CN203871849U - Protection system for spacing T area of main transformer at high-voltage switching station of nuclear power plant - Google Patents
Protection system for spacing T area of main transformer at high-voltage switching station of nuclear power plant Download PDFInfo
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- CN203871849U CN203871849U CN201420291978.3U CN201420291978U CN203871849U CN 203871849 U CN203871849 U CN 203871849U CN 201420291978 U CN201420291978 U CN 201420291978U CN 203871849 U CN203871849 U CN 203871849U
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- 230000003287 optical effect Effects 0.000 claims abstract description 48
- 230000005540 biological transmission Effects 0.000 claims abstract description 14
- 238000002955 isolation Methods 0.000 claims description 50
- 239000013307 optical fiber Substances 0.000 claims description 14
- 239000000835 fiber Substances 0.000 abstract 1
- 230000001681 protective effect Effects 0.000 description 10
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000007363 ring formation reaction Methods 0.000 description 2
- 238000010977 unit operation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000004992 fission Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
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Abstract
The utility model relates to a high-voltage switch for nuclear power plant, more specifically to a protection system for a spacing T area of a main transformer at a high-voltage switching station of a nuclear power plant. The protection system comprises a first bus and a second bus, a plurality of switch blocks which are arranged between the first bus and the second bus and lead out main transformer lines and power transmission lines through 3/2 wiring means, a first CT connected between a first breaker and the first bus, a second CT connected between a second breaker and a third breaker, a third CT connected to the high-voltage side of the main transformer, a short lead protection device connected to the first CT and second CT secondary loops in the switch blocks, a first short-line optical difference protection device connected to loop thereafter, and a second short-line optical difference protection device connected to the third CT. The first short-line optical difference protection device and the second short-line optical difference protection device are connected through fibers. The protection system overcomes the risk due to improper protection action caused by long distance between a switching station and a set, and improves the safety coefficient of the switching station.
Description
Technical field
The utility model relates to a kind of nuclear power plant high-voltage switch gear, relates in particular the protection system in high voltage switchyard main transformer interval T district of a kind of nuclear power plant.
Background technology
Nuclear power plant is the power plant that utilizes the power generation electric energy that nuclear fission or nuclear fusion reaction discharge, nuclear power plant is a kind of high-energy, the power station of few feed consumption, in nuclear power plant, to use various high-voltage switch gears, because nuclear power plant is generally larger, nuclear power generating equipment complex structure, floor space is also larger, therefore in its high voltage switchyard switches set, between CT and the high-pressure side CT of main transformer, conventionally have far distance, what have limits this apart from reaching 1.7km according to place, if adopt traditional cable hardwire mode that the two is connected, can cause T district to protect the secondary cable of each side CT longer, its secondary load is increased, like this, just can affect greatly the characteristic of CT, because the size of CT secondary load impedance has a significant impact the accuracy of instrument transformer, if it is too much that the secondary load impedance of CT increases, once exceed its secondary load impedance limit of allowing, the numerical value of exciting current will increase greatly, and make iron core enter saturation condition, in this case, a big chunk of primary current will be used to provide exciting current, this not only makes the error of instrument transformer greatly increase, its accuracy is also fallen significantly low thereupon, cannot meet nuclear power plant's switchyard for compared with the requirement of high safety factor.
Utility model content
In order to solve the problems of the technologies described above, the utility model provides a kind of can significantly improve the protection system in high voltage switchyard main transformer interval T district for the nuclear power plant of nuclear power plant's high voltage switchyard fail safe.
The utility model for solving the problems of the technologies described above adopted technical scheme is: the protection system in high voltage switchyard main transformer interval T district for a kind of nuclear power plant, comprise the first bus and the second bus, between the first described bus and the second bus, be provided with multiple switches set, each switches set all adopts first circuit breaker of connecting between described the first bus and the second bus, 3/2nds modes of connection of the second circuit breaker and the 3rd circuit breaker are drawn main transformer circuit and transmission line, wherein, described main transformer circuit picks out between described the first circuit breaker and the second circuit breaker, and be connected to outlet isolation switch on this main transformer circuit, described transmission line picks out between described the second circuit breaker and the 3rd circuit breaker, between described the first circuit breaker and the first bus, be connected to a CT, between described the second circuit breaker and the 3rd circuit breaker, be connected to the 2nd CT, at the high-pressure side of described main transformer access the 3rd CT, it is characterized in that: at least have a switches set, in a described CT in this switches set and the secondary circuit of the 2nd CT, access stub protection device, the lead-out wire of drawing from stub protection device also connects, make it access the first short-term optical difference protection device as one group of electric current, at described the 3rd CT place access the second short-term optical difference protection device, between the first described short-term optical difference protection device and the second short-term optical difference protection device, be connected by optical fiber.
