CN209844638U - Power supply system with high-voltage quick-switching device - Google Patents
Power supply system with high-voltage quick-switching device Download PDFInfo
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- CN209844638U CN209844638U CN201920772962.7U CN201920772962U CN209844638U CN 209844638 U CN209844638 U CN 209844638U CN 201920772962 U CN201920772962 U CN 201920772962U CN 209844638 U CN209844638 U CN 209844638U
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Abstract
The utility model belongs to the technical field of high-voltage power supply, in particular to a power supply system with a high-voltage quick-switching device, which comprises a group of transformer substation two-section buses, namely a bus I section and a bus II section, wherein the two sections of buses are connected with a load, the two groups of buses both comprise a PT cabinet, and a current transformer, a lightning arrester and a bus residual voltage device are arranged in the PT cabinet; a quick-cutting device is arranged between the first section of the bus and the second section of the bus, and two ends of a secondary system of the quick-cutting device are respectively connected with two sections of output buses of the transformer substation through an isolation cabinet. The technical scheme of the utility model through set up the fast device of cutting between two sections generating lines of a set of transformer substation, will cut the popularization and use of device in 10KV system soon, very big improvement whole power supply system's reliability and security, contrast traditional fully automatic switching scheme, realized the technological upgrade of power fast switch over, improved power supply system's stability greatly.
Description
Technical Field
The utility model belongs to the technical field of the high-voltage power supply, particularly, relate to a power supply system with high-pressure is cut device soon.
Background
The large and medium-sized chemical enterprises are frequently in a state of abnormal power failure or short-time power failure (commonly called as 'power failure') caused by the fault or abnormality of the external power grid or the internal power supply network. Due to the particularity of the process flow, the interruption or abnormality of power supply often causes equipment shutdown or idling, process flow interruption or waste generation, sometimes even causes serious consequences such as scrapping of production equipment and the like.
At present, the main method for solving the problem of power supply reliability of industrial enterprises is to supply power by adopting a double-path or multi-path power supply and then assist a spare power automatic switching device. For general industrial enterprises, the spare power automatic switching device can meet the requirements. And in enterprises requiring continuous power supply such as petrifaction and metallurgy, the use effect of the spare power automatic switching is not ideal. The reason is that these enterprises have a large motor load, and due to the existence of motor feedback voltage, from power loss to voltage loss and no voltage, the process of completing the action of the backup power automatic switching lasts for 1-2 seconds or even longer, and the motor is cut off in batches. Restoring the power supply at this time will cause a large self-starting current of the motor, causing a surge to the power supply network. For a 400V system, the low voltage will cause the contactor to trip and the inverter to stop working. The backup power automatic switching does not really play a role in guaranteeing the continuity of power supply.
SUMMERY OF THE UTILITY MODEL
A primary object of the utility model is to provide a power supply system with high pressure is cut device soon to solve current power supply system of enterprise "shake trouble such as electricity" and cause equipment to jump car and system parking, cause the difficult problem of great economic loss for the chemical industry enterprise of continuity production.
In order to solve the problems, the utility model provides a power supply system with a high-voltage quick-switching device, which comprises two sections of buses of a group of transformer substations, namely a bus I section and a bus II section, wherein the two sections of buses are connected with a load and respectively comprise a PT cabinet, and a current transformer, a lightning arrester and a bus residual voltage device are arranged in the PT cabinet; a fast cutting device is arranged between the first section of the bus and the second section of the bus, and two ends of a secondary system of the fast cutting device are respectively connected with two sections of output buses of the transformer substation through an isolation cabinet.
Furthermore, the fast switching device contains three groups of fast switches, including a first fast switch installed on the first section of the bus, a second fast switch installed on the second section of the bus, and a third fast switch located between the first section of the bus and the second section of the bus.
Further, the quick-switching device comprises manual starting, protection starting, displacement starting, voltage-loss starting, no-current starting and reverse power starting.
Furthermore, the first fast switch, the second fast switch and the third fast switch are mutually locked, the first fast switch and the third fast switch are simultaneously closed to supply power to the I section of the transformer substation bus, the second fast switch and the third fast switch are simultaneously closed to supply power to the II section of the transformer substation bus, and when the first fast switch and the second fast switch are simultaneously closed, the two power supplies are in split operation and are mutually standby.
The utility model has the advantages that: the technical scheme of the utility model through set up the fast device of cutting between a set of transformer substation both ends generating line, will cut the popularization and use of device in 10KV system soon, very big improvement whole power supply system's reliability and security, contrast traditional fully automatic switching scheme, realized the technological upgrade of power fast switch-over, improved power supply system's stability greatly.
