CN107748286A - A kind of recognition methods of transformer station's surge interfering signal and device - Google Patents
A kind of recognition methods of transformer station's surge interfering signal and device Download PDFInfo
- Publication number
- CN107748286A CN107748286A CN201710780094.2A CN201710780094A CN107748286A CN 107748286 A CN107748286 A CN 107748286A CN 201710780094 A CN201710780094 A CN 201710780094A CN 107748286 A CN107748286 A CN 107748286A
- Authority
- CN
- China
- Prior art keywords
- cycle
- current
- data
- surge
- network message
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R13/00—Arrangements for displaying electric variables or waveforms
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2218/00—Aspects of pattern recognition specially adapted for signal processing
- G06F2218/08—Feature extraction
- G06F2218/10—Feature extraction by analysing the shape of a waveform, e.g. extracting parameters relating to peaks
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Locating Faults (AREA)
Abstract
The present invention relates to a kind of recognition methods of transformer station's surge interfering signal and device, recognition methods to include：Gather substation network message real time data；According to substation network message previous cycle evidence, current cycle and latter cycle data, four sample point data X are obtained successivelyk‑1、Xk、Xk‑NAnd Xk+NIf XkAnd Xk‑1Between difference absolute value and XkAnd Xk‑NBetween the absolute value of difference be satisfied by the threshold value of setting, or XkAnd Xk‑1Between difference absolute value and XkAnd Xk+NBetween the absolute value of difference be satisfied by the threshold value of setting, then be determined as that surge interference occurs for current cycle kth point.The present invention is by judging whether the sample point data of the previous cycle evidence of substation network message real time data, current cycle and latter cycle data meets the condition of setting, the surge interfering signal in voltage waveform or current waveform can be identified exactly, subsequently to filter out the surge interfering signal, fault wave recording device is avoided to cause failure wave-recording error starting to provide reliable foundation because of surge interfering signal.
Description
Technical field
The present invention relates to a kind of recognition methods of transformer station's surge interfering signal and device, belongs to electric power project engineering neck
Domain.
Background technology
Surge is just above the transient overvoltage of normal voltage, and the short time for referring generally to occur in power network is as " wave "
High current caused by high voltage.In essence, surge is exactly that a kind of violent pulse in moment occurs.The generation of surge voltage
Reason has two：One is thunder and lightning, and another is that large-scale load on power network is switched on or switched off (switching for including compensating electric capacity)
It is caused.Surge waveform can be divided into high frequency transient segment pulse and low cut part, wherein high frequency transient segment pulse width
Value changes are big, and the influence to real-time data analysis is very big, but the duration is short, and most of is Millisecond.
In the case of transformer station's real work, surge interference can influence fault wave recording device real time data sampling, produce
Data skew, a series of electric parameters such as calculating amplitude, phase angle, frequency are made to produce deviation, so as to cause the error starting of failure wave-recording.
Therefore, in order to avoid failure wave-recording error starting, it is necessary to identify exactly and filter out surge interfering signal, ensure voltage, electric current
The accurate recording of sampling.
The content of the invention
It is an object of the invention to provide a kind of recognition methods of transformer station's surge interfering signal and device, for solve how
The problem of whether current cycle of sampled signal occurs surge interference accurately identified.
In order to solve the above technical problems, the invention provides a kind of recognition methods of transformer station's surge interfering signal, step
It is as follows：
Gather substation network message real time data；
According to substation network message previous cycle evidence, current cycle and latter cycle data, four are obtained successively
Sample point data Xk-1、Xk、Xk-NAnd Xk+NIf meeting any one following condition, it is determined as that current cycle kth point occurs
Surge disturbs：
Condition a：Δ f (k) ＞ Δs fsetAnd Δ f (k-N) ＞ Δs fset
Condition b：Δ f (k) ＞ Δs fsetAnd Δ f (k+N) ＞ Δs fset
Wherein, Δ f (k)=| Xk-Xk-1|, Δ f (k-N)=| Xk-Xk-N|, Δ f (k+N)=| Xk-Xk+N|, XkFor current week
K-th of sampled point of ripple, Xk-1For current -1 sampled point of cycle kth, Xk-NFor previous k-th of sampled point of cycle, Xk+NFor latter week
K-th of sampled point of ripple, N are per cycle sampling number, Δ fset=2 (A+5Bset) * sin (π/N), A be present day analog amount passage two
Secondary rated voltage or rated current, BsetIt is mutated for present day analog amount passage and starts definite value.
