CN115498516A - Alternating current system for transformer substation and transformer substation - Google Patents
Alternating current system for transformer substation and transformer substation Download PDFInfo
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- CN115498516A CN115498516A CN202211236183.8A CN202211236183A CN115498516A CN 115498516 A CN115498516 A CN 115498516A CN 202211236183 A CN202211236183 A CN 202211236183A CN 115498516 A CN115498516 A CN 115498516A
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- 230000001012 protector Effects 0.000 claims description 7
- 238000002679 ablation Methods 0.000 abstract description 4
- 230000009466 transformation Effects 0.000 abstract description 3
- 238000012423 maintenance Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000007689 inspection Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000007935 neutral effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/20—Bus-bar or other wiring layouts, e.g. in cubicles, in switchyards
- H02B1/22—Layouts for duplicate bus-bar selection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B7/00—Enclosed substations, e.g. compact substations
- H02B7/06—Distribution substations, e.g. for urban network
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Abstract
The invention discloses an alternating current system for a transformer substation and the transformer substation, wherein the alternating current system comprises an alternating current bus and a plurality of loads, each load is correspondingly connected with the alternating current bus through a first air switch, and the loads are provided with second air switches which are connected with the first air switches; the second air switch is a 4-pole switch, and the N-phase output end of the load is connected with the N-phase busbar of the alternating-current busbar through the second air switch; and the leakage protection device is connected with the first air switch and is used for realizing the leakage protection function of the load. The technical scheme that this embodiment provided has effectively solved the problem that load air switch can't install the earth leakage protection function additional, effectively avoids the cable ablation incident of catching a fire to take place, and need not to carry out great transformation to alternating current system, and the cost is lower.
Description
Technical Field
The invention relates to the technical field of power grids, in particular to an alternating current system for a transformer substation and the transformer substation.
Background
With the rapid development of power technology, the safety and stability of power systems are more and more emphasized.
In recent years, the cable ablation short circuit event caused by the insulation fault of a power cable in a cable trench occurs inside and outside a system, and the safe and stable operation of a power grid is seriously influenced. In the prior art, leakage protection is usually carried out on an alternating current system by adopting a leakage protection mode, but the problem of leakage protection misoperation is easy to occur, and potential safety hazards exist.
Disclosure of Invention
The invention provides an alternating current system for a transformer substation and the transformer substation, and aims to solve the problem that the existing alternating current system cannot be additionally provided with leakage protection.
According to an aspect of the present invention, there is provided an alternating current system for a substation, including:
the air conditioner comprises an alternating current bus and a plurality of loads, wherein each load is correspondingly connected with the alternating current bus through a first air switch, the loads are provided with second air switches, and the second air switches are connected with the first air switches; the second air switch is a 4-pole switch, and an N-phase output end of the load is connected with an N-phase busbar of the alternating-current busbar through the second air switch;
and the electric leakage protection device is connected with the first air switch and is used for realizing the electric leakage protection function of the load.
Optionally, in the plurality of loads, the second air switch in the first and last loads is a 4-pole switch.
Optionally, the load comprises a service power supply box.
Optionally, the maintenance power box includes an indicator light, the indicator light is connected between the a looks output and the N looks output of maintenance power box.
Optionally, the first air switch includes an a-phase output terminal, a B-phase output terminal, and a C-phase output terminal, and the second air switch includes an a-phase output terminal, a B-phase output terminal, a C-phase output terminal, and an N-phase output terminal;
the A phase output end, the B phase output end and the C phase output end of the first air switch are respectively correspondingly connected with the A phase busbar, the B phase busbar and the C phase busbar of the alternating current busbar, the A phase output end, the B phase output end and the C phase output end of the second air switch are respectively correspondingly connected with the A phase output end, the B phase output end and the C phase output end of the first air switch, and the N phase output end of the second air switch is connected with the zero line busbar of the alternating current busbar.
Optionally, the earth leakage protection device comprises an earth leakage protector.
