CN109919390A - Predict the method and apparatus of the temperature rise of the contact point of power equipment - Google Patents
Predict the method and apparatus of the temperature rise of the contact point of power equipment Download PDFInfo
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- CN109919390A CN109919390A CN201910199960.8A CN201910199960A CN109919390A CN 109919390 A CN109919390 A CN 109919390A CN 201910199960 A CN201910199960 A CN 201910199960A CN 109919390 A CN109919390 A CN 109919390A
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- sampling period
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Abstract
The present invention relates to the method and apparatus of the temperature rise of the contact point of prediction power equipment, method include: obtain an initial sampling period when starting the first temperature rise of a contact point of power equipment and at the end of the second temperature rise, contact point is the contact position of at least two components of power equipment；Obtain the time constant of the one order inertia system an of power equipment；According to the first temperature rise, the second temperature rise and time constant, the third temperature rise of contact point at the end of predicting the X sampling period, X=[LN], wherein L is positive integer and L >=3, s are a sampling period, N*s=time constant.According to the present invention, temperature rise when being started by obtaining a sampling period at the end of, temperature rise after preset time period is predicted, the temperature rise after preset time period can be quickly determined in this way, such as the value after temperature rise stabilization, and then subsequent some operations are executed by the temperature rise of the prediction, such as judge whether contact point breaks down.
Description
Technical field
The present invention relates to field of power systems, the especially method and apparatus of the temperature rise of the contact point of prediction power equipment.
Background technique
Switchgear is the important transmission & distribution electric installation in electric system, it is therefore desirable to which the operating condition of switchgear is carried out
Real time monitoring.Switchgear usually has various contact points, such as position, copper bar connection outside that Mume flower contact is contacted with static contact are set
Standby position etc., when electric current flows through contact point, contact point can generate heat, therefore the maximum that contact point is defined in national standard permits
Perhaps heating temperature and maximum allowable temperature rise.Due to factors such as manufacture, installation, transport or longtime runnings, contact point may be touched
The problems such as point oxidation, deformation loosen, when there are these problems, the temperature rise of contact point can exceed defined range, cause to switch
The damage of cabinet.In order to avoid these problems, it usually needs the temperature rise of butt contact is monitored on-line.Specifically, when discovery is real
Border temperature rise is more than maximum allowable temperature rise, it is determined that is broken down contact point.Here temperature rise refers to the temperature and ring of contact point
Difference between the temperature of border, environment temperature are generally obtained by the temperature probe being placed in environment.
Since temperature rise is by longlyer just gradually stable for a period of time, if just detecting contact point after temperature rise is stablized
It breaks down, switchgear has worked a period of time at this time, this will affect the service life of switchgear.
Summary of the invention
In view of this, the invention proposes the methods of the temperature rise of the contact point of prediction power equipment, comprising:
First temperature rise of one contact point of one power equipment and knot when one initial sampling period of acquisition starts
The second temperature rise when beam, the contact point are the contact position of at least two components of the power equipment；
Obtain the time constant of the one order inertia system an of power equipment；
According to first temperature rise, second temperature rise and the time constant, predict that the X sampling period terminates
The third temperature rise of the contact point Shi Suoshu, X=[LN], wherein L is positive integer and L >=3, s are a sampling period, N*s=time
Constant.
According to the present invention, temperature when being started by obtaining an initial sampling period at the end of, to X sampling week
Temperature after phase is predicted, can quickly determine the corresponding stable temperature rise in contact point, and then the temperature for passing through the prediction in this way
It rises and executes subsequent some operations, such as judge whether contact point breaks down.
According to method as described above, optionally, according to first temperature rise, second temperature rise and the X, in advance
The third temperature rise for surveying the contact point after the X sampling period includes:
According to the following formula, the third temperature rise T of the contact point is determined:
T=(Δ Kn-ΔKn-1*e-1/N)/(1-e-1/N)
Wherein, Δ Kn-1For first temperature rise, Δ KnFor second temperature rise.
According to method as described above, optionally, the third temperature of contact point at the end of predicting the X sampling period
After rising, further includes:
Obtain the primary current of the power equipment in the initial sampling period；
According to the third temperature rise and the primary current, determine whether the contact point breaks down.
