CN106451323B - It is a kind of solve intelligent substation difference combining unit between latency issue on-site calibrating method - Google Patents
It is a kind of solve intelligent substation difference combining unit between latency issue on-site calibrating method Download PDFInfo
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0061—Details of emergency protective circuit arrangements concerning transmission of signals
- H02H1/0069—Details of emergency protective circuit arrangements concerning transmission of signals by means of light or heat rays
Abstract
The present invention relates to a kind of on-site calibrating method of latency issue between solution intelligent substation difference combining unit, steps are as follows: the (1) size of the inconsistent time difference stream of analysis delay and the impact analysis to protection；(2) according to delay Analysis as a result, selection check method: 1. method of calibration when the different combining unit delay non-integral multiple cycles of difference；2. method of calibration when different combining unit delay difference integral multiple cycles.The inconsistent situation of delay of this method to each side combining unit classifies, respectively inquires into; the method of calibration of method of calibration and duplicate system retrofit protective device that new each side combining unit is delayed inconsistent is proposed under corresponding different situations on this basis, has the characteristics that very strong practicability, terseness, easy to operate.
Description
Technical field
The invention belongs to intelligent substation field, it is directed in intelligent substation in the applicable cases and operation of combining unit
Merge single cloud be delayed it is inconsistent caused by relevant issues, between especially a kind of solution intelligent substation difference combining unit
The on-site calibrating method of latency issue.
Background technique
Currently, intelligent substation is still in the primary stage in China, although State Grid Corporation of China proposes related intelligence and becomes
The debugging specification in power station, but also locate substantially about the single cloud device of the merging of the intelligent substation inconsistent on-site calibrating method that is delayed
In blank stage.The increasingly developed maturation of intelligent substation, new things and component part of the combining unit as intelligent substation,
In intelligent substation, realize that the intelligent apparatus of Data collecting conversion is combining unit, combining unit is in mutual inductor and protection
Equipment between device, initial data required for the standard devices such as protective device, measure and control device, metering device are exactly to pass through often
What rule or electronic current mutual inductor or voltage transformer acquired.Data are finally output to accordingly with the format information of SMV9-2
Device in, therefore its quality quality of data is obtained by combining unit and directly affects the operational safety of whole transformer station.
For the combining unit in different interval or different substation, each combining unit needs to be in always
It under synchronous regime, is generally realized by clock system, there are two types of sides for the synchronization scheme sheet that intelligent substation is implemented at present
1588 network time synchronization mode of formula, i.e. the light IRIG-B code method of synchronization or EEE.When corresponding data are sent out from combining unit
Reception device is transferred to by optical fiber after sending and needs certain time, this time is known as time delays.
When data information is transferred to identical protective device by networking or point-to-point mode from different combining units, by
There is strict demand to delay in the process to data processing of protective device, therefore prolongs from the data that different combining units receive
Shi Buneng difference is too big, otherwise will lead to protective device data handling procedure and mistake occurs, influences the correct movement of protective device.
But in actual operation often because combining unit delay is inconsistent to lead to false protection.This is to entire power grid system
The safe and stable operation of system produces major hidden danger, and rarely has the delay to each side combining unit different in literature research before
Cause problem carries out detailed analysis and proposes the content of corresponding field-checking scheme, how to debug stage discovery at the scene, solves
The problem, which is very important, also seems very urgent urgent.By being closed to " it is inconsistent that intelligent substation * merges list cloud * delay "
The literature search of key word, technology relevant to this patent mainly has following several respects, but is wherein not directed to different combining units
Be delayed the specific method and key technology main points of inconsistent field-checking between device, can not instruct the development of specific debugging efforts.
