CN108508348A - A kind of control circuit earth-fault protection function detection device and method - Google Patents
A kind of control circuit earth-fault protection function detection device and method Download PDFInfo
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- CN108508348A CN108508348A CN201810220262.7A CN201810220262A CN108508348A CN 108508348 A CN108508348 A CN 108508348A CN 201810220262 A CN201810220262 A CN 201810220262A CN 108508348 A CN108508348 A CN 108508348A
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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
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/282—Testing of electronic circuits specially adapted for particular applications not provided for elsewhere
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Abstract
The present invention relates to a kind of control circuit earth-fault protection function detection device and methods, including：Sampling module, Signal-regulated kinase, processor and the linear load circuit module of ladder, wherein the linear load blocks of ladder include multiple power relays and multiple power resistors, the stepped increasing or decreasing of power resistor resistance value；The processor is connect with the linear load blocks of the ladder; multiple power relays for controlling the linear load blocks of the ladder are closed successively; corresponding ground connection Leakage Current when each power relay is closed is obtained, is judged according to the variation tendency feature of the ground connection Leakage Current and whether display control circuit earth-fault protection function is normal.Operating process of the present invention is convenient, is suitble to widespread adoption to promote, various signals are directly to acquire, high certainty of measurement, reliably.
Description
Technical field
The invention belongs to circuit function detection technique fields, and in particular to a kind of control circuit earth-fault protection function inspection
Survey device and method.
Background technology
In low-voltage electrical control system, control circuit is generally by button, various electric switches, protection appliance contact and control
Relay processed is connected by conducting wire and is formed, and mainly by controlling closure or the disconnection of relay in circuit, is provided and is led for main circuit
Logical and two kinds of signals of cut-out, to realize the purpose automatically controlled.So-called control circuit earth fault refers to control circuit one
Under fixed condition, such as electric switch contact deflection, wire insulation fail, ambient humidity is big, original of slipping up in maintenance process
Cause causes electric switch contact or line conductor in control circuit (to be noted with ground wire：Such as the metal shell of electrical equipment) it connects
The phenomenon that.
In the control circuit for having protection system to earth, earth fault can be such that short circuit in control circuit, overcurrent protects
Protection unit is acted or is burnt, and the short circuit current for being grounded process formation may also lead to personal electric shock injures and deaths and fire incident.
In not having the control circuit of protection system to earth, earth fault can cause the control signal in control circuit by ground wire into
Row conducting, the various electric switches in short circuit control circuit, finally makes control relay normally closed, electrical equipment is caused to open
Dynamic operation, causes serious casualty accident.Therefore it needs that effective ground connection is arranged in the control circuit of low-voltage electrical control system
Failure protection function.
Whether the control circuit of detection low-voltage electrical control system is arranged effective earth-fault protection function, has become
Essential work during low-voltage electrical control system safety detection.The well known detection control circuit ground connection event of industry at present
There are two ways to hindering defencive function：Insulation resistance method and analogue ground method.
Insulation resistance method first when insulation resistance between circuit of measurement and control and ground wire, is needed according to practical tested
The different voltages grade of control circuit selects corresponding test voltage above Insulation Resistance Tester, can just measure and align
True insulation resistance.The disadvantages of this method, which compares, relies on the electrical technical ability that implementer grasps, and also needs to first tear open before starting to measure
Except original ground protection line in control circuit, the structural shape of original circuit is changed.In addition, when measuring insulation resistance, make
Test voltage belongs to high-voltage signal, is very easy to breakdown and burns the sensitive electron component in tested control circuit, makes
At very big loss.
Secondly analogue ground method is passed through directly by the conductor of control circuit and ground wire short circuit with conducting wire and observes control when test
Whether circuit ground error protection measure processed effectively starts in time, and whether control relay is closed to determine whether in the presence of connecing
Earth fault electric logic hidden danger.This method belongs to lossy test, can cause the original short circuit of control circuit, overcurrent protective device
Or control circuit mainboard is acted or is burnt, and brings inevitable loss.In addition, during the test, what short circuit generated can not
The electric current of control, easily causes personal electric shock casualty accident, and the electric arc and electric spark of generation also easily cause fire incident.
