CN109613426A - A kind of high-voltage circuitbreaker Mume flower contact Diagnosis of Aging - Google Patents
A kind of high-voltage circuitbreaker Mume flower contact Diagnosis of Aging Download PDFInfo
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- CN109613426A CN109613426A CN201910038627.9A CN201910038627A CN109613426A CN 109613426 A CN109613426 A CN 109613426A CN 201910038627 A CN201910038627 A CN 201910038627A CN 109613426 A CN109613426 A CN 109613426A
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- mume flower
- contact
- flower contact
- temperature
- aging
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3275—Fault detection or status indication
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Gas-Insulated Switchgears (AREA)
Abstract
The invention discloses a kind of high-voltage circuitbreaker Mume flower contact Diagnosis of Aging, the temperature value and current value that the diagnostic method obtains in real time according to temperature sensor on contact and current transformer, it can get rate of temperature change at Mume flower contact, and it is realized based on rate of temperature change to Mume flower contact degree of aging real-time diagnosis, after adopting the above scheme, can determine whether degree of aging and the equipment of Mume flower contact are abnormal, provide data basis for plant maintenance, the diagnostic method is at low cost and accuracy is high in real time；Inside switch cabinet is based on being wirelessly transferred to send data effectively solving high potential isolating problem, and the wireless transmission control based on temperature data can reduce circuit board energy consumption, and it is feasible to guarantee that the diagnostic mode is stablized.
Description
Technical field
The invention belongs to high-voltage circuitbreaker components ageing diagnosing techniques fields, more particularly to a kind of temperature online that is based on to visit
The high-voltage circuitbreaker Mume flower contact Diagnosis of Aging of survey.
Background technique
High-voltage circuitbreaker directly affects the safety of operation of power networks as one of the important equipment in electric system, reliability
With stabilization.Static contact, moving contact are one group of primary elements in high-voltage circuitbreaker, when static contact and moving contact contact, therebetween
There are contact resistances, and when electric current flows through contact, due to the presence of contact resistance, electric current can cause the fever of contact, the knot of fever
Fruit may make to aoxidize at dynamic and static contact, and the oxidation of contact point will lead to metal contact surface and form metal oxidation
Object, metal oxide resistor are often higher than metal, and the function of current can generate more heats, higher heat in metal oxide
The oxidation of contact point can be further speeded up again, therefore over time, the metal oxide content of contact point is higher and higher, resistance with
Increase, calorific value is equally growing day by day.According to Joule's law, high-voltage circuitbreaker may after longtime running, because aging,
Contact resistance increases and is no longer complies with requirement.
Mume flower contact is the common contact of handcart-type switch cabinet breaker, Mume flower contact include contact, support frame, tension spring,
Spring touch finger, support frame are annular, and several contact assembly tighten spring by one on the support frame and constitute annular solid.Mume flower contact
It is typically mounted at moving contact contact arm end, the contact is when flowing through Short-Circuit High Current, due to the presence of contact resistance, contact portion
Temperature can steeply rise, within several seconds time, contact may will occur because of overheat local melting and welding
Situation.In addition, handcart type high voltage switch cabinet is in During Process of Long-term Operation, the Mume flower contact and cabinet body of vacuum circuit breaker in switchgear
Static contact junction can generate heat because aging or contact resistance are excessive, if calorific value is excessive, may directly affect the peace of equipment
Full stable operation, this phenomenon have become the FAQs in switchgear use, and if be not controlled, it is continuous with overheat
Accumulation, in some instances it may even be possible to cause fire or large area blackout, it is therefore desirable to check Mume flower contact and static contact contact point in time
Degree of aging determine whether to handle high-voltage circuitbreaker.Due to the airtightness of switch cabinet, Mume flower contact contact
The degree of aging detection of point is more not easy, moreover, contact point overheat is the process of a continuous development, the variation of contact resistance is
Slowly carry out, according to existing regular off-line maintenance, big, costly deficiency that there are blindness, and checking process will affect
The normal operation of electric system, high-voltage circuitbreaker operation actual conditions do not allow the size by directly measuring contact resistance come
Identify these gradual failures, existing Mume flower contact Ageing Diagnosis mode needs to be improved.
Summary of the invention
It is a kind of based on temperature change technical problem to be solved by the present invention lies in providing, plum blossom can be easily obtained in real time
The high-voltage circuitbreaker Mume flower contact Diagnosis of Aging of contact ageing state.
