CN111200278A - High-speed grounding switch anti-tripping protection method in direct-current system metal loop operation mode - Google Patents
High-speed grounding switch anti-tripping protection method in direct-current system metal loop operation mode Download PDFInfo
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- CN111200278A CN111200278A CN202010112273.0A CN202010112273A CN111200278A CN 111200278 A CN111200278 A CN 111200278A CN 202010112273 A CN202010112273 A CN 202010112273A CN 111200278 A CN111200278 A CN 111200278A
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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
- H02H7/268—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 for dc systems
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0092—Details of emergency protective circuit arrangements concerning the data processing means, e.g. expert systems, neural networks
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Abstract
The invention discloses a high-speed grounding switch stealing trip protection method in a direct-current system metal loop operation mode, which comprises the steps of detecting that an HSGS (high speed global system for mobile communications) branch signal is effective; detecting whether an instruction for converting a metal loop running mode into a ground loop running mode is received by the high-voltage direct-current system; if yes, locking and protecting the stealing trip; if not, detecting whether the operation mode of the metal return wire of the high-voltage direct-current system after time delay processing is invalid; if yes, locking and protecting the stealing trip; if not, the protection operation is performed, and the high-speed grounding switch HSGS is overlapped. The method and the device can accurately identify the high-speed grounding switch HSGS stealing and tripping in the metal loop operation mode of the high-voltage direct-current system and can reliably act to immediately coincide with the HSGS, quickly recover the ground potential clamping point of the converter station, avoid forced direct current shutdown caused by loss of the ground potential clamping point in the metal loop operation mode of the extra-high voltage/high-voltage direct-current system, and improve the operation reliability and the operation stability of the extra-high voltage/high-voltage direct-current system.
Description
Technical Field
The invention relates to the technical field of direct current protection of an extra-high/high-voltage direct current transmission system, in particular to a high-speed grounding switch anti-tripping protection method in a direct current system metal loop operation mode.
Background
The ultra-high voltage/high voltage direct current transmission is a transmission mode that three-phase alternating current is rectified into direct current through a converter station and then is transmitted to another converter station through a direct current transmission line to be inverted into three-phase alternating current. Under a special operation mode or an abnormal operation condition, a direct current transmission system can cause larger direct current to flow into the ground, so that technical problems of metal pipeline corrosion, current conversion variable direct current magnetic biasing, CT saturation and the like can be caused, and adverse effects can be caused on the safe and stable operation of a power grid at a transmitting end and a receiving end.
The metal return operation mode is a common operation mode of an extra-high voltage/high voltage direct current transmission system. In order to avoid a continuous excessive current in the ground, when one pole in bipolar operation is out of operation, the rest poles can use an uncharged counter-pole line as a current return path, and the connection mode is called a metal loop mode. The conversion between the earth return line and the metal return line can be carried out in two states of direct current pole operation or non-operation. If the antipode of the metal return wire is not isolated, antipode isolation operation should be performed first, and after antipode isolation, the electrode can enter the metal return wire state correctly.
When the extra-high voltage/high voltage direct current transmission system adopts a metal return operation mode, an in-station grounding mode is generally adopted, namely, the high-speed grounding switch HSGS is used for grounding, and a ground potential clamping point of the extra-high voltage/high voltage direct current transmission system is set. For a two-end direct current system, a receiving terminal high-speed grounding switch HSGS is generally adopted for grounding to clamp the ground potential. For a multi-terminal direct current system, a sending terminal station high-speed grounding switch HSGS may be grounded for ground potential clamping, for example, when a metal loop operation mode is adopted in a kunlilong direct current project in practical application, the kunbei station high-speed grounding switch HSGS is grounded for potential clamping. When the high-voltage direct-current system adopts a metal return line operation mode, if the high-speed grounding switch HSGS cannot be quickly superposed within a certain time after being stolen, the high-voltage direct-current system loses a ground potential clamping point, and the neutral bus voltage UDN of the converter station gradually rises to cause the action of the grounding electrode overvoltage protection 59EL, so that the direct-current system is stopped.