Therefore, a kind of safety is designed, the control circuit earth-fault protection function detection device of strong applicability becomes ability
The problem of domain urgent need to resolve.
Invention content
In view of the deficiencies of the prior art, the present invention provides a kind of control circuit earth-fault protection function detection device skill and
Method, operating process is convenient, and widespread adoption is suitble to promote.
To solve the above problems, the technical solution adopted by the present invention is：
A kind of control circuit earth-fault protection function detection device, including：Sampling module, Signal-regulated kinase, processing
Device and the linear load circuit module of ladder, wherein
The sampling module is connect with the Signal-regulated kinase, for obtain voltage sample and current sample and to its into
Row signal processing；
The Signal-regulated kinase is connected to the processor, the nominal operation electricity for tested control circuit to be calculated
Pressure and rated operational current, and Leakage Current over the ground；
The linear load blocks of ladder include multiple power relays and multiple power resistors, the power resistor resistance value
Stepped increasing or decreasing；
The processor is connect with the linear load blocks of the ladder, for controlling the more of the linear load blocks of the ladder
A power relay is closed successively, corresponding ground connection Leakage Current when each power relay is closed is obtained, according to described
The variation tendency feature for being grounded Leakage Current judges and whether display control circuit earth-fault protection function is normal.
Further, further include display device, for showing the current status.
Further, the sampling module includes：Rated operational voltage sample circuit and rated operational current sample circuit, with
And Leakage Current sample circuit over the ground；
Further, the rated operational voltage sample circuit includes multiple concatenated sampling resistors, and meets following relationship
Formula：
Wherein, R10、R11、R12、R13、R14For sampling resistor, VP1-P2Circuit rated operational voltage in order to control, VvFor sampling resistor R12
On voltage.
Further, the rated operational current sample circuit and Leakage Current sample circuit includes being serially connected over the ground
Switching switch, metal foil sampling resistor and control relay, wherein
The metal foil sampling resistor resistance value is 1 ohm, the rated operational current or earth leakage current sample circuit
Meet following relationship：Vi=R1× I=1000 × I (mV), wherein ViFor sampled voltage, I is for rated operational current or over the ground
Leakage current, R1For metal foil resistor.
Further, the Signal-regulated kinase includes：Differential signal amplifying unit, analog channel switch unit, Bart are fertile
Hereby filter unit and RMS conversion unit.
Further, each power relay closing time is identical.
A method of into line control circuit earth-fault protection Function detection, including：
1) voltage sample and current sample are obtained；
2) it will send to processor and calculate after voltage sample and current sample progress signal processing, obtain tested control electricity
The rated operational voltage and rated operational current on road；
3) processor disconnects after being closed same time successively by permanent order control power relay, and collects simultaneously each
The ground connection Leakage Current of corresponding tested control circuit during a power relay is closed, since the resistance value of power resistor is in ladder
The state successively decreased/increased judges to be tested control circuit earth-fault protection function according to the stepped change feature of ground connection Leakage Current
It is whether normal.
The beneficial effects of the present invention are：
(1) operating process is convenient, and widespread adoption is suitble to promote.
(2) various signals are directly to acquire, high certainty of measurement, reliably.
(3) present invention is passive measurement, will not burn the original control circuit component of damage.
(4) automatic intelligent of the present invention executes, and measurement process is safely controllable.
Description of the drawings
Fig. 1 is detection device schematic diagram of the present invention.
Fig. 2 is the circuit diagram of sampling module of the present invention.
Fig. 3 is Signal-regulated kinase schematic diagram of the present invention.
Fig. 4 is the linear load blocks circuit diagram of ladder of the present invention.
Fig. 5 is present invention ground connection Leakage Current display schematic diagram.
Specific implementation mode
In order to make those skilled in the art more fully understand technical scheme of the present invention, with reference to specific embodiment to this
Invention is described in further detail.It note that the embodiments described below is exemplary, be only used for explaining the present invention, and
It is not considered as limiting the invention.Particular technique or condition are not specified in embodiment, according to document institute in the art
The technology or condition of description are carried out according to product description.Production firm person is not specified in component or accessory used, is
It can be with conventional products that are commercially available.
