CN212518390U - Relay protection system of power transmission line containing current-limiting reactor - Google Patents
Relay protection system of power transmission line containing current-limiting reactor Download PDFInfo
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- CN212518390U CN212518390U CN202021383807.5U CN202021383807U CN212518390U CN 212518390 U CN212518390 U CN 212518390U CN 202021383807 U CN202021383807 U CN 202021383807U CN 212518390 U CN212518390 U CN 212518390U
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Abstract
The utility model discloses a relay protection system of a power transmission line containing a current-limiting reactor, which comprises a voltage transformer and a current transformer which are respectively arranged at two sides of an overhead line; a voltage transformer and a current transformer are arranged on one side of two sides of the current-limiting reactor, which is not connected with the overhead line; the circuit protection device is provided with integrated current-limiting reactor protection functions and is respectively arranged on two sides of the whole power transmission line containing the current-limiting reactors; and after the line protection at one side acts, tripping off the circuit breaker at the side and parallelly tripping off the circuit breaker at the opposite side. The utility model discloses only need increase the system measurement station once, need not to increase relay protection device, need not to change original line protection definite value, the protection range not only includes original overhead line, still includes the current-limiting reactor, and is applicable to the current-limiting reactor and drops into and withdraw from two kinds of operational modes.
Description
Technical Field
The utility model belongs to power system relay protection field relates to a transmission line's relay protection system who contains current-limiting reactor.
Background
With the continuous development and expansion of power grids, the electrical connection is gradually tight, 500kV power grid stations in developed regions are densely distributed, the short-circuit current level of a 500kV transformer substation of a main junction is continuously improved, the short-circuit current of a 500kV bus of the transformer substation approaches or exceeds the breaking capacity of a circuit breaker, and the short-circuit current level is urgently required to be limited. The short-circuit current can be effectively reduced by adding the current-limiting reactor in the related 500kV line, and meanwhile, the power flow distribution of a power grid is influenced.
The electric distance between stations can be prolonged by additionally arranging the current-limiting reactor of the power transmission line, the structure of a power grid is not changed, but after the current-limiting reactor of the power transmission line is additionally arranged, both the positive sequence parameter and the zero sequence parameter of the system are changed, so that the impedance of the power transmission line is changed. The invention discloses a series capacitance compensation line distance protection method of a combination phase comparison relay, which is named as a series capacitance compensation line distance protection method of a combination phase comparison relay on the publication date of 200910034668.7, published on 2011, 12, month and 14.
The invention discloses a distance protection method for a power transmission line with series equipment, which is disclosed in Chinese patent application No. 201610958677.5, published 2017, 1 month and 18 days, and is named as a distance protection method for the power transmission line with the series equipment. The method has the defect that the zero sequence compensation coefficient is not easy to set.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming prior art's not enough, providing a transmission line's relay protection system who contains current-limiting reactor, adaptation current-limiting reactor drops into and withdraws from two kinds of operational modes under the condition that need not to increase relay protection device.
In order to achieve the above purpose, the solution of the present invention is:
a relay protection system of a power transmission line containing a current-limiting reactor comprises two sections, wherein the first section is the current-limiting reactor, and the second section is an overhead line; the relay protection system includes:
a voltage transformer PT1 and a current transformer CT1 which are arranged at the connection part of the first section and the second section, and a first line protection device integrating the protection function of the current-limiting reactor;
a voltage transformer PT2 and a current transformer CT2 which are arranged on the side of the second section overhead line which is not connected with the first section current limiting reactor, and a second line protection device which integrates the protection function of the current limiting reactor;
a potential transformer PT3 and a current transformer CT3 arranged on the side of the first zone current limiting reactor not connected to the second zone overhead line;
the first line protection device and the second line protection device are in communication connection;
the first line protection device is connected with the voltage transformer PT1 voltage, the current transformer CT1 current, the voltage transformer PT3 voltage and the current transformer CT3 current, and receives the voltage transformer PT2 voltage and the current transformer CT2 current from a second line protection device through communication connection;
the second line protection device is connected with the voltage of the potential transformer PT2 and the current of the current transformer CT2, and receives the voltage of the potential transformer PT3 and the current of the current transformer CT3 from the first line protection device through communication connection.
