CN108539714A - A kind of distributed element differential protecting method and system - Google Patents
A kind of distributed element differential protecting method and system Download PDFInfo
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- CN108539714A CN108539714A CN201810349063.6A CN201810349063A CN108539714A CN 108539714 A CN108539714 A CN 108539714A CN 201810349063 A CN201810349063 A CN 201810349063A CN 108539714 A CN108539714 A CN 108539714A
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- protection
- handset
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- handsets
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
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- Emergency Protection Circuit Devices (AREA)
Abstract
The present invention provides a kind of distributed element differential protecting method and systems; whether acted with other protection handsets judged in addition to one of protection handset; if one of protection handset has been turned on fault distinguishing; the case where then whether being acted according to other protection handsets in addition to one of protection handset determines that the protection of one of protection handset differentiates logic；If other protection handsets have acted; then simplify the operating criterion of one of protection handset; ensure that this protection handset fast trip exports; ensure that each protection handset with most fast speed isolated fault point, avoids and has an adverse effect to the action behavior of adjacent protective device or automatic safety device.Solves across the spacer element protection of distributed installation, the configuration of the dereliction formula complex fault in area; inconsistent problem of each interval trip time, it is ensured that each to protect acting in agreement for handset action behavior under any failure; and failure can be quickly isolated, improve power supply reliability.
Description
Technical field
The invention belongs to Relay Protection Technology in Power System field, more particularly to a kind of distributed element differential protecting method
And system.
Background technology
Currently, as intelligent substation is quickly grown, Protection Technology innovation is effectively pushed, but also expose
Problem.Intelligent substation is delayed due to the processing of combining unit and intelligent terminal so that the whole group actuation time of protection is close
System stability Calculation boundary, intelligent substation relay protection multiple technologies route are simultaneously deposited, and engineering philosophy disunity, developing direction is not
It is clear, or even relay protection " four property " basic principle is breached, bring many potential risks, intelligent substation to protect to operation of power networks
Shield technology is urgently promoted.National grid tune (2017) 458《State Grid Corporation of China develops about company's Protection Technology is printed and distributed
The notice of outline》It is required that determining that future intelligent substation relay protection is used so that " sampling digitizing, protection site, element are protected
The site protection new technology that shield private network, information sharing " is characterized, the wherein element protections such as main transformer protection and bus protection
Using the protection system of the installation of more handset distributions, the configuration of dereliction formula.
Main transformer protection using distributed installation, dereliction formula configuration mode, each analog quantity for protecting handset to acquire this side and
Switching value exports this side switch trip outlet, and each protection handset is connected by loop network head and the tail, shares analog quantity information.
Each protection handset has complete defencive function, main transformer protection structure as shown in Figure 1 simultaneously.
Bus protection is made of multiple protection handsets using distributed installation, dereliction formula configuration mode, is each protected handset
The analog quantity and switching value at certain amount interval are can access, output connects interval switch trip outlet, and each protection handset passes through
Loop network head and the tail connect, and share analog quantity information.Each handset has complete defencive function simultaneously, and bus protection structure is such as
Shown in Fig. 2.
Distributed element protection uses the differential protecting method based on Kirchhoff's current law (KCL), and principle is simple and reliable, moves
It is fast to make speed, such as Publication No. " CN105703332A ", the entitled " differential protecting method and its dress of the anti-TA saturations of transformer
Set " Chinese patent, which is：The electric current of protected element is acquired, N number of electric current is acquired in each electric current cycle
Sampled point, and determine that the initial time of failure is sentenced if the variable quantity of stalling current and the variable quantity of difference current occur simultaneously
Break as troubles inside the sample space, startup differential protection；If the variable quantity of stalling current occurs prior to the variable quantity of difference current, judge
For external area error.By the criterion of setting, more accurately judgement is troubles inside the sample space or external area error, can effectively prevent electricity
Flow differential protection malfunction.It is each that handset analog quantity sampling instant is protected to exist but under distribution installation, dereliction formula configuration mode
Difference, the fault current that handset reflects respectively is protected in the case where complex fault occurs, and there are a little differences, and then influence
The action behavior for protecting handset in whole system individually, it is inconsistent to be embodied in movement speed.By dynamic model simulating, verifying,
It is each that handset protection act Outlet time is protected to have 30-50ms differences during saturation turns troubles inside the sample space outside developing fault and area,
It is reacted in practical power systems, is exactly the breaker tripping time phase difference 30-50ms being connected with fault point, this not only influences electricity
The work of power production management department, it is unfavorable more seriously to be generated to the action behavior of adjacent protective device or automatic safety device
It influences, in some instances it may even be possible to which the tripping that causes to bypass the immediate leadership leads to prodigious loss, so that bringing a series of undesirable social influences.So
Ensure element protection action consistency under distributed installation, dereliction formula configuration mode, to electricity safety production, power system security
Stable operation is played the role of vital for raising power supply reliability.
