JPH02219423A - Accident point detector - Google Patents

Abstract

PURPOSE:To minimize the service interruption of a distribution section by detecting zero-phase voltage by means of a zero-phase detection means where the current flows to a distribution line, and by closing a node switch by the detection signal when the detected voltage is higher than the preset value. CONSTITUTION:When one phase in a distribution section E13 is earthed, the zero-phase voltage V0 is transmitted to a control device F32. A signal processing means F321 processes the zero-phase voltage V0 for signal and compares it with a preset value. When the zero-phase voltage V0 is larger in value than the preset value, the detection signal is transmitted to a control means F322. The control means F322 transmits a command signal to put an exciting coil of a node switch F22 to work and connects a distribution block D14 with a distribution block E14 to charge a distribution feeder E where the zero-phase voltage is generated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fault point detection device configured to open and close a connection point switch inserted between a plurality of power distribution feeders.

[Prior Art] Fig. 5 shows a conventional fault point detection device, which includes a division DH switch that divides a distribution feeder into a plurality of distribution sections, a connection point switch inserted between each distribution feeder, and a junction point switch inserted between each distribution feeder. A and B are the transformers of the distribution substation, and C-D and E are the substation bank circuit breakers C1, D, and El. Distribution feeders connected via C0, Ctt, El
3・C14・Ctt・D,・[)+t”[)+a・El
4・Dts・E + +・E,・El3・El4, and E ts are the power distribution sections of each power distribution feeder C, D, and E. C□・C*t-C0・C□・D, 1・D! !・
D, 31D, ・E□・Ett'E■ and El4 are section switches, ctt, which are always in a closed state in each of the above-mentioned distribution sections.
t・Cttt"Ct3t・C141・D□,・DIl-
El31-El4.・E□, ・E□, ・E, l and E
141 is a time-limited accident investigation device, which is connected to the power distribution section via a power transformer 1 to 2 as shown in Figure 6.
The excitation coils 103 and 104 are configured to open and close a section switch or a coupling point switch to be described later. F
tl is a connection point switch that is inserted at the connection point between the distribution section CI4 and the distribution section of another distribution feeder (not shown) and is in a normally open state, and F□ is the distribution section D of the distribution feeder D.
14 and the distribution section E 14 of the distribution feeder E, a connection point switch which is inserted in the connection point and is in a normally open state, F9.
・F.1 is a timed accident investigation device.

[Problems to be Solved by the Present Invention] When a ground fault occurs in the distribution section E13, the circuit breaker E of the substation opens, the sectional switches Et+, Eo, Eo and Es4 open, and the distribution section E++ opens. “Elf・EIs・
C14 and Ets lose power. When the circuit breaker E1 of the substation is disconnected for a certain period of time and turned on again, the time-limited fault investigation device Et11, which is applied to the distribution section E and is connected to the sectional switch E□, is a power transformer! 01 is energized, and after the closing waiting time has elapsed, the section switch Et+ is closed by the energizing coil +03. Section opening/closing W
By turning on E□, the power distribution section E1. In addition to charging electricity to
After detecting the locking operation to lock the closing of the divisional switch when turning on again, the own power distribution section EI! When it is confirmed that there is no accident, the time-limited accident investigation device returns to its normal state. Next is section switch E! The time-limited accident investigation device Ettt connected to 1 operates in the same way as the sectional switch E.

, is input. Distribution section El on the downstream side of this sectional switch
! Due to a ground fault, the substation breaker E
1 opens and closes WE ,,・E□・E.

and E 14 is open, and the distribution section E,・IE+t・E
13/C14 and EIs lose power. The time-limited accident investigation device E1. locks the closing of the section switch E, and transmits it to the remote control master station via a remote control slave station (not shown),
The remote control master station sends a signal to the time-limited accident investigation device Eu5t via a remote control slave station (not shown) so as to lock the closing of the divisional switch E. After a certain period of time, the breaker El of the substation is turned on again and again to apply electricity to the distribution sections E, Elf, and the connection point switch F Detective Ft! A healthy distribution section E on the downstream side of the distribution section E13 where the circuit was closed due to I and an accident occurred.
14・Charge electricity to E +s. In this way, we investigate accidents in power distribution sections by sequentially turning on the sectional switches, and separate the faulty sections from healthy sections.In addition, we close connection point switches in the healthy sections downstream of the faulty sections to prevent accidents. It took a long time to recover from the outbreak, and a wide area was without power for a long time. The present invention aims to minimize power outage time without causing a power outage in a wide area.

