CN214124818U - Switch protection device for power source system for transformer substation - Google Patents
Switch protection device for power source system for transformer substation Download PDFInfo
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- CN214124818U CN214124818U CN202022177626.3U CN202022177626U CN214124818U CN 214124818 U CN214124818 U CN 214124818U CN 202022177626 U CN202022177626 U CN 202022177626U CN 214124818 U CN214124818 U CN 214124818U
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Abstract
The utility model discloses a switch protection device for power source system for transformer substation, include: the main control system comprises at least one first current acquisition module, at least one shunt release and a main control module; the input end of each first current acquisition module is connected between the bus and each second switch, the output end of each first current acquisition module is connected with the main control module, each shunt release is connected with the main control module, and each shunt release is arranged at each second switch and drives each second switch to be tripped; when the switching protection device is used for the first-stage line group, the switching protection device further comprises: each first electric operation module is connected with the main control module, and is arranged at each first switch to drive each first switch to be switched on and off. The device can accurately identify the output short-circuit current characteristic of the power source and quickly cut off the fault feed-out line.
Description
Technical Field
The utility model relates to a switch protection technical field especially relates to a switch protection device for power source system for transformer substation.
Background
The power source system for the transformer substation provides a power source for important equipment such as a monitoring system computer, measurement and control equipment, a relay protection device, a safety automatic device, emergency lighting, an emergency power source, breaker opening/closing operation and the like and related operations, and is an important component of the transformer substation.
In a power source system for a substation, power electronic devices such as a thyristor (SCR), a bipolar power transistor (GTR), a Metal Oxide Semiconductor Field Effect Transistor (MOSFET), or an Insulated Gate Bipolar Transistor (IGBT) are commonly used for an alternating current uninterruptible power source system (UPS) and a direct current power source system. These power electronic devices have a short-circuit endurance time, and the short-circuit output of an overcurrent may cause the devices to burn out due to power loss. Therefore, the power source taking the power electronic device as the core is provided with an output current-limiting protection circuit, when output overcurrent or short-circuit fault occurs, as long as the short-circuit current is detected to reach the repeated peak current of the power electronic device, the output drive is immediately closed, and the pin is removed to drive locking after the current is reduced, so that the power is continuously output to the outside. If the output overcurrent or short circuit fault cannot be eliminated, the process is repeated for a plurality of times, and then the output of the power source is closed by the software driving program.
The protection of the feed-out line of the power electronic power source is generally realized by the electromagnetic tripping characteristic and the thermal tripping characteristic of the air switch. The principle of electromagnetic tripping is that when the current is large enough, the generated magnetic field force overcomes the counter-force spring, and the attracting armature iron strikes the traction rod, so that the mechanism is driven to act to cut off the circuit. The principle of thermal tripping is that current passes through a thermal element of the tripper, the thermal element is heated and deformed to a certain degree, and a traction rod is struck, so that a mechanism is driven to act to cut off a circuit.
The feed-out line of the power electronic power source generally adopts a radial wiring mode, namely, the power source supplies power to a bus of a feeder cabinet, and a plurality of branch feeder lines are connected from the bus of the feeder cabinet to each power load. According to the requirements of concrete engineering, it also can adopt the radial wiring mode of two-stage branch sub-feeder, i.e. the power source can be used for supplying power to main feeder screen (I-stage) bus, and several return branch feeders are connected from main feeder screen bus to branch feeder screen (II-stage) bus, and then several return branch feeders are connected from branch feeder screen bus to electric load.
In actual operation, the feeder line protection of the power electronic power source has the following problems:
when the feed-out line has overcurrent or short-circuit fault, under the control action of the power source output current-limiting protection circuit, the output current of the power electronic power source is generally not enough to enable the air switch to trip, and even if the short-circuit current reaches the tripping condition of the air switch, the tripping response speed of the power electronic power source is usually several seconds to tens of seconds and is far lower than the response speed of the power source output current-limiting protection. When a short-circuit fault occurs on a certain feedback outgoing line, the air switch of the feedback outgoing line cannot be opened in time, and the power electronic power source locks power output, so that the voltage of the whole bus is lost, and the power failure range is expanded.