According to an aspect of the present invention, the present invention provides a kind of control circuit earth-fault protection Function detection dresses
It sets, Fig. 1 is detection device schematic diagram of the present invention, as shown in Figure 1, including：Sampling module, Signal-regulated kinase, processor and
The linear load circuit module of ladder, wherein the sampling module is connect with the Signal-regulated kinase, for obtaining voltage sample
Signal processing is carried out with current sample and to it；The Signal-regulated kinase is connected to the processor, for improving and calculating
Obtain the rated operational voltage and rated operational current of tested control circuit；The linear load blocks of ladder include multiple power
Relay and multiple power resistors, the stepped increasing or decreasing of power resistor resistance value；The processor and the ladder
Linear load module connects, and multiple power relays for controlling the linear load blocks of the ladder are closed successively, obtains every
A power relay corresponding ground connection Leakage Current when being closed is sentenced according to the variation tendency feature of the ground connection Leakage Current
Whether disconnected and display control circuit earth-fault protection function is normal.
According to a particular embodiment of the invention, Fig. 2 is the circuit diagram of sampling module of the present invention, as shown, described
Sampling module includes：Rated operational voltage sample circuit and rated operational current sample circuit.Rated operational voltage sample circuit
By R10、R11、R12、R13、R14Five accurate sampling resistors are composed in series, wherein VP1-P2Circuit rated operational voltage in order to control, Vv
For sampling resistor R12On voltage.
According to Ohm's law sampling resistor R can be obtained in conjunction with the actual resistance numerical value of each sampling resistor in figure12On
The voltage V in facevWith control circuit rated operational voltage VP1-P2Relationship be：
Therefore, according to relation above, the sampled voltage V that can will be measuredv, convert and obtain the specified of practical control circuit
Operating voltage VP1-P2。
According to the rated operational voltage range of control circuit in common low voltage electrical equipment, below table numerical value can be obtained
Relationship：
Rated operational current sample circuit is by switching switch SW, a high-precision metal foil sampling resistor R1(resistance value 1
Ohm) and a control relay K10Coil be composed in series.When switching switch SW closures, relay K is controlled10Coil obtains
Electric Operating In Persistent Current Mode then flows through high-precision metal foil sampling resistor R1With control relay K10The rated operational current of coil is
I。
According to Ohm's law, high-precision metal foil resistance R can be obtained1Voltage V aboveiWith control circuit nominal operation
The relationship of electric current I is：
Vi=R1× I=1000 × I (mV)
Therefore, according to relation above, the sampled voltage V that can will be measuredi, convert and obtain the specified of practical control circuit
Operating current I.
Leakage Current sample circuit operating current sample circuit with depending on is similar over the ground implements.
According to a particular embodiment of the invention, Fig. 3 is Signal-regulated kinase schematic diagram of the present invention, as shown, the letter
Number conditioning module includes：Differential signal amplifying unit, analog channel switch unit, butterworth filter unit and real effective
Converting unit.The front end of wherein differential signal amplifying unit effect is two output signals of sample circuit, with the input of difference
Form entering signal amplifying unit, amplification difference mode signal and suppression common mode signal, are finally connected to mould in the form of Single-end output
Quasi- channel switch unit.The instruction that analog channel switch unit can be sent out according to processor, is switched to tested accurately and in time
Analog channel achievees the purpose that the analog signal of multi pass acquisition shares an A/D analog-to-digital conversion interface, to improve A/D moduluses
The utilization rate of translation interface reduces the cost of analog signal conditioning circuit.Butterworth filter unit is that a corner frequency is
50 hertz of 2 pole lowpass filters, can effectively limit the electrical noise of analog signal.RMS conversion unit is mainly made
With being that the alternating current and direct current analog signal after the butterworth filter cell processing of front end is uniformly converted to direct current signal, to make
Obtain entire signal conditioning circuit compatible with alternating, DC simulation signal simultaneously.
According to a particular embodiment of the invention, Fig. 4 is the linear load blocks circuit diagram of ladder of the present invention, as schemed institute
Show, the linear load blocks of ladder include six power relay K20、K21、K22、K23、K24、K25Contact and power resistor
R20、R21、R22、R23、R24、R25Form the linear load circuit of six autonomous channels.Wherein power resistor R20、R21、R22、R23、
R24、R25Resistance value be 5.1k, 1.5k, 1k, 510,200,100 ohm respectively, rank can also be used certainly in stairway degression state
The incremental state of ladder.