In a preferred scheme, the first line protection device utilizes the voltage of the voltage transformer PT1 and the current of the current transformer CT1 to configure a conventional protection function; the second line protection device utilizes the voltage of the voltage transformer PT2 and the current of the current transformer CT2 to configure a conventional protection function; the conventional protection functions comprise distance protection, zero sequence overcurrent protection and reclosing functions.
In a preferred embodiment, the first line protection device and the second line protection device form differential protection by using the current of the current transformer CT3 and the current of the current transformer CT2, and the protection range is the whole line including a current-limiting reactor.
In a preferred embodiment, the first line protection device uses the current of the current transformer CT1 and the current of the current transformer CT3 to form a differential protection, and the protection range is a first zone current limiting reactor.
In a preferred embodiment, the first line protection device uses the voltage of the potential transformer PT1 and the current of the current transformer CT1 to form a protection range of distance protection, and the protection range is directed to the first segment current limiting reactor.
In a preferred embodiment, the second line protection device uses the voltage of the potential transformer PT2 and the current of the current transformer CT2 to form a protection range of distance protection, and the protection range is directed to the first segment current limiting reactor.
In a preferred scheme, after the first line protection device or the second line protection device acts, an action signal is transmitted to the opposite side protection device through communication connection for joint tripping.
The utility model has the advantages that: the utility model discloses a transmission line's relay protection system who contains current-limiting reactor only needs to increase system measurement station once, need not to increase relay protection device, need not to change original line protection definite value, and the protective range not only includes original overhead line, still includes the current-limiting reactor, and is applicable to the current-limiting reactor and drops into and withdraw from two kinds of operational modes.
Drawings
Fig. 1 is a schematic diagram of a relay protection system of a power transmission line with a current-limiting reactor.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to the accompanying drawings.
Fig. 1 shows a schematic diagram of an embodiment of a relay protection system for a power transmission line including a current-limiting reactor according to the present invention. The power transmission line with the current-limiting reactor comprises two sections, wherein the first section is the current-limiting reactor, and the second section is an overhead line. The relay protection system of the transmission line containing the current-limiting reactor comprises: a voltage transformer PT1 and a current transformer CT1 which are arranged at the connection part of the first section and the second section, and a first line protection device integrating the protection function of the current-limiting reactor; a voltage transformer PT2 and a current transformer CT2 which are arranged on the side of the second section overhead line which is not connected with the first section current limiting reactor, and a second line protection device which integrates the protection function of the current limiting reactor; a potential transformer PT3 and a current transformer CT3 arranged on the side of the first zone current limiting reactor not connected to the second zone overhead line; the first line protection device and the second line protection device are in communication connection; the first line protection device is connected with the voltage transformer PT1 voltage, the current transformer CT1 current, the voltage transformer PT3 voltage and the current transformer CT3 current, and receives the voltage transformer PT2 voltage and the current transformer CT2 current from a second line protection device through communication connection; the second line protection device is connected with the voltage of the potential transformer PT2 and the current of the current transformer CT2, and receives the voltage of the potential transformer PT3 and the current of the current transformer CT3 from the first line protection device through communication connection.
In a preferred embodiment, the first line protection device utilizes the voltage transformer PT1 voltage and the current transformer CT1 current to configure a conventional protection function; the second line protection device utilizes the voltage of the voltage transformer PT2 and the current of the current transformer CT2 to configure a conventional protection function; the conventional protection functions comprise distance protection, zero sequence overcurrent protection and reclosing functions.
In a preferred embodiment, the first line protection device and the second line protection device form differential protection by using the current of the current transformer CT3 and the current of the current transformer CT2, and the protection range is the whole line containing a current-limiting reactor.
In a preferred embodiment, the first line protection device utilizes the current of the current transformer CT1 and the current of the current transformer CT3 to form differential protection, and the protection range is a first section current-limiting reactor.
In a preferred embodiment, the first line protection device utilizes the voltage of a potential transformer PT1 and the current of a current transformer CT1 to form a protection range of distance protection and points to the first section current limiting reactor.
In a preferred embodiment, the second line protection device utilizes the voltage of the potential transformer PT2 and the current of the current transformer CT2 to form a protection range of distance protection and points to the first section current limiting reactor.