In order to solve the above technical problems, the technical solution of the invention is as follows:
A kind of high-voltage circuitbreaker Mume flower contact Diagnosis of Aging, it is characterised in that the following steps are included:
Step 1 is equipped with Mume flower contact in the contact arm end of High Voltage Circuit Breaker Contacts, and the contact arm is close to Mume flower contact
Part is equipped with temperature sensor, and the temperature sensor obtains temperature signal when Mume flower contact work；
Step 2, current transformer is socketed on the contact arm, and the current transformer obtains current signal in contact arm；
Step 3, determines detection cycle, and timing acquisition flows through the current value of the contact arm
It=I (t), t=1,2,3,4 ...
And the temperature value of the moment corresponding Mume flower contact
Tt=T (t), t=1,2,3,4 ...；
Step 4: from array TtAnd ItThe middle array T obtained for analyzing datanAnd In, wherein
TnAnd InFor the corresponding temperature value of synchronization and current value；
Step 5: adjacent two groups of current values and corresponding temperature value are taken, the rate of temperature change of Mume flower contact is acquired
Step 6: by the judgement to rate of temperature change, it is whether serious that breaker Mume flower contact aging conditions are diagnosed.
Preferably, being additionally provided with after the step 6:
Step 7 compares plum blossom touching when the non-rate of temperature change for measuring Mume flower contact for the first time measures for the first time with high-tension switch cabinet
The rate of temperature change of head obtains the two difference
Whether serious step 8 diagnoses breaker Mume flower contact aging conditions by the judgement to rate of temperature change difference.
Preferably, the temperature sensor uses NTC thermistor.
Power supply is taken with CT preferably, being also equipped with ZigBee chip on the contact arm, the electricity equipped with the ZigBee chip
Microprocessor is integrated on the plate of road, circuit board and the CT take power supply to be packaged into integral structure by casting epoxy resin,
The integral structure connects the temperature sensor and the current transformer by cable signal.
Preferably, being equipped on the switchgear of the high-voltage circuitbreaker equipped with coordinator, the ZigBee chip passes through institute
Coordinator is stated to connect with host computer server signal.
Preferably, the integral structure is cyclic structure, the integral structure is sleeved and fixed on the contact arm of contact
And be coaxially close together with the current transformer, the integral structure inner ring is equipped with for temperature sensor mounted
Notch.
Preferably, being equipped with comparison circuit on the circuit board simultaneously, the output of the comparison circuit is connect with transmitting module,
The comparison circuit is depended on whether transmitting module starts exports result.
Preferably, the input voltage of the comparison circuit depends on temperature sensor peripheral temperature.
After adopting the above scheme, since the present invention can obtain the current value and temperature of inside switch cabinet breaker contact point in real time
Value, therefore can determine whether the degree of aging of Mume flower contact and equipment are abnormal, provide data basis for plant maintenance, this is examined in real time
Disconnected method does not influence electric system and operates normally and be not necessarily to disassemble equipment, and implementation cost is lower, simultaneously as detection knot
Fruit is to generate exception based on failure, therefore accuracy in detection wants high compared with traditional approach；Inside switch cabinet is based on wireless transmission pair
Data, which send, can effectively solve high potential isolating problem, and the wireless transmission control based on temperature data can reduce circuit board energy
Consumption, it is feasible to guarantee that the diagnostic mode is stablized.
Detailed description of the invention
Fig. 1 is sensing arrangement combination diagram on Mume flower contact and contact arm；
Fig. 2 is integral structure schematic diagram of the present invention.
Label declaration:
Contact arm -1, Mume flower contact -2, temperature sensor -3, current transformer -4, integral structure -5, notch -6.
Specific embodiment
The invention will be further described in the following with reference to the drawings and specific embodiments.
Disclosed is a kind of high-voltage circuitbreaker Mume flower contact Diagnosis of Aging, which is based primarily upon
The Mume flower contact of aging will generate this principle of more heats, pass through the online prison to electric current in Mume flower contact temperature and contact arm
Survey, real-time diagnosis Mume flower contact whether aging.