According to another aspect of the present invention, the present invention provides a kind of sides of control circuit earth-fault protection Function detection
Method, which is characterized in that including：
1) voltage sample and current sample are obtained；
2) it will send to processor and calculate after voltage sample and current sample progress signal processing, obtain tested control electricity
The rated operational voltage and rated operational current on road；
3) processor disconnects after being closed same time successively by permanent order control power relay, and collects simultaneously each
The ground connection Leakage Current of corresponding tested control circuit during a power relay is closed, since the resistance value of power resistor is in ladder
The state successively decreased/increased judges to be tested control circuit earth-fault protection function according to the stepped change feature of ground connection Leakage Current
It is whether normal.
Specifically, obtaining sampled result V by voltage sampling circuit firstv, then switch switch SW and be closed, and pass through electricity
It flows sample circuit and obtains sampled result Vi, two sampled result VvAnd ViPass through signal conditioning circuit respectively, sampled result is carried out
A series of analog signal processings such as differential amplification, Butterworth lowpass wave and RMS conversion, are finally-transmitted to processor
A/D analog-to-digital conversion interfaces；
The specified work of tested control circuit is calculated by software algorithm according to the conversion relation of above-mentioned formula for processor
Make voltage VP1-P2With rated operational current I；
Processor is then according to fixed sequence, control power relay K20、K21、K22、K23、K24、K25It is closed dimension successively
It is disconnected after holding 0.5 second, and collects the ground connection leakage of corresponding tested control circuit during each power relay is closed simultaneously
Electric current I20、I21、I22、I23、I24、I25。
Because of the power resistor R of six autonomous channels20、R21、R22、R23、R24、R25Resistance value from high toward one rank of low presentation
The state that ladder successively decreases, therefore can be according to the ground connection Leakage Current I of six autonomous channels20、I21、I22、I23、I24、I25Ladder become
Change feature, to judge whether tested control circuit earth-fault protection function is normal.
Fig. 5 is present invention ground connection Leakage Current display schematic diagram, as shown, as ground connection Leakage Current I20、I21、I22、
I23、I24、I25It is apparent that increment feature is presented, and there are any one ground connection Leakage Current numerical value is specified more than tested control circuit
When operating current I, it can determine whether that tested control circuit earth-fault protection function is effective.
As ground connection Leakage Current I20、I21、I22、I23、I24、I25Increment feature unobvious are presented, and there are maximum ground connection
When Leakage Current numerical value is both less than or is equal to tested control circuit rated operational current I, tested control circuit ground connection event can determine whether
Hinder defencive function failure.
As ground connection Leakage Current I20、I21、I22、I23、I24、I25When presentation numerical value is zero, tested control circuit can determine whether
Belong to isolated neutral system, earth-fault protection disabler.
A kind of control circuit earth-fault protection function detection device of the invention and method in summary, operating process side
Just, it is suitble to widespread adoption to promote.Various signals are directly to acquire, high certainty of measurement, reliably.The present invention is passive measurement,
The original control circuit component of damage will not be burnt.Automatic intelligent of the present invention executes, and measurement process is safely controllable.
In the description of the present invention, it is to be understood that, term " first ", " second " are used for description purposes only, and cannot
It is interpreted as indicating or implies relative importance or implicitly indicate the quantity of indicated technical characteristic.Define as a result, " the
One ", the feature of " second " can explicitly or implicitly include one or more this feature.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；Can be that machinery connects
It connects, can also be electrical connection；It can be directly connected, can also can be indirectly connected through an intermediary in two elements
The interaction relationship of the connection in portion or two elements.It for the ordinary skill in the art, can be according to specific feelings
Condition understands the concrete meaning of above-mentioned term in the present invention.
In the present invention unless specifically defined or limited otherwise, fisrt feature can be with "above" or "below" second feature
It is that the first and second features are in direct contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be
One feature is directly under or diagonally below the second feature, or is merely representative of fisrt feature level height and is less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be any
It can be combined in any suitable manner in a or multiple embodiments or example.In addition, without conflicting with each other, the technology of this field
The feature of different embodiments or examples described in this specification and different embodiments or examples can be combined by personnel
And combination.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changes, replacing and modification, meanwhile, for those of ordinary skill in the art, the think of according to the application
Think, there will be changes in the specific implementation manner and application range.