By predicting the temperature rise of the contact point of power equipment, then determine by the temperature rise contact resistance and thermal resistance of contact point
Product value, and then determine whether contact point breaks down by the product value.In such manner, it is possible to after power equipment start-up operation
It determines whether contact point breaks down in the shorter time, and then guarantees service life and the relevant staff of power equipment
Safety.
According to method as described above, optionally, according to the third temperature rise and the primary current, the contact is determined
Whether point, which breaks down, includes:
According to the following formula, the contact resistance of the contact point and the product of thermal resistance are determined:
T=Iw2*R*Rθ
Wherein, Iw indicates that the primary current, R indicate that the contact resistance of the contact point, R θ indicate the contact point
Thermal resistance；
If the contact resistance of the contact point and the product of thermal resistance are greater than a preset threshold, it is determined that the contact is pointed out
Existing failure.
What the product of contact resistance and thermal resistance reflected is the connection status of power equipment system itself, unrelated with input,
It should keep stable.Determine whether contact point breaks down by the product of the contact resistance of contact point and thermal resistance, accuracy
Preferably.
According to method as described above, optionally, the primary current is primary current in the initial sampling period
Average value.Since primary current may be real-time change, using the average value conduct of primary current in the entire sampling period
The primary current of power equipment in the period can obtain the value of accurate primary current as far as possible.
The present invention also provides the devices of the temperature rise of the contact point of prediction power equipment, comprising:
One first acquisition unit, for obtain an initial sampling period start when power equipment a contact point
The first temperature rise and at the end of the second temperature rise, the contact point be the power equipment at least two components contact position
It sets；
One second acquisition unit, the time constant of the one order inertia system for obtaining a power equipment；One pre-
Unit is surveyed, for predicting the X sampling period according to first temperature rise, second temperature rise and the time constant
At the end of the contact point third temperature rise, X=[LN], wherein L is positive integer and L >=3, s are a sampling period, N*s=
Time constant.
According to the present invention, temperature when being started by obtaining a sampling period at the end of, after preset time period
Temperature predicted, can quickly determine that the temperature rise after X period, the temperature rise after the X period can be counted as surely in this way
Temperature rise after fixed, and then subsequent some operations are executed by the temperature rise of the prediction, such as judge whether contact point breaks down.
According to device as described above, optionally, the predicting unit is specifically used for:
According to the following formula, the third temperature rise T of the contact point is determined:
T=(Δ Kn-ΔKn-1*e-1/N)/(1-e-1/N)
Wherein, Δ Kn-1For first temperature rise, Δ KnFor second temperature rise.
According to device as described above, optionally, further includes:
One third acquiring unit, for obtaining the primary electricity of the power equipment in the initial sampling period
Stream；
One determination unit, for determining whether the contact point goes out according to the third temperature rise and the primary current
Existing failure.
By predicting the temperature rise of the contact point of power equipment, then determine by the temperature rise contact resistance and thermal resistance of contact point
Product value, and then determine whether contact point breaks down by the product value.In such manner, it is possible to after power equipment start-up operation
It determines whether contact point breaks down in the shorter time, and then guarantees service life and the relevant staff of power equipment
Safety.
According to device as described above, optionally, the determination unit is specifically used for:
According to the following formula, the contact resistance of the contact point and the product of thermal resistance are determined:
T=Iw2*R*Rθ
Wherein, Iw indicates that the primary current, R indicate that the contact resistance of the contact point, R θ indicate the contact point
Thermal resistance；
If the contact resistance of the contact point and the product of thermal resistance are greater than a preset threshold, it is determined that the contact is pointed out
Existing failure.
What the product of contact resistance and thermal resistance reflected is the connection status of power equipment system itself, unrelated with input,
It should keep stable.Determine whether contact point breaks down by the product of the contact resistance of contact point and thermal resistance, accuracy
Preferably.
According to device as described above, optionally, the primary current is primary current in the initial sampling period
Average value.Since primary current may be real-time change, using the average value conduct of primary current in the entire sampling period
The primary current of power equipment in the period can obtain the value of accurate primary current as far as possible.
The present invention provides the device of the temperature rise of the contact point of a prediction power equipment again, comprising:
At least one processor, for storing instruction；
At least one processor is used for the aforementioned described in any item predictions of instruction execution stored according to the memory
The method of the temperature rise of the contact point of power equipment.
