JPH0370438A - Partition device for accident point of distribution line - Google Patents

Abstract

PURPOSE:To specify an accident section of a power distribution line without service interruption in all sections, and to eliminate the interruption time of a sound section completely by detecting the accident point and separating and sectionalizing the accident section from the sound section. CONSTITUTION:When zero-phase currents and zero-phase voltage flowing through a distribution line are larger than those set, the direction of the ground is detected and output from signal processing means C311, C321-C341 to loop current detecting means C313, C323-C343, and a section switch is opened by a detecting signal detecting loop currents flowing among the loop current detecting means C313, C323-C343 and loop current detecting means C313, C343 in an upstream or a downstream and a signal from a remote-control master station receiving a ground signal. Accordingly, only an accident section is separated and sectionalized quickly from a sound section without service-interrupting all sections and opened, thus keeping an interruption section within a minimum range while completely eliminating the interruption time of the sound section.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a fault point classification device that detects fault points on power distribution lines and separates fault sections from healthy sections.

[Prior Art] Fig. 5 shows a conventional fault point classification device, which includes a division switch that divides a distribution feeder into a plurality of distribution sections, a connection point switch inserted between each distribution feeder, and a junction switch inserted between each distribution feeder. A is a distribution substation, B and C are feeders connected to the substation bank via circuit breakers B1 and C1, and B is a distribution system in which sections are opened and closed or connection points are opened and closed by
,・Bll・B,・B14・llLa・CIl・C+t
"Cps" CI4 and C+a are the power distribution sections of each fooda B and C. B□・B21B0・13xt
・C0・C0・C0 and C, 4 are section switches that are always closed in each of the above distribution sections, B, 1・B2□・B, □
・B, 41・C0, ・Cm・C2, and C24 are timed accident investigation devices, B212・Bll2・Bz** ' B
□2・C21□・C2□1C2B and C24□ are remote control slave stations, and B21 is a connection point opening/closing that is inserted at the connection point between the distribution section B14 and the distribution section of another power distribution feeder (not shown) and is in a normally open state. Doll/D2□ is a time-limited accident investigation device, B2.2/B222 is a remote control slave station, and E is a remote control master station.

[Problem to be solved by the invention] If a ground fault occurs in the distribution section C0, the circuit breaker C1 will open, and the sectional switches C0, C22, C23 and C24 will open.
is opened, and distribution sections C0, C1□, C4 and CI 1
power outage. After a certain period of time, when the circuit breaker C1 is re-closed and power is applied to the distribution section C0, the sectional switch C0 is closed by the time-limited accident investigation device C2□ after the closing waiting time has elapsed, and by the closing of the sectional switch C□ Power distribution section CI2 is charged with electricity.

Next, the time-limited accident investigation device C221 connected to the sectional switch C22 operates in the same manner to close the sectional switch C2□. Since a ground fault has occurred in the power distribution section C1 downstream of this sectional switch C0, the closing of the time-limited fault investigation device C2□ connected to the sectional switch C0 is locked, and the circuit breaker C1 is opened and the sectional switch C1 is opened. The switches C□・C, *C, and C21 are opened, and the power distribution sections C8・CI2'CI3 and C8 are cut off. Therefore, the remote control station C of the time-limited accident investigation device C7□ connected to this re-opened section switch
t22 transmits to the remote control master station E, the remote control master station locks the closing of the division switch C23 downstream of the division switch C22, and after a certain period of time, the circuit breaker C3 of the substation is closed again and the power is distributed. Power is applied to the sections C0 and CI2 to supply power to the healthy section, and the connection point switch Do inserted between the distribution section C14 and the distribution section (not shown) is closed, and the section switch C2 is closed.
Power is supplied to power distribution sections CI4 and C4 on the downstream side of No.3. In this way, the fault section is detected while investigating the fault section of the power distribution line by sequentially re-turning the sectional switch and turning it on again.
It took a long time for the power to be restored, and a wide area was without power for a long time.

The present invention is designed to identify an accident section and separate it from a healthy section without causing a power outage in the entire section.