[Means for solving the problem] A plurality of distribution feeders, a normally closed section switch that divides each distribution feeder into a plurality of distribution sections, and a normally open connection point inserted between the distribution feeders. switch and
A zero-phase detection means for detecting the zero-phase voltage in the distribution section, and a control device for transmitting a signal to close the coupling point switch based on the detection signal detected by the zero-phase detection means are provided. The system detects the flowing zero-sequence voltage, and when it is greater than a preset value, the detection signal closes the connection point switch, thereby minimizing power outages in the power distribution section.

[Example] Hereinafter, the present invention will be specifically described based on an example shown in the drawings.

Figure 1 is a power distribution system diagram, Figure 2 is a circuit diagram for detecting fault sections in the power distribution system diagram in Figure 1, Figure 3 is an explanatory diagram of the main parts of Figure 2, and Figure 4 is a zero-phase detection means. It is equipped with a gas switch. In FIG. 1, the same parts as in FIG. 5 are given the same reference numerals, and their explanation will be omitted. Cs+ ・Cs*・C5s−
Cs-" Ds+ ・Dst' Dl, ・D, 4・E
s+・Eo・Eo and E14 are section detection devices,
Signal processing means E5,1, E3t+, C33 that processes the ground fault voltage V0 and ground current I0 detected from the distribution line.
Loop current detection means E for detecting the loop current flowing between 1.1 and an upstream or downstream section detection device to determine the presence or absence of a ground fault in the distribution section;・E3! ,・C333
and a control means E for controlling the signal processing means and the loop current detection means, 1.・E.

2.・It is more grooved than Es5t. Loop current detection means E3t s・E3! , ・C33, as shown in Fig. 3, is a switch SW + ・SWt that is closed when the flow direction of the ground current is upstream and open when it is downstream, and a detection device that detects the loop current and voltage. Part 11・i! and el・e, and 7 [! A source t is provided. C41・C
at・C43・C44・C41# D4t
・D 43 ・No. 4 ・E*+”6tx”C4
3 and E 44 are signal lines, F3I-F3 is a control device, and signal processing means F for signal processing the zero-sequence voltage of the distribution line.
5*1, and a control means F that compares the detected zero-sequence voltage with a preset setting value and transmits an exciting coil closing command signal of the coupling point switch when the detected zero-sequence voltage is large.
sex is provided. ■ Optical transmitter, 2.3 is optical fiber, 4 is optical receiver, 5 is signal processing circuit, 6 is transmitting circuit, 7 is gas switch, 7g, 7b, 7c are switching electrodes,
8.9.10 is a zero phase detection means, which includes opening/closing electrodes 7a, 7b,
Annular iron cores 8a19a and IOa are provided surrounding 7c, and these annular iron cores 8a.

Secondary windings 8b, 9b, 10b and tertiary winding 8 are connected to 9a and 10a so that the transformation ratios of the respective transformers are equal.
c19c and IOc are wound.

11 is a burden resistor connected in parallel to the secondary windings 8b, 9b, lOb, I2 is an optical sensor and the tertiary winding 8 c s
9 c s 10 c are connected in series, and both ends thereof are connected to the electrodes of the optical sensor. 13 is a communication line, and I4 is an operation line.

Next, to explain the operation, when power is normally supplied to the power distribution section, the switching electrodes 7a, 7b, and
The sum of the secondary currents induced in each of the secondary windings 8b-9b-10bl of the zero-phase detection means 8-9-10 provided surrounding 7c becomes equal, and the voltage in the tertiary windings 8c and 9clOc becomes equal. No occurrence occurs, and the respective section detection devices and control devices do not operate.