Invention content
The purpose of the present invention is to provide a kind of distributed element differential protecting method and systems, for solving more protection
The problem for respectively protecting the protection act behavior of handset inconsistent under the installation of machine distribution, dereliction formula configuration mode.
To achieve the above object, the present invention provides a kind of distributed element differential protecting method, include the following steps：
When any one protection handset starts differential protection, appointing in other protection handsets in addition to the protection handset is judged
Whether one protection handset acts, if the protection handset action of any of other protection handsets in addition to the protection handset,
Differential logic differentiation only is carried out to the protection handset for starting differential protection, if differential logic differentiation meets operation condition, is started
The protection handset of differential protection acts.
In order to correctly select the action of distributed element differential protection to differentiate logic, if judging except one of protection
When other protection handsets outside machine are not operating, then the protection handset for starting differential protection inside and outside area differentiate, is saturated and sentences
, wave character does not differentiate and differential logic differentiates, if judge area it is inside and outside differentiate, saturation differentiates, wave character differentiation and differential patrols
It collects and differentiates that the protection handset for then starting differential protection acts when being satisfied by operation condition, while sending and moving to other protection handsets
Work indicates.It ensure that the consistency of each protection handset action.
Validity in order to solve the problems, such as action state data is low, and the action mark is sent out by action state data
It send, the action state data are sent to other protection handsets by the way of positive and inverse code coding, other protection handsets are to receiving
The data of the positive and inverse code coding arrived carry out positive and negative code check.Improve the validity of action state data.
Judge whether any of other protection handsets in addition to protection handset protection handset acts, is to pass through parsing
Action state data are realized.More accurately judge whether other protection handsets act.
If judging the protection handset action of any of other protection handsets outside the protection handset, start differential guarantor
It is latched simultaneously when the protection handset action of shield to other protection handset sending action marks.Avoid repetition sending action state mark
Will solves the problems, such as that the differential protection actuation time of each protection handset is inconsistent.
It is each to protect the present invention also provides a kind of distributed element differential protective system, including at least two protection handsets
Handset is connected by looped network, when any one protection handset starts differential protection, judges other protections in addition to the protection handset
Whether any of handset protection handset acts, if any of other protection handsets in addition to protection handset protection
Motor-driven work then only carries out differential logic differentiation to the protection handset for starting differential protection, if differential logic differentiates that satisfaction acts item
Part then starts the protection handset action of differential protection.
In order to correctly select the action of distributed element differential protection to differentiate logic, if judging except one of protection
When other protection handsets outside machine are not operating, then the protection handset for starting differential protection inside and outside area differentiate, is saturated and sentences
, wave character does not differentiate and differential logic differentiates, if judge area it is inside and outside differentiate, saturation differentiates, wave character differentiation and differential patrols
It collects and differentiates that the protection handset for then starting differential protection acts when being satisfied by operation condition, while sending and moving to other protection handsets
Work indicates.It ensure that the consistency of each protection handset action.
Validity in order to solve the problems, such as action state data is low, and the action mark is sent out by action state data
It send, the action state data are sent to other protection handsets by the way of positive and inverse code coding, other protection handsets are to receiving
The data of the positive and inverse code coding arrived carry out positive and negative code check.Improve the validity of action state data.
Judge whether any of other protection handsets in addition to protection handset protection handset acts, is to pass through parsing
Action state data are realized.More accurately judge whether other protection handsets act.
If judging the protection handset action of any of other protection handsets outside the protection handset, start differential guarantor
It is latched simultaneously when the protection handset action of shield action to other protection handset sending action marks.Avoid repetition sending action shape
State mark solves the problems, such as that the differential protection actuation time of each protection handset is inconsistent.