[Means for Solving the Problems] The present invention provides a division switch that divides a power distribution feeder into a plurality of power distribution sections, a remote control master station that receives a detection signal of a ground fault relay provided in the power distribution feeder, Zero-sequence detection means for detecting the zero-sequence current and zero-sequence voltage of the distribution line in each distribution section, signal processing means for determining the ground fault direction from the zero-sequence current and zero-sequence voltage of the distribution line, and the signal of the signal processing means Loop current detection means for detecting a ground fault section is provided, and when the zero-sequence current and zero-sequence voltage flowing in the distribution line are larger than the set zero-sequence current and zero-sequence voltage, the direction of the ground fault is detected. A remote control master station receives a detection signal that is output from the signal processing means to the loop current detection means, and detects the loop current flowing between the loop current detection means and the upstream or downstream loop current detection means, and a ground fault signal. The section switch is opened in response to the signal.

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

Fig. 1 is a power 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 in Fig. 2, and Fig. 4 is a zero-sequence current. It is a gas switch equipped with a detection means.

In FIG. 1, the same parts as in FIG. 5 are given the same reference numerals, and their explanation will be omitted.

B,・B,・B33・B34・C31・C82・CSS
・C34・D and 2 are section detection devices, and as shown in FIG. 2, signal processing means C performs signal processing on the zero-sequence voltage and zero-sequence current detected by the zero-sequence detection means provided in the gas switch. □
Loop current detection means C that detects the loop current flowing between 1.C1□.C1□.C141 and an upstream or downstream section detection device to detect the presence or absence of a ground fault in the distribution section.
□,・C32,・C3,3・C84, and control means 0.2・C8 for controlling the signal processing means and loop current detection means
It is composed of °・C332・CS<t. As shown in FIG. 3, the loop current detection means cabs・C82,・Cs51Cs4s is a switch SW,・S that closes when the flow direction of the ground fault current is upstream and opens when the flow direction of the ground fault current is downstream.
W8 and a detection section il/il that detects the loop current and voltage.
I2 and e, @e, and a power supply t are provided.

B4+”Baa”Bas”Baa”Co”Caz”Ca
s and C1 are signal lines, BIC is a communication line, l 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 is a switching electrode, 8.9.10 is a zero-phase detection means, and a ring-shaped iron core 8a is arranged surrounding the switching electrodes 7a17b and 7c.
, 9a, 10a are provided, and these annular cores 8a, 9
Secondary windings 8b, 9b, lOb and tertiary windings 8c, 9 so that the transformation of the transformer is equal to aS 10a, respectively.
c, 10c are wound. 11 is the secondary winding 8b
, 9b and 10b are connected in parallel, and 12 is an optical sensor, the tertiary windings 8c, 9c and 10c are connected in series, and both ends thereof are connected to electrodes of the optical sensor. 13 is a communication line, and 14 is an operation line.

Next, to explain the operation, when the power distribution section is normally energized, the switching electrodes 7a, 7b, 7 of the gas switch
the secondary winding 8b of the transformer 8.9.10 provided surrounding c;
The sum of the secondary currents induced in 9b and 10b becomes equal, and the tertiary winding 8c.

No voltage is generated at 9cS lOc, and since no zero-sequence current is flowing in each section detection device, detection is further repeated. Moreover, since the zero-sequence voltage detection device (not shown) provided on the switching electrode does not detect the zero-sequence voltage, the detection is repeated.

Now, when one phase of the distribution section CI3 has a ground fault, the ground fault relay F installed in the substation A detects the ground fault and sends a signal to the remote control master station E, and the remote control master station connects the communication lines B, -C. , and transmits the ground fault detection signal of the distribution line to the switching electrode 7 of the gas switch 7.
When a zero-sequence current flows through the opening/closing electrode 7a, a secondary voltage and a secondary current are induced in the secondary winding 8b of the zero-phase detection means 8 provided on the opening/closing electrode 7a, and each of the other secondary windings 9b to 10b is The same secondary voltage is applied to the tertiary windings 8c, 9c, and 10c of each zero-phase detection means, and a detection voltage is induced in the tertiary windings 8c, 9c, and 10c of each zero-phase detection means, and is transmitted from the optical sensor 12 through the optical receiver 4 and the signal processing circuit 5 to the transmitting circuit 6. The zero-sequence current IO+ is passed through the communication line 13 to the section detection devices C0, C32, and C3! - Send to C84.

