CN109617030B - Dynamic adaptive overcurrent protection method and system for subway alternating current looped network power supply - Google Patents
Dynamic adaptive overcurrent protection method and system for subway alternating current looped network power supply Download PDFInfo
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- CN109617030B CN109617030B CN201811466182.6A CN201811466182A CN109617030B CN 109617030 B CN109617030 B CN 109617030B CN 201811466182 A CN201811466182 A CN 201811466182A CN 109617030 B CN109617030 B CN 109617030B
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- 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
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/28—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for meshed systems
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Abstract
The invention provides a dynamic adaptive overcurrent protection method and system for subway alternating current looped network power supply. When the communication between the outgoing line protection device and the incoming line protection device in the adjacent power supply interval is abnormal, the action time of the outgoing line protection device for dynamically adapting to the overcurrent protection is prolonged from T1 to T2; if the outgoing line protection device has a fault, the dynamic adaptive overcurrent protection action time of the incoming line protection device on the same bus as the outgoing line protection device is prolonged from T1 to T2, and when the dynamic adaptive overcurrent protection time is delayed to T2, if the fault is not removed, the incoming line protection device acts, so that the problem that the fault removal range is too large is avoided, and the operation reliability of the subway station is improved.
Description
Technical Field
The invention belongs to the technical field of power distribution network protection of a power system, and particularly relates to a dynamic adaptive overcurrent protection method and system for subway alternating-current ring network power supply.
Background
At present, the subway power supply system in China generally adopts a medium-voltage network power supply scheme of 'hand-in-hand' double-ring network wiring. The power supply system can be divided into a small-subarea power supply scheme and a large-subarea power supply scheme according to the number of substations in the subareas. Generally, 3-4 substations are arranged in each subarea of the small-subarea power supply scheme, and more cables are laid in the power supply area, so that the large-subarea power supply scheme is adopted gradually. In a large-partition power supply scheme, 6 or more substations are generally arranged in 1 partition. The backup relation of the medium-voltage network structure in urban rail transit is complex, and the operation mode in actual operation is various. The large-partition power supply protection can reliably act in various operation modes, and the system safety is ensured. The distance between adjacent substations of urban rail transit is short, the line impedance difference of each point of the 35kV looped network is small, and the short-circuit current value difference of different places on the looped network is also small.
In recent years, with the improvement of product performance of primary power supply equipment and the acceleration of urbanization process, a large-partition rail transit power supply system which is low in construction cost and convenient to construct, operate, maintain and manage gradually becomes a trend. For distributed and small-partition medium-voltage alternating-current power supply systems, the protection configuration is relatively simple and is not greatly different from the traditional power system protection configuration; however, the situation of the large-partition ac power supply system is different, and because of the limitation of the fault tolerance time of the primary equipment, the conventional overcurrent protection scheme cannot meet the requirement of selectivity of protection actions in various faults, and particularly when the protection device has a fault or communication is abnormal, the action of the protection device is easy to cut off the equipment which is not in fault.
For example, in fig. 2, according to the existing protection logic, if the communication between the protection device 4 and the protection device 5 is abnormal, when a fault point occurs on the ring network cable between the subway station 3 and the subway station 4, the protection device 4 detects the overcurrent starting judgment signal of the protection device 3, but cannot receive the overcurrent starting judgment signal of the protection device 5, the protection device 4 will judge that the fault point is on the ring network cable between the subway station 2 and the subway station 3, so that the circuit breaker at the fault point will be controlled to be turned off, and the subway station 3 and the subsequent stations will be removed, but the actual fault point is on the ring network cable between the subway station 3 and the subway station 4, so that the subway station 3 without the fault is also removed, which results in an excessively large fault removal range.
Disclosure of Invention
The invention aims to provide a dynamic adaptive overcurrent protection method and system for a subway alternating-current ring network power supply, which are used for solving the problems that in the prior art, the coordination of protection time difference is difficult when a fault is removed in the power supply ring network, and the fault removal range is large due to communication abnormity or fault of a protection device.
