CN105356427B - The pilot zero sequence direction relay method of common-tower double-return transmission lines in parallel - Google Patents
The pilot zero sequence direction relay method of common-tower double-return transmission lines in parallel Download PDFInfo
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- CN105356427B CN105356427B CN201510756660.7A CN201510756660A CN105356427B CN 105356427 B CN105356427 B CN 105356427B CN 201510756660 A CN201510756660 A CN 201510756660A CN 105356427 B CN105356427 B CN 105356427B
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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
- H02H7/261—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 involving signal transmission between at least two stations
- H02H7/262—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 involving signal transmission between at least two stations involving transmissions of switching or blocking orders
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Abstract
The present invention relates to technical field of relay protection, and in particular to a kind of pilot zero sequence direction relay method of common-tower double-return transmission lines in parallel, including：It breaks down on transmission line of electricity, acquires the electrical quantity at the both ends of the transmission line of electricity；Judge whether one end of transmission line of electricity has negative-sequence current；If so, judging whether the zero sequence direction of described one end of transmission line of electricity is positive；If so, judging whether the zero sequence direction at the both ends of the transmission line of electricity is all positive；If so, judgement failure is troubles inside the sample space, pilot zero sequence direction relay action；Otherwise; judge that failure is external area error; pilot zero sequence direction relay is failure to actuate; by using different zero sequence direction judgment methods to fault type different on transmission line of electricity; the accuracy for improving zero-sequence pilot relay protection solves in common-tower double-return transmission lines in parallel, and a transmission line of electricity breaks down; the problem of zero-sequence pilot relay protection malfunction on another non-fault line, improve reliability and the safety of transmission line of electricity.
Description
Technical field
The present invention relates to technical field of relay protection, and in particular to a kind of vertical zero sequence of common-tower double-return transmission lines in parallel
Direction protection method.
Background technology
For China's supergrid, the main main protection for configuring pilot protection as transmission line of electricity, pilot protection packet
Include longitudinal differential protection, longitudinal distance protection, pilot zero sequence direction relay.Throwing is built up with China Three Gorges hydraulic and electric engineering engineering
Production, transferring electricity from the west to the east, north and south supply mutually power grid pattern gradually form, in the construction of China's extra high voltage network, common-tower double-return
Transmission lines in parallel is widely used.Due to various reasons, the vertical zero sequence side of same tower double back transmission line non-faulting side
To protection misoperation, cause the accident occurred more and more, therefore, the mechanism of analysis circuit pilot zero sequence direction relay malfunction,
The method for avoiding the pilot zero sequence direction relay malfunction of non-fault line is studied to have great importance.The side that the prior art uses
Method is：（1）Existing method thinks, leads to parallel double back transmission line, the pilot zero sequence direction relay malfunction of non-faulting side
Reason is due in the case of the strong magnetic of light current, when earth fault occurs for side, caused by the influence of mutual inductance effect.It is existing vertical
Zero-sequence voltage injection method is mainly based upon above-mentioned reason to avoid the false protection of non-faulting side.（2）Current research discovery,
Parallel double back transmission line, disconnection fault occurs for side, on non-fault line, the residual voltage zero crossing of appearance, and cause
An important factor for pilot zero sequence direction relay malfunction of non-fault line, existing method fail to consider above-mentioned reason, so as to cause
The pilot zero sequence direction relay malfunction of common-tower double-return transmission lines in parallel non-faulting side.
Invention content
It is an object of the invention to propose a kind of pilot zero sequence direction relay method of common-tower double-return transmission lines in parallel, lead to
It crosses and different zero sequence direction judgment methods is used to fault type different on transmission line of electricity, improve the standard of zero-sequence pilot relay protection
True property, solves in common-tower double-return transmission lines in parallel, and a transmission line of electricity breaks down, vertical on another non-fault line
The problem of joining zero-sequenceprotection malfunction, improve reliability and the safety of transmission line of electricity.