In above-mentioned nuclear power plant, with in the protection system in high voltage switchyard main transformer interval T district, its first bus and the second bus are 500KV high-voltage line.
In above-mentioned nuclear power plant, with in the protection system in high voltage switchyard main transformer interval T district, the optical fiber between described the first short-term optical difference protection device of described connection and the second short-term optical difference protection device is two optical-fibre channels.
Use in the protection system in high voltage switchyard main transformer interval T district in above-mentioned nuclear power plant; between described the first circuit breaker and the second circuit breaker, be connected with the second isolation switch and the 3rd isolation switch in turn; between described the second circuit breaker and the 3rd circuit breaker, be connected with the 4th isolation switch and the 5th isolation switch in turn; the 2nd CT is connected between the second circuit breaker and the 4th isolation switch; described main transformer circuit is drawn between the second isolation switch and the 3rd isolation switch, and described transmission line is drawn between described the 4th isolation switch and the 5th isolation switch.
With in the protection system in high voltage switchyard main transformer interval T district, between described the first circuit breaker and the first bus, be connected to the first isolation switch in above-mentioned nuclear power plant, a described CT is connected between described the first circuit breaker and the first isolation switch.
In above-mentioned nuclear power plant, with in the protection system in high voltage switchyard main transformer interval T district, the lead-out wire of drawing from described stub protection device is in the short-term optical difference protection screen cabinet of described stub protection device and connect, and accesses afterwards the first short-term optical difference protection device.
Beneficial effect: a kind of nuclear power plant of the utility model has realized defencive function well by the protection system in high voltage switchyard main transformer interval T district, adopt the main transformer interval short-term equation of light and stub protection mixed configuration scheme and on-the-spot application thoroughly to solve the risk due to switchyard and the distant protection incorrect operation bringing of unit, the secondary current that has solved current transformer and electric current, control and signal circuit is selected difficult problem; Meanwhile, reliability and the fail safe of defencive function of the present utility model are verified, have guaranteed that in high voltage switchyard (particularly 500KV high voltage switchyard) main transformer inlet wire interval and factory, overhead wire can long-term safety stable operation.
Brief description of the drawings
Fig. 1 is the main wiring diagram of nuclear power plant's switchyard;
Fig. 2 is the schematic diagram of the single switch group access protective device in traditional nuclear power plant's switchyard;
Fig. 3 is the structural representation that single group switch of the protection system in high voltage switchyard main transformer interval T district of the utility model nuclear power plant accesses the first embodiment after protection system;
Fig. 4 is the structural representation that single group switch of the protection system in high voltage switchyard main transformer interval T district of the utility model nuclear power plant accesses the second embodiment after protection system.
Embodiment
For making object, technical scheme and the advantage of the utility model embodiment clearer, below in conjunction with the accompanying drawing in the utility model embodiment, technical scheme in the utility model embodiment is clearly described, obviously, described embodiment is the utility model part embodiment, instead of whole embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the utility model protection.
Main transformer refers to total step-down transformer of a unit or transformer station, its capacity is generally larger, other transformer uses as distribution, be commonly referred to as distribution transformer, capacity is slightly little, in nuclear power plant, as shown in Figure 1, the 500KV of nuclear power plant switchyard main wiring diagram, between the bus of two 500KV, be connected to many group switches, in every group of switch, be all connected to three circuit breakers, in the figure, " " represents circuit breaker, " ◇ " represents isolation switch, between two adjacent circuit breakers, draw respectively transmission line and main transformer circuit, form 3/2nds modes of connection, two ends at each circuit breaker are all connected to isolation switch, be convenient to the control to circuit, in every group of switch, all need to access protective device, form secondary current loop by access protective device, and learn the running status of main transformer by the size of current in this secondary current loop.
