CN203553881U - Overhead lines and cable hybrid adaptive reclosing device - Google Patents

Abstract

The utility model discloses an adaptive reclosing device for an overhead line and a cable hybrid line, comprising: a voltage traveling wave detection module, an optical fiber communication module, a fault precise positioning module and an adaptive reclosing lock control module; wherein: the voltage traveling The wave detection module is connected to the fault precise positioning module; the optical fiber communication module is connected to the fault precise positioning module; the fault precise positioning module is connected to the self-adaptive reclosing locking control module. The utility model fully utilizes the advantages of voltage traveling wave detection, realizes accurate positioning of hybrid line faults, and simultaneously overcomes the blindness of reclosing switching of hybrid lines in the prior art.

Description

A self-adaptive reclosing device for overhead line and cable mixed line

technical field

The utility model relates to the technical field of relay protection for overhead wire and cable hybrid lines in electric power systems, in particular to an adaptive reclosing device for overhead wire and cable hybrid lines.

Background technique

At present, there are a large number of mixed lines of overhead lines and cables in the distribution network. Since the overhead line travels through the mountains and the cable line is deeply buried underground, it is difficult to determine the exact location of the fault when the overhead line or cable fails. Therefore, the rapid, accurate and automatic positioning of the fault point of the power line is to speed up the repair of the power line and reduce power outages. time is of the essence. The traditional location method based on fault steady-state quantity is affected by factors such as system operation mode and measurement error, and cannot achieve accurate location of the fault point. Moreover, when a power line fails, the recloser needs to distinguish between a cable fault or an overhead line fault. According to statistics, about 90% of overhead line faults are instantaneous faults, which require reclosing, while cable line faults are generally permanent faults, which do not require reclosing. If the reclosing fault occurs on the cable, it will cause a secondary fault cable impact on the cable, which will increase the damage of the cable, and will also increase the fault disturbance to the power grid. And how to control it is also an urgent problem to be solved in the development of smart grid.

Utility model content

In view of this, the utility model provides an adaptive reclosing device for a hybrid line of overhead lines and cables, so as to accurately locate the fault of the hybrid line and overcome the blindness of reclosing switching of the hybrid line.

In order to solve the above technical problems, the technical solution adopted by the utility model is: an adaptive reclosing device for an overhead wire and cable hybrid line, including: a voltage traveling wave detection module, an optical fiber communication module, a fault precise positioning module and an adaptive reclosing device Lockout control module; where:

The voltage traveling wave detection module is connected with the precise fault location module;

The optical fiber communication module is connected to the precise fault location module;

The precise fault location module is connected with the self-adaptive recloser locking control module.

Preferably, the voltage traveling wave detection module includes: a voltage traveling wave head signal acquisition unit, a GRS satellite timing unit and a traveling wave head arrival time recording unit; wherein:

The voltage traveling wave head signal acquisition unit is connected to the GRS satellite timing unit;

The GRS satellite timing unit is connected with the traveling wave head arrival time recording unit.

Preferably, the precise fault location module includes: a fault location calculation unit, a historical data storage unit, and a fault information publishing unit; wherein:

The fault location calculation unit is respectively connected with the arrival time recording unit of the traveling wave head, the optical fiber communication module and the historical data storage unit;

The historical data storage unit is connected to the fault information publishing unit.

Preferably, the adaptive reclosing locking control module includes: a locking control unit, an opening unit and an opening unit; wherein:

The blocking control unit is respectively connected with the fault location calculation unit, the switch-in unit and the switch-out unit.

It can be seen from the above technical solutions that the utility model discloses an adaptive reclosing device for hybrid lines of overhead lines and cables, which collects the voltage traveling wave signal through the voltage traveling wave detection module, and transmits the fault initial voltage traveling wave wave head through the optical fiber communication module. The time of arrival at the opposite substation is sent to the precise fault location module, which locates the fault point according to the time difference of the fault initial voltage traveling wave head transmitted between the two substations through the fault precise location module, and uses the self-adaptive reclosing block control module to accurately locate the fault point The positioning result of the positioning module controls the reclosing, fully utilizes the advantages of voltage traveling wave detection, realizes accurate positioning of hybrid line faults, and overcomes the blindness of hybrid line reclosing switching in the prior art.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a structural schematic diagram of an adaptive reclosing device for an overhead wire and cable hybrid line disclosed in an embodiment of the present invention;

Fig. 2 is a structural schematic diagram of an adaptive reclosing device for a hybrid overhead line and cable line disclosed in another embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

The embodiment of the utility model discloses an adaptive reclosing device for a hybrid line of overhead lines and cables, so as to accurately locate the fault of the hybrid line and overcome the blindness of reclosing switching of the hybrid line.

As shown in Figure 1, an adaptive reclosing device for an overhead wire and cable hybrid line includes: a voltage traveling wave detection module, an optical fiber communication module, a fault precise location module and an adaptive reclosing lock control module; wherein:

The voltage traveling wave detection module is respectively connected with the fault precise positioning module, and the input terminal of the voltage traveling wave detection module is also connected with the core-through traveling wave sensor installed on the grounding of the bus transformer iron core;

The optical fiber communication module is connected with the precise fault location module;

The precise fault location module is connected with the self-adaptive reclosing locking control module, and the output terminal of the fault precise location module is also connected with the display installed in the main control room;

The output terminal of the adaptive reclosing lock control module is connected with the relay installed in the reclosing control signal output circuit of the microcomputer protection device.

