CN213846321U - Direct-current power supply interconnection circuit of transformer substation - Google Patents
Direct-current power supply interconnection circuit of transformer substation Download PDFInfo
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- CN213846321U CN213846321U CN202022807612.5U CN202022807612U CN213846321U CN 213846321 U CN213846321 U CN 213846321U CN 202022807612 U CN202022807612 U CN 202022807612U CN 213846321 U CN213846321 U CN 213846321U
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Abstract
The utility model discloses a DC power supply interconnection circuit of transformer substation, interconnection circuit includes: the three-phase low-voltage circuit breaker, the single-core low-voltage cable and the three-core low-voltage cable; the first wiring terminal and the second wiring terminal on the power supply side of the three-phase low-voltage circuit breaker are respectively connected with a positive closing bus and a positive control bus of the first direct-current feed screen, the third wiring terminal on the power supply side of the three-phase low-voltage circuit breaker is simultaneously connected with a negative closing bus and a negative control bus of the first direct-current feed screen, the first wiring terminal and the second wiring terminal on the load side of the three-phase low-voltage circuit breaker are respectively connected with a positive closing bus and a positive control bus of the second direct-current feed screen, and the third wiring terminal on the load side of the three-phase low-voltage circuit breaker is simultaneously connected with a negative closing bus and a negative control bus of the second direct-current feed screen. The utility model discloses can appear unusual move back the fortune back in certain DC power supply system, can realize the DC load power supply for unusual DC power supply system by another normal DC power supply system, and wiring and easy and simple to handle.
Description
Technical Field
The utility model relates to a direct current power supply technical field of transformer substation especially relates to a direct current power supply contact circuit of transformer substation.
Background
The direct current power supply is important power equipment of a transformer substation, and is an important power supply of devices for control, protection, signal indication, automation, emergency lighting and the like of the transformer substation. For a transformer substation with a voltage level of 110kV or above, two direct current power supply systems are generally configured, each of the two direct current power supply systems carries a part of load under the normal operation condition, and when one direct current power supply system fails, the two direct current power supply systems are electrically connected through air circuit breakers arranged between a control bus and a closing bus of a direct current feed screen of the two direct current power supply systems and between the closing bus and the closing bus. However, in the existing transformer substation, the electrical interconnection circuits respectively established between the control bus and the control bus of the two direct current feed panels and between the closing bus and the closing bus have the problems of more circuit breakers, complex wiring, complex operation and the like.
SUMMERY OF THE UTILITY MODEL
For the technical problem who exists among the solution above-mentioned prior art, the utility model provides a DC power supply interconnection circuit of transformer substation.
The utility model discloses a DC power supply interconnection circuit of transformer substation, interconnection circuit is used for realizing two DC power supply system's electric interconnection, include: the three-phase low-voltage circuit breaker, the single-core low-voltage cable and the three-core low-voltage cable;
the first connecting terminal and the second connecting terminal on the power supply side of the three-phase low-voltage circuit breaker are respectively connected with a positive closing bus and a positive control bus of a first direct-current feed screen of the first direct-current power supply system through the single-core low-voltage cable, a third connecting terminal at the power supply side of the three-phase low-voltage circuit breaker is simultaneously connected with a negative closing bus and a negative control bus of the first direct current feed screen through the single-core low-voltage cable, the first connecting terminal and the second connecting terminal on the load side of the three-phase low-voltage circuit breaker are respectively connected with a positive closing bus and a positive control bus of a second direct-current feed screen of the second direct-current power supply system through the three-core low-voltage cable, and a third wiring terminal on the load side of the three-phase low-voltage circuit breaker is simultaneously connected with the negative closing bus and the negative control bus of the second direct-current feed screen through the three-core low-voltage cable.
In some alternative embodiments, the three-phase low-voltage circuit breaker is a plastic-cased direct-current circuit breaker.
In some optional embodiments, the single core low voltage cable line is 25mm2Single core low pressure copper core cable conductor.
In some optional embodiments, the three-core low-voltage cable line is 3 × 25mm2Three-core low-voltage copper-core cable.
In some optional embodiments, the three-phase low-voltage circuit breaker is mounted on the first or second dc feeding panel.
The utility model discloses technical scheme's main advantage as follows:
the utility model discloses a transformer substation's DC power supply interconnection circuit can break down or unusual and need withdraw from the operation in a certain DC power supply system in two DC power supply systems, realizes being supplied power by another normal DC power supply system for unusual DC power supply system's direct current load, and the DC power supply system who causes when solving transformer substation's DC power supply system trouble moves unstable problem, and required circuit breaker is few, and the wiring is simple, easy and simple to handle.
Drawings
The accompanying drawings, which are set forth herein, serve to provide a further understanding of the embodiments of the present invention and constitute a part of this specification, and the exemplary embodiments and descriptions thereof are illustrative of the invention and do not constitute a limitation on the invention. In the drawings:
fig. 1 is a circuit diagram of a dc power supply interconnection circuit of a substation according to an embodiment of the present invention.
Detailed Description
To make the purpose, technical solution and advantages of the present invention clearer, the following will combine the embodiments of the present invention and the corresponding drawings to clearly and completely describe the technical solution of the present invention. It is obvious that the described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
The technical solution provided by the embodiments of the present invention is described in detail below with reference to the accompanying drawings.
Referring to fig. 1, an embodiment of the utility model provides a dc power supply of transformer substation liaison circuit, this liaison circuit is arranged in realizing two dc power supply system's in the transformer substation electric liaison, include: three-phase low-voltage circuit breakers (QF), single-core low-voltage cables and three-core low-voltage cables; a first connecting terminal and a second connecting terminal at the power supply side of the three-phase low-voltage circuit breaker are respectively connected with a positive closing bus (+ HM) and a positive control bus (+ KM) of a first direct-current feed screen of a first direct-current power supply system through a single-core low-voltage cable, a third connecting terminal at the power supply side of the three-phase low-voltage circuit breaker is simultaneously connected with a negative closing bus (-HM) and a negative control bus (-KM) of the first direct-current feed screen through a single-core low-voltage cable, the first connecting terminal and a second connecting terminal at the load side of the three-phase low-voltage circuit breaker are respectively connected with a positive closing bus (+ HM) and a positive control bus (+ KM) of a second direct-current feed screen of a second direct-current power supply system through the three-core low-voltage cable, and a third wiring terminal on the load side of the three-phase low-voltage circuit breaker is simultaneously connected with a negative closing bus (-HM) and a negative control bus (-KM) of the second direct-current feed screen through a three-core low-voltage cable.
The following is to the working principle of the dc power supply interconnection circuit of the transformer substation provided by an embodiment of the present invention is specifically explained:
when one of the two DC power supply systems is in fault or abnormal and needs to quit operation, checking whether the control bus and the closing bus of the two DC power supply systems have short-time parallel operation conditions or not, if the control bus and the closing bus have the short-time parallel operation conditions, closing a three-phase low-voltage circuit breaker in a connecting circuit at the moment, establishing electrical connection between the two DC power supply systems so as to carry out short-time parallel operation, then, after the voltage between the positive closing bus and the negative closing bus of the DC feed screen of the abnormal DC power supply system to be checked and the voltage between the positive control bus and the negative control bus are stabilized within a set range, sequentially disconnecting the AC power supply circuit breaker at the AC input side of each charging rectification module, the AC power supply circuit breaker at the AC input side of each power supply rectification module, the DC circuit breaker at the DC output side of each charging rectification module, the DC circuit breaker at the DC output side of each power supply rectification module in the abnormal DC power supply system, The battery pack fuse between the storage battery pack and the closing bus realizes that another normal direct-current power supply system supplies power for a direct-current load of an abnormal direct-current power supply system, can solve the problem that the direct-current power supply system of the transformer substation is unstable in operation when the direct-current power supply system fails, and is few in required circuit breakers, simple in wiring and simple and convenient to operate.
After the electrical connection between the two direct current power supply systems is established, the digital direct current insulation on-line monitoring device designed and installed on the direct current feed screen can possibly have insulation reduction alarm display, because the two direct current power supply systems respectively have respective reference grounding points, when the two direct current power supply systems run in parallel, two reference grounding points actually appear, the two reference grounding points interfere with each other, the digital direct current insulation on-line monitoring device can logically judge that the two direct current power supply systems are not completely grounded, the monitoring device of the abnormal direct current power supply system is temporarily stopped at the moment, and insulation reduction alarm is automatically eliminated.
In an embodiment of the present invention, the setting ranges of the voltage between the positive and negative switching-on buses and the voltage between the positive and negative control buses are respectively the switching-on power supply voltage value ± Y1 and the control power supply voltage value ± Y2. Wherein, the specific values of Y1 and Y2 are determined according to actual conditions. For example, when the switching device is used for electrical connection of a dc power supply system having a rated dc power supply voltage of 220V, the voltage setting range between the switching-on bus and the switching-off bus is 240 ± 5V, and the voltage setting range between the control bus and the switching-off bus is 220 ± 5V.
Further, the utility model discloses an in the embodiment, if will utilize the direct current power supply tie circuit of transformer substation to realize the electric tie between two direct current power supply system, two direct current power supply system need possess following short-time parallel operation condition:
the capacities and specification models of the storage batteries of the two direct current power supply systems are consistent, the specification models of the charging rectification module and the power supply rectification module of the two direct current power supply systems are consistent, and the voltage parameters and the current parameters of the two direct current power supply systems are consistent.