In order to achieve the above object, the present invention provides an overcurrent protection method for a power supply system of a subway alternating current ring network, wherein each power supply section in the subway alternating current ring network comprises a first bus and a second bus, the first bus and the second bus are connected through a bus coupler switch, corresponding buses of adjacent power supply sections are connected through a ring network cable, each bus is provided with a protection device having a dynamic adaptive overcurrent protection function, the protection device comprises an incoming line protection device and an outgoing line protection device, if the communication between the outgoing line protection device and the incoming line protection device corresponding to the adjacent power supply section is abnormal, the dynamic adaptive overcurrent protection action delay time of the outgoing line protection device and the incoming line protection device corresponding to the adjacent power supply section is set from T1 to T2; if the outgoing line protection device has a fault, the dynamic adaptive overcurrent protection action delay time of the incoming line protection device corresponding to the outgoing line protection device on the same bus and the adjacent power supply interval is set to be T2 from T1; t2> T1, T1 is the action delay time of dynamic adaptive overcurrent protection when the protection device normally operates.
The invention has the beneficial effects that:
when the communication between the outgoing line protection device and the incoming line protection device in the adjacent power supply interval is abnormal, the dynamic adaptive overcurrent protection action time of the outgoing line protection device is prolonged from T1 to T2, when the time reaches T1, the protection device does not act, and when the time is delayed to T2, if the fault is not removed, the outgoing line protection device acts; if the outgoing line protection device has a fault, the dynamic adaptive overcurrent protection action time of the incoming line protection device on the same bus as the outgoing line protection device is prolonged from T1 to T2, when the time T1 is reached, the incoming line protection device on the same bus as the outgoing line protection device does not act, and when the time is delayed to T2, the incoming line protection device acts if the fault is not cut off. The problem that the fault removal range is too large is avoided, and the operation reliability of the subway station is improved.
In order to avoid cutting off the circuit breaker corresponding to the protection device when the circuit breaker is not in fault, if the incoming line protection device is in fault, the delay time of the dynamic adaptive overcurrent protection action of the outgoing line protection device corresponding to the power supply section adjacent to the incoming line protection device is set to be T2 from T1.
In order to distinguish an intra-area fault from an extra-area fault, the protection device with the dynamic adaptive overcurrent protection function is configured to receive an overcurrent starting judgment signal of a corresponding protection device on an adjacent power supply interval and an overcurrent starting judgment signal of the bus; the protection device detects that the fault current is larger than a dynamic adaptive overcurrent fixed value, dynamic adaptive overcurrent protection is started, and when the protection device normally operates, if two signals received by the protection device are true, the protection device judges that the protection device has an out-of-area fault, and locks the dynamic adaptive overcurrent protection function of the protection device; if the overcurrent starting judgment signal of the corresponding protection device in the adjacent power supply interval received by the protection device is false and the overcurrent starting judgment signal of the bus is true, the fault of the ring network cable in the area is judged, and the protection device acts; and if the overcurrent starting judgment signal of the corresponding protection device in the adjacent power supply interval received by the protection device is true and the overcurrent starting judgment signal of the bus is false, judging that the bus in the area has a fault and operating the protection device.
In order to improve the reliability of the protection device operation, when the dynamic adaptive overcurrent protection operation delay time of the protection device becomes T2, the protection device does not operate when the time T1 is reached, and the protection device operates when the fault is not removed when the time T2 is reached.
And feeder line protection devices are arranged between the first bus and the second bus of each power supply interval and the transformer, the action delay time of the feeder line protection devices is set to be T0, and T1 is greater than T0, so that the action reliability of the feeder line protection devices is improved.
