CN112034393A - Contact network power supply main loop breakpoint diagnosis method and system - Google Patents
Contact network power supply main loop breakpoint diagnosis method and system Download PDFInfo
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Abstract
The embodiment of the invention provides a contact network power supply main loop breakpoint diagnosis method and a system, wherein the method comprises the following steps: acquiring the current of an uplink breaker, the current of a downlink breaker and the current of a circuit breaker in a subarea in a target contact network; and judging whether a breakpoint exists in the target contact network or not according to the current of the uplink breaker, the current of the downlink breaker and the current of the circuit breaker in the subarea. According to the breakpoint diagnosis method and system for the power supply main loop of the overhead line system, provided by the embodiment of the invention, whether a breakpoint exists in a target overhead line system is judged according to the current condition by acquiring the current of an uplink breaker, the current of a downlink breaker and the current of a circuit breaker in a subarea in real time, so that the purposes of timely finding abnormal conditions in the power supply loop and finding hidden dangers in advance are achieved.
Description
Technical Field
The invention relates to the technical field of electronics, in particular to a contact network power supply main loop breakpoint diagnosis method and system.
Background
The overhead contact system is an important component of a traction power supply system, is a special power supply circuit which is peculiar to an electrified railway, is erected along a rail and provides power for an electric locomotive or an electric motor train unit, and due to the structural particularity, no reserve property and sensitivity to the operating environment, the generated faults are complex and various.
Aiming at the problem that the current of a main conductive loop is not smooth, the current, the voltage and other related electrical parameters of specific equipment can only be monitored in the conventional traction power supply system, but under the conditions that tail end parallel-loop power supply is performed or various standby operation modes are started, part of hidden faults cannot be exposed, hidden faults are buried, and once the hidden faults cannot be found in time, larger faults or accidents in subsequent brewing can be caused.
Disclosure of Invention
In order to solve the above problems, embodiments of the present invention provide a method and a system for diagnosing a breakpoint of a power supply main loop of a contact network.
In a first aspect, an embodiment of the present invention provides a contact network power supply main loop breakpoint diagnosis method, including:
the method comprises the steps that the current of an uplink breaker, the current of a downlink breaker and the current of a subarea substation breaker in a target contact network are obtained, wherein the target contact network comprises an uplink feeder line and a downlink feeder line, a traction substation is located at one end of the target contact network, the subarea substation is located at the other end of the target contact network, the traction substation is connected with the uplink feeder line through the uplink breaker, the traction substation is connected with the downlink feeder line through the downlink breaker, the subarea substation is connected with the uplink feeder line and the downlink feeder line through the subarea substation breaker, and the uplink breaker, the downlink breaker and the subarea substation breaker are all in an on-position;
and judging whether a breakpoint exists in the target contact network or not according to the current of the uplink breaker, the current of the downlink breaker and the current of the circuit breaker in the subarea.
Preferably, the determining, according to the current of the uplink breaker, the current of the downlink breaker, and the current of the circuit breaker in the partition, whether a breakpoint exists in the target catenary specifically includes:
acquiring a logic combination value of the target overhead contact system, wherein the logic combination value is a decimal value corresponding to a target binary system, the target binary system is formed by sequentially combining the current of the downlink circuit breaker, the current of the uplink circuit breaker and the current of the circuit breaker in the subarea according to a sequence from a high position to a low position, and the current of the downlink circuit breaker, the current of the uplink circuit breaker and the current of the circuit breaker in the subarea are 1 or 0;
and if the logic combination value is an abnormal value all the time within a preset delay time period, determining whether a breakpoint exists in the target contact network or not according to the logic combination value.
Preferably, the determining whether a breakpoint exists in the target catenary according to the logical combination value specifically includes:
and if the logic combination value is one of 2, 4 and 6, judging that a breakpoint exists in the target overhead contact system but the uplink and the downlink cannot be distinguished.
Preferably, the determining whether a breakpoint exists in the target catenary according to the logical combination value specifically includes:
and if the logic combination value is 7 and the voltage of the partition is lower than a preset voltage threshold, judging that a breakpoint exists in the target overhead contact system.
Preferably, the determining whether a breakpoint exists in the target catenary according to the logical combination value specifically includes:
and if the logic combination value is 3, judging that a breakpoint exists in a downlink feeder line of the target contact network.
Preferably, the determining whether a breakpoint exists in the target catenary according to the logical combination value specifically includes:
and if the logic combination value is 5, judging that a breakpoint exists in an uplink feeder line of the target contact network.