For the multi-stage branch sub-feeder connection mode, each stage of air switch needs to be reasonably selected and configured according to a certain step difference, but in actual operation, because of differences of manufacturers, model specifications, production batches and even individual characteristics of products, each stage of air switch is difficult to meet the matching requirements of the step difference in design on indexes such as action time, breaking capacity, current limiting capacity, protection characteristics, service life and the like. When the feed-out line has overcurrent or short circuit fault, the upper and lower air switches act simultaneously to override trip, so that the power failure range is expanded.
Therefore, how to quickly and accurately isolate the fault feeder line, effectively avoiding the power output shutdown caused by the output short circuit locking of the power electronic power source, realizing the matching of the protection level differences of the feeder switch on the power source system level for the station, and preventing the power failure range from expanding becomes a problem to be solved by technical personnel in the field.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides a switch protection device for power source system for transformer substation to solve prior art and can't accurate isolation fault present the line fast, can not effectively avoid the problem of closing because of the power output that power electronic power source output short circuit shutting leads to.
The embodiment of the utility model discloses following technical scheme:
a switch protection device for a power source system for a substation, the power source system for a substation comprising: at least one power source, at least one first switch, and at least one stage of line groups, each stage of the line group comprising: the bus is connected with each feed-out line through each second switch, when the line group is a first-level line group, the output end of each power source is connected with the bus of the first-level line group through each first switch, when the line group is not the first-level line group, the bus of one line group is connected with one feed-out line of the first-level line group, and each line group corresponds to each switch protection device; the switch protection device includes: the main control system comprises at least one first current acquisition module, at least one shunt release and a main control module; the input end of each first current acquisition module is connected between the bus and each second switch, the output end of each first current acquisition module is connected with the main control module, each shunt release is connected with the main control module, and each shunt release is arranged at each second switch and used for driving each second switch to be tripped; when the switching protection device is used for the first stage line group, the switching protection device further includes: each first electric operation module is connected with the main control module, and is arranged at each first switch and used for driving each first switch to be switched on and off.
Further, the main control module comprises: and each tripping open contact is connected with each shunt release.
Further, the main control module comprises: and when the switch protection device is used for the first-level line group, each first latching-out contact is connected with each first electric operation module.
Further, the switch protection device further includes: each second electric operation module is connected with the main control module, and each second electric operation module is arranged at each second switch and used for driving each second switch to be conducted.
Further, the main control module comprises: the secondary locking signal receiving unit is connected with the first locking and unlocking contact of the switch protection device of the next stage, each second locking and unlocking contact is connected with each second electric operation module, and each switch protection device of the next stage corresponds to each line group of the next stage.
Further, when the switching protection device is used for the first stage line group, the switching protection device further includes: and the output end of each second current acquisition module is connected with the main control module.
Further, the switch protection device further includes: the input end of the voltage acquisition module is connected with the bus, and the output end of the voltage acquisition module is connected with the main control module.
Further, the switch protection device further includes: and each second switch is provided with one switch state acquisition module, when the switch protection device is used for a first-level line group, each first switch is also provided with one switch state acquisition module, and the switch state acquisition module is connected with the main control module.
Further, the switch protection device further includes: and the alarm module is connected with the main control module.
Further, the switch protection device further includes: and the display module is connected with the main control module.
