CN208334506U - A kind of on-Line Monitor Device measuring power line conductive line connection point contact impedance - Google Patents
A kind of on-Line Monitor Device measuring power line conductive line connection point contact impedance Download PDFInfo
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- CN208334506U CN208334506U CN201820584718.3U CN201820584718U CN208334506U CN 208334506 U CN208334506 U CN 208334506U CN 201820584718 U CN201820584718 U CN 201820584718U CN 208334506 U CN208334506 U CN 208334506U
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- current transformer
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- transmitting loop
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- monitoring circuit
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Abstract
The utility model discloses a kind of on-Line Monitor Devices for measuring power line conductive line connection point contact impedance, and comprising main transmitting loop, auxiliary monitoring circuit and monitoring terminal, auxiliary monitoring circuit is attempted by main transmitting loop；The main transmitting loop includes main transmitting loop tie point, current transformer group one, and current transformer group one is mounted on main transmitting loop；The auxiliary monitoring circuit includes measuring resistance, current transformer group two, and measuring resistance is connected in auxiliary monitoring circuit, and current transformer group two is mounted on auxiliary monitoring circuit；The current transformer group one, current transformer group two secondary circuit with monitoring terminal be electrically connected.Monitoring terminal acquires main transmitting loop electric current and auxiliary monitoring loop current by current transformer group one, group two respectively, in conjunction with the measuring resistance resistance value on auxiliary monitoring circuit, calculate the contact impedance of main transmitting loop tie point, by monitoring the data function transmission of terminal, real-time monitoring connects point impedance and heating power.
Description
Technical field
The utility model relates to the problem of electrical conductor (conducting wire) tie point contact impedance exception, specifically a kind of measurement is defeated
The on-Line Monitor Device of electric wire line conductor tie point contact impedance.
Background technique
Conducting wire tie point is numerous in transmission line of electricity, and transmission line of electricity tie point is the big weak spot of route running one,
Often fever is burnt out in operation, to cause power outage, just will affect the peace of whole route when a certain contact breaks down
Row for the national games, greatly reduces power supply reliability.
In order to monitor transmission line of electricity tie point heat condition, the mode generallyd use at present is directly to measure its temperature, is led to
Cross artificial in-site measurement.Such as remote viewing temperature painting model piece method, remote infrared radiation thermometer etc..
Remote viewing temperature painting model piece method adsorbs the temperature patch of multiple and different colors in wire link point in advance, they can be
Melt under different temperatures, melts situation by the various patches of sem observation of looking in the distance, to judge temperature approximate range；Remote infrared survey
Wen Yi is commonplace method at present, using far infrared detection transmission line of electricity tie point fever thermometric.
Manual measurement is usually targetedly to be surveyed with load boom period to key line before load peak is arrived
Amount.Cannot accomplish the effects of real-time monitoring to all delivery routes, obtain conducting wire tie point heat condition at the first time, so as to and
When grasp catastrophic discontinuityfailure possibility, effectively control differentiation of the defect to accident.
In power generation, Safety first, precaution crucial.How to prevent tie point fever to cause grid loss to be one important
Work.For this purpose, there is an urgent need to a kind of on-line monitoring systems to monitor transmission line of electricity tie point contact impedance anomalous variation.
Summary of the invention
The utility model provides a kind of on-Line Monitor Device for measuring power line conductive line connection point contact impedance, includes master
Transmitting loop, auxiliary monitoring circuit and monitoring terminal, auxiliary monitoring circuit is attempted by main transmitting loop；
Main transmitting loop includes main transmitting loop tie point, current transformer group one, and current transformer group one is mounted on master
On transmitting loop；
Auxiliary monitoring circuit includes measuring resistance, current transformer group two, and measuring resistance is connected in auxiliary monitoring circuit,
Current transformer group two is mounted on auxiliary monitoring circuit；
Current transformer group one, current transformer group two secondary circuit with monitoring terminal be electrically connected；
Monitoring terminal includes current sample, CPU processor, communication module.Monitoring terminal has data-transformation facility, can lead to
Wired or wireless mode is crossed to carry out data transmission.