For this purpose, the present invention uses following technical scheme：
As one aspect of the present invention, a kind of pilot zero sequence direction relay of the common-tower double-return transmission lines in parallel provided
Method, including：
It breaks down on transmission line of electricity, acquires the electrical quantity at the both ends of the transmission line of electricity；
Judge whether one end of transmission line of electricity has negative-sequence current；
If so, judging whether the zero sequence direction of described one end of transmission line of electricity is positive；
If so, judging whether the zero sequence direction at the both ends of the transmission line of electricity is all positive；
If so, judging the failure for troubles inside the sample space, pilot zero sequence direction relay acts；
Otherwise, it is determined that the failure is external area error, pilot zero sequence direction relay is failure to actuate.
Preferably, whether the zero sequence direction of described described one end for judging transmission line of electricity is that forward direction includes：
Judge whether the electrical quantity of described one end of collected transmission line of electricity meets the main criterion formula of zero sequence direction, it is described
The main criterion formula of zero sequence direction is：And, wherein U0For：The institute of transmission line of electricity
State the residual voltage of one end, I0For：The zero-sequence current of described one end of transmission line of electricity, Z0LFor：The zero sequence impedance of transmission line of electricity, word
Female A is the unit ampere of electric current；
Judge whether the electrical quantity of described one end of collected transmission line of electricity meets negative phase-sequence assistant criteria formula, it is described negative
Sequence assistant criteria formula is：And, wherein U2For：Transmission of electricity
The negative sequence voltage of described one end of circuit, I2For：The negative-sequence current of described one end of transmission line of electricity, Z2LFor：Transmission line of electricity is born
Sequence impedance, Uset are：The negative sequence voltage of the protective device of described one end of transmission line of electricity adjusts definite value；
If the collected electrical quantity meets the main criterion formula of zero sequence direction and negative phase-sequence assistant criteria formula simultaneously, sentence
The zero sequence direction of described one end of the fixed transmission line of electricity is forward direction.
Preferably, whether the zero sequence direction at the both ends for judging the transmission line of electricity is all that forward direction includes：
The other end of the transmission line of electricity is judged according to the main criterion formula of the zero sequence direction and negative phase-sequence assistant criteria formula
Zero sequence direction whether be positive.
Preferably, whether described one end for judging transmission line of electricity has the negative-sequence current to be specially：
According to formulaTo judge whether one end of transmission line of electricity has negative-sequence current, wherein IsetFor transmission line of electricity
The negative-sequence current of protective device of described one end adjust definite value, if formulaIt sets up, then judges the described of transmission line of electricity
One end non-negative sequence current, otherwise, it is determined that there is negative-sequence current in described one end of transmission line of electricity.
Preferably, after whether described one end for judging transmission line of electricity has negative-sequence current, judge the two of the transmission line of electricity
Whether the zero sequence direction at end is all that forward direction further includes before：
If one end non-negative sequence current of transmission line of electricity, judge whether described one end of transmission line of electricity has negative phase-sequence electric
Pressure；
If so, the zero sequence direction of described one end of judgement transmission line of electricity is forward direction；
Otherwise, then judge the zero sequence direction of described one end of transmission line of electricity for negative sense.
Preferably, described to judge whether described one end of transmission line of electricity has the negative sequence voltage to be specially：
According to formulaJudge whether described one end of transmission line of electricity has negative sequence voltage, if formula
It sets up, then judges described one end of transmission line of electricity without negative sequence voltage, otherwise, it is determined that described one end of transmission line of electricity has negative phase-sequence electric
Pressure.
Preferably, whether the zero sequence direction at the both ends for judging the transmission line of electricity is all that forward direction includes：
If the other end non-negative sequence current of transmission line of electricity, judges whether the other end of transmission line of electricity has negative phase-sequence
Voltage；
If so, the zero sequence direction of the other end of judgement transmission line of electricity is forward direction；
Otherwise, then judge the zero sequence direction of the other end of transmission line of electricity for negative sense.