In the above-described embodiment, the setting value of 0.5 times of the amplitude of the fault voltage traveling wave signal is stored in the voltage traveling wave detection module as the detected setting value; the voltage traveling wave detection module collects the voltage traveling wave signal through the sensor, when the voltage traveling wave detection module If the detected voltage traveling wave value is greater than the set value, it is judged that the voltage traveling wave signal at this time is a grid fault voltage traveling wave signal; the time when the initial fault voltage traveling wave head reaches the opposite substation is sent to the fault precise positioning module through the optical fiber communication module The voltage traveling wave detection module sends the time when the initial fault voltage traveling wave head arrives at the local substation to the fault precise location module connected to it, and the fault precise location module transmits the time difference between the two substations according to the initial fault voltage traveling wave head Locate the fault point, display the result of the fault location on the monitor and send the fault location result to the adaptive reclosing locking control module connected to it; the adaptive reclosing locking control module judges according to the received fault location result Whether the fault is a cable fault or an empty overhead line fault, if the fault is on the empty overhead line, the relay will be activated to connect the reclosing control signal output circuit, and the reclosing signal will be output normally. If the fault is on the cable, the relay will not be activated and disconnected The reclosing control signal output circuit blocks the reclosing signal.

The utility model also discloses an adaptive reclosing device for an overhead wire and cable hybrid line, as shown in Figure 2, including: a voltage traveling wave detection module, an optical fiber communication module, a fault precise positioning module and an adaptive reclosing locking control module ;in:

The voltage traveling wave detection module includes: a voltage traveling wave head signal acquisition unit, a GRS satellite timing unit and a traveling wave head arrival time recording unit; the voltage traveling wave wave head signal acquisition unit is connected with the GRS satellite timing unit; It is also connected with the core-through traveling wave sensor installed on the ground of the bus transformer iron core; the GRS satellite timing unit is connected with the traveling wave head arrival time recording unit; the traveling wave head arrival time recording unit is connected with the fault location calculation unit;

The optical fiber communication unit is connected with the fault location calculation unit;

The precise fault location module includes: a fault location calculation unit, a historical data storage unit, and a fault information release unit; the fault location calculation unit is connected to the locking control unit; the historical data storage unit is connected to the fault information release unit, and the fault information release unit is also connected to the main control unit Display connections for indoor installations;

The self-adaptive reclosing locking control module includes: locking control unit, opening-in unit and opening-out unit; wherein: the locking control unit is connected to the fault location calculation unit, opening-in unit and opening-out unit respectively, and the opening-in unit is connected to overhead lines and cables The relevant contacts of the secondary circuit of the mixed line (such as the trip contacts of the three phases, the reclosing contacts, etc.) are connected, and the output unit is connected with the relay installed in the reclosing control signal output circuit of the microcomputer protection device.

In the above-mentioned embodiment, 0.5 times of the amplitude of the fault voltage traveling wave signal is stored in the voltage traveling wave detection module as the setting value detected; the voltage traveling wave head signal acquisition unit collects the voltage traveling wave signal through the sensor, If the voltage traveling wave value detected by the acquisition unit is greater than the set value, it is judged that the voltage traveling wave signal at this time is a grid fault voltage traveling wave signal; the time when the initial fault voltage traveling wave head reaches the opposite substation is sent to the fault location through the optical fiber communication module Calculation unit; the arrival time recording unit of the traveling wave head sends the received time when the initial fault voltage traveling wave head arrives at the substation at the local end to the fault location calculation unit connected to it, and the GRS satellite timing unit performs interference elimination on the fault voltage traveling wave signal to ensure The clock synchronization accuracy of the local substation and the remote substation of the hybrid line under interference; the fault location calculation unit locates the fault point according to the time difference of the initial fault voltage traveling wave head transmitted between the two substations, and sends the fault location result to the history The data storage unit and the fault information publishing unit display through the display and send the fault location result to the blocking control unit connected to it; the blocking control unit judges whether the fault is a cable fault or an overhead line fault according to the received fault location result, If the fault is on the overhead line, the relay is activated through the opening unit to connect the reclosing control signal output circuit, and the reclosing signal is output normally; if the fault is on the cable, the relay is not activated, and the reclosing control signal output circuit is disconnected , to block the reclosing signal.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other.

The above description of the disclosed embodiments enables those skilled in the art to realize or use the utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims (4)

1. An adaptive reclosing device for an overhead line and cable hybrid line, comprising: a voltage traveling wave detection module, an optical fiber communication module, a fault precise location module and an adaptive reclosing lock control module; wherein: The voltage traveling wave detection module is connected with the precise fault location module; The optical fiber communication module is connected to the precise fault location module; The precise fault location module is connected with the self-adaptive recloser locking control module. 2. The adaptive reclosing device for overhead lines and cable hybrid lines according to claim 1, wherein the voltage traveling wave detection module comprises: a voltage traveling wave head signal acquisition unit, a GRS satellite timing unit and a traveling wave head arrival time unit of record; where: The voltage traveling wave head signal acquisition unit is connected to the GRS satellite timing unit; The GRS satellite timing unit is connected with the traveling wave head arrival time recording unit. 3. The adaptive reclosing device for overhead lines and cable hybrid lines according to claim 2, wherein the precise fault location module includes: a fault location calculation unit, a historical data storage unit, and a fault information release unit; wherein: The fault location calculation unit is respectively connected with the arrival time recording unit of the traveling wave head, the optical fiber communication module and the historical data storage unit; The historical data storage unit is connected to the fault information publishing unit. 4. The adaptive reclosing device for overhead line and cable hybrid line according to claim 3, characterized in that, the adaptive reclosing locking control module comprises: a locking control unit, an opening unit and an opening unit; wherein: The blocking control unit is respectively connected with the fault location calculation unit, the switch-in unit and the switch-out unit.

Images