The first step needs that the sensing knot for obtaining temperature data and current data is arranged on the high-voltage circuitbreaker of switchgear
Structure.Specifically, Mume flower contact is installed in the contact arm end of moving contact in high voltage breaker first in switchgear, Mume flower contact with it is quiet
Why contact, contact point select Mume flower contact to be because when contact point generates heat by electric current there are contact resistance
When amount, static contact expanded by heating, and Mume flower contact tightens spring by outside, it will be to the static contact for being in relative contact location
A reaction force is formed, in this way with the raising of running temperature, the contact force of Mume flower contact fingertip and static contact is bigger, contact
Will be relatively reliable, contact resistance is reduced to a certain extent, is conducive to the longtime running of equipment.As Figure 1-Figure 2, then
In moving contact contact arm 1 close to 2 part mounting temperature sensor 3 of Mume flower contact, temperature sensor 3 can use NTC thermistor,
Temperature sensor 3 obtains accurate temperature signal when Mume flower contact 2 works；In terms of current data, it is socketed on moving contact contact arm 1
Current transformer 4, current transformer 4 obtain current signal in contact arm 1.It is also equipped with ZigBee chip on contact arm 1 and CT takes electricity electricity
Source is integrated with microprocessor on the circuit board equipped with ZigBee chip, and circuit board and CT take power supply to pass through casting epoxy resin
It is packaged into integral structure 5, integral structure 5 is cyclic structure in the present embodiment, is equally sleeved and fixed the contact arm 1 in contact
It above and with above-mentioned current transformer 4 is coaxially close together, which is equipped with notch 6, temperature sensor 3
It can be mounted on the notch 6, integral structure 5 connects temperature sensor 3 by the high-temperature electric cable signals through insulation processing
With current transformer 4.Processes temperature signal circuit and current signal processing circuit are also integrated on circuit board, due to using
NTC thermistor, which understands the variation because of environment temperature and output resistance changing value, circuit board can obtain
Current variation value corresponding with increased resistance value, and change information formation temperature is changed by number by processes temperature signal circuit
Information is sent.Current transformer is then based on curent change in moving contact and exports corresponding current variation value, and circuit board obtains
After the circuit values and curent change digital information in moving contact contact arm is formed by current signal processing circuit to be sent, it is above
Current transformer adopt value, convert analog signals into digital signal, to take power supply physical circuit be the prior art and non-to CT
Case emphasis does not do expand explanation herein.
Second step is realized and collects above two sensing arrangement acquisition data.Due to the closed structure of switchgear, originally
The data that invention design sensing arrangement obtains will collect report based on wireless transmission.The switchgear of high-voltage circuitbreaker is installed
Upper that coordinator is housed, coordinator is mounted on door of switch cabinet comprising has multiple peripheral interfaces, main realize is set up and safeguarded
ZigBee-network.ZigBee chip in switchgear on each moving contact contact arm is connected by coordinator and host computer server signal
It connecing, temperature change digital signal and curent change digital signal are reported to coordinator by ZigBee-network by ZigBee chip,
Coordinator timesharing receives the data that each phase contact contact point is sent, and is passed through according to the data that node ID obtains different contacts
Network connection is reported to host computer server, and the signal transmission based on ZigBee-network solves high potential isolating problem, low function
The wireless transport module for consuming design has well solved Mume flower contact temperature measurement problem, has carried out for Mume flower contact aging conditions
Judgement provides data basis, meets scene operation needs, has practical engineering application value.
Third step, temperature Value Data of the upper server based on acquisition and electric current Value Data to Mume flower contact whether aging into
Row diagnosis.Specifically, first determining the detection cycle of above two sensing arrangement, detection cycle is determined according to actual needs,
A data can be generally obtained within several seconds, a data can be acquired in the present embodiment with 5s, timing acquisition stream is controlled by circuit board
Current value through contact arm
It=I (t), t=1,2,3,4 ...
And the temperature value of the moment corresponding Mume flower contact
Tt=T (t), t=1,2,3,4 ...；
Wherein, acquisition data are T when the unit of t is a detection cycle, i.e. 5s1, acquisition data are T when 10s2, with such
It pushes away.
Part typical data in above-mentioned data is sent to coordinator by ZigBee chip by subsequent circuit board, then by assisting
Device is adjusted to be pooled to host computer server.Or the data of all acquisitions can also be sent to coordinator, device to be coordinated is by data
After being pooled to host computer server, host computer server acquisition unit score from the data of acquisition to all data or according to rule
It is used to analyze according to as typical data.From array TtAnd ItThe middle array T obtained for analyzing datanAnd In, i.e. typical data,
Wherein,
TnAnd InFor the corresponding temperature value of synchronization and current value.
