CN114475370B - Short circuit sectional protection method for contact network of cable through power supply system - Google Patents
Short circuit sectional protection method for contact network of cable through power supply system Download PDFInfo
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- CN114475370B CN114475370B CN202210246702.2A CN202210246702A CN114475370B CN 114475370 B CN114475370 B CN 114475370B CN 202210246702 A CN202210246702 A CN 202210246702A CN 114475370 B CN114475370 B CN 114475370B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M3/00—Feeding power to supply lines in contact with collector on vehicles; Arrangements for consuming regenerative power
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M1/00—Power supply lines for contact with collector on vehicle
- B60M1/12—Trolley lines; Accessories therefor
- B60M1/28—Manufacturing or repairing trolley lines
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Abstract
The invention discloses a short-circuit subsection protection method for a contact network of a cable through power supply system, which is characterized in that each traction transformer of the contact network is sectionalized and arranged as a traction station, each traction station comprises a traction transformer, a feeder line current transformer and a feeder line breaker, two adjacent traction stations form a subsection loop, each subsection is provided with a fault component measurement and control unit, the secondary side of the current transformer corresponding to the subsection is connected with the input end of the fault component measurement and control unit, the output end of the fault component measurement and control unit is connected with the control end of the breaker of the traction station, and each fault component measurement and control unit is connected with a dispatching room through a transmission network. The method forms the contact network longitudinal differential current sectional protection by the fault component current instantaneous sampling value, can accurately cut off the contact network fault sectional loop instead of the fault sectional loop to continue to operate, reduces the fault range to the minimum, is not influenced by load current and the distribution capacitance of the contact network, and simultaneously improves the capacity of allowing transition resistance.
Description
Technical Field
The invention belongs to the technical field of electrified railway contact network protection, and particularly relates to a short-circuit sectional protection method for a contact network of a cable through power supply system.
Background
The electrified railway in China is a single-phase power frequency alternating current power supply system, in order to solve the problem of unbalanced three-phase voltage of a power system caused by single-phase power consumption, traction substations of the existing traction power supply system in China all adopt a method for changing a phase sequence, a subarea station can be formed among different power supply arms by the method, electric phase splitting can be caused by the subarea station, various accidents can be caused when a train passes through the electric phase splitting, and therefore the problem that the electric phase splitting is urgently needed to be solved in China is to be cancelled or reduced. The power supply capacity of the cable is stronger than that of an overhead line with the same voltage class, and the distance of a power supply arm is greatly increased, so that the cable through power supply is one of effective methods for reducing the phase of the electric phase in a subarea.
The safety operation of the contact network of the cable through power supply system is a very important link, each section loop of the contact network under the system is supplied with power by the traction transformers on two sides together, and the system is similar to a double-side power supply mode, so that the protection scheme of the system is different from the existing single-side power supply mode, and the system is one of the problems to be solved by the application. And after the overhead line system adopts the sectionalized protection, how to guarantee that the fault is accurately and quickly removed after the fault occurs in a certain overhead line system sectionalized loop, and the overhead line system sectionalized loop circuit breaker which does not have the fault is reliable and does not malfunction, so that the power failure range is reduced to the lowest extent, and the whole overhead line system is not broken down, thereby improving the power supply reliability is another problem to be solved by the application.
Disclosure of Invention
The invention aims to overcome the defects of the existing protection scheme, provides a short-circuit sectional protection method for a contact network of a cable through power supply system, not only provides a short-circuit protection scheme with a bilateral power supply mode, but also can accurately and quickly cut off a faulted contact network sectional loop, and the faulted contact network sectional loop continues to operate, so that the power failure range is reduced to the lowest extent, and the power supply reliability of the contact network is improved.