The utility model discloses a switch protection device for power source system for transformer substation can accurate discernment power source output short-circuit current characteristic, and quick judgement and excision trouble are presented and are qualified for the next round of competitions to accurate isolation trouble is presented and is qualified for the next round of competitions, avoids power electronic power source output shutting and air switch tripping operation more than grade, prevents because of power electronic power source output shutting and present the power failure scope extension accident that air switch tripping operation more than grade leads to of being qualified for the next round of competitions.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention 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 for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic structural diagram of a power source system for a substation according to a preferred embodiment of the present invention;
fig. 2 is a schematic structural diagram of a power source system for a substation according to another preferred embodiment of the present invention;
fig. 3 is a block diagram of a switch protection device for a power source system for a substation according to a preferred embodiment of the present invention;
fig. 4 is a block diagram of a switch protection device for a power source system for a substation according to another preferred embodiment of the present invention;
fig. 5 is a schematic configuration diagram of a switch protection device for a power source system for a substation according to embodiment 1 of the present invention;
fig. 6 is a schematic diagram of a trip circuit and a lockout circuit of a switch protection device configuration for a power source system for a substation according to embodiment 1 of the present invention;
fig. 7 is a schematic configuration diagram of a switch protection device for a power source system for a substation according to embodiment 2 of the present invention;
fig. 8 is a schematic diagram of a trip circuit and a lockout circuit of a switch protection device configuration for a power source system for a substation according to embodiment 2 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 1 and 2, the power source system for a transformer substation according to the embodiment of the present invention includes: at least one power source 1, at least one first switch 2 and at least one stage of line group. Each stage of the line group includes: a bus 3, at least one feed-out line 4 and at least one second switch 5. The bus bar 3 is connected with each feed-out line 4 through each second switch 5. The first switch 2 and the second switch 5 are both air switches. As shown in fig. 1, when the line group is a first-stage line group, the output end of each power source 1 is connected to the bus bar 3 of the first-stage line group through each first switch 2. As shown in fig. 2, when the line group is not the first-stage line group, the bus bar 3 of one line group is connected to a feeding line 4 of the first-stage line group. It should be understood that when a line group is not a first-level line group, the present-level line group may include a plurality of line groups. It should be understood that the feeder line 4 of the upper-stage line group may be connected with the lower-stage line group, or may not be connected with the lower-stage line group. When the feeding line 4 of one line group is connected to the bus 3 of another line group, the two line groups form the upper and lower line groups according to the embodiment of the present invention. Each line group of each stage corresponds to each switch protection device no matter which stage the line group is.
The embodiment of the utility model discloses a switch protection device for power source system for transformer substation. Specifically, as shown in fig. 3 and 4, the switch protection device according to the embodiment of the present invention includes: at least one first current collection module 6, at least one shunt release 7 and a main control module 8. The number of the first current collection modules 6 is the same as the number of the feed-out lines 4 of the line group corresponding to the switch protection device. The shunt release 7 has the same number of second switches 5 as the line group corresponding to the switch protection device.
The input end of each first current collection module 6 is connected between the bus 3 and each second switch 5, and the output end of each first current collection module 6 is connected with the main control module 8. The first current collecting module 6 is configured to collect a current flowing through the feeding line 4, and send the current flowing through the feeding line 4 to the main control module 8.
Each shunt release 7 is connected with a main control module 8. Each shunt release 7 is provided at each second switch 5 for driving each second switch 5 to trip. The shunt release 7 has high action speed and can quickly isolate the fault feed-out line.
When the switching protection device is used for the first-stage line group, the switching protection device further includes: a first electrically operated module 9. The first electrically operated modules 9 are the same number as the first switches 2. Each first electric operation module 9 is connected with the main control module 8. Each first electric operation module 9 is arranged at each first switch 2 and used for driving each first switch 2 to be switched on and off.
Through the structural design, the first current collecting module 6 collects the current flowing through the feed-out line 4. The main control module 8 can judge whether the feeding-out line 4 is in fault according to the current collected by the first current collecting module 6. Specifically, the failure determination may be performed in a common manner. When the current of the feeding-out line 4 is greater than the overcurrent fixed value and the duration time is greater than the overcurrent delay fixed value, the main control module 8 judges that the feeding-out line 4 has overcurrent fault. When the sudden change amount of the current of the feeding-out line 4 is greater than the sudden change threshold and the sudden change time has the power frequency characteristic (for example, the interval of n continuous sudden change times is 10ms), the main control module 8 determines that the feeding-out line 4 has a short-circuit fault. The abrupt change amount can be obtained by subtracting the current values of two adjacent sampling moments. When the feeder line 4 has a fault, the output current-limiting protection of the power electronic power source is triggered, the main control module 8 controls the shunt release 7 on the feeder line 4 to rapidly trip off the second switch 5 on the feeder line 4, and before the software program of the power source 1 closes the power output, the feeder line 4 is isolated from the system, so that the output locking of the power source 1 is avoided. Meanwhile, when the switch protection device is used for a first-stage line group, the main control module 8 controls the first electric operation module 9 to lock the first switch 2 at the output end of the power source 1, so that uninterrupted power supply of the system is ensured, and normal operation of other feed-out lines 4 is maintained.
Specifically, the main control module 8 includes: at least one trip out contact 81. The trip open contacts 81 are the same number as the shunt release 7. Each trip open contact 81 is connected to each shunt release 7. The main control module 8 includes: at least one first latch-out contact 82. When the switch protection device is used in the first stage line set, each first latching outlet contact 82 is connected to each first electrically operated module 9.
Through the structural design, when the feeder line 4 has the fault, the main control module 8 controls the trip open contact 81 corresponding to the feeder line 4 to be closed, so that a trip signal is output to the corresponding shunt release 7, and the shunt release 7 quickly opens the second switch 5 on the feeder line 4. Meanwhile, the main control module 8 controls the first latching and opening contact 82 corresponding to the first switch 2 in the closed state to be closed, so as to send a latching signal to the first electrically operated module 9, and enable the first electrically operated module 9 to latch the first switch 2 at the output end of the power source 1.
Preferably, the switch protection device further includes: at least one second electrically operated module 10. The number of the second electric operation modules 10 and the second switches 5 is the same. Each second electrically operated module 10 is connected to the main control module 8. Each second electric operating module 10 is disposed at each second switch 5 for driving each second switch 5 to be turned on.
Preferably, the main control module 8 includes: a secondary latching signal receiving unit 83 and at least a second latching open contact 84. The secondary latching signal receiving unit 83 is connected to the first latching open contact 82 of the next stage of switching protection. That is, when the switch protection device does not correspond to the first-stage line group, the first latching and releasing contact 82 is not connected to the first electric operation module 9 (therefore, the connection relationship between the two is shown by a dotted line in fig. 4), but is connected to the secondary latching signal receiving unit 83 of the previous-stage switch protection device, and the number of the first latching and releasing contacts 82 of the switch protection device is one. Each second latching and unlatching contact 84 is connected to each second electrically operated module 10. Each switch protection device of the next stage corresponds to each line group of the next stage.
Through the above structural design, when a feeder line 4 of a next-stage line group fails, the next-stage switch protection device corresponding to the next-stage line group controls the shunt release 7 of the feeder line 4 to rapidly trip off the second switch 5 on the feeder line 4 according to the above process, so as to isolate the feeder line 4 from the system, which is not described herein again. Meanwhile, the main control module 8 of the next stage of switch protection device controls the first latching open contact 82 of itself to be closed, and sends a latching signal to the secondary latching signal receiving unit 83 of the main control module 8 of the previous stage of switch protection device. If the previous-stage switch protection device does not correspond to the first-stage line group, the main control module 8 of the previous-stage switch protection device controls each second latching and opening contact 84 of the previous-stage switch protection device to be closed according to the latching signal, and drives each corresponding second electric operation module 10 to latch each second switch 5; if the previous-stage switch protection device corresponds to the first-stage line group, the main control module 8 of the previous-stage switch protection device controls each first latching and unlocking contact 82 and each second latching and unlocking contact 84 of the previous-stage switch protection device to be closed according to the latching signal, drives each corresponding first electric operation module 9 to latch the first switch 2 at the output end of the power source 1, and latches each second switch 5 through each corresponding second electric operation module 10; thereby ensuring the uninterrupted power supply of the power source 1 and maintaining the normal operation of the present-stage feed-out line 4 and the corresponding next-stage feed-out line 4.
