JP2857559B2 - Location system for power line accident point section - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power line fault point locating apparatus for locating a section where a power line interphase short-circuit accident has occurred in a substation or the like.

[0002]

2. Description of the Related Art An example of the construction of a generally known substation will be described with reference to FIG. 1 which is a single-line diagram of a power line fault point locating apparatus according to an embodiment of the present invention.

The first line 1L of the transmission line is connected to one end of a circuit breaker 4 via a disconnector 3L in a substation, and the other end of the circuit breaker 4 is connected to a common bus 1, 2 via disconnectors 3X1, 3Y1, respectively. 2L of the transmission line is also connected to the common buses 1 and 2 by the same configuration. Power transmission is performed on any of the transmission lines of such a plurality of lines. For example, with the disconnector 3Y1 closed and the disconnector 3X1 open, the power is transmitted from the common bus 2 via the circuit breaker 4 of the 1st line 1L. Power transmission is taking place. Although not shown in detail, a bus section breaker and a bus tie breaker are connected between the common buses 1 and 2, and each device, for example, the disconnector 3L, the disconnector 4, the disconnector 3X1, and the disconnector The devices 3Y1 are connected by a connection bus so as to correspond to the connection diagram shown. The power lines including the common buses 1 and 2 and the connection buses in the substation having such a configuration are electrically insulated and held by an insulating support 40 such as a support insulator.
A voltage transformer 6 is provided on the power line side of the disconnector 3L and a current transformer 5 is provided on both sides of the circuit breaker 4 in order to locate an interphase short-circuit accident caused by insulation breakdown of the insulating support 40 or the like.
O, 5I are provided, the current transformer 5O monitors the transmission line side more, and the current transformer 5I monitors the common buses 1, 2 side more.

When an inter-phase short-circuit fault has occurred, signals from the voltage transformer 6 and the current transformers 50 and 51 are taken in by the voltage / current input circuit 7 and the bus protection device 8 determines the fault occurrence position based on these input conditions. That is, when it is determined that the bus protection device 8 is an external accident on the transmission line side with respect to the circuit breaker 4, a command is given to the trip circuit 9 to open the circuit breaker 4 to cut off the fault current. The power transmission is restarted immediately after the circuit breaker 4 is closed from the open state. When the bus protection device 8 determines that the internal accident is on the common bus side, the bus tie circuit breaker is changed from the closed state to the open state, and the common bus 1 and the common bus 2 are separated.
Workers visually check the position of the power line in the substation where the phase-to-phase short-circuit accident occurred from the trace of discharge on the insulator surface.
Each of the predetermined disconnecting switches and each of the circuit breakers is opened and closed so as to restart the power transmission using the common bus on the healthy side.

[0005]

As described above, in the conventional power line fault point locating apparatus, when an internal accident occurs on the common bus side, other sound lines and the like are also connected to the common bus on which the accident has occurred. In each case, workers had to enter the substation and visually check where the accident occurred on the common bus side in order to prevent a large number of connections and the range of radio wave interruptions from becoming large. Current transformers are provided for each section of the power line in order to eliminate this inconvenience, and fault currents and their directions are detected by these current transformers, respectively. Although it is conceivable to locate the point of occurrence, providing a current transformer with ground insulation in the high-voltage circuit increases the cost of equipment and the installation space.

SUMMARY OF THE INVENTION An object of the present invention is to provide a power line fault point locating apparatus having a simple structure and easy electrical insulation.

[0007]

According to the present invention, in order to achieve the above object, one end of a plurality of circuit breakers is connected to a common bus via a connection bus, and the other end of each of the circuit breakers is connected to the common bus. A power line fault point locating apparatus for evaluating a section of an inter-phase short-circuit accident between the common bus and the connecting bus, wherein the transmission line is connected via a power bus, and a phase-to-phase short circuit between the common bus and the connecting bus. A plurality of slave stations for detecting an accident current due to an accident are provided, and a master station which is digitally wirelessly coupled to the plurality of slave stations is provided on the ground side, and each of the slave stations has a data defining an identification code and a transmission delay time. Data is sequentially transmitted to the memory register circuit in the master station.