The decision rule of typical data can be Fixed Time Interval, and periodically collecting sample data carry out from batch data
Analysis, is also possible to set temperature threshold value, when the temperature value of acquisition is higher than temperature threshold, the temperature value and corresponding time point
Current value is denoted as an Effective Numerical.
The array T of host computer server acquisition typical datanAnd InAfterwards,
Adjacent two groups of current values and corresponding temperature value are taken, the rate of temperature change of Mume flower contact is acquired
By the judgement to rate of temperature change, determine whether breaker contact point aging conditions are serious, for example, can be upper
Set temperature change rate threshold value on machine server then diagnoses Mume flower contact aging once rate of temperature change is more than change rate threshold value
Seriously, since the judgement to rate of temperature change is carried out on host computer server, threshold value can according to practical application into
The setting of pedestrian's work.Wherein, TnFor the temperature value of single measurement, InFor the current value (three-phase current virtual value) of single acquisition, and Tn
And InFor temperature value and current value that synchronization obtains respectively, Δ T is temperature gap, eliminates the influence of environment temperature, Δ I
For current differential, the influence of different load electric current is eliminated, the situation of change of rate of temperature change is only with Mume flower contact contact at this time
The contact resistance at place is related, and rate of temperature change indicates that more greatly the contact resistance of contact is bigger.In fact, rate of temperature change is bigger
Not representing all is caused by Mume flower contact aging, and the abrasion of Mume flower contact, spring loosen or shelf depreciation melting welding may cause
Rate of temperature change increases, and above situation is required to handle in time to guarantee equipment stable operation to debug.
Further, host computer server can carry out rate of temperature change by set temperature change rate difference threshold real
When be monitored online.Due to different breakers, its possible running environment is also different, directlys adopt rate of temperature change sometimes not
Can more get information about equipment whether failure, accordingly it is also possible to select rate of temperature change variable quantity to determine whether equipment old
Change serious or failure.In the present embodiment, the non-rate of temperature change for measuring Mume flower contact for the first time can be compared and high-tension switch cabinet is first
The rate of temperature change of Mume flower contact when secondary measurement obtains the two difference
The difference threshold that the wider rate of temperature change difference of applicability is set on host computer server, works as rate of temperature change
Difference DELTA TRWhen greater than difference threshold, then it is serious to diagnose Mume flower contact aging.
Part typical data is only sent to by coordinator by ZigBee chip for foregoing circuit plate, specifically, circuit
Plate because long-term continues that a large amount of electric energy will be consumed to coordinator transmission data, can initialization circuit plate base in order to reduce circuit board energy consumption
Data are sent to coordinator in temperature event.Specifically, comparison circuit is additionally provided on circuit board, the output and transmitting of comparison circuit
Module connection, transmitting module, that is, above-mentioned ZigBee chip connecting with coordinator signal in the present embodiment, comparison circuit can will be with
The increased resistance value of temperature change is converted into voltage signal.Comparison circuit is depended on whether transmitting module starts to export as a result, i.e.
Temperature sensor can be by the resistance variations numerical value varied with temperature by emitting mould on high temperature wire and comparison circuit and circuit board
Block connection.If presetting contrast potential signal represents 100 DEG C of temperature, i.e. the turnover voltage of comparator represents 100 DEG C of temperature,
When temperature sensor peripheral temperature is greater than 100 DEG C, the input voltage of comparator is lower than turnover voltage, the at this time output of comparator
It is got higher by low, i.e. the input of transmitting module is high level, and transmitting module is in running order, by processes temperature signal processing of circuit
Data launch.And when temperature sensor peripheral temperature is less than 100 DEG C, the output of comparator is lower by height, that is, is emitted
The input of module is low level, and transmitting module stops working, and reduces circuit board energy consumption.Comparison circuit more only will touching by temperature
The resistance value for having sent out temperature event is sent, therefore being converted into voltage signal is converted after discretization, obtained place
Discrete data after reason is sent to host computer server, by host computer server according to above-mentioned steps to Mume flower contact aging
Degree carries out real-time diagnosis.