Preferably, the electrical quantity at the both ends of the acquisition transmission line of electricity is specially：
The electrical quantity at the both ends of the transmission line of electricity is acquired by two protective devices at transmission line of electricity both ends.
Preferably, the protective device judges the zero sequence direction of local terminal according to collected electrical quantity respectively, and by logical
The judging result of local terminal zero sequence direction is sent to the protective device of the other end by the mode of letter.
Beneficial effects of the present invention are：A kind of pilot zero sequence direction relay method of common-tower double-return transmission lines in parallel, packet
It includes：It breaks down on transmission line of electricity, acquires the electrical quantity at the both ends of the transmission line of electricity；Judge whether one end of transmission line of electricity has
Negative-sequence current；If so, judging whether the zero sequence direction of described one end of transmission line of electricity is positive；If so, judging the transmission of electricity
Whether the zero sequence direction at the both ends of circuit is all positive；If so, judging the failure for troubles inside the sample space, indulges connection zero sequence direction and protect
Shield acts；Otherwise, it is determined that the failure is external area error, pilot zero sequence direction relay is failure to actuate, by transmission line of electricity not
Same fault type uses different zero sequence direction judgment methods, improves the accuracy of zero-sequence pilot relay protection, solves same tower
In double back transmission lines in parallel, a transmission line of electricity breaks down, the zero-sequence pilot relay protection malfunction on another non-fault line
The problem of, improve reliability and the safety of transmission line of electricity.
Description of the drawings
Fig. 1 is a kind of pilot zero sequence direction relay method of common-tower double-return transmission lines in parallel provided in an embodiment of the present invention
Flow chart；
Fig. 2 is common-tower double-return transmission lines in parallel schematic diagram provided in an embodiment of the present invention；
Fig. 3 is non-fault line zero sequence electricity in common-tower double-return transmission lines in parallel disconnection fault provided in an embodiment of the present invention
Press distribution map.
Specific implementation mode
With reference to Fig. 1-Fig. 3 and the technical solution that is further illustrated the present invention by specific implementation mode.
Fig. 1 is a kind of pilot zero sequence direction relay method of common-tower double-return transmission lines in parallel provided in an embodiment of the present invention
Flow chart.
A kind of pilot zero sequence direction relay method of common-tower double-return transmission lines in parallel, including：
It breaks down on S10, transmission line of electricity, acquires the electrical quantity at the both ends of the transmission line of electricity；
S20, judge whether one end of transmission line of electricity has negative-sequence current；
S30, if so, judging whether the zero sequence direction of described one end of transmission line of electricity is positive；
S40, if so, judging whether the zero sequence direction at the both ends of the transmission line of electricity is all positive；
S50, if so, judge the failure for troubles inside the sample space, pilot zero sequence direction relay action；
S60, otherwise, it is determined that the failure is external area error, pilot zero sequence direction relay is failure to actuate.
In the present embodiment, by using different zero sequence direction judgement sides to fault type different on transmission line of electricity
Method improves the accuracy of zero-sequence pilot relay protection, solves in common-tower double-return transmission lines in parallel, and event occurs for a transmission line of electricity
The problem of barrier, zero-sequence pilot relay protection malfunction on another non-fault line, improve reliability and the safety of transmission line of electricity.
In the present embodiment, common-tower double-return transmission lines in parallel is illustrated, as shown in Fig. 2, the sides M substation and the sides N substation
Between, transmission of electricity transmission is carried out by transmission line of electricity 1 and transmission line of electricity 2, A points install M side line line protection devices, protect transmission line of electricity
1, B point installs N side line line protection devices, same to protect transmission line of electricity 1, the power transmission line range of A points to B points, for protective device
Protection domain.Since transmission line of electricity 1 and transmission line of electricity 2 are typically mounted on above same seat steel tower, and transmission line of electricity 1 and power transmission line
Road 2 belongs to two different circuits, so the transmission line of electricity that Fig. 1 is illustrated, referred to as common-tower double-return transmission lines in parallel.
