CN114050548B - Differential protection method and device in special bypass wiring mode - Google Patents
Differential protection method and device in special bypass wiring mode Download PDFInfo
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- CN114050548B CN114050548B CN202111341876.9A CN202111341876A CN114050548B CN 114050548 B CN114050548 B CN 114050548B CN 202111341876 A CN202111341876 A CN 202111341876A CN 114050548 B CN114050548 B CN 114050548B
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- bypass
- overhauled
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- 238000000034 method Methods 0.000 title claims abstract description 43
- 230000004044 response Effects 0.000 claims description 5
- 230000008569 process Effects 0.000 abstract description 16
- 230000009471 action Effects 0.000 abstract description 15
- 230000008859 change Effects 0.000 abstract description 5
- 230000008439 repair process Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/05—Details with means for increasing reliability, e.g. redundancy arrangements
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
Landscapes
- Emergency Protection Circuit Devices (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention relates to a differential protection method and device under special bypass wiring form, when the method is used for bypass operation, the operation process is protected and identified by throwing relevant hard pressing plates in the second step and the fifth step, the differential loop switching is automatically realized, and the correctness of differential flow calculation and differential protection action is ensured; when the operation of the bypass is exited, the related hard pressing plate is exited in the first step and the fourth step, so that the operation process is protected and identified, the differential loop switching is automatically realized, and the accuracy of differential flow calculation and differential protection action is ensured. According to the technical scheme provided by the invention, the differential loop is automatically switched through the change of the software tracking operation mode according to the characteristics and the specificity of the interval current transformer arranged on the outer side wiring of the bypass bus, so that the reliability of the differential protection action is ensured.
Description
Technical Field
The invention relates to the technical field of differential protection of power systems, in particular to a differential protection method and device in a special bypass wiring mode.
Background
The bus is an important component of a power plant and a transformer substation, is an important device for collecting and distributing electric energy, has a plurality of main wiring modes of the bus, and has the advantages that under the wiring modes of a common single bus, a double bus and the like, when the interval breaker is overhauled, the interval must be powered off, and for the wiring mode with the side bus, when the interval breaker is overhauled, the interval breaker can be continuously powered on through the side bus and the side bus, so that the interval breaker can be overhauled without power failure, and the power supply reliability is improved. And for the single bus-bar bypass wiring mode of the current transformer arranged outside the bypass bus bar, differential current can occur when differential protection calculation is carried out, and incorrect action of bus differential protection can be caused.
Disclosure of Invention
Based on the above situation in the prior art, the present invention aims to provide a differential protection method and device under a special bypass connection mode, which automatically switches a differential loop through the change of a software tracking operation mode according to the characteristics and the particularities of the wiring of an interval current transformer arranged on the outer side of a bypass bus, so as to ensure the reliability of the differential protection action.
In order to achieve the above object, according to one aspect of the present invention, there is provided a differential protection method in a special bypass wiring form including a single bus-bar bypass wiring form in which a current transformer is installed outside a bypass bus, the differential protection method being used for supplying power to an electrical space to be repaired through the bypass bus via the bypass breaker when the circuit breaker of the electrical space to be repaired needs repair; the method comprises the following steps of:
s11, closing a bypass breaker to electrify a bypass bus;
s12, putting a bypass mode hard pressing plate;
s13, closing a bypass bus disconnecting link of an electrical interval to be overhauled, and connecting the electrical interval to be overhauled into a bypass bus;
s14, disconnecting an interval breaker of the electrical interval to be overhauled, and supplying power to the electrical interval to be overhauled through a bypass bus by a bypass breaker;
s15, putting the to-be-overhauled electric spacing side belt operation hard pressing plate.
Further, in step S12, a differential loop switching is performed in response to the bypass-mode hard platen, so that the differential current of the differential protection is calculated without considering the current I of the bypass current transformer 1 。
Further, in step S15, the differential loop switching is performed in response to the bypass operation hard pressing plate, so that the differential current of the differential protection is calculated without counting the current I of the current transformer of the electrical interval to be overhauled, and the current I of the bypass current transformer is calculated at the same time 1 Accounting for the difference stream.
Further, the method also comprises the step of exiting the bypass operation.
Further, the step of exiting the bypass band operation includes:
s21, withdrawing the to-be-overhauled electrical interval bypass operation hard pressing plate;
s22, closing the electrical interval breaker to be overhauled;
s23, opening a bypass breaker;
s24, the bypass mode hard pressing plate is withdrawn, and the next bypass operation is waited.
Further, in step S21, in response to the withdrawal of the to-be-overhauled electrical space bypass operation hard pressing plate, differential loop switching is performed, and the current I of the bypass current transformer is not counted during differential flow calculation 1 And simultaneously taking the current I of the current transformer of the electrical interval to be overhauled into the differential flow.
