Power supply circuit for mutual standby of I and II loops of transformer substation
By designing a backup power supply circuit for substation lines I and II, the problem of low power supply reliability caused by inconsistent current transformer ratios was solved. This achieved backup power supply for the lines, reduced electricity costs, optimized the power grid structure, and improved power supply reliability and economic benefits.
Patent Information
- Application Number
- CN202520094120.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-15
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2035-01-15
AI Technical Summary
In existing substations, the current transformer ratios on the three sides are inconsistent, and the circuit cannot be closed and switched, resulting in low power supply reliability. With the implementation of capacity replacement technology upgrade and transformation projects, the new capacity load is transferred to the newly built substation, the load in the original substation is reduced, and the unit cost of electricity is increased.
Design a substation circuit in which lines I and II serve as backup power supplies for each other, including specific electrical equipment connection methods. By replacing the current transformer, lines I and II can serve as backup power supplies for each other, and loop switching can be achieved during the switching process.
It has improved power supply reliability, optimized the power grid operation structure, reduced electricity costs, provided a safe and reliable power supply, and brought about good economic and social benefits.
Smart Images
Figure CN223872084U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of substation technology, specifically to a substation circuit in which lines I and II serve as backup power supplies for each other. Background Technology
[0002] In existing technologies, the current transformer ratios on the three sides of a substation are often inconsistent, the circuits cannot be closed-looped for switching, and they cannot serve as backups for each other, resulting in low power supply reliability. As the capacity replacement technology upgrade and transformation projects are continuously completed, the load of new capacity is transferred to newly built substations, the load in the original substations decreases, and the cost per unit of electricity increases. Summary of the Invention
[0003] The purpose of this application is to provide a substation circuit where lines I and II serve as backup power supplies for each other, in order to solve the problem in the existing technology where, as the capacity replacement technology upgrade and transformation project is completed, the load of the new capacity is transferred to the newly built substation, the load in the original substation decreases, and the cost per kilowatt-hour increases.
[0004] To achieve the above objectives, this application provides a substation circuit where lines I and II serve as backup power supplies for each other, comprising: line II, line I, and a connection circuit between the lines.
[0005] The II circuit includes: a first surge arrester, a first voltage transformer, a first disconnecting switch, a first fast grounding switch, a first maintenance grounding switch, a first current transformer, a first circuit breaker, a second current transformer, a second disconnecting switch, a second maintenance grounding switch, a third disconnecting switch, a third maintenance grounding switch, a fourth maintenance grounding switch, a third current transformer, a second surge arrester, a fourth disconnecting switch, a fourth current transformer, and a first transformer;
[0006] The first circuit includes: a third surge arrester, a second voltage transformer, a fifth disconnecting switch, a second fast grounding switch, a fifth maintenance grounding switch, a fifth current transformer, a second circuit breaker, a sixth current transformer, a sixth disconnecting switch, a sixth maintenance grounding switch, a seventh disconnecting switch, an eighth maintenance grounding switch, a ninth maintenance grounding switch, a seventh circuit transformer, a fourth surge arrester, an eighth disconnecting switch, an eighth current transformer, and a second transformer;
[0007] The return connection circuit includes: a ninth disconnecting switch, a tenth maintenance grounding switch, a ninth current transformer, a third circuit breaker, a tenth current transformer, a tenth disconnecting switch, and an eleventh maintenance grounding switch, wherein...
[0008] One end of the ninth disconnecting switch is connected to the other end of the second disconnecting switch of the II circuit. One end of the tenth maintenance grounding switch is connected to the other end of the ninth disconnecting switch, and the other end of the tenth maintenance grounding switch is grounded. One end of the ninth current transformer is connected to the other end of the ninth disconnecting switch. The other end of the ninth current transformer is connected to one end of the third circuit breaker. The other end of the third circuit breaker is connected to one end of the tenth current transformer. The other end of the tenth current transformer is connected to one end of the tenth disconnecting switch and the eleventh maintenance grounding switch, and the other end of the eleventh maintenance grounding switch is grounded. The other end of the tenth disconnecting switch is connected to the other end of the sixth disconnecting switch of the I circuit.