Further, if substation network message data is voltage data, A is the secondary specified electricity of present day analog amount passage
Pressure；If substation network message data is current data, A is the secondary rated current of present day analog amount passage.
Present invention also offers a kind of identification device of transformer station's surge interfering signal, including identification device processor, institute
State the instruction that following method is realized in the processing of identification device processor：
Gather substation network message real time data；
According to substation network message previous cycle evidence, current cycle and latter cycle data, four are obtained successively
Sample point data Xk-1、Xk、Xk-NAnd Xk+NIf meeting any one following condition, it is determined as that current cycle kth point occurs
Surge disturbs：
Condition a：Δ f (k) ＞ Δs fsetAnd Δ f (k-N) ＞ Δs fset
Condition b：Δ f (k) ＞ Δs fsetAnd Δ f (k+N) ＞ Δs fset
Wherein, Δ f (k)=| Xk-Xk-1|, Δ f (k-N)=| Xk-Xk-N|, Δ f (k+N)=| Xk-Xk+N|, XkFor current week
K-th of sampled point of ripple, Xk-1For current -1 sampled point of cycle kth, Xk-NFor previous k-th of sampled point of cycle, Xk+NFor latter week
K-th of sampled point of ripple, N are per cycle sampling number, Δ fset=2 (A+5Bset) * sin (π/N), A be present day analog amount passage two
Secondary rated voltage or rated current, BsetIt is mutated for present day analog amount passage and starts definite value.
Further, if substation network message data is voltage data, A is the secondary specified electricity of present day analog amount passage
Pressure；If substation network message data is current data, A is the secondary rated current of present day analog amount passage.
The beneficial effects of the invention are as follows：By judging the current cycle of substation network message real time data and previous cycle
According to or the sample point data of current cycle and latter cycle data whether meet the condition of setting, electricity can be identified exactly
Surge interfering signal in corrugating or current waveform, subsequently to filter out the surge interfering signal, avoid fault wave recording device because
Surge interfering signal causes failure wave-recording error starting to provide reliable foundation.
Brief description of the drawings
Fig. 1 is the flow chart of Wave record method of the present invention based on transformer station's antisurge interference；
Fig. 2 is the crude sampling waveform of analog signal of the present invention；
Fig. 3 is the flow chart of the recognition methods of transformer station's surge interfering signal of the present invention；
Fig. 4 is the crude sampling waveform of surge point of the present invention partial enlargement；
Fig. 5 is that the filtered sample waveform partial enlarged drawing of linear interpolation is passed through in surge point of the present invention.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with accompanying drawing and specific implementation
The present invention will be described in further detail for example.
In the case of transformer station's real work, surge interference can influence real-time sampling data and be distorted, and record failure
Wave apparatus calculates a series of electric parameters such as amplitude, phase angle, frequency and produces deviation, so as to cause the error starting of recording.Pin of the present invention
The characteristics of to surge waveform, there is provided a kind of recognition methods of transformer station's surge interfering signal, the recognition methods is applied into change
In the Wave record method in power station, a kind of Wave record method based on transformer station's antisurge interference, the logic of recording side's method have been obtained
Schematic diagram is as shown in figure 1, specifically include following steps：
(1) substation network message real time data is gathered, judges whether current cycle occurs surge interference.
Specifically, collection substation network message real time data, sample frequency 4000Hz, i.e., per cycle sampling number N
=80.In the present embodiment, the crude sampling waveform of analog signal is as shown in Figure 2.The real time data collected write-in is real-time
Data buffer zone, real time data buffering area is an array round-robin queue, including at least previous cycle sampled data buffering area
DSampleDataBuf1 [N], current cycle sampled data buffering area dSampleDataBuf [N] and latter cycle sampled data
Buffering area dSampleDataBuf2 [N], real time data buffering area array round-robin queue logical construction are as shown in table 1：
Table 1
According to the substation network message real time data collected, the recognition methods of transformer station's surge interfering signal of the present invention
Flow chart as shown in figure 3, step is as follows：
1) according to the previous cycle of data buffer zone substation network message according to, current cycle and latter cycle data,
Four sample point data X are obtained successivelyk-1、Xk、Xk-NAnd Xk+N, wherein, XkFor current k-th of sampled point of cycle, Xk-1For current week
- 1 sampled point of ripple kth, Xk-NFor upper k-th of sampled point of a cycle, Xk+NFor next k-th of sampled point of cycle, N is to be adopted per cycle
Number of samples.