The present invention provides a readable storage medium storing program for executing again, and machine readable instructions are stored in the readable storage medium storing program for executing, described
For machine readable instructions when being executed by a machine, the machine executes the contact of aforementioned described in any item prediction power equipments
The method of the temperature rise of point.
Detailed description of the invention
Below will detailed description of the present invention preferred embodiment by referring to accompanying drawing, make those skilled in the art more
Clear above and other feature and advantage of the invention, in attached drawing:
Fig. 1 is the flow diagram according to the method for the temperature rise of the contact point of the monitoring switch cabinet of one embodiment of the invention.
Fig. 2 is to be illustrated according to the process of the method for the temperature rise of the contact point of the monitoring switch cabinet of another embodiment of the present invention
Figure.
Fig. 3 is the structural representation according to the device of the temperature rise of the contact point of the monitoring switch cabinet of yet another embodiment of the invention
Figure.
Fig. 4 is the structural representation according to the device of the temperature rise of the contact point of the monitoring switch cabinet of further embodiment of this invention
Figure.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, by the following examples to of the invention further detailed
It describes in detail bright.
Power equipment of the invention specifically can be switchgear or transformer, and can also be other certainly can use this hair
The equipment of bright method.The contact point of power equipment can be the contact position at two positions.Come as an example with switchgear below
It is specifically described.
Inventors have found that the load of switchgear is related with primary current, load is bigger, and primary current is bigger, and load is smaller,
Primary current is smaller.In addition, primary current affects the temperature rise of each contact point.With the accumulation of primary current, temperature rise can gradually
Rise, finally maintains a fixed value.The process can continue longer time, at least 8-9 hour.That is current point in time
Temperature rise thus before 8-9 hour of university current accumulation decision.On the other hand, i.e., the primary current pair before 8-9 hour
The influence of the current temperature rise of contact point can be ignored.If just determined according to the temperature rise after stabilization after temperature rise is stablized
Whether the contact point of switchgear breaks down out, then switchgear may nonserviceable lower work a period of time, this meeting
Influence the service life of switchgear.
Embodiment one
The present embodiment provides the method for the temperature rise of the contact point of monitoring switch cabinet, executing subject is the contact of monitoring switch cabinet
The device of the temperature rise of point.The device can integrate in temperature transducer, computer or relay, can also be separately provided,
This is repeated no more.
As shown in Figure 1, for according to the flow diagram of the method for the temperature rise of the contact point of the monitoring switch cabinet of the present embodiment.
This method comprises:
Step 101, the first temperature rise of one contact point of one switchgear when one initial sampling period of acquisition starts
The second temperature rise at the end of and, contact point are the contact position of at least two components of switchgear.
The initial sampling period, which refers to, needs to obtain the sampling period corresponding to the first temperature rise and the second temperature rise, this is initial
The 1st sampling period that sampling period is not necessarily really sampled.The duration in the sampling period can be according to practical need
It sets, for example, 20-30 minutes.First temperature rise and the second temperature rise can be obtained by temperature sensor, the temperature sensing
Device may be mounted at the position at contact point or near contact point.The contact point of switchgear is the contact position of at least two components
It sets, such as moving contact and contact position, copper bar and the contact position of casing of static contact etc., i.e., contact point can be switchgear
Contact either bus contact point, details are not described herein.
The temperature rise of contact point refers to the difference between contact point current temperature and environment temperature.
Step 102, the time constant of the one order inertia system an of switchgear is obtained.
Here one order inertia system refers to the response relation of primary current and temperature rise.Under normal circumstances, if primary electricity
Flow constant, when the sampling period reaches 3-5 times of time constant, which should almost reach to a stationary value.It is of course also possible to
The primary current for sampling all sampling periods within 8-9 hour, specifically can be determine according to actual needs.The single order is used
The time constant of property system can be known in advance according to the parameter of system, for example, 100 minutes.
The step 102 and step 101 can be executed successively, also be may be performed simultaneously without execution sequence.
Step 103, according to the first temperature rise, the second temperature rise and time constant, contact point at the end of predicting the X sampling period
Third temperature rise, X=[LN], wherein L is positive integer and L >=3, s are a sampling period, N*s=time constant.
