CN106356822B - A kind of deficient range combinations formula guard method of half-wave power transmission route and device - Google Patents
A kind of deficient range combinations formula guard method of half-wave power transmission route and device Download PDFInfo
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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
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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Abstract
Deficient range combinations formula guard method and device the present invention relates to a kind of half-wave power transmission route; the step of by anti-distance protection method protection circuit middle section: impedance magnitude is calculated in acquisition route single ended voltage electric current; according to the relationship of impedance magnitude and the first setting value; judge whether route breaks down; by adjusting the size of the first setting value, make the middle section of anti-Distance Protection Components protection circuit；The step of by anti-distance protection method protection circuit middle section: the jump-value of current at acquisition route both ends; according to the relationship of the modulus value of the difference of the Sudden Changing Rate at both ends and the second setting value; judge whether route breaks down; by adjusting the size of the second setting value, make the both ends of active Sudden Changing Rate differential protection element protection route.Method proposed by the present invention combines anti-distance protection method and active Sudden Changing Rate differential protection method, realizes the protection of half-wave power transmission total track length.
Description
Technical field
Deficient range combinations formula guard method and device the present invention relates to a kind of half-wave power transmission route, belong to electric system
Technical field of relay protection.
Background technique
With the construction of energy internet, overlength route UHV transmission technology is had been a great concern, and half-wavelength is defeated
Power technology has a good application prospect, while as a kind of efficient remote intercontinental power transmission mode in China " Xi electricity Dong
It is send, north and south supply mutually, on national network " electric power development strategy in, it is remote, the power transmission mode of large capacity is inevitable.But it is special
High pressure half wavelength line transmission distance is long, and there are larger differences for fault signature and existing line, such as when the failure of route middle part
Fault current it is especially small, measurement impedance be no longer in apart from relevant monotonic nature；
Such as a kind of adaptive half wavelength line differential protecting method based on time difference method of Chinese patent CN105576623A,
The actuation time difference of starting element is protected to estimate the position of fault point by two sides.Adaptively changed according to the difference of position of failure point
The restraint coefficient and threshold value of transformer differential protection.But this method can not achieve all fronts covering of half wavelength line, detection electricity
When stream, occur that both ends electric current is larger, and electric current lesser problem in middle section is unable to judge accurately failure when failure is located at middle part.
As " hair roc, daytime long day, improvement [J] Automation of Electric Systems of Yang Wei Inverse Time Characteristic of Distance Protection, 2008,
Inverse time lag distance protecting method described in 06:71-75. ", can only realize the protection of route middle section 200km, and can not achieve both ends
Protection.
Therefore, existing protection philosophy can not be all applicable in completely in half wavelength line, or can not protection circuit overall length, this is right
The engineer application of extra-high voltage half-wave power transmission technology causes strong influence, need to invent the new guard method of one kind to solve to pass
Blanket insurance protects existing dead zone and compatibility issue.
Summary of the invention
Deficient range combinations formula guard method and device it is an object of that present invention to provide a kind of half-wave power transmission route are realized
The all fronts of half-wave power transmission route are protected, and solving traditional protection can not protection circuit overall length and existing compatibility issue.
To achieve the above object, the invention proposes a kind of deficient range combinations formula guard method of half-wave power transmission route,
The step of by anti-distance protection method protection circuit middle section: modulus of impedance is calculated in acquisition route single ended voltage electric current
Value, according to the relationship of impedance magnitude and the first setting value, judges whether route breaks down, by adjusting the big of the first setting value
It is small, make the middle section of anti-Distance Protection Components protection circuit；The step of by anti-distance protection method protection circuit middle section: acquisition route
Whether the jump-value of current at both ends judges route according to the relationship of the modulus value of the difference of the Sudden Changing Rate at both ends and the second setting value
It breaks down, by adjusting the size of the second setting value, makes the both ends of active Sudden Changing Rate differential protection element protection route.