The method of the present invention is a kind of circuit longitudinal zero-sequence voltage injection, and basic concepts are defined in power industry,
It is described as follows：
（1）Vertical and horizontal：It is seen as longitudinal direction from transmission line of electricity one end toward the other end, longitudinal orthogonal direction is laterally.It is vertical
Connection, refers to that the both ends of transmission line of electricity contact.Rely on vertical connection information（Such as：Command information, analog information）The protection of composition
Referred to as pilot protection.
（2）Zero sequence and negative phase-sequence respectively refer to the zero sequence and negative sequence component of electrical quantity, by unbalanced fault occurs in transmission line of electricity
Cause to generate.
（3）Zero sequence electrical quantity in transmission line of electricity includes residual voltage and zero-sequence current.
（4）Negative phase-sequence electrical quantity in transmission line of electricity includes negative sequence voltage and negative-sequence current.
（5）The direction of zero-sequence current provides that it is forward direction that busbar, which flows to circuit, and it is negative sense that circuit, which flows to busbar,.
（6）The direction of negative-sequence current provides that it is forward direction that busbar, which flows to circuit, and it is negative sense that circuit, which flows to busbar,.
（7）The direction of residual voltage provides that the voltage of circuit, to be positive, is negative sense less than the earth higher than the earth.
（8）The direction of negative sequence voltage provides that the voltage of circuit, to be positive, is negative sense less than the earth higher than the earth.
（9）Troubles inside the sample space and external area error, the failure being happened in protective device protection domain, referred to as troubles inside the sample space, example
Such as the failure that C points occur in Fig. 2；The failure being happened at other than protective device protection domain, referred to as external area error, such as Fig. 2
The failure that middle D points and E points occur.
In the present embodiment, for the breakdown judge of transmission line of electricity, if the transmission line of electricity both ends zero sequence direction judged, both ends
It is forward direction, is shown to be troubles inside the sample space, protection act；If the zero sequence direction at the transmission line of electricity both ends judged, is all negative sense, or
One end is positive, and one end negative sense is shown to be external area error, and protection is failure to actuate.
In the present embodiment, the step S30 includes：
Judge whether the electrical quantity of described one end of collected transmission line of electricity meets the main criterion formula of zero sequence direction, it is described
The main criterion formula of zero sequence direction is：And, wherein U0For：Transmission line of electricity
The residual voltage of described one end, I0For：The zero-sequence current of described one end of transmission line of electricity, Z0LFor：The zero sequence impedance of transmission line of electricity,
Alphabetical A is the unit ampere of electric current；
Wherein, the main criterion formula of zero sequence direction includes two formula, the two formula are the relationships of logical AND；
Judge whether the electrical quantity of described one end of collected transmission line of electricity meets negative phase-sequence assistant criteria formula, it is described negative
Sequence assistant criteria formula is：And, wherein U2For：It is defeated
The negative sequence voltage of described one end of electric line, I2For：The negative-sequence current of described one end of transmission line of electricity, Z2LFor：Transmission line of electricity
Negative sequence impedance, Uset are：The negative sequence voltage of the protective device of described one end of transmission line of electricity adjusts definite value；
Wherein, the main criterion formula of zero sequence direction includes two formula, the two formula are the relationships of logical AND；
If the collected electrical quantity meets the main criterion formula of zero sequence direction and negative phase-sequence assistant criteria formula simultaneously, sentence
The zero sequence direction of described one end of the fixed transmission line of electricity is forward direction.
In the present embodiment, U2、I2、U0、I0And Z0LIt is all the collected electrical quantity of protective device, Uset is：Transmission line of electricity
The negative sequence voltage of protective device of described one end adjust definite value, setting is adjusted by transmission line of electricity operations staff on the protection device
It obtains.