[0009] Optionally, one end of the first surge arrester is connected to one end of the first voltage transformer, the first disconnecting switch, and the first fast grounding switch; the other end of the first surge arrester is grounded; the other end of the first fast grounding switch is grounded; the other end of the first disconnecting switch is connected to one end of the first current transformer; the other end of the first current transformer is connected to one end of the first circuit breaker; the other end of the first circuit breaker is connected to one end of the second current transformer; the other end of the second current transformer is connected to one end of the second disconnecting switch and the second maintenance grounding switch; the other end of the second maintenance grounding switch is grounded; the other end of the second disconnecting switch is connected to one end of the third disconnecting switch and the third maintenance grounding switch; the other end of the third maintenance grounding switch is grounded; the other end of the third disconnecting switch is connected to one end of the fourth maintenance grounding switch and the third current transformer; the other end of the fourth maintenance grounding switch is grounded; and the other end of the third current transformer is connected to the incoming terminal of the first transformer.
[0010] Optionally, one end of the second surge arrester, the fourth disconnecting switch, and the fourth current transformer is connected to the first transformer, and the other end of the second surge arrester, the fourth disconnecting switch, and the fourth current transformer is grounded.
[0011] Optionally, one end of the third surge arrester is connected to one end of the second voltage transformer, the fifth disconnecting switch, and the second fast grounding switch; the other end of the third surge arrester is grounded; the other end of the second fast grounding switch is grounded; the other end of the fifth disconnecting switch is connected to one end of the fifth current transformer; the other end of the fifth current transformer is connected to one end of the second circuit breaker; the other end of the second circuit breaker is connected to one end of the sixth current transformer; the other end of the sixth current transformer is connected to one end of the sixth disconnecting switch and the sixth maintenance grounding switch; the other end of the sixth maintenance grounding switch is grounded; the other end of the seventh disconnecting switch is connected to one end of the eighth disconnecting switch and the ninth maintenance grounding switch; the other end of the ninth maintenance grounding switch is grounded; the other end of the seventh disconnecting switch is connected to one end of the ninth maintenance grounding switch and the seventh current transformer; the other end of the ninth maintenance grounding switch is grounded; and the other end of the seventh current transformer is connected to the incoming terminal of the second transformer.
[0012] Optionally, one end of the fourth surge arrester, the eighth disconnecting switch, and the eighth current transformer is connected to the second transformer, and the other end of the fourth surge arrester, the eighth disconnecting switch, and the eighth current transformer is grounded.
[0013] Optionally, it also includes:
[0014] The second main transformer has its input terminal connected to the first output terminal of the first transformer of the II circuit.
[0015] Optionally, it also includes:
[0016] The first main transformer is connected to the first output terminal of the second transformer of the I circuit.
[0017] Optionally, it also includes:
[0018] Section I busbar, the incoming end of which is connected to the second outgoing end of the second transformer of the first circuit.
[0019] Optionally, it also includes:
[0020] Section II busbar, the incoming end of which is connected to the second outgoing end of the first transformer of the II circuit.
[0021] The embodiments of this application have the following advantages:
[0022] Compared with existing technologies, the above-mentioned technical solution provides a backup power supply circuit for substation lines I and II. After replacing the current transformers, the substation can achieve mutual backup power supply for lines I and II. Calculations and observations show that after the load meets the conditions for a primary and backup power supply, electricity costs are reduced. The substation can achieve mutual backup power supply for lines I and II, and the switching process can be completed in a closed loop, eliminating the need for production shutdowns, power outages, and subsequent power switching and resumption, which caused economic losses due to production disruptions and shutdowns. The power grid operation mode can be adjusted promptly according to the company's production schedule, better optimizing the company's power grid structure and providing a safe, reliable, and stable power supply guarantee. It has good operational management and social benefits.
[0023] Replacing the current transformer not only improved power supply reliability and optimized the power grid operation structure, but also brought good economic and social benefits, and maintained the sustainability of the above benefits, resulting in good overall benefits. Attached Figure Description
[0024] To more clearly illustrate the embodiments of this application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.
[0025] Figure 1 This is a schematic diagram of the circuit connection structure of a substation circuit I and II, which serve as backup power supply circuits for each other, provided for at least one embodiment of this application. Detailed Implementation
[0026] The following specific embodiments illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0027] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Unless otherwise expressly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication of two elements. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0028] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.
[0029] This application provides a substation circuit where lines I and II serve as backup power supplies for each other. (Refer to...) Figure 1 This includes: Line II, Line I, and the connection circuit for the return lines, wherein...
[0030] The II circuit includes: a first surge arrester, a first voltage transformer, a first disconnecting switch, a first fast grounding switch, a first maintenance grounding switch, a first current transformer, a first circuit breaker, a second current transformer, a second disconnecting switch, a second maintenance grounding switch, a third disconnecting switch, a third maintenance grounding switch, a fourth maintenance grounding switch, a third current transformer, a second surge arrester, a fourth disconnecting switch, a fourth current transformer, and a first transformer.
[0031] In some embodiments, one end of the first surge arrester is connected to one end of the first voltage transformer, the first disconnecting switch, and the first fast grounding switch; the other end of the first surge arrester is grounded; the other end of the first fast grounding switch is grounded; the other end of the first disconnecting switch is connected to one end of the first current transformer; the other end of the first current transformer is connected to one end of the first circuit breaker; the other end of the first circuit breaker is connected to one end of the second current transformer; the other end of the second current transformer is connected to one end of the second disconnecting switch and the second maintenance grounding switch; the other end of the second maintenance grounding switch is grounded; the other end of the second disconnecting switch is connected to one end of the third disconnecting switch and the third maintenance grounding switch; the other end of the third maintenance grounding switch is grounded; the other end of the third disconnecting switch is connected to one end of the fourth maintenance grounding switch and the third current transformer; the other end of the fourth maintenance grounding switch is grounded; and the other end of the third current transformer is connected to the incoming terminal of the first transformer.
[0032] In some embodiments, one end of the second surge arrester, the fourth disconnecting switch, and the fourth current transformer is connected to the first transformer, and the other end of the second surge arrester, the fourth disconnecting switch, and the fourth current transformer is grounded.
[0033] Circuit I includes: the third surge arrester, the second voltage transformer, the fifth disconnecting switch, the second fast grounding switch, the fifth maintenance grounding switch, the fifth current transformer, the second circuit breaker, the sixth current transformer, the sixth disconnecting switch, the sixth maintenance grounding switch, the seventh disconnecting switch, the eighth maintenance grounding switch, the ninth maintenance grounding switch, the seventh circuit transformer, the fourth surge arrester, the eighth disconnecting switch, the eighth current transformer, and the second transformer.
[0034] In some embodiments, one end of the third surge arrester is connected to one end of the second voltage transformer, the fifth disconnecting switch, and the second fast grounding switch; the other end of the third surge arrester is grounded; the other end of the second fast grounding switch is grounded; the other end of the fifth disconnecting switch is connected to one end of the fifth current transformer; the other end of the fifth current transformer is connected to one end of the second circuit breaker; the other end of the second circuit breaker is connected to one end of the sixth current transformer; the other end of the sixth current transformer is connected to one end of the sixth disconnecting switch and the sixth maintenance grounding switch; the other end of the sixth maintenance grounding switch is grounded; the other end of the seventh disconnecting switch is connected to one end of the eighth disconnecting switch and the ninth maintenance grounding switch; the other end of the ninth maintenance grounding switch is grounded; the other end of the seventh disconnecting switch is connected to one end of the ninth maintenance grounding switch and the seventh current transformer; the other end of the ninth maintenance grounding switch is grounded; and the other end of the seventh current transformer is connected to the incoming terminal of the second transformer.
[0035] In some embodiments, one end of the fourth surge arrester, the eighth disconnecting switch, and the eighth current transformer is connected to the second transformer, and the other end of the fourth surge arrester, the eighth disconnecting switch, and the eighth current transformer is grounded.
[0036] The return connection circuit includes: the ninth disconnecting switch, the tenth maintenance grounding switch, the ninth current transformer, the third circuit breaker, the tenth current transformer, the tenth disconnecting switch, and the eleventh maintenance grounding switch, among which,
[0037] One end of the ninth disconnecting switch is connected to the other end of the second disconnecting switch of the II circuit. One end of the tenth maintenance grounding switch is connected to the other end of the ninth disconnecting switch, and the other end of the tenth maintenance grounding switch is grounded. One end of the ninth current transformer is connected to the other end of the ninth disconnecting switch. The other end of the ninth current transformer is connected to one end of the third circuit breaker. The other end of the third circuit breaker is connected to one end of the tenth current transformer. The other end of the tenth current transformer is connected to one end of the tenth disconnecting switch and the eleventh maintenance grounding switch, and the other end of the eleventh maintenance grounding switch is grounded. The other end of the tenth disconnecting switch is connected to the other end of the sixth disconnecting switch of the I circuit.