The invention also provides a dynamic adaptive overcurrent protection system for the power supply of the subway alternating-current ring network, wherein each power supply interval in the subway alternating-current ring network comprises a first bus and a second bus, the first bus and the second bus are connected through a bus coupler switch, corresponding buses of adjacent power supply intervals are connected through a ring network cable, a protection device with a dynamic adaptive overcurrent protection function is arranged on each bus, the protection device comprises an incoming line protection device and an outgoing line protection device, and if the communication between the outgoing line protection device and the incoming line protection device corresponding to the adjacent power supply interval is abnormal, the dynamic adaptive overcurrent protection action delay time of the outgoing line protection device and the incoming line protection device corresponding to the adjacent power supply interval is set to be T2 from T1; if the outgoing line protection device has a fault, the dynamic adaptive overcurrent protection action delay time of the incoming line protection device corresponding to the outgoing line protection device on the same bus and the adjacent power supply interval is set to be T2 from T1; t2> T1, T1 is the action delay time of dynamic adaptive overcurrent protection when the protection device normally operates.
The invention has the beneficial effects that:
when the communication between the outgoing line protection device and the incoming line protection device in the adjacent power supply interval is abnormal, the dynamic adaptive overcurrent protection action time of the outgoing line protection device is prolonged from T1 to T2, when the time reaches T1, the protection device does not act, and when the time is delayed to T2, if the fault is not removed, the outgoing line protection device acts; if the outgoing line protection device has a fault, the dynamic adaptive overcurrent protection action time of the incoming line protection device on the same bus as the outgoing line protection device is prolonged from T1 to T2, when the time T1 is reached, the incoming line protection device on the same bus as the outgoing line protection device does not act, and when the time is delayed to T2, the incoming line protection device acts if the fault is not cut off. The problem that the fault removal range is too large is avoided, and the operation reliability of the subway station is improved.
In order to avoid cutting off the circuit breaker corresponding to the protection device when the circuit breaker is not in fault, if the incoming line protection device is in fault, the action delay time of the corresponding outgoing line protection device on the adjacent power supply section of the incoming line protection device is set to be T2 from T1.
In order to distinguish an intra-area fault from an extra-area fault, the protection device with the dynamic adaptive overcurrent protection function is configured to receive an overcurrent starting judgment signal of a corresponding protection device on an adjacent power supply interval and an overcurrent starting judgment signal of the bus; the protection device detects that the fault current is larger than a dynamic adaptive overcurrent fixed value, dynamic adaptive overcurrent protection is started, and when the protection device normally operates, if two signals received by the protection device are true, the protection device judges that the protection device has an out-of-area fault, and locks the dynamic adaptive overcurrent protection function of the protection device; if the overcurrent starting judgment signal of the corresponding protection device in the adjacent power supply interval received by the protection device is false and the overcurrent starting judgment signal of the bus is true, the fault of the ring network cable in the area is judged, and the protection device acts; and if the overcurrent starting judgment signal of the corresponding protection device in the adjacent power supply interval received by the protection device is true and the overcurrent starting judgment signal of the bus is false, judging that the bus in the area has a fault and operating the protection device.
In order to improve the reliability of the protection device operation, when the dynamic adaptive overcurrent protection operation delay time of the protection device becomes T2, the protection device does not operate when the time T1 is reached, and the protection device operates when the fault is not removed when the time T2 is reached.
And feeder line protection devices are arranged between the first bus and the second bus of each power supply interval and the transformer, the action delay time of the feeder line protection devices is set to be T0, and T1 is greater than T0, so that the action reliability of the feeder line protection devices is improved.
Drawings
FIG. 1 is a schematic diagram of signal connections when each protection device of the present invention starts over-current protection;
FIG. 2 is a schematic structural diagram of an AC looped network power supply system of a subway station in the prior art;
FIG. 3 is a logic diagram of the dynamic adaptive overcurrent protection of the present invention;
FIG. 4 is a schematic diagram of fault handling when the subway ring network cable fault communication of the present invention is normal;
FIG. 5 is a schematic diagram of fault handling when communication of a subway ring network cable fault is abnormal according to the present invention;
fig. 6 is a schematic diagram of bus fault processing of the subway power supply system.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings:
embodiment of the overcurrent protection system:
the utility model provides a subway alternating current looped netowrk power supply dynamic adaptation overcurrent protection system, this overcurrent protection system can be used in subway station system, also can use in other main equipments. As shown in fig. 1, the system comprises three subway stations, each subway station corresponds to a power supply section, each power supply section comprises a first bus and a second bus, the first bus and the second bus are connected through a bus coupler switch, the bus coupler switch is a bus coupler breaker, corresponding buses of adjacent power supply sections are connected through a looped network cable, a protection device is arranged in each power supply section, each circuit breaker is correspondingly provided with a protection device, the bus coupler circuit breaker is correspondingly provided with a bus coupler protection device, the protection device comprises an incoming line protection device and an outgoing line protection device, each protection device is configured with a dynamic adaptive overcurrent protection function, as shown in fig. 1, a circuit breaker K1, a circuit breaker K2, a circuit breaker K3, a circuit breaker K4, a circuit breaker K5, a circuit breaker K6, a circuit breaker K7 and a circuit breaker K8 are arranged in the dynamic adaptive overcurrent protection system of the embodiment, the protection device 1 is arranged opposite to, and the other protection devices are paired with other circuit breakers in an analogized mode. The protection device 1, the protection device 3 and the protection device 5 … … are incoming line protection devices, and the protection device 2, the protection device 4 and the protection device 6 … … are outgoing line protection devices. The protection devices 1 and 2, and the protection devices 3 and 4 … … are two protection devices on the same bus respectively. Each protection device dynamically adapts three time step differences of overcurrent protection setting T1 time, T2 time and T3 time, wherein T1 time is dynamic adaptive overcurrent protection action delay time when the protection device normally operates, T3> T2> T1, T3 time means that the protection device does not act after T1 time or T2 time is reached, then the protection device acts again when T3 time is reached, in the embodiment, T1 is 0.4s, T2 is 0.6s, and T3 is 1.2 s.
The outgoing line and the incoming line are opposite, under normal conditions, the system is powered by a left power supply, and the current flows from left to right; when a fault occurs and the fault is removed by the protection device, the backup power supply on the right side is started, and at the moment, for the station on the right side of the fault point, the current flow direction is from right to left, so for the station using the backup power supply, the original outgoing line is changed into the incoming line, the original incoming line is changed into the outgoing line, but the action strategy and the delay time of each protection device are the same as those of the station without the fault.
Each protection device simultaneously receives two groups of overcurrent starting judgment signals, one group is an overcurrent starting judgment signal of the protection device of the circuit breaker on the opposite side of the looped network cable connected with the protection device, the other group is an overcurrent starting judgment signal of the bus, the overcurrent starting judgment signal of the bus comprises an overcurrent starting judgment signal of the protection device of another circuit breaker of the bus where the protection device is located and an overcurrent starting judgment signal of the bus-connected protection device of the bus-connected circuit breaker, and as long as one of the overcurrent starting judgment signal of the protection device of another circuit breaker of the bus where the protection device is located and the overcurrent starting judgment signal of the bus-connected protection device of the bus-connected circuit breaker is received, the overcurrent starting judgment signal of the bus is received.
The embodiment of the overcurrent protection method comprises the following steps:
when the protection device has no fault and the communication between the protection device and the protection device is normal, the protection device starts dynamic adaptive overcurrent protection when detecting that the fault current is larger than a dynamic adaptive overcurrent fixed value, and then if two groups of overcurrent starting judgment signals received by the protection device are true, the dynamic adaptive overcurrent protection of the protection device is locked and judged as an out-of-area fault; as shown in fig. 2, four subway stations are included, taking the protection device 3 as an example, when a fault occurs at a point B, neither the protection device 4 nor the bus-tie protection device has an overcurrent starting judgment signal; when a fault occurs at the point a, both the protection device 4 and the bus coupler protection device have an overcurrent starting judgment signal, and considering that the bus coupler protection device may be in a separated position or a closed position in practice, the overcurrent starting judgment signal is not generated when the bus coupler protection device is in the separated position, and the corresponding overcurrent starting judgment signal is sent according to whether the fault is generated when the bus coupler protection device is in the closed position, so that for the protection device 3, the overcurrent starting judgment signal of the bus is true only when the overcurrent starting judgment signal of the protection device 4 is at least received.
