CN108695968B - Bus PT parallel system - Google Patents
Bus PT parallel system Download PDFInfo
- Publication number
- CN108695968B CN108695968B CN201810629388.XA CN201810629388A CN108695968B CN 108695968 B CN108695968 B CN 108695968B CN 201810629388 A CN201810629388 A CN 201810629388A CN 108695968 B CN108695968 B CN 108695968B
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- parallel
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- loop
- breaker
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- 238000002955 isolation Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/02—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which an auxiliary distribution system and its associated lamps are brought into service
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
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- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Gas-Insulated Switchgears (AREA)
Abstract
The invention relates to a bus PT parallel system, which comprises a primary main circuit and a secondary control circuit, wherein the primary main circuit comprises at least four buses of two same power supplies, each bus is connected with a PT device, the two buses of the same power supply and different power supplies are respectively parallel through corresponding primary parallel loops, and a circuit breaker and/or a disconnecting switch are arranged in the primary parallel loops in series; the secondary control circuit comprises a PT parallel control loop and a PT disconnection control loop corresponding to each primary parallel loop, a normally open contact switch of a breaker and/or a disconnecting switch which are/is connected in series in each primary parallel loop is connected in series in the corresponding PT parallel control loop, and a normally closed contact switch of the breaker and/or the disconnecting switch which are/is connected in series in each primary parallel loop is connected in parallel in the corresponding PT disconnection control loop. According to the invention, each section of bus is parallel to at least two other buses through the primary parallel loop, so that the condition that the two sections of buses PT exit from the bus at the same time without protection voltage is avoided, and the protection reliability is enhanced.
Description
Technical Field
The invention relates to a bus PT parallel system, and belongs to the technical field of high-voltage power distribution systems.
Background
The PT parallel mode has wide application range, is suitable for substations with voltage levels of 110KV and below of a power system, is also suitable for switching stations in power plants and hydropower stations, and is also suitable for substations with people on duty, with few people on duty or without people on duty; the method is suitable for a comprehensive automatic system of a newly-built transformer substation and is also suitable for automatic transformation of a conventional transformer substation (old transformer substation); the transformer substation automation system can be formed in a centralized screen assembly mode, and can be formed in a fully-dispersed or both local dispersion mode; the transformer substation automation system with relatively independent configuration of protection and monitoring can be built, and the transformer substation automation system with integrated configuration of protection and monitoring can also be built. The method is also suitable for the fields of highway, electric railway, subway, mine, petrochemical industry, metallurgy, port, water supply, environmental protection, machine room and other industrial automation.
PT juxtaposition: strong electricity specialty, the term power system. PT is voltage transformer, and bus PT is used for measuring bus three-phase voltage, and two sections buses, one PT of each section bus, when I bus PT is retried, need withdraw from the operation, and I bus's protection continues to operate (taking into account the function of locking of taking the low pressure) this moment, and protection loss voltage can take place the maloperation, and the protection voltage on two sections buses need to be kept with II bus PT this moment, consequently, need PT juxtaposing. When parallel, the bus-tie/sectionalizing switch is closed at first and once, and then the PT parallel handle is arranged at the parallel position. The two side knife switches and the switch contacts of the bus-tie/sectionalizer are required to be connected in series to the secondary PT parallel loop, so that the secondary PT parallel can be ensured only under the condition of primary parallel. However, when the two bus lines PT are simultaneously withdrawn from operation, a protection malfunction may be caused due to the fact that there is no protection voltage on the bus lines.
Disclosure of Invention
The invention aims to provide a bus PT parallel system which is used for solving the problem that protection misoperation is caused when two sections of buses PT simultaneously exit to run.
In order to solve the technical problems, the invention provides a bus PT parallel system, which comprises a primary main circuit and a secondary control circuit, wherein the primary main circuit comprises at least four buses with two same power supplies, each bus is connected with a PT device, two buses with the same power supply and two buses with different power supplies are respectively parallel through corresponding primary parallel loops, and a circuit breaker and/or a disconnecting switch are/is arranged in the primary parallel loops in series; the secondary control circuit comprises a PT parallel control loop and a PT disconnection control loop corresponding to each primary parallel loop, a normally open contact switch of a breaker and/or a disconnecting switch which are/is connected in series in each primary parallel loop is arranged in the corresponding PT parallel control loop, and a normally closed contact switch of the breaker and/or the disconnecting switch which are/is connected in series in each primary parallel loop is connected in parallel in the corresponding PT disconnection control loop.