Preferably, when the switching protection device is used for the first-stage line group, the switching protection device further includes: at least one second current collecting module 11. The input end of each second current collection module 11 is connected between the output end of each power source 1 and each first switch 2. The output end of each second current collection module 11 is connected with the main control module 8. The second current collecting module 11 may collect the current output by the power source 1 and send the current value to the main control module 8. The main control module 8 can judge whether the current value is abnormal or not according to the current value, so as to perform corresponding alarm and control corresponding switch action.
Preferably, the switch protection device further includes: and a voltage acquisition module 12. The input of the voltage acquisition module 12 is connected to a bus bar 3 (it should be understood that the bus bar 3 is the bus bar 3 of the line group to which the switch protection device corresponds). The output end of the voltage acquisition module 12 is connected with the main control module 8. The voltage acquisition module 12 is used for acquiring the voltage on the bus 3 and sending the voltage value to the main control module 8. The main control module 8 can judge whether the abnormality occurs according to the voltage value, so as to perform corresponding alarm and control corresponding switch action.
Preferably, the switch protection device further includes: and a switch state acquisition module 13. And a switch state acquisition module 13 is arranged at each second switch 5. When the switch protection device is used for the first-stage line group, a switch state acquisition module 13 is also arranged at each first switch 2. The switch state acquisition module 13 is connected with the main control module 8. The switch state acquisition module 13 is configured to acquire a state (disconnection or connection) of the connected first switch 2 or the connected second switch 5, and send the state to the main control module 8, and the main control module 8 determines whether the current state is abnormal, so as to perform corresponding alarm and control on corresponding switch actions.
Preferably, the switch protection device further includes: an alarm module 14. The alarm module 14 is connected with the main control module 8. When the main control module 8 determines that the feeding-out line 4 of the line group in which the main control module is located has a fault, the current value of the output end of the power source 1 is abnormal, the voltage of the bus 3 is abnormal, the state of the first switch 2 is abnormal, the state of the second switch 5 is abnormal, and the like, the main control module 8 can control the alarm module 14 to alarm so as to prompt a worker.
Preferably, the switch protection device further includes: a display module 15. The display module 15 is connected with the main control module 8. The display module 15 may display various data transmitted from the main control module 8, for example, information such as a voltage current value, a switching value input/output state, an operation alarm event, and the like.
The technical solution of the present invention is further explained by the following specific embodiments.
Example 1
Fig. 5 is a typical configuration of an ac uninterruptible power supply system (UPS) for a substation, with only a first-stage line group. Wherein source UPS1 and source UPS2 are two identically configured power electronic power sources. The first switch Q1 and the first switch Q2 are power source output end air switches. In normal operation, only one of the first switch Q1 and the first switch Q2 is in a closed state. The feeding-out lines L11-L18 are connected in a radiation mode and are connected to the same bus B1, and the second switches Q11-Q18 are air switches of the feeding-out lines L11-L18 respectively.
Second current collection modules C1 and C2 are respectively arranged at an output end LH1 of the power source UPS1 and an output end LH2 of the power source UPS2, and are used for collecting the total current output by the power sources UPS1 and UPS 2. First current collection modules C11-C18 are respectively arranged at feeding lines L11-L18 between the bus B1 and the second switches Q11-Q18 to obtain currents of the feeding lines L11-L18. Specifically, LH11 to LH18 are respectively installation positions of the first current collection modules C11 to C18 of the respective feeding lines L11 to L18. The respective collected current values are input to the main control module MC 1.