Drawings
In the drawings:
fig. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of the single bus bar sectional operation of the present invention;
FIG. 3 illustrates the switching between various starting modes and operating states of the present invention;
in the figure, 1 is a current transformer, 2 is a bus residual voltage device, 3 is a single-phase transformer, 4 is a lightning arrester, 5 is a first section of a transformer substation bus, 6 is an isolation cabinet, and 7 is a second section of the transformer substation bus.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
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 terms so used are interchangeable under appropriate circumstances for describing embodiments of the invention 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 shown in fig. 1 to 3, a power supply system with a high-voltage fast switching device comprises a set of two sections of transformer substation buses, namely a first section 5 of the transformer substation bus and a second section 7 of the transformer substation bus, wherein the first section 5 of the transformer substation bus comprises a three-phase transformer and a single-phase transformer, and the second section 7 of the transformer substation bus also comprises a three-phase transformer and a single-phase transformer. Specifically, an output bus of a first section 5 of the transformer substation bus is defined as a first bus, an output bus of a second section 7 of the transformer substation bus is defined as a second bus, each of the two sections of the transformer substation bus comprises a PT cabinet, and a current transformer 1, a lightning arrester 4 and a bus residual voltage device 2 are arranged in the PT cabinet; between I section 5 of transformer substation's generating line and the output bus of II sections 7 of transformer substation's generating line, be provided with the fast device that cuts promptly between first generating line and the second generating line promptly, the both ends of cutting the device secondary system soon are connected with first generating line and second generating line through isolation cabinet 6 respectively.
The fast switching device comprises three groups of fast switches, namely a first fast switch 1DL arranged on a first section 5 of a transformer substation bus, a second fast switch 2DL arranged on a second section 7 of the transformer substation bus and a third fast switch 3DL arranged between the first section 5 of the transformer substation bus and the second section 7 of the transformer substation bus.
The quick switching device comprises starting modes such as manual starting, protection starting, displacement starting, decompression starting, no-flow starting and reverse power starting, and specifically comprises the following steps: the manual starting mode is used for service of the incoming line or service of the incoming line after fault recovery, and the switching function of the device is started manually through the opening amount. For the single bus-section operation mode (as shown in fig. 2), the manual start can realize the mutual switching between 1DL and 3DL, and also can realize the mutual switching between 2DL and 3 DL.
Protection starting: the quick main protection contact of the power supply equipment such as a line/line transformer group/main transformer is introduced into the quick switching device, and when the system normally operates, once the main protection action of the power supply side is detected, the quick switching device immediately starts switching, disconnects a fault line and puts a standby power supply into operation.
And (3) displacement starting: when the system normally operates, if the switch in the closed position is tripped and no current flows in the incoming line, the device starts to switch, and the power supply on the other side is switched on to ensure the power supply of the bus.
Starting under a condition of no voltage: when the three-phase voltage of the bus is detected to be lower than the voltage loss starting setting value and no current flows in the incoming line, the switching function is started through the setting delay device. The start-up mode can be controlled by the control word in the constant value.
No-flow start: when the device detects that the incoming current is from flowing (larger than a no-flow starting setting value) to no-flow (smaller than a no-flow starting setting value) and the bus frequency is smaller than a no-flow starting frequency fixed value, the device starts a switching function through setting delay. The no-flow start mode is mainly used for the situation that the incoming line home side protection cannot access the device. When the incoming line fails and is tripped by other protection (possibly the opposite side protection), the incoming line current necessarily tends to decrease, and the frequency also decreases. The starting mode can be started or stopped through the control word.