Further, the primary main circuit comprises four buses of two-to-two power supplies.
Further, two circuit breakers are connected in series in a primary parallel loop corresponding to two buses of the power supply.
Further, a circuit breaker and a disconnecting switch are arranged in series in a primary parallel loop corresponding to two buses of different power supplies.
The beneficial effects of the invention are as follows: each section of bus can be parallel with other at least two buses through a primary parallel loop, when any section of bus PT exits from running, other two sections of buses can be selected to be parallel with the other section of bus PT, the condition that no protection voltage exists on the buses when the two sections of buses PT exit from running at the same time is avoided, and the reliability of protection is enhanced.
Drawings
FIG. 1 is a schematic diagram of a primary main loop of a bus PT parallel system;
fig. 2 is a process diagram when the bus bars PT are juxtaposed;
FIG. 3 is a schematic diagram showing secondary control of parallel conditions of the I-2 master (I-1 master) and the II-1 master (II-2 master) PT;
FIG. 4 is a schematic diagram showing secondary control of the I-2 parent (I-1 parent) and II-1 parent (II-2 parent) PT splitting conditions;
FIG. 5 is a schematic diagram showing secondary control of parallel conditions of the I-1 master (II-1 master) and the I-2 master (II-2 master) PT;
FIG. 6 is a schematic diagram showing secondary control of the I-1 master (II-1 master) and I-2 master (II-2 master) PT splitting conditions.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
The invention provides a bus PT parallel system, which comprises a primary main circuit and a secondary control circuit, wherein the primary main circuit comprises at least four buses with two same power supplies, and each bus is connected with a PT device. Wherein, two buses of the same power supply and two buses of different power supplies are respectively parallel through corresponding primary parallel loops, and a circuit breaker and/or a disconnecting switch are arranged in the primary parallel loops in series. The secondary control circuit comprises a PT parallel control loop and a PT disconnection control loop corresponding to each primary parallel loop, a normally open contact switch of a breaker and/or a disconnecting switch which are/is connected in series in each primary parallel loop is arranged in the corresponding PT parallel control loop, and a normally closed contact switch of the breaker and/or the disconnecting switch which are/is connected in series in each primary parallel loop is connected in parallel in the corresponding PT disconnection control loop.
The primary main circuit and the secondary control circuit in the bus PT parallel system will be described below by taking four buses in which the primary main circuit includes two-by-two identical power supplies as an example.
As shown in FIG. 1, the primary main circuit comprises an I-1 bus, an I-2 bus, an II-1 bus and an II-2 bus, wherein the I-1 bus and the I-2 bus are connected with a 1# transformer, the II-1 bus and the II-2 bus are connected with a 2# transformer, and the I-1 bus, the I-2 bus, the II-1 bus and the II-2 bus are respectively connected with a PT device 1TV, a PT device 2TV, a PT device 3TV and a PT device 4TV.
A circuit breaker is arranged between the 1# transformer and the I-1 bus in series, and comprises a circuit breaker switch 11QF and a handcart working position point 11G; a circuit breaker is arranged between the 1# transformer and the I-2 bus in series, and comprises a circuit breaker switch 12QF and a handcart working position point 12G; a circuit breaker is arranged between the 2# transformer bus and the II-1 bus in series, and comprises a circuit breaker switch 21QF and a handcart working position point 21G; a circuit breaker is provided in series between the # 2 and the ii-2 bus bars, the circuit breaker including a circuit breaker switch 22QF and a cart operating position point 22G. At this time, the I-1 bus and the I-2 bus which are the same as the power supply are juxtaposed by a primary parallel loop consisting of 11QF, 11G, 12QF and 12G; the two buses II-1 and II-2 of the same power supply are juxtaposed by a primary parallel loop consisting of 21QF, 21G, 22QF and 22G. The I-2 bus and the II-1 bus of different power supplies are parallel through a primary parallel loop formed by a breaker and a disconnecting switch, wherein the breaker comprises a breaker switch 3QF and a handcart working position point 3G, and the disconnecting switch is actually the handcart working position point 1G; the I-1 bus and the II-2 bus of different power supplies are parallel through a primary parallel loop formed by a breaker and a disconnecting switch, wherein the breaker comprises a breaker switch 4QF and a handcart working position point 4G, and the disconnecting switch is actually the handcart working position point 2G.