If one of the two groups of overcurrent starting judgment signals received by the protection device is true and the other group of overcurrent starting judgment signals is false, judging the protection device to be an intra-area fault, wherein the signals are false and have different meanings from the meanings of the protection device which cannot receive the signals of the fault protection device when the protection device has a fault or has abnormal communication, and if the overcurrent starting judgment signals of the protection device of the opposite side circuit breaker (the opposite side circuit breaker refers to the circuit breaker corresponding to the protection device in the adjacent power supply interval) are false, judging the circuit breaker to be an intra-area ring network cable fault, and controlling the corresponding circuit breaker to be disconnected by the corresponding protection device and the protection device of the opposite side circuit breaker; if the overcurrent starting judgment signal of the bus is false, the bus is judged to be a fault, and the protection device controls the bus tie breaker to be disconnected; the dynamic adaptive overcurrent protection of the protection device cuts off the fault through a T1 delay quick action outlet, and the opposite side circuit breaker or the bus-coupled circuit breaker is in coupled tripping according to the fault judgment result.
When the protection devices are in fault or communication between the protection devices is abnormal, firstly, the overcurrent protection function of the corresponding protection device which dynamically adapts to the overcurrent protection T1 time is locked, the overcurrent protection function of the protection devices T2 time is started, T2> T1, and the protection time of the protection devices of other circuit breakers is unchanged.
Taking the subway station 2 as an example, the dynamic adaptive overcurrent protection method of the invention is further explained:
the dynamic adaptive overcurrent protection method of the embodiment mainly includes three aspects, namely a protection strategy when communication among the protection devices is normal, a protection strategy when communication is abnormal, and a protection strategy when the protection devices have faults. Table 1 shows protection policies for normal communications and protection policies for abnormal communications among the protection devices.
TABLE 1
According to the table 1, the protection strategies when the communication between the protection devices is normal and no protection device fails are analyzed:
1) if the looped network cable between the subway stations has a fault, according to the diagram shown in fig. 4, the dynamic adaptive overcurrent protection logic determines that a fault point is located in or out of a region by comparing a current starting signal of the device with a current starting signal of an opposite side device. For example, when a fault occurs at the point a and the communication between the protection devices is normal, at this time, the protection device 4 detects that the fault current is greater than the "dynamic adaptive overcurrent fixed value" and the received overcurrent starting judgment signal of the protection device 5 corresponding to the adjacent power supply section of the looped network cable is false, the protection device 4 satisfies the looped network cable fault judgment logic shown in fig. 3 so as to judge that the fault point occurs in the section, and the dynamic adaptive overcurrent protection T1 configured by the protection device 4 acts to trip the outlet tripping circuit breaker K4 and the tripping circuit breaker K5 in parallel to complete fault isolation. And other protection devices on the line judge that the fault point occurs outside the area, and the dynamic adaptive overcurrent protection T1 is locked to protect the circuit from action.
2) According to the bus fault of the subway station, as shown in fig. 6, the fault occurs at the point B, the communication between the protection devices is normal, at this time, the protection device 3 detects that the fault current is larger than the dynamic adaptive overcurrent fixed value, and the received overcurrent starting judgment signal of the protection device 4 is false, then the protection device 3 meets the bus fault judgment logic shown in fig. 3 so as to judge that the fault point occurs in the area, the dynamic adaptive overcurrent protection T1 configured by the protection device 3 acts to open the outlet tripping circuit breaker K3, the tripping circuit breaker K4 is connected in parallel with the bus-coupled circuit breaker of the subway station 2, and the fault isolation is completed. And other devices on the line judge that the fault point occurs out of the area, and the dynamic adaptive overcurrent protection T1 time is locked, so that the protection does not act.