2) the poor absolute value between the sampled value of above-mentioned two sampled point is obtained respectively：
Δ f (k)=| Xk-Xk-1|
Δ f (k-N)=| Xk-Xk-N|
Δ f (k+N)=| Xk-Xk+N|
If 3) meet any one following condition, it is determined as that surge interference occurs for current cycle kth point：
Condition a：Δ f (k) ＞ Δs fsetAnd Δ f (k-N) ＞ Δs fset
Condition b：Δ f (k) ＞ Δs fsetAnd Δ f (k+N) ＞ Δs fset
Wherein, Δ fsetDefinition be：Assuming that a preferable sine wave signal is Asinwt, it is per cycle sampling number
N, the difference of two neighboring sampled point are：
As cos (π * (2k+1)/N)=1, above formula takes maximum, takes Δ fset=2 (A+5Bset) * sin (π/N), for
Voltage sample waveform, A are the secondary rated voltage of present day analog amount passage；For current sample waveform, A is present day analog amount passage
Secondary rated current；BsetIt is mutated for present day analog amount passage and starts definite value.
In the present embodiment, Fig. 4 gives the partial enlarged drawing that surge interference occurs for current cycle kth point.
(2) if surge interference occurs for current cycle kth point, now it is divided into two kinds of situations：
If sampled value meets condition a, the previous cycle kth -1 that surge interference occurs is obtained, real-time sampling at k and k+1 points
Value, linear interpolation filtering is carried out to current cycle using real-time sampling value at previous cycle kth -1, k and k+1 points and is calculated, and replaced
Change the data of surge interference high frequency transient segment pulse.
If sampled value meets condition b, the latter cycle kth -1 that surge interference occurs is obtained, real-time sampling at k and k+1 points
Value, linear interpolation filtering is carried out to current cycle using real-time sampling value at latter cycle kth -1, k and k+1 points and is calculated, and replaced
Change the data of surge interference high frequency transient segment pulse.
It is the basic reason of recording malfunction, it is necessary to be filtered place because high frequency transient segment pulse meets decision condition
Reason；Low cut part is unsatisfactory for decision condition, calculates analyzing influence very little to data, will not cause recording malfunction.Therefore, such as
Surge interference occurs for the current cycle kth point of fruit, creates ephemeral data buffering area, using surge occur it is front/rear (previous cycle or
Latter cycle) kth -1, real-time sampling value carries out linear interpolation calculating to current cycle at k and k+1 points, and replace surge and do
The data of high frequency transient segment pulse are disturbed, write ephemeral data buffering area, surge point is adopted by linear interpolation is filtered
Sample waveform partial enlarged drawing is as shown in Figure 5.Wherein, if meeting condition a, current cycle is carried out using the sampled value of previous cycle
Linear interpolation filtering calculates, and calculation formula is：
Wherein, g (k) is the linear interpolation of current k-th point of cycle, and g (k+1-N) is adopting for previous+1 point of cycle kth
Sample value, g (k-N) are the sampled value of previous k-th point of cycle, and g (k-1-N) is the sampled value of previous -1 point of cycle kth.
If meeting condition b, linear interpolation filtering is carried out to current cycle using the sampled value of latter cycle and calculated, is calculated public
Formula is：
Wherein, g (k) is the linear interpolation of current k-th point of cycle, and g (k+1+N) is adopting for latter+1 point of cycle kth
Sample value, g (k+N) are the sampled value of latter k-th point of cycle, and g (k-1+N) is the sampled value of latter -1 point of cycle kth.
(3) be according to the sampled data after replacement ephemeral data buffering area sampled data, calculate the amplitude of current cycle,
And compared with the amplitude of a upper cycle, judge whether to meet that passage is mutated entry condition, be now divided into two kinds of situations：
Situation 1：If meeting, passage is mutated entry condition, does not substitute current real-time data buffering area, directly initiates passage
It is mutated recording；
Situation 2：If being unsatisfactory for passage mutation entry condition, substituting current real-time data with ephemeral data buffer data delays
Area's data are rushed, continues related electric parameter and calculates and the calculating of other failure wave-recording criterions.