According to another aspect of the invention, a substation is provided, which comprises the alternating current system for the substation provided by any embodiment of the invention.
According to the technical scheme provided by the embodiment of the invention, the second air switch in the load is set to be the 4-pole switch, so that the N-phase output end of the load is connected with the N-phase busbar of the alternating-current busbar through the second air switch, the N-phase connection of the alternating-current busbar on the load side is disconnected, and the phenomenon of leakage current vector sum non-zero leakage protection misoperation cannot occur when the leakage protection device is additionally arranged at the first air switch. The technical scheme that this embodiment provided has effectively solved the unable problem of installing the earth leakage protection function additional of load air switch, effectively avoids the cable ablation incident of catching fire, and need not to carry out great transformation to alternating current system, and the cost is lower.
It should be understood that the statements in this section do not necessarily identify key or critical features of the embodiments of the present invention, nor do they necessarily limit the scope of the invention. Other features of the present invention will become apparent from the following description.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an ac system for a substation according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another alternating current system for a substation according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in other sequences than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
As described in the background art, when an insulation fault occurs in a power cable and unbalanced current is generated, due to the inverse time limit function of the load side feeder switch protection, the power cable cannot be immediately tripped, so that the cable is burnt and ignited, and national grid companies issue a notification (No. 2022 26) about further enhancing the rectification of the potential hazard of electrical fire hazard of a cable trench of a transformer substation, and require that "lighting, maintenance and test power supply idle tripping without the leakage protection function in an ac screen for the substation is replaced by idle tripping with the leakage protection function". However, after the leakage protector is additionally installed in the alternating current system for the transformer substation in the prior art, the problem of the false operation of the leakage protector is found out by the research of the inventor, and the reason for the problem is that the load side of the alternating current system is connected in a mode of N phases in common, the load is in a double-loop power supply 'hand-in-hand' type wiring mode, and an air switch in the load is a 3-pole switch, so that the N-phase circuit on the load side is always in a connected state, the sum of the current incoming and the current outgoing of the leakage current is not zero, the load is shunted, the false operation of the leakage protector is caused, and the operation stability of the system is seriously influenced.
Based on the above problem, an embodiment of the present invention provides an ac system for a transformer substation, and fig. 1 is a schematic structural diagram of the ac system for the transformer substation provided by the embodiment of the present invention, referring to fig. 1, the ac system for the transformer substation includes an ac busbar 110 and a plurality of loads 120, each load 120 is correspondingly connected to the ac busbar 120 through a first air switch 11, the load 120 is provided with a second air switch 121, and the second air switch 121 is connected to the first air switch 11; the second air switch is a 4-pole switch, and the N-phase output end of the load is connected with the N-phase busbar of the alternating-current busbar through the second air switch 121; and an earth leakage protection device 12 connected to the first air switch 11 for implementing an earth leakage protection function of the load 120.
Specifically, the ac busbar 110 includes an a-phase busbar, a B-phase busbar, a C-phase busbar, and an N-phase busbar, where the a-phase busbar, the B-phase busbar, and the C-phase busbar are used to access a three-phase power voltage of an ac cable, and the N-phase busbar is accessed to a neutral line of a system. The load 120 is provided with a second air switch 121, and the output end of the load 120 is also provided with a first air switch 11, and the first air switch 11 is connected to a three-phase power supply voltage of an alternating current system. The first air switch 11 is required to have an earth leakage protection function as a feeder switch of the load 120, and therefore an earth leakage protection device 12 is further provided in the ac system, and the earth leakage protection device 12 is connected to the first air switch 11.
In the prior art, the second air switches 121 are all 3-pole switches, that is, on the side connected to the load 120, the N-phase bus bar in the ac bus bar 110 is directly connected to the N-phase line in the load 120, that is, the ac bus bar 110 is connected to the common neutral line (N). Under the condition of normal power utilization, the sum of the input current IA and the output current IN1 of the earth leakage protection device 112 is not zero, at this time IA = IN1+ IN2, there is a load current shunt IN2, and the earth leakage protection device 12 may malfunction, which reduces the stability of the system operation. Therefore, the first air switch 11 cannot be provided with the leakage protection function in the related art.