In the prior art, an extra-high voltage/high voltage direct current transmission system only has one method for high-speed grounding switch HSGS (high speed switch-high voltage source system) tripping protection, and only aims at high-speed grounding switch protection (82-HSGS) in a ground loop mode. Specifically, in the above method, after the high-speed ground switch HSGS makes a trip, it is necessary to determine the value of the current flowing through the high-speed ground switch HSGS and compare the value with a fixed value to form a protection logic, that is: after the high-speed grounding switch HSGS is judged to be in the opening position, the absolute value of current IdSG flowing through the HSGS is taken as fault characteristic quantity, then the fault characteristic quantity is compared with a fixed value I _ set, and when the fault characteristic quantity is larger than the fixed value and is delayed for a certain time (generally, the time is delayed for about 60 ms), the high-speed grounding switch acts in a protection mode, and the HSGS is immediately superposed. The protection principle formula is as follows: i IdSG | I _ set.
When the high-speed grounding switch HSGS jumps in the metal loop operation mode of the extra-high voltage/high voltage direct current transmission system, the high-speed grounding switch protection (82-HSGS) based on the protection method principle cannot identify the fault working condition, cannot act, cannot realize the jump-in protection of the high-speed grounding switch HSGS in the metal loop operation mode of the extra-high voltage/high voltage direct current transmission system, and further influences the safety and reliability of the direct current transmission system. Therefore, a high-speed grounding switch HSGS tripping protection mode under the metal return operation mode of the extra-high/high-voltage direct-current power transmission system is urgently needed to ensure the safety and reliability of the direct-current power transmission system.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a high-speed grounding switch anti-tripping protection method in a direct-current system metal loop operation mode.
The invention discloses a high-speed grounding switch stealing trip protection method under a direct current system metal return wire operation mode, which comprises the steps of detecting that an HSGS (high speed global system for mobile communications) branch signal is effective;
detecting whether an instruction for converting a metal loop running mode into a ground loop running mode is received by the high-voltage direct-current system; if yes, locking the high-speed grounding switch HSGS in the metal loop operation mode for tripping protection; if not, executing the next step;
detecting whether the operation mode of the metal return wire of the high-voltage direct-current system after time delay processing is invalid; if yes, locking the high-speed grounding switch HSGS in the metal loop operation mode for tripping protection; if not, the protection operation is performed, and the high-speed grounding switch HSGS is overlapped.
According to an embodiment of the present invention, after detecting that the HSGS branch signal is valid, the method further includes the following steps:
detecting whether the grounding station is in a metal loop mode, if so, executing the next step; if not, the locking metal loop operation mode high-speed grounding switch HSGS is protected from stealing and jumping.
According to one embodiment of the invention, the high-speed grounding switch HSGS tap signal is detected to be valid and the T1 delay is valid.
According to an embodiment of the invention, whether an instruction of the high-voltage direct-current system for executing the metal loop operation mode to ground loop operation mode is received or not is detected, and T2 is delayed and invalidated.
According to an embodiment of the invention, whether the operation mode of the metal return wire of the high-voltage direct-current system after time delay processing is invalid or not is detected, and T3 time delay is invalid.
According to one embodiment of the present invention, the size relationship of T1, T2 and T3 is T1 < T3 < T2.
According to an embodiment of the present invention, T1 has a value in the range of 10ms to 20 ms.
According to an embodiment of the present invention, T2 has a value in the range of 60s-120 s.
According to an embodiment of the present invention, T3 has a value in the range of 200ms to 800 ms.
According to an embodiment of the present invention, the high-speed ground switch HSGS stealing trip protection in the locked metallic loop operation mode is: and after the high-speed grounding switch HSGS is detected to be effective in bits, the high-speed grounding switch does not coincide with the low-speed grounding switch.