In addition, a zero-sequence voltage detection device (not shown) provided on the opening/closing electrode detects a zero-sequence voltage v0. is detected, and the section detection device C8I/C0
- Send to CSS/C14. Section detection device CS+・C
32HC13/C84 signal processing means Cs+I”Cs,
・C1,1・C541 is the set zero-sequence voltage Vo and zero-sequence current■. And the zero-sequence voltage V just detected. ,・Zero-sequence current 1
01 is large or not, and the detected zero-sequence voltage VO2
- When the zero-sequence current IQ+ is large, the signal processing means C311 and C1□ of the section detection devices C□ and C32 are the zero-sequence voltage ■. 1 and the zero-phase current Io+ to detect the ground fault direction, and since the ground fault is on the downstream side, the switches SW and S of the loop current detection means C33, C3, and S
W, is closed, and the signal processing means C8, of the section detection devices CSS and C3,.

and C14, the ground fault is on the upstream side, so switch SW1 of loop current detection means C333 and C84,
and SW are opened.

Therefore, between the loop current detection means C11 and the loop current detection means C113, the loop current detection means C11
3 power supply t, switch SW, current detection unit 11 signal line C
1. Current detection section i of loop current detection means C32,
No loop current flows through the circuit of switch SW1, power supply t, and signal line C4, and only voltage flows through the loop current detection means C11.
, voltage detection section C2 and loop current detection means C1m1
The control means Csu”C detected by the voltage detection unit el of
□, and it is detected that no ground fault has occurred in the distribution section CI2.

Next, between the loop current detection means C12 and the loop current detection means Cs5s, the switch SW of the loop current detection means C123, the current detection section 12, the signal line C41'' and the current detection section il of the loop current detection means C82 are connected. - A loop current flows from the voltage detecting section e1 and the signal lines C and 2 to the circuit of the power supply t of the loop current detecting means C82, and the current detecting section 12 of the loop current detecting means C1 and the voltage detecting section C2 and the loop current detecting means C18, current detection section il/voltage detection section e
1 detects zero-sequence current and zero-sequence voltage, respectively, and loop current detection means csxs e Cs. uses the zero-sequence current and zero-sequence voltage signals and the ground fault detection signal from the remote control master station E to transmit the circuit signals of the section switches C2ff1 a cxs to the control means C3□ and C833, respectively. cssz ” Cs*s opens the respective sectional switches C0 and CtS via the operation line 14 to replace the faulty distribution section C11 with the healthy distribution section CCU and CtS.
Separate and classify from CI4/C4.

[Effects of the Invention] Since the present invention is configured as described above, it is possible to quickly separate and open only the accident section from the healthy section without causing a power outage in the entire section, thereby minimizing the power outage section. At the same time, it is possible to completely eliminate power outage time in healthy sections.

[Brief explanation of 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, and FIG. 3 is a loop current detection circuit of the fault section detection device of FIG. 2; Fourth
The figure shows a gas switch equipped with zero-phase detection means, and FIG. 5 shows a conventional power distribution system diagram. 8.9.10...Zero phase detection means, B, 1・BS2・B
33・B, 4・C□・C,,e C,,・CS4・D□
・DS2-...Section detection device, C111・C8□・C5
□・C141...Signal processing means, C313・C12,
・C81, ・C34, ... loop current detection means, C3
+2・C5zz' Cs51Csa1...control means,
B□・B42・B43・B44・C41"c4t・C4
3"CI4...'Signal line, B1C1...Communication line diagram

Claims (1)

[Claims] 1. A division switch that divides the distribution feeder into multiple distribution sections, a remote control master station that receives the detection signal of the ground fault relay installed in the distribution feeder, and Zero-phase detection means for detecting zero-sequence voltage, signal processing means for determining the direction of a ground fault from the zero-sequence current and zero-sequence voltage of the distribution line, and loop current detection means for detecting a ground fault section based on the signal of the signal processing means. and when the zero-sequence current and zero-sequence voltage flowing in the distribution line are larger than the set zero-sequence current and zero-sequence voltage, the ground fault direction is detected and output from the signal processing means to the loop current detection means. , the section switch is opened by a detection signal that detects the 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 has received the ground fault signal. A power distribution line fault point classification device characterized by: