CN201887445U - One-phase earth fault isolation system for distribution network - Google Patents
One-phase earth fault isolation system for distribution network Download PDFInfo
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- CN201887445U CN201887445U CN2010205967723U CN201020596772U CN201887445U CN 201887445 U CN201887445 U CN 201887445U CN 2010205967723 U CN2010205967723 U CN 2010205967723U CN 201020596772 U CN201020596772 U CN 201020596772U CN 201887445 U CN201887445 U CN 201887445U
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- automatic switch
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- overhead transmission
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Abstract
The utility model discloses a one-phase earth fault isolation system for a distribution network, and the one-phase earth fault processing procedure is completed through relying on the mutual cooperation of an automatic switch PVS, a remote terminal unit RTU, and a zero sequence potential transformer PT in the system. The remote terminal unit RTU controls the closing and opening of the automatic switch PVS according to the voltage type time sequence protection principle; no circuit zero sequence voltage detected within a first confirmation time before the closing of the automatic switch PVS indicates no fault in the power supply side circuit; and a circuit zero sequence voltage being detected within a second confirmation time after the closing of the automatic switch PVS indicates the one-phase earth fault on the load side of the automatic switch PVS, and the remote terminal unit RTU controls the automatic switch to open and lock out, so as to isolate the one-phase earth fault zone.
Description
Technical field
The utility model relates to a kind of one-phase earthing failure in electric distribution network shielding system.
Background technology
Show according to the power department statistics, about user more than 80% has a power failure because distribution network failure causes, existing 10KV power distribution network has characteristics such as complex structure, branch is numerous, distributed areas are wide, as when single phase ground fault takes place, must rely on the line selection apparatus of transformer station or operation staff's working experience to choose and isolate the whole piece circuit, manually carry out piecemeal investigation and isolated fault section then, obviously the method can shine large-area power-cuts completely, can not isolate the faulty section of this circuit rapidly, equally also waste a large amount of manpower and materials.
The utility model content
Technical problem to be solved in the utility model is to overcome the deficiencies in the prior art, a kind of one-phase earthing failure in electric distribution network shielding system is provided, this system can isolate the faulty section of circuit generation single phase ground fault under the prerequisite of route selection success, and the power supply that recovers non-faulty section.
The utility model discloses a kind of one-phase earthing failure in electric distribution network shielding system, the technical scheme that is adopted is:
This system comprises transformer station and is connected at least one overhead transmission line of described transformer station, be provided with the outlet breaker that is used to isolate described overhead transmission line at the top of described overhead transmission line, be distributed with some automatic switches from the top of described overhead transmission line successively to end, described some automatic switches are separated into different track sections with overhead transmission line; On the circuit of the both sides of each automatic switch, be respectively arranged with zero sequential potential transformer, corresponding each automatic switch all dispose one can with the remote terminal of transformer station's communication, described remote terminal is used to control described automatic switch input and separating brake, and the residual voltage signal conveys of the zero sequential potential transformer of both sides is to remote terminal.
Described system comprises at least two overhead transmission lines, the end of these two overhead transmission lines is connected to form the loop with an interconnection switch, on the circuit of the both sides of described interconnection switch, be respectively arranged with zero sequential potential transformer, to should interconnection switch also disposing a remote terminal that is used to control described interconnection switch input and separating brake, the residual voltage signal conveys of the zero sequential potential transformer of its both sides is to this remote terminal.
The auxiliary winding part of described zero sequential potential transformer also is provided with three-phase power output end, as the working power of described automatic switch and remote terminal except the residual voltage output.