Figure 2 shows that the schematic diagram of the single group switches set access protective device between traditional nuclear power plant's bus, because distance between switches set and main transformer high-pressure side is too far away, traditional protective device that it adopts, and the secondary current loop access way of cable connection makes the circuit between protective device and main transformer high-pressure side easily produce larger load, when this load is excessive, can affect CT in switchyard switches set and the accuracy of the on high-tension side CT of main transformer, be embodied in, if it is a lot of that the secondary load impedance of CT increases, while having exceeded the secondary load impedance of allowing, the numerical value of exciting current will increase greatly, and make iron core enter saturation condition, in this case, a big chunk of primary current will be used to provide exciting current, thereby the error of instrument transformer is increased greatly, its accuracy has also just decreased.
Need to specialize the abbreviation that the CT in the utility model is current transformer.
As shown in Figure 3, in the first embodiment of the present utility model, be described for one group of switch wherein, be between the first bus 1 and the second bus 2 at two buses, be connected to multiple switches set, every group of switch all adopts 3/2nds modes of connection, be three circuit breakers of connecting in every group of switch, respectively be: the first circuit breaker, the second circuit breaker and the 3rd circuit breaker, between the first circuit breaker and the first bus, be connected to a CT, between the first circuit breaker and the second circuit breaker, be connected successively the second isolation switch and the 3rd isolation switch, between the second circuit breaker and the 3rd circuit breaker, be connected with the 4th isolation switch and the 5th isolation switch in turn, between the second circuit breaker and the 4th isolation switch, be connected to the 2nd CT, in order to realize implementing monitoring and the protection to switches set main transformer T district, at the secondary circuit access stub protection device 3 of a CT and the 2nd CT, and make the lead-out wire of drawing and connect from stub protection device 3, it is accessed in the first short-term optical difference protection device 4 as one group of electric current.
Certainly; protection system for above-mentioned nuclear power plant with high voltage switchyard main transformer interval T district; between two adjacent circuit breakers, draw transmission line and main transformer circuit; main transformer circuit connects main transformer 6; specifically be connected to: between the second isolation switch and the 3rd isolation switch, draw main transformer circuit; and on this main transformer circuit, be connected to outlet isolation switch, between the 4th isolation switch and the 5th isolation switch, draw transmission line.
At the high-pressure side of main transformer access the 3rd CT; at the 3rd CT external lead wire; make it access the second short-term optical difference protection device 5; between the first short-term optical difference protection device 4 and the second short-term optical difference protection device 5, lay two optical-fibre channels; make optical-fibre channel connection thus between the two; to be used for transmission of electric signals, implement the control procedure that coordinates between on high-tension side CT to the CT in switches set and main transformer 6 and switchyard.
For above-mentioned stub protection device 3; and the first short-term optical difference protection device 4, the second short-term optical difference protection device 5, main transformer 6 outlet isolation switch positions are located and connect to the pressing plate dropping in the protection of first, second short-term optical difference protection device and short leg device (not indicating in figure).
In power of the assembling unit operation or main transformer time of falling power transmission,, the function pressing plate of short-term optical difference protection device drops into always, exits stub protection function pressing plate and output clamping, guarantees that short-term optical difference protection reliably drops into; When cyclization operation, manually drop into stub protection function pressing plate and output clamping, exit short-term optical difference protection function pressing plate, guarantee that stub protection reliably drops into.
In the time that main transformer side outlet isolation switch is closed, both sides optical fiber differential protective can drop into automatically by main transformer outlet isolation switch, and stub protection can exit automatically by main transformer outlet isolation switch, also can move back by the hand-operated forced throwing of function pressing plate, in the time that main transformer side outlet isolating switch is opened, both sides optical fiber differential protective can exit automatically by main transformer outlet isolation switch, stub protection can exit automatically by main transformer outlet isolation switch, also can move back by the hand-operated forced throwing of function pressing plate, make system to throw and to move back with main transformer side outlet isolation switch change in location, well realize defencive function, nuclear power plant's main transformer interval short-term equation of light and stub protection allocation plan and on-the-spot application, thoroughly solve the risk due to switchyard and the distant protection incorrect operation bringing of unit, CT and electric current are solved, the secondary current of control and signal circuit is selected difficult problem.
