CN106646081A - Power grid line fracture monitoring device - Google Patents

Power grid line fracture monitoring device Download PDF

Info

Publication number
CN106646081A
CN106646081A CN201611137032.1A CN201611137032A CN106646081A CN 106646081 A CN106646081 A CN 106646081A CN 201611137032 A CN201611137032 A CN 201611137032A CN 106646081 A CN106646081 A CN 106646081A
Authority
CN
China
Prior art keywords
current sensor
load
line
branch circuit
primary
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
CN201611137032.1A
Other languages
Chinese (zh)
Inventor
芮骏
余银钢
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Anhui Electric Technology Ltd By Share Ltd
Original Assignee
Anhui Electric Technology Ltd By Share Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Anhui Electric Technology Ltd By Share Ltd filed Critical Anhui Electric Technology Ltd By Share Ltd
Priority to CN201611137032.1A priority Critical patent/CN106646081A/en
Publication of CN106646081A publication Critical patent/CN106646081A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections

Abstract

The present invention discloses a power grid line fracture monitoring device. The power grid line fracture monitoring device is composed of a branch circuit (2) as well as a current sensor (3), a measurement and control component (4) and a system load (5), wherein the branch circuit (2) is connected with a trunk bus-bar (1), and the current sensor (3), the measurement and control component (4) and the system load (5) are connected onto the branch circuit (2); the primary side of the current sensor (3) is connected with the tail end of the branch circuit (2) and the front end of the system load (5); the secondary side of the current sensor (3) is electrically connected with the input end of the measurement and control component (4); the primary side of the current sensor (3) is connected in series into the loop of the branch circuit (2); the primary side of the current sensor (3) sleeves the branch circuit (2); the current sensor (3) is a three-phase current sensor; and the system load (5) is an inductive load, capacitive load, or resistive load. The power grid line fracture monitoring device can accurately identify the line fracture accident of the branch circuit and can be widely applied to the determination of single-phase or multi-phase line fracture accidents occurring on 0.4 to 35kV overhead lines.

