CN208172173U - A kind of control circuit earth-fault protection function detection device - Google Patents
A kind of control circuit earth-fault protection function detection device Download PDFInfo
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- CN208172173U CN208172173U CN201820362432.0U CN201820362432U CN208172173U CN 208172173 U CN208172173 U CN 208172173U CN 201820362432 U CN201820362432 U CN 201820362432U CN 208172173 U CN208172173 U CN 208172173U
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Abstract
The utility model relates to a kind of control circuit earth-fault protection function detection devices, including：Sampling module, signal conditioning module, 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 successively closed; corresponding ground connection Leakage Current when each power relay closure is obtained, simultaneously whether display control circuit earth-fault protection function is normal according to the variation tendency feature judgement of the ground connection Leakage Current.The utility model operating process is convenient, and widespread adoption is suitble to promote, and various signals are directly to acquire, and measurement accuracy is high, reliably.
Description
Technical field
The utility model belongs to circuit function detection technique field, and in particular to a kind of control circuit earth-fault protection function
It can detection device.
Background technique
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 the main closing or opening by controlling relay in circuit is provided for main circuit and led
Logical and two kinds of signals of cutting, to realize the purpose of automatic control.So-called control circuit ground fault, refers to control circuit one
Under fixed condition, such as electric switch contact deflection, wire insulation fail, ambient humidity is big, original of making mistakes in maintenance process
Cause causes electric switch contact or line conductor and ground wire in control circuit (to infuse：Such as the metal shell of electrical equipment) it connects
The phenomenon that.
In the control circuit for having protection system to earth, ground fault can be such that short circuit in control circuit, overcurrent protects
Protection unit is acted or is burnt, and is grounded the short circuit current that process is formed and be may also lead to person electric shock injures and deaths and fire incident.
In the control circuit for not having protection system to earth, ground fault will cause the control signal in control circuit by ground wire into
Row conducting, the various electric switches in short circuit control route, finally makes to control relay normally closed, electrical equipment is caused to open
Dynamic operation, causes serious casualty accident.Therefore need to be arranged effective ground connection 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, just can be measured and align
True insulation resistance.The disadvantages of this method, which compares, relies on the electrical technical ability that implementer grasps, and also needs first to tear open before starting measurement
Except ground protection line original in control circuit, the structural shape of original circuit is changed.In addition, making when measurement insulation resistance
Test voltage belongs to high-voltage signal, is very easy to breakdown and burns the sensitive electronic components in tested control circuit, makes
At very big loss.
Secondly analogue ground method passes through observation control directly by the conductor of control circuit and ground wire short circuit with conducting wire 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, will 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 person 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.
Utility model content
In view of the shortcomings of the prior art, the utility model provides a kind of control circuit earth-fault protection function detection devices
Skill, operating process is convenient, and widespread adoption is suitble to promote.
To solve the above problems, the technical solution adopted in the utility model is：
A kind of control circuit earth-fault protection function detection device, including：Sampling module, signal conditioning module, processing
Device and the linear load circuit module of ladder, wherein
The sampling module is connect with the signal conditioning module, for obtain voltage sample and current sample and to its into
Row signal processing；
The signal conditioning module is connected to the processor, for the nominal operation electricity of 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 successively closed, and corresponding ground connection Leakage Current when each power relay closure is obtained, according to described
It is grounded the variation tendency feature judgement of Leakage Current and whether display control circuit earth-fault protection function is normal.
It 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-P2For control circuit rated operational voltage, 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 conditioning module 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.
The beneficial effects of the utility model are：
(1) operating process is convenient, and widespread adoption is suitble to promote.
(2) various signals are directly to acquire, and measurement accuracy is high, reliably.
(3) the utility model is passive measurement, will not burn the original control circuit component of damage.
(4) the utility model automatic intelligent executes, and measurement process is safely controllable.
Detailed description of the invention
Fig. 1 is the utility model detection device schematic diagram.
Fig. 2 is the circuit diagram of the utility model sampling module.
Fig. 3 is the utility model signal conditioning module schematic diagram.