Passage is mutated entry condition：
|DCurrent cycle-DPrevious cycle| ＞ Δs D
Wherein, DCurrent cycleFor current all wave amplitudes, DPrevious cycleFor the last week wave amplitude, Δ D starts definite value for mutation, typically taken
Δ D is the 5% of secondary rated value, can be set according to on-site actual situations.
Related electric parameter calculate include to amplitude, phase angle, DC component, harmonic wave (second harmonic of alternating voltage, it is humorous three times
Ripple, quintuple harmonics, the seventh harmonic), frequency, order components (positive sequence, negative phase-sequence, zero sequence), power (active, idle, power factor)
Calculate, transformer longitudinal calculates and generator indulges difference calculating etc.；Failure wave-recording criterion includes analog quantity mutation startup, analog quantity
More the upper limit starts, analog quantity more lower limit starts, current oscillation starts, the frequency more upper limit starts, lower-frequency limit starts, positive sequence is dashed forward
Become, positive sequence get over the upper limit start, positive sequence lower limit start, negative phase-sequence mutation, negative phase-sequence get over the upper limit start, negative phase-sequence lower limit start, zero sequence mutation,
Zero sequence gets over the upper limit starts, zero sequence lower limit starts, and transformer is related to be started, and generator correlation starts etc..
Related electric parameter and failure wave-recording criterion needed for recording is very more, and above-mentioned include is only some typical phases
Powered-down parameter and failure wave-recording criterion.All electric parameters are all based on what real-time sampling data was calculated, so must be to reality
When sampling in surge interference data filtered out, and recalculate electric parameter, otherwise can cause the mistake of above-mentioned failure wave-recording criterion
Start.
It should be noted that surge identification and passage mutation judge mainly to prepare to recalculate electric parameter, that is, work as
Preceding cycle has surge, and surging signal is first filtered out in temporary buffer, judges whether that trigger port mutation starts, if do not touched
Send out passage mutation to start, it is necessary to the data duplication in temporary buffer into real time data buffer area, recalculate current week
Ripple correlation electric parameter, it so will not just cause the error starting of above-mentioned failure wave-recording criterion；Surge letter is filtered out in temporary buffer
After number, if present day analog amount passage is mutated really, analog quantity channel mutation recording is directly initiated, it is not necessary to enter line number
According to replacement, it is not required that sentence other criterions again.This is due to that the operation principle of wave recording device is：As long as there is a recording criterion
Meet condition, recording will be started.On the other hand, in a recorded wave file, it is also possible to include various faults.
According to above-mentioned two situations, real time data buffering area is updated, performs real time data sampling next time.Due to the present invention
It can effectively identify and filter out surge interference, the reliable and stable startup recording of fault wave recording device can be ensured.
Present invention also offers a kind of identification device of transformer station's surge interfering signal, including identification device processor, institute
State the instruction that following method is realized in the processing of identification device processor：
Gather substation network message real time data；
According to substation network message previous cycle evidence, current cycle and latter cycle data, four are obtained successively
Sample point data Xk-1、Xk、Xk-NAnd Xk+NIf meeting any one following condition, it is determined as that current cycle kth point occurs
Surge disturbs：
Condition a：Δ f (k) ＞ Δs fsetAnd Δ f (k-N) ＞ Δs fset
Condition b：Δ f (k) ＞ Δs fsetAnd Δ f (k+N) ＞ Δs fset
Wherein, Δ f (k)=| Xk-Xk-1|, Δ f (k-N)=| Xk-Xk-N|, Δ f (k+N)=| Xk-Xk+N|, XkFor current week
K-th of sampled point of ripple, Xk-1For current -1 sampled point of cycle kth, Xk-NFor previous k-th of sampled point of cycle, Xk+NFor latter week
K-th of sampled point of ripple, N are per cycle sampling number, Δ fset=2 (A+5Bset) * sin (π/N), A be present day analog amount passage two
Secondary rated voltage or rated current, BsetIt is mutated for present day analog amount passage and starts definite value.
The core of the identification device of transformer station's surge interfering signal is to realize above-mentioned transformer station's surge interfering signal
Recognition methods, due to above-mentioned recognition methods being described in detail, identification device is repeated no more herein.