When the track section generation single phase ground fault of overhead transmission line, isolate its faulty section and may further comprise the steps:
A: at first disconnect the outlet breaker of this overhead transmission line, make the equal decompression separating brake of automatic switch on each track section;
B: overlap outlet breaker, each remote terminal electric after successively time-delay drop into corresponding automatic switch and detect automatic switch and whether have residual voltage to produce before and after closing a floodgate; If second acknowledging time behind first acknowledging time before automatic switch closes a floodgate and the combined floodgate does not all detect residual voltage, then continue to drop into next automatic switch; If first acknowledging time before automatic switch closes a floodgate does not detect residual voltage, and second acknowledging time after automatic switch closes a floodgate detects residual voltage, and then single phase ground fault is in the load side of this automatic switch;
C: if detect faulty section in load side, then Dui Ying remote terminal is controlled this automatic switch separating brake and locking, and next automatic switch produces the instantaneous voltage locking and do not drop into, thereby has isolated the single phase ground fault section.
In above-mentioned steps A,, perhaps manually disconnect described outlet breaker by the staff by the described outlet breaker of line selection apparatus automatic disconnection of transformer station
The beneficial effects of the utility model are: the utility model makes line attendant search the fault point very easily, has shortened interruption duration and the working strength that alleviates line attendant greatly.In the process of isolating single phase ground fault, remote terminal only drops into the state of front and back line zero sequence voltage according to each automatic switch, just can determine the position and the locking isolated fault point of single phase ground fault point.The processing of this single phase ground fault and the operational mode of system are irrelevant, have so just guaranteed reliability and practicality that this single phase ground fault is handled.
Description of drawings
Fig. 1 is the system schematic of the utility model embodiment one;
Fig. 2 is the wiring schematic diagram of zero sequential potential transformer in the utility model;
Fig. 3 is the system schematic of the utility model embodiment two;
Fig. 4 is the control flow chart of remote terminal internal processor among the embodiment one;
Fig. 5 is the particular flow sheet of one-phase ground protection program among Fig. 4;
Fig. 6 is the control flow chart of the remote terminal internal processor at interconnection switch place among the embodiment two.
Embodiment
Embodiment one:
As shown in Figure 1, one-phase earthing failure in electric distribution network shielding system in the present embodiment comprises transformer station's (not shown) and is connected in some overhead transmission lines of described transformer station, with circuit one and circuit two is example, be provided with the outlet breaker DL that is used to isolate described overhead transmission line at the top of described overhead transmission line, be distributed with some automatic switch PVS from the top of described overhead transmission line successively to end, described some automatic switch PVS are separated into different track section (as the A among the figure, B, C, D section) with overhead transmission line; On the circuit of the both sides of each automatic switch PVS, be respectively arranged with zero sequential potential transformer PT, corresponding each automatic switch PVS all dispose one can with the remote terminal RTU of transformer station's communication, described remote terminal RTU is used to control input and the separating brake of described automatic switch PVS, and the residual voltage signal conveys of the zero sequential potential transformer PT of both sides is to remote terminal RTU; Single phase ground fault is handled automatic switch PVS, the remote terminal RTU and the cooperatively interacting of zero sequential potential transformer PT that rely in the distribution automation and is finished.
The wiring situation of above-mentioned zero sequential potential transformer PT as shown in Figure 2, it not only detects output single phase ground fault signal, wherein a, the b of auxiliary winding part, c, n end are three-phase power output end, and the working power of automatic switch PVS and remote terminal RTU is provided.Residual voltage of n1, the n2 of zero sequential potential transformer PT end output when single phase ground fault takes place, the earth resistance of its voltage magnitude and single phase ground fault is inversely proportional to, and remote terminal RTU detects this residual voltage as one of declaring of single phase ground fault.
Describe the process of native system isolated fault below in detail with regard to object lesson, each parts is represented with the code name in scheming:
Under normal circumstances, the automatic switch of each waypoint all drops into, all is in normal operating conditions as " circuit one " and " circuit two ".System-wide RTU all can detect residual voltage when single phase ground fault took place, but RTU all is failure to actuate, and kept the original state of switch.The line selection apparatus of transformer station or operations staff select and the isolated fault circuit with working experience, when residual voltage disappears, the route selection success are described.Above said line selection apparatus when handling single phase ground fault, need to collect the parameters such as zero-sequence current of each bar outlet on the same bus, relatively the zero-sequence current size and Orientation of each bar outlet is found out faulty line.And the direction of zero-sequence current depends on system operation mode, and the size of zero-sequence current depends on the earth resistance of single phase ground fault point, and it is worth big I and differs thousands of times, so the route selection success rate of line selection apparatus is not high.
