CN107219391A - Quality of voltage Monitoring Indexes device - Google Patents
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- CN107219391A CN107219391A CN201710446338.3A CN201710446338A CN107219391A CN 107219391 A CN107219391 A CN 107219391A CN 201710446338 A CN201710446338 A CN 201710446338A CN 107219391 A CN107219391 A CN 107219391A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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Abstract
The present invention relates to a kind of quality of voltage Monitoring Indexes device, including signal conditioning circuit, voltage measurement unit, main control unit, data communication units and data storage cell；The voltage signal sampling of Circuit Fault on Secondary Transformer is transformed to analog signalses by signal conditioning circuit；Analog signalses are converted to digital quantity signal by voltage measurement unit；Main control unit calculates a series of indexs of voltage signal, and the control signal of output control data communication units based on digital quantity signal respectively in real time；Data communication units are realized under control of the control signal transmits a series of indexs of voltage signal to transformer station's electricity and quality of power supply Integrated Management；Data storage cell stores a series of indexs of voltage signal.The present invention's can carry out comprehensive monitoring to every quality of voltage index in transformer station, so that the problem of existing for transformer station's supply voltage index provides effective information, administered for electricity quality evaluation and provide quantitative basis.
Description
Technical field
The present invention relates to a kind of quality of voltage Monitoring Indexes device applied to transformer station.
Background technology
With increasingly improving for people's living standard and opening increasingly for Power Market, the power quality problem of power network
Increasingly paid close attention to by people.Quality of voltage index is an important component of the quality of power supply, is to weigh power supply quality
A series of good and bad indexs, it includes：Voltage deviation, harmonic wave, imbalance of three-phase voltage, voltage fluctuation and flicker, voltage are temporary
Liter and voltage dip, frequency etc..The quality of supply voltage quality, will directly influence safe operation and the product matter of customer equipment
The quality of amount, is the important connotation that power grid enterprises lift service level.The quality of supply voltage quality directly reflects power network pipe
The height of department technology level is managed, whether reflect electric network composition reasonable, therefore it is both vast to improve for supply voltage quality
Electric user expectation, is also one of the key technical indexes that power supply enterprise must reach, is an important base of business administration work
Plinth works, and is also a comprehensive sex work.
《Quality of power supply supply voltage deviation》(GB/T12325-2008)、《Quality of power supply voltage fluctuation and flicker》(GB/
T12326-2008)、《Quality of power supply imbalance of three-phase voltage》(GB/T15543-2008)、《Quality of power supply utility network harmonic wave》
(GB/T14549-1993)、《Quality of power supply voltage dip and short interruptions》(GB/T30137-2013)、《Quality of power supply power train
System frequency departure》Etc. (GB/T15945-2008) standard has made clear and definite definition for the requirement of index of correlation, for this reason, it may be necessary to
It is a kind of applied to the quality of voltage Monitoring Indexes device of transformer station to monitor the situation of every power supply quality index, for assess administer
The foundation quantified is provided.
The content of the invention
Every quality of voltage index can comprehensively be supervised suitable for transformer station it is an object of the invention to provide one kind
The device of survey.
To reach above-mentioned purpose, the technical solution adopted by the present invention is：
A kind of quality of voltage Monitoring Indexes device, is connected with the transformer secondary side bus of transformer station and is used to monitor institute
The quality of the voltage signal of Circuit Fault on Secondary Transformer is stated, the quality of voltage Monitoring Indexes device includes signal conditioning circuit, voltage
Measuring unit, main control unit, data communication units and data storage cell；
The signal conditioning circuit is connected with the transformer secondary side bus, and the signal conditioning circuit is in real time by institute
The voltage signal sampling for stating Circuit Fault on Secondary Transformer is transformed to the analog signalses that the voltage measurement unit can be handled；
The voltage measurement unit is connected with the signal conditioning circuit, and the voltage measurement unit adjusts the signal
The analog signalses of reason circuit output are converted to the digital quantity signal that the main control unit can be handled；
The main control unit is connected with the voltage measurement unit, and the main control unit is based on the voltage measurement unit
The digital quantity signal of output calculates a series of indexs of the voltage signal respectively in real time, and the main control unit can also export control
Make the control signal of the data communication units；
The data communication units are connected with the main control unit, and pass through communication network and transformer station's electricity and electric energy
Quality integration management system is connected, and the data communication units are realized the voltage under the control of said control signal
A series of indexs of signal are transmitted to transformer station's electricity and quality of power supply Integrated Management；
The data storage cell is connected with the main control unit and stores a series of indexs of the voltage signal；
A series of indexs of the voltage signal include voltage deviation index, voltage fluctuation and flicker index, three-phase voltage
Uneven index, public electric wire net harmonic wave index, voltage dip and short interruptions index, power system frequency Deviation Indices.
