JP2932440B2 - Accident point classification device for distribution lines - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an accident point classification device that detects an accident point in a distribution line and separates the accident section from a healthy section.

[Prior Art] FIG. 5 shows a conventional fault point sorting apparatus, which includes a section switch for dividing a distribution feeder into a plurality of distribution sections, and a junction point switch inserted between the distribution feeders. It consists distribution system in which opening and closing of the or point of attachment classification is performed by, a is distribution substation, B and feeder C is that is interlocking through the breaker B ₁ and C ₁ to substation bank, B _{11
· B 12 · B 13 · B} 14 · B 15 · C 11 · C 12 · C 13 · C 14 and C ₁₅
Is a power distribution section of each of the hoods B and C. B ₂₁・ B ₂₂・ B
₂₃・ B ₂₄・ C ₂₁・ C ₂₂・ C ₂₃ and C ₂₄ are normally closed circuit switches in each distribution section, B ₂₁₁・ B ₂₂₁・ B ₂₃₁・ B
₂₄₁・ C ₂₁₁・ C ₂₂₁・ C ₂₃₁ and C ₂₄₁ are timed accident detectors, B ₂₁₂・ B ₂₂₂・ B ₂₃₂・ B ₂₄₂・ C ₂₁₂・ C ₂₂₂・ C ₂₃₂ and
C ₂₄₂ is a remote control station, D ₂₁ is a normally open connection point switch inserted at the connection point between the distribution section B ₁₄ and the distribution section of another distribution feeder (not shown), and D ₂₁₁ and D ₂₂₁ are timed accident investigation unit, D ₂₁₂ · D ₂₂₂ is Toseiko station, E is a far-system master station.

When [invention will An object to be solved] ground fault now distribution leg C ₁₃ occurs, the circuit breaker C ₁ is open, sectionalizing switch C ₂₁ · C ₂₂ · C ₂₃ and C ₂₄ are open,
Distribution leg C ₁₁ · C ₁₂ · C ₁₃ and C ₁₄ is a power failure. After a certain time, the circuit breaker C ₁ is turned on again, when voltage application to the distribution leg C _11, sectionalizing switch C ₂₁ is turned after turning waiting time limit by timed accident investigation unit C _211, the section switch C ₂₁ Power distribution section C by input
₁₂ electricity is charged.

Next, timed accident investigation unit was connected to a section switch C ₂₂ C
₂₂ section switch C ₂₂ is turned by operating the same way. Therefore the sectionalizing switch downstream of the distribution zone C ₁₃ has caused a ground fault, timed accident investigation unit was connected to a section switch C ₂₂ C
Locking the closing of ₂₂₁ and circuit breaker C ₁ open,
Section switch C ₂₁ · C ₂₂ · C ₂₃ and C ₂₄ is open, the distribution leg
C ₁₁ · C ₁₂ · C ₁₃ and C ₁₄ is a power failure. Accordingly, the timed accident detector C connected to this reopened sectional switchgear
Toseiko station C ₂₂₂ in _221, then transmitted to the far-system master station E, far system master station locks the insertion of section switch C ₂₃ downstream of section switch C _22, the substation after a predetermined time with breaker C ₁ is the power the retrocession introduced has been distribution leg C ₁₁ · C ₁₂ to voltage application to healthy section, the inserted coupling point switches D between the distribution section (not shown) and distribution zone C _{14 22} to power the downstream side of the distribution leg C ₁₄ · C ₁₅ closed path to sectionalizing switch C _23. In this way, the segmented switches are sequentially re-input and re-input, and the faulty section is detected while investigating the faulty section of the distribution line.Therefore, it takes a lot of time to return, and large areas have a long blackout. Was.

According to the present invention, an accident section is specified and separated from a healthy section without causing a blackout in all sections.

[Means for Solving the Problems] The present invention provides a distribution switch that divides a distribution feeder into a plurality of distribution sections, a remote control master station that receives a detection signal of a ground fault relay provided in the distribution hood, Zero-phase detection means for detecting a zero-phase current and a zero-phase voltage of a distribution line in each distribution section, signal processing means for determining a ground fault direction from the zero-phase current and the zero-phase voltage of the distribution line, and signals of the signal processing means Loop current detecting means for detecting a ground fault section, and when the zero-phase current and the zero-phase voltage flowing in the distribution line are larger than the set zero-phase current and the zero-phase voltage, the direction of the ground fault is detected. Output from the signal processing means to the loop current detection means,
As described above, a section switch is circuited by a detection signal that detects a loop current flowing between the loop current detection means and an upstream or downstream loop current detection means and a signal from a remote control station that receives a ground fault signal. It was done.

[Examples] Hereinafter, the present invention will be specifically described based on examples shown in the drawings.

1 is a distribution system diagram, FIG. 2 is a fault section detection device in the distribution system diagram of FIG. 1, FIG. 3 is a loop current detection circuit of the fault section detection device of FIG. 2, and FIG. It is a gas switch provided with detection means.

