind of amplitude for being conveniently suitable for intelligent substation, signal between multiple and different places capable of being measured and phase, the hand-held instrument for carrying out on-load vector test, directly displaying hexagonal figure.
Description
Technical field
The present invention relates to a kind of wireless on-load vector test instrument for power measurement field.
Background technique
When substation's commissioning of new equipment or the modified equipment of electric current secondary loop restore power transmission, need to carry out on-load
Vector test, i.e., measurement three-phase load electric current virtual value and relative to reference voltage phase and judge phase sequence, to detect two
The correctness of primary current, voltage circuit, and then guarantee the correct movement of protection.In the test of conventional substation, voltage, current-mode
After analog quantity is all located at same protective device screen, it can be easily accomplished by three-phase phase volt ampere meter, but in intelligent substation,
There is no voltage, the analog input of electric current after protection screen, the analog quantity of voltage is located in busbar voltage combining unit, electric current
Analog quantity is located in each interval combining unit, and the two is at a distance of several meters or even tens of rice, and therefore, the test of on-load vector is exactly
The problem of some opposite difficulty.It is also required in conventional transform er differential protection respectively by the basis of high tension voltage, while measuring height
In low three side electric current amplitude and phase, to differentiate to second loop return wiring.
Currently, domestic mainstream digit phase volt ampere meter is all made of the mode an of host, multiple inputs, it is only applicable to electricity
Pressure, current-mode analog quantity are the same as the traditional substation shielded.For surveying the research of phase technology at a distance or being synchronized using GPS signal,
It is using special synchronous impulse line.Synchronous using GPS signal, hardware is complicated, at high cost；It is wanted using special synchronous impulse line
It is laid with private cable, it has not been convenient to use.Therefore the country there is no it is a kind of be conveniently suitable for intelligent substation, can measure it is more
The amplitude and phase of signal between a different location, the hand-held instrument for carrying out on-load vector test, directly displaying hexagonal figure
Table.
Summary of the invention
To solve above-mentioned status, the present invention provides a kind of wireless on-load vector test instrument.Wireless on-load is to measurement
Trying instrument includes a voltage reference and a measurement host, between the two using wireless communication.Voltage reference and measurement host are each
Frequency, amplitude, phase of the different measurement points based on voltage, electric current between voltage reference are realized using synchronic command with power supply
The synchro measure of the electrical parameters such as position calculates.Measurement host can not only work independently, and it is every to complete three-phase voltage, three-phase current signal
The survey calculation of electrical parameter；It can also be reference with voltage reference, carry out repeatedly separately measurement, data are saved, by all inputs
It after measurement result is with voltage reference composite calulation, is unified in a vectogram and directly displays over the display, to carry out PT
Nuclear phase and on-load vector test.
The voltage reference includes voltage measurement circuit, display, processor, clock module, serial wireless communication module
And power circuit.Voltage signal by input port access voltage measurement circuit be filtered, shaping, the processing such as amplification；Voltage
The output signal of measurement route is connect with processor；Processor is connected to display, for showing metrical information；Clock module
System clock is provided, processor is connected to, the starting of each measuring signal is controlled for processor；Serial wireless communication module with
Processor connection, for voltage reference with the communication between measurement host.
The measurement host includes voltage measurement circuit, current measurement route, display, processor, memory, clock mould
Block, serial wireless communication module and power circuit.Voltage, current signal access corresponding measurement route by input port and are filtered
The processing such as wave, shaping, amplification；The output signal of measurement route is connect with processor；Processor is connected to display, for that will survey
Amount information is shown；Memory is for saving each individual measurement result；Clock module provides system clock, is connected to processing
Device controls the starting of each measuring signal for processor；Serial wireless communication module is connect with processor, for measuring host
With the communication between voltage reference.