Preferably, the current of the downlink circuit breaker, the current of the uplink circuit breaker, and the current of the circuit breaker in the partition are 1 or 0, and are specifically determined by the following method:
if the current of the downlink circuit breaker is smaller than a preset current threshold value, setting the current of the downlink circuit breaker to be 0, otherwise, setting the current of the downlink circuit breaker to be 1;
if the current of the uplink breaker is smaller than the preset current threshold, setting the current of the uplink breaker to be 0, otherwise, setting the current of the uplink breaker to be 1;
and if the current of the circuit breaker in the subarea is smaller than the preset current threshold value, setting the current of the circuit breaker in the subarea to be 0, otherwise, setting the current of the circuit breaker in the subarea to be 1.
In a second aspect, an embodiment of the present invention provides a system for diagnosing a breakpoint of a main power supply loop of a contact network, including:
the measurement module is used for acquiring current of an uplink breaker, current of a downlink breaker and current of a substation breaker in a target contact network, wherein the target contact network comprises an uplink feeder line and a downlink feeder line, a traction substation is located at one end of the target contact network, a substation is located at the other end of the target contact network, the traction substation is connected with the uplink feeder line through the uplink breaker, the traction substation is connected with the downlink feeder line through the downlink breaker line, the substation is respectively connected with the uplink feeder line and the downlink feeder line through the substation breaker, and the uplink breaker, the downlink breaker and the substation breaker are all in a closed position;
and the diagnosis module is used for judging whether a breakpoint exists in the target contact network or not according to the current of the uplink breaker, the current of the downlink breaker and the current of the circuit breaker in the subarea.
In a third aspect, an embodiment of the present invention provides an electronic device, which includes a memory, a processor, and a computer program that is stored in the memory and is executable on the processor, where the processor executes the computer program to implement the steps of the method for diagnosing the breakpoint of the power supply main loop of the overhead contact system according to the first aspect of the present invention.
In a fourth aspect, an embodiment of the present invention provides a non-transitory computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the method for diagnosing a breakpoint of a power supply main circuit of a catenary.
According to the breakpoint diagnosis method and system for the power supply main loop of the overhead line system, provided by the embodiment of the invention, whether a breakpoint exists in a target overhead line system is judged according to the current condition by acquiring the current of an uplink breaker, the current of a downlink breaker and the current of a circuit breaker in a subarea in real time, so that the purposes of timely finding abnormal conditions in the power supply loop and finding hidden dangers in advance are achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description will be given below of the drawings required for the embodiments or the technical solutions in the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a flowchart of a breakpoint diagnosis method for a main power supply loop of a contact network according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a connection relationship among a traction substation, a regional substation, a target catenary, an uplink breaker, a downlink breaker, and a regional substation breaker in the embodiment of the present invention;
fig. 3 is a schematic structural diagram of a catenary when both an uplink feeder line and a downlink feeder line have no locomotive load in the embodiment of the invention;
fig. 4 is a schematic structural view of a contact network when an uplink point a is close to a side with a train and a downlink point b is not in the train of a traction substation in the embodiment of the invention;
fig. 5 is a schematic structural view of a contact network when an uplink point a is close to a vehicle on the side of a subarea and a downlink point a is not in a vehicle state in the embodiment of the invention;
FIG. 6 is a schematic structural view of a catenary with vehicles at the front and at the back of an uplink point A and without vehicles at the downlink in the embodiment of the invention;
fig. 7 is a schematic structural view of an overhead line system in the embodiment of the invention when there is no vehicle in the uplink and there is a vehicle in the downlink;
fig. 8 is a schematic structural view of an overhead line system when an uplink point a is close to a station side and a downlink point a is close to a station side;
fig. 9 is a schematic structural view of an overhead line system when an ascending point a approaches a vehicle on the side of a partition and a descending vehicle is present in the embodiment of the present invention;
fig. 10 is a schematic structural view of a catenary with vehicles at the front and rear of an uplink breakpoint and vehicles at the rear of the uplink breakpoint in the embodiment of the invention;
fig. 11 is a flowchart of a contact network power supply main circuit breakpoint diagnosis method in the embodiment of the present invention;
fig. 12 is a schematic structural diagram of a breakpoint diagnosis system of a power supply main circuit of a contact network according to an embodiment of the present invention;
fig. 13 is a schematic physical structure diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a flowchart of a contact network power supply main loop breakpoint diagnosis method provided in an embodiment of the present invention, and as shown in fig. 1, the method includes:
the contact network power supply leading loop breakpoint diagnosis method provided by the embodiment of the invention only aims at the condition that a grounding short circuit fault is not formed in suspension after the disconnection, and if the short circuit fault is caused, the feeder protection of a substation can be immediately tripped.