Since 3-5 times of time constant temperature rise can reach certain stationary value under normal circumstances, optionally, L's is taken
Value range is further 3-5.[] indicates to be rounded, and can round up or be rounded downwards according to actual needs.One sampling period
What is indicated is a sampling period corresponding time span, certainly the time constant in namely initial sampling period.Practical fortune
In, can be determined by setting s the value of N as positive integer, such as time constant be 100 minutes, s can be 25 minutes, this
Sample N is exactly 4.Assuming that L=5, X are exactly 20, it is equivalent in this way 500 minutes, i.e., more than 8 hour.
In the present embodiment, the first pre- thermometric at the end of next sampling can be determined according to the first temperature rise and the second temperature rise
It rises, the second prediction temperature rise at the end of determining next one sampling period then according to the second temperature rise and the first prediction temperature rise, so
Temperature rise is predicted according to the third at the end of the first prediction temperature rise and the second prediction temperature rise again the latter sampling period of determination afterwards,
And so on, at the end of determining the X sampling period contact point third temperature rise.Specifically can according to the first temperature rise and
The heating trend of second temperature rise determines the heating trend in next sampling period.The third temperature rise is considered as to be predicted
The corresponding stable temperature rise in contact point.
For concrete example, the third temperature rise T of contact point can be determined according to the following formula:
T=(Δ Kn-ΔKn-1*e-1/N)/(1-e-1/N) wherein, Δ Kn-1For the first temperature rise, Δ KnFor the second temperature rise.
The present invention can repeat step 101 to step 103.Such as step 101 was repeated to step every 1 minute
103, it can predict the temperature rise after corresponding preset time period, always in this way to realize the real-time of the temperature rise to the contact point of switchgear
Monitoring.More specifically, in sampling process, step 101 is repeated since a sampling period to step 103, n represents
N sampling period, Δ KnFor the corresponding temperature rise of n-th of sampling period, Δ Kn-1For the corresponding temperature rise of (n-1)th sampling period, appoint
One (n-1)th sampling period of meaning is considered as the initial sampling period of the invention, and then executes subsequent step, to hold
The temperature rise of the contact point of continuous preset switches cabinet, and then its temperature rise is monitored.
There are also a lot of other modes by the present invention come the prediction temperature rise at the end of determining each sampling period, and details are not described herein.
According to the present invention, temperature rise when being started by obtaining an initial sampling period at the end of, to X sampling week
Temperature after phase is predicted, can quickly determine the corresponding stable temperature rise in contact point, and then the temperature for passing through the prediction in this way
It rises and executes subsequent some operations, such as judge whether contact point breaks down.
Embodiment two
The present embodiment does further supplementary explanation to the method for the temperature rise of the contact point of the monitoring switch cabinet of embodiment one.Such as
Shown in Fig. 2, for according to the flow diagram of the method for the temperature rise of the contact point of the present embodiment monitoring switch cabinet.This method comprises:
Step 201, the first temperature rise of one contact point of one switchgear when one initial sampling period of acquisition starts
The second temperature rise at the end of and, contact point are the contact position of at least two components of switchgear.
The step and step 101 are consistent, and details are not described herein.
Step 202, the time constant of the one order inertia system an of switchgear is obtained.
The step and step 102 are consistent, and details are not described herein.
Step 203, according to the first temperature rise, the second temperature rise and time constant, contact point at the end of predicting the X sampling period
Third temperature rise, X=[LN], wherein L is positive integer and L >=3, s are a sampling period, N*s=time constant.
The step and step 103 are consistent, and details are not described herein.
Step 204, the primary current of the switchgear in the initial sampling period is obtained.
The primary current of the present embodiment refers on high-tension side electric current.It, can be every one within the initial sampling period
Period acquires electric current again and again, such as the initial sampling period is 30 minutes, can be electric again and again every acquisition in 1 minute
Stream, and using collected all primary currents average value as the primary current of the switchgear in the initial sampling period.
Since primary current may be real-time change, average value using primary current in the entire sampling period in the period as opening
The primary current for closing cabinet, can obtain the value of accurate primary current as far as possible.It is of course also possible to which the initial sampling period is started
When primary current or at the end of primary current of the primary current as switchgear, can specifically select according to actual needs
It selects, is not repeating herein.
Step 205, according to third temperature rise and primary current, determine whether contact point breaks down.