Magnitude of voltage and the recording voltage monitoring time of the voltage signal of the Circuit Fault on Secondary Transformer are monitored, the voltage is judged
Whether value exceedes allowed limit value and counts the voltage overtime that the magnitude of voltage exceedes allowed limit value, according toCalculating voltage transfinites rate, is transfinited rate meter further according to rate of qualified voltage=1- voltages
Rate of qualified voltage is calculated, the rate of qualified voltage is used to characterize the voltage deviation index.
Statistics calculating is carried out again after first rejecting the dead voltage value beyond Un (1 ± 22%) scope, it is described to permit
Perhaps limit value includes higher limit and lower limit, and the higher limit is Un (1+7%), and the lower limit is Un (1-
10%), wherein Un is rated voltage, and the voltage overtime includes the super upper limit time of voltage and voltage super lower limit time,
Calculate the voltage fluctuation and flicker and refer to calibration method and be：First pass through sampling and calculate the voltage signal in short-term
Between voltage flicker index, calculate long-time voltage flicker index further according to multiple short time voltage flicker indexs, judge
Whether the long-time voltage flicker index is exceeded and records the flickering overtime of the long-time voltage flicker index exceeding standard,
According toFlickering qualification rate is calculated, the flickering qualification rate is used for table
Levy the voltage fluctuation and flicker index.
Calculate the imbalance of three-phase voltage and refer to calibration method and be：Amplitude and phase calculation based on three-phase voltage are just
Order components, negative sequence component and zero-sequence component, further according toThe imbalance of three-phase voltage rate is calculated, is judged
Whether the imbalance of three-phase voltage rate transfinites and records the imbalance of three-phase voltage rate overtime, according toCalculate three-phase voltage not
Balanced ratio qualification rate, the imbalance of three-phase voltage rate qualification rate is used to characterize the imbalance of three-phase voltage index, wherein, U1
For the positive-sequence component root-mean-square valve of three-phase voltage, U2For the negative sequence component root-mean-square valve of three-phase voltage, U0For the zero sequence of three-phase voltage
Component root-mean-square valve.
Calculate the public electric wire net voltage harmonic and refer to calibration method and be：FFT decomposition is carried out to the waveform of the voltage signal
And calculate each voltage harmonic data Uhi, pass throughHarmonic voltage content is calculated, further according toVoltage total harmonic distortion is calculated, judges whether the voltage total harmonic distortion transfinites and record the voltage
The total harmonic distortion overtime, according toMeter
Calculate voltage total harmonic distortion qualification rate, wherein UiFor the fundamental wave of the voltage signal, the voltage total harmonic distortion qualification rate is used for table
Levy the public electric wire net voltage harmonic index.
Calculate the voltage dip and refer to calibration method with short interruptions and be：For each phase voltage signal, respectively with half cycle
Ripple and the root-mean-square value that a cycle is voltage signal described in periodic refresh, obtain half cycles rms voltage Urms(1/2)(k1) and
Wave voltage root-mean-square value U weeklyrms(1)(k2), as a phase or the half cycles rms voltage U of ployphase voltages signalrms(1/2)
(k1) or weekly wave voltage root-mean-square value Urms(1)(k2) when less than the temporary drop threshold value set, voltage dip starts, when all phases electricity
Press the half cycles rms voltage U of signalrms(1/2)(k1) or weekly wave voltage root-mean-square value Urms(1)(k2) it is equal to or higher than institute
When stating temporarily drop threshold value and hysteresis voltage sum, voltage dip terminates, and number of times and temporary drawdown degree temporarily drop in recording voltage accordingly, with institute
Voltage dip number of times and temporary drawdown degree is stated to characterize the voltage dip and short interruptions index.