Description

Power network line disconnection monitor
Technical field
The present invention relates to a kind of disconnection monitor, especially a kind of power network line disconnection monitor.
Background technology
In the distribution network system of the 0.4~35kV of China, loop of the widely used trolley line as supply network.It is built on stilts Easily there is single-phase or multiphase line-outage contingency under by the effect of the external force such as natural calamity, shock in circuit.For such accident, There is the branched line of line-outage contingency because differentiating exactly in the comprehensive protector of the outgoing line cabinet in system, also just cannot control Breaker processed cuts off the normal operation of the line-outage contingency branched line and recovery system, and personnel casualty accidentses are often resulted in when thus Occur.To solve this problem, people are made that various effort, such as in " electric distribution network overhead wire disconnection fault positioning ", Qu Gang, Deng,《Electric Power Automation Equipment》The 12nd phase page 35~38 of volume 25, a kind of distribution line failure meter disclosed in December, 2005 Calculation method enters row line single-phase wire break fault distinguishing and positioning.The distribution line fault calculation methods for transmission referred in this article is based on and is electrically connected The sensing element and distribution transformer being connected on branched line, and the observing and controlling part electrically connected with sensing element, wherein, sensing Part is placed in the top of branched line;After it there is disconnection fault, observing and controlling part first according to the voltage at branched line top and Electric current carries out fault distinguishing, is then calculated, when calculate certain distribution transforming node-flow to the current value of next node be zero can Can property it is maximum and meeting when break voltage block condition herein, that is, judge this distribution transforming and be thereafter disconnection fault between distribution transforming Point.Though the fault location that this technical scheme can be broken, but also weak point is there is, first, branched line identification Accuracy rate is low, and its cause is, when there is disconnection fault in the branched line of distribution network system, the electricity at branched line top The impact of stream signal acceptor's fundatrix line, changes unobvious, it is impossible to effectively reflect the current characteristic of system outages;Secondly, need Using more sensor, voltage sensor was both needed, current sensor had been needed again;Again, need two steps to judge, mistake and cause delay.
The content of the invention
The technical problem to be solved in the present invention is to overcome weak point of the prior art, there is provided a kind of simple structure, can Accurately identify the power network line disconnection monitor of branched line broken string with settling at one go.
For solve the present invention technical problem, the technical scheme for being adopted for:Power network line disconnection monitor is by connecting The branched line of trunk bus, and current sensor, observing and controlling part and the system load composition connected on branched line, especially It is,
The primary side of the current sensor is connected to the front end of the end of branched line, system load, secondary side and survey The input electrical connection of control part.
As the further improvement of power network line disconnection monitor:
Preferably, the primary side of current sensor is serially connected with the loop of branched line.
Preferably, the primary side of current sensor is socketed on outside branched line.
Preferably, current sensor is three-phase current sensor.
Preferably, system load is inductive load, or capacitive load, or resistive load.
It is relative to the beneficial effect of prior art:
After using such structure, both simple structures, and because the primary side of current sensor is connected to branched line End, also because it is connected to the front end of system load, more because the secondary side of current sensor and the input of observing and controlling part are electric Connection, so as to when there is the line-outage contingency of branched line, without range attenuation when current sensor easily captures broken string Instantaneous mutation electric current, and by it is this comprising angle, uprush, fall and the transient current variable quantity of the information such as markers is sent to observing and controlling Part, is realized accurately identifying the branched line broken string with settling at one go by observing and controlling part according to the decision logic of setting, is made It can be widely used in there is single-phase or multiphase line-outage contingency judgement to 0.4~35kV overhead transmission lines.
Description of the drawings
Fig. 1 is a kind of basic structure circuit theory diagrams of the present invention.
Specific embodiment
The preferred embodiment of the present invention is described in further detail below in conjunction with the accompanying drawings.
Referring to Fig. 1, the composition of power network line disconnection monitor is as follows:
Some branched lines 2 are connected on trunk bus 1, current sensor 3, observing and controlling portion are connected with branched line 2 Part 4 and system load 5;Wherein, the primary side of current sensor 3 is connected to the end of branched line 2, the front end of system load 5, Secondary side is electrically connected with the input of observing and controlling part 4.
The primary side of aforementioned currents sensor 3 can be serially connected with the loop of branched line 2, it is also possible to be socketed on branch line Outside road 2.
Current sensor 3 be a three-phase current sensor, alternatively three monophase current sensors.
System load 5 is inductive load (alternatively capacitive load or resistive load).
When using, according to trunk bus 1, branched line 2, current sensor 3, observing and controlling part 4 is connected shown in Fig. 1 and need to be only System load 5.When branched line 2 occurs line-outage contingency, current sensor 3 will certainly monitor this branch line in distribution network system The transient current variable quantity of the end of road 2, and observing and controlling part 4 is sent to, the identification of broken string is made to it by observing and controlling part 4.
Obviously, those skilled in the art can to the present invention power network line disconnection monitor carry out it is various change and Modification is without departing from the spirit and scope of the present invention.So, if these modifications and modification to the present invention belong to power of the present invention Within the scope of profit requirement and its equivalent technologies, then the present invention is also intended to comprising these changes and modification.

Claims (5)

1. a kind of power network line disconnection monitor, by the branched line (2) of connection trunk bus (1), and branched line (2) The current sensor (3) of upper connection, observing and controlling part (4) and system load (5) composition, it is characterised in that:
The primary side of the current sensor (3) is connected to the end of branched line (2), the front end of system load (5), secondary side Electrically connect with the input of observing and controlling part (4).
2. power network line disconnection monitor according to claim 1, is characterized in that the primary side string of current sensor (3) In being connected to the loop of branched line (2).
3. power network line disconnection monitor according to claim 1, is characterized in that the primary side set of current sensor (3) It is connected to branched line (2) outward.
4. the power network line disconnection monitor according to Claims 2 or 3, is characterized in that current sensor (3) is three-phase Current sensor.
5. power network line disconnection monitor according to claim 1, is characterized in that system load (5) is inductive load, Or capacitive load, or resistive load.
CN201611137032.1A 2016-12-12 2016-12-12 Power grid line fracture monitoring device Withdrawn CN106646081A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201611137032.1A CN106646081A (en) 2016-12-12 2016-12-12 Power grid line fracture monitoring device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201611137032.1A CN106646081A (en) 2016-12-12 2016-12-12 Power grid line fracture monitoring device

Publications (1)

Publication Number Publication Date
CN106646081A true CN106646081A (en) 2017-05-10

Family

ID=58824213

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201611137032.1A Withdrawn CN106646081A (en) 2016-12-12 2016-12-12 Power grid line fracture monitoring device

Country Status (1)

Country Link
CN (1) CN106646081A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109470993A (en) * 2018-11-07 2019-03-15 南京国电南自电网自动化有限公司 A kind of single-phase wire break fault detection method suitable for power distribution network

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06347503A (en) * 1993-06-10 1994-12-22 Nissin Electric Co Ltd Ground fault position locating apparatus
CN103293443A (en) * 2013-05-20 2013-09-11 国家电网公司 Overhead wire grounding fault locating method for power distribution network
CN203204115U (en) * 2013-04-27 2013-09-18 王鹏 Control circuit for selection of single-phase ground faults of low-current system
CN104251959A (en) * 2014-09-18 2014-12-31 云南电网公司电力科学研究院 Method and device for positioning and detecting single-phase grounding fault of power distribution grid

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06347503A (en) * 1993-06-10 1994-12-22 Nissin Electric Co Ltd Ground fault position locating apparatus
CN203204115U (en) * 2013-04-27 2013-09-18 王鹏 Control circuit for selection of single-phase ground faults of low-current system
CN103293443A (en) * 2013-05-20 2013-09-11 国家电网公司 Overhead wire grounding fault locating method for power distribution network
CN104251959A (en) * 2014-09-18 2014-12-31 云南电网公司电力科学研究院 Method and device for positioning and detecting single-phase grounding fault of power distribution grid

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
屈刚 等: "配电网架空线路断线故障定位", 《电力自动化设备》 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109470993A (en) * 2018-11-07 2019-03-15 南京国电南自电网自动化有限公司 A kind of single-phase wire break fault detection method suitable for power distribution network

Similar Documents

Publication Publication Date Title
CN103116107B (en) A kind of high-voltage DC power supply insulating monitor
KR100709980B1 (en) Method and apparatus for detecting a fault section using comparison of phase difference and magnitude difference bewteen zero phase currents in ungrounded distribution power systems
CN101261301A (en) Locomotive control loop grounding detection circuit and grounding detection method and wire break detection method
CN101738560A (en) Unbalanced electric bridge-based grounding detection circuit for locomotive control loop
EP2895873B1 (en) Gsm/gprs system to detect and locate high impedance faults on medium voltage distribution networks in high resistivity areas
CN102818969A (en) Directional detection of resistive earth fault and medium-voltage conductor breakage
CN102937687A (en) Method for distinguishing disconnection fault and grounding fault during grounding of neutral point through small resistor
CN201181321Y (en) Earthing detection circuit of locomotive control circuit
CN104849602A (en) GIS double-bus distribution equipment fault detection method and system
CN203204115U (en) Control circuit for selection of single-phase ground faults of low-current system
CN103840438B (en) The detecting system of the intellectualized switchgear ground protection function of distribution network systems
CN106646081A (en) Power grid line fracture monitoring device
CN101556319A (en) Ground fault detection and calibration method and device for direct current system
CN206321739U (en) Power network line disconnection monitor
CN204333937U (en) Detect the intellectualized detection device based on the intellectualized switchgear one-phase ground protection function of 10kV isolated neutral distribution network systems
CN101345408A (en) Method for assigning a residual current to one of the three phase currents of a three-phase system and residual current protection switch
CN203720293U (en) Device used for monitoring DC insulation bus interaction
CN105044519A (en) On-line identification method for DC interconnection and mixed use of transformer station
CN203178409U (en) Direct current grounding line selection device
CN207200251U (en) A kind of power distribution network self-powered protective relaying device
CN202837471U (en) Low-current grounding system single-phase earth fault wire discrimination device
CN104578004A (en) Quick low-voltage power supply fault isolating device with automatic load balance function
CN104076315B (en) On-load calibration method for polarity of high-transformation-ratio current transformer (CT)
CN108181553A (en) A kind of small current neutral grounding system single-phase wire break fault section location method based on line voltage variation characteristic
CN107294071A (en) The guard method of power distribution network small resistance grounding system and device

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
WW01 Invention patent application withdrawn after publication

Application publication date: 20170510

WW01 Invention patent application withdrawn after publication