For example, according to the following formula, the contact resistance of contact point and the product of thermal resistance are determined:
T=Iw2*R*Rθ
Wherein, Iw indicates that primary current, R indicate that the contact resistance of contact point, R θ indicate the thermal resistance of contact point.
Specifically, for example, if target component is greater than contact resistance and thermal resistance of the contact point under normal contact condition
Product and the sum of a default error, i.e. target component=R*R θ+r, wherein R is contact resistance, and R θ is thermal resistance, and r is default
Error then illustrates that the target component is excessive, and contact point is broken down.Here r can be set according to actual needs, herein no longer
It repeats.
What the product of contact resistance and thermal resistance reflected is the connection status of switch cabinet system itself, unrelated with input, is answered
The holding is stablized.Determine whether contact point breaks down by the product of the contact resistance of contact point and thermal resistance, accuracy compared with
It is good.
Inventors have found that the load of switchgear is related with primary current, load is bigger, and primary current is bigger, and load is smaller,
Primary current is smaller.In addition, primary current affects the temperature rise of each contact point.Here temperature rise refer to the temperature of contact point with
Difference between environment temperature.For example, if the temperature of contact point is 35 DEG C, environment temperature is 25 DEG C, then temperature rise is 10 DEG C.
If primary current remains unchanged, after about 8-9 hour, temperature rise can stablize in a fixed value.In simple terms, that is, it contacts
The accumulation of electrical current of about 8-9 determines before the current temperature rise of point thus.On the other hand, i.e., the primary current pair before 8-9 hour
The influence of the current temperature rise of contact point can be ignored.Accordingly, it is considered to the temperature of primary current and contact point in 8-9 hour
The relationship risen, can not only make result accurate, and can reduce calculation amount.In addition, when there is poor contact, loosening in contact point
Phenomena such as, the contact resistance of contact point will change, and become larger, generally far more than normal range (NR).Correspondingly, temperature rise
It can be larger.Based on the above situation, it can determine whether contact point goes out by the thermal resistance and the amplitude of variation of resistance for determining contact point
Existing failure.
According to the present embodiment, connecing for contact point is determined by the temperature rise of the contact point of monitoring switch cabinet, then by the temperature rise
The product value of electric shock resistance and thermal resistance, and then determine whether contact point breaks down by the product value.In such manner, it is possible in switchgear
It determines whether contact point breaks down in the shorter time after start-up operation, and then guarantees service life and the correlation work of switchgear
Make the safety of personnel.
Embodiment three
The present embodiment provides the device of the temperature rise of the contact point of monitoring switch cabinet, the prediction for being used to execute embodiment one is opened
The method for closing the temperature rise of the contact point of cabinet.
As shown in figure 3, for according to the structural schematic diagram of the device of the temperature rise of the contact point of the monitoring switch cabinet of the present embodiment.
The device includes 301, second acquisition units 302 of a first acquisition unit and a predicting unit 303.
Wherein, one contact of switchgear when first acquisition unit 301 starts for obtaining an initial sampling period
Point the first temperature rise and at the end of the second temperature rise, contact point be switchgear at least two components contact position；First
Determination unit 302 is used to obtain the time constant of the one order inertia system an of switchgear；Predicting unit 303 is used for according to first
Temperature rise, the second temperature rise and time constant, the third temperature rise of contact point, X=[LN], wherein L at the end of predicting the X sampling period
For positive integer and L >=3, s are a sampling period, N*s=time constant.
Optionally, predicting unit 303 is specifically used for:
According to the following formula, the third temperature rise T of contact point is determined:
T=(Δ Kn-ΔKn-1*e-1/N)/(1-e-1/N)
Wherein, Δ Kn-1For the first temperature rise, Δ KnFor the second temperature rise.
The working method of each unit of the present embodiment is identical as previous embodiment, and details are not described herein.
According to the present invention, temperature rise when being started by obtaining a sampling period at the end of, after preset time period
Temperature rise predicted, can quickly determine the temperature rise after preset time period in this way, for example, temperature rise stablize after value, and then pass through
The temperature rise of the prediction executes subsequent some operations, such as judges whether contact point breaks down.
Example IV
The present embodiment does further supplementary explanation to the device of the temperature rise of the contact point of the monitoring switch cabinet of embodiment three.
As shown in figure 4, for according to the structural schematic diagram of the device of the temperature rise of the contact point of the monitoring switch cabinet of the present embodiment.