In a preferred embodiment, after the first line protection device or the second line protection device acts, the acting signal is transmitted to the opposite side protection device through the communication connection to carry out the joint jump. The devices can be connected in a communication mode through the optical fiber channel, and after the first line protection device or the second line protection device acts, the first line protection device or the second line protection device communicates with the opposite side protection device through the optical fiber channel to achieve combined hop.
Above embodiment only is for explaining the utility model discloses a technical thought can not be injectd with this the utility model discloses a protection scope, all according to the utility model provides a technical thought, any change of doing on technical scheme basis all falls into the utility model discloses within the protection scope.
Claims (7)
1. A relay protection system of a power transmission line containing a current-limiting reactor comprises two sections, wherein the first section is the current-limiting reactor, and the second section is an overhead line; characterized in that, the relay protection system includes:
a voltage transformer PT1 and a current transformer CT1 which are arranged at the connection part of the first section and the second section, and a first line protection device integrating the protection function of the current-limiting reactor;
a voltage transformer PT2 and a current transformer CT2 which are arranged on the side of the second section overhead line which is not connected with the first section current limiting reactor, and a second line protection device which integrates the protection function of the current limiting reactor;
a potential transformer PT3 and a current transformer CT3 arranged on the side of the first zone current limiting reactor not connected to the second zone overhead line;
the first line protection device and the second line protection device are in communication connection;
the first line protection device is connected with the voltage transformer PT1 voltage, the current transformer CT1 current, the voltage transformer PT3 voltage and the current transformer CT3 current, and receives the voltage transformer PT2 voltage and the current transformer CT2 current from a second line protection device through communication connection;
the second line protection device is connected with the voltage of the potential transformer PT2 and the current of the current transformer CT2, and receives the voltage of the potential transformer PT3 and the current of the current transformer CT3 from the first line protection device through communication connection.
2. The relay protection system of the power transmission line with the current-limiting reactor as claimed in claim 1, wherein: the first line protection device utilizes the voltage of the voltage transformer PT1 and the current of the current transformer CT1 to configure a conventional protection function; the second line protection device utilizes the voltage of the voltage transformer PT2 and the current of the current transformer CT2 to configure a conventional protection function; the conventional protection functions comprise distance protection, zero sequence overcurrent protection and reclosing functions.
3. The relay protection system of the power transmission line with the current-limiting reactor as claimed in claim 1, wherein: the first line protection device and the second line protection device form differential protection by utilizing the current of the current transformer CT3 and the current of the current transformer CT2, and the protection range is the whole line containing a current-limiting reactor.
4. The relay protection system of the power transmission line with the current-limiting reactor as claimed in claim 1, wherein: the first line protection device utilizes the current of the current transformer CT1 and the current of the current transformer CT3 to form differential protection, and the protection range is a first section current limiting reactor.
5. The relay protection system of the power transmission line with the current-limiting reactor as claimed in claim 2, wherein: the first line protection device utilizes the voltage of the voltage transformer PT1 and the current of the current transformer CT1 to form a protection range of distance protection and points to a first section current limiting reactor.
6. The relay protection system of the power transmission line with the current-limiting reactor as claimed in claim 1, wherein: the second line protection device utilizes the voltage of the potential transformer PT2 and the current of the current transformer CT2 to form a protection range of distance protection and points to the first section current limiting reactor.
7. The relay protection system of the power transmission line with the current-limiting reactor as claimed in claim 1, wherein: and after the first line protection device or the second line protection device acts, an action signal is transmitted to the opposite side protection device for joint jump through communication connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021383807.5U CN212518390U (en) | 2020-07-14 | 2020-07-14 | Relay protection system of power transmission line containing current-limiting reactor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021383807.5U CN212518390U (en) | 2020-07-14 | 2020-07-14 | Relay protection system of power transmission line containing current-limiting reactor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212518390U true CN212518390U (en) | 2021-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021383807.5U Active CN212518390U (en) | 2020-07-14 | 2020-07-14 | Relay protection system of power transmission line containing current-limiting reactor |
Country Status (1)
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| CN (1) | CN212518390U (en) |
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