The method can accurately identify the high-speed grounding switch HSGS stealing and tripping in the metal loop operation mode of the high-voltage direct-current system, can reliably act to immediately coincide the HSGS, quickly recover the ground potential clamping point of the converter station, avoid forced direct current shutdown caused by loss of the ground potential clamping point in the metal loop operation mode of the extra-high voltage/high-voltage direct-current system, and improve the operation reliability and the operation stability of the extra-high voltage/high-voltage direct-current system. Moreover, the invention can be directly implemented by modification and upgrade on the direct current protection system, has low cost and is suitable for popularization and use.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a flowchart of a high-speed grounding switch skip-stealing protection method in a dc system metallic return operation mode according to an embodiment;
fig. 2 is a logic block diagram of a high-speed grounding switch skip-stealing protection method in a dc system metallic return operation mode according to an embodiment;
fig. 3 is a schematic structural diagram of an operation mode of a pole 1 metal loop of the very high/high voltage direct current transmission system according to the second embodiment.
Detailed Description
In the following description, for purposes of explanation, numerous implementation details are set forth in order to provide a thorough understanding of the various embodiments of the present invention. It should be understood, however, that these implementation details are not to be interpreted as limiting the invention. That is, in some embodiments of the invention, such implementation details are not necessary. In addition, some conventional structures and components are shown in simplified schematic form in the drawings.
It should be noted that all the directional indications such as up, down, left, right, front and rear … … in the embodiment of the present invention are only used to explain the relative positional relationship, movement, etc. between the components in a specific posture as shown in the drawings, and if the specific posture is changed, the directional indication is changed accordingly.
In addition, the descriptions related to the first, the second, etc. in the present invention are only used for description purposes, do not particularly refer to an order or sequence, and do not limit the present invention, but only distinguish components or operations described in the same technical terms, and are not understood to indicate or imply relative importance or implicitly indicate the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings:
example one
Referring to fig. 1 and fig. 2, fig. 1 is a flowchart of a method for preventing a high-speed ground switch from stealing and jumping in a metallic return operation mode of a dc system according to a first embodiment, and fig. 2 is a logic block diagram of the method for preventing the high-speed ground switch from stealing and jumping in the metallic return operation mode of the dc system according to the first embodiment. The high-speed grounding switch anti-tripping protection method in the operation mode of the metal return wire of the direct current system in the embodiment comprises the following steps:
and S1, detecting that the HSGS branch signal of the high-speed grounding switch is valid.
S2, detecting whether an instruction for the high-voltage direct-current system to execute a metal return operation mode to a ground return operation mode is received; if yes, locking the high-speed grounding switch HSGS in the metal loop operation mode for tripping protection; if not, executing the next step.
S3, detecting whether the operation mode of the metal return wire of the high-voltage direct-current system after time delay processing is invalid; if yes, locking the high-speed grounding switch HSGS in the metal loop operation mode for tripping protection; if not, the protection operation is performed, and the high-speed grounding switch HSGS is overlapped.
The high-speed grounding switch HSGS stealing tripping protection under the locking metal loop operation mode refers to the following steps: and after the high-speed grounding switch HSGS is detected to be effective in bits, the high-speed grounding switch does not coincide with the low-speed grounding switch.
Through the logic judgment, the high-speed grounding switch HSGS can normally execute the characteristic of the stepping operation only after receiving the instruction of the direct-current system to execute the metal loop operation mode to the ground loop operation mode, so that the shutdown of the direct-current system caused by the stealing trip of the HSGS in the metal loop operation mode of the direct-current transmission system can be effectively avoided, and the safety and reliability of the direct-current transmission system are further ensured. Moreover, the direct current protection system can be directly transformed and upgraded, is low in cost and is suitable for popularization and use. The embodiment specifically protects the skip of the high-speed grounding switch HSGS in the metal return operation mode of the extra-high voltage/high voltage direct current transmission system.