Further, when route breaks down, anti-distance protection method judges the foundation of failure are as follows:
Wherein, ZfFor the impedance magnitude that anti-Furthest Neighbor is calculated,For the voltage of acquisition,For the electric current of acquisition,
ZsetFor the first definite value；When the impedance magnitude being calculated is greater than the first setting value, it is judged as line failure, passes through tune
The size of whole first setting value makes anti-Distance Protection Components protection circuit middle section.
Further, when route breaks down, active Sudden Changing Rate differential protection method judges the foundation of failure are as follows:
Wherein, IsetFor protection act definite value namely the second setting value, K is the restraint coefficient of stalling current,It is
Make electric current,Stalling current,The difference of phase currents at route both ends；According to the difference of the Sudden Changing Rate at both ends
The relationship of modulus value and the second setting value, judges whether route breaks down；The time that route both ends perceive failure is obtained, is passed through
The time that both ends perceive failure relatively determines the specific location that failure may occur, and then actively adjusts the braking of stalling current
Coefficient identifies failure；The size for adjusting the second setting value makes the both ends of active Sudden Changing Rate differential protection element protection route.
The present invention also provides a kind of deficient range combinations formula protective devices of half-wave power transmission route, comprising:
By the unit in anti-distance protection method protection circuit middle section, resistance is calculated by acquiring route single ended voltage electric current
Anti- modulus value judges whether route breaks down according to the relationship of impedance magnitude and the first setting value, by adjusting the first setting value
Size, make the middle section of anti-Distance Protection Components protection circuit；
By the unit at active Sudden Changing Rate differential protection method protection circuit both ends, by the current break for acquiring route both ends
Amount, according to the relationship of the modulus value of the difference of the Sudden Changing Rate at both ends and the second setting value, judges whether route breaks down, passes through tune
The size of whole second setting value makes the both ends of active Sudden Changing Rate differential protection element protection route.
Further, when route breaks down, the foundation of the unit judges failure of failure is judged by anti-distance protection method
Are as follows:
Wherein, ZfFor the impedance magnitude that anti-Furthest Neighbor is calculated,For the voltage of acquisition,For the electric current of acquisition,
ZsetFor the first definite value；When the impedance magnitude being calculated is greater than the first setting value, it is judged as line failure, passes through tune
The size of whole first setting value makes anti-Distance Protection Components protection circuit middle section.
Further, when route breaks down, the unit judges event of failure is judged by active Sudden Changing Rate differential protection method
The foundation of barrier are as follows:
Wherein, IsetFor protection act definite value namely the second setting value, K is the restraint coefficient of stalling current,It is
Make electric current,Stalling current,The difference of phase currents at route both ends；According to the difference of the Sudden Changing Rate at both ends
The relationship of modulus value and the second setting value, judges whether route breaks down；The time that route both ends perceive failure is obtained, is passed through
The time that both ends perceive failure relatively determines the specific location that failure may occur, and then actively adjusts the braking of stalling current
Coefficient identifies failure；The size for adjusting the second setting value makes the both ends of active Sudden Changing Rate differential protection element protection route.
The invention has the characteristics that:
1) it has invented two kinds of relay protective scheme principles for being suitable for half wavelength line, and the advantage by two kinds of different principles is mutual
It mends, realizes the purpose of covering total track length；
2) anti-principle of distance relay can realize the highly sensitive protection of half wavelength line central section by one-terminal data；
3) two end section of half wavelength line can be achieved by both-end amount based on GPS synchronous active Sudden Changing Rate differential protection
Protection.
Detailed description of the invention
Fig. 1 is that half-wavelength owes range combinations formula guard method schematic diagram；
Fig. 2 is anti-distance protection method schematic diagram；
Fig. 3 is active Sudden Changing Rate differential protection method schematic diagram；
Fig. 4 is that half-wavelength owes range combinations formula protective device schematic diagram.
Specific embodiment
The technical solution of the present invention is as follows: modulus of impedance is calculated by acquiring route single ended voltage electric current in anti-distance protection method
Value, according to the relationship of impedance magnitude and the first setting value, judges whether route breaks down, by adjusting the big of the first setting value
It is small, make the middle section of anti-Distance Protection Components protection circuit；The electric current that active Sudden Changing Rate differential protection method passes through acquisition route both ends
Sudden Changing Rate judges whether route breaks down according to the relationship of the modulus value of the difference of the Sudden Changing Rate at both ends and the second setting value, leads to
The size for crossing the second setting value of adjustment, makes the both ends of active Sudden Changing Rate differential protection element protection route.
The realization for owing the guard method of range combinations formula need to respectively install a protective relaying device at half wavelength line both ends, and two
Platform device configures identical deficient range combinations formula relay protective scheme.Owing the guard method of range combinations formula includes two kinds of relay protective scheme originals
Reason, one kind are anti-principle of distance relay, by measuring the voltage and current at line one-end end, so that line impedance modulus value is calculated,
By the size of impedance magnitude judge in the middle part of route whether failure, the setting of definite value need to consider to escape route external area error and without reason
Impedance magnitude when barrier；Another kind is the active Sudden Changing Rate differential protection synchronous based on GPS, by measuring route both ends electric current,
According to the Sudden Changing Rate of sampled value calculating current, judge whether that the both ends of line-internal are sent out by the difference modulus value of the Sudden Changing Rate at both ends
Raw failure；And markers when by both ends protective device fault initiating, judge the substantially section that failure occurs, actively to adjust braking
The coefficient of electric current realizes effective identification of failure.It is realized the present invention is based on above two relay protective scheme and owes the protection of range combinations formula
Method, and by corresponding Trip Logic disconnect half wavelength line both ends breaker, realize covering half wavelength line overall length without
Dead zone protection.
Technical solution of the present invention is described further with reference to the accompanying drawing:
The guard method of range combinations formula is owed for half-wavelength of the present invention as shown in Figure 1, this guard method is in route two
Each configuration one deficient range combinations formula protective device A and B are held, the identical deficient range combinations formula protection of every protective device configuration is calculated
Method realizes the protection of half wavelength line overall length with two devices.In this guard method, is realized and protected by anti-principle of distance relay
The protection of protection scope II is realized in the protection for protecting range I by active Sudden Changing Rate Differential Protection Theory.Protection scope I can substantially account for
300 kilometers or so of 70% or so of total track length, the removing of protection scope II middle part can also cover.Underreaching protection method
Although two protection philosophies individually from the point of view of be all underreaching protection, total track length can not be covered, the two is through cooperating more
It mends, it can be achieved that total track length is without covering protection.
The anti-principle of distance relay is realized by acquiring the voltage and current of protection infield in line one-end,
Its operation equation when phase-to phase fault are as follows:
Wherein, ZfFor the impedance that anti-Furthest Neighbor is calculated,For the voltage of acquisition,For the electric current of acquisition, ZsetFor
Definite value, voltage and current meets distributed parameters equation on half wavelength line, so the impedance magnitude being calculated is meeting hyperbolic just
Cut function, anti-Distance Protection Algorithm compared to distance protection and is being calculated only using the modulus value of impedance as judgment basis
Protection act when impedance magnitude is greater than definite value；Since impedance magnitude meets hyperbolic tangent function, as shown in Fig. 2, so half-wavelength
Route both ends measure that impedance magnitude is smaller, and middle part is larger, outside area nearby failure when cannot be distinguished inside and outside area, therefore the setting of definite value needs
Maximum impedance modulus value when escaping external area error is considered to determine.When operation equation meets, it may be determined that be in half wavelength line
Portion breaks down, and solves the problems, such as in the middle part of half wavelength line that fault current is smaller and is difficult to judge.
The active Sudden Changing Rate Differential Protection Theory is constituted by acquiring the difference of phase currents at route both ends, it
Action currentStalling currentIt is respectively as follows:
Operation equation is
Wherein, IsetFor protection act definite value, K is the restraint coefficient of stalling current,For action current,Braking
Electric current,The difference of phase currents at route both ends.Active Sudden Changing Rate Differential Protection Theory refers to that this protection philosophy is logical
It crosses synchronous with GPS, obtains route both ends and perceive time of failure, the tool that failure may occur relatively is determined by the both ends time
Then body position actively adjusts the restraint coefficient of stalling current, so that effectively identification is out of order.The value of restraint coefficient is as follows:
As 6.6ms < Δ t < 10ms or -10ms < Δ t < -6.6ms, K=0.4；
As 3.3ms < Δ t < 6.6ms or -6.6ms < Δ t < -3.3ms, K=0.2；
The logic theory of active Sudden Changing Rate differential protection when the initiating element starting of both ends protection as shown in figure 3, record
Starting time, and wait opposite end protection to send and start information and starting time, if not receiving what opposite end was sent in setting time
Start information, then it is assumed that be local terminal false protection and involution；If receiving the starting information sent opposite end, when being started to both ends
Between be compared, judge possible breakdown position and actively adjust restraint coefficient, then progress Sudden Changing Rate differential current computing, thus
Judge whether break down in area.This protection philosophy not only has good sensitivity, and solves stalling current and movement
Curent change is inconsistent to be difficult to the problem of adjusting.
A kind of deficient range combinations formula protective device of half-wave power transmission route has also been devised in the present invention, comprising:
Modulus of impedance is calculated by acquiring route single ended voltage electric current in the unit that failure is judged by anti-distance protection method
Value, according to the relationship of impedance magnitude and the first setting value, judges whether route breaks down, by adjusting the big of the first setting value
It is small, make the middle section of anti-Distance Protection Components protection circuit；
The unit that failure is judged by active Sudden Changing Rate differential protection method, by acquiring the jump-value of current at route both ends,
According to the relationship of the modulus value of the difference of the Sudden Changing Rate at both ends and the second setting value, judge whether route breaks down, by adjusting
The size of second setting value makes the both ends of active Sudden Changing Rate differential protection element protection route.
The logical design of the protective device as shown in figure 4, include initiating element, the unit comprising anti-Distance Protection Algorithm,
Unit comprising active Sudden Changing Rate differential algorithm puts into after initiating element movement, wraps with transmitting/collecting mail module, two kinds of units
, can be at once to opposite end sending action information if the unit containing anti-Distance Protection Algorithm also detects that failure and acts, and receive
The action message that the anti-Distance Protection Components in opposite end are sent waits and just confirms that failure generation is errorless after receiving opposite end action message, from
And anti-Distance Protection Components protection exit is made to trip；Unit comprising active Sudden Changing Rate differential algorithm starts and detects failure
Afterwards, then it directly exported can trip.By respectively installing a deficient range combinations formula protective relaying device at the both ends of transmission line of electricity, two
Platform device configures identical deficient range combinations formula relay protective scheme, thus completely protection transmission line of electricity.
Said units be with corresponding software treatment progress or program the step of realizing combined type guard method of the present invention,
The deficient range combinations formula protective device of half-wave power transmission route is to indicate to realize that the deficient range combinations formula of half-wave power transmission route is protected
Therefore the software function framework of maintaining method is no longer specifically introduced the process of the progress breakdown judge of the device.
Specific embodiment is presented above, but the present invention is not limited to described embodiment.Base of the invention
This thinking is above-mentioned basic scheme, and for those of ordinary skill in the art, various changes are designed in introduction according to the present invention
The model of shape, formula, parameter do not need to spend creative work.It is right without departing from the principles and spirit of the present invention
The change, modification, replacement and modification that embodiment carries out are still fallen in protection scope of the present invention.