The beneficial effects of the invention are as follows：
When any one protection handset of the present invention starts differential protection, judge in other protection handsets in addition to the protection handset
Either one or two of protection handset acted, then simplify the operating criterion of one of protection handset, only to starting differential guarantor
The protection handset of shield carries out differential logic differentiation, if differential logic differentiation meets operation condition, starts the protection of differential protection
Handset acts, and ensures that this protection handset fast trip exports, it is ensured that and respectively protect handset with most fast speed isolated fault point,
It avoids and has an adverse effect to the action behavior of adjacent protective device or automatic safety device.The present invention solves distributed peace
Dress, the configuration of dereliction formula across spacer element protection in area complex fault, inconsistent problem of each interval trip time,
Ensure under any failure, it is each to protect acting in agreement for handset action behavior, and failure can be quickly isolated, it is reliable to improve power supply
Property.
Description of the drawings
Fig. 1 is distributed main transformer protection system structure diagram；
Fig. 2 is decentralized bus protection system construction drawing；
Fig. 3 is the flow chart for the detection method that the distributed element differential protection of the present invention is kept strokes；
Fig. 4 is other protection handset protection act condition discrimination flow charts；
Fig. 5 is relay protective scheme figure when other protection handsets have acted；
Fig. 6 is relay protective scheme figure when other protection handsets are not operating.
Specific implementation mode
The specific implementation mode of the present invention is further described below in conjunction with the accompanying drawings：
Distributed element differential protection completes a whole set of defencive function by multiple protection handset coordinateds, each protects handset
Collecting part spaced simulation amount, the analog quantity acquired and meanwhile be supplied to this protection handset and other protection handsets use, meanwhile,
Each protection handset is provided with independent relay protective scheme function, since each protection handset analog quantity sampling instant has differences,
After filtered calculating and occur respectively to protect the reflected fault current of handset there are a little difference in the case of complex fault,
And then influence to protect individually the action behavior of handset in whole system, it is inconsistent to be embodied in action behavior.
In order to solve problem above, the present invention provides a kind of distributed element differential protective systems, including at least two
Handset is protected, it is each that handset is protected to be connected by looped network, when any one protection handset starts differential protection, judge except protection
Whether any of other protection handsets outside machine protection handset acts, if in other protection handsets in addition to the protection handset
Either one or two of protection handset action, then to start differential protection protection handset carry out differential logic differentiation, if differential logic is sentenced
Do not meet operation condition, then starts the protection handset action of differential protection.
The method that differential protection is carried out to each protection handset using distributed element differential protective system, as shown in figure 3, packet
Include following steps：
Step 1：Differentiate whether other any protection handsets have acted in a whole set of protection system；The purpose is to judge the whole series
Whether other protection handsets act prior to this protection handset in protection, provide and sentence for the selection of the differential protection scheme of step 2
Other foundation.Including protecting the handset data framing transmission of action state and being connect to other protection handset action state data
Receipts judge two parts.
(1) framing transmitting portion concrete scheme is：If some protection handset differentiates through complete relay protective scheme, meet default
Operation condition after trip outlet, and do not receive other marks for having acted of protection handsets, then by the action of this protection handset
Isloation state is sent to other protection handsets.The distributed element differential protection that the present embodiment is claimed refers to that distributed main transformer is protected
Shield or bus protection, the action isloation state of wherein main transformer protection include A phases indulge it is differential make, B phases indulge it is differential make, C phases indulge it is differential
Work, A, which differ the disconnected action of flow velocity, B difference flow velocitys break acts, the disconnected action of C difference flow velocitys, and the action isloation state of bus protection includes 1
Female A phases act, 1 mother's B phases act, 1 mother's C phases act, 2 mother's A phases act, 2 mother's B phases act, 2 mother's C phases act, 3 mother's A phases act, 3
Female B phases act, 3 mother's C phases act.The reliability of data transmission, the number that protection act state is sent between each protection handset of guarantee
According to framing by the way of hybrid coding, protection act state is converted into shape data, one is indicated per tetrad data
A state, wherein 1010 expression states are true, 0101 expression state is false；In view of bus protection needs 9 split-phases of transmission dynamic
Make state, 32 unsigned numbers can be expressed as 8 four figures, and each four figures indicates a kind of working condition, i.e., one 32
Unsigned number can transmit 8 working conditions, due to bus protection need transmit 9 working conditions, it is contemplated that data it is consistent
Property, then it needs to transmit 9-16 working condition using another 32 unsigned number, that is, needs using 2 32 without symbol
Number.