Specifically, in step S1, the detection action in the step of detecting that the high-speed grounding switch HSGS tap signal is valid is detected by the dc protection system. It can be understood that the dc protection system is an existing and indispensable system of the extra-high/high voltage dc transmission system, and can detect and transmit the on-bit signal or the off-bit signal of the high-speed grounding switch HSGS for the dc protection system to receive, determine and make corresponding actions. Therefore, the protection method of the embodiment can directly call the related data of the existing dc protection system, thereby participating in the logic judgment of the sneak trip behavior of the high-speed grounding switch HSGS, and the existing dc protection system is modified, for example, a data extraction command program is added, so that no extra cost is generated. In step S1, if the high-speed grounding switch HSGS is detected to be active, it indicates that the high-speed grounding switch HSGS is already on bit, that is, the following signals are obtained: a high-speed grounding switch HSGS of the extra-high voltage/high-voltage direct-current transmission system has a potential dividing behavior, and a first judgment logic is formed.
Similarly, in step S2, the detecting action in the step of detecting whether the instruction for the hvdc system to execute the metallic loop operation mode to ground loop operation mode is received is also performed by the dc protection system, and details thereof are not repeated herein. It can be understood that after the high-speed grounding switch HSGS is in a separated position, the metal return operation mode of the extra-high voltage/high voltage direct current transmission system is changed to the ground return operation mode, in other words, the action that the metal return operation mode is changed to the ground return operation mode needs the high-speed grounding switch HSGS in a separated position. In the step S2, when the high-voltage dc system executes the instruction of switching the metal loop operation mode to the ground loop operation mode, a corresponding control instruction is generated, and the instruction can divide the high-speed grounding switch HSGS, so that the dc system is pressed to execute the switching of the metal loop operation mode to the ground loop operation mode. That is, if the dc protection system detects the above instruction, it indicates that the high-voltage dc system is in a ground return operation mode that is a metal return operation mode of the high-voltage dc system according to a predetermined plan, and the high-speed ground switch HSGS performs the instruction command normally instead of the sneak trip behavior, and does not need to perform sneak trip protection, and needs to be eliminated, thereby forming a second determination logic. Naturally, after the direct current protection system detects the instruction, the high-speed grounding switch HSGS of the branch position does not need to be superposed, and the stealing trip protection is not carried out.
Similarly, in step S3, the detecting action in the step of detecting whether the operation mode of the metal return line of the high voltage direct current system after the time delay processing is invalid is also performed by the dc protection system, and details are not described here. As is clear from the foregoing, the embodiment specifically protects the tripping of the high-speed grounding switch HSGS in the metallic loop operation mode of the ultra-high voltage/high voltage direct current transmission system, and the tripping protection of the high-speed grounding switch HSGS in the ground loop operation mode already exists in the prior art, and does not need to be considered. Therefore, in the step S3, whether the operation mode of the metal return line of the high-voltage direct-current system after the time delay processing is invalid is detected to determine whether the high-voltage direct-current system is in the operation mode of the metal return line, and if the operation mode of the metal return line of the high-voltage direct-current system is invalid, it indicates that the high-voltage direct-current system is not in the operation mode of the metal return line, the high-speed grounding switch HSGS is not overlapped after being subjected to potential separation, and the method other than the operation mode of the metal return line is not subjected to the; on the contrary, if the metal loop operation mode of the high-voltage direct-current system is effective, the high-voltage direct-current system is in the metal loop operation mode, so that a third judgment logic is formed, the high-speed grounding switch HSGS needs to be protected against stealing and tripping, and the high-speed grounding switch HSGS is immediately superposed by combining the second judgment logic and the first judgment logic, so that the stealing and tripping behavior of the high-speed grounding switch HSGS in the metal loop operation mode of the ultra-high voltage/high-voltage direct-current transmission system is protected, and the safety and reliability of the direct-current transmission system are ensured. The delay processing in this step is to avoid the influence of false operation and ensure the accuracy of the third judgment logic.