The device also wraps other than first acquisition unit 301 shown in Fig. 3, second acquisition unit 302 and a predicting unit 303
Include a third acquiring unit 401 and a determination unit 402.
Wherein, third acquiring unit 401 is used to obtain the primary current of the switchgear in the initial sampling period；Third is true
Order member 402 is for determining whether contact point breaks down according to third temperature rise and primary current.
Optionally it is determined that unit 402 is specifically used for:
According to the following formula, the contact resistance of contact point and the product of thermal resistance are determined:
T=Iw2*R*Rθ
Wherein, Iw indicates that primary current, R indicate that the contact resistance of contact point, R θ indicate the thermal resistance of contact point；
If the contact resistance of contact point and the product of thermal resistance are greater than a preset threshold, it is determined that break down contact point；
Optionally, primary current is the average value of primary current in the initial sampling period.
Optionally, which is the product of contact resistance and thermal resistance of the contact point under normal contact condition and one
The sum of default error.
The working method of each unit of the present embodiment is identical as previous embodiment, and details are not described herein.
According to the present embodiment, connecing for contact point is determined by the temperature rise of the contact point of monitoring switch cabinet, then by the temperature rise
The product value of electric shock resistance and thermal resistance, and then determine whether contact point breaks down by the product value.In such manner, it is possible in switchgear
It determines whether contact point breaks down in the shorter time after start-up operation, and then guarantees service life and the correlation work of switchgear
Make the safety of personnel.
The invention of this reality also provides the device of the temperature rise of the contact point of another monitoring switch cabinet, including at least one processor and
At least one processor.Wherein, memory is for storing instruction.The instruction execution that processor is used to be stored according to memory is aforementioned
The method of the temperature rise of the contact point of monitoring switch cabinet described in any embodiment.
The embodiment of the present invention also provides a kind of readable storage medium storing program for executing.Machine readable finger is stored in the readable storage medium storing program for executing
It enables, for machine readable instructions when being executed by a machine, machine executes monitoring switch cabinet described in aforementioned any embodiment
The method of the temperature rise of contact point.
Machine readable instructions are stored on the readable medium, which makes to handle when being executed by processor
Device executes any method above-mentioned.Specifically, system or device equipped with readable storage medium storing program for executing can be provided, it is readable at this
Store on storage medium realize above-described embodiment in any embodiment function software program code, and make the system or
The computer or processor of device read and execute the machine readable instructions being stored in the readable storage medium storing program for executing.
In this case, it is real that any one of above-described embodiment can be achieved in the program code itself read from readable medium
The function of example is applied, therefore the readable storage medium storing program for executing of machine readable code and storage machine readable code constitutes of the invention one
Point.
The embodiment of readable storage medium storing program for executing include floppy disk, hard disk, magneto-optic disk, CD (such as CD-ROM, CD-R, CD-RW,
DVD-ROM, DVD-RAM, DVD-RW, DVD+RW), tape, non-volatile memory card and ROM.It selectively, can be by communication network
Network download program code from server computer or on cloud.
It will be appreciated by those skilled in the art that each embodiment disclosed above can be in the situation without departing from invention essence
Under make various changes and modifications.Therefore, protection scope of the present invention should be defined by the appended claims.
It should be noted that step and unit not all in above-mentioned each process and each system construction drawing is all necessary
, certain step or units can be ignored according to the actual needs.Each step execution sequence be not it is fixed, can be according to need
It is adjusted.Apparatus structure described in the various embodiments described above can be physical structure, be also possible to logical construction, that is, have
A little units may be realized by same physical entity, be realized alternatively, some units may divide by multiple physical entities, alternatively, can be with
It is realized jointly by certain components in multiple autonomous devices.
In the above various embodiments, hardware cell mechanically or can be realized electrically.For example, a hardware list
Member or processor may include that permanent dedicated circuit or logic (such as special processor, FPGA or ASIC) are corresponding to complete
Operation.Hardware cell or processor can also include programmable logic or circuit (such as general processor or other programmable processing
Device), interim setting can be carried out by software to complete corresponding operating.Concrete implementation mode (mechanical system or it is dedicated forever
Long property circuit or the circuit being temporarily arranged) it can be determined based on cost and temporal consideration.