Abnormal to occur in prevention data transmission process, data bit is written over and influences the correct solution of other protection handsets
Analysis, the data encoding of guard mode is by the way of positive and inverse code cooperation, and positive and inverse code does not embody in same 32 data, institute
4 32 digits are needed in total to transmit 9 working conditions, and wherein data 1 are the code of 8 action states, data 28 thus
The radix-minus-one complement of action state, data 3 are the code of another 8 action states, and data 4 are its radix-minus-one complement.Such as low four 1010 of data 1
With data 2 at low four 0101, indicate that 1 mother's A phase action states are true, when low the four of low four 0101 of data 1 and data 2
When position 1010, indicate that 1 mother's A phase action states are false.To ensure the timeliness of protection act state transfer, in protection handset transmission
4 32 spaces without symbol shape data are opened up in the message of sample values for depositing protection act status data, are protected
It protects after the completion of action state data framing, time 4 32 each data bit without symbol shape data is written in order, if action
Status data deficiency is sent after the completion of then using 0 filling polishing, data to be packaged using the time interval timing of 250 microseconds.
(2) receiving judgment part concrete scheme is：In the operational process of each protection handset, task execution process real-time reception
The data packet of other all protection handsets, is handled one by one for each data packet, and data packet passes through by CRC check and verification
Afterwards, then the data bit for wherein representing protection act state is extracted, then carries out the data bit for representing each action state just
Radix-minus-one complement verifies, and positive and negative code check carries out state and very differentiates with state vacation after passing through.If wherein there is the same class of any protection handset
Action state is true, then it is true to set other protection handsets and acted mark, for example bus protection handset 2 receives protection handset
1 A phase differential action marks, then it is true to set other protection handset A phases and act mark.To ensure that data are effective.Reliably use it
He protects the guard mode of handset, it is contemplated that and electric power system fault maximum length in time is less than 10s, so, differentiate other protections
The term of validity of handset protection act state is 10s, is more than if receiving some protection handset protection act state duration
10s, then it is assumed that the state is insincere, is judged to invalid data.Other protection handset action state data decodings and decision logic are such as
Shown in Fig. 4.
Step 2：If this protection handset has differentiated that starting differential protection differentiates, other interior any guarantors are protected according to the whole series
The case where whether shield handset acts determines that the protection of this protection handset differentiates logic；Wherein, no other protection handset action marks
When, this protection handset differential protection carries out the inside and outside differentiation in complete area, saturation identification, wave character identification and differential logic and sentences
Not, tripping outlet when meeting operation condition, while protecting handset sending action mark to other；If any in other protection handsets
In the case that a protection handset has acted, this protection handset simplification action differentiates logic, only differentiates whether differential logic meets
Operation condition, outlet of tripping if meeting operation condition, while being latched to other protection handset sending action marks.
For step 2, the purpose is to select the action of distributed element differential protection to differentiate logic.In this protection handset failure
It after startup, has discriminated whether that other handsets have acted mark first, has simplified differential logic if thering are other handsets to act mark
Differentiate logic, no longer carry out area it is inside and outside differentiate, saturation identification etc., only differentiate that differential logic meets operation condition and trips outlet；
Action logic is as shown in Figure 5 (by taking A phases are differential as an example).If not receiving other protection handsets has acted mark, this protection
Machine strictly carries out the inside and outside differentiation in area, saturation identification, fault waveform identification and differential logic and differentiates, meets action outlet after condition,
Other protection handset action states are continued to monitor at this time, if other protection handset action states are not received always, in this protection
This protection handset action mark is sent to other protection handsets while handset exports, action logic (is differed as shown in Figure 6 with A
For dynamic).
The present invention increases each protection handset collaboration in the element protection in distributed installation, dereliction formula configuration mode
The link of operation first determines whether other protection handsets act in entire protection system, according to the action of other protection handsets
Situation determines the protection act logic of this protection handset；Wherein, if other protection handsets have acted, simplify this protection
The operating criterion of machine ensures that this protection handset fast trip exports.It can avoid depositing because of each protection handset analog quantity sampling instant
In difference and the not quite identical influence of fault current waveform feature after filtered calculating, caused by respectively protect handset dynamic
Make behavior inconsistence problems.By simulating, verifying, in each quasi-representative and complex fault, when each protection handset protection act exports
Between the time difference be no more than 5 milliseconds, make it is each protection handset action behavior step it is almost the same.And each handset is can ensure that with most fast
Speed isolated fault point, avoid the action behavior to adjacent protective device or automatic safety device from having an adverse effect, ensure
Power system security stable operation improves power supply reliability.