Remote terminal RTU comprises internal processor MPU; the A/D interchanger; be used for the disconnected relay interface that closes of control switch and display module and the MODEM module that is used for transmission signals; it is according to voltage-type sequential protection philosophy; the combined floodgate and the separating brake of control automatic switch; the control flow of its internal processor MPU as shown in Figure 4; promptly first acknowledging time before the combined floodgate of automatic switch does not have the detection line residual voltage in (X time); and second acknowledging time behind the combined floodgate of automatic switch detects the line zero sequence voltage in (Y time); the load side of single phase ground fault at this automatic switch is described; remote terminal RTU control automatic switch separating brake and locking; isolate single phase ground fault point (the unidirectional ground protection program that starts in the Y time-delay process as shown in Figure 5, when the residual voltage that detects load side during with regard to the separating brake automatic switch and with the locking set of load side) greater than set point.For example when the C section generation single phase ground fault of " circuit one ", the line selection apparatus of transformer station or operations staff select " circuit one " outlet breaker DL1 separating brake with working experience, the isolated fault circuit, " circuit one " has a power failure completely, simultaneously the equal decompression separating brake of each automatic switch of " circuit one ".Circuit breaker DL1 starts reclosing, each RTU delay time successively when electric and progressively drop into automatic switch, and check respectively before and after the automatic switch input whether residual voltage is arranged.Before time-delay drops into automatic switch, do not detect residual voltage as RTU2, illustrate that the mains side of automatic switch PVS2 does not have single phase ground fault; RTU2 detects residual voltage after time-delay finishes to drop into automatic switch, illustrate that the load side of automatic switch PVS2 has single phase ground fault, and the RTU2 locking makes automatic switch PVS2 tripping operation isolated fault section in this case; RTU3 then produces the instantaneous voltage locking because of instantaneous input, the separating brake of automatic switch PVS2, and RTU3 locking automatic switch PVS3 does not drop into when its load side power supply, and the C section that breaks down is so just successfully isolated.
Embodiment two:
As shown in Figure 3, system comprises some overhead transmission lines in the present embodiment, at least two overhead transmission lines (circuit one and circuit two) wherein, the end of these two overhead transmission lines is connected to form the loop with an interconnection switch PVS, on the circuit of the both sides of described interconnection switch PVS, be respectively arranged with zero sequential potential transformer PT, to should interconnection switch PVS also disposing a remote terminal RTU who is used to control described interconnection switch input and separating brake, the residual voltage signal conveys of the zero sequential potential transformer PT of its both sides is to this remote terminal RTU, the interconnection switch PVS here is identical with the automatic switch PVS function of each section of circuit, and the staging device on each bar circuit is identical with embodiment one.
Under normal circumstances, except that interconnection switch PVS kept normally open, remaining automatic switch PVS all dropped into, makes " circuit one " and " circuit two " be in normal operating conditions.System-wide RTU all can detect residual voltage when single phase ground fault took place, but RTU all is failure to actuate, and kept the original state of switch.The line selection apparatus of transformer station or operations staff select and the isolated fault circuit with working experience, when residual voltage disappears, the route selection success are described.