The above described is only a preferred embodiment of the present invention, be not intended to limit the scope of the present invention,
Therefore the changes or modifications that claim under this invention and specification are done in every case, it all should belong to the range that the invention patent covers
Within.
Claims (8)
1. a kind of high-voltage circuitbreaker Mume flower contact Diagnosis of Aging, it is characterised in that the following steps are included:
Step 1 is equipped with Mume flower contact in the contact arm end of High Voltage Circuit Breaker Contacts, and the contact arm is close to Mume flower contact part
Temperature sensor is installed, the temperature sensor obtains temperature signal when Mume flower contact work；
Step 2, current transformer is socketed on the contact arm, and the current transformer obtains current signal in contact arm；
Step 3, determines detection cycle, and timing acquisition flows through the current value of the contact arm
It=I (t), t=1,2,3,4 ...
And the temperature value of the moment corresponding Mume flower contact
Tt=T (t), t=1,2,3,4 ...；
Step 4: from array TtAnd ItThe middle array T obtained for analyzing datanAnd In, wherein
TnAnd InFor the corresponding temperature value of synchronization and current value；
Step 5: adjacent two groups of current values and corresponding temperature value are taken, the rate of temperature change of Mume flower contact is acquired
Step 6: by the judgement to rate of temperature change, it is whether serious that breaker Mume flower contact aging conditions are diagnosed.
2. a kind of high-voltage circuitbreaker Mume flower contact Diagnosis of Aging according to claim 1, it is characterised in that: the step
It is additionally provided with after rapid six,
Step 7 compares Mume flower contact when the non-rate of temperature change for measuring Mume flower contact for the first time measures for the first time with high-tension switch cabinet
Rate of temperature change obtains the two difference
Whether serious step 8 diagnoses breaker Mume flower contact aging conditions by the judgement to rate of temperature change difference.
3. a kind of high-voltage circuitbreaker Mume flower contact Diagnosis of Aging according to claim 1, it is characterised in that: the temperature
It spends sensor and uses NTC thermistor.
4. a kind of high-voltage circuitbreaker Mume flower contact Diagnosis of Aging according to claim 1, it is characterised in that: the touching
It is also equipped with ZigBee chip on arm and CT takes power supply, is integrated with microprocessor on the circuit board equipped with the ZigBee chip,
The circuit board and the CT take power supply to be packaged into integral structure by casting epoxy resin, and the integral structure passes through
Cable signal connects the temperature sensor and the current transformer.
5. a kind of high-voltage circuitbreaker Mume flower contact Diagnosis of Aging according to claim 4, it is characterised in that: be equipped with
Coordinator is housed, the ZigBee chip passes through the coordinator and host computer server on the switchgear of the high-voltage circuitbreaker
Signal connection.
6. a kind of high-voltage circuitbreaker Mume flower contact Diagnosis of Aging according to claim 4, it is characterised in that: described one
Body formula structure is cyclic structure, and the integral structure is sleeved and fixed on the contact arm of contact and coaxial with the current transformer
It is close together, the integral structure inner ring, which is equipped with, is used for temperature sensor mounted notch.
7. a kind of high-voltage circuitbreaker Mume flower contact Diagnosis of Aging according to claim 4, it is characterised in that: the electricity
Comparison circuit is equipped on the plate of road simultaneously, the output of the comparison circuit is connect with transmitting module, and transmitting module depends on whether starting
Result is exported in the comparison circuit.
8. a kind of high-voltage circuitbreaker Mume flower contact Diagnosis of Aging according to claim 7, it is characterised in that: the ratio
Input voltage compared with circuit depends on temperature sensor peripheral temperature.
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| CN201910038627.9A CN109613426B (en) | 2019-01-16 | 2019-01-16 | Aging diagnosis method for plum blossom contact of high-voltage circuit breaker |
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| CN201910038627.9A CN109613426B (en) | 2019-01-16 | 2019-01-16 | Aging diagnosis method for plum blossom contact of high-voltage circuit breaker |
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| CN112904193A (en) * | 2021-01-22 | 2021-06-04 | 国网黑龙江省电力有限公司大庆供电公司 | High tension switchgear contact temperature fault monitoring system |
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| Publication number | Publication date |
|---|---|
| CN109613426B (en) | 2021-12-10 |
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