Further, in step S24, in response to exiting the bypass-mode hard platen, differential loop switching is performed to bypass the current transformer current I 1 The difference stream is reckoned.
According to another aspect of the present invention, there is provided a differential protection device in a special bypass wiring form including a single bus-bar bypass wiring form in which a current transformer is installed outside a bypass bus-bar, the differential protection method being for supplying power to an electrical space to be repaired through the bypass bus-bar via the bypass circuit breaker when the circuit breaker of the electrical space to be repaired needs repair; the device comprises a bypass operation module and an exit bypass operation module; wherein,
the bypass operation module is used for executing bypass operation steps so as to realize differential protection in the bypass operation process;
the exiting side band operation module is used for executing the exiting side band operation step so as to realize differential protection in the exiting side band operation process.
Further, the bypass operation module executes bypass operation steps, including:
s11, closing a bypass breaker to electrify a bypass bus;
s12, putting a bypass mode hard pressing plate;
s13, closing a bypass bus disconnecting link of an electrical interval to be overhauled, and connecting the electrical interval to be overhauled into a bypass bus;
s14, disconnecting an interval breaker of the electrical interval to be overhauled, and supplying power to the electrical interval to be overhauled through a bypass bus by a bypass breaker;
s15, putting the to-be-overhauled electric spacing side belt operation hard pressing plate.
Further, the exiting side band operation module executes the exiting side band operation steps, including:
s21, withdrawing the to-be-overhauled electrical interval bypass operation hard pressing plate;
s22, closing the electrical interval breaker to be overhauled;
s23, opening a bypass breaker;
s24, the bypass mode hard pressing plate is withdrawn, and the next bypass operation is waited.
In summary, the present invention provides a differential protection method and device under a special bypass connection mode, and the method includes that during bypass operation, relevant hard pressing plates are put into the second step and the fifth step to protect and identify the operation process, and differential loop switching is automatically realized, so that accuracy of differential flow calculation and differential protection action is ensured; when the operation of the bypass is exited, the related hard pressing plate is exited in the first step and the fourth step, so that the operation process is protected and identified, the differential loop switching is automatically realized, and the accuracy of differential flow calculation and differential protection action is ensured. According to the technical scheme provided by the invention, the differential loop is automatically switched through the change of the software tracking operation mode according to the characteristics and the specificity of the interval current transformer arranged on the outer side wiring of the bypass bus, so that the reliability of the differential protection action is ensured.
Drawings
FIG. 1 is a schematic diagram of a single bus bar bypass connection;
FIG. 2 is a schematic diagram of a single busbar bypass wiring scheme with current transformers mounted outside the bypass busbar.
Detailed Description
The objects, technical solutions and advantages of the present invention will become more apparent by the following detailed description of the present invention with reference to the accompanying drawings. It should be understood that the description is only illustrative and is not intended to limit the scope of the invention. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present invention.
At present, a common single bus-bar bypass connection is shown in fig. 1, taking a space 1 as an example under the connection form shown in fig. 1, when the space 1 circuit breaker needs to be overhauled, the space 1 can be powered through the bypass circuit breaker by the bypass bus, and the general bypass operation steps are briefly described as follows:
the first step: closing the bypass breaker to charge the bypass bus;
and a second step of: closing the gap 1 bypass bus disconnecting link, and connecting the gap 1 into the bypass bus;
and a third step of: the interval 1 circuit breaker is opened, and the interval 1 is powered by the bypass circuit breaker through the bypass bus.
The whole operation process does not influence bus differential current calculation, and differential protection logic is consistent with that in normal operation, so that correct action can be realized. However, in the case of a special wiring form in which the space current transformer is installed outside the bypass bus, a differential current will occur in the differential circuit during the bypass operation according to the above steps, which may cause incorrect operation of the differential protection of the bus.
The single busbar bypass wiring form of the current transformer mounted outside the bypass busbar is shown in fig. 2. In this form of wiring, the following is still explained with the interval 1 bypass operation:
the first step: closing the bypass breaker to charge the bypass bus;
and a second step of: closing the gap 1 bypass bus disconnecting link, and connecting the gap 1 into the bypass bus; at the moment, the current actually flowing out of the bus is I 1 +I 2 I.e. I, but the current accounting for the differential flow is I 1 +I, therefore differential flow will occur, possibly leading to incorrect operation of the bus differential protection;
and a third step of: opening the interval 1 breaker, and supplying power to the interval 1 through a bypass breaker by a bypass parent; at this time I 2 At zero, the actual current flowing out of the bus is only I 1 (at this time I) 1 Exactly the same as I), but the current accounting for the differential flow is I 1 +I, therefore, differential flow will occur, potentially leading to improper operation of the bus differential protection.