[0008]

The locating device for the power line accident point section according to the present invention comprises:
As described above, a slave station is provided on the power line side such as the common bus and the connection bus, and a master station is provided on the ground side. Digital slaves are connected between the slave station and the master station by digital radio. The insulation configuration can be simplified simply by attaching to the power line side without having to configure the slave station. In addition, the slave station sequentially transmits the data defining the identification symbol and the transmission delay time to the memory register circuit in the master station. Since transmission is configured, the number of frequency channels to be used can be reduced, and in the preferred embodiment, a slave station and a master station can be easily connected using radio waves of the same frequency.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a single-line diagram of a substation according to an embodiment of the present invention. A first line 1L of a transmission line is connected to one end of a circuit breaker 4 via a disconnector 3L in the substation. The other end of the circuit breaker 4 is connected to the common buses 1 and 2 via disconnectors 3X1 and 3Y1, respectively, and the transmission line 2L is also connected to the common buses 1 and 2 by the same configuration. Power transmission is performed on any of the transmission lines of such a plurality of lines. For example, with the disconnector 3Y1 closed and the disconnector 3X1 open, the power is transmitted from the common bus 2 via the circuit breaker 4 of the 1st line 1L. Power transmission is taking place. Although not shown in detail, a bus section breaker and a bus tie breaker are connected between the common buses 1 and 2.

In the substation having such a configuration, the respective devices, for example, the disconnector 3L, the circuit breaker 4, the disconnector 3X1, and the disconnector 3Y1 are connected to each other by a connection bus so as to correspond to the illustrated connection diagram. And these connection buses,
The power lines composed of the common buses 1 and 2 are supported by an insulating support 40 such as a supporting insulator, for example, as shown in FIG. 3, which is a front view showing an actual substation configuration, with the ground and the phases electrically insulated. More specifically, the line 1L of the transmission line is electrically insulated and supported on the tower 41 by the insulating support 40, while the common buses 1 and 2 are electrically connected to the anchoring tower 42 by the insulating support (not shown). Insulated and supported, a disconnector 3L and a circuit breaker 4 which are insulated from the ground are arranged between the first line 1L of the transmission line and the common buses 1 and 2, and are electrically connected by a connection bus 43. . In addition, disconnectors 3X1, 3 arranged under the common buses 1, 2 insulated from the ground.
Y1 is also connected by a connection bus 43 so as to correspond to the circuit diagram of FIG.

There is a possibility that an inter-phase short-circuit accident may occur due to the insulation breakdown of the insulating support member 40 or an external flying object to the common buses 1 and 2. Among the accidents, an inter-phase short-circuit accident which is an internal accident in the substation. 1 and 3, a voltage transformer 6 is provided on the transmission line side of the disconnector 3L, and current transformers 5O and 5I are provided on both sides of the circuit breaker 4 to locate the accident. Monitors the transmission line side more, and the current transformer 5I monitors the common buses 1 and 2 side than that. In addition, the voltage data of the voltage transformer 6 and the current data of the current transformers 50 and 51 are connected to the disconnectors 3X1 and 3Y.
1 and the open / closed state data of the circuit breaker 4 are taken into the voltage / current input circuit 7 and output to the bus protection device 8. The bus protection device 8 gives a command to the circuit breaker 4 via the trip circuit 9, The station 11 has a voltage transformer 6 and current transformers 50, 5
The voltage and current data of I and the open / closed state data of the disconnectors 3X1, 3Y1 and the circuit breaker 4 are input.
Further, on the connection bus 43 side of the connection point between the common buses 1 and 2 and the connection bus 43, the slave stations 10b and 10c for detecting the direction of the fault current are supported and provided, respectively. A slave station 10a for detecting the direction of the fault current is provided on the 1L line 1 side. These slave stations 10a, 10
b, 10c and the master station 11 are connected by a digital radio 12. Although the connection buses 43 are arranged in three phases, the slave stations 10a, 10b, and 10c do not need to be installed in these three phases. In other words, the interphase short-circuit phenomenon is a short-circuit between two phases, and since three phases are juxtaposed on the same horizontal plane as common buses 1 and 2 in FIG. 3, short-circuiting between external phases located on both sides cannot occur. This occurs only between one of the external phases and the middle phase. Therefore, the slave stations 10a, 10b, and 10c may be provided only in the connection bus 43 of the middle phase.