When the storage battery packs are operated in parallel for a short time, if the voltages of the storage battery packs are not equal, the storage battery pack with low voltage can become the load of the storage battery pack with high voltage, and a large circulation current can be generated between the two storage battery packs, so that the batteries are heated, the power supply amount is reduced, the service life of the batteries is reduced, and the storage battery packs with different specifications and types and unmatched capacities are used in parallel, so that the batteries are easily damaged.
Therefore, when the two direct-current power supply systems are designed and selected, the design and selection are carried out on the basis of the short-time parallel operation conditions, so that before one direct-current power supply system in the two direct-current power supply systems breaks down and exits from operation, the control buses and the closing buses of the two direct-current power supply systems can be operated in parallel for a short time, and then the broken direct-current power supply is cut off, so that the requirement that the direct current does not interrupt power supply when the two direct-current power supply systems are switched is met; meanwhile, the replacement of spare parts can be realized when the direct-current power supply system is subjected to fault maintenance.
Optionally, the utility model relates to an embodiment, three-phase low-voltage circuit breaker is plastic casing formula direct current circuit breaker. Further alternatively, the three-phase low-voltage circuit breaker is a plastic case type direct current circuit breaker with the model number GM 225M-2320R.
Optionally, the single-core low-voltage cable is 25mm2Single core low pressure copper core cable conductor.
Optionally, the three-core low-voltage cable is 3 × 25mm2Three-core low-voltage copper-core cable.
Optionally, the three-phase low-voltage circuit breaker is mounted on the first dc power supply panel or the second dc power supply panel. This facilitates the installation and operation of the three-phase low-voltage circuit breaker.
It is visible, the utility model relates to an embodiment provides a transformer substation's DC power supply interconnection circuit can break down or unusual and need withdraw from the operation in a certain DC power supply system among two DC power supply system, realizes being supplied power for unusual DC power supply system's direct current load by another normal DC power supply system, and the unstable problem of DC power supply system operation that causes when solving transformer substation's DC power supply system trouble, and required circuit breaker is few, and the wiring is simple, and is easy and simple to handle.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. In addition, "front", "rear", "left", "right", "upper" and "lower" in this document are referred to the placement states shown in the drawings.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (5)
1. A transformer substation DC power supply interconnection circuit, characterized in that, the interconnection circuit is used for realizing the electric interconnection of two DC power supply systems, includes: the three-phase low-voltage circuit breaker, the single-core low-voltage cable and the three-core low-voltage cable;
the first connecting terminal and the second connecting terminal on the power supply side of the three-phase low-voltage circuit breaker are respectively connected with a positive closing bus and a positive control bus of a first direct-current feed screen of the first direct-current power supply system through the single-core low-voltage cable, a third connecting terminal at the power supply side of the three-phase low-voltage circuit breaker is simultaneously connected with a negative closing bus and a negative control bus of the first direct current feed screen through the single-core low-voltage cable, the first connecting terminal and the second connecting terminal on the load side of the three-phase low-voltage circuit breaker are respectively connected with a positive closing bus and a positive control bus of a second direct-current feed screen of the second direct-current power supply system through the three-core low-voltage cable, and a third wiring terminal on the load side of the three-phase low-voltage circuit breaker is simultaneously connected with the negative closing bus and the negative control bus of the second direct-current feed screen through the three-core low-voltage cable.
2. The substation dc power source interconnection circuit of claim 1, wherein the three-phase low-voltage circuit breaker is a plastic case dc circuit breaker.
3. The substation dc power supply interconnection circuit of claim 1, wherein the single core is configured to be connected to a power supplyThe low-voltage cable is 25mm2Single core low pressure copper core cable conductor.
4. The substation dc power interconnection circuit of claim 1, wherein the three-conductor low-voltage cable is 3 x 25mm in length2Three-core low-voltage copper-core cable.
5. The substation dc power tie circuit of claim 1, wherein the three-phase low voltage circuit breaker is mounted on the first dc feed screen or the second dc feed screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022807612.5U CN213846321U (en) | 2020-11-27 | 2020-11-27 | Direct-current power supply interconnection circuit of transformer substation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022807612.5U CN213846321U (en) | 2020-11-27 | 2020-11-27 | Direct-current power supply interconnection circuit of transformer substation |
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| Publication Number | Publication Date |
|---|---|
| CN213846321U true CN213846321U (en) | 2021-07-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022807612.5U Active CN213846321U (en) | 2020-11-27 | 2020-11-27 | Direct-current power supply interconnection circuit of transformer substation |
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| CN (1) | CN213846321U (en) |
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- 2020-11-27 CN CN202022807612.5U patent/CN213846321U/en active Active
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