Preferably, after step S1, after detecting that the high-speed grounding switch HSGS tap signal is valid, the method further includes the following steps: s4, detecting whether the station is a metal loop type grounding station, if so, executing the next step; if not, the locking metal loop operation mode high-speed grounding switch HSGS is protected from stealing and jumping. That is to say, the three judgment logics are further limited in the metal return line grounding station to ensure the accuracy of the stealing trip protection behavior, and then a fourth judgment logic is formed. Specifically, the fourth judgment logic further defines that after the high-speed grounding switch HSGS is detected to be valid in a branch signal, the tripping protection of the high-speed grounding switch HSGS must occur at the grounding station in the operation mode of the metallic return line of the extra-high voltage/high voltage direct current system, and then the tripping protection is continuously performed downwards, otherwise, the high-speed grounding switch HSGS is not overlapped. Specifically, for a two-end dc system, a receiving-end station high-speed grounding switch HSGS is generally used for grounding to clamp the ground potential, and the grounding station is the receiving-end station and needs to be executed at the receiving-end station. For a multi-terminal direct-current system, a sending terminal high-speed grounding switch HSGS can be adopted for grounding to clamp the ground potential, and the grounding station is the sending terminal and needs to be executed at the sending terminal; for example, when the kunlilon dc engineering in practical implementation adopts a metal loop operation mode, the high-speed ground switch HSGS of the kunbei station is grounded to perform potential clamping. In specific application, the metal return wire grounding station is a soft pressing plate which can be put in and withdrawn, the putting in is 1, the withdrawing is 0, and the putting in and the withdrawing are carried out according to an actual operation mode.
Referring back to fig. 1 and 2, further, in step S1, it is detected that the HSGS tap signal is active and the T1 delay is active. Wherein the value range of T1 is 10ms-20 ms. That is to say, after the delay time of T1 is needed, the dc protection system detects the high-speed ground switch HSGS branch signal again, and then forms the first judgment logic to prevent the high-speed ground switch HSGS position signal, i.e. the on-bit information or the branch information, from being mistakenly output due to protection caused by disturbance, so as to avoid the influence of misoperation, and make the first judgment logic participating in the judgment more accurate.
Similarly, in step S2, it is detected whether a command for the hvdc system to perform the metallic loop operation mode to ground loop operation mode is received and T2 is time-delayed and disabled. Wherein the value range of T2 is 60s-120 s. That is to say, after the dc detection system does not detect the instruction of the high-voltage dc system to change the metal loop operation mode to the ground loop operation mode, and after T2 is delayed, the dc detection system still does not detect the instruction of the high-voltage dc system to change the metal loop operation mode to the ground loop operation mode, so as to form a second judgment logic, thereby avoiding the influence of malfunction, and making the second judgment logic involved in the judgment more accurate.
Similarly, in step S3, it is detected whether the operation mode of the metallic return line of the high voltage dc system after the delay processing is invalid and the delay is invalid at T3. Wherein the value range of T3 is 200ms-800 ms. That is to say, after the dc detection system detects that the operation mode of the metal return wire of the high-voltage dc system after the delay processing is invalid, and after the T3 delay, the operation mode of the metal return wire of the high-voltage dc system after the delay processing is still invalid, a third judgment logic is formed, so as to avoid the influence of malfunction, and make the third judgment logic participating in the judgment more accurate.
Preferably, the size relationship of T1, T2 and T3 is T1 < T3 < T2. T2 is greater than T3 to ensure that the effective time of the switch command is greater than the effective time of the metallic loop operation mode, thereby avoiding the protection of false exits when the metallic loop operation mode is switched to the ground operation mode in the dc system. T3 is greater than T1, and the high-speed grounding switch HSGS is required to be in a bit-off state, or in a brake-off state, for example, the time interval is defined as T4, which is generally 80ms, and T3 is required to be greater than T1 plus T4, so as to ensure the accuracy and sensitivity of the logic judgment.