The method for calculating the power system frequency Deviation Indices is：Calculate the frequency of the voltage signal and judge described
Frequency whether in acceptability limit, and count the voltage signal frequency exceed the acceptability limit the frequency overtime,
According toFrequency qualification rate is calculated, the frequency qualification rate is used
In the sign power system frequency Deviation Indices.
It is preferred that, the signal conditioning circuit includes the voltage transformer, voltage conversion circuit, filtered electrical being sequentially connected
Road, voltage zero-cross comparison circuit；
The voltage measurement unit includes A/D converter；
The main control unit includes arm processor and its peripheral circuit；
The data communication units are power line carrier data communication units；
The data storage cell includes FLASH memory.
It is preferred that, the main control unit is also associated with data output display unit.
Because above-mentioned technical proposal is used, the present invention has following advantages compared with prior art：The voltage matter of the present invention
Figureofmerit monitoring device can carry out comprehensive monitoring to every quality of voltage index in transformer station, so as to be powered electricity for transformer station
The problem of pressure index is present provides effective information, is administered for electricity quality evaluation and provides quantitative basis.
Brief description of the drawings
Accompanying drawing 1 is the theory diagram of the quality of voltage Monitoring Indexes device of the present invention.
Embodiment
The invention will be further described for shown embodiment below in conjunction with the accompanying drawings.
Embodiment one：As shown in Figure 1, it is a kind of to be connected with the transformer secondary side bus of transformer station and be used to monitor change
The quality of voltage Monitoring Indexes device of the voltage signal quality of depressor secondary side, including signal conditioning circuit, voltage measurement unit,
Main control unit, data communication units, data storage cell and data output display unit.
Signal conditioning circuit is connected with transformer secondary side bus, and it in real time adopts the voltage signal of Circuit Fault on Secondary Transformer
Sample is transformed to the analog signalses that voltage measurement unit can be handled.The signal conditioning circuit includes the accuracy class being sequentially connected
For 0.1 grade of voltage transformer, voltage conversion circuit, filter circuit, voltage zero-cross comparison circuit.
Voltage measurement unit is connected with signal conditioning circuit, and the analog signalses that it exports signal conditioning circuit are changed
The digital quantity signal that can be handled for main control unit.Voltage measurement unit includes technical grade 14 A/D converters of high accuracy.
Main control unit is connected with voltage measurement unit, and it is divided in real time based on the digital quantity signal that voltage measurement unit is exported
Not Ji Suan voltage signal a series of indexs, including：Voltage deviation index, voltage fluctuation and flicker index, three-phase voltage are uneven
Weigh index, public electric wire net harmonic wave index, voltage dip and short interruptions index, power system frequency Deviation Indices.Main control unit
Can also output control data communication units control signal.Main control unit includes arm processor (or MCU, CPU etc.) and its outer
Enclose circuit.
Data communication units are connected with main control unit, and integrated by communication network and transformer station's electricity and the quality of power supply
Change management system to be connected.Data communication units are realized a series of indexs transmission of voltage signal under control of the control signal
To transformer station's electricity and quality of power supply Integrated Management.Data communication units use power line carrier data communication units.
Data storage cell is connected with main control unit and stores a series of indexs of voltage signal, and it is deposited including FLASH
Reservoir.
Data output display unit is connected with main control unit, so as to export and/or show that the one of voltage signal is
Row index, it can be made up of data outputting unit and data display unit respectively.
The quality of voltage Monitoring Indexes device can pass through network insertion to transformer station's electricity and the integrated pipe of the quality of power supply
Reason system, realizes the upload of supply voltage achievement data.
Above-mentioned quality of voltage Monitoring Indexes device includes following job step：
(1) initialize：Hardware initialization, including arm processor and its real-time clock module, A/D are carried out first after upper electricity
The initialization of converter, FLASH memory etc.；
(2) data acquisition：Start voltage sample timer on the Measurement channel that the present apparatus is accessed by voltage transformer, from
And the voltage signal of Circuit Fault on Secondary Transformer is sampled by signal conditioning circuit, A/D converter output voltage sampled value, warp
Main control unit is sent into after voltage measurement unit conversion；
(3) data are calculated：The calculating analysis of some row indexs, the knot drawn are carried out to voltage signal in main control unit
Fruit is shown by data output display unit, transformer station's electricity is uploaded to by data communication units and the quality of power supply is integrated
Change in management system, stored by data storage cell.