The technical scheme adopted by the invention is as follows:
a short circuit sectional protection method for a contact network of a cable through power supply system comprises the following steps: the method comprises the steps that a contact net of a cable through power supply system is segmented, the segmentation mode is that each traction transformer of the contact net is segmented and set as a traction station, a segmentation loop is formed between every two adjacent traction stations, each traction station comprises a traction transformer, a first feeder circuit breaker, a second feeder circuit breaker, a first feeder current transformer and a second feeder current transformer, wherein the primary side of each first feeder current transformer and the primary side of each second feeder current transformer are connected with the output of the traction transformer, the secondary side of each first feeder current transformer is connected with the contact net through the first feeder circuit breaker, the secondary side of each second feeder current transformer is connected with the contact net through the second feeder circuit breaker, all feeder circuit breakers are in a normally closed state, and the types and transformation ratios of the feeder current transformers of each traction station are the same;
each segmented loop is provided with a fault component measurement and control unit, and the connection mode of the fault component measurement and control units is as follows: defining any two adjacent traction stations as a first traction station and a second traction station, wherein a branch formed by a second feeder current transformer and a second feeder breaker of the first traction station is adjacent to a branch formed by a first feeder current transformer and a first feeder breaker of the second traction station, and defining two feeder breakers adjacent to the two traction stations in a section as section adjacent feeder breakers, wherein the input of a fault component measurement and control unit is the secondary side of the second feeder current transformer of the first traction station and the secondary side of the first feeder current transformer of the second traction station, and the output of the fault component measurement and control unit is the control end of the section adjacent feeder breaker; each subsection controls the circuit breakers of the subsection adjacent feeder lines of the subsection through a fault component measurement and control unit, and the specific control method comprises the following steps:
the fault component measurement and control unit samples the instantaneous value of the current for N times in a power frequency period, and judges whether S data in the continuous R data meet the following conditions in the obtained current sampling value:
wherein Δ i i1 、Δi (i-1)2 Fault component feeder currents, i, of two branches adjacent to the traction in a segment zd To be constant, to prevent the device from malfunctioning for some reason when the line is empty or dropped, 0<k is less than or equal to 1 and is a braking coefficient;
if yes, the fault component measurement and control unit judges that the short circuit of the contact network occurs in the traction of the corresponding section, at the moment, the fault component measurement and control unit drives the control end of the adjacent feeder circuit breaker of the section to enable the adjacent feeder circuit breaker of the section to be switched off, and otherwise, the adjacent feeder circuit breaker of the section keeps switched on.
Further, the fault component feeder current is extracted by the following formula:
Δi(m)＝i(m)-i(m-N) (2)
in the formula, m is a sampling number, m =1,2,3 …, Δ i (m) is a fault component current sampling value of the mth time, i (m) is a current sampling value of the mth time, i (m-N) is a current sampling value before N sampling points, and N is the sampling frequency of each power frequency period.
The invention has the beneficial effects that:
1. the invention provides a relay protection scheme of a cable through power supply system contact network similar to bilateral power supply.
2. The invention can accurately and quickly cut off the fault sectional loop of the contact network, and the faultless sectional loop breaker of the contact network is reliable and does not malfunction, thereby reducing the power failure range to the lowest and improving the power supply reliability of the contact network.
3. The action characteristic of the invention is not influenced by traction load current and the earth capacitance of a contact network, and theoretically, the action characteristic cannot be influenced as long as the short-circuit point transition resistance is not infinite, so that the capacity of allowing the transition resistance is improved.
Drawings
Fig. 1 is a schematic view of a topology structure of a cable through power supply system according to the present invention.
Fig. 2 is a schematic structural view of a section protection and traction station of the overhead line system.
Fig. 3 is a schematic structural diagram of a fault measurement and control unit according to the present invention.
Fig. 4 is a flowchart illustrating the operation of the present invention.
Detailed Description
The technical scheme of the invention is described in detail below with reference to the accompanying drawings and embodiments:
fig. 2 shows: segmenting at each traction transformer QYB of a contact network and setting the segmented transformer as a traction station QYS, wherein a segmented loop FD is formed between every two adjacent traction stations QYS; the traction station QYS comprises a traction transformer QYB, a feeder circuit breaker QF and a feeder current transformer CT; the feeder breaker QF is normally in a closed state; the CT model and the transformation ratio of the feeder line current transformer of each traction station QYS are the same; traction station QYS i-1 And a draw station QYS i Form a segment FD1, a traction station QYS i And a draw station QYS i+1 Segment FD2 is formed.
Fig. 3 shows a schematic structural diagram of a fault component measurement and control unit CK according to an embodiment of the present invention. Each segmented loop is provided with a fault component measurement and control unit CK and a traction station QYS i-1 The feeder line current transformer CT (i-1)2 Secondary side and draft station QYS i The feeder line current transformer CT i1 Secondary side access fault component measurement and control unit CK 1 The input terminal of (2), a fault component measurement and control unit CK 1 The output end of the same feeder circuit breaker QF (i-1)2 And QF i1 The control ends are connected; traction station QYS i The feeder line current transformer CT i2 Secondary side and traction station QYS i+1 The feeder line current transformer CT (i+1)1 Secondary side access fault component measurement and control unit CK 2 The input terminal of (2), a fault component measurement and control unit CK 2 The output end of the same feeder circuit breaker QF i2 And QF (i+1)1 The control ends are connected; the current transformer is positive in the direction that current flows into the section FD; each fault component measurement and control unit CK is connected with a dispatching room through a transmission network; each fault component measurement and control unit CK samples the instantaneous value of the current for N (N is generally 12) times in one power frequency period.