And finally, after the high-speed grounding switch HSGS receives the reclosing command, closing the high-speed grounding switch after T5 time, wherein T5 is less than 100 ms.
Example two
Referring to fig. 1 and fig. 3 again, fig. 3 is a schematic structural diagram of an operation mode of a pole 1 metallic return wire of an extra-high/high voltage direct current transmission system according to a second embodiment. The high-speed grounding switch anti-tripping protection method in the dc system metallic loop operation mode in the embodiment is different from that in the first embodiment in that: when the high-voltage direct-current system pole 1 metal loop operates, the high-speed grounding switch HSGS (0040) of the sending terminal station jumps, then:
in step S1, 10ms after the high-speed grounding switch HSGS is detected to be active.
In step S4, the detection is a metal loop ground station.
And step S2, detecting that the instruction of the high-voltage direct-current system for executing the metal loop operation mode to the ground loop operation mode is not received.
And step S3, if the operation mode of the metallic return wire of the high-voltage direct-current system is detected to be effective, performing protection action, immediately superposing the high-speed grounding switch HSGS, and immediately closing the HSGS after T5.
It should be noted that, under the above-mentioned operating condition, after the high-speed grounding switch HSGS is tripped, no current passes through the high-speed grounding switch HSGS, so IdSG is zero, and the conventional high-speed grounding switch protection (82-HSGS) will not operate. By applying the method for preventing the high-speed grounding switch from stealing and tripping in the metal loop operation mode of the ultra-high voltage/high voltage direct current transmission system, correct actions for preventing the high-speed grounding switch from stealing and tripping in the HSGS are executed, and the safety and reliability of the ultra-high voltage/high voltage direct current transmission system are ensured.
EXAMPLE III
Referring to fig. 1 to 3 again, the difference between the high-speed grounding switch stealing trip protection method in the dc system metallic loop operation mode in the present embodiment and the first embodiment is that: when the high-voltage direct-current system adopts the pole 1 metal return operation mode, the high-voltage direct-current system executes an instruction of changing the metal return operation mode to the ground return operation mode. Then:
in step S1, it is detected that the high-speed grounding switch HSGS tap signal is valid.
In step S4, the detection is a metal loop ground station.
Step S2, detecting and receiving an instruction of the high-voltage direct-current system for executing the mode of converting the metal loop operation mode into the ground loop operation mode, and locking the high-speed grounding switch HSGS tripping protection 60S in the metal loop operation mode; step S3 is executed after 60S.
And step S3, detecting that the operation mode of the direct current system metallic loop is invalid, locking the high-speed grounding switch HSGS in the operation mode of the metallic loop for tripping protection, and not overlapping the high-speed grounding switch HSGS any more.
Example four
Referring to fig. 1 to 3 again, the difference between the high-speed grounding switch stealing trip protection method in the dc system metallic loop operation mode in the present embodiment and the first embodiment is that: when the high-voltage direct-current system is in a pole 1 metal loop operation mode, the high-speed grounding switch HSGS is subjected to abrupt change within 10 ms. Then:
and step S1, detecting a high-speed grounding switch HSGS potential dividing signal, delaying for 10ms, and then making potential division invalid, and locking the locking metal loop operation mode high-speed grounding switch HSGS stealing tripping protection, and not overlapping the high-speed grounding switch HSGS any more.