Claims (8)
1. a kind of control circuit earth-fault protection function detection device, which is characterized in that including：Sampling module, signal condition
Module, processor and the linear load circuit module of ladder, wherein
The sampling module is connect with the Signal-regulated kinase, for obtaining voltage sample and current sample and carrying out letter to it
Number processing；
The Signal-regulated kinase is connected to the processor, the nominal operation for improving and being calculated tested control circuit
Voltage and rated operational current；
The linear load blocks of ladder include multiple power relays and multiple power resistors, and the power resistor resistance value is in rank
Scalariform increasing or decreasing；
The processor is connect with the linear load blocks of the ladder, multiple work(for controlling the linear load blocks of the ladder
Rate relay is closed successively, corresponding ground connection Leakage Current when each power relay is closed is obtained, according to the ground connection
The variation tendency feature of Leakage Current judges and whether display control circuit earth-fault protection function is normal.
2. the apparatus according to claim 1, which is characterized in that further include display device, for showing the current status.
3. the apparatus according to claim 1, which is characterized in that the sampling module includes：Rated operational voltage sampling electricity
Road and rated operational current sample circuit, and Leakage Current sample circuit over the ground.
4. device according to claim 3, which is characterized in that the rated operational voltage sample circuit includes multiple series connection
Sampling resistor, and meet following relationship：
Wherein, R10、R11、R12、R13、R14For sampling resistor, VP1-P2Circuit rated operational voltage in order to control, VvFor sampling resistor R12
On voltage.
5. device according to claim 3, which is characterized in that the rated operational current sample circuit and reveal over the ground
Current sampling circuit includes the switching switch being serially connected, metal foil sampling resistor and control relay, wherein
The metal foil sampling resistor resistance value is 1 ohm, and the rated operational current or earth leakage current sample circuit meet
Following relationship：Vi=R1× I=1000 × I (mV), wherein ViFor sampled voltage, I is rated operational current or leaks over the ground
Electric current, R1For metal foil resistor.
6. the apparatus according to claim 1, which is characterized in that the Signal-regulated kinase includes：Differential signal amplification is single
Member, analog channel switch unit, butterworth filter unit and RMS conversion unit.
7. the apparatus according to claim 1, which is characterized in that each power relay closing time is identical.
8. it is a kind of using claim 1~7 any one of them device into line control circuit earth-fault protection Function detection
Method, which is characterized in that including：
1) voltage sample and current sample are obtained；
2) it will send to processor and calculate after voltage sample and current sample progress signal processing, obtain tested control circuit
Rated operational voltage and rated operational current；
3) processor disconnects after being closed same time successively by permanent order control power relay, and collects each work(simultaneously
The ground connection Leakage Current of corresponding tested control circuit during rate relay is closed, since the resistance value of power resistor is passed in ladder
The state for subtracting/increasing judges that being tested control circuit earth-fault protection function is according to the stepped change feature of ground connection Leakage Current
It is no normal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810220262.7A CN108508348B (en) | 2018-03-16 | 2018-03-16 | Device and method for detecting ground fault protection function of control circuit |
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|---|---|---|---|
| CN201810220262.7A CN108508348B (en) | 2018-03-16 | 2018-03-16 | Device and method for detecting ground fault protection function of control circuit |
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| CN108508348B CN108508348B (en) | 2023-11-03 |
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| CN110333437A (en) * | 2019-07-08 | 2019-10-15 | 中国电力科学研究院有限公司 | A kind of detection system and method for injected type stator ground protection device |
| CN110333437B (en) * | 2019-07-08 | 2023-07-18 | 中国电力科学研究院有限公司 | Detection system and method for injection type stator grounding protection device |
| CN113900043A (en) * | 2021-10-09 | 2022-01-07 | 北京卫星环境工程研究所 | Testing equipment for measuring system conduction and loop corresponding relation for spacecraft thermal test |
| CN113900043B (en) * | 2021-10-09 | 2024-05-28 | 北京卫星环境工程研究所 | Measurement system conduction and loop corresponding relation test equipment for spacecraft thermal test |
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