Fig. 4 is the linear load blocks circuit diagram of the utility model ladder.
Fig. 5 is that the utility model is grounded Leakage Current display schematic diagram.
Specific embodiment
In order to enable those skilled in the art to better understand the technical solutions of the present invention, combined with specific embodiments below
The utility model is described in further detail.It note that the embodiments described below is exemplary, be only used for explaining this
Utility model, and should not be understood as limiting the present invention.Particular technique or condition are not specified in embodiment, according to this
Technology or conditions described in document in field are carried out according to product description.Life is not specified in component or accessory used
Manufacturer person is produced, being can be with conventional products that are commercially available.
One aspect according to the present utility model, the utility model provide a kind of control circuit earth-fault protection function
Detection device, Fig. 1 is the utility model detection device schematic diagram, as shown in Figure 1, including：Sampling module, signal conditioning module,
Processor and the linear load circuit module of ladder, wherein the sampling module is connect with the signal conditioning module, for obtaining
It takes voltage sample and current sample and signal processing is carried out to it；The signal conditioning module is connected to the processor, and is used for
Improve and be calculated the rated operational voltage and rated operational current of tested control circuit；The linear load blocks packet of ladder
Include multiple power relays and multiple power resistors, the stepped increasing or decreasing of power resistor resistance value；The processor
It is connect with the linear load blocks of the ladder, multiple power relays for controlling the linear load blocks of the ladder successively close
It closes, obtains corresponding ground connection Leakage Current when each power relay closure, according to the variation of the ground connection Leakage Current
Simultaneously whether display control circuit earth-fault protection function is normal for trend feature judgement.
Specific embodiment according to the present utility model, Fig. 2 is the circuit diagram of the utility model sampling module, as schemed institute
Show, the sampling module includes：Rated operational voltage sample circuit and rated operational current sample circuit.Rated operational voltage is adopted
Sample circuit is by R10、R11、R12、R13、R14Five accurate sampling resistors are composed in series, wherein VP1-P2For control circuit nominal operation electricity
Pressure, VvFor sampling resistor R12On voltage.
According to Ohm's law, in conjunction with the actual resistance numerical value of sampling resistor each in figure, available sampling resistor R12On
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, available below table numerical value
Relationship：
Rated operational current sample circuit is by a 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 closure, 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, available high-precision metal foil resistance R1Voltage 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.
Specific embodiment according to the present utility model, Fig. 3 is the utility model signal conditioning module schematic diagram, as schemed institute
Show, the signal conditioning module includes：Differential signal amplifying unit, analog channel switch unit, butterworth filter unit with
And RMS conversion unit.Wherein the front end of differential signal amplifying unit effect is two output signals of sample circuit, with
The input form entering signal amplifying unit of difference amplifies difference mode signal and inhibits common-mode signal, finally with the shape of Single-end output
Formula is connected to analog channel switch unit.The instruction that analog channel switch unit can be issued according to processor, cuts accurately and in time
Tested analog channel is changed to, achievees the purpose that the analog signal of multi pass acquisition shares an A/D analog-to-digital conversion interface, to mention
The utilization rate of high A/D analog-to-digital conversion interface, reduces the cost of analog signal conditioning circuit.Butterworth filter unit is one and turns
The 2 pole lowpass filters that frequency is 50 hertz are rolled over, the electrical noise of analog signal can be effectively limited.RMS conversion list
First main function is that the alternating current and direct current analog signal after the butterworth filter cell processing of front end is uniformly converted to direct current letter
Number, so that entire signal conditioning circuit while compatible with alternating, DC simulation signal.
Specific embodiment according to the present utility model, Fig. 4 are the linear load blocks circuit diagram of the utility model ladder,
As shown, the linear load blocks of ladder include six power relay K20、K21、K22、K23、K24、K25Contact and power
Resistance 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, can also be adopted certainly in stairway degression state
With the state being increased stepwise.