An interphase short-circuit accident on the 1L side of the transmission line is detected by the current transformer 50, taken into the bus protection device 8 together with the voltage data of the voltage transformer 6, and cut off via the trip circuit 9. An open command is given to the circuit breaker 4, and the circuit breaker 4 of the line 2L of the transmission line is closed to restart the power transmission.
On the other hand, the short-circuit between the phases on the common buses 1 and 2 is caused by the current data of the current transformer 5I taken into the bus protection device 8, the voltage data of the voltage transformer 6, the disconnectors 3X1, 3Y1 and Open / close state data of the circuit breaker 4 and each of the slave stations 10a, 10b, 1
The data from 0c is taken into the master station 11 to evaluate the accident point section.

Each slave station 10 thus attached to the power line
The data from a, 10b, and 10c are transmitted to the master station 11 on the ground side via the digital radio 12, but according to the Radio Law, 430 MH can be used without a license.
When a specific low-power transceiver in the z-band is used, the frequency channels are specified within 20 channels. However, if a plurality of slave stations are simply provided in accordance with the circuit configuration of the substation, the number of channels of the entire slave station is required to be as large as 50 to 100, which does not conform to the above-mentioned Radio Law. Instead of assigning a frequency every time, data related to an accident is stored, and then transmitted using radio waves of the same frequency, and received by a common master station 11 on the ground side.

A plurality of slave stations 10a, 1 provided on the power line side
The frequency by digital radio coupling between Ob and 10c and the master station 11 on the ground side is 430 MHz. As will be described later, the identification symbol and the transmission delay time for each slave station are determined by an initialization circuit provided in the slave station. By prescribing, transmission data from a plurality of slave stations can be successively emitted. Here, if the memory data related to the fault current is digitized, data can be stored in the memory register address of the master station 11 for each slave station identification code. Can be treated as the same criterion.

The table shown in FIG. 2 shows each of the slave stations 10a, 10b,
A method of evaluating the fault point section in the master station 11 based on the data from 10c is shown.

Each of the slave stations 10a, 10b and 10c sends the fault current mode to the master station as positive or negative data, and the combinations are combined into four types as shown in the figure. These data are discriminated as to whether they are in-phase or out-of-phase by a decision operation circuit which will be described later, and this information and the data taken into the bus protection device 8, that is, the disconnectors 3X1, 3Y.
Taking into account the open / closed state data of No. 1 and the voltage data of the voltage transformer 6, the fault point sections A, B,
Grade C and D. For example, the result of the determination operation based on the data from the slave stations 10a and 10c is in the opposite phase, and the other device-related data taken into the bus protection device 8 has the disconnector 3X1 opened and the disconnector 3Y1 closed. When there is further voltage data of the voltage transformer 6, the overall judgment is D, and it can be seen that the inter-phase short-circuit accident 13 has occurred at the hatched portion 14 in the circuit diagram of FIG. 4 corresponding to FIG. Also, the results of the judgment operation based on the data from the slave stations 10a and 10b are in opposite phases, and the data related to the other equipment taken into the bus protection device 8 is connected to the disconnector 3.
When X1 is opened and the voltage data of the voltage transformer 6 is present, the comprehensive judgment becomes B regardless of the state of the disconnector 3Y1, and an interphase short-circuit accident 13 occurs in the hatched portion 14 in the circuit diagram of FIG. It can be seen that this has occurred. Further child station 1
0a and the result of the judgment operation based on the data from the slave station 10c are in phase, and the other device-related data taken in the bus protection device 8 has the disconnector 3X1 opened, the disconnector 3Y1 is closed, and the voltage When there is the voltage data of the transformer 6, the overall judgment is C, and it can be seen that the inter-phase short-circuit accident 13 has occurred in the hatched portion 14 in the circuit diagram of FIG.

Next, the slave station 10 which makes the above-mentioned comprehensive judgment
A specific configuration of the power line fault point locating device composed of a, 10b, and 10c and the master station 11 will be described with reference to a block diagram shown in FIG. Since each of the slave stations has the same configuration, the slave station 10 will be described here.

The slave station 10 detects the fault current flowing through the connection bus 43 with the measuring current transformer 15. This child station 10
Is provided with a drive power supply circuit 24 having a solar cell charging circuit (not shown) so as to be able to drive even when the connection bus 43 is disconnected from the main circuit. The current transformer for measurement 15 is connected to a transceiver 19 via a threshold circuit 16, an A / D conversion circuit 17, a memory circuit 18 and a transmission command circuit 19. Transceiver 19 and A
A reception command circuit 22 and a simulated signal generation circuit 23 are connected between the A / D conversion circuit 17 and the memory circuit 1.
8, an initial value setting circuit 21 is connected to the transmission command circuit 19 and the reception command circuit 22. The initial value setting circuit 21 includes all the slave stations 1 provided for each line.
0a, 10b, and 10c have unique identification numbers No. And a transmission delay time Δt corresponding to this are determined in advance.

On the other hand, the master station 11 is connected to the slave station 10 by a digital radio 12, and its transceiver 20 includes a shaping circuit 25, a memory register circuit 26, and a decision operation circuit 2.
7 is connected to the overall judgment circuit 28. The bus protection device 8 is also connected to the comprehensive judgment circuit 28 in order to obtain data related to other devices.
9 is output. Further, the transceiver 20 and the decision operation circuit 27
The operation test circuit 30 is connected between them.

Next, the operation of the locating device for the power line fault point section shown in FIG. 7 will be described.

Assuming that an inter-phase short-circuit fault has occurred, a fault current having a sudden rising first wave flows like a bus current I shown in FIG. 8, and the subsequent second wave is a sine wave. The threshold circuit 16 detects that the first wave has exceeded a predetermined threshold current, and the second wave is A / D converted by the A / D conversion circuit 17 and stored in the memory circuit 18. The initial setting circuit 21 has a unique identification number No. corresponding to each slave station in advance. And the transmission delay time Δt are determined.
Unique identification number No. transmitted after t1. The slave station 10b has a unique identification number No. to be transmitted after @ t2. These are taken out of the memory circuit 18 and are transmitted from the transceiver 20 by the transmission command circuit 19 to the digital wireless coupling 12.
To send over. Up to now, since all processes have been performed simultaneously, the reference point is the same when the phase of the second wave is compared.
0a transmission delay time △ t _1, since the slave station 10b is a transmission delay time △ t _2, respectively transmission delay time △ t initialized, will be sequentially transmitted.

As described above, the threshold circuit 16 is provided in the slave station 10.
Is provided, the threshold value is reliably detected at the fault current level including the abrupt transient of the first wave, and the memory circuit 18 provides a stable waveform suitable for phase comparison when the second wave is a sine wave. Is stored, the determination reliability is improved. At this time, the plurality of slave stations store the second wave at the same time, but since the transmission is sequentially performed at a time when the noise is small after the interruption of the fault current is completed, the reliability of the phase comparison in the determination operation circuit 27 is improved. . As shown in FIG. 8, the transmission command circuit 19
Master station 1
1 can be prevented from receiving errors.

Thereafter, these data are received by the transceiver 20 of the master station 11 which is digitally wirelessly coupled to the slave station 10, and are sequentially stored in the memory register circuit 26 via the shaping circuit 25. The circuit 26 has an identification number No. of each slave station as shown in FIG. Each time, the data is rearranged in parallel by subtracting the transmission delay time Δt. Then, FIG.
As described above, the judgment operation circuit 27 judges whether the data is in phase or out of phase from the data of each slave station, and outputs the output together with the data related to other devices from the bus protection device 8 to the comprehensive judgment circuit 28. , And the results are output by the output device 29. As described above, since the transmission operation by the transmission command circuit 19 is sequentially performed in the transmission mode, the digital data of the slave station 10b is input to the memory register circuit 26 of the master station 11 next to the digital data of the slave station 10a. Thus, the reference points of the digital data of the respective slave stations easily match, and the subsequent determination operation circuit 27 can process the data slowly.

In the power line fault point locating device, an operation test circuit 30 is provided in the master station 11 as shown in FIG.
0, the signal from the transceiver 20 in the master station 11 is received by the transceiver 20 in the slave station 10 via the digital radio coupling 12 and the simulation signal generation circuit 23 is received via the reception command circuit 22. Operate. As a result, the simulation signal generation circuit 23 transmits the test data to the A / D converter 17, and thereafter, shifts to the transmission mode, and through the memory circuit 18 and the transmission command circuit 19, the transceiver 20 in the slave station 10.
Is sent to the transceiver 20 in the master station 11 and the shaping circuit 2
5. By detecting the signal transmitted through the memory register circuit 26 and the determination operation circuit 27 by appropriate means, it can be confirmed that the above-described configuration operates normally. Therefore, by the answerback test function from the master station, the slave station on the power line side can be periodically diagnosed, and its reliability can be improved.