Existing relevant technical literature:
[1] Haitao Liu, Huang Mingyu, research [J] of Zhao Xuyang Intelligent substation merging unit time performance test problem
East china electric power, 2013,41 (1): 0119-0121
Document [1] points out that Intelligent substation merging unit is that intelligent substation is new compared under more traditional substation operation system
The smart machine of increasing, predominantly system provide original sampling data information.Describe intelligent substation and traditional substation most
Big difference is the change for being communication network system, and the introducing of combining unit solves the sharing problem of data, but brings therewith
Data information is unstable the unstability of transportation level, especially time performance, including time accuracy and communication
Lag characteristic.It discusses the test problem in combining unit test process and is researched and analysed
[2] design [J] the electric power of Ni Zhaorui, Wang Yanan Intelligent substation merging unit time-delay characteristics on-spot tester is protected
Shield and control, 2014,42 (10): 119-124.
Document [2] analyze Intelligent substation merging unit stationary problem and by live nuclear phase and check difference stream this
The limitation for the method whether one verifying each side electric current of differential protection synchronizes.Propose Intelligent substation merging unit time-delay characteristics
The design requirement of on-spot tester proposes a kind of architecture of on-spot tester based on demand analysis and set in detail
Meter.The finally time response of the time granularity to the tester realized according to the design method and combining unit cooperation aspect carries out
Detailed calculating and comparative analysis.Analysis shows the scene that the tester can effectively verify combining unit delay parameter is correctly set
It sets, prevents tuning error, meet onsite acceptance demand.
[3] point-to-point transmission sampled value postpones in Xu Min, Bao Youli, Li Baowei, Yang Shengping, Hao Huizhen intelligent substation
And delay checkschema [J] electric power system protection and control, 2012,40 (17): 145-149.
Document [3] analyzes in intelligent substation and transmits electronic mutual inductor analog quantity sampled value report using point-to-point mode
The timing of sampling and transmission link when literary, has obtained the composition of the analog quantity sampled value normal delay transmitted using point-to-point mode
Part.On this basis, a kind of method for verifying point-to-point transmission analog quantity sampled value normal delay correctness, this method are proposed
Phase error verification and analog quantity sampling value message in conjunction with analog quantity sampled value send the measurement of delay and specified prolong to verify its
The correctness of slow numerical value.The correctness and feasibility of this method are demonstrated by theory analysis and actual test.This method measurement
Precision is high, principle is simple, is easily achieved, and has the realistic meaning being widely popularized.
Summary of the invention
It is an object of the invention in place of overcome the deficiencies in the prior art, provide a kind of solution intelligent substation difference merging
The on-site calibrating method of latency issue between unit.
The present invention solves its technical problem and adopts the following technical solutions to achieve:
It is a kind of solve intelligent substation difference combining unit between latency issue on-site calibrating method, it is characterised in that: step
Suddenly are as follows:
(1) the size of the inconsistent time difference stream of analysis delay and the impact analysis to protection；
By there is each link analysis of delay to combining unit, for resampling link combining unit according to lock-out pulse
Resampling is carried out with the digital quantity sampled value time of reception after amendment, obtains the poor flow point class generated when being delayed inconsistent:
Different combining unit delays differ the difference stream or different combining unit delay difference integral multiples when non-integral multiple cycle
Difference stream when cycle；
(2) according to delay Analysis as a result, selection check method；
1. different combining unit delays differ method of calibration when non-integral multiple cycle
It a. is to each side combining unit while to use a relay-protection tester that experimental amount is added, and guarantee the phase of each side
Unanimously；
It b. is using more relay-protection testers, by GPS clock synchronization system by different relay-protection testers
It is synchronous；
2. method of calibration when different combining unit delay difference integral multiple cycles
A. it simulates each side electric current moment while increasing, if the combining unit delay of each side is inconsistent, after each side increases
Electric current is transferred to the Time Inconsistency of protective device, should will appear poor stream in the process；
B. plus the experimental amount of distorted waveform verifies.
In method of calibration moreover, the 2. different combining units of the step (2) are delayed when difference integral multiple cycle, two kinds
Method of calibration also uses separate unit tester or the more tester verifications after GPS is synchronized.
Moreover, the field-checking for configuring single set protective device.