Claims (4)
1. a kind of deficient range combinations formula guard method of half-wave power transmission route characterized by comprising
The step of by anti-distance protection method protection circuit middle section: impedance magnitude is calculated in acquisition route single ended voltage electric current,
According to the relationship of impedance magnitude and the first setting value, judge whether route breaks down, by adjusting the size of the first setting value,
Make the middle section of anti-Distance Protection Components protection circuit；
The step of by active Sudden Changing Rate differential protection method protection circuit both ends: the difference of phase currents at acquisition route both ends, root
According to the modulus value of the difference of the Sudden Changing Rate at both ends and the relationship of the second setting value, judge whether route breaks down, by adjusting the
The size of two setting values makes the both ends of active Sudden Changing Rate differential protection element protection route；
When route breaks down, active Sudden Changing Rate differential protection method judges the foundation of failure are as follows:
Wherein, IsetFor protection act definite value namely the second setting value, K is the restraint coefficient of stalling current,For movement electricity
Stream,Stalling current,The difference of phase currents at route both ends；According to the modulus value of the difference of the Sudden Changing Rate at both ends
With the relationship of the second setting value, judge whether route breaks down；The time that route both ends perceive failure is obtained, both ends are passed through
The time for perceiving failure relatively determines the specific location that failure may occur, and then actively adjusts the braking system of stalling current
Number identifies failure；The size for adjusting the second setting value makes the both ends of active Sudden Changing Rate differential protection element protection route.
2. a kind of deficient range combinations formula guard method of half-wave power transmission route according to claim 1, which is characterized in that
When route breaks down, anti-distance protection method judges the foundation of failure are as follows:
Wherein, ZfFor the impedance magnitude that anti-Furthest Neighbor is calculated,For the voltage of acquisition,For the electric current of acquisition, ZsetFor
First definite value；When the impedance magnitude being calculated is greater than the first setting value, it is judged as line failure, by adjusting first
The size of setting value makes anti-Distance Protection Components protection circuit middle section.
3. a kind of deficient range combinations formula protective device of half-wave power transmission route characterized by comprising
By the unit in anti-distance protection method protection circuit middle section, modulus of impedance is calculated by acquiring route single ended voltage electric current
Value, according to the relationship of impedance magnitude and the first setting value, judges whether route breaks down, by adjusting the big of the first setting value
It is small, make the middle section of anti-Distance Protection Components protection circuit；
By the unit at active Sudden Changing Rate differential protection method protection circuit both ends, the phase current by acquiring route both ends is mutated
Amount, according to the relationship of the modulus value of the difference of the Sudden Changing Rate at both ends and the second setting value, judges whether route breaks down, passes through tune
The size of whole second setting value makes the both ends of active Sudden Changing Rate differential protection element protection route；
When route breaks down, the foundation of the unit judges failure of failure is judged by active Sudden Changing Rate differential protection method are as follows:
Wherein, IsetFor protection act definite value namely the second setting value, K is the restraint coefficient of stalling current,For movement electricity
Stream,Stalling current,The difference of phase currents at route both ends；According to the modulus value of the difference of the Sudden Changing Rate at both ends
With the relationship of the second setting value, judge whether route breaks down；The time that route both ends perceive failure is obtained, both ends are passed through
The time for perceiving failure relatively determines the specific location that failure may occur, and then actively adjusts the braking system of stalling current
Number identifies failure；The size for adjusting the second setting value makes the both ends of active Sudden Changing Rate differential protection element protection route.
4. a kind of deficient range combinations formula protective device of half-wave power transmission route according to claim 3, which is characterized in that
When route breaks down, the foundation of the unit judges failure of failure is judged by anti-distance protection method are as follows:
Wherein, ZfFor the impedance magnitude that anti-Furthest Neighbor is calculated,For the voltage of acquisition,For the electric current of acquisition, ZsetFor
First definite value；When the impedance magnitude being calculated is greater than the first setting value, it is judged as line failure, by adjusting first
The size of setting value makes anti-Distance Protection Components protection circuit middle section.
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| CN107994550B (en) * | 2017-11-08 | 2022-06-21 | 中国电力科学研究院有限公司 | Coordination method and system for current collection line protection and fan box transformer fuse |
| CN110535106B (en) * | 2019-09-10 | 2021-10-22 | 许昌许继软件技术有限公司 | Fault protection method and device, detection method and device for transformer substation and power transmission line |
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