[0038] In some embodiments, it also includes:
[0039] The second main transformer has its input terminal connected to the first output terminal of the first transformer of the II circuit.
[0040] In some embodiments, it also includes:
[0041] The first main transformer is connected to the first output terminal of the second transformer of the I circuit.
[0042] In some embodiments, it also includes:
[0043] Section I busbar, the incoming end of which is connected to the second outgoing end of the second transformer of the first circuit.
[0044] In some embodiments, it also includes:
[0045] Section II busbar, the incoming end of which is connected to the second outgoing end of the first transformer of the II circuit.
[0046] In summary, compared with existing technologies, replacing the current transformers allows the substation to achieve mutual backup power supply for lines I and II. Calculations and observations show that after the load meets the conditions for a primary and backup power supply, electricity costs are reduced. The substation can achieve mutual backup power supply for lines I and II, and the switching process can be completed in a closed loop, eliminating the need for initial production shutdowns, power outages, and subsequent power switching and resumption, which caused economic losses due to production disruptions and shutdowns. The substation can adjust the power grid operation mode in a timely manner according to the company's production schedule, better optimize the company's power grid structure, and provide a safe, reliable, and stable power supply guarantee. It has good operational management and social benefits.
[0047] Replacing the current transformer not only improved power supply reliability and optimized the power grid operation structure, but also brought good economic and social benefits, and maintained the sustainability of the above benefits, resulting in good overall benefits.
[0048] Note that, unless otherwise explicitly stated, all features disclosed in this specification (including any appended claims, abstract, and drawings) may be replaced by alternative features for achieving the same, equivalent, or similar purpose. Therefore, unless explicitly stated otherwise, each disclosed feature is merely one example of a set of equivalent or similar features. Where used, "further," "preferably," "even further," and "more preferably" are simple starting points for describing another embodiment based on the foregoing embodiments, the combination of which with the foregoing embodiments constitutes the complete configuration of another embodiment. Any combination of several "further," "preferably," "even further," or "more preferably" settings following the same embodiment constitutes yet another embodiment.
[0049] In the implementation of functions and steps, the corresponding functions and steps in the various embodiments may occur in a different order than those shown. For example, two consecutive functions and steps may actually be executed or implemented substantially in parallel, and they may sometimes be executed or implemented in reverse order, depending on the functions involved.
[0050] Although this application has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of this application fall within the scope of protection claimed in this application.
Claims
1. A substation circuit where lines I and II serve as backup power supplies for each other, characterized in that, include: Circuit II, circuit I, and circuit III are connected, among which, The II circuit includes: a first surge arrester, a first voltage transformer, a first disconnecting switch, a first fast grounding switch, a first maintenance grounding switch, a first current transformer, a first circuit breaker, a second current transformer, a second disconnecting switch, a second maintenance grounding switch, a third disconnecting switch, a third maintenance grounding switch, a fourth maintenance grounding switch, a third current transformer, a second surge arrester, a fourth disconnecting switch, a fourth current transformer, and a first transformer; The first circuit includes: a third surge arrester, a second voltage transformer, a fifth disconnecting switch, a second fast grounding switch, a fifth maintenance grounding switch, a fifth current transformer, a second circuit breaker, a sixth current transformer, a sixth disconnecting switch, a sixth maintenance grounding switch, a seventh disconnecting switch, an eighth maintenance grounding switch, a ninth maintenance grounding switch, a seventh circuit transformer, a fourth surge arrester, an eighth disconnecting switch, an eighth current transformer, and a second transformer; The return connection circuit includes: a ninth disconnecting switch, a tenth maintenance grounding switch, a ninth current transformer, a third circuit breaker, a tenth current transformer, a tenth disconnecting switch, and an eleventh maintenance grounding switch, wherein... One end of the ninth disconnecting switch is connected to the other end of the second disconnecting switch of the II circuit. One end of the tenth maintenance grounding switch is connected to the other end of the ninth disconnecting switch, and the other end of the tenth maintenance grounding switch is grounded. One end of the ninth current transformer is connected to the other end of the ninth disconnecting switch. The other end of the ninth current transformer is connected to one end of the third circuit breaker. The other end of the third circuit breaker is connected to one end of the tenth current transformer. The other end of the tenth current transformer is connected to one end of the tenth disconnecting switch and the eleventh maintenance grounding switch, and the other end of the eleventh maintenance grounding switch is grounded. The other end of the tenth disconnecting switch is connected to the other end of the sixth disconnecting switch of the I circuit.