In FIG. 1, the same portions as those in FIG. 5 are denoted by the same reference numerals, and description thereof will be omitted.

_{B 31 · B 32 · B 33} · B 34 · C 31 · C 32 · C 33 · C 34 · D 31 and D ₃₂ is a segment detection device, the zero-phase formed in the gas switchgear as shown in FIG. 2 Signal processing means C ₃₁₁・ C ₃₂₁・ C ₃₃₁・ C for processing the zero-phase voltage / zero-phase current detected by the detection means
_A loop current flowing between the ₃₄₁ and the upstream or downstream section detection device (the loop current is a communication line C41 connected via SW1 and SW2 of the loop current detection device C323, C323, and C333 in FIG. 3). Refers to the current flowing through C42, where SW1, SW2
Are ground fault detecting means and signal processing devices C311, C321, C3 in FIG.
According to the detection result constituted by 31, when the ground fault direction is on the downstream side, SW1 and SW2 are closed, and when the ground fault direction is on the upstream side, SW1 and SW2 are opened. )
Loop current detecting means C ₃₁₃ , C ₃₂₃ , C ₃₃₃ , C ₃₄₃ for detecting the presence or absence of a ground fault in the distribution section, and control means C ₃₁₂ , C ₃₂₂ for controlling the signal processing means and the loop current detecting means _.・
It consists of C ₃₃₂ and C ₃₄₂ . Loop current detection means
As shown in FIG. 3, C ₃₁₃ , C ₃₂₃ , C ₃₃₃ and C ₃₄₃ are switches SW ₁ and SW ₂ that close when the flow direction of the ground fault current is on the upstream side and open when the flow direction of the ground fault current is on the downstream side. the detection unit i ₁ · i ₂ and e ₁ · e ₂ and the power t for detecting a current and a voltage are provided. B ₄₁ , B ₄₂ , B ₄₃ , B ₄₄ , C ₄₁ , C ₄₂ , C ₄₃ and C ₄₄ are signal lines, B ₅ and C ₅ are communication lines, 1 is an optical transmitter, 2, 3 is an optical fiber, 4 Is an optical receiver, 5 is a signal processing circuit, 6 is a transmission circuit, 7 is a gas switch, 7a, 7b, 7c are open / close electrodes, 8, 9,
Numeral 10 is a zero-phase detecting means, which is provided with annular cores 8a, 9a, and 10a arranged so as to surround the switching electrodes 7a, 7b, and 7c, and the transformers are equalized to these annular cores 8a, 9a, and 10a, respectively. As secondary windings 8b, 9b, 10b and tertiary windings 8c, 9c, 10c
Is wound. 11 is a load resistance connected in parallel to the secondary windings 8b, 9b, 10b, and 12 is an optical sensor
c, 9c and 10c are connected in series, and both ends are connected to the electrodes of the optical sensor. 13 is a communication line, and 14 is an operation line.

Next, the operation will be described. When the power distribution section is normally energized, the secondary windings 8b, 9b of the transformers 8, 9, 10 provided around the switching electrodes 7a, 7b, 7c of the gas switch. , 10b
, The sum of the secondary currents induced in the tertiary windings becomes equal, no voltage is generated in the tertiary windings 8c, 9c, and 10c. Since the zero-phase current does not flow in each section detecting device, the detection is further repeated. Further, since a zero-phase voltage detector (not shown) provided on the switching electrode has not detected the zero-phase voltage, the detection is further repeated.

Now, when the one-phase distribution leg C ₁₃ is ground, the ground絡継Electric F detects a ground fault which is provided in the substation A, and sends the far system master station E, the far-system master station communication lines B ₅ · transmits the earth fault detection signal distribution line in C _5, the zero-phase current flows in the closing electrode 7a of the gas switchgear 7, the secondary winding 8b of the zero-phase detector 8 provided in the opening and closing electrodes 7a Secondary voltage and secondary current are induced,
The same secondary voltage is applied to each of the other secondary windings 9b and 10b, and the tertiary windings 8c, 9c, 10
c, a detection voltage is induced, and the optical receiver 12
Transmitting through the communication line 13 from the transmitting circuit 6 via the signal processing circuit 5 to zero-phase current I ₀₁ in period detector _{C 31 · C 32 · C 33} · C 34. In addition, a zero-phase voltage detector (not shown) provided on the switching electrode detects the zero-phase voltage _V01 , and the section detectors _C31 and _C32
・ Send to C ₃₃ and C ₃₄ . Section detector C ₃₁・ C ₃₂・ C ₃₃・ C
_{The 34} signal processing means C ₃₁₁ , C ₃₂₁ , C _331, and C ₃₄₁ have the set zero-phase voltage V ₀ , zero-phase current I _0, and the zero-phase voltage V ₀₁ just detected.
- zero-phase current to determine whether I ₀₁ is large, when a large zero-phase voltage V _01, zero-phase current I ₀₁ detected the segment detection device C
The signal processing means C ₃₁₁ and C ₃₂₁ of C ₃₁ and C ₃₂ perform phase judgment from the zero-sequence voltage V ₀₁ and the zero-sequence current I ₀₁ to detect the direction of the ground fault. Detection means
The switches SW ₁ and SW ₂ of C ₃₁₃ and C ₃₂₃ are closed, and the signal processing means C ₃₃₁ and C ₃₄₁ of the section detecting devices C ₃₃ and C ₃₄ are connected to the loop current detecting means C ₃₃₃ because the ground fault is on the upstream side. And the switches SW ₁ and SW ₂ of C ₃₄₃ are opened.

Thus, between the loop current detection means C ₃₁₃ and loop current detection means C _323, the power t of the loop current detector C ₃₁₃
・ Switch SW ₂・ Current detector i ₂・ Signal line C ₄₁・ Current detector i ₁ of loop current detector C ₃₂₃・ Switch SW ₁・ Power supply t ・
Loop current does not flow through the circuit of the signal line C _41, the control unit C in which only the voltage is detected in the voltage detecting section e ₁ of the voltage detector e ₂ and the loop current detector C ₃₂₃ of the loop current detector C ₃₁₃
Sent to ₃₁₂ · C _322, detects that the ground fault has not occurred in the power distribution segment C _12.

Next, a switch SW of the loop current detecting means C ₃₂₃ is provided between the loop current detecting means C ₃₂₃ and the loop current detecting means C _333.
2 and current detecting section i ₂ · signal line C _42-loop current detector C ₃₂₃
A loop current flows from the current detection unit i ₁ , the current detection unit e _1, and the signal line C ₄₂ to the circuit of the power supply t of the loop current detection unit C ₃₂₃ ,
Current detector i ₂ and voltage detector e _{2 of} loop current detector C ₃₂₃
The current detector i ₁ and the voltage detector e _{1 of the} loop current detector C ₃₃₃ detect the zero-sequence current and the zero-sequence voltage, respectively, and the loop current detectors C ₃₂₃ and C ₃₃₃ detect the zero-sequence current and the zero-sequence voltage. by the earth fault detection signal from the signal and the far system master station E, section switches C ₂₂ · respectively controller circuit signals C ₂₃ C ₃₃₂ ·
C ₃₃₃ and the respective control means C ₃₃₂ and C ₃₃₃ are operating lines
14 to open the respective section switches C ₂₂ · C ₂₃ through,
Healthy power distribution section C ₁₃ an accident has occurred distribution leg C ₁₁ ·
Separating partition from _{C 12 · C 14 · C 15} ·.

[Effect of the Invention] Since the present invention is configured as described above, it is possible to quickly separate and open only an accident section from a healthy section without causing a power failure in the entire section, and to minimize the power failure section. As well as being able to do so, it is possible to eliminate the power outage time in the healthy section.

[Brief description of the drawings]

1 is a power distribution system diagram showing an embodiment of the present invention, FIG. 2 is a fault section detection device in the power distribution system diagram of FIG. 1, FIG. 3 is a loop current detection circuit of the fault section detection device of FIG. 4th
The figure shows a gas switch provided with zero-phase detecting means, and FIG. 5 shows a conventional power distribution system. 8,9,10 ...... zero-phase _{detector, B 31 · B 32 · B} 33 · B 34 · C
₃₁・ C ₃₂・ C ₃₃・ C ₃₄・ D ₃₁・ D ₃₂ …… Section detector, C ₃₁₁
· C ₃₂₁ · C ₃₃₁ · C ₃₄₁ ····· Signal processing means, C ₃₁₃ · C ₃₂₃ · C
₃₃₃・ C ₃₄₃ …… Loop current detection means, C ₃₁₂・ C ₃₂₂・ C ₃₃₂
・ C ₃₄₂ ...... Control means, B ₄₁・ B ₄₂・ B ₄₃・ B ₄₄・ C ₄₁・ C ₄₂・
C ₄₃ / C ₄₄ …… Signal line, B ₅・ C ₅ …… Communication line

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H02J 13/00 H02H 3/32-3/52

Claims (1)

(57) [Claims] 1. A distribution switch for dividing a distribution feeder into a plurality of distribution sections, a remote control master station provided in a distribution feeder for receiving a detection signal of a ground fault relay, and a zero of a distribution line in each distribution section. Zero-phase detecting means for detecting a phase current and a zero-phase voltage,
A signal processing means for determining a ground fault direction from the zero-phase current and the zero-phase voltage of the distribution line, and a loop current detection means for detecting a ground fault section based on a signal from the signal processing means; The direction of the ground fault is detected from the zero-sequence voltage and output from the processing means to the loop current detection means,
The section switch is opened by a detection signal that detects a loop current flowing between the loop current detection means and the upstream or downstream loop current detection means and a signal from the remote control master station that receives the ground fault signal. An accident point classification device for distribution lines characterized by the following.