CN220234196U - Three-phase power supply system capable of rapidly processing interphase short-circuit fault - Google Patents
Three-phase power supply system capable of rapidly processing interphase short-circuit fault Download PDFInfo
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- CN220234196U CN220234196U CN202321783921.0U CN202321783921U CN220234196U CN 220234196 U CN220234196 U CN 220234196U CN 202321783921 U CN202321783921 U CN 202321783921U CN 220234196 U CN220234196 U CN 220234196U
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Abstract
The utility model discloses a three-phase power supply system for rapidly processing interphase short-circuit faults, which comprises a power supply and a bus, wherein at least one outgoing line is arranged on the bus, a three-phase linkage circuit breaker is arranged on the outgoing line, a plurality of controlled switches are arranged below the three-phase linkage circuit breaker, and the controlled switches can detect current information and cut off a line according to the current information; a fault processing switch and a current limiting resistor are arranged between the lower opening of the three-phase linkage circuit breaker and the bus, the fault processing switch can connect two phases or three phases of the lower opening of the three-phase linkage circuit breaker with the bus and connect the two phases or the three phases with the bus in series into the current limiting resistor, and the fault processing switch can detect current information and cut off a circuit according to the current information. The system can accurately and rapidly locate and cut off faults without installing a switch for short-circuiting the three-phase linkage circuit breaker, is simple in construction when the existing power supply system is transformed, and can effectively reduce labor and equipment cost.
Description
Technical Field
The utility model relates to the field of power supply system fault processing, in particular to a three-phase power supply system capable of rapidly processing interphase short circuit.
Background
The traditional three-phase power supply system processes interphase short circuit as follows: 1. the reclosing mode is adopted: the first breaker on the line is first disconnected and then the first breaker is closed again, and if there is a momentary phase-to-phase short circuit, and the first breaker is removed before closing, normal power supply continues. If the phase-to-phase short fault still exists after the first breaker is closed, the first breaker is disconnected and the maintenance is waited. 2. The method adopts a time level difference matching method: the method can isolate a fault area, but for faults with fault points close to the power supply, the power supply system has long short-circuit current tolerance time and large impact on a power grid. 3. And if the interphase short circuit occurs between the penultimate breaker and the last breaker, the faults can be removed, and the like, the breakers are sequentially cut off upwards until the faults are removed. However, during this operation, the circuit breaker, which is not cut off, is continuously subjected to a large short-circuit current surge, and if it is too long, damage to the line is caused. If the duration of the inter-phase short circuit cannot exceed 300 ms and the tripping time of the circuit breaker is 100ms, three circuit breakers are not suitable for the common line, otherwise, the method may cause the line to impact more than 300 ms.
In order to solve the above problems, the utility model patent CN215580360U discloses a three-phase power supply system which is convenient for processing interphase short circuit, can rapidly locate interphase short circuit fault point intervals and can accurately cut off faults. The three-phase power supply system comprises a power supply and a bus, wherein an outgoing line is arranged on the bus, a circuit breaker and a controlled switch are arranged on the outgoing line, the controlled switch can cut off a line according to current information, a second switch is arranged between the lower opening of the circuit breaker and the bus, any phase can be connected with the bus at the lower opening of the circuit breaker, the power supply system requires the circuit breaker to be a single-phase independently controlled circuit breaker or a three-phase linkage circuit breaker, but if the circuit breaker is a three-phase linkage circuit breaker, the fault treatment can be smoothly realized only by additionally arranging a first switch which can short-circuit the single phase of the three-phase linkage circuit breaker. In practice, in the existing power supply system, the circuit breakers are generally three-phase linkage circuit breakers, and if the existing power supply system is modified by using the technology of the utility model, the switch capable of shorting the three-phase linkage circuit breakers in a single phase needs to be additionally arranged, which results in complicated construction and higher labor and equipment cost.
Disclosure of Invention
The utility model aims to provide a three-phase power supply system for rapidly processing interphase short circuit, which can accurately and rapidly position and remove faults without installing a switch for short-circuiting the three-phase linkage circuit breaker, has simple construction when the existing power supply system is transformed, and can effectively reduce labor and equipment cost.
In order to achieve the above purpose, the present utility model adopts the following technical scheme:
the three-phase power supply system for rapidly processing interphase short-circuit faults comprises a power supply and a bus, wherein at least one outgoing line is arranged on the bus, a three-phase linkage circuit breaker is arranged on the outgoing line, a plurality of controlled switches are arranged below the three-phase linkage circuit breaker, and the controlled switches can detect current information and cut off a line according to the current information; a fault processing switch and a current limiting resistor are arranged between the lower opening of the three-phase linkage circuit breaker and the bus, the fault processing switch can connect two phases or three phases of the lower opening of the three-phase linkage circuit breaker with the bus and connect the two phases or the three phases with the bus in series into the current limiting resistor, and the fault processing switch can detect current information and cut off a line according to the current information.
Preferably, the fault handling switch comprises three single-phase switches positioned in ABC three phases, and each single-phase switch is connected in series with a current limiting resistor. Or preferably, the fault handling switch comprises three single-phase switches positioned in ABC three phases, wherein two single-phase switches are connected in series with one current limiting resistor, and the other single-phase switches are not connected in series with the current limiting resistor. Or preferably, the fault handling switch is a three-phase linkage switch, and two or three phases are connected in series with the current limiting resistor.
Preferably, the current information is a current duration, the current duration of the controlled switch trigger cut-off at the downstream of the power supply direction is shorter than the current duration of the controlled switch trigger cut-off at the upstream of the power supply direction, and the current duration of the single-phase switch trigger cut-off is longer than the current duration of the controlled switch trigger cut-off.
Preferably, the current information is the number of current pulses, the single-phase switch can be used for circularly connecting and disconnecting a certain phase of the lower opening of the three-phase linkage breaker with a bus, the number of current pulses triggered and cut off by the controlled switch at the downstream of the power supply direction is smaller than the number of current pulses triggered and cut off by the controlled switch at the upstream of the power supply direction, and the number of current pulses triggered and cut off by the single-phase switch is larger than the number of current pulses triggered and cut off by the controlled switch. In this embodiment, the single-phase switch is preferably an electronic power switch, such as an insulated gate bipolar transistor.
The utility model has the beneficial effects that: when the interphase short-circuit fault is processed, the three-phase linkage breaker is firstly disconnected, then two phases (three phases can be also used instead of only one phase) are conducted at the lower ports of the bus and the three-phase linkage breaker by utilizing the fault processing switch, so that a conducting detection loop comprising interphase short-circuit points can be constructed, and fault processing is realized. The patent CN215580360U is directed to a three-phase linkage circuit breaker, in which when an inter-phase short circuit is handled, a phase of the lower port of the circuit breaker and a bus is conducted, and at this time, a conducting detection loop cannot be constructed yet, so that it is also necessary to short one phase of the disconnected three-phase linkage circuit breaker by means of an additional first switch to construct a conducting detection loop, thereby realizing fault handling. Therefore, compared with the utility model CN215580360U, the utility model simultaneously realizes the effects of connecting the lower port of the three-phase linkage breaker with one phase of the bus and shorting the three-phase linkage breaker with one phase by using the fault processing switch, namely, the functions of the first switch and the second switch in the utility model CN215580360U are completely integrated into the fault processing switch, so that the switch setting can be reduced, and the construction and equipment cost is reduced.
Drawings
Fig. 1 is a schematic diagram of a power supply system according to the present utility model, in which a fault is handled when an inter-phase short circuit occurs.
Detailed Description
The utility model is further illustrated by the following examples, taken in conjunction with the accompanying drawings:
the three-phase power supply system comprises a power supply and a bus connected with the power supply, wherein a plurality of outgoing lines are arranged on the bus, a plurality of controlled switches are arranged on each outgoing line, the controlled switches can be a switch which can cut off a three-phase line when the number of current pulses passing through any one phase reaches a preset value according to the current pulses on one phase, two phases or three phases on a set detection line, and the corresponding controlled switches can be tripped according to the difference of the current durations. In a specific embodiment related to the controlled switch, the controlled switch includes a control unit, a current detection unit and an execution unit, where the current detection unit can detect the pulse number or the duration of each phase of current of the three-phase line, the control unit compares the current pulse number or the current duration detected by the current detection unit with a preset value, and can set a signal to make the execution unit cut off the three-phase line when the current pulse number of any phase reaches the preset value. For a preset value of the number of current pulses triggering the switching off, the preset value of the number of current pulses of the controlled switch downstream in the power supply direction (in the direction indicated by the arrow in fig. 1) is smaller than the preset value upstream in the power supply direction, or the preset value of the set current duration of the controlled switch downstream in the power supply direction is smaller than the preset value of the current duration upstream in the power supply direction. The upstream side of the power supply, i.e. relatively closer to the power supply, and the downstream side of the power supply, i.e. relatively further away from the power supply, i.e. electrical energy is emitted from the power supply and transmitted from the upstream side to the downstream side. Or, as seen from the upstream and downstream of the power supply direction, the smaller the preset value of the pulse number or the shorter the preset value of the current duration of the controlled switch trigger switch which is farther from the power supply, the easier the trigger condition is reached so as to switch off. In practice, the circuit breakers arranged on each outgoing line can detect the number of current pulses or the current duration flowing through the circuit breakers, and can cut off the line when a certain phase or phases pass through a certain current pulse number or current duration, so the circuit breakers can be regarded as controlled switches.
In one embodiment of the three-phase power supply system, as shown in fig. 1, a first breaker 90 is disposed on each outgoing line of ABC three phases near the bus, and the first breaker 90 is a three-phase linkage breaker, i.e. the three phases are cut off or closed at the same time, and one or two phases cannot be selected for operation. A plurality of circuit breakers (which can be regarded as controlled switches after setting trigger conditions according to the number of current pulses or the current duration after the occurrence of the interphase short circuit) are arranged below the first circuit breaker 90, and each circuit breaker can cut off a three-phase line according to the current duration of a certain phase. The lower port of the first breaker 90 is provided with a fault handling switch 2, three switches KA2, KB2 and KC2 in the fault handling switch 2 are three single-phase switches, and any two or three of the three phases in the outgoing line can be connected with the bus. The interphase short-circuit current is generally large, and in order to avoid the overcurrent protection of the trigger line, a current limiting resistor 3 is connected in series with the fault handling switch 2. The current limiting resistor can be connected in series in two phases (at least one phase of current limiting resistor can enter a built detection loop to perform current limiting), or three phases of current limiting resistors can be connected in series. If a simple interphase short circuit (such as a BC two-phase short circuit or a three-phase short circuit) occurs at the point F, the first breaker 90 is first tripped to cut off the three-phase line, then the fault phases B and C are conducted between the lower opening of the first breaker 90 and the bus through the closing of the switches KB2 and KC2 in the fault handling switch 2, so that a detection loop is constructed between the fault phases B and C and the power supply and a detection current is generated, the detection current is far smaller than the original short circuit current due to the existence of the current limiting resistor, no impact is caused to the system, no current flows through the controlled switch 93, no current flows through the controlled switch 91, no current flows through the controlled switch 92 and the like, and the time duration of the current triggered to be cut off by the controlled switch 91 is shorter than that of the controlled switch 92, so that the controlled switch 91 is cut off first, and the fault is reasonably removed. The detected current disappears due to the fault point removal, and the controlled switch 92 does not operate until the current duration for triggering the cut-off is reached. The fault handling switch 2 is also configured to be turned off according to a current duration, and the current duration is longer than a current duration for triggering and turning off of each controlled switch, if an interphase short-circuit fault occurs between two controlled switches, the single-phase switch in the fault handling switch 2 can detect that the current disappears when the current duration for triggering and turning off is not reached, at this time, the switches KB2 and KC2 are turned off, the first breaker 90 is turned on, and line power transmission is restored. If a phase-to-phase short fault occurs between the fault handling switch 2 and the first controlled switch 92 downstream thereof, the fault handling switch 2 is operated to disconnect the line when the detected current period reaches the current period for which the triggering of the fault handling switch 2 is disconnected, and the first circuit breaker 90 is not closed.
In another embodiment, the number of current pulses is used to trigger the shut-off. When the switches KB2, KC2 are closed in the above-described manner, one of the switches KB2, KC2 is turned off and on cyclically, and thus current pulses are repeatedly generated, which flow through the failed phase B and the failed phase C, and when the number of current pulses reaches the trigger condition of the nearest controlled switch 91 above the inter-phase short-circuit point F, the controlled switch 91 cuts off the line, thereby excluding the system from the inter-phase short-circuit point F (at this time, the trigger condition of the controlled switch 92 further upstream has not been reached, so the controlled switch 92 is not cut off, and the controlled switch 93 below the inter-phase short-circuit point on the B phase does not operate because no current pulse flows). The switches KB2, KC2 are then opened and the first breaker 90 is closed to restore line power. In this embodiment, the switches KB2, KC2 may be electronic power switches, such as insulated gate bipolar transistors, which are very convenient to turn on and off. The fault handling switch 2 itself is also arranged to switch off in dependence of the number of current pulses and has a greater number of current pulses than the other controlled switches, so that a short-circuit fault between the first breaker 90 and the first controlled switch 92 downstream thereof can be handled. If the fault point is between the first breaker 90 and the controlled switch 92, the single-phase switch in the fault handling switch 2 is switched off when the number of current pulses triggering the switching off is reached, i.e. the switches KB2, KC2 are opened, the first breaker 90 is no longer closed.
In one embodiment, the fault handling switch is a three-phase ganged switch, such that when an inter-phase short circuit is handled, the lower port of the first breaker 90 is always simultaneously conducted to the bus three-phase, and a continuously limited current is generated, so that fault handling is performed. This has the advantage that the fault handling switch can be operated as a normal three-phase ganged circuit breaker without the use of a complex switch that only turns on any two phases.
The above embodiments are only a few descriptions of the inventive concept and implementation, and are not limited thereto, and the technical solutions without substantial transformation remain within the scope of protection under the inventive concept.
Claims (8)
1. The three-phase power supply system for rapidly processing interphase short-circuit faults comprises a power supply and a bus, wherein at least one outgoing line is arranged on the bus;
a fault processing switch and a current limiting resistor are arranged between the lower opening of the three-phase linkage circuit breaker and the bus, the fault processing switch can connect two phases or three phases of the lower opening of the three-phase linkage circuit breaker with the bus and connect the two phases or the three phases with the bus in series into the current limiting resistor, and the fault processing switch can detect current information and cut off a line according to the current information.
2. The three-phase power supply system for rapidly handling interphase short-circuit faults according to claim 1, wherein the fault handling switch comprises three single-phase switches positioned in ABC three phases, and each single-phase switch is connected in series with a current limiting resistor.
3. The three-phase power supply system for rapidly handling interphase short-circuit faults according to claim 1, wherein the fault handling switch comprises three single-phase switches positioned in ABC three phases, and wherein one current limiting resistor is connected in series with two single-phase switches, and the other single-phase switches are not connected in series with the current limiting resistor.
4. A three-phase power supply system for quickly handling an interphase short-circuit fault according to claim 2 or 3, wherein the current information is a current duration, the controlled switch trigger cut-off current duration downstream in the power supply direction is shorter than the controlled switch trigger cut-off current duration upstream in the power supply direction, and the single-phase switch trigger cut-off current duration is longer than the controlled switch trigger cut-off current duration.
5. A three-phase power supply system for rapidly handling an interphase short-circuit fault according to claim 2 or 3, wherein the current information is a current pulse number, the single-phase switch can circularly connect and disconnect a phase of a lower opening of the three-phase linkage breaker with a bus, the number of current pulses triggered and cut off by the controlled switch downstream in a power supply direction is smaller than the number of current pulses triggered and cut off by the controlled switch upstream in the power supply direction, and the number of current pulses triggered and cut off by the single-phase switch is larger than the number of current pulses triggered and cut off by the controlled switch.
6. The three-phase power supply system for quickly handling an interphase short-circuit fault according to claim 5, wherein the single-phase switch is an electronic power switch.
7. The three-phase power supply system for fast handling an interphase short circuit fault according to claim 6, wherein the electronic power switch is an insulated gate bipolar transistor.
8. The three-phase power supply system for rapidly handling interphase short-circuit faults according to claim 1, wherein the fault handling switch is a three-phase ganged switch, and wherein the current limiting resistor is connected in series with two or three phases.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321783921.0U CN220234196U (en) | 2023-07-09 | 2023-07-09 | Three-phase power supply system capable of rapidly processing interphase short-circuit fault |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321783921.0U CN220234196U (en) | 2023-07-09 | 2023-07-09 | Three-phase power supply system capable of rapidly processing interphase short-circuit fault |
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| CN220234196U true CN220234196U (en) | 2023-12-22 |
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| CN202321783921.0U Active CN220234196U (en) | 2023-07-09 | 2023-07-09 | Three-phase power supply system capable of rapidly processing interphase short-circuit fault |
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- 2023-07-09 CN CN202321783921.0U patent/CN220234196U/en active Active
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