In addition, only when the uplink circuit breaker, the downlink circuit breaker and the subarea substation circuit breaker of the traction substation are all in closed positions and the power supply arm is in parallel operation at the tail end of the compound line (namely the situation that the uplink feeder line, the downlink feeder line and the subarea substation supply power simultaneously), the disconnection fault of the contact network can be judged according to the current relationship of the feeder lines.
If the power supply arm is not in the operation mode that the tail ends of the compound lines are connected in parallel, the disconnection fault of the contact network cannot be judged, in this case, when the locomotive drives into the non-electricity section, the locomotive can automatically stop, and whether disconnection occurs can be judged manually through information fed back by the line regulator.
S1, obtaining current of an uplink breaker, current of a downlink breaker and current of a subarea substation breaker in a target contact network, wherein the target contact network comprises an uplink feeder line and a downlink feeder line, a traction substation is located at one end of the target contact network, the subarea substation is located at the other end of the target contact network, the traction substation is connected with the uplink feeder line through the uplink breaker, the traction substation is connected with the downlink feeder line through the downlink breaker, the subarea substation breaker is respectively connected with the uplink feeder line and the downlink feeder line through the subarea substation breaker, and the uplink breaker, the downlink breaker and the subarea substation breaker are all in closed position;
fig. 2 is a schematic diagram of a connection relationship between a traction substation, a target catenary, an uplink breaker, a downlink breaker, and a substation breaker in the embodiment of the present invention, where as shown in fig. 2, 212 denotes an uplink breaker, 211 denotes a downlink breaker, and 271 denotes a substation breaker, and it can be seen from the diagram that an uplink feeder, a downlink feeder, and a substation of the target catenary are all in a state of supplying power simultaneously, and each breaker is in a closed position, so as to satisfy a precondition for implementing the method.
And acquiring the current of the uplink breaker, the current of the downlink breaker and the current of the circuit breaker in the subarea.
Under normal conditions, when the locomotive loads are on the uplink feeder line and the downlink feeder line or only one side of the locomotive loads is on any side, the uplink 212 breaker and the downlink 211 breaker simultaneously supply current to the locomotive, and the 271 breaker of the subarea station also has current flowing through.
The ascending circuit breaker and the descending circuit breaker in the traction substation are main circuit breakers, generally, each main circuit breaker can be simultaneously provided with a standby circuit breaker, when a certain circuit breaker of the substation breaks away from the main circuit breaker, and the standby circuit breaker is switched in, the position signal and the current of the standby circuit breaker can be converted and used for judgment and comparison in an automatic identification mode.
And S2, judging whether a breakpoint exists in the target contact net or not according to the current of the uplink breaker, the current of the downlink breaker and the current of the breaker in the subarea.
Because the current condition of each breaker is different under the two conditions of the existence of the breakpoint and the absence of the breakpoint in the target contact network, the positions of the breakpoints are different, and the current of the uplink breaker, the current of the downlink breaker and the current of the breaker in the subarea are also different, whether the breakpoint exists in the target contact network can be determined according to the specific condition of the current in each breaker, and even the positions of the breakpoints can be determined under some conditions.
According to the breakpoint diagnosis method for the power supply main loop of the overhead line system, provided by the embodiment of the invention, whether a breakpoint exists in a target overhead line system is judged according to the current condition by acquiring the current of an uplink breaker, the current of a downlink breaker and the current of a partitioned breaker in the target overhead line system in real time, so that the purposes of timely finding abnormal conditions in the power supply loop and finding hidden dangers in advance are achieved.
In order to research the specific relation between the current of the uplink breaker, the current of the downlink breaker, the current of the circuit breaker in the subarea and the target contact net breakpoint, the embodiment of the invention firstly analyzes the conditions of various breakpoints one by one.
Taking the uplink feeder line broken at point a as an example, the current distribution relationship and the voltage conditions of the subareas under the broken line condition are as follows:
(1) fig. 3 is a schematic view of a contact network structure when both the uplink feeder line and the downlink feeder line have no locomotive load in the embodiment of the present invention, as shown in fig. 3, in this case, the uplink 212 circuit breaker, the downlink 211 circuit breaker, and the partition 271 circuit breaker have no load current, and the same operation condition as that in the normal idle state, it cannot be determined whether the contact network has a broken line.