The secondary control circuit in the bus PT parallel system comprises a PT parallel control loop and a PT disconnection control loop. As shown in fig. 3, normally open contact switches of a breaker and a disconnecting switch are arranged in parallel in PT parallel control loops corresponding to an I-2 bus and an II-1 bus of different power supplies in series, namely a normally open contact switch corresponding to a breaker switch 3QF, a normally open contact switch corresponding to a handcart working position point 3G and a normally open contact switch corresponding to a disconnecting switch 1G. Normally open contact switches of a breaker and a disconnecting switch are arranged in parallel in PT parallel control loops corresponding to an I-1 bus and an II-2 bus of different power supplies, namely a normally open contact switch corresponding to a breaker switch 4QF and a normally open contact switch corresponding to a handcart working position point 4G, and a normally open contact switch corresponding to a disconnecting switch 2G.
In the parallel process of PT, the I-2 mother and the II-1 mother and the I-1 mother and the II-2 mother are combined with an isolation/sectionalizer (the isolation/sectionalizer refers to an isolation handcart/sectionalizer circuit breaker) at first and once, and then the PT parallel handles are arranged at the parallel positions. The 1G/2G working position point of the isolating switch handcart of the isolating cabinet, the 3QF/4QF closing position point of the breaker of the sectional cabinet and the 3G/4G position point of the handcart of the sectional cabinet are required to be connected in series to the secondary PT parallel loop. As shown in fig. 2, it is ensured that the secondary juxtaposition is possible only in the case of the primary juxtaposition.
As shown in fig. 4, normally closed contact switches of a breaker and a disconnecting switch are arranged in parallel in PT disconnection control loops corresponding to the I-2 bus and the II-1 bus, namely, a normally closed contact switch corresponding to the breaker switch 3QF, a normally closed contact switch corresponding to the handcart working position point 3G and a normally closed contact switch corresponding to the disconnecting switch 1G. And normally closed contact switches of a breaker and an isolating switch are arranged in parallel in PT disconnection control loops corresponding to the I-1 bus and the II-2 bus, namely the normally closed contact switch corresponding to the breaker switch 4QF and the normally closed contact switch corresponding to the handcart working position point 4G, and the normally closed contact switch corresponding to the isolating switch 2G. During operation, the PT can automatically cancel the juxtaposition as long as one of the isolation/sectionalizers (isolation knife/breaker) is in an open state.
As shown in fig. 5, a normally open contact switch corresponding to a breaker switch 11QF, a normally open contact switch corresponding to a handcart operating position point 11G, a normally open contact switch corresponding to a breaker switch 12QF, and a normally open contact switch corresponding to a handcart operating position point 12G are arranged in parallel in a PT parallel control loop corresponding to an i-1 bus and an i-2 bus of the power supply. The PT parallel control loop corresponding to the II-1 bus and the II-2 bus of the power supply is provided with a normally open contact switch corresponding to the breaker switch 21QF, a normally open contact switch corresponding to the handcart working position point 21G, a normally open contact switch corresponding to the breaker switch 22QF and a normally open contact switch corresponding to the handcart working position point 22G in series.
In the parallel process of PT, the I-1 bus and the I-2 bus, the II-1 bus and the II-2 bus are combined once, 2 main transformer incoming line switches below one transformer are combined, and then the PT parallel handles are arranged at parallel positions. The switch-on position point of the breaker 11QF/21QF of the main transformer incoming cabinet 1, the working position point of the handcart 11G/21G of the main transformer incoming cabinet 1, the switch-on position point of the breaker 12QF/22QF of the main transformer incoming cabinet 2 and the working position point of the handcart 12G/22G of the main transformer incoming cabinet 2 are required to be connected in series to the secondary PT parallel loop. As shown in fig. 2, it is ensured that the secondary juxtaposition is possible only in the case of the primary juxtaposition.
As shown in fig. 6, a normally closed contact switch corresponding to a breaker switch 11QF, a normally closed contact switch corresponding to a handcart operating position point 11G, a normally closed contact switch corresponding to a breaker switch 12QF, and a normally closed contact switch corresponding to a handcart operating position point 12G are arranged in parallel in a PT disconnection control loop corresponding to an i-1 bus and an i-2 bus of the power supply. The PT disconnection control loop corresponding to the II-1 bus and the II-2 bus of the power supply is provided with a normally closed contact switch corresponding to the breaker switch 21QF, a normally closed contact switch corresponding to the handcart working position point 21G, a normally closed contact switch corresponding to the breaker switch 22QF and a normally closed contact switch corresponding to the handcart working position point 22G in parallel. During operation, the PT can automatically cancel the juxtaposition as long as one of the isolation/sectionalizers (isolation knife/breaker) is in an open state.