Moreover, the verification for duplicate system retrofit protection first carries out test connection, according to electricity before verification step starts
It flows back to road to connect along polarity, the principle of voltage circuit same polarity parallel connection accesses two sets of main transformer protection devices；Specific mode of connection is:
1. current loop: protection test instrument output three-phase current head end is accessed to the three-phase of main transformer protection A screen device first
Electric current head end, then by the three-phase current head end of device tail end access B screen device, tail end is filled through zero sequence channel along polarity access A screen
Zero setting sequence channel, protection test instrument output electric current N line are connected with A screen device zero sequence channel tail end；
2. voltage circuit: by protection test instrument export three-phase voltage head end and N line respectively at main transformer protection A, B screen device
Three-phase voltage head end is connected, and N line is connected with three-phase voltage tail end through being shorted piece.
The advantages and positive effects of the present invention are:
1, it is delayed inconsistent on-site calibrating method, key technology the invention proposes Intelligent substation merging unit device
Main points are debugged, the combining unit at different interval, different station ends will be consistent in time synchronization and pass through stringent verification, with
It keeps protective device and obtains accurately data.
2, Tianjin Electric Power Transmission & Transformation Engineering Corporation's tissue debugging branch company related personnel, which explores and studies, prolongs between different combining units
When the inconsistent field-checking technology and methods that are verified simultaneously for two sets of protections of duplicate system retrofit.It facts have proved the verification
Methodological science is rigorous, effective, provides reliable foundation for the work of commissioning staff.
3, more importantly the technology substantially increases stability and reliability that combining unit verifies, guarantees data transmission
Correctness, the research achievement for Tianjin Xinhua Lu, Fan Zhuan 220kV substation combining unit verifying work, commissioning staff
Debugging task is satisfactorily completed according to this technology.
4, this method provides relevant thinking for the fault analysis and handling of similar problems from now on；For field adjustable, personnel are mentioned
A set of simple possible, reliable and practical method of calibration have been supplied, there is very big originality and reference value.
5, at trend, mode is usually conventional (electronics) formula current transformer, merges list for the development of intelligent substation
The configuration mode of member, protective device, the inconsistent situation of delay of this method to each side combining unit classify, respectively visit
It begs for, proposes the method for calibration and dual that each side combining unit new under corresponding different situations is delayed inconsistent on this basis
The method of calibration for configuring protective device has the characteristics that very strong practicability, terseness, easy to operate.
Detailed description of the invention
Fig. 1 is list covering device system check schematic diagram of the invention；
Fig. 2 is two covering device checkschema ac circuit schematic diagrams；
When Fig. 3 indicates that primary system operates normally, because of medium voltage side lag height, middle two sides non-integer multiple periods；
When Fig. 4 indicates that system operates normally, the high, medium and low three sides current sample of transformer is synchronous；
When Fig. 5 indicates that primary system operates normally, because the cycle of high and low pressure side one after medium voltage side current hysteresis, causes to become
The high, medium and low nonsynchronous situation of three sides current sample of depressor；
Fig. 6 is when indicating that primary system operates normally, because the cycle of high and low pressure side two after medium voltage side current hysteresis, is caused
The high, medium and low nonsynchronous situation of three sides current sample of transformer；
When Fig. 7 indicates passing through property of primary system failure, the synchronous situation of the high, medium and low three sides current sample of transformer；
Fig. 8 shows when primary system passing through property failure, asynchronous (the middle pressure of the high, medium and low three sides current sample of transformer
Survey 1 period of lag) the case where.
Specific embodiment
The invention will be further described with reference to the accompanying drawing and by specific embodiment, and following embodiment is descriptive
, it is not restrictive, this does not limit the scope of protection of the present invention.
It is a kind of solve intelligent substation difference combining unit between latency issue on-site calibrating method,
Embodiment 1: being referring to figure 1 the field-checking of the single set protective device of configuration:
(1) the size of the inconsistent time difference stream of analysis delay and the impact analysis to protection
By there is each link analysis of delay to combining unit, for resampling link combining unit according to lock-out pulse
Resampling is carried out with the digital quantity sampled value time of reception after amendment, and then completes the sample-synchronous between each collector, one
As be not in delay deviation；For transmission delay, substation's normal range (NR) inner fiber length will not be too long, so cannot draw
Play biggish delay can be ignored substantially.Relatively important is that the forward delay interval of combining unit determines that sampling value message is
The no error there are in sending instant.