When tester of the present invention measures:
Serial radio receiving transmitting module is first passed through before measurement host-initiated measurement and sends synch command to voltage reference, and is recorded
It measures host clock and issues the moment, when voltage reference receives synch command, also recording voltage reference clock moment, voltage reference are connect
After the completion of receipts, to measurement host response sync response order, clock is sended and received with voltage reference, measurement host receives
To when sync response order, record measurement host receives clock time, using this four clock times, can calculate measurement master
The clock skew and transmission delay of machine and voltage reference.According to clock skew adjust measurement host clock and voltage reference when
Clock is synchronous, and according to transmission delay, setting measures Startup time next time, and measurement host issues starting measurement to voltage reference and refers to
It enables, measures host and voltage reference carves synchronous averaging measurement on startup.Host is measured after being measured passes through serial channel radio
Believe that module reads voltage reference measurement result, and calculates the electricity such as amplitude, the phase in each channel between voltage reference and measurement host and join
Relationship between several or signal, and result is exported to display and is shown.And each measurement result can be saved in memory,
After multiple result is with voltage reference composite calulation, it is unified in a vectogram and directly displays over the display.
Detailed description of the invention
The particular content that the present invention is furture elucidated with reference to the accompanying drawings and embodiments:
Fig. 1: the overall structure diagram of the present embodiment；
Fig. 2: the present embodiment voltage reference structural schematic diagram；
Fig. 3: the present embodiment measures main machine structure schematic diagram；
Fig. 4: the present embodiment measures synchronous schematic diagram.
Specific embodiment
Referring to Fig.1, the present embodiment includes voltage reference 1, measurement host 6；Wherein voltage reference include voltage input end 3,
Display 2, dual-mode antenna 4 and power switch 5；Wherein measurement host includes voltage input end 8, current input terminal 9, display 7
And dual-mode antenna 10 and power switch 11.
It is the voltage reference structure chart referring to Fig. 2, voltage input end 3 accesses voltage measurement circuit 12；12 output letter
It number is connected to processor 13, processor connects display 2, and for showing measurement result, clock module 14 is located inside processor,
Serial wireless communication module 19 is connected to processor, and wireless receiving and dispatching antenna 4 connects 19, and power module 20 provides work power supply.
It is the measurement host structure chart referring to Fig. 3, three road voltage input ends 8 access voltage measurement circuit 21；Three roads electricity
It flows input terminal 9 and accesses current measurement route 22；21,22 output signal is connected to processor 23, and processor connects display 7,
For showing measurement result, clock module 24 is located inside processor, and memory 26 is connected to processor, serial radio communication mold
Block 25 is connected to processor, and wireless receiving and dispatching antenna 10 connects 25, and power module 27 provides work power supply.
In the specific implementation, any kind single-chip microcontroller with AD in piece may be selected in processor, such as stm32 series monolithic
Or MSP430 series monolithic；Voltage and current measurement route is common AC sampling filtering and amplifying circuit；Display 2 may be selected
SPI serial line interface may be selected with processor in single-color dot matrix LCD, and the TFT display screen with touch function may be selected in display 7, can be with
Different screen resolutions is selected according to their own needs；Serial wireless communication module according to communication distance may be selected 2.4G or
External FLASH chip such as W25Q128 may be selected in 433MHz different capacity module, memory；Chargeable lithium may be selected in power circuit
Battery and DCDC circuit.
Referring to Fig. 4, synchronous schematic diagram is measured for this example, time shaft 28 is voltage reference clock, and time shaft 29 is measurement
Host clock, measurement host in 35 moment t1 send synch command 32 to voltage reference, when voltage reference receives synch command,
Record 36 voltage reference clock time t2, after voltage reference finishes receiving, in 37 voltage reference clock time t3 to measurement host
It replys and sends sync response order, t2 and t3 is had in order, when measurement host receives sync response order, 38 measurement of record
Host receives clock time t4, using this four clock times, when can calculate the Offset for measuring host and voltage reference
Clock deviates 30 and Delay transmission delay 31.