To sum up: by providing the high-speed grounding switch HSGS tripping protection method aiming at the metal loop operation mode of the extra-high voltage/high-voltage direct current transmission system, the characteristic that the high-speed grounding switch HSGS can normally execute the switching-off operation only after the high-speed grounding switch HSGS receives the instruction of the direct current system to execute the metal loop operation mode to the ground loop operation mode under the metal loop operation mode of the extra-high voltage/high-voltage direct current transmission system is fully utilized, the high-voltage direct current system can be effectively prevented from being stopped after the HSGS tripping is executed under the metal loop operation mode of the direct current transmission system, and the operation reliability and the operation stability of the extra-high voltage/high-voltage direct current. Moreover, the invention can be directly implemented by modification and upgrade on the direct current protection system, has low cost and is suitable for popularization and use
The above is merely an embodiment of the present invention, and is not intended to limit the present invention. Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (10)
1. A high-speed grounding switch anti-tripping protection method under a direct current system metal loop operation mode is characterized by comprising the following steps:
detecting that the HSGS sub-bit signal of the high-speed grounding switch is valid;
detecting whether an instruction for converting a metal loop running mode into a ground loop running mode is received by the high-voltage direct-current system; if yes, locking the high-speed grounding switch HSGS in the metal loop operation mode for tripping protection; if not, executing the next step;
detecting whether the operation mode of the metal return wire of the high-voltage direct-current system after time delay processing is invalid; if yes, locking the high-speed grounding switch HSGS in the metal loop operation mode for tripping protection; if not, the protection operation is performed, and the high-speed grounding switch HSGS is overlapped.
2. The method for protecting a high-speed grounding switch from stealing and jumping in a metallic loop operating mode of a direct current system according to claim 1, wherein after detecting that a high-speed grounding switch HSGS branch signal is valid, the method further comprises the following steps:
detecting whether the grounding station is in a metal loop mode, if so, executing the next step; if not, the locking metal loop operation mode high-speed grounding switch HSGS is protected from stealing and jumping.
3. The method according to claim 1, wherein the HSGS tap signal is detected to be active and T1 is delayed to be active.
4. The method for protecting the high-speed grounding switch from the stealing trip in the metallic loop operation mode of the DC system according to claim 3, wherein whether a command for the high-voltage DC system to execute the metallic loop operation mode to change the metallic loop operation mode to the grounding loop operation mode is received or not is detected, and T2 is delayed and invalid.
5. The method for protecting the high-speed grounding switch from the stealing trip in the metallic return operation mode of the direct current system according to claim 4, wherein whether the metallic return operation mode of the high-voltage direct current system after the delay processing is invalid or not is detected, and the T3 delay is invalid.
6. The method of claim 5, wherein the size relationship of T1, T2 and T3 is T1 < T3 < T2.
7. The method according to claim 3, wherein the value of T1 ranges from 10ms to 20 ms.
8. The method for protecting the stealing trip of the high-speed grounding switch in the metallic return operation mode of the direct current system according to claim 4, wherein the value range of T2 is 60s-120 s.
9. The method according to claim 5, wherein the value of T3 ranges from 200ms to 800 ms.
10. The method for protecting from stealing trip of a high-speed grounding switch in a metallic loop operating mode of a direct current system according to any one of claims 1 to 9, wherein the protecting from stealing trip of the high-speed grounding switch HSGS in a locked metallic loop operating mode is that: and after the high-speed grounding switch HSGS is detected to be effective in bits, the high-speed grounding switch does not coincide with the low-speed grounding switch.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN112290520A (en) * | 2020-11-13 | 2021-01-29 | 中国南方电网有限责任公司超高压输电公司昆明局 | Grounding fault protection method for metal return line of three-terminal direct-current power transmission system |
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| CN112130063A (en) * | 2020-08-28 | 2020-12-25 | 许继集团有限公司 | Detection and protection method for mechanical switch tripping of hybrid high-voltage direct-current circuit breaker |
| CN112130063B (en) * | 2020-08-28 | 2024-04-12 | 许继集团有限公司 | Detection and protection method for mechanical switch theft jump of hybrid high-voltage direct-current breaker |
| CN112290520A (en) * | 2020-11-13 | 2021-01-29 | 中国南方电网有限责任公司超高压输电公司昆明局 | Grounding fault protection method for metal return line of three-terminal direct-current power transmission system |
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| CN111200278B (en) | 2020-12-01 |
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