Detailed displaying and explanation carried out to the present invention above by attached drawing and preferred embodiment, however the present invention is not limited to
These embodiments having revealed that, base could be aware that with above-mentioned multiple embodiment those skilled in the art, can combine above-mentioned difference
Code audit means in embodiment obtain the more embodiments of the present invention, these embodiments also protection scope of the present invention it
It is interior.
Claims (10)
1. the method for predicting the temperature rise of the contact point of power equipment characterized by comprising
Obtain an initial sampling period when starting the first temperature rise of a contact point of a power equipment and at the end of
The second temperature rise, the contact point be the power equipment at least two components contact position；
Obtain the time constant of the one order inertia system an of power equipment；
It is described at the end of predicting the X sampling period to connect according to first temperature rise, second temperature rise and the time constant
The third temperature rise of contact, X=[LN], wherein L is positive integer and L >=3, s are a sampling period, time constant described in N*s=.
2. the method according to claim 1, wherein according to first temperature rise, second temperature rise and
The X, after predicting the X sampling period third temperature rise of the contact point include:
According to the following formula, the third temperature rise T of the contact point is determined:
T=(Δ Kn-ΔKn-1*e-1/N)/(1-e-1/N)
Wherein, Δ Kn-1For first temperature rise, Δ KnFor second temperature rise.
3. method according to claim 1 or 2, which is characterized in that contact at the end of predicting the X sampling period
After the third temperature rise of point, further includes:
Obtain the primary current of the power equipment in the initial sampling period；
According to the third temperature rise and the primary current, determine whether the contact point breaks down.
4. according to the method described in claim 3, it is characterized in that, being determined according to the third temperature rise and the primary current
Whether break down the contact point
According to the following formula, the contact resistance of the contact point and the product of thermal resistance are determined:
T=Iw2*R*Rθ
Wherein, Iw indicates that the primary current, R indicate the contact resistance of the contact point, RθIndicate the thermal resistance of the contact point；
If the contact resistance of the contact point and the product of thermal resistance are greater than a preset threshold, it is determined that event occurs in the contact point
Barrier；
Optionally, the primary current is the average value of primary current in the initial sampling period.
5. predicting the device of the temperature rise of the contact point of power equipment characterized by comprising
One first acquisition unit, for obtain an initial sampling period start when power equipment a contact point
One temperature rise and at the end of the second temperature rise, the contact point be the power equipment at least two components contact position；
One second acquisition unit, the time constant of the one order inertia system for obtaining a power equipment；
One predicting unit, for predicting X according to first temperature rise, second temperature rise and the time constant
The third temperature rise of the contact point at the end of a sampling period, X=[LN], wherein L is positive integer and L >=3, s are a sampling
Period, N*s=time constant.
6. device according to claim 5, which is characterized in that the predicting unit is specifically used for:
According to the following formula, the third temperature rise T of the contact point is determined:
T=(Δ Kn-ΔKn-1*e-1/N)/(1-e-1/N)
Wherein, Δ Kn-1For first temperature rise, Δ KnFor second temperature rise.
7. device according to claim 5 or 6, which is characterized in that further include:
One third acquiring unit, for obtaining the primary current of the power equipment in the initial sampling period；
One determination unit, for determining whether the contact point event occurs according to the third temperature rise and the primary current
Barrier.
8. device according to claim 7, which is characterized in that the determination unit is specifically used for:
According to the following formula, the contact resistance of the contact point and the product of thermal resistance are determined:
T=Iw2*R*Rθ
Wherein, Iw indicates that the primary current, R indicate the contact resistance of the contact point, RθIndicate the thermal resistance of the contact point；
If the contact resistance of the contact point and the product of thermal resistance are greater than a preset threshold, it is determined that event occurs in the contact point
Barrier；
Optionally, the primary current is the average value of primary current in the initial sampling period.
9. predicting the device of the temperature rise of the contact point of power equipment characterized by comprising
At least one processor, for storing instruction；
At least one processor is used for the instruction execution according to claim 1 any one of -4 stored according to the memory
The method of the temperature rise of the contact point of the prediction power equipment.
10. readable storage medium storing program for executing, which is characterized in that be stored with machine readable instructions, the machine in the readable storage medium storing program for executing
For readable instruction when being executed by a machine, the machine executes prediction electric power described in any one of -4 according to claim 1
The method of the temperature rise of the contact point of equipment.
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