What need to explicitly point out is, stub protection device 3 in the utility model, and the first short-term optical difference protection device 4, the connected mode of the second short-term optical difference protection device 5 in switchyard, and first the switchyard protection system that forms of connected mode between short-term optical difference protection device 4 and the second short-term optical difference protection device 5 be all suitable for for switches set all in switchyard, applicable equally for other switches set for the system protection pattern of the single group switches set in switchyard above, due to the not difference in essence of connection principle and the mode of connection, therefore the no longer elaboration of one group of group, those skilled in the art can learn the mode of connection and the operation of other switches set from the wiring of above-mentioned this list group is described, therefore save the elaboration of the connection plan to other switches set in switchyard.
As the second embodiment of the present utility model, still be described for one group of switch wherein, this kind of situation is all connected to the situation of main transformer for the switches set two ends in switchyard, as shown in Figure 4, between the first bus and the second bus, be connected to multiple switches set, every group of switch all adopts 3/2nds modes of connection, be three circuit breakers of connecting in every group of switch, respectively be: the first circuit breaker, the second circuit breaker and the 3rd circuit breaker, what now between two adjacent circuit breakers, draw is all main transformer circuits, specifically be connected to: between the first circuit breaker and the second circuit breaker, draw the first main transformer circuit, between the second circuit breaker and the 3rd circuit breaker, draw the second main transformer circuit, between the first circuit breaker and the second circuit breaker, be connected to the 5th CT, between the 3rd circuit breaker and the second bus, be all connected to the 4th CT, for implementing monitoring and the protection scheme in switches set the second main transformer T district be now, between the 4th CT and the secondary circuit of the 5th CT, access stub protection device 3, and make the lead-out wire of drawing and connect from stub protection device 3, make it access the first short-term optical difference protection device 4 as one group of electric current, at the high-pressure side of the second main transformer 7 access the 6th CT, at the 6th CT external lead wire, make it access the second short-term optical difference protection device 5, between the first short-term optical difference protection device 4 and the second short-term optical difference protection device 5, lay two optical-fibre channels, make optical-fibre channel connection thus between the two, to be used for transmission of electric signals, implement the control procedure that coordinates between on high-tension side the 6th CT to the CT in switches set and main the second change 7 and switchyard.
For above-mentioned stub protection device 3, and the first short-term optical difference protection device 4, the second short-term optical difference protection device 5, the pressing plate place dropping in the protection of first, second short-term optical difference protection device and short leg device also connects main transformer outlet isolation switch position.
The operation principles of the second embodiment is identical with embodiment mono-, and power of the assembling unit operation or main transformer time of falling power transmission, the function pressing plate of short-term optical difference protection device drops into always, exits stub protection function pressing plate and output clamping, guarantees that short-term optical difference protection reliably drops into; When cyclization operation, manually drop into stub protection function pressing plate and output clamping, exit short-term optical difference protection function pressing plate, guarantee that stub protection reliably drops into.
In the time that main transformer side outlet isolation switch is closed, both sides optical fiber differential protective can drop into automatically by main transformer outlet isolation switch, and stub protection can exit automatically by main transformer outlet isolation switch, also can move back by the hand-operated forced throwing of function pressing plate, in the time that main transformer side outlet isolating switch is opened, both sides optical fiber differential protective can exit automatically by main transformer outlet isolation switch, stub protection can exit automatically by main transformer outlet isolation switch, also can move back by the hand-operated forced throwing of function pressing plate, make system to throw and to move back with main transformer side outlet isolation switch change in location, well realize defencive function, nuclear power plant's main transformer interval short-term equation of light and stub protection allocation plan and on-the-spot application, thoroughly solve the risk due to switchyard and the distant protection incorrect operation bringing of unit, CT and electric current are solved, the secondary current of control and signal circuit is selected difficult problem.
Same; stub protection device 3 in the second embodiment; and the first short-term optical difference protection device 4, the connected mode of the second short-term optical difference protection device 5 in switchyard; and first the switchyard protection system that forms of connected mode between short-term optical difference protection device 4 and the second short-term optical difference protection device 5 be all suitable for for switches set all in switchyard, the above system protection pattern for the single group switches set in switchyard is applicable equally for other switches set.