In main control unit, to voltage deviation index, voltage fluctuation and flicker index, imbalance of three-phase voltage index, public affairs
Mains by harmonics index, voltage dip and short interruptions index, the calculation and analysis methods of power system frequency Deviation Indices are as follows altogether：
1st, voltage deviation index
Voltage deviation index is characterized with rate of qualified voltage.
In the interrupt service routine of sampling, grid cycle can be calculated according to adjacent double sampling value, and then obtain electricity
Net frequency, then sets the timing cycle of sample clock generator, to control synchronized sampling according to grid cycle.Whenever MCU is obtained
To a new sampled data, primary voltage qualification rate calculation procedure is carried out, the qualified situation of current voltage is judged.
Rate of qualified voltage calculation procedure is performed after sampling obtains magnitude of voltage, its process is as follows：
A, abnormity removing：Magnitude of voltage and the recording voltage monitoring time of the voltage signal of Circuit Fault on Secondary Transformer are monitored, will be different
Normal magnitude of voltage is rejected, that is, is rejected the dead voltage value beyond rated voltage Un (1+22%) scope and obtained effective voltage value and enter
Row storage；
B, statistic unit are calculated：Using 1min as a statistic unit, the average value U of effective voltage value in 1min is taken1min,
It is used as the instant actual motion voltage in point being monitored；
C, rate of qualified voltage are calculated：Judge whether magnitude of voltage exceedes allowed limit value, the limit value allowed includes the upper limit
Value and lower limit, higher limit are Un (1+7%), and lower limit is Un (1-10%), and Un is rated voltage, and the voltage overtime includes
The super upper limit time of voltage and voltage super lower limit time, work as U1minThe super upper limit of magnitude of voltage, works as U during ＞ Un (1+7%)1min＜ Un (1-
10%) magnitude of voltage super lower limit when.The voltage overtime that magnitude of voltage exceedes allowed limit value is counted, according to
I.e.
Calculating voltage transfinites rate.
Then further according to
Rate of qualified voltage=1- voltages transfinite rate
Calculate rate of qualified voltage.
Or basis can be showed
Rate of qualified voltage=1- (Over High-Limit Voltage rate+voltage gets over lower limit rate)
Calculated.
2nd, voltage fluctuation and flicker index
Voltage fluctuation and flicker index is characterized with flickering qualification rate.
A, first pass through sampling and calculate the short time voltage flicker index P of voltage signalstj, i.e., by sampling to voltage wave
Dynamic component is demodulated, and is obtained and the linear voltage of voltage pulsation, (10min) is counted within the observation period, by CPF
Curve obtains Short Term Flicker value, Pstj, j represents the numbering of short time voltage flicker index；
B, further according to multiple short time voltage flicker indexs calculate long-time voltage flicker index
(every two hours calculating once).
C, judge whether long-time voltage flicker index is exceeded, that is, judges whether Plt＞ 1, and record long-time voltage flicker
Index PltThe exceeded flickering overtime.When flickering qualification rate is accumulative operation of the actual motion voltage in flickering acceptability limit
Between with corresponding device total run time very, i.e. basis
Calculate flickering qualification rate.
3rd, imbalance of three-phase voltage index
Imbalance of three-phase voltage index is characterized with imbalance of three-phase voltage rate qualification rate.
In three-phase system, by measuring the amplitude and phase of three-phase voltage, using symmetrical component method, three-phase voltage is obtained
Positive-sequence component, negative sequence component and zero-sequence component, and then obtain positive-sequence component root-mean-square valve U1(unit is volt), negative sequence component side
Equal root U2(unit is volt), zero-sequence component root-mean-square valve U0(unit is volt), further according to
Imbalance of three-phase voltage rate is calculated, and judges whether imbalance of three-phase voltage rate transfinites accordingly, record three-phase voltage is uneven
The total run time of coupling apparatus after the weighing apparatus rate overtime, according to
Calculate imbalance of three-phase voltage rate qualification rate.