Claims (4)
1. a kind of recognition methods of transformer station's surge interfering signal, it is characterised in that step is as follows：
Gather substation network message real time data；
According to substation network message previous cycle evidence, current cycle and latter cycle data, four samplings are obtained successively
Point data Xk-1、Xk、Xk-NAnd Xk+NIf meeting any one following condition, it is determined as that surge occurs for current cycle kth point
Interference：
Condition a：Δ f (k) ＞ Δs fsetAnd Δ f (k-N) ＞ Δs fset
Condition b：Δ f (k) ＞ Δs fsetAnd Δ f (k+N) ＞ Δs fset
Wherein, Δ f (k)=| Xk-Xk-1|, Δ f (k-N)=| Xk-Xk-N|, Δ f (k+N)=| Xk-Xk+N|, XkFor current cycle kth
Individual sampled point, Xk-1For current -1 sampled point of cycle kth, Xk-NFor previous k-th of sampled point of cycle, Xk+NFor latter cycle kth
Individual sampled point, N are per cycle sampling number, Δ fset=2 (A+5Bset) * sin (π/N), A be the secondary volume of present day analog amount passage
Determine voltage or rated current, BsetIt is mutated for present day analog amount passage and starts definite value.
2. the recognition methods of transformer station's surge interfering signal according to claim 1, it is characterised in that if substation network
Message data is voltage data, and A is the secondary rated voltage of present day analog amount passage；If substation network message data is electric current number
According to A is the secondary rated current of present day analog amount passage.
A kind of 3. identification device of transformer station's surge interfering signal, it is characterised in that including identification device processor, the identification
The instruction of following method is realized in de-vice processor processing：
Gather substation network message real time data；
According to substation network message previous cycle evidence, current cycle and latter cycle data, four samplings are obtained successively
Point data Xk-1、Xk、Xk-NAnd Xk+NIf meeting any one following condition, it is determined as that surge occurs for current cycle kth point
Interference：
Condition a：Δ f (k) ＞ Δs fsetAnd Δ f (k-N) ＞ Δs fset
Condition b：Δ f (k) ＞ Δs fsetAnd Δ f (k+N) ＞ Δs fset
Wherein, Δ f (k)=| Xk-Xk-1|, Δ f (k-N)=| Xk-Xk-N|, Δ f (k+N)=| Xk-Xk+N|, XkFor current cycle kth
Individual sampled point, Xk-1For current -1 sampled point of cycle kth, Xk-NFor previous k-th of sampled point of cycle, Xk+NFor latter cycle kth
Individual sampled point, N are per cycle sampling number, Δ fset=2 (A+5Bset) * sin (π/N), A be the secondary volume of present day analog amount passage
Determine voltage or rated current, BsetIt is mutated for present day analog amount passage and starts definite value.
4. the identification device of transformer station's surge interfering signal according to claim 3, it is characterised in that if substation network
Message data is voltage data, and A is the secondary rated voltage of present day analog amount passage；If substation network message data is electric current number
According to A is the secondary rated current of present day analog amount passage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710780094.2A CN107748286A (en) | 2017-09-01 | 2017-09-01 | A kind of recognition methods of transformer station's surge interfering signal and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710780094.2A CN107748286A (en) | 2017-09-01 | 2017-09-01 | A kind of recognition methods of transformer station's surge interfering signal and device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107748286A true CN107748286A (en) | 2018-03-02 |
Family
ID=61255687
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710780094.2A Pending CN107748286A (en) | 2017-09-01 | 2017-09-01 | A kind of recognition methods of transformer station's surge interfering signal and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107748286A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113128153A (en) * | 2021-04-20 | 2021-07-16 | 合肥工业大学 | Active frequency conversion fault recording method triggered by composite threshold in photovoltaic power station |
| CN113904957A (en) * | 2021-12-08 | 2022-01-07 | 深圳佑驾创新科技有限公司 | Sampling point testing method and system and main control equipment thereof |
| CN115032560A (en) * | 2022-08-11 | 2022-09-09 | 石家庄科林电气股份有限公司 | Fault recording starting method of power distribution terminal |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0862277A (en) * | 1994-08-19 | 1996-03-08 | Tokyo Electric Power Co Inc:The | Apparatus for locating fault point of transmission line |