Fig. 2 also shows an application schematic diagram of each section and traction station of the overhead line system of the cable through power supply system in the embodiment of the invention. Corresponding to FIG. 3, the draft station QYS i-1 The feeder line current transformer CT (i-1)2 Secondary side and draft station QYS i The feeder line current transformer CT i1 Secondary side access fault component measurement and control unit CK 1 An input terminal of (1); traction station QYS i The feeder line current transformer CT i2 Secondary side and draft station QYS i+1 The feeder line current transformer CT (i+1)1 Secondary side access fault component measurement and control unit CK 2 To the input terminal of (1). When the section FD2 has a short-circuit fault of a contact network, see the position shown in the figure, the traction station QYS i The feeder line current transformer CT i2 Secondary side and draft station QYS i+1 The feeder line current transformer CT (i+1)1 The fault component current measured next time has S times of satisfaction
Then the failure component measurement and control unit CK 2 Driving feeder breaker QF i2 And QF (i+1)1 The control end of the section FD2 is switched off, so that the short-circuit fault of the contact network of the section FD2 is cut off, and the feeder circuit breaker QF of the section FD1 without the fault (i-1)2 And QF i1 Not in motion, by the towing post QYS i-1 And QYS i And the power supply operation is continued, and the power failure range is reduced to the lowest.
Fig. 4 illustrates the workflow of the present invention. According to the working principle of the invention: the fault component feeder line current on the left side and the right side of a certain contact net sectional loop meets the requirement of S times in N continuous sampling values of a cycle wave
Therefore, the fault component current sampling value longitudinal differential protection is formed to cut off the short-circuit fault of the contact network. The specific working process is as follows: traction station QYS i-1 The feeder line current transformer CT (i-1)2 Secondary side and draft station QYS i The feeder line current transformer CT i1 The measured fault component current on the secondary side is satisfied S times £ v>
Fault component measurement and control unit CK 1 Decision traction station QYS i-1 And a towing station QYS i The section FD1 between the two modules has a contact net short circuit fault, and a fault component measurement and control unit CK 1 Drive traction station QYS i-1 Breaker QF (i-1)2 And traction station QYS i Breaker QF i1 The control end enables the breaker to be opened, otherwise the breaker QF (i-1)2 And QF i1 Still keeping closing; traction station QYS i The feeder line current transformer CT i2 Secondary side and draft station QYS i+1 The feeder line current transformer CT (i+1)1 The measured fault component current on the secondary side is satisfied S times £ v>
Fault component measurement and control unit CK 2 Determine towing station QYS i And traction station QYS i+1 The section FD2 between the fault component measurement and control units CK has a short-circuit fault of a contact network 2 Drive traction station QYS i Breaker QF i2 And a traction substation QF i+1 Breaker QF (i+1)1 The control end enables the breaker to be opened, otherwise the breaker QF i2 And QF (i+1)1 The closing is still maintained.
And the short circuit and the breaker tripping information are sent to the adjacent dispatching rooms by the fault component measurement and control unit of each section through a transmission network. In order to achieve synchronous sampling of the instantaneous values of the currents at the two ends of the line, GPS technology can be used. The fault component measurement and control unit can judge the fault by means of a microcomputer protection device.
Example (b):
referring to fig. 1, the topology of the cable through power supply system including three traction transformers, i.e. two segmented loops, is divided into 110kV traction cables (power supply cables C) 1 And a return cable C 2 ) 110kV/27.5kV traction transformer and 27.5kV contact net-steel rail. A primary side of a main substation (MSS) is connected with a 220kV power system, and a secondary side output end of the MSS is connected with a 110kV power supply cable and a return cable respectively. The primary side of the traction transformer is connected into a power supply cable and a return cable at a certain distance,and the secondary side is connected with a contact net-steel rail to realize through power supply. The lengths of the left subsection loop and the right subsection loop are 25km and 30km respectively, the left subsection loop locomotive is located at a position 5km away from a No. 1 traction transformer, the right subsection loop locomotive is located at a position 10km away from a No. 2 traction transformer, the locomotives are simulated by a constant power model, P =20MW, and the power factor is 0.98 (lag). And the right subsection loop is in short circuit of a contact net at a distance of 10km from the No. 3 traction transformer in 0.05 s. The left and right contact net subsection loops in fig. 1 correspond to the subsection FD1 and the subsection FD2 in fig. 2, respectively, and the symbol identifications also correspond to those shown in fig. 2. Dividing fault component instantaneous values delta i at the left side and the right side of the section FD1 (i-1)2 、Δi i1 And fault component current instantaneous values delta i on the left and right sides of the segment FD2 i2 、Δi (i+1)1 Sampling for 12 times, R is 6,S is 4,i zd The fixed value is 0.5A, k is 1, the transformation ratio of the current transformer is 1000/1, and the fault component current | delta i of the FD1 is segmented (i-1)2 +Δi i1 |、|Δi (i-1)2 -Δi i1 Fault component current | Δ i of | and segment FD2 i2 +Δi (i+1)1 |、|Δi i2 -Δi (i+1)1 The | are recorded in table 1. The current unit is a.
TABLE 1 Fault component Current recording
| Number of samplings | |Δi (i-1)2 +Δi i1 | | |Δi (i-1)2 -Δi i1 | | |Δi i2 +Δi (i+1)1 | | |Δi i2 -Δi (i+1)1 | |
| 1 | 0.022 | 0.068 | 0.756 | 0.150 |
| 2 | 0.084 | 0.332 | 3.480 | 0.828 |
| 3 | 0.116 | 0.708 | 7.365 | 1.643 |
| 4 | 0.115 | 1.049 | 11.058 | 2.368 |
| 5 | 0.076 | 1.220 | 13.242 | 2.762 |
| 6 | 0.011 | 1.161 | 13.402 | 2.740 |
| 7 | 0.304 | 0.482 | 11.139 | 2.243 |
| 8 | 0.120 | 0.382 | 7.222 | 1.448 |
| 9 | 0.149 | 0.189 | 2.125 | 0.451 |
| 10 | 0.144 | 0.682 | 2.614 | 0.442 |
| 11 | 0.105 | 0.969 | 5.699 | 0.991 |
| 12 | 0.036 | 1.012 | 6.693 | 1.117 |
From the table, it can be seen that the segment FD2 always finds 4 satiations out of 12 samples for 6 consecutive times
Then the failure component measurement and control unit CK 2 Drive traction station QYS i Breaker QF i2 And traction station QF i+1 Breaker QF (i+1)1 The control end enables the control end to open the brake and remove the fault; any sampling point of the sectional FD1 does not meet the requirement
Therefore, the fault component measurement and control unit CK of the non-fault section FD1 1 QF control circuit breaker (i-1)2 And QF i1 And the switch-on state is still kept, and normal operation is continued. The visible failure range is reduced to a minimum. />
Claims (2)
1. A short circuit subsection protection method for a contact network of a cable through power supply system is characterized in that the contact network of the cable through power supply system is sectioned, the sectioning mode is that each traction transformer of the contact network is sectioned and set as a traction station, so that a subsection loop is formed between two adjacent traction stations, each traction station comprises a traction transformer, a first feeder circuit breaker, a second feeder circuit breaker, a first feeder current transformer and a second feeder current transformer, wherein the primary sides of the first feeder current transformer and the second feeder current transformer are connected with the output of the traction transformer, the secondary side of the first feeder current transformer is connected with the contact network through the first feeder circuit breaker, the secondary side of the second feeder current transformer is connected with the contact network through the second feeder circuit breaker, all the feeder circuit breakers are in a normally closed state, and the types and the transformation ratios of the feeder current transformers of each traction station are the same;
each segmented loop is provided with a fault component measurement and control unit, and the connection mode of the fault component measurement and control units is as follows: defining any two adjacent traction places as a first traction place and a second traction place, wherein a branch formed by a second feeder current transformer and a second feeder circuit breaker of the first traction place is adjacent to a branch formed by a first feeder current transformer and a first feeder circuit breaker of the second traction place, defining two feeder circuit breakers adjacent to the two traction places in a section as the adjacent feeder circuit breakers of the section, and then inputting a fault component measurement and control unit into a secondary side of the second feeder current transformer of the first traction place and a secondary side of the first feeder current transformer of the second traction place, and outputting the fault component measurement and control unit as a control end of the adjacent feeder circuit breakers of the section; each subsection controls the circuit breakers of the subsection adjacent feeder lines of the subsection through a fault component measurement and control unit, and the specific control method comprises the following steps:
the fault component measurement and control unit samples the instantaneous value of the current for N times in a power frequency period, and judges whether S data in the continuous R data meet the following conditions in the obtained current sampling value:
wherein Δ i i1 、△i (i-1)2 Fault component feeder currents, i, of two branches adjacent to the traction in a segment zd Is a constant value, 0<k is less than or equal to 1 and is a braking coefficient;
if yes, the fault component measurement and control unit judges that the short circuit of the contact network occurs in the traction of the corresponding section, at the moment, the fault component measurement and control unit drives the control end of the adjacent feeder circuit breaker of the section to enable the adjacent feeder circuit breaker of the section to be switched off, and otherwise, the adjacent feeder circuit breaker of the section keeps switched on.
2. The method for protecting the short circuit section of the contact network of the cable through power supply system according to claim 1, wherein the fault component feeder current is extracted by the following formula:
△i(m)＝i(m)-i(m-N)
in the formula, m is a sampling number, m =1,2,3 …, Δ i (m) is a fault component current sampling value of the mth time, i (m) is a current sampling value of the mth time, i (m-N) is a current sampling value before N sampling points, and N is the sampling frequency of each power frequency period.
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