In the present embodiment, a kind of vertical zero sequence direction method of discrimination unlike the prior art, including zero sequence are provided
The main criterion in direction and negative sequence direction assistant criteria, two kinds of criterions be combined with each other, that is, in the case of considering the strong magnetic of light current, double back is parallel defeated
When earth fault occurs for one transmission line of electricity of electric line, mutual inductance effect is to cause the zero-sequence pilot relay protection malfunction of non-fault line
Reason, in addition to this, it is also contemplated that disconnection fault, non-fault line occur for transmission line of electricity of double back transmission lines in parallel
On, there is the case where residual voltage zero crossing, effectively prevents the zero-sequence pilot relay protection malfunction of non-fault line.
As shown in figure 3, for non-fault line zero sequence electricity in common-tower double-return transmission lines in parallel disconnection fault in the present embodiment
Distribution map is pressed, there are zero crossings, traditional zero sequence direction method of discrimination to ignore the zero passage for residual voltage on non-fault line
Point leads to the both sides residual voltage overcompensation of parallel double circuit transmission line, pilot zero sequence direction relay is caused to malfunction.
In the present embodiment, the step S40 includes：
The other end of the transmission line of electricity is judged according to the main criterion formula of the zero sequence direction and negative phase-sequence assistant criteria formula
Zero sequence direction whether be positive.
In the present embodiment, the step S20 is specially：
According to formulaTo judge whether one end of transmission line of electricity has negative-sequence current, wherein IsetFor transmission line of electricity
The negative-sequence current of the protective device of described one end adjusts definite value, is adjusted and is arranged on the protection device by transmission line of electricity operations staff
It arrives, if formulaIt sets up, then one end non-negative sequence current of transmission line of electricity is judged, otherwise, it is determined that the institute of transmission line of electricity
Stating one end has negative-sequence current.
As shown in Figure 1, in the present embodiment, after the step S20, further including before step S40：
If one end non-negative sequence current of S31, transmission line of electricity, judges whether described one end of transmission line of electricity has negative phase-sequence
Voltage；
If so, the zero sequence direction of described one end of judgement transmission line of electricity is forward direction, and S40 is entered step, further sentenced
Whether the zero sequence direction of the other end of the disconnected transmission line of electricity is positive；
Otherwise, then judge the zero sequence direction of described one end of transmission line of electricity for negative sense.
In the present embodiment, the step S31 is specially：
According to formulaJudge whether described one end of transmission line of electricity has negative sequence voltage, if formulaAt
It is vertical, then described one end of transmission line of electricity is judged without negative sequence voltage, otherwise, it is determined that there is negative sequence voltage in described one end of transmission line of electricity.
In the present embodiment, the step S40 includes：
If the other end non-negative sequence current of transmission line of electricity, judges whether the other end of transmission line of electricity has negative phase-sequence
Voltage；
If so, the zero sequence direction of the other end of judgement transmission line of electricity is forward direction；
Otherwise, then judge the zero sequence direction of the other end of transmission line of electricity for negative sense.
In the present embodiment, the zero sequence direction at transmission line of electricity both ends is sentenced by the protective device at transmission line of electricity both ends respectively
It is disconnected, flow is judged all as shown in Figure 1, it is first determined whether having negative-sequence current, if so, then public according to the main criterion of the zero sequence direction
Formula and negative phase-sequence assistant criteria formula judge the zero sequence direction at the end；If being judged using another determination method without negative-sequence current
Whether there is negative sequence voltage, if not having, judges the zero sequence direction at the end for negative sense, need not judge the zero sequence side of the other end again
To it is external area error directly to regard as the failure, and pilot zero sequence direction relay is failure to actuate；If there is negative sequence voltage, the end is judged
Zero sequence direction be forward direction, continue the zero sequence direction for judging the other end, and first judge whether the other end has negative-sequence current, flow
Ibid, it does not repeat hereby, when the zero sequence direction at both ends is all forward direction, pilot zero sequence direction relay just acts.