When transmission line of electricity is powered on, monitoring terminal acquires the secondary current in current transformer group two, calculates auxiliary
Electric current I ' in monitoring circuit, the resistance value R ' of measuring resistance is it is known that can calculate the pressure of standard resistor at two terminals according to △ U=I ' R '
△ U drops, this pressure drop is the pressure drop at auxiliary monitoring circuit both ends.Because auxiliary monitoring circuit is attempted by main transmitting loop, institute
Pressure drop with auxiliary monitoring circuit is exactly the pressure drop △ U of main transmitting loop.Monitor two in terminal acquisition current transformer group one
Primary current calculates the electric current I in main transmitting loop, can calculate contact impedance R=△ U/I of main transmitting loop tie point, into
One step calculates heating power P=I on tie point2R。
The ingenious place of the method is: under normal circumstances, transmission line of electricity tie point contact impedance R is generally in tens micro-ohms
Between to several hundred micro-ohms, the resistance value of the measuring resistance R ' in auxiliary monitoring circuit is according to the electric current I range of main transmitting loop and master
The normal contact impedance of transmitting loop tie point R is selected, and general R ' is in several Europe of zero point between several Europe.Therefore auxiliary monitoring
The electric current I ' generated in circuit only has several one thousandths in main transmitting loop, is greatly lowered auxiliary monitoring circuit in this way
Electric current, and then the technical requirements of device substantially reduce in auxiliary monitoring circuit, range of choice is more extensive, simultaneously as auxiliary prison
Survey time road is connected in parallel on main transmitting loop, will not be to the normal fortune of main transmitting loop even if auxiliary monitoring circuit disconnects
Row impacts.
This method is suitable for ultra-high-tension power transmission line, can be according to electric current by measuring transmission line of electricity tie point contact impedance
Variation tendency obtain the variation tendency of the heating power due to caused by contact impedance, fortune inspection personnel can decide whether to need to mention
Preceding maintenance, the defect of fever trend cannot accurately be prejudged by solving common temp measuring method, so that the work of fortune inspection personnel has more
Specific aim improves working efficiency, to save artificial.
Detailed description of the invention
Fig. 1 is the circuit theory schematic diagram of the utility model:
In figure: 1. main transmitting loops, 2. main transmitting loop tie points, 3. auxiliary monitoring circuits, 4. measuring resistances, 5. electric currents
Mutual inductor group one, 6. current transformer groups two, 7. monitor terminal.
Specific embodiment
According to Fig. 1, a kind of on-line monitoring measuring power line conductive line connection point contact impedance provided by the utility model
Device, it is in parallel with auxiliary monitoring circuit 3 comprising main transmitting loop 1, auxiliary monitoring circuit 3 and monitoring terminal 7, main transmitting loop 1；
The main transmitting loop 1 includes main transmitting loop tie point 2, current transformer group 1, and current transformer group 1 is mounted on master
On transmitting loop 1；Auxiliary monitoring circuit 3 includes measuring resistance 4, current transformer group 26, and measuring resistance 4 is connected on auxiliary prison
In survey time road 3, current transformer group 26 is mounted on auxiliary monitoring circuit 3；Current transformer group 1 and current transformer group
26 secondary circuit is electrically connected with monitoring terminal 7；
Monitoring terminal 7 includes current sample, CPU processor, communication module；Monitoring terminal 7 has data-transformation facility, can
Carried out data transmission by wired or wireless mode.
Specifically, auxiliary monitoring circuit 3 is attempted by the both ends of main transmitting loop tie point 2.
Further, when transmission line of electricity is powered on, due to main 2 position of transmitting loop tie point depositing due to contact impedance
, pressure drop △ U will certainly be generated,
Further, since pressure drop exists, electric current I ' can be generated in auxiliary monitoring circuit 3, it is mutual that monitoring terminal 7 acquires electric current
Secondary current in sensor group 26 calculates the value of the electric current I ' in auxiliary monitoring circuit 3, and the resistance value R ' of measuring resistance 4 is
Know, the pressure drop △ U at 4 both ends of measuring resistance can be calculated according to △ U=I ' R ', this pressure drop is the pressure at 3 both ends of auxiliary monitoring circuit
Drop.
Further, the principle equal using parallel circuit voltage show that the pressure drop in auxiliary monitoring circuit 3 is exactly main transmits electricity back
The pressure drop △ U on road 1.
Further, monitoring terminal 7 acquires the secondary current in current transformer group 1, calculates in main transmitting loop 1
Electric current I can calculate contact impedance R=△ U/I of main transmitting loop tie point 2.
Further, heating power P=I of main transmitting loop tie point 2 is calculated2R。
Further, monitoring terminal 7 is passed data by built-in communication module in the way of wired or wireless
It is defeated, the contact impedance and heating power of real-time monitoring tie point.