(2) Fig. 4 is a schematic structural diagram of the overhead line system when a vehicle is present at the upstream point a close to the traction substation side and a vehicle is absent in the downstream side in the embodiment of the present invention, as shown in fig. 4, in this case, there is a flow at 212, and there is no flow at 211, 271, it can be determined that there is a disconnection on the overhead line of the overhead line.
(3) Fig. 5 is a schematic structural view of an overhead line system when an upstream point a is close to a vehicle on the side of a bay and a downstream point a is not in a vehicle in the embodiment of the present invention, as shown in fig. 5, in this case, there are currents in 211 and 271, and there is no current in 212, which can determine that there is a disconnection in the overhead line system.
(4) Fig. 6 is a schematic structural view of a catenary with vehicles at the front and rear of an uplink point a and without vehicles at the downlink in the embodiment of the invention, as shown in fig. 6, in this case, 211, 212, and 271 all have currents, which are the same as the operation conditions during normal power supply, and it cannot be determined through the currents that the catenary has a broken line. If the voltage of the sub-area is lower than the lowest value of normal parallel operation, the disconnection can be judged.
The minimum value of the network voltage of each power supply arm partition needs to be obtained through statistics and analysis of historical data.
(5) Fig. 7 is a schematic diagram of a contact network structure when there is no vehicle in the ascending and vehicle in the descending in the embodiment of the present invention, as shown in fig. 7, in this case, the current exists in the circuit breaker in the descending 211, and the current does not exist in the circuit breaker in the ascending 212 and the circuit breaker in the district station 271, and it can be determined that there is a disconnection in the ascending contact network.
(6) Fig. 8 is a schematic structural view of a catenary with an ascending point a close to a substation side and a descending line with a vehicle in the embodiment of the present invention, as shown in fig. 8, in this case, both a descending 211 circuit breaker and an ascending 212 circuit breaker have currents, and it can be determined that the catenary has a broken line, but it cannot be determined whether the broken point is the ascending catenary or the descending catenary.
(7) Fig. 9 is a schematic structural view of a contact network when an uplink point a is close to a vehicle at the partition side and a downlink point a is close to a vehicle at the partition side in the embodiment of the present invention, as shown in fig. 9, in this case, an uplink 212 circuit breaker has no current, and a downlink 211 circuit breaker and a partition 271 circuit breaker have current, and it can be determined that the uplink contact network has a broken line. The voltage of the partition is also lower than normal at this time.
(8) Fig. 10 is a schematic structural view of a catenary with vehicles before and after an uplink breakpoint and vehicles in a downlink breakpoint in the embodiment of the present invention, as shown in fig. 10, in this case, a downlink 211 circuit breaker, an uplink 212 circuit breaker, and a zone 271 circuit breaker all have currents, which are not different from normal operation conditions, and a disconnection fault cannot be determined through a current relationship, but at this time, the voltage of a zone is lower than a normal value.
Through the analysis, the comprehensive judgment needs to be carried out by combining the positions and the currents of the feeder circuit breakers of the traction substation and the subareas, and sometimes, the comprehensive comparison needs to be carried out by combining the voltages of the subareas.
Table 1 is a schematic table of determining disconnection fault of an uplink feeder line in the embodiment of the present invention, and table 2 is a schematic table of determining disconnection fault of a downlink feeder line in the embodiment of the present invention, where "/" of voltages of partitions in the table indicates that the voltages of partitions are not needed to participate in the determination, and "abnormal" indicates that the voltages of the partitions are abnormal, which is summarized as shown in tables 1 and 2:
TABLE 1
As can be seen from the above table, when the combination result is 0, it cannot be determined whether there is a wire break; when the combination result is 2, 4, 5 and 6, the uplink is considered to have broken line; if the combination result is 7, the voltage condition of the partition needs to be combined, and if the voltage is abnormal, the disconnection is considered.
Similarly, assuming that the downlink catenary is broken at point B, the following conclusion can be summarized by referring to the judgment scheme of the uplink broken line:
TABLE 2
As can be seen from the above table, when the combination result is 0, it cannot be determined whether there is a wire break; when the combination result is 2, 3, 4, 5 and 6, the downlink contact net is considered to have broken lines; if the combination result is 7, the voltage condition of the partition needs to be combined, and if the voltage is abnormal, the downlink is considered to have broken lines.
On the basis of the foregoing embodiment, preferably, the determining whether there is a breakpoint in the target catenary according to the current of the uplink breaker, the current of the downlink breaker, and the current of the circuit breaker in the partition includes:
acquiring a logic combination value of the target overhead contact system, wherein the logic combination value is a decimal value corresponding to a target binary system, the target binary system is formed by sequentially combining the current of the downlink circuit breaker, the current of the uplink circuit breaker and the current of the circuit breaker in the subarea according to a sequence from a high position to a low position, and the current of the downlink circuit breaker, the current of the uplink circuit breaker and the current of the circuit breaker in the subarea are 1 or 0;
and if the logic combination value is an abnormal value all the time within a preset delay time period, determining whether a breakpoint exists in the target contact network or not according to the logic combination value.
Specifically, a target binary system is composed according to the current of the uplink circuit breaker, the current of the downlink circuit breaker and the current of the circuit breaker in the partition, and the target binary system is sequentially the current of the downlink circuit breaker, the current of the uplink circuit breaker and the current of the circuit breaker in the partition from a high order to a low order, for example, if the current of the downlink circuit breaker is 1, the current of the uplink circuit breaker is 0, and the current of the circuit breaker in the partition is 0, then the corresponding target binary system is 100, then the decimal system corresponding to the target binary system is 4, and then the logical combination value is 4.
Because the longest action time of relay protection when a target contact network short-circuit fault is avoided, the longest action time limit of protection of a substation is generally 1 second, the preset delay time period is set to be 2-5 seconds in the embodiment of the invention.
By increasing the preset delay time, misjudgment caused by the short-circuit fault of the target contact network can be avoided, if the logic combination value is not changed in the period of time, the logic combination value is stable, the possibility of the short-circuit fault of the target contact network is avoided, and whether a breakpoint exists in the target contact network is determined according to the logic combination value.
On the basis of the foregoing embodiment, preferably, the determining whether a breakpoint exists in the target catenary according to the logical combination value specifically includes:
and if the logic combination value is one of 2, 4 and 6, judging that a breakpoint exists in the target overhead contact system but the uplink and the downlink cannot be distinguished.
As can be seen from tables 1 and 2, under some load conditions, the calculation results of the uplink disconnection and the downlink disconnection are the same, and it is not possible to distinguish whether the uplink disconnection or the downlink disconnection occurs.
When the calculation results are 2, 4 and 6, the disconnection fault can be considered, but whether the disconnection point is an upstream contact network or a downstream contact network cannot be distinguished.
On the basis of the foregoing embodiment, preferably, the determining whether a breakpoint exists in the target catenary according to the logical combination value specifically includes:
and if the logic combination value is 7 and the voltage of the partition is lower than a preset voltage threshold, judging that a breakpoint exists in the target overhead contact system.
Specifically, when the calculation result is 7, if the voltage of the partition is also lower than the preset voltage threshold, it is considered that there is a disconnection fault, but the uplink and the downlink cannot be distinguished. The predetermined voltage threshold is a historical minimum Umin, which may be selected from historical data.
The lowest net voltage is the lowest historical value under normal end parallel conditions. The voltage of the subarea is influenced by factors such as system capacity, system parameters, contact network impedance parameters, length of power supply arms, locomotive load conditions and the like of an external power supply, each power supply arm is different, and an accurate result is difficult to obtain through data calculation. The best method is to collect and count historical load data of each power supply arm in the past and take an appropriate value from the historical load data.
On the basis of the foregoing embodiment, preferably, the determining whether a breakpoint exists in the target catenary according to the logical combination value specifically includes:
and if the logic combination value is 3, judging that a breakpoint exists in a downlink feeder line of the target contact network.
As can be seen from the above table, when the calculation result is 3, it is considered that there is a disconnection in the downstream.
On the basis of the foregoing embodiment, preferably, the determining whether a breakpoint exists in the target catenary according to the logical combination value specifically includes:
and if the logic combination value is 5, judging that a breakpoint exists in an uplink feeder line of the target contact network.
As can be seen from the above table, when the calculation result is 5, it can be considered that there is an uplink fault.
On the basis of the above embodiment, preferably, the current of the downlink breaker, the current of the uplink breaker, and the current of the circuit breaker in the partition are 1 or 0, and are specifically determined by the following method:
if the current of the downlink circuit breaker is smaller than a preset current threshold value, setting the current of the downlink circuit breaker to be 0, otherwise, setting the current of the downlink circuit breaker to be 1;
if the current of the uplink breaker is smaller than the preset current threshold, setting the current of the uplink breaker to be 0, otherwise, setting the current of the uplink breaker to be 1;
and if the current of the circuit breaker in the subarea is smaller than the preset current threshold value, setting the current of the circuit breaker in the subarea to be 0, otherwise, setting the current of the circuit breaker in the subarea to be 1.
Specifically, a preset current threshold value can be set, the earth leakage current when the overhead line system is in no-load is avoided, the current of the overhead line system is generally dozens of amperes in no-load, and the value of the preset current threshold value Imin can be taken within the range of 25-30A to ensure reliability.
Judging whether the current of the circuit breaker exists or not according to the preset current threshold, specifically, if the current of the downlink circuit breaker is smaller than the preset current threshold, determining that the current does not exist in the downlink circuit breaker, and setting the current of the downlink circuit breaker to be 0; otherwise, if the current exists in the downlink circuit breaker, the current of the downlink circuit breaker is set to be 1.
The principle of the current setting in the uplink circuit breaker and the current setting of the circuit breaker in the subarea are the same as the principle.
In summary, the embodiment of the present invention provides a method for diagnosing a breakpoint of a main power supply loop of a contact network, which includes obtaining a current value of an uplink feeder line, a current value of a downlink feeder line, a voltage value, and the like, presetting a preset current threshold and a preset voltage threshold in a system during normal operation in advance, and comparing the preset current threshold and the preset voltage threshold with a real-time remote measurement value, so as to determine whether a current voltage of a target contact network during operation is abnormal, thereby determining a breakpoint of the main power supply loop of the contact network, so as to find an abnormal condition in the power supply loop in time and find a hidden danger in advance.
In the rail transit comprehensive monitoring system, after an operator clicks a target overhead line system inspection button, position signals and currents of an uplink breaker, a downlink breaker and a standby breaker of a substation of all power supply arms in a responsibility area are subjected to overall program design; and checking and judging the position signals, current and voltage information of the circuit breakers in the subareas. When a certain breaker of the substation breaks away from the substation and a standby breaker is switched in, the mode can be automatically identified and changed into a mode, and the position signal and the current of the standby breaker are used for judgment and comparison, wherein the specific judgment method comprises the following steps:
fig. 11 is a flowchart of a method for diagnosing a breakpoint of a power supply main loop of a contact network in an embodiment of the present invention, and as shown in fig. 11, a current of an uplink feeder line of a substation, a current of a downlink feeder line, and a current of a subarea substation are obtained, and values of the currents are compared with a current threshold Imin, and if the value is smaller than the current threshold Imin, the value is recorded as 0, and if the value is larger than the current threshold Imin, the value is recorded as 1. And then, sequencing the recorded three values according to the high and low bits of the downlink feeder current, the uplink feeder current and the partition current, and calculating a result value by decimal conversion of the three values. And finally, judging whether the overhead line system is abnormally disconnected or not according to different values of value and the analysis of the tables 1 and 2, and giving an alarm if the overhead line system is abnormal.
The program function is mainly divided into two modules: the switch on-off judging module and the current analyzing module.
And the switch closing position judgment module is used for judging the closing position of the uplink circuit breaker, the downlink circuit breaker and the circuit breaker of the subarea substation of each power supply arm substation after the process is started. The switch of the uplink breaker of the substation needs to be in the closed position, and when the main breaker is abnormal, the spare switch breaker is in the closed position. The switch of the down circuit breaker of the substation is also closed, and when the main circuit breaker is abnormal, the standby circuit breaker is closed. The circuit breakers of the subareas need to be closed. Only when the three switches are closed at the same time, the subsequent judgment can be continued.
The specific process of the current analysis module is as follows: when the required switches are all closed, the uplink and downlink currents of the substation and the currents of the subareas are checked, and when the current value is smaller than Imin, the current value is recorded as 0, and when the current value is larger than Imin, the current value is recorded as 1. And sequencing the recorded three values according to the high and low bits of the downlink feeder current, the uplink feeder current and the partition current, converting binary numbers formed by the three values into decimal numbers, and marking as value. When the value is 0, whether the contact network is broken or not cannot be judged; when the value is 2, 4 or 6, judging that the contact network has a broken line, but judging whether the contact network does not go up or down; when the value is 3, judging that the contact net is disconnected in the descending process; when the value is 5, judging that the overhead line system has broken lines; and when the value is 7, checking a real-time value of the voltage of the subarea, comparing the real-time value with the Umin, if the real-time value is less than the Umin, judging that the uplink or downlink contact net has a broken line, and if the real-time value is more than the Umin, judging whether the broken line exists. And when the line is broken, alarming and prompting are carried out.
Fig. 12 is a schematic structural diagram of a contact network power supply main loop breakpoint diagnosis system provided in an embodiment of the present invention, and as shown in fig. 12, the system includes: a measurement module 1201 and a diagnostic module 1202. Wherein:
the measurement module 1201 is configured to obtain a current of an uplink breaker, a current of a downlink breaker, and a current of a substation breaker in a target catenary, where the target catenary includes an uplink feeder and a downlink feeder, a traction substation is located at one end of the target catenary, a substation is located at the other end of the target catenary, the traction substation is connected to the uplink feeder through the uplink breaker, the traction substation is connected to the downlink feeder through the downlink breaker, the substation is connected to the uplink feeder and the downlink feeder through the substation breaker, and the uplink breaker, the downlink breaker, and the substation breaker are all in an on-position;
the diagnosis module 1202 is configured to determine whether a breakpoint exists in the target catenary according to the current of the uplink breaker, the current of the downlink breaker, and the current of the circuit breaker in the zone.
The device embodiment provided in the embodiments of the present invention is for implementing the above method embodiments, and for details of the process and the details, reference is made to the above method embodiments, which are not described herein again.
Fig. 13 is a schematic entity structure diagram of an electronic device according to an embodiment of the present invention, and as shown in fig. 13, the electronic device may include: a processor (processor)1301, a communication Interface (Communications Interface)1302, a memory (memory)1303, and a bus 1304, wherein the processor 1301, the communication Interface 1302, and the memory 1303 complete communication with each other via the bus 1304. The communication interface 1302 may be used for information transfer of an electronic device. Processor 1301 may invoke logic instructions in memory 1303 to perform a method comprising:
the method comprises the steps that the current of an uplink breaker, the current of a downlink breaker and the current of a subarea substation breaker in a target contact network are obtained, wherein the target contact network comprises an uplink feeder line and a downlink feeder line, a traction substation is located at one end of the target contact network, the subarea substation is located at the other end of the target contact network, the traction substation is connected with the uplink feeder line through the uplink breaker, the traction substation is connected with the downlink feeder line through the downlink breaker, the subarea substation is connected with the uplink feeder line and the downlink feeder line through the subarea substation breaker, and the uplink breaker, the downlink breaker and the subarea substation breaker are all in an on-position;
and judging whether a breakpoint exists in the target contact network or not according to the current of the uplink breaker, the current of the downlink breaker and the current of the circuit breaker in the subarea.
In addition, the logic instructions in the memory 1303 may be implemented in the form of software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the above-described method embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In another aspect, an embodiment of the present invention further provides a non-transitory computer-readable storage medium, on which a computer program is stored, where the computer program is implemented to perform the transmission method provided in the foregoing embodiments when executed by a processor, and for example, the method includes:
the method comprises the steps that the current of an uplink breaker, the current of a downlink breaker and the current of a subarea substation breaker in a target contact network are obtained, wherein the target contact network comprises an uplink feeder line and a downlink feeder line, a traction substation is located at one end of the target contact network, the subarea substation is located at the other end of the target contact network, the traction substation is connected with the uplink feeder line through the uplink breaker, the traction substation is connected with the downlink feeder line through the downlink breaker, the subarea substation is connected with the uplink feeder line and the downlink feeder line through the subarea substation breaker, and the uplink breaker, the downlink breaker and the subarea substation breaker are all in an on-position;
and judging whether a breakpoint exists in the target contact network or not according to the current of the uplink breaker, the current of the downlink breaker and the current of the circuit breaker in the subarea.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A contact network power supply main loop breakpoint diagnosis method is characterized by comprising the following steps:
the method comprises the steps that the current of an uplink breaker, the current of a downlink breaker and the current of a subarea substation breaker in a target contact network are obtained, wherein the target contact network comprises an uplink feeder line and a downlink feeder line, a traction substation is located at one end of the target contact network, the subarea substation is located at the other end of the target contact network, the traction substation is connected with the uplink feeder line through the uplink breaker, the traction substation is connected with the downlink feeder line through the downlink breaker, the subarea substation is connected with the uplink feeder line and the downlink feeder line through the subarea substation breaker, and the uplink breaker, the downlink breaker and the subarea substation breaker are all in an on-position;
and judging whether a breakpoint exists in the target contact network or not according to the current of the uplink breaker, the current of the downlink breaker and the current of the circuit breaker in the subarea.