4th, public electric wire net voltage harmonic index
Public electric wire net voltage harmonic index is characterized with voltage total harmonic distortion qualification rate.
FFT decomposition is carried out to the waveform of voltage signal and each voltage harmonic data U of 0-50 times is calculatedhi, i=1-
50, then according to
Calculate harmonic voltage content Uh, further according to
Calculate voltage total harmonic distortion THDu, wherein UiFor the fundamental wave of voltage signal.
Judge whether voltage total harmonic distortion transfinites and the recording voltage total harmonic distortion overtime, according to
Calculate voltage total harmonic distortion qualification rate.
5th, voltage dip and short interruptions index
Voltage dip is characterized with short interruptions index with voltage dip number of times and temporary drawdown degree.Obtain voltage sample value
Afterwards, determine whether that voltage dip occurs and calculates temporarily drop characteristic quantity, for each phase voltage signal, its deterministic process is as follows：
Using half cycles as the root-mean-square value of cycle (calculation window) refresh voltage signal, half cycles rms voltage is obtained
Urms(1/2)(k1)：
In formula：
The sampling number of N --- each cycle；
U (i) --- the instantaneous value for the voltage signal that ith sampling is obtained；
T --- calculate start time；
K1 --- the calculation window sequence number by the cycle of half cycles, k1=1,2,3 ...；Then the of half cycles rms voltage
One value is in first cycle, i.e., to be obtained from sampled point 1 to N, second value of half cycles rms voltage be
Sampled point (N/2)+1 is obtained to (N/2)+N, by that analogy.
Using a cycle as the root-mean-square value of cycle (calculation window) refresh voltage signal, wave voltage root-mean-square value weekly is obtained
Urms(1)(k2)：
In formula：
The sampling number of N --- each cycle；
U (i) --- the instantaneous value for the voltage signal that ith sampling is obtained；
T --- calculate start time；
K2 --- the calculation window sequence number by the cycle of a cycle, k2=1,2,3 ...；Then the of wave voltage root-mean-square value weekly
One value is in first cycle, i.e., to be obtained from sampled point 1 to N, weekly the second of wave voltage root-mean-square value value be
What sampled point N+1 to 2N was obtained, by that analogy.
Default temporarily drop threshold value, it is temporary that the general definition according to voltage dip, which is set to 0.9p.u. (the 90% of rated voltage),
Threshold value drops.As a phase or the half cycles rms voltage U of ployphase voltages signalrms(1/2)(k1) or weekly wave voltage root-mean-square value
Urms(1)(k2) when less than the temporary drop threshold value set, voltage dip starts, when the half cycle wave voltage root mean square of all phase voltage signals
Value Urms(1/2)(k1) or weekly wave voltage root-mean-square value Urms(1)(k2) when being equal to or higher than temporarily drop threshold value and hysteresis voltage sum,
Voltage dip terminates.So as to the process record voltage dip number of times and temporary drawdown degree according to voltage dip.
6th, power system frequency Deviation Indices
Power system frequency Deviation Indices are characterized with frequency qualification rate.
Calculate power system frequency Deviation Indices method be：Start frequency measurement capturing function and sample clock generator, in capture
Interrupt service routine in, can calculate grid cycle according to the adjacent value of capture twice, and then calculate the frequency of voltage signal, with
1s takes the average value of frequency pretreatment values in 1s as a statistic unit, is used as the instant actual motion frequency in point being monitored
f。
Whether determination frequency f is in the ＜ f ＜ 50.2 of acceptability limit 49.8.The frequency for counting voltage signal exceeds acceptability limit
The frequency overtime (unit is s), according to
Calculate frequency qualification rate.
Carried out data transmission by the indices that the above method is calculated by communication network and be uploaded to transformer station's electricity
Amount and quality of power supply Integrated Management, the data transfer of supply voltage index is realized by network communication.
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art
Scholar can understand present disclosure and implement according to this, and it is not intended to limit the scope of the present invention.It is all according to the present invention
The equivalent change or modification that Spirit Essence is made, should all be included within the scope of the present invention.