In the present embodiment, the electrical quantity at the both ends of the acquisition transmission line of electricity is specially：
The electrical quantity at the both ends of the transmission line of electricity is acquired by two protective devices at transmission line of electricity both ends.
In the present embodiment, the protective device judges the zero sequence direction of local terminal according to collected electrical quantity respectively, and
The judging result of local terminal zero sequence direction is sent to the protective device of the other end by way of communication, therefore, the guarantor per one end
Protection unit can know the zero sequence direction of local terminal and the other end, and judge whether pilot zero sequence direction relay needs to move accordingly
Make.
The foregoing is merely the specific implementation modes of the present invention, and the description is merely to explain the principles of the invention, and
It cannot be construed to limiting the scope of the invention in any way.Based on the explanation herein, those skilled in the art is not
Other specific implementation methods of the present invention can be associated by needing to pay performing creative labour, these modes fall within the present invention
Protection domain within.
Claims (8)
1. a kind of pilot zero sequence direction relay method of common-tower double-return transmission lines in parallel, which is characterized in that including：
It breaks down on transmission line of electricity, acquires the electrical quantity at the both ends of the transmission line of electricity；
Judge whether one end of transmission line of electricity has negative-sequence current；
If so, judging whether the zero sequence direction of described one end of transmission line of electricity is positive；
If so, judging whether the zero sequence direction at the both ends of the transmission line of electricity is all positive；
If so, judging the failure for troubles inside the sample space, pilot zero sequence direction relay acts；
Otherwise, it is determined that the failure is external area error, pilot zero sequence direction relay is failure to actuate；
Wherein, whether the zero sequence direction of described described one end for judging transmission line of electricity is that forward direction includes：
Judge whether the electrical quantity of described one end of collected transmission line of electricity meets the main criterion formula of zero sequence direction, the zero sequence
The main criterion formula in direction is：|3U0-3I0*Z0L| ＞ | 3U0+3I0*Z0L/ 3 | and | 3I0| ＞ 300A, wherein U0For：Transmission line of electricity
Described one end residual voltage, I0For：The zero-sequence current of described one end of transmission line of electricity, Z0LFor：The zero sequence of transmission line of electricity hinders
Anti-, alphabetical A is the unit ampere of electric current；
Judge whether the electrical quantity of described one end of collected transmission line of electricity meets negative phase-sequence assistant criteria formula, the negative phase-sequence is auxiliary
The criterion formula is helped to be：|3U2-3I2*Z2L| ＞ | 3U2+3I2*Z2L/ 3 | and | 3U2-3I2*Z2L| ＞ Uset, wherein U2For：Power transmission line
The negative sequence voltage of the one end on road, I2For：The negative-sequence current of described one end of transmission line of electricity, Z2LFor：The negative phase-sequence of transmission line of electricity
Impedance, Uset are：The negative sequence voltage of the protective device of described one end of transmission line of electricity adjusts definite value；
If the collected electrical quantity meets the main criterion formula of zero sequence direction and negative phase-sequence assistant criteria formula simultaneously, institute is judged
The zero sequence direction for stating described one end of transmission line of electricity is forward direction.
2. a kind of pilot zero sequence direction relay method of common-tower double-return transmission lines in parallel according to claim 1, special
Sign is whether the zero sequence direction at the both ends for judging the transmission line of electricity is all that forward direction includes：
The zero of the other end of the transmission line of electricity is judged according to the main criterion formula of the zero sequence direction and negative phase-sequence assistant criteria formula
Whether sequence direction is positive.