When the types and the numbers of the switches which are serially connected in the primary parallel circuits corresponding to the two buses of the same power supply and the two buses of different power supplies are changed, normally open contact switches corresponding to the switches are serially connected in the corresponding PT parallel control circuits, and normally closed contact switches corresponding to the switches are parallelly connected in the corresponding PT separation control circuits.
Under normal conditions, four sections of buses in the bus PT parallel system can independently operate, wherein when any section of bus PT exits from operation, two adjacent sections of buses can be selected to be parallel with the bus PT. For example, when the I-1 bus needs to be taken out of operation, the I-2 bus PT or the II-2 bus PT can be selected to maintain the protection voltage on the two-section bus; when the I-2 bus needs to be withdrawn for operation, the I-1 bus PT or the II-1 bus PT can be selected to maintain the protection voltage on the two sections of buses; when the II-1 bus needs to be withdrawn for operation, selecting the I-2 bus PT or the II-2 bus PT to maintain the protection voltage on the two sections of buses; when the II-2 bus needs to be withdrawn for operation, the I-1 bus PT or the II-1 bus PT can be selected to maintain the protection voltage on the two-section bus.
Compared with the parallel mode of two sections of buses PT, the parallel system of buses PT adopts a loop parallel control mode, and can avoid the condition that no protection voltage exists on the buses when the two sections of buses PT simultaneously withdraw from operation. For example, when the I-1 master PT and the I-2 master PT are simultaneously withdrawn, the I-1 master PT can select the II-2 master PT to maintain the protection voltage on the two-section buses, and the I-2 master PT can select the II-1 master PT to maintain the protection voltage on the two-section buses; when the I-2 bus PT and the II-1 bus PT simultaneously exit, the I-2 bus PT can select the I-1 bus PT to maintain the protection voltage on the two sections of buses, and the II-1 bus PT can select the II-2 bus PT to maintain the protection voltage on the two sections of buses.
Claims (3)
1. The bus PT parallel system is characterized by comprising a primary main circuit and a secondary control circuit, wherein the primary main circuit comprises four buses of two same power supplies, each bus is connected with a PT device, an I-1 bus and an I-2 bus of the same power supply are parallel through corresponding primary parallel circuits, an II-1 bus and an II-2 bus of the same power supply are parallel through corresponding primary parallel circuits, an I-2 bus and an II-1 bus of different power supplies are parallel through corresponding primary parallel circuits, an I-1 bus and an II-2 bus of different power supplies are parallel through corresponding primary parallel circuits, and a circuit breaker and/or an isolating switch are arranged in series in the primary parallel circuits; the secondary control circuit comprises a PT parallel control loop and a PT disconnection control loop corresponding to each primary parallel loop, a normally open contact switch of a breaker and/or a disconnecting switch which are/is connected in series in each primary parallel loop is arranged in the corresponding PT parallel control loop, and a normally closed contact switch of the breaker and/or the disconnecting switch which are/is connected in series in each primary parallel loop is connected in parallel in the corresponding PT disconnection control loop.
2. The parallel system of bus bars PT according to claim 1, wherein two circuit breakers are provided in series in a primary parallel circuit corresponding to two bus bars of the power supply.
3. The bus PT parallel system of claim 1, wherein a circuit breaker and a disconnector are connected in series in a primary parallel circuit corresponding to two buses of different power sources.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810629388.XA CN108695968B (en) | 2018-06-19 | 2018-06-19 | Bus PT parallel system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810629388.XA CN108695968B (en) | 2018-06-19 | 2018-06-19 | Bus PT parallel system |
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| Publication Number | Publication Date |
|---|---|
| CN108695968A CN108695968A (en) | 2018-10-23 |
| CN108695968B true CN108695968B (en) | 2024-02-20 |
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| CN201810629388.XA Active CN108695968B (en) | 2018-06-19 | 2018-06-19 | Bus PT parallel system |
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| CN111917105B (en) * | 2020-07-07 | 2022-09-06 | 广东电网有限责任公司 | Circuit for preventing misoperation of bus voltage parallel circuit based on microcomputer five-prevention |
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|---|---|
| CN108695968A (en) | 2018-10-23 |
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