2. The method for diagnosing the breakpoint of the power supply main loop of the overhead line system according to claim 1, wherein the determining whether the breakpoint exists in the target overhead line system according to the current of the uplink breaker, the current of the downlink breaker, and the current of the circuit breaker in the sub-zone specifically includes:
acquiring a logic combination value of the target overhead contact system, wherein the logic combination value is a decimal value corresponding to a target binary system, the target binary system is formed by sequentially combining the current of the downlink circuit breaker, the current of the uplink circuit breaker and the current of the circuit breaker in the subarea according to a sequence from a high position to a low position, and the current of the downlink circuit breaker, the current of the uplink circuit breaker and the current of the circuit breaker in the subarea are 1 or 0;
and if the logic combination value is an abnormal value all the time within a preset delay time period, determining whether a breakpoint exists in the target contact network or not according to the logic combination value.
3. The method for diagnosing the breakpoint of the power supply main loop of the overhead line system according to claim 2, wherein the determining whether the breakpoint exists in the target overhead line system according to the logic combination value specifically includes:
and if the logic combination value is one of 2, 4 and 6, judging that a breakpoint exists in the target overhead contact system but the uplink and the downlink cannot be distinguished.
4. The method for diagnosing the breakpoint of the power supply main loop of the overhead line system according to claim 2, wherein the determining whether the breakpoint exists in the target overhead line system according to the logic combination value specifically includes:
and if the logic combination value is 7 and the voltage of the partition is lower than a preset voltage threshold, judging that a breakpoint exists in the target overhead contact system.
5. The method for diagnosing the breakpoint of the power supply main loop of the overhead line system according to claim 2, wherein the determining whether the breakpoint exists in the target overhead line system according to the logic combination value specifically includes:
and if the logic combination value is 3, judging that a breakpoint exists in a downlink feeder line of the target contact network.
6. The method for diagnosing the breakpoint of the power supply main loop of the overhead line system according to claim 2, wherein the determining whether the breakpoint exists in the target overhead line system according to the logic combination value specifically includes:
and if the logic combination value is 5, judging that a breakpoint exists in an uplink feeder line of the target contact network.
7. The method for diagnosing the disconnection point of the main power supply loop of the overhead line system according to claim 2, wherein the current of the downlink circuit breaker, the current of the uplink circuit breaker and the current of the circuit breaker in the subarea are 1 or 0, and are specifically determined in the following manner:
if the current of the downlink circuit breaker is smaller than a preset current threshold value, setting the current of the downlink circuit breaker to be 0, otherwise, setting the current of the downlink circuit breaker to be 1;
if the current of the uplink breaker is smaller than the preset current threshold, setting the current of the uplink breaker to be 0, otherwise, setting the current of the uplink breaker to be 1;
and if the current of the circuit breaker in the subarea is smaller than the preset current threshold value, setting the current of the circuit breaker in the subarea to be 0, otherwise, setting the current of the circuit breaker in the subarea to be 1.
8. The utility model provides a contact net power supply dominant loop breakpoint diagnostic, its characterized in that includes:
the measurement module is used for acquiring current of an uplink breaker, current of a downlink breaker and current of a substation breaker in a target contact network, wherein the target contact network comprises an uplink feeder line and a downlink feeder line, a traction substation is located at one end of the target contact network, a substation is located at the other end of the target contact network, the traction substation is connected with the uplink feeder line through the uplink breaker, the traction substation is connected with the downlink feeder line through the downlink breaker line, the substation is respectively connected with the uplink feeder line and the downlink feeder line through the substation breaker, and the uplink breaker, the downlink breaker and the substation breaker are all in a closed position;
and the diagnosis module is used for judging whether a breakpoint exists in the target contact network or not according to the current of the uplink breaker, the current of the downlink breaker and the current of the circuit breaker in the subarea.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the steps of the method for diagnosing a breakpoint of a power supply main circuit of an overhead contact system according to any one of claims 1 to 7 when executing the program.
10. A non-transitory computer-readable storage medium, on which a computer program is stored, wherein the computer program, when being executed by a processor, implements the steps of the method for diagnosing a breakpoint of a catenary power supply main circuit according to any one of claims 1 to 7.
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