After traditional mutual inductor is usually used using the processing of combining unit in the sampling system of intelligent substation at present
Data are directly passed through to optical fiber and are sent to corresponding protective device.It include the correlation of specified delay in the message that combining unit is sent
Information, this specified delay, that is, combining unit synchronization process delay, when different combining units specified delay be arranged it is inconsistent
When may cause false protection.This link is usually staff's human configuration by combining unit, the link error probability
Larger, because the accident caused for this reason also has several, therefore the link is the emphasis examined, and is paid particular attention to.
By taking main transformer protection device as an example, which, which is related to multiple intervals, has certain representativeness.No matter for two sides or
For the transformer of three side of person, main transformer protection device to the quality of data of each side require be it is very high, transform er differential protection is dynamic
Make the time generally within 20ms, thus it has strict demand for the delay of each side combining unit collection capacity.If not ipsilateral appearance
When being delayed inconsistent, it will lead to and occur difference stream in the calculating of main transformer protection device differential protection, poor flow valuve once reaches protection definite value
Differential protection is possible to meeting malfunction, to influence the reliability of protective device.It is main below to discuss that analysis delay is inconsistent
Various situations.In general can be divided into two classes: the first kind is that each side delay differs caused difference stream when non-integral multiple cycle；The
Difference stream when two classes are each side delay difference integral multiple cycles.
1. different combining unit delays differ difference stream when non-integral multiple cycle
When each side, which is delayed, differs non-integral multiple cycle, waveform at this time as shown in figure 3, when primary system operates normally,
Because medium voltage side lag height, middle two sides non-integer multiple periods, cause the high, medium and low nonsynchronous feelings of three sides current sample of transformer
Condition, at this time in spite of having poor stream in the protective device that breaks down, as long as reaching definite value, protection will malfunction.
At this point, relatively easy for examining in Fig. 3 in the case of, which can be directly by nuclear phase and in transformer
Check that poor stream can be found in protective device.
2. difference stream when different combining unit delay difference integral multiple cycles
For three side transformers, when operating normally, main transformer protection device needs while receiving the electric current number of three sides
According to, three side sample rate current recording waveform of tranformer protection as shown in figure 4,
At this time by Fig. 4,5,6 it is found that making because of medium voltage side and 360 ° of phase phase difference of high and low pressure side of integral multiple
When being tested or operated normally with relay-protection tester, difference stream is 0 after protective device calculates, and can not pass through conventional school
Proved recipe method nuclear phase and the poor Stream Discovery of the observing protector defect.
But when through fault occurs for primary system, generates passing through property fault current, because medium voltage side lags integral multiple
Cycle, will lead to passing through property fault current can not collect in synchronization times protective device, to can produce in protective device
Raw failure difference stream, false protection is caused when reaching certain numerical value, and the waveform when situation is as shown in Figure 7,8.
When Fig. 7,8 respectively indicate primary system passing through property failure, the high, medium and low three sides current sample synchronization of transformer,
The case where asynchronous (middle pressure surveys 1 period of lag).Can be seen that by the comparison of two figures will appear poor stream in nonsynchronous situation.It is right
For current protective device, transformer differential fast tripping protection whole group actuation time (including relay intrinsic time) is generally less than
20ms[3].As long as passing through property failure will lead to difference therefore when the data delay that protective device receives differs 1 period
Outflow now influences the correct movement of protective device, causes false protection.
Generation for above-mentioned two situations, basic reason are the delay parameter setting mistake of combining unit, lower mask body
Analysis discuss how to be solved the problems, such as in debugging process it is above-mentioned this.