Now, when one phase of the power distribution section E13 has a ground fault and a zero-sequence current flows through the switching electrode 7a of the gas switch 7, this switching electrode 7a
A secondary voltage and a secondary current are induced in the secondary winding of the zero-phase detection means 8 provided in
c・9c・1°C detection voltage is induced, and the zero-sequence voltage v0 and zero-sequence current are generated from the optical sensor I2 through the optical receiver 4, the signal processing circuit 5, and the transmission line 13 from the transmitting circuit 6! . is transmitted to the section detection devices E, 1-E3f-E3ff and C34, and the zero-sequence voltage ■. Control device F3! Send to. Therefore, the signal processing means F01 of the control device processes the zero-sequence voltage V0 and compares it with a preset value to obtain the zero-sequence voltage ■. is large, the detection signal is sent to the control means F3tx. The control means F□ transmits a command signal to turn on the excitation coil of the coupling point switch F□, and connects the distribution section DI4 and the distribution section E14, and applies it to the distribution feeder E where the zero-sequence voltage is generated. Power up. On the other hand, each section detection device E, @ E3*・C33 and E
The signal processing means E311, E, □, C331 and C34 of 34 detect the zero-sequence current ■ from the set zero-sequence current. If zero-sequence current I0 is large, zero-sequence voltage v0/zero-sequence current! . The loop current detection means 31. of the section detection device E31@E3t, which performs phase determination from and detects the ground fault direction, is on the upstream side from the ground fault fault.・EH
3 switches SW1 and SWt are closed, and the loop current detection means E33 of section detection device E and 3 on the downstream side. A signal for opening the switches S'W+ and SWt is sent to the loop current detection means. Loop current detection means E, 13 and 8315
In between, the switch SW of each loop current detection means,
・Since SW is closed, the loop current detection means E31
3 power supply t, switch SW, and current detection section! ,・Current detection unit il of signal line E4 droop current detection means E 3t3
・Switch 5w1-power supply t・Signal line E4. No loop current flows through the circuit, and only the voltage flows through the loop current detection means E□
3 voltage detection section e.

And detected by the voltage detection part e+ of the loop current detection means E3°, the control means E31!・It is transmitted to Eo and detects that no ground fault has occurred in the distribution section Eet. Next, loop current detection means Eats and E.

Between 55 and 55, the switch SW of the loop current detection means Es*3
, ·Sw, are closed, and the switches sw and -sw of the loop current detection means E33° are open, so that the loop current detection means Eats' power supply t, switch SWt, current detection unit i, signal line E4t, Loop current detection means E33. A loop current flows through the circuits of current detection unit i, voltage detection unit e1, and signal line E4*, and each control means E, □, and Eo detects that a ground fault has occurred in this distribution section L13.
, and the respective control means E0.・E, 3! are connected to each section switch E, Cf3 via the operating line 14.
Open the circuit and separate the distribution section from other healthy distribution sections. In the embodiment, zero-phase detection is performed using a light sensor, but the present invention is not limited to this, and detection may be performed electrically.Although a zero-phase detection means is provided in the gas switch, this There is no need to limit it to. Further, although the zero-phase detection means of the sectional switch is provided on both sides of the switching electrode, it may be provided on one side.

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

[Brief explanation of the drawing]

FIG. 1 is a power distribution system diagram showing an embodiment of the present invention, FIG. 2 is a circuit diagram for detecting a fault section in the power distribution system diagram of FIG. 1,
Fig. 3 is an explanatory diagram of the main parts of Fig. 2, Fig. 4 is a gas switch equipped with a zero-phase detection means, Fig. 5 is a conventional power distribution system diagram, and Fig. 6 is a diagram of a conventional power distribution system.
The figure shows a timed fault section detector in the power distribution system of Figure 5. C-D-E is a power distribution feeder, Ct+・C□・C2,・
Cf4・D□・I)*m”[)ts・Dta・E□・E
! t.Eo-Cf4 is a section switch, F and 1.F□ are connection point switches, F31.F□ is a control device, and 8.9.IO is a zero-phase detection means. Figure 2 Eto 3 Figure Figure C 0b

Claims (1)

[Claims] a plurality of power distribution feeders, a normally closed division switch that divides each power distribution feeder into a plurality of power distribution sections, a connecting point switch inserted between the power distribution feeders and a normally open state;
A zero-phase detection means for detecting the zero-sequence voltage in the distribution section, and a control device for transmitting a signal to close the coupling point switch based on the detection signal detected by the zero-phase detection means are provided. A fault point detection device characterized in that a zero-sequence voltage is detected and transmitted to a control device, and when the zero-sequence voltage is higher than a set zero-sequence voltage, a signal is sent from the control device to close a coupling point switch.