A first electrically operated module M1 is provided at the first switch Q1 at the output of the power source UPS1, and a first electrically operated module M2 is provided at the first switch Q2 at the output of the power source UPS 2. And shunt release devices T11 to T18 are respectively arranged on the second switches Q11 to Q18 of the feed-out lines L11 to L18.
As shown in fig. 6, trip open contacts K11 to K18 of the main control module MC1 are connected to shunt release T11 to T18, respectively, to form a feed-out line protection trip circuit. The first latching open contacts BLK1 and BLK2 of the master control module MC1 are connected to the first electric operation modules M1 and M2, respectively, to form a power source output trip latching loop.
Assuming that a closed power source is the UPS1 in normal operation, taking the feeder line L11 as an example of a fault, when the master control module MC1 determines that the feeder line L11 has an overcurrent or short-circuit fault and triggers power source output current limiting protection, the main control module MC1 closes the trip-out contact K11 of the feeder line L11 to drive the shunt release T11 installed at the second switch Q11 of the feeder line L11 to operate, and quickly trips off the second switch Q11 of the feeder line L11 through the shunt release T11. Before the software program of the power electronic power source shuts down the power output, the failed feed-out line L11 is isolated from the system, thereby preventing the power source UPS1 output from latching. Meanwhile, the master control module MC1 outputs a blocking signal to the first blocking open contact BLK1 to close the first blocking open contact BLK1, and drives the first electric operation module M1 at the first switch Q1 at the output end of the power source UPS1 to operate, so that the first electric operation module M1 blocks the first switch Q1 at the output end of the power source UPS1, thereby ensuring uninterrupted power supply of the system and maintaining normal operation of other feeding lines L12-L18.
Example 2
As shown in fig. 7, the feeding line is a two-stage branch sub-feeder radial connection. The first stage of line groups are located on the main feeder screen. The second-stage line group is located on the branch feeder screen. The power source UPS1 is connected with the bus B1 of the first-stage line group, and the bus B1 is connected with the feed-out lines L11-L13. The output of the power source UPS1 is connected to a first switch Q1, which is an air switch. The feed-out lines L11-L13 are connected with second switches Q11-Q13 which are air switches. The feed-out line L11 is connected with the bus B2 of the second-stage line group. The bus B2 is connected with each feed-out line L21-L22. The feed-out lines L21-L22 are connected with second switches Q21-Q22.
Specifically, the switch protection device corresponding to the first-stage line group is provided with a second current collection module C1 at the output end LH1 of the power source UPS1, and collects the total current output by the power source UPS 1. First current collection modules C11-C13 are arranged at first switches Q1 of the feeding lines L11-L13, and are used for collecting currents of the feeding lines L11-L13. Specifically, LH11 to LH13 are respectively installation positions of the first current collection modules C11 to C13 of the feeding lines L11 to L13. And the collected current values are input into a main control module MC1 of the switch protection device corresponding to the first-stage line group.
A first electric operation module M1 of a switch protection device corresponding to the first-stage line group is arranged at a first switch Q1 at the output end of the power source UPS 1. Shunt release T11-T13 and second electric operation modules M11-M13 of the switch protection device corresponding to the first-level line group are respectively arranged at the second switches Q11-Q13 of the feed-out lines L11-L13.
As shown in fig. 8, the first trip switch-out contacts 1-K11-1-K13 of the main control module MC1 and the shunt release T11-T13 installed at the second switches Q11-Q13 of the respective feeder lines L11-L13 form a feeder line protection trip circuit. The first latching open contact 1-BLK1 of the master control module MC1 and the first electrically operated module M1 installed at the first switch Q1 at the output of the power source UPS1 constitute a power source output trip latching loop. The second latching open contacts 1-BLK 11-1-BLK 13 of the main control module MC1 and the second electric operation modules M11-M13 arranged at the second switches Q11-Q13 of the feed-out lines L11-L13 respectively form a tripping latching loop of the feed-out lines L11-L13.
The switch protection device corresponding to the second-level line group is respectively provided with a first current collection module C21-C23 at the second switch Q21-Q22 of each feed-out line L21-L22, and collects the current of each feed-out line L21-L22. Specifically, LH21 to LH22 are installation positions of the first current collection modules C21 to C22 of the respective feeding lines L21 to L22. And inputting the acquired current values into a main control module MC2 of the switch protection device corresponding to the second-stage line group.
A shunt release T21 of a switch protection device corresponding to the second-stage line group is arranged at a second switch Q21 of the feed-out line L21, and a trip-out point 2-K11 of the main control module MC2 and the shunt release T21 form a protection trip-out loop of the feed-out line L21. A shunt release T22 of a switch protection device corresponding to the second-stage line group is arranged at a second switch Q22 of the feed-out line L22, and a trip-out point 2-K12 of the main control module MC2 and the shunt release T22 form a protection trip-out loop of the feed-out line L22. The first latching open contact 2-BLK1 of the master control module MC2 is connected to the secondary latching signal receiving unit S1 of the master control module MC1, so that a latching signal is output to the secondary latching signal receiving unit S1 of the master control module MC1, and the first switch Q1 and the second switches Q11-Q13 are latched by the switch protection devices corresponding to the first-stage line group.
Taking the fault of the feeding-out line L11 as an example, the master control module MC1 determines that the feeding-out line L11 has an overcurrent or short-circuit fault and triggers the power source output current-limiting protection, and at the same time, the first latching open-out contact 2-BLK1 from the next stage of the feeding-out line L11 does not open the secondary latching signal, then the tripping open-out contact 1-K11 of the feeding-out line L11 is closed, the shunt release T11 installed at the second switch Q11 of the feeding-out line L11 is driven to act, and the second switch Q11 of the feeding-out line L11 is quickly tripped through the shunt release T11. Before the software program of the power electronic power source shuts down the power output, the failed feed-out line L11 is isolated from the system, thereby preventing the power source UPS1 output from latching. Meanwhile, the master control module MC1 outputs a blocking signal to the first blocking output contact 1-BLK1, so that the first blocking output contact 1-BLK1 is closed, and the first electric operation module M1 at the first switch Q1 at the output end of the power source UPS1 is driven to operate, so that the first electric operation module M1 blocks the first switch Q1 at the output end of the power source UPS1, thereby ensuring that the power source UPS1 supplies power uninterruptedly and maintaining the normal operation of other output lines L12-L13.
Taking the branch feeding-out line L21 as an example of a fault, if the main control module MC2 of the switch protection device corresponding to the second line group determines that the feeding-out line L21 has an overcurrent or short-circuit fault, the tripping-out output point 2-K11 of the feeding-out line L21 is closed, the shunt release T21 installed at the second switch Q21 of the feeding-out line L21 is driven to operate, the second switch Q21 of the feeding-out line L21 is quickly tripped through the shunt release T21, and the faulty feeding-out line L21 is isolated from the system. At the same time, the master control module MC2 outputs the latch signal to the first latch-out contact 2-BLK1, so that the first latch-out contact 2-BLK1 is closed, thereby outputting the latch signal to the secondary latch signal receiving unit S1 of the master control module MC1 of the previous stage of the switch protection device. The master control module MC1 outputs a blocking signal to the first blocking and releasing contact 1-BLK1 and the second blocking and releasing contacts 1-BLK 11-1-BLK 13, so that the first blocking and releasing contact 1-BLK1 and the second blocking and releasing contacts 1-BLK 11-1-BLK 13 are closed, the first switch Q1 at the output end of the power source UPS1 and the second switches Q11-Q13 of the feeding lines L11-L13 are blocked, uninterrupted power supply of the power source UPS1 is guaranteed, and normal operation of the feeding lines L11-L13 and branch feeding lines thereof is maintained.