3. a kind of pilot zero sequence direction relay method of common-tower double-return transmission lines in parallel according to claim 1, special
Sign is, whether described one end for judging transmission line of electricity has the negative-sequence current to be specially：
According to formula | 3I2| ＜ IsetTo judge whether one end of transmission line of electricity has negative-sequence current, wherein Iset is transmission line of electricity
The negative-sequence current of the protective device of described one end adjusts definite value, if formula | 3I2| ＜ IsetIt sets up, then judges the institute of transmission line of electricity
One end non-negative sequence current is stated, otherwise, it is determined that there is negative-sequence current in described one end of transmission line of electricity.
4. a kind of pilot zero sequence direction relay method of common-tower double-return transmission lines in parallel according to claim 3, special
Sign is, after whether described one end for judging transmission line of electricity has negative-sequence current, judges the zero sequence at the both ends of the transmission line of electricity
Whether direction further includes before being all forward direction：
If one end non-negative sequence current of transmission line of electricity, judges whether described one end of transmission line of electricity has negative sequence voltage；
If so, the zero sequence direction of described one end of judgement transmission line of electricity is forward direction；
Otherwise, then judge the zero sequence direction of described one end of transmission line of electricity for negative sense.
5. a kind of pilot zero sequence direction relay method of common-tower double-return transmission lines in parallel according to claim 4, special
Sign is, described to judge whether described one end of transmission line of electricity has the negative sequence voltage to be specially：
According to formula | 3U2| ＜ UsetJudge whether described one end of transmission line of electricity has negative sequence voltage, if formula | 3U2| ＜ Uset
It sets up, then judges described one end of transmission line of electricity without negative sequence voltage, otherwise, it is determined that described one end of transmission line of electricity has negative phase-sequence electric
Pressure.
6. a kind of pilot zero sequence direction relay method of common-tower double-return transmission lines in parallel according to claim 5, special
Sign is whether the zero sequence direction at the both ends for judging the transmission line of electricity is all that forward direction includes：
If the other end non-negative sequence current of transmission line of electricity, judge whether the other end of transmission line of electricity has negative sequence voltage；
If so, the zero sequence direction of the other end of judgement transmission line of electricity is forward direction；
Otherwise, then judge the zero sequence direction of the other end of transmission line of electricity for negative sense.
7. a kind of pilot zero sequence direction relay method of common-tower double-return transmission lines in parallel according to claim 1, special
Sign is that the electrical quantity at the both ends of the acquisition transmission line of electricity is specially：
The electrical quantity at the both ends of the transmission line of electricity is acquired by two protective devices at transmission line of electricity both ends.
8. a kind of pilot zero sequence direction relay method of common-tower double-return transmission lines in parallel according to claim 7, special
Sign is that the protective device judges the zero sequence direction of local terminal according to collected electrical quantity respectively, and by way of communication
The judging result of local terminal zero sequence direction is sent to the protective device of the other end.
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| CN106253244B (en) * | 2016-08-10 | 2018-08-07 | 三峡大学 | It is a kind of based on electric current from the current direction longitudinal protection method of structure reference quantity |
| CN106353641B (en) * | 2016-09-13 | 2018-10-09 | 国电南瑞科技股份有限公司 | Method of discrimination based on multiple-circuit on same tower area internal and external fault |
| CN107947129B (en) * | 2016-10-12 | 2020-01-17 | 国网西藏电力有限公司 | Zero sequence protection method |
| CN106602530B (en) * | 2016-12-30 | 2021-12-03 | 中国电力科学研究院 | Misoperation prevention method and system for same-tower double-circuit zero-sequence longitudinal protection |
| CN109301799B (en) * | 2018-10-12 | 2022-07-01 | 中国电力科学研究院有限公司 | Method and system for preventing multiple-circuit longitudinal zero-sequence direction protection maloperation in same tower |
| CN111025080B (en) * | 2019-10-12 | 2022-11-15 | 中国电力科学研究院有限公司 | Method and system for determining fault line based on station domain information |
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