Claims (10)
1. a kind of quality of voltage Monitoring Indexes device, it is connected with the transformer secondary side bus of transformer station and is used to monitoring described
The quality of the voltage signal of Circuit Fault on Secondary Transformer, it is characterised in that：The quality of voltage Monitoring Indexes device includes signal condition
Circuit, voltage measurement unit, main control unit, data communication units and data storage cell；
The signal conditioning circuit is connected with the transformer secondary side bus, and the signal conditioning circuit becomes described in real time
The voltage signal sampling of depressor secondary side is transformed to the analog signalses that the voltage measurement unit can be handled；
The voltage measurement unit is connected with the signal conditioning circuit, and the voltage measurement unit is electric by the signal condition
The analog signalses of road output are converted to the digital quantity signal that the main control unit can be handled；
The main control unit is connected with the voltage measurement unit, and the main control unit is exported based on the voltage measurement unit
Digital quantity signal calculate a series of indexs of the voltage signal respectively in real time, the main control unit can also output control institute
State the control signal of data communication units；
The data communication units are connected with the main control unit, and pass through communication network and transformer station's electricity and the quality of power supply
Integrated Management is connected, and the data communication units are realized the voltage signal under the control of said control signal
A series of indexs transmit to transformer station's electricity and quality of power supply Integrated Management；
The data storage cell is connected with the main control unit and stores a series of indexs of the voltage signal；
It is uneven that a series of indexs of the voltage signal include voltage deviation index, voltage fluctuation and flicker index, three-phase voltage
Weigh index, public electric wire net harmonic wave index, voltage dip and short interruptions index, power system frequency Deviation Indices.
2. quality of voltage Monitoring Indexes device according to claim 1, it is characterised in that：Calculate the voltage deviation index
Method be：Magnitude of voltage and the recording voltage monitoring time of the voltage signal of the Circuit Fault on Secondary Transformer are monitored, the electricity is judged
Whether pressure value exceedes allowed limit value and counts the voltage overtime that the magnitude of voltage exceedes allowed limit value, Transfinited rate further according to rate of qualified voltage=1- voltages
Rate of qualified voltage is calculated, the rate of qualified voltage is used to characterize the voltage deviation index.
3. quality of voltage Monitoring Indexes device according to claim 2, it is characterised in that：First reject Un (1 ± 22%) model
Carry out statistics calculating after dead voltage value beyond enclosing again, the allowed limit value includes higher limit and lower limit, it is described on
Limit value is Un (1+7%), and the lower limit is Un (1-10%), and wherein Un is rated voltage, and the voltage overtime includes
The super upper limit time of voltage and voltage super lower limit time,
4. quality of voltage Monitoring Indexes device according to claim 1, it is characterised in that：Calculate the voltage pulsation
Referring to calibration method with flickering is：The short time voltage flicker index that sampling calculates the voltage signal is first passed through, then
Long-time voltage flicker index is calculated according to multiple short time voltage flicker indexs, the long-time electricity is judged
Whether pressure flickering index is exceeded and records the flickering overtime of the long-time voltage flicker index exceeding standard, according toThe flickering qualification rate is used to characterize institute
State voltage fluctuation and flicker index.
5. quality of voltage Monitoring Indexes device according to claim 1, it is characterised in that：Calculate the three-phase electricity
Pressure imbalance refers to calibration method and is：Amplitude and phase calculation positive-sequence component, negative sequence component based on three-phase voltage and
Zero-sequence component, further according toThe imbalance of three-phase voltage rate is calculated, the three-phase voltage is judged
Whether unbalance factor transfinites and records the imbalance of three-phase voltage rate overtime, according to It is described
Imbalance of three-phase voltage rate qualification rate is used to characterize the imbalance of three-phase voltage index, wherein, U1For the positive sequence of three-phase voltage
Component root-mean-square valve, U2For the negative sequence component root-mean-square valve of three-phase voltage, U0For the zero-sequence component root-mean-square valve of three-phase voltage.
6. quality of voltage Monitoring Indexes device according to claim 1, it is characterised in that：Calculate the public electric wire net voltage
Harmonic wave refers to calibration method：FFT decomposition is carried out to the waveform of the voltage signal and each voltage harmonic data U is calculatedhi, lead to
CrossHarmonic voltage content is calculated, further according to Sentence
Whether the voltage total harmonic distortion of breaking transfinites and records the voltage total harmonic distortion overtime, according toWherein
UiFor the fundamental wave of the voltage signal, the voltage total harmonic distortion qualification rate refers to for characterizing the public electric wire net voltage harmonic
Mark.
7. quality of voltage Monitoring Indexes device according to claim 1, it is characterised in that：Calculate the voltage dip with it is short
When interrupt and refer to calibration method and be：For each phase voltage signal, the voltage described in periodic refresh using half cycles and a cycle respectively
The root-mean-square value of signal, obtains half cycles rms voltage Urms(1/2)(k1) and weekly wave voltage root-mean-square value Urms(1)(k2),
As a phase or the half cycles rms voltage U of ployphase voltages signalrms(1/2)(k1) or weekly wave voltage root-mean-square value Urms(1)
(k2) when less than the temporary drop threshold value set, voltage dip starts, when the half cycles rms voltage of all phase voltage signals
Urms(1/2)(k1) or weekly wave voltage root-mean-square value Urms(1)(k2) it is equal to or higher than the temporary drop threshold value and hysteresis voltage sum
When, voltage dip terminates, and number of times and temporary drawdown degree temporarily drop in recording voltage accordingly, with the voltage dip number of times and temporary drawdown
Spend to characterize the voltage dip and short interruptions index.
8. quality of voltage Monitoring Indexes device according to claim 1, it is characterised in that：Calculate the power system
Frequency departure refers to calibration method：Calculate the frequency of the voltage signal and judge the frequency whether in acceptability limit
It is interior, and the frequency overtime that the frequency of the voltage signal exceeds the acceptability limit is counted, according toThe frequency qualification rate is used for table
Levy the power system frequency Deviation Indices.
9. quality of voltage Monitoring Indexes device according to claim 1, it is characterised in that：The signal conditioning circuit includes
Voltage transformer, voltage conversion circuit, filter circuit, the voltage zero-cross comparison circuit being sequentially connected；
The voltage measurement unit includes A/D converter；
The main control unit includes arm processor and its peripheral circuit；
The data communication units are power line carrier data communication units；
The data storage cell includes FLASH memory.
10. the quality of voltage Monitoring Indexes device according to claim 1 or 9, it is characterised in that：The main control unit also connects
It is connected to data output display unit.
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| CN112782503A (en) * | 2020-12-24 | 2021-05-11 | 深圳供电局有限公司 | Power quality evaluation method and device, control equipment and storage medium |
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| CN107612146A (en) * | 2017-10-30 | 2018-01-19 | 海南电网有限责任公司 | A kind of main transformer power factor and busbar voltage online data monitoring device |
| CN108490248A (en) * | 2018-03-13 | 2018-09-04 | 浙江海洋大学 | A kind of voltage monitoring and voltage protection |
| CN108595120A (en) * | 2018-04-11 | 2018-09-28 | 广东电网有限责任公司 | A kind of scada near-realtime datas storage method and system |
| CN110208718A (en) * | 2019-05-24 | 2019-09-06 | 广州耐奇电气科技有限公司 | Power quality test method, system, readable storage medium storing program for executing and computer equipment |
| CN110208718B (en) * | 2019-05-24 | 2022-02-22 | 广州耐奇电气科技有限公司 | Power supply quality testing method and system, readable storage medium and computer equipment |
| CN110554231A (en) * | 2019-07-24 | 2019-12-10 | 深圳供电局有限公司 | Voltage monitoring method, voltage monitoring device, computer equipment and storage medium |
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| CN112782503A (en) * | 2020-12-24 | 2021-05-11 | 深圳供电局有限公司 | Power quality evaluation method and device, control equipment and storage medium |
| CN112994251A (en) * | 2021-04-21 | 2021-06-18 | 北京每日优鲜电子商务有限公司 | Electric quantity early warning method and device, electronic equipment and computer readable medium |
| CN112994251B (en) * | 2021-04-21 | 2021-08-31 | 北京每日优鲜电子商务有限公司 | Electric quantity early warning method and device, electronic equipment and computer readable medium |
| CN113034059A (en) * | 2021-05-19 | 2021-06-25 | 北京国电通网络技术有限公司 | Abnormal power information positioning method and device, electronic equipment and computer medium |
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Application publication date: 20170929 |