Specific embodiment is presented above, but the present invention is not limited to embodiment described above.The present invention
Basic ideas be above-mentioned basic scheme, for those of ordinary skill in the art, introduction according to the present invention is designed each
The model of kind deformation, formula, parameter do not need to spend creative work.The case where not departing from the principle and spirit of the invention
Under to embodiment carry out variation, modification, replacement and deformation still fall in protection scope of the present invention.
Claims (10)
1. a kind of distributed element differential protecting method, which is characterized in that include the following steps：
When any one protection handset starts differential protection, any of other protection handsets in addition to the protection handset are judged
Whether protection handset acts, if the protection handset action of any of other protection handsets in addition to the protection handset, only right
The protection handset for starting differential protection carries out differential logic differentiation, if differential logic differentiation meets operation condition, starts differential
The protection handset of protection acts.
2. distributed element differential protecting method according to claim 1, which is characterized in that if judging except described wherein one
When other protection handsets outside a protection handset are not operating, then the protection handset for starting differential protection inside and outside area sentence
Not, saturation differentiation, wave character differentiation and differential logic differentiation differentiate if judging that area is inside and outside, are saturated differentiation, wave character differentiation
And differential logic differentiates that the protection handset for then starting differential protection acts when being satisfied by operation condition, at the same it is sub to other protections
Machine sending action mark.
3. distributed element differential protecting method according to claim 2, which is characterized in that the action mark passes through dynamic
Make status data transmission, the action state data are sent to other protection handsets, other guarantors by the way of positive and inverse code coding
Shield handset carries out positive and negative code check to the data of the positive and inverse code coding received.
4. distributed element differential protecting method according to claim 3, which is characterized in that judge in addition to the protection handset
Other protection any of handsets protection handsets whether act, realized by parsing action state data.
5. distributed element differential protecting method according to claim 1, which is characterized in that start the protection of differential protection
It is latched simultaneously when handset acts to other protection handset sending action marks.
6. a kind of distributed element differential protective system, which is characterized in that each to protect handset logical including at least two protection handsets
Looped network connection is crossed, when any one protection handset starts differential protection, is judged in other protection handsets in addition to the protection handset
Either one or two of protection handset whether act, if other protection any of handsets protection handsets in addition to the protection handset are dynamic
Make, then differential logic differentiation only is carried out to the protection handset for starting differential protection, if differential logic differentiation meets operation condition,
Start the protection handset action of differential protection.
7. distributed element differential protective system according to claim 6, which is characterized in that if judging except described wherein one
When not operating in other protection handsets outside a protection handset, then the protection handset for starting differential protection inside and outside area sentence
Not, saturation differentiation, wave character differentiation and differential logic differentiation differentiate if judging that area is inside and outside, are saturated differentiation, wave character differentiation
And differential logic differentiates that the protection handset for then starting differential protection acts when being satisfied by operation condition, at the same it is sub to other protections
Machine sending action mark.
8. distributed element differential protective system according to claim 7, which is characterized in that the action mark passes through dynamic
Make status data transmission, the action state data are sent to other protection handsets, other guarantors by the way of positive and inverse code coding
Shield handset carries out positive and negative code check to the data of the positive and inverse code coding received.
9. distributed element differential protective system according to claim 8, which is characterized in that judge in addition to the protection handset
Other protection any of handsets protection handsets whether act, realized by parsing action state data.
10. distributed element differential protective system according to claim 6, which is characterized in that start the guarantor of differential protection
It is latched simultaneously when shield handset action to other protection handset sending action marks.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810349063.6A CN108539714B (en) | 2018-04-18 | 2018-04-18 | Distributed element differential protection method and system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810349063.6A CN108539714B (en) | 2018-04-18 | 2018-04-18 | Distributed element differential protection method and system |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104393567A (en) * | 2014-11-20 | 2015-03-04 | 许继集团有限公司 | Differential protection method for distributed transformer |
| CN105896470A (en) * | 2016-06-03 | 2016-08-24 | 南京国电南自电网自动化有限公司 | Double loop network-based protection device free of main in-situ transformer and protection method |
-
2018
- 2018-04-18 CN CN201810349063.6A patent/CN108539714B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104393567A (en) * | 2014-11-20 | 2015-03-04 | 许继集团有限公司 | Differential protection method for distributed transformer |
| CN105896470A (en) * | 2016-06-03 | 2016-08-24 | 南京国电南自电网自动化有限公司 | Double loop network-based protection device free of main in-situ transformer and protection method |
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| CN108539714B (en) | 2020-01-14 |
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