To sum up, the utility model discloses a switch protection device for power source system for transformer substation can accurate discernment power source output short-circuit current characteristic, and quick judgement and excision trouble are presented and are qualified for the next round of competitions to accurate isolation trouble is presented and is qualified for the next round of competitions, avoids power electronic power source output shutting and air switch trip of stepping over, prevents because of power electronic power source output shutting and the power failure scope extension accident that air switch trip of stepping over leads to of being qualified for the next round of competitions.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A switch protection device for a power source system for a substation, the power source system for a substation comprising: at least one power source, at least one first switch, and at least one stage of line groups, each stage of the line group comprising: the bus is connected with each feed-out line through each second switch, when the line group is a first-level line group, the output end of each power source is connected with the bus of the first-level line group through each first switch, when the line group is not the first-level line group, the bus of one line group is connected with one feed-out line of the first-level line group, and each line group corresponds to each switch protection device; it is characterized in that the preparation method is characterized in that,
the switch protection device includes: the main control system comprises at least one first current acquisition module, at least one shunt release and a main control module; the input end of each first current acquisition module is connected between the bus and each second switch, the output end of each first current acquisition module is connected with the main control module, each shunt release is connected with the main control module, and each shunt release is arranged at each second switch and used for driving each second switch to be tripped;
when the switching protection device is used for the first stage line group, the switching protection device further includes: each first electric operation module is connected with the main control module, and is arranged at each first switch and used for driving each first switch to be switched on and off.
2. The switch protection device for a power source system for a substation according to claim 1, wherein the main control module comprises: and each tripping open contact is connected with each shunt release.
3. The switch protection device for a power source system for a substation according to claim 1, wherein the main control module comprises: and when the switch protection device is used for the first-level line group, each first latching-out contact is connected with each first electric operation module.
4. The switch protection device for a power source system for a substation according to claim 3, characterized by further comprising: and each second electric operation module is connected with the main control module and is arranged at each second switch and used for driving each second switch to be conducted.
5. The switch protection device for a power source system for a substation according to claim 4, wherein the main control module comprises: the secondary locking signal receiving unit is connected with the first locking and unlocking contact of the switch protection device of the next stage, each second locking and unlocking contact is connected with each second electric operation module, and each switch protection device of the next stage corresponds to each line group of the next stage.
6. The switching protection device for a power source system for a substation according to claim 1, wherein when the switching protection device is used for the first-stage line group, the switching protection device further comprises: and the output end of each second current acquisition module is connected with the main control module.
7. The switch protection device for a power source system for a substation according to claim 1, characterized by further comprising: the input end of the voltage acquisition module is connected with the bus, and the output end of the voltage acquisition module is connected with the main control module.
8. The switch protection device for a power source system for a substation according to claim 1, characterized by further comprising: and each second switch is provided with one switch state acquisition module, when the switch protection device is used for a first-level line group, each first switch is also provided with one switch state acquisition module, and the switch state acquisition module is connected with the main control module.
9. The switch protection device for a power source system for a substation according to claim 1, characterized by further comprising: and the alarm module is connected with the main control module.
10. The switch protection device for a power source system for a substation according to claim 1, characterized by further comprising: and the display module is connected with the main control module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022177626.3U CN214124818U (en) | 2020-09-28 | 2020-09-28 | Switch protection device for power source system for transformer substation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022177626.3U CN214124818U (en) | 2020-09-28 | 2020-09-28 | Switch protection device for power source system for transformer substation |
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| CN214124818U true CN214124818U (en) | 2021-09-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112421582A (en) * | 2020-09-28 | 2021-02-26 | 国网宁夏电力有限公司检修公司 | Switch protection device for power source system for transformer substation |
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- 2020-09-28 CN CN202022177626.3U patent/CN214124818U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112421582A (en) * | 2020-09-28 | 2021-02-26 | 国网宁夏电力有限公司检修公司 | Switch protection device for power source system for transformer substation |
| CN112421582B (en) * | 2020-09-28 | 2024-05-24 | 国网宁夏电力有限公司检修公司 | Switch protection device for power source system for transformer substation |
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