Further, current transformer group 1 can be the current transformer of one or more different measurement ranges；Electric current is mutual
Sensor group 26 is also possible to the current transformer of one or more different measurement ranges.The reason is that when electric current in main transmitting loop 1
When different periods difference is larger, in order to ensure measurement accuracy, the combination of the current transformer using multiple and different ranges is needed, with
Ensure no matter the mutual inductor that size of current has a range to meet is met the requirements.
Further, the measuring resistance 4 in auxiliary monitoring circuit 3 can be the resistance or the resistance of multiple standards of a standard resistance value
The combination of the resistance series and parallel of value.This be in order to when single measuring resistance resistance value be unable to satisfy require when, multiple marks can be used
The mode of quasi- resistance series and parallel is met the requirements, without being especially tailored the measuring resistance met the requirements.
The ingenious place of the method is: under normal circumstances, transmission line of electricity tie point contact impedance R is generally in tens micro-ohms
Between to several hundred micro-ohms, the resistance value of the measuring resistance R ' in auxiliary monitoring circuit is according to the electric current I range of main transmitting loop and master
The normal contact impedance of transmitting loop tie point R is selected, and general R ' is in several Europe of zero point between several Europe.Therefore auxiliary monitoring
The electric current I ' generated in circuit only has several one thousandths in main transmitting loop, is greatly lowered auxiliary monitoring circuit in this way
Electric current, and then the technical requirements of device substantially reduce in auxiliary monitoring circuit, range of choice is more extensive, simultaneously as auxiliary prison
Survey time road is connected in parallel on main transmitting loop, will not be to the normal fortune of main transmitting loop even if auxiliary monitoring circuit disconnects
Row impacts.
The embodiments of the present invention is not limited by examples detailed above, and those skilled in the art should manage
It solves, the modification or equivalent replacement made under other any spiritual essence and principles without departing from the utility model should be
The substitute mode of effect, is included within the protection scope of the utility model.
Claims (5)
1. a kind of on-Line Monitor Device for measuring power line conductive line connection point contact impedance includes main transmitting loop, auxiliary prison
Survey time road and monitoring terminal, auxiliary monitoring circuit is attempted by main transmitting loop；
The main transmitting loop includes main transmitting loop tie point, current transformer group one；
The current transformer group one is mounted on main transmitting loop；
The auxiliary monitoring circuit includes measuring resistance, current transformer group two；
The measuring resistance is connected in auxiliary monitoring circuit；
The current transformer group two is mounted on auxiliary monitoring circuit；
The current transformer group one, current transformer group two secondary circuit with monitoring terminal be electrically connected；
The monitoring terminal includes current sample, CPU processor, communication module.
2. a kind of on-Line Monitor Device for measuring power line conductive line connection point contact impedance according to claim 1,
Feature are as follows: current transformer group one can be the current transformer of one or more different measurement ranges, current transformer group two
It is also possible to the current transformer of one or more different measurement ranges.
3. a kind of on-Line Monitor Device for measuring power line conductive line connection point contact impedance according to claim 1,
Feature are as follows: the measuring resistance in auxiliary monitoring circuit can be the resistance of a standard resistance value or the resistance of multiple standard resistance values
The combination of series and parallel.
4. a kind of on-Line Monitor Device for measuring power line conductive line connection point contact impedance according to claim 1,
Feature are as follows: monitoring terminal has data-transformation facility, can be carried out data transmission by wired or wireless mode.
5. a kind of on-Line Monitor Device for measuring power line conductive line connection point contact impedance according to claim 1,
Feature are as follows: monitoring terminal is powered by the induced voltage of current transformer group one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820584718.3U CN208334506U (en) | 2018-04-24 | 2018-04-24 | A kind of on-Line Monitor Device measuring power line conductive line connection point contact impedance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820584718.3U CN208334506U (en) | 2018-04-24 | 2018-04-24 | A kind of on-Line Monitor Device measuring power line conductive line connection point contact impedance |
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| Publication Number | Publication Date |
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| CN208334506U true CN208334506U (en) | 2019-01-04 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110398634A (en) * | 2018-04-24 | 2019-11-01 | 金一凡 | A kind of on-Line Monitor Device measuring power line conductive line connection point contact impedance |
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2018
- 2018-04-24 CN CN201820584718.3U patent/CN208334506U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110398634A (en) * | 2018-04-24 | 2019-11-01 | 金一凡 | A kind of on-Line Monitor Device measuring power line conductive line connection point contact impedance |
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