In order to prevent incorrect differential protection actions in the bypass operation process, the characteristics and the specificity of the wiring of the interval current transformer arranged on the outer side of the bypass bus are required to be studied, and the differential loop is automatically switched through the change of a software tracking operation mode, so that the reliability of the differential protection actions is ensured. Aiming at the problems, the embodiment of the invention provides a differential protection method in a special bypass wiring mode, the core content of which is mainly to track and identify the bypass operation process, and the differential loop switching is automatically completed at different stages of the bypass operation, so that the reliability of differential protection in the bypass operation process is ensured. The following describes the technical scheme of the present invention in detail with reference to the accompanying drawings. According to one embodiment of the invention, a differential protection method in a special bypass wiring form is provided, wherein the special bypass wiring form comprises a single bus-bar bypass wiring form in which a current transformer is arranged outside a bypass bus, and the differential protection method is used for supplying power to an electrical interval to be overhauled through the bypass bus when the circuit breaker of the electrical interval to be overhauled needs overhauling; the method comprises the following bypass operation steps, taking an interval 1 as an electrical interval to be overhauled as an example:
s11, closing a bypass breaker to electrify a bypass bus;
s12, putting a bypass mode hard pressing plate; at this time, the software automatically recognizes the working condition, performs differential loop switching, and calculates the differential current without considering the current I of the bypass current transformer 1 ；
S13, closing a bypass bus disconnecting link of an electrical interval to be overhauled, and connecting the electrical interval to be overhauled into a bypass bus; at this time due to I 1 The difference stream is not counted, only I is counted into the difference stream, and therefore the difference stream is not generated;
s14, disconnecting an interval breaker of the electrical interval to be overhauled, and supplying power to the electrical interval to be overhauled through a bypass bus by a bypass breaker; at this time due to I 1 The differential flow is not counted, only I counts in the differential flow, and the differential flow is not generated, but because the current of the current transformer at the interval 1 counts in the differential flow, the bus protection range is enlarged, and the bypass bus is in fault time differential protection and also acts;
s15, putting in an electrical space bypass operation hard pressing plate to be overhauled; at the moment, software automatically recognizes the working condition, performs differential loop switching, calculates the differential current without counting the current I of the current transformer at intervals 1, and simultaneously bypasses the current I of the current transformer 1 Taking into account the differential flow, the scope of bus protection is narrowed to include only the I bus.
When the above-mentioned side-band operation step requires side-band operation, it is necessary to operate according to the above-mentioned steps, and by inputting the relevant hard pressing plate in steps S12 and S15, the operation process is protected and identified, and the differential loop switching is automatically implemented, so that the accuracy of differential flow calculation and differential protection operation is ensured.
Further, the method also comprises the step of exiting the side band operation, comprising the following steps:
s21, withdrawing the to-be-overhauled electrical interval bypass operation hard pressing plate; at this time, the software automatically recognizes the working condition, performs differential loop switching, and calculates the differential current without considering the current I of the bypass current transformer 1 Simultaneously, the current I of the current transformer at the interval 1 is counted into a differential current;
s22, closing the electrical interval breaker to be overhauled; at this time due to I 1 The difference stream is not counted, only I is counted into the difference stream, and therefore the difference stream is not generated;
s23, opening a bypass breaker; at this time due to I 1 The difference stream is not counted, only I is counted into the difference stream, and therefore the difference stream is not generated;
s24, exiting the bypass mode hard pressing plate, at the moment, automatically identifying the working condition by software, switching a differential loop, and bypassing the current I of the current transformer 1 The difference stream is reclassified and the next bypass operation is waited.
When the step of exiting the side band operation requires exiting the side band operation, the operation must be performed according to the steps, and the operation process is protected and identified by exiting the related hard pressing plate in steps S21 and S24, so as to automatically realize the switching of the differential loop and ensure the correctness of differential flow calculation and differential protection actions.
According to another embodiment of the present invention, there is provided a differential protection device in a special bypass connection form including a single bus-bar bypass connection form in which a current transformer is installed outside a bypass bus-bar, the differential protection method being used to supply power to an electrical space to be repaired through the bypass bus-bar via the bypass circuit breaker when the circuit breaker of the electrical space to be repaired needs repair; the device comprises a bypass operation module and an exit bypass operation module; wherein,
the bypass operation module is used for executing bypass operation steps so as to realize differential protection in the bypass operation process;
the exiting side band operation module is used for executing the exiting side band operation step so as to realize differential protection in the exiting side band operation process.
The steps of each module in the device of this embodiment of the present invention for implementing the functions thereof are the same as those of the first embodiment of the present invention, and will not be described herein.
In summary, the present invention relates to a differential protection method and device in a special bypass connection mode, and in the method, during bypass operation, by putting related hard pressing plates in the second step and the fifth step, the operation process is protected and identified, and differential loop switching is automatically realized, so as to ensure the correctness of differential flow calculation and differential protection actions; when the operation of the bypass is exited, the related hard pressing plate is exited in the first step and the fourth step, so that the operation process is protected and identified, the differential loop switching is automatically realized, and the accuracy of differential flow calculation and differential protection action is ensured. According to the technical scheme provided by the invention, the differential loop is automatically switched through the change of the software tracking operation mode according to the characteristics and the specificity of the interval current transformer arranged on the outer side wiring of the bypass bus, so that the reliability of the differential protection action is ensured.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explanation of the principles of the present invention and are in no way limiting of the invention. Accordingly, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present invention should be included in the scope of the present invention. Furthermore, the appended claims are intended to cover all such changes and modifications that fall within the scope and boundary of the appended claims, or equivalents of such scope and boundary.
Claims (2)
1. The differential protection method under a special bypass wiring form comprises a single bus-bar bypass wiring form in which a current transformer is arranged outside a bypass bus bar, and the differential protection method is used for supplying power to an electrical interval to be overhauled through the bypass bus bar by the bypass circuit breaker when the circuit breaker of the electrical interval to be overhauled needs overhauling; the method is characterized by comprising the following steps of:
s11, closing a bypass breaker to electrify a bypass bus;
s12, putting a bypass mode hard pressing plate, and responding to the bypass mode hard pressing plate to perform differential loop switching so as to make the differential current calculation of differential protection not to count the current I of a bypass current transformer 1 ；
S13, closing a bypass bus disconnecting link of an electrical interval to be overhauled, and connecting the electrical interval to be overhauled into a bypass bus;
s14, disconnecting an interval breaker of the electrical interval to be overhauled, and supplying power to the electrical interval to be overhauled through a bypass bus by a bypass breaker;
s15, putting in an electrical space bypass operation hard pressing plate to be overhauled; responding to the bypass operation hard pressing plate to perform differential loop switching so as to make the differential current of differential protection calculate without counting the current I of the current transformer of the electrical interval to be overhauled and simultaneously make the current I of the bypass current transformer 1 Accounting for a difference stream;
further comprising the step of exiting the bypass band operation, comprising:
s21, withdrawing the to-be-overhauled electrical interval bypass operation hard pressing plate; responding to the withdrawal of the to-be-overhauled electrical interval bypass operation hard pressing plate, performing differential loop switching, and calculating differential flow without counting the current I of the bypass current transformer 1 Simultaneously, current I of the current transformer at the electrical interval to be overhauled is counted into a differential current;
s22, closing the electrical interval breaker to be overhauled;
s23, opening a bypass breaker;
s24, exiting the bypass mode hard pressing plate, and waiting for the next bypass operation; in response to exiting the bypass mode hard platen, differential loop switching is performed bypassing current transformer current I 1 The difference stream is reckoned.
2. A differential protection device in a special bypass connection form, wherein the differential protection device in the special bypass connection form performs differential protection by using the method of claim 1, the special bypass connection form comprises a single bus-bar bypass connection form in which a current transformer is arranged outside a bypass bus, and the differential protection method is used for supplying power to an electrical interval to be overhauled through the bypass bus by the bypass breaker when the circuit breaker of the electrical interval to be overhauled needs overhauling; the device is characterized by comprising a side band operation module and an exiting side band operation module; wherein,
the bypass operation module is configured to perform bypass operation steps to implement differential protection during bypass operation, and includes:
s11, closing a bypass breaker to electrify a bypass bus;
s12, putting a bypass mode hard pressing plate;
s13, closing a bypass bus disconnecting link of an electrical interval to be overhauled, and connecting the electrical interval to be overhauled into a bypass bus;
s14, disconnecting an interval breaker of the electrical interval to be overhauled, and supplying power to the electrical interval to be overhauled through a bypass bus by a bypass breaker;
s15, putting in an electrical space bypass operation hard pressing plate to be overhauled;
the exiting side band operation module is configured to execute the exiting side band operation step to implement differential protection during exiting side band operation, and includes:
s21, withdrawing the to-be-overhauled electrical interval bypass operation hard pressing plate;
s22, closing the electrical interval breaker to be overhauled;
s23, opening a bypass breaker;
s24, the bypass mode hard pressing plate is withdrawn, and the next bypass operation is waited.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111341876.9A CN114050548B (en) | 2021-11-12 | 2021-11-12 | Differential protection method and device in special bypass wiring mode |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111341876.9A CN114050548B (en) | 2021-11-12 | 2021-11-12 | Differential protection method and device in special bypass wiring mode |
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| Publication Number | Publication Date |
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| CN114050548A CN114050548A (en) | 2022-02-15 |
| CN114050548B true CN114050548B (en) | 2024-01-12 |
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