In the above-described embodiment, the common master station 11 is provided for each slave station in the substation. However, the slave stations are divided into a plurality of groups, and the master station is assigned to each group. May be provided. However, the slave station is provided only in the middle phase of the power line, and the connection bus 43 side at the connection portion between the common buses 1 and 2 and the connection bus 43 as shown in FIG.
By providing the slave stations 10a, 10b, and 10c on the side of the transmission line, the localization apparatus for the power line fault point section can be configured with only one master station 11.

[0027]

As described above, in the power line fault point locating apparatus according to the present invention, the plurality of slave stations provided on the power line side and the master station provided on the ground side are connected by digital radio connection. Each slave station can transmit data to the master station on the ground side without extensive insulation using an insulator or the like that is insulated from the ground, and each slave station can send data to the master station with different identification numbers and transmission delay times. Since transmission is performed to the stations, the configuration can be simplified as a small number of master stations for a plurality of slave stations.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a substation using an apparatus for locating a power line fault point section according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a comprehensive determination method by a locating device of a power line accident point section in FIG. 1;

FIG. 3 is a front view of a substation configured based on the circuit diagram of FIG.

FIG. 4 is a circuit diagram showing only a main part of the circuit diagram of FIG. 1;

FIG. 5 is a circuit diagram showing another main part of the circuit diagram of FIG. 1;

FIG. 6 is a circuit diagram showing still another main part of the circuit diagram of FIG. 1;

FIG. 7 is a block diagram showing details of a power line fault point locating apparatus shown in FIG. 1;

FIG. 8 is a waveform diagram showing data processing by the locating device for the power line fault point section shown in FIG.

[Explanation of symbols]

 1, 2 common bus 4 breaker 10, 10a, 10b, 10c slave station 11 master station 12 digital wireless coupling 18 memory circuit 19 transmission command circuit 20 transceiver 21 initial setting circuit 26 memory register circuit 27 judgment operation circuit 28 general judgment circuit 30 operation test circuit 43 bus for connection

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-12567 (JP, A) JP-A-2-17469 (JP, A) JP-A-63-287323 (JP, A) JP-A-62-1987 272163 (JP, A) JP-A-58-180960 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) G01R 31/08

Claims (5)

(57) [Claims] An end of a plurality of circuit breakers is connected to a common bus via a connection bus, and a transmission line is connected to the other end of each circuit breaker via a connection bus, respectively. In a power line fault point locating apparatus for evaluating a section of an interphase short-circuit accident between a bus and a connecting bus, a plurality of slave stations for detecting an accident current due to an interphase short-circuit are provided on the common bus and the connecting bus, and a ground side is provided. A master station digitally wirelessly coupled to the plurality of slave stations. Each of the slave stations sequentially transmits data defining an identification code and a transmission delay time to a memory register circuit in the master station. A location device for a power line accident point section, characterized in that: 2. The connecting station according to claim 1, wherein the slave station is connected to the connection bus at a connection portion between the common bus and the connection bus, and to the connection at the transmission line side of the circuit breaker. A locating device for a power line accident point section, which is provided on each of a bus and a bus. 3. The connection bus according to claim 1, wherein the connection bus includes three juxtaposed three-phase buses, and the slave station includes a connection bus side at a connection portion between the common bus and the connection bus. A locating device for a power line fault point section, wherein the locating device is provided on each of the connection bus on the transmission line side of the circuit breaker, and is provided only on a middle phase located in the middle of the three phases. 4. An apparatus according to claim 1, wherein said master station is provided with an operation test circuit, and said slave station is provided with a simulation data generation circuit which operates according to a command from said operation test circuit. Location device for power line accident point section. 5. One end of each of a plurality of circuit breakers is connected to a common bus via a connection bus, and a transmission line is connected to the other end of each breaker via a connection bus. And a bus protection device for receiving data related to other devices from the voltage transformer provided on the transmission line side of each of the circuit breakers and the common bus and the connection bus. In the power line fault point locating apparatus for evaluating a section of an interphase short-circuit fault, a plurality of slave stations for detecting fault current due to an interphase short-circuit fault are provided on the common bus and the connection bus, and the plurality of slave stations are provided on the ground side. A master station digitally coupled to the station is provided, and each of the slave stations sequentially transmits data defining an identification symbol and a transmission delay time to a memory register circuit in the master station. Memory register above A power line fault point, comprising: a judgment operation circuit for judging and calculating data of a star circuit; and a comprehensive judgment circuit for locating a fault point section from data related to other devices of the bus protection device. Section location device.