(2) according to delay Analysis as a result, selection check method
Caused difference stream and each side are delayed when differing integral multiple cycle when for each side delay non-integral multiple cycle of difference
Difference two kinds of situations of stream, because respectively there is two kinds of situations particularity to pass through the test of conventional through-flow check protection device sampled value
Whether the delay that can not have verified each side combining unit is consistent, it is therefore desirable to and differentiation is treated, and proposes new method of calibration, below
Detailed discussion is done respectively to two kinds of situations:
1. different combining unit delays differ method of calibration when non-integral multiple cycle
The case where differing non-integral multiple cycle for the delay of each side combining unit, the processing method of the problem is relatively easy.
It a. is to each side combining unit while to use a relay-protection tester that experimental amount is added, and guarantee the phase of each side
Unanimously；Corresponding rated current is inputted, poor flow valuve is observed on the protection device, can verify that each side combining unit does not have if it is zero
With the presence of the mistake of difference non-integer cycle；If poor flow valuve is not zero, there are problems to solve；
It b. is using more relay-protection testers, by GPS clock synchronization system by different relay-protection testers
It is synchronous；Then three testers are passed through experimental amount to three side of main transformer respectively, and the consistent amplitude of phase of three testers of guarantee is
Corresponding rated current observes poor flow valuve on the protection device, and subsequent processes are same as above, and whether verify each side delay with this correct；
2. method of calibration when different combining unit delay difference integral multiple cycles
The case where each side combining unit delay difference integral multiple cycle, each side can not be verified by above-mentioned method one 1.
It whether consistent is delayed, because of passing through property failure, the failure amount period in 10ms or so, can take down according to above-mentioned analysis
Two methods are stated to verify, the two methods can also be used method 1. in separate unit tester or the more examinations after GPS is synchronized
Test instrument verification；
A. it simulates each side electric current moment while increasing, if the combining unit delay of each side is inconsistent, after each side increases
Electric current is transferred to the Time Inconsistency of protective device, should will appear poor stream in the process；
Such as medium voltage side lag high-pressure side differ 20ms, then electric current moment from 0 to high-pressure side rated current during, protect
Protection unit is firstly received high-pressure side and has first increased to rated current, and the magnitude of current of medium voltage side also needs to be delayed again after 20ms
It is calculated by protective device, this process just has poor stream, and in this 20ms, when poor stream reaches differential definite value, protection will be missed
Movement.
B. plus the experimental amount of distorted waveform verifies；
Such as normal of ac frequency is 50Hz, the experimental amount being passed through can become 20Hz to simulate transient fault electricity
Stream.At this point, the period of through fault current and the cycle period of standard are inconsistent, if combining unit delay difference integral multiple is just
Often exchange cycle, can also go on business stream when being passed through the experimental amount electric current that a-c cycle is 20Hz, to can verify that combining unit differs
The delay needs of normal cycle integral multiple are corrected；Conversely, each side combining unit is normal.
Embodiment 2: it show the method for calibration of duplicate system retrofit protection referring to attached drawing 2, following methods can be taken:
Test connection: according to drawing wiring, connecting according to current loop along polarity, the principle of voltage circuit same polarity parallel connection
Access two sets of main transformer protection devices；
Specific mode of connection is:
Current loop: protection test instrument output three-phase current head end is accessed to the three-phase electricity of main transformer protection A screen device first
Head end is flowed, then by the three-phase current head end of device tail end access B screen device, tail end accesses A screen device along polarity through zero sequence channel
Zero sequence channel, protection test instrument output electric current N line are connected with A screen device zero sequence channel tail end；
Voltage circuit: by protection test instrument export three-phase voltage head end and N line respectively at main transformer protection A, B screen device three
Phase voltage head end is connected, and N line is connected through being shorted piece (see attached drawing 2) with three-phase voltage tail end；
It introduces consistent in other verification steps and the single set protective device of configuration, is protected using two sets of main transformer in logic with this
On, feature with uniformity on circuit and in definite value, debugging on the basis of not needing increase personnel and experimental facilities can have
Improve working efficiency in effect ground.
Although disclosing the embodiment of the present invention and attached drawing for the purpose of illustration, those skilled in the art can be managed
Solution: do not departing from the present invention and spirit and scope of the appended claims in, various substitutions, changes and modifications be all it is possible,
Therefore, the scope of the present invention is not limited to the embodiment and attached drawing disclosure of that.
Claims (4)
1. the on-site calibrating method of latency issue between a kind of solution intelligent substation difference combining unit, it is characterised in that: step
Are as follows:
(1) the size of the inconsistent time difference stream of analysis delay and the influence to protection；
By there is each link analysis of delay to combining unit, resampling link combining unit according to lock-out pulse and is repaired
The digital quantity sampled value time of reception after just carries out resampling, obtains the poor flow point class generated when being delayed inconsistent:
Different combining unit delays differ the difference stream or different combining unit delay difference integral multiple cycles when non-integral multiple cycle
When difference stream；
(2) according to delay Analysis as a result, selection check method；
1. different combining unit delays differ method of calibration when non-integral multiple cycle
It a. is to each side combining unit while to use a relay-protection tester that experimental amount is added, and guarantee the phase one of each side
It causes；
It b. is to be synchronized different relay-protection testers by GPS clock synchronization system using more relay-protection testers；
More relay-protection testers are passed through experimental amount to main transformer side respectively, and guarantee the consistent width of the phase of more relay-protection testers
Value is corresponding rated current, observes poor flow valuve on the protection device, and whether verify each side delay with this correct；
2. method of calibration when different combining unit delay difference integral multiple cycles
A. it simulates each side electric current moment while increasing, if the combining unit delay of each side is inconsistent, the electric current after each side increase
It is transferred to the Time Inconsistency of protective device, poor stream should be will appear in the process；
B. plus the experimental amount of distorted waveform verifies；
The experimental amount electric current inconsistent with the cycle period of standard is passed through as through fault current, if combining unit delay difference
Integral multiple normal communication cycle, when experimental amount electric current being passed through, can also go on business stream, so that verifying combining unit differs normal cycle
The delay needs of integral multiple are corrected；Conversely, each side combining unit is normal.
2. the on-site calibrating method of latency issue between solution intelligent substation difference combining unit according to claim 1,
In method of calibration it is characterized by: the 2. different combining units of the step (2) are delayed when difference integral multiple cycle, two kinds of schools
Proved recipe method also uses separate unit tester or the more tester verifications after GPS is synchronized.
3. the on-site calibrating method of latency issue between solution intelligent substation difference combining unit according to claim 1,
It is characterized by: the field-checking for configuring single set protective device.
4. the on-site calibrating method of latency issue between solution intelligent substation difference combining unit according to claim 1,
It is characterized by: the verification for duplicate system retrofit protection first carries out test connection, according to electric current before verification step starts
Circuit is connected along polarity, and the principle of voltage circuit same polarity parallel connection accesses two sets of main transformer protection devices；Specific mode of connection is:
1. current loop: protection test instrument output three-phase current head end is accessed to the three-phase current of main transformer protection A screen device first
Head end, then by the three-phase current head end of device tail end access B screen device, tail end accesses A screen device zero along polarity through zero sequence channel
Sequence channel, protection test instrument output electric current N line are connected with A screen device zero sequence channel tail end；
2. voltage circuit: by protection test instrument export three-phase voltage head end and N line respectively at main transformer protection A, B screen device three-phase
Voltage head end is connected, and N line is connected with three-phase voltage tail end through being shorted piece.
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| CN102593952A (en) * | 2012-02-10 | 2012-07-18 | 深圳市科陆电子科技股份有限公司 | Intelligent substation merging unit |
| CN204287355U (en) * | 2014-12-15 | 2015-04-22 | 国家电网公司 | The specified time-delay detection system of Intelligent substation merging unit |
| CN105842571A (en) * | 2016-06-06 | 2016-08-10 | 国家电网公司 | Digital type input merging unit tester parallel and synchronous testing system and method |
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