In this embodiment, the second air switch 121 is a 4-pole switch, and the N-phase output terminal of the load 120 is connected to the N-phase bus bar through the second air switch 121, so as to disconnect the N-phase in the common neutral line connection system. Since the second air switch 121 cuts off the N-phase line on the load 120 side, the sum of the current input IA and the current output IN1 of the earth leakage protection device 112 is zero, and there is no load current shunt IN2, at this time IA = IN1, thereby eliminating the false operation phenomenon of the earth leakage protection device 12 due to the N-phase line IN common to the system, further realizing the earth leakage protection function of the feeder switch, and effectively eliminating the electrical fire hazard of the cable trench of the transformer substation.
According to the technical scheme provided by the embodiment of the invention, the second air switch in the load is set to be the 4-pole switch, so that the N-phase output end of the load is connected with the N-phase busbar of the alternating-current busbar through the second air switch, the N-phase connection of the alternating-current busbar on the load side is disconnected, and the phenomenon of leakage current vector sum non-zero leakage protection misoperation cannot occur when the leakage protection device is additionally arranged at the first air switch. The technical scheme that this embodiment provided has effectively solved the problem that load air switch can't install the earth leakage protection function additional, effectively avoids the cable ablation incident of catching a fire to take place, and need not to carry out great transformation to alternating current system, and the cost is lower.
Optionally, in this embodiment, the ac busbars 110 are all copper bars, and have good conductivity. The earth leakage protection device 12 includes an earth leakage protector, and the earth leakage protector is connected to the first air switch 11, so that the first air switch 11 has an earth leakage protection function.
Optionally, with reference to fig. 1, in this embodiment, the load 120 adopts a dual-circuit power supply manner, and the second air switch 121 in the first load 120 on both sides of the dual-circuit power supply is designed as a 4-pole switch, that is, the second air switches 121 in the first load 120 and the last load 120 are both 4-pole switches, when the ac system normally works, because the N-phase lines on the load side are no longer directly connected to the N-phase busbar of the ac busbar, the system does not generate load shunting, and the problem of malfunction of the leakage protection device 12 caused by the sum of the incoming and outgoing currents of the leakage current being not zero is solved. Here, since the load 120 supplies power to the double circuit, it is not necessary to modify the second air switch 121 of each load 120 in the circuit, and it is only necessary to modify the second air switch 121 in the first load 120 on both sides of the double circuit power supply to a 4-pole switch, which is beneficial to reducing the system cost.
Optionally, in this embodiment, the load 120 may be a service power box. Fig. 2 is a schematic structural diagram of another alternating current system for a transformer substation according to an embodiment of the present invention, and referring to fig. 2, on the basis of the foregoing technical solution, the maintenance power box includes an indicator lamp L1, and the indicator lamp L1 is connected between an a-phase output end and an N-phase output end of the maintenance power box. When the second air switch 121 is turned on, the indicator lamp L1 is turned on to prompt the worker that the maintenance power box is in a working state.
It should be noted that fig. 2 only schematically shows one indicator light L1, and the indicator light L1 is also included in other service power boxes.
With reference to fig. 2, taking the 380V side of the ac system as an example, the 380V side electrical load includes inspection power boxes (# 1, #2, and # 3), wherein the #1 inspection power box and the #3 inspection power box respectively provide the first inspection power box at two ends of the dual-circuit power supply, and the second air switches 121 are 4-pole switches.