Claims (6)
1. the protection system in a use high voltage switchyard main transformer interval T district of nuclear power plant, comprise the first bus (1) and the second bus (2), between described the first bus (1) and the second bus (2), be provided with multiple switches set, each described switches set all adopts first circuit breaker of connecting between described the first bus (1) and the second bus (2), 3/2nds modes of connection of the second circuit breaker and the 3rd circuit breaker are drawn main transformer circuit and transmission line, wherein, described main transformer circuit picks out between described the first circuit breaker and the second circuit breaker, and be connected to outlet isolation switch on this main transformer circuit, described transmission line picks out between described the second circuit breaker and the 3rd circuit breaker, between described the first circuit breaker and the first bus, be connected to a CT, between described the second circuit breaker and the 3rd circuit breaker, be connected to the 2nd CT, at the high-pressure side of described main transformer access the 3rd CT, it is characterized in that: at least have a switches set, between a described CT in this switches set and the secondary circuit of the 2nd CT, access stub protection device (3), the lead-out wire of drawing from described stub protection device (3) also connects, make it access the first short-term optical difference protection device (4) as one group of electric current, at described the 3rd CT place access the second short-term optical difference protection device (5), between the first described short-term optical difference protection device (4) and the second short-term optical difference protection device (5), be connected by optical fiber.
2. the protection system in high voltage switchyard main transformer interval T district for nuclear power plant as claimed in claim 1, is characterized in that: described the first bus (1) and the second bus (2) are 500KV high-voltage line.
3. the protection system in high voltage switchyard main transformer interval T district for nuclear power plant as claimed in claim 2, is characterized in that: the optical fiber between described the first short-term optical difference protection device (4) of described connection and the second short-term optical difference protection device (5) is two optical-fibre channels.
4. the protection system in high voltage switchyard main transformer interval T district for nuclear power plant as claimed in claim 3, it is characterized in that: between described the first circuit breaker and the second circuit breaker, be connected with the second isolation switch and the 3rd isolation switch in turn, between described the second circuit breaker and the 3rd circuit breaker, be connected with the 4th isolation switch and the 5th isolation switch in turn, the 2nd CT is connected between the second circuit breaker and the 4th isolation switch, described main transformer circuit is drawn between the second isolation switch and the 3rd isolation switch, described transmission line is drawn between described the 4th isolation switch and the 5th isolation switch.
5. the protection system in high voltage switchyard main transformer interval T district for nuclear power plant as claimed in claim 4; it is characterized in that: between described the first circuit breaker and the first bus, be connected to the first isolation switch, a described CT is connected between described the first circuit breaker and the first isolation switch.
6. the protection system in high voltage switchyard main transformer interval T district for nuclear power plant as claimed in claim 1; it is characterized in that: the lead-out wire of drawing from described stub protection device (3) is in the short-term optical difference protection screen cabinet of described stub protection device and connect, access afterwards the first short-term optical difference protection device (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420291978.3U CN203871849U (en) | 2014-06-03 | 2014-06-03 | Protection system for spacing T area of main transformer at high-voltage switching station of nuclear power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420291978.3U CN203871849U (en) | 2014-06-03 | 2014-06-03 | Protection system for spacing T area of main transformer at high-voltage switching station of nuclear power plant |
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| Publication Number | Publication Date |
|---|---|
| CN203871849U true CN203871849U (en) | 2014-10-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420291978.3U Expired - Lifetime CN203871849U (en) | 2014-06-03 | 2014-06-03 | Protection system for spacing T area of main transformer at high-voltage switching station of nuclear power plant |
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| CN (1) | CN203871849U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111641194A (en) * | 2020-05-21 | 2020-09-08 | 南京国电南自电网自动化有限公司 | Circuit breaker protection device and method integrating short lead protection |
-
2014
- 2014-06-03 CN CN201420291978.3U patent/CN203871849U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111641194A (en) * | 2020-05-21 | 2020-09-08 | 南京国电南自电网自动化有限公司 | Circuit breaker protection device and method integrating short lead protection |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20141008 |