As when the C section generation single phase ground fault of " circuit one ", the line selection apparatus of transformer station or operations staff select " circuit one " outlet breaker DL1 separating brake with working experience, the isolated fault circuit, " circuit one " has a power failure completely, simultaneously the equal decompression separating brake of each automatic switch of " circuit one ".Circuit breaker DL1 starts reclosing, each RTU the input automatic switch of delaying time successively when electric, and check respectively before and after the automatic switch input whether residual voltage is arranged, its flow process such as above-mentioned Fig. 4 and shown in Figure 5.Before time-delay drops into automatic switch, do not detect residual voltage as RTU2, illustrate that the mains side of automatic switch PVS2 does not have single phase ground fault; RTU2 detects residual voltage after time-delay finishes to drop into automatic switch, illustrate that the load side of automatic switch PVS2 has single phase ground fault, and the RTU2 locking makes automatic switch PVS2 tripping operation isolated fault section in this case; RTU3 then produces the instantaneous voltage locking because of instantaneous input, the separating brake of automatic switch PVS2, and RTU3 locking automatic switch PVS3 does not drop into when its load side power supply.
Flow chart as Fig. 6, the power failure of " circuit one " makes the remote terminal RTU of control interconnection switch become single-side power from the both sides power supply, it starts long delay and drops into function (the Y long delay after comprising the preceding XL long delay of input and dropping into, principle is with embodiment one), the D section of " circuit one " fails to restore electricity in the long delay process, after then long delay finished, the interconnection switch input was by " circuit two " the D section power supply to " circuit one ".The non-faulty section full recovery power supply and the while of " circuit one " have also been isolated the C section at this moment.
Claims (3)
1. one-phase earthing failure in electric distribution network shielding system, this system comprises transformer station and is connected at least one overhead transmission line of described transformer station, it is characterized in that, be provided with the outlet breaker that is used to isolate described overhead transmission line at the top of described overhead transmission line, be distributed with some automatic switches from the top of described overhead transmission line successively to end, described some automatic switches are separated into different track sections with overhead transmission line; On the circuit of the both sides of each automatic switch, be respectively arranged with zero sequential potential transformer, corresponding each automatic switch all dispose one can with the remote terminal of transformer station's communication, described remote terminal is used to control described automatic switch input and separating brake, and the residual voltage signal conveys of the zero sequential potential transformer of both sides is to remote terminal.
2. one-phase earthing failure in electric distribution network shielding system according to claim 1, it is characterized in that, described system comprises at least two overhead transmission lines, the end of these two overhead transmission lines is connected to form the loop with an interconnection switch, on the circuit of the both sides of described interconnection switch, be respectively arranged with zero sequential potential transformer, to should interconnection switch also disposing a remote terminal that is used to control described interconnection switch input and separating brake, the residual voltage signal conveys of the zero sequential potential transformer of its both sides is to this remote terminal.
3. one-phase earthing failure in electric distribution network shielding system according to claim 1 and 2 is characterized in that the auxiliary winding of described zero sequential potential transformer partly is provided with three-phase power output end, as the working power of described automatic switch and remote terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205967723U CN201887445U (en) | 2010-11-05 | 2010-11-05 | One-phase earth fault isolation system for distribution network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205967723U CN201887445U (en) | 2010-11-05 | 2010-11-05 | One-phase earth fault isolation system for distribution network |
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| Publication Number | Publication Date |
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| CN201887445U true CN201887445U (en) | 2011-06-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010205967723U Expired - Lifetime CN201887445U (en) | 2010-11-05 | 2010-11-05 | One-phase earth fault isolation system for distribution network |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102074938A (en) * | 2010-11-05 | 2011-05-25 | 珠海许继电气有限公司 | Single-phase earth fault isolation system and method for electrical distribution network |
| CN112886548A (en) * | 2020-12-31 | 2021-06-01 | 江苏韬博智能科技有限公司 | Self-adaptive grounding protection device based on zero sequence voltage |
-
2010
- 2010-11-05 CN CN2010205967723U patent/CN201887445U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102074938A (en) * | 2010-11-05 | 2011-05-25 | 珠海许继电气有限公司 | Single-phase earth fault isolation system and method for electrical distribution network |
| CN112886548A (en) * | 2020-12-31 | 2021-06-01 | 江苏韬博智能科技有限公司 | Self-adaptive grounding protection device based on zero sequence voltage |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110629 |