3) If the fault occurs at the point C, the protection device 3 starts overcurrent protection and receives an overcurrent starting judgment signal of the protection device 4 as true, the protection device 4 starts dynamic adaptive overcurrent protection and receives an overcurrent starting judgment signal of the protection device 5 as true, the dynamic adaptive overcurrent protection T1 time of the protection device 3 and the protection device 4 does not act, and at the moment, the fault is disconnected from a circuit breaker at the upstream of the fault point C through a feeder line protection action outlet.
4) If the fault occurs at the point D, the protection device 3 and the protection device 4 start the dynamic adaptive overcurrent protection, and both the received two sets of judgment signals are true, the dynamic adaptive overcurrent protection T1 does not operate in time, and the protection device 7 dynamically adapts to the overcurrent protection T1 to operate in time.
Analyzing a protection strategy of communication abnormity between the outgoing line protection device and the incoming line protection device in the adjacent power supply interval:
if the communication between the outgoing line protection device and the incoming line protection device corresponding to the adjacent power supply interval is abnormal, the dynamic adaptive overcurrent protection action delay time of the outgoing line protection device and the incoming line protection device corresponding to the adjacent power supply interval is set to be T2 from T1; referring to fig. 2 and 5, if the communication between the protection device 4 and the protection device 5 is abnormal, the delay time of the dynamic adaptive overcurrent protection operation of the protection device 4 and the protection device 5 is prolonged from T1 to T2. If a fault occurs at the point A, namely a fault occurs in a ring network cable between the subway station 2 and the subway station 3, the protection device 4 generates an overcurrent starting judgment signal, the overcurrent starting judgment signal acts after the time delay T2, and after the time T1 is reached, if the fault is removed, the system is recovered to be normal, and the protection device 4 does not act any more after the time T2 is reached; if the fault occurs on the looped network cable between the subway station 3 and the subway station 4, the action delay time of the protection device 4 is prolonged from T1 to T2, the action time of the protection device 6 is set to T1, and after the time T1 is reached, the protection device 6 controls the corresponding breaker K6 to act, so that the subway station 4 is cut off.
If the fault occurs at the point B, as shown in fig. 6, that is, the bus of the subway station 2 has a fault, the dynamic adaptive overcurrent protection of the protection device 4 is not started, and at this time, the protection device 3 trips to the corresponding breaker K3 after the time T2 elapses.
If the fault occurs at the point C, the protection device 3 starts overcurrent protection, the overcurrent protection T2 action logic is met, but the protection 0.2s of the feeder line where the fault point is located cuts off the fault for the time T2 which does not reach the overcurrent protection of the protection device 3, so that only the feeder line where the fault point is located does protection and cuts off the fault, the circuit breaker corresponding to the feeder line protection device is disconnected, and other devices do not protect the action outlet.
If the fault occurs at the point D, the protection device 7 meets the bus fault judgment logic shown in the figure 3 at the moment, after the time delay of T1, the breaker K7 is disconnected, the fault is removed, and at the moment, the T2 protection of the protection device 3 and the protection device 4 cannot be operated because the protection device 3 and the protection device 4 do not reach the T2 operation time.
The analysis process of the protection strategy when the outgoing line protection device has a fault is as follows:
if the outgoing line protection device has a fault, the delay time of the dynamic adaptive overcurrent protection action of the incoming line protection device on the same bus as the outgoing line protection device is set to be T2 from T1; t2> T1, T1 is dynamic adaptive overcurrent protection action delay time when the protection device operates normally. As shown in fig. 2, if a fault occurs in the protection device 4 and the fault occurs at point a, the operation delay time of the protection device 3 is prolonged from T1 to T2, and when the time reaches T2, the protection device 3 controls the corresponding breaker K3 to operate, so as to cut off the subway station 3.
If the fault occurs at the point B, as shown in fig. 6, that is, the bus of the subway station 2 has a fault, the protection device 4 does not participate in any judgment process because of the fault, and at this time, the protection device 3 dynamically adapts to the tripping of the corresponding breaker K3 after the overcurrent protection reaches the time T2.
If the fault occurs at the point C, the protection device 3 starts dynamic adaptive overcurrent protection, the overcurrent protection T2 action logic is met, but the protection 0.2s of the feeder line where the fault point is located cuts off the fault for the time T2 which cannot reach the overcurrent protection of the protection device 3, so that only the feeder line where the fault point is located acts and cuts off the fault at the moment, the circuit breaker corresponding to the feeder line protection device is disconnected, and other devices do not act as an outlet.
If the fault occurs at the point D, the protection device 7 meets the bus fault judgment logic shown in fig. 3, after the time delay of T1, the circuit breaker K7 is turned off to remove the fault, and at this time, because the protection device 3 and the protection device 4 dynamically adapt to the situation that the overcurrent protection does not reach the action time of T2, the protection device 3 and the protection device 4 dynamically adapt to the situation that the overcurrent protection T2 protects the protection from being disabled.
Similarly, if the communication between the incoming line protection device and the outgoing line protection device in the adjacent power supply interval is abnormal, the delay time of the dynamic adaptive overcurrent protection action of the incoming line protection device and the corresponding outgoing line protection device in the adjacent power supply interval is set to be T2 from T1; t2> T1; if the incoming line protection device has a fault, the dynamic adaptive overcurrent protection action delay time of the outgoing line protection device corresponding to the incoming line protection device on the same bus and the adjacent power supply interval is set to be T2 from T1. When the communication between the incoming line protection device and the outgoing line protection device in the adjacent power supply interval is abnormal or the incoming line protection device has a fault, the overcurrent protection starting process and the control cutting-off process for the subsequent power supply process of the subway station are similar to the above process, and therefore, the detailed description is omitted here.
The specific embodiments are given above, but the present invention is not limited to the above-described embodiments. The basic idea of the present invention lies in the above basic scheme, and it is obvious to those skilled in the art that no creative effort is needed to design various modified models, formulas and parameters according to the teaching of the present invention. Variations, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit of the invention, and still fall within the scope of the invention.
Claims (10)
1. A subway alternating current looped network power supply dynamic adaptation overcurrent protection method, every power supply interval includes the first bus and second bus in the subway alternating current looped network, connect through the bus tie switch between the first bus and second bus, the correspondent bus of the adjacent power supply interval passes the cable connection of the looped network, there is a protective device with function of dynamic adaptation overcurrent protection on every bus, the protective device includes protective device of incoming line and protective device of outgoing line, characterized by that, if the communication between protective device of outgoing line and corresponding incoming line protective device of the adjacent power supply interval is abnormal, the protective device of dynamic adaptation overcurrent protection of the incoming line protective device and corresponding incoming line protective device on its adjacent power supply interval acts the delay time and is set as T2 from T1; if the outgoing line protection device has a fault, the dynamic adaptive overcurrent protection action delay time of the incoming line protection device corresponding to the outgoing line protection device on the same bus and the adjacent power supply interval is set to be T2 from T1; t2> T1, T1 is the action delay time of dynamic adaptive overcurrent protection when the protection device normally operates.
2. The method according to claim 1, wherein if the incoming line protection device fails, the delay time of the dynamic adaptive overcurrent protection action of the outgoing line protection devices corresponding to the same bus and the adjacent power supply sections of the incoming line protection device is set from T1 to T2.
3. The subway alternating-current ring network power supply dynamic adaptation overcurrent protection method according to claim 1 or 2, wherein the protection device with the dynamic adaptation overcurrent protection function receives an overcurrent starting judgment signal of a corresponding protection device on an adjacent power supply section and an overcurrent starting judgment signal of the bus; the protection device detects that the fault current is larger than a dynamic adaptive overcurrent fixed value, dynamic adaptive overcurrent protection is started, and when the protection device normally operates, if two signals received by the protection device are true, the protection device judges that the protection device has an out-of-area fault, and locks the dynamic adaptive overcurrent protection function of the protection device; if the overcurrent starting judgment signal of the corresponding protection device in the adjacent power supply interval received by the protection device is false and the overcurrent starting judgment signal of the bus is true, the fault of the ring network cable in the area is judged, and the protection device acts; and if the overcurrent starting judgment signal of the corresponding protection device in the adjacent power supply interval received by the protection device is true and the overcurrent starting judgment signal of the bus is false, judging that the bus in the area has a fault and operating the protection device.
4. The method for dynamic adaptive overcurrent protection of AC ring network power supply in subway according to claim 2, wherein when the delay time of dynamic adaptive overcurrent protection action of the protection device becomes T2, the protection device does not act when T1 is reached, and the protection device acts when T2 is reached if the fault is not removed.
5. The method for dynamic adaptive overcurrent protection of AC looped network power supply of subway according to claim 4, wherein feeder line protection devices are arranged between the first bus and the second bus of each power supply section and the transformer, and the action delay time of the feeder line protection devices is set as T0, T1> T0.
6. A subway alternating current looped network power supply dynamic adaptation overcurrent protection system is disclosed, wherein each power supply interval in the subway alternating current looped network comprises a first bus and a second bus, the first bus and the second bus are connected through a bus coupler switch, corresponding buses in adjacent power supply intervals are connected through a looped network cable, a protection device with a dynamic adaptation overcurrent protection function is arranged on each bus, and the protection device comprises an incoming line protection device and an outgoing line protection device, and the subway alternating current looped network power supply dynamic adaptation overcurrent protection system is characterized in that if the communication between the outgoing line protection device and the incoming line protection device corresponding to the adjacent power supply interval is abnormal, the dynamic adaptation overcurrent protection action delay time of the outgoing line protection device and the incoming line protection device corresponding to the adjacent power supply interval is set to be T2 from T1; if the outgoing line protection device has a fault, the dynamic adaptive overcurrent protection action delay time of the incoming line protection device corresponding to the outgoing line protection device on the same bus and the adjacent power supply interval is set to be T2 from T1; t2> T1, T1 is the action delay time of dynamic adaptive overcurrent protection when the protection device normally operates.
7. The AC ring network power supply dynamic adaptive overcurrent protection system for subways according to claim 6, wherein if an incoming line protection device fails, the delay time of the dynamic adaptive overcurrent protection action of the outgoing line protection devices corresponding to the same bus of the incoming line protection device and the adjacent power supply sections is set from T1 to T2.
8. The subway alternating-current ring network power supply dynamic adaptation overcurrent protection system according to claim 6 or 7, wherein the protection device with the dynamic adaptation overcurrent protection function receives an overcurrent starting judgment signal of a corresponding protection device in an adjacent power supply interval and an overcurrent starting judgment signal of the bus; the protection device detects that the fault current is larger than a dynamic adaptive overcurrent fixed value, dynamic adaptive overcurrent protection is started, and when the protection device normally operates, if two signals received by the protection device are true, the protection device judges that the protection device has an out-of-area fault, and locks the dynamic adaptive overcurrent protection function of the protection device; if the overcurrent starting judgment signal of the corresponding protection device in the adjacent power supply interval received by the protection device is false and the overcurrent starting judgment signal of the bus is true, the fault of the ring network cable in the area is judged, and the protection device acts; and if the overcurrent starting judgment signal of the corresponding protection device in the adjacent power supply interval received by the protection device is true and the overcurrent starting judgment signal of the bus is false, judging that the bus in the area has a fault and operating the protection device.
9. The AC ring network power supply dynamic adaptive overcurrent protection system for subways as recited in claim 7, wherein when the dynamic adaptive overcurrent protection action delay time of the protection device becomes T2, the protection device does not act when the T1 is reached, and the protection device acts when the T2 is reached if the fault is not removed.
10. The ac looped network power supply dynamic adaptive overcurrent protection system of claim 9, wherein a feeder protection device is provided between the transformer and the first bus and the second bus of each power supply section, and the action delay time of the feeder protection device is set to T0, T1> T0.
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