Specifically, the first air switch 11 includes an a-phase output terminal, a B-phase output terminal, and a C-phase output terminal, and the second air switch 121 includes an a-phase output terminal, a B-phase output terminal, a C-phase output terminal, and an N-phase output terminal; an a-phase output end, a B-phase output end and a C-phase output end of the first air switch 11 are respectively and correspondingly connected with an a-phase busbar, a B-phase busbar and a C-phase busbar of the alternating-current busbar, an a-phase output end, a B-phase output end and a C-phase output end of the second air switch 121 are respectively and correspondingly connected with an a-phase output end, a B-phase output end and a C-phase output end of the first air switch, and an N-phase output end of the second air switch 121 is connected with an N-phase busbar of the alternating-current busbar 110. Because the existence of the second air switch 121 of 4 poles, the N-phase circuit of the 380V power utilization side is disconnected, so that after the leakage protection device 12 is additionally arranged, the current input IA and the current output IN1 of leakage current are equal, the system does not generate load shunt, the problem of misoperation of the leakage protection device 12 is further solved, and the idle switch of the lighting, overhauling and testing power supply which does not have the leakage protection function IN the station AC screen is replaced by the idle switch with the leakage protection function.
Optionally, an embodiment of the present invention further provides a substation, where the substation includes the alternating current system for a substation provided in any embodiment of the present invention, and the substation also has the beneficial effects described in any embodiment.
It should be understood that various forms of the flows shown above may be used, with steps reordered, added, or deleted. For example, the steps described in the present invention may be executed in parallel, sequentially, or in different orders, and are not limited herein as long as the desired results of the technical solution of the present invention can be achieved.
The above-described embodiments should not be construed as limiting the scope of the invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. An alternating current system for a transformer substation, comprising:
the air conditioner comprises an alternating current bus and a plurality of loads, wherein each load is correspondingly connected with the alternating current bus through a first air switch, the loads are provided with second air switches, and the second air switches are connected with the first air switches; the second air switch is a 4-pole switch, and the N-phase output end of the load is connected with the N-phase busbar of the alternating-current busbar through the second air switch;
and the electric leakage protection device is connected with the first air switch and is used for realizing the electric leakage protection function of the load.
2. The ac substation system according to claim 1, wherein the second air switch in each of the first and last loads among the plurality of loads is a 4-pole switch.
3. An alternating current system for a substation according to claim 1, characterized in that the load comprises a service power box.
4. The alternating current system for the substation of claim 3, wherein the service power box comprises an indicator light connected between an A-phase output and an N-phase output of the service power box.
5. The alternating current system for a substation according to claim 1, wherein the first air switch includes an a-phase output terminal, a B-phase output terminal, and a C-phase output terminal, and the second air switch includes an a-phase output terminal, a B-phase output terminal, a C-phase output terminal, and an N-phase output terminal;
the A phase output end, the B phase output end and the C phase output end of the first air switch are respectively correspondingly connected with the A phase busbar, the B phase busbar and the C phase busbar of the alternating current busbar, the A phase output end, the B phase output end and the C phase output end of the second air switch are respectively correspondingly connected with the A phase output end, the B phase output end and the C phase output end of the first air switch, and the N phase output end of the second air switch is connected with the zero line busbar of the alternating current busbar.
6. An alternating current system for a substation according to claim 1, characterized in that said earth leakage protection device comprises an earth leakage protector.
7. A substation, characterized in that it comprises an alternating current system for substations as claimed in any of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211236183.8A CN115498516A (en) | 2022-10-10 | 2022-10-10 | Alternating current system for transformer substation and transformer substation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211236183.8A CN115498516A (en) | 2022-10-10 | 2022-10-10 | Alternating current system for transformer substation and transformer substation |
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| Publication Number | Publication Date |
|---|---|
| CN115498516A true CN115498516A (en) | 2022-12-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211236183.8A Pending CN115498516A (en) | 2022-10-10 | 2022-10-10 | Alternating current system for transformer substation and transformer substation |
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| Country | Link |
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| CN (1) | CN115498516A (en) |
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- 2022-10-10 CN CN202211236183.8A patent/CN115498516A/en active Pending
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