| CN101673937A (en) * | 2009-08-13 | 2010-03-17 | 许继集团有限公司 | Surge interference identification method during differential protection and differential protection method |
| CN104391195A (en) * | 2014-11-20 | 2015-03-04 | 江苏省电力公司扬州供电公司 | Electromagnetic interference identifying and filtering method |
| CN105277829A (en) * | 2015-11-10 | 2016-01-27 | 国网天津市电力公司 | Linear-interpolation-based real-time identification method of abnormal sampling value |
-
2017
- 2017-09-01 CN CN201710780094.2A patent/CN107748286A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0862277A (en) * | 1994-08-19 | 1996-03-08 | Tokyo Electric Power Co Inc:The | Apparatus for locating fault point of transmission line |
| CN101673937A (en) * | 2009-08-13 | 2010-03-17 | 许继集团有限公司 | Surge interference identification method during differential protection and differential protection method |
| CN104391195A (en) * | 2014-11-20 | 2015-03-04 | 江苏省电力公司扬州供电公司 | Electromagnetic interference identifying and filtering method |
| CN105277829A (en) * | 2015-11-10 | 2016-01-27 | 国网天津市电力公司 | Linear-interpolation-based real-time identification method of abnormal sampling value |
Non-Patent Citations (1)
| Title |
|---|
| 刘伟、王毅: "电力录波数据中浪涌干扰的识别及滤除", 《电力系统自动化》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113128153A (en) * | 2021-04-20 | 2021-07-16 | 合肥工业大学 | Active frequency conversion fault recording method triggered by composite threshold in photovoltaic power station |
| CN113128153B (en) * | 2021-04-20 | 2022-08-30 | 合肥工业大学 | Active frequency conversion fault recording method triggered by composite threshold in photovoltaic power station |
| CN113904957A (en) * | 2021-12-08 | 2022-01-07 | 深圳佑驾创新科技有限公司 | Sampling point testing method and system and main control equipment thereof |
| CN115032560A (en) * | 2022-08-11 | 2022-09-09 | 石家庄科林电气股份有限公司 | Fault recording starting method of power distribution terminal |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107329040B (en) | A kind of power distribution automation main station system single-phase earth fault localization method based on transient state recorder data | |
| CN103499769B (en) | A kind of resonant earthed system self-adaption route selection method for single-phase ground fault | |
| CN107748286A (en) | A kind of recognition methods of transformer station's surge interfering signal and device | |
| CN107782992A (en) | A kind of Wave record method and device based on transformer station's antisurge interference | |
| CN101551433A (en) | Distribution network feed out circuit fault circuit selection method by using HHT detection technology | |
| Jóhannsson et al. | Wide-area assessment of aperiodic small signal rotor angle stability in real-time | |
| CN103701303A (en) | Switching power supply with testability function and testing method thereof | |
| CN108469561A (en) | A kind of intelligent substation Commissioning of Relay Protection method | |
| CN109975653A (en) | A kind of 10 KV distribution circuit fault distance measurements | |
| CN110687399A (en) | Method for judging waveform fault starting time of power distribution network fault indicator | |
| CN109088425A (en) | A kind of commutation failure prevention method based on ac bus voltage disturbance amount | |
| CN103207307B (en) | Test method of leakage current component of metal oxide arrester | |
| CN101192752B (en) | High-voltage arc grounding recognition method based on spectrum analysis | |
| CN103605028A (en) | PWM testing system based on single period multipoint sampling | |
| CN105866592A (en) | System and method for acquiring dynamic reactive power compensation response waveforms | |
| Shu et al. | MMC-HVDC line fault identification scheme based on single-ended transient voltage information entropy | |
| CN108629087A (en) | Disturbance event model building method, device and disturbance event recognition methods, device | |
| CN104866964A (en) | Method for processing flying spot data in intelligent transformer station | |
| CN104931848B (en) | A kind of line fault of electrical power system method of discrimination based on wide area measurement information | |
| CN110286268A (en) | Power waveform distortion appraisal procedure based on frequency fluctuation | |
| Li et al. | Automatic Expansion of Voltage Signals Using Empirical Mode Decomposition for Voltage Sag Detection | |
| CN102645603A (en) | Electric energy quality monitoring method | |
| Chen et al. | Power quality disturbance detection based on morphology singular entropy | |
| CN205786889U (en) | Dynamic passive compensation response wave shape acquisition system | |
| CN203572896U (en) | PWM test system based on single-period multipoint sampling |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180302 |