Starting with reverse power: when the quick protection contact starting device without the incoming line is switched, the starting criterion can be used for realizing quick switching under the condition of a fault, and the time needs to be set to be the action time of main protection of an adjacent line plus the tripping time of the incoming line switch at least. The reverse power element is activated when the following logic is satisfied. The phase current is reversed (the current flowing from the inlet wire to the bus is defined as the positive current direction); the phase current is greater than 0.1A; the line voltage is less than the reverse power voltage threshold. In the single-bus section operation mode and the single-bus operation mode, the switching device (as shown in fig. 3) between various starting modes and operation states operates the working power switch and the standby power switch according to a certain sequence after starting. In the fast switching principle, the term "switching pattern" is used to describe the sequence of different switching operations. The switching mode provided by the device comprises the following steps: parallel, series and simultaneous modes. Parallel switching: the parallel switching can only be triggered by manual actuation. Take parallel switching from 1DL to 3DL as an example. After manual starting, if the parallel condition is satisfied (the conditions are that the frequency difference, the phase difference and the pressure difference on two sides of the switch are respectively smaller than the fixed value parallel switching frequency difference, the parallel switching phase difference and the parallel switching pressure difference), the device firstly closes the 3DL switch, then the two power supplies of the inlet wire 1 and the inlet wire 2 are in parallel for a short time, and the device jumps out of 1DL after setting delay (parallel trip delay). If the 3DL just closed is tripped during this time delay (if the protection operation trips 3 DL), the switching is completed, and the apparatus does not trip 1DL any more, so as to prevent the power failure range from being expanded. If the 1DL is rejected, the device will trip the 3DL switch to avoid the two power supplies being paralleled for a long time. If the parallel switching condition is not satisfied after the manual starting, the device is immediately locked and enters a waiting reset state. The parallel switching mode is suitable for switching between two power supplies of a same-frequency system under normal conditions, and can be used for manual switching or manual recovery after failure during incoming line maintenance. Series switching: take the example of switching from 1DL to 3 DL. After the device is started, the 1DL switch is firstly tripped, and after the 1DL tripping is confirmed, a 3DL command of closing the bus coupler switch is sent according to the closing condition. If the 1DL rejects, the handover process is ended and the device no longer closes the 3 DL. Series switching is mostly used for automatic switching in case of accidents. The series switching can be achieved by the following switching-on modes (also called implementation modes): fast switching, synchronous capture switching, residual voltage switching and long delay switching. When the fast switching condition is not satisfied, the judgment of the switching conditions such as synchronous capture, residual voltage, long time delay and the like can be automatically carried out. And simultaneously switching: take the example of switching from 1DL to 3 DL. After the start-up of the device is completed,
firstly, a 1DL switching-off command is sent out, then a set simultaneous switching-on delay is carried out, and then a 3DL switching-on command is sent out according to a switching-on condition. If the 1DL finally rejects, the device will trip the 3DL switch to avoid the two power supplies being paralleled for a long time. Meanwhile, compared with the series switching, the switching does not need to confirm that the 1DL is tripped and then judge the 3DL closing condition, and the 3DL closing condition can be judged only through a delay, so that the bus outage time is shortened as much as possible.
The foregoing detailed description has provided for the present application and the principles and embodiments of the present application can be illustrated by specific examples, which are provided only for the purpose of facilitating understanding of the method and the core concept of the present application, and persons skilled in the art may change the embodiments and application scope according to the concept of the present application.
Claims (4)
1. The utility model provides a power supply system with high pressure cuts device soon, includes two sections generating lines of a set of transformer substation, is I section of generating line and II sections of generating line respectively, is connected with load, its characterized in that on two sections generating lines: the two sections of buses comprise a PT cabinet, and a current transformer, a lightning arrester and a bus residual voltage device are arranged in the PT cabinet; a fast cutting device is arranged between the first section of the bus and the second section of the bus, and two ends of a secondary system of the fast cutting device are respectively connected with two sections of output buses of the transformer substation through an isolation cabinet.
2. The power supply system with high voltage fast switching device according to claim 1, wherein: the fast switching device comprises three groups of fast switches, namely a first fast switch arranged on the first section of the bus, a second fast switch arranged on the second section of the bus and a third fast switch positioned between the first section of the bus and the second section of the bus.
3. The power supply system with high voltage fast switching device according to claim 2, wherein: the quick switching device comprises manual starting, protection starting, deflection starting, decompression starting, no-current starting and reverse power starting.
4. The power supply system with high voltage fast switching device according to claim 3, wherein: the first fast switch, the second fast switch and the third fast switch are mutually locked and controlled, the first fast switch and the third fast switch are simultaneously closed to supply power to the I section of the transformer substation bus, the second fast switch and the third fast switch are simultaneously closed to supply power to the II section of the transformer substation bus, and when the first fast switch and the second fast switch are simultaneously closed, two power supplies are in split operation and are mutually standby.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920772962.7U CN209844638U (en) | 2019-05-27 | 2019-05-27 | Power supply system with high-voltage quick-switching device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920772962.7U CN209844638U (en) | 2019-05-27 | 2019-05-27 | Power supply system with high-voltage quick-switching device |
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| CN209844638U true CN209844638U (en) | 2019-12-24 |
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| CN201920772962.7U Active CN209844638U (en) | 2019-05-27 | 2019-05-27 | Power supply system with high-voltage quick-switching device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116317091A (en) * | 2023-05-16 | 2023-06-23 | 南瑞轨道交通技术有限公司 | Method, system, computer equipment and storage medium for switching power supply |
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2019
- 2019-05-27 CN CN201920772962.7U patent/CN209844638U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116317091A (en) * | 2023-05-16 | 2023-06-23 | 南瑞轨道交通技术有限公司 | Method, system, computer equipment and storage medium for switching power supply |
| CN116317091B (en) * | 2023-05-16 | 2023-10-13 | 南瑞轨道交通技术有限公司 | Method, system, computer equipment and storage medium for switching power supply |
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