T2-t1=Delay+Offset
T4-t3=Delay-Offset
Therefore: Delay=((t2-t1)+(t4-t3))/2
Offset=((t2-t1)-(t4-t3))/2
The clock for adjusting measurement host according to clock skew is synchronous with the clock of voltage reference, according to transmission delay, setting
Startup time 39 is measured next time, and measurement host issues starting measurement instruction 34 to voltage reference, when measurement instruction is with starting
It carves, measures host and voltage reference carves synchronous averaging measurement on startup.Host is measured after being measured passes through serial channel radio
Believe that module reads voltage reference measurement result, and calculates the electricity such as amplitude, the phase in each channel between voltage reference and measurement host and join
Relationship between several or signal, and result is exported to display and is shown.And each measurement result can be saved in memory,
After multiple result is with voltage reference composite calulation, it is unified in a vectogram and directly displays over the display.
Since there are certain delays from reception is sent to for wireless communication, specific delay is by environment and aerial rate and number
Influenced according to the size of packet, but it is same under the conditions of delay time be fixed.It is computed and surveys, the method is reliable and stable
Method for synchronously measuring, measurement result precision can meet measurement request.
Claims (5)
1. a kind of wireless on-load vector test instrument for electric system, including a voltage reference and a measurement host；
The voltage reference includes voltage measurement circuit, display, processor, clock module, wireless communication module；The measurement
Host includes voltage measurement circuit, current measurement route, display, processor, memory, clock module, wireless communication module；
It is characterized in that using wireless communication between voltage reference and measurement host, by all input multiple measurement results with voltage
Unifying datum directly displays over the display in a vectogram, realizes on-load vector test.
2. voltage reference according to claim 1, it is characterised in that: can work independently, realize to ac voltage signal
Frequency and amplitude survey calculation.
3. measurement host according to claim 1, it is characterised in that: can work independently, realize to three-phase voltage, three-phase
The frequency of current signal, amplitude, phase, power parameter survey calculation.
4. wireless on-load vector measurement instrument according to claim 1, it is characterised in that: voltage reference and measurement host it
Between for wireless communication, using synchronic command, realize frequency based on voltage, electric current between voltage reference difference measurement point, amplitude,
The synchro measure of the electrical parameters such as phase calculates.
5. wireless on-load vector measurement instrument according to claim 1, it is characterised in that: can with same voltage reference into
Row repeatedly separately measurement, save data, will repeatedly save result with same voltage reference carry out composite calulation, be unified in one to
It is directly displayed in spirogram.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810406805.4A CN110441622A (en) | 2018-05-02 | 2018-05-02 | Wireless on-load vector test instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810406805.4A CN110441622A (en) | 2018-05-02 | 2018-05-02 | Wireless on-load vector test instrument |
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| CN110441622A true CN110441622A (en) | 2019-11-12 |
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| CN201810406805.4A Pending CN110441622A (en) | 2018-05-02 | 2018-05-02 | Wireless on-load vector test instrument |
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|---|---|---|---|---|
| CN101614778A (en) * | 2009-07-23 | 2009-12-30 | 西安爱邦电气有限公司 | The connection analysis method of electric relay protection circuit |
| CN101738600A (en) * | 2008-11-14 | 2010-06-16 | 武汉大学 | High-frequency ground wave radar networking clock synchronization control method and device thereof |
| CN202171619U (en) * | 2011-08-08 | 2012-03-21 | 江苏省电力公司仪征市供电公司 | Personal Digital Assistant (PDA) phase volt-ampere tester |
| CN104808106A (en) * | 2015-04-02 | 2015-07-29 | 广州供电局有限公司 | Electrical equipment local discharge positioning method and system |
| CN104880624A (en) * | 2015-04-24 | 2015-09-02 | 国网四川省电力公司电力科学研究院 | Wireless test system used for transformer substation system debugging and wireless measurement method used for transformer substation system debugging |
| CN204807612U (en) * | 2015-05-20 | 2015-11-25 | 西安双英科技有限公司 | Wireless phase place volometer |
| CN206057436U (en) * | 2016-10-14 | 2017-03-29 | 国网安徽省电力公司芜湖供电公司 | Without phase of line volt-ampere tester |
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2018
- 2018-05-02 CN CN201810406805.4A patent/CN110441622A/en active Pending
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| CN104808106A (en) * | 2015-04-02 | 2015-07-29 | 广州供电局有限公司 | Electrical equipment local discharge positioning method and system |
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