2. The substation circuit I and II, which serve as backup power supplies for each other, as described in claim 1, is characterized in that... One end of the first surge arrester is connected to one end of the first voltage transformer, the first disconnecting switch, and the first fast grounding switch. The other end of the first surge arrester is grounded. The other end of the first fast grounding switch is grounded. The other end of the first disconnecting switch is connected to one end of the first current transformer. The other end of the first current transformer is connected to one end of the first circuit breaker. The other end of the first circuit breaker is connected to one end of the second current transformer. The other end of the second current transformer is connected to one end of the second disconnecting switch and the second maintenance grounding switch. The other end of the second maintenance grounding switch is grounded. The other end of the second disconnecting switch is connected to one end of the third disconnecting switch and the third maintenance grounding switch. The other end of the third maintenance grounding switch is grounded. The other end of the third disconnecting switch is connected to one end of the fourth maintenance grounding switch and the third current transformer. The other end of the fourth maintenance grounding switch is grounded. The other end of the third current transformer is connected to the incoming terminal of the first transformer.
3. The substation circuit I and II, which serve as backup power supplies for each other, as described in claim 2, is characterized in that... One end of the second surge arrester, the fourth disconnecting switch, and the fourth current transformer is connected to the first transformer, and the other end of the second surge arrester, the fourth disconnecting switch, and the fourth current transformer is grounded.
4. The substation circuit I and II, which serve as backup power supplies for each other, as described in claim 1, is characterized in that... One end of the third surge arrester is connected to one end of the second voltage transformer, the fifth disconnecting switch, and the second fast grounding switch. The other end of the third surge arrester is grounded. The other end of the second fast grounding switch is grounded. The other end of the fifth disconnecting switch is connected to one end of the fifth current transformer. The other end of the fifth current transformer is connected to one end of the second circuit breaker. The other end of the second circuit breaker is connected to one end of the sixth current transformer. The other end of the sixth current transformer is connected to one end of the sixth disconnecting switch and the sixth maintenance grounding switch. The other end of the sixth maintenance grounding switch is grounded. The other end of the seventh disconnecting switch is connected to one end of the eighth disconnecting switch and the ninth maintenance grounding switch. The other end of the ninth maintenance grounding switch is grounded. The other end of the seventh disconnecting switch is connected to one end of the ninth maintenance grounding switch and the seventh current transformer. The other end of the ninth maintenance grounding switch is grounded. The other end of the seventh current transformer is connected to the incoming terminal of the second transformer.
5. The substation circuit I and II, which serve as backup power supplies for each other, as described in claim 4, is characterized in that... One end of the fourth surge arrester, the eighth disconnecting switch, and the eighth current transformer is connected to the second transformer, and the other end of the fourth surge arrester, the eighth disconnecting switch, and the eighth current transformer is grounded.
6. The substation circuit I and II, which serve as backup power supplies for each other, as described in claim 1, is characterized in that... Also includes: The second main transformer has its input terminal connected to the first output terminal of the first transformer of the II circuit.
7. The substation circuit I and II, which serve as backup power supplies for each other, as described in claim 1, is characterized in that... Also includes: The first main transformer is connected to the first output terminal of the second transformer of the I circuit.
8. The substation circuit I and II, which serve as backup power supplies for each other, as described in claim 1, is characterized in that... Also includes: Section I busbar, the incoming end of which is connected to the second outgoing end of the second transformer of the first circuit.
9. The substation circuit I and II, which serve as backup power supplies for each other, as described in claim 1, is characterized in that... Also includes: Section II busbar, the incoming end of which is connected to the second outgoing end of the first transformer of the II circuit.