Another aspect according to the present utility model, the utility model provide a kind of control circuit earth-fault protection function
The method of detection, which is characterized in that including：
1) voltage sample and current sample are obtained；
2) it will send after voltage sample and current sample progress signal processing to processor and calculate, obtain tested control electricity
The rated operational voltage and rated operational current on road；
3) processor disconnects after being successively closed same time by permanent order control power relay, and collects simultaneously each
The ground connection Leakage Current of corresponding tested control circuit during a power relay closure, since the resistance value of power resistor is in ladder
The state successively decreased/increased judges 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 closure, 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 interface；
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 controls power relay K then according to fixed sequence20、K21、K22、K23、K24、K25Successively closure dimension
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 that the utility model is grounded Leakage Current display schematic diagram, as shown, as ground connection Leakage Current I20、I21、
I22、I23、I24、I25It is obvious that increment feature is presented, and there are any one ground connection Leakage Current numerical value to be greater than tested control circuit volume
When determining 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、I25It is unobvious that increment feature is 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 utility model in summary, operating process side
Just, it is suitble to widespread adoption to promote.Various signals are directly to acquire, and measurement accuracy is high, reliably.The utility model is passive surveys
Amount will not burn the original control circuit component of damage.The utility model automatic intelligent executes, and measurement process is safely controllable.
In the description of the present invention, it should be understood that term " first ", " second " are used for description purposes only, and
It cannot be understood as indicating or implying relative importance or implicitly indicate the quantity of indicated technical characteristic.It defines as a result,
The feature of " first ", " second " can explicitly or implicitly include one or more of the features.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " Gu
It is fixed " etc. terms shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be
Mechanical connection, is also possible to be electrically connected；It can be directly connected, two can also be can be indirectly connected through an intermediary
The interaction relationship of connection or two elements inside element.It for the ordinary skill in the art, can basis
Concrete 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 is in the second feature " on " or " down "
It can be that the first and second features directly contact or the first and second features are by intermediary mediate contact.Moreover, first is special
Sign can be fisrt feature above the second feature " above ", " above " and " above " and be directly above or diagonally above the second feature, or only
Indicate that first feature horizontal height is higher than second feature.Fisrt feature under the second feature " below ", " below " and " below " can be with
It is that fisrt feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal height 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 contained at least one embodiment or example of the utility model.In the present specification, to the schematic table of above-mentioned term
Identical embodiment or example need not be directed to by stating.Moreover, particular features, structures, materials, or characteristics described can be
It can be combined in any suitable manner in any one or more embodiment or examples.In addition, without conflicting with each other, this field
Technical staff can carry out the feature of different embodiments or examples described in this specification and different embodiments or examples
Combination and combination.
Although the embodiments of the present invention have been shown and described above, it is to be understood that above-described embodiment is
Illustratively, it should not be understood as limiting the present invention, those skilled in the art are in the scope of the utility model
It inside can make changes, modifications, alterations, and variations to the above described embodiments, at the same time, for those skilled in the art, foundation
The thought of the application, there will be changes in the specific implementation manner and application range.
Claims (7)
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 blocks of ladder, wherein
The sampling module is connect with the signal conditioning module, for obtaining voltage sample and current sample and carrying out letter to it
Number processing；
The signal conditioning module is connected to the processor, for improving and being calculated the nominal operation of tested control circuit
Voltage and rated operational current；
The linear load blocks of ladder include multiple power relays and multiple power resistors, and the resistance value of the power resistor is in
Ladder-like increasing or decreasing；
The processor is connect with the linear load blocks of the ladder, for controlling multiple function of the linear load blocks of the ladder
Rate relay is successively closed, and corresponding ground connection Leakage Current when each power relay closure is obtained, according to the ground connection
Simultaneously whether display control circuit earth-fault protection function is normal for the variation tendency feature judgement of Leakage Current.
2. the apparatus according to claim 1, which is characterized in that further include display device, for showing the ground connection leakage
The state of electric current.
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-P2For control circuit rated operational voltage, VvFor sampling resistor R12On 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 resistance value of the metal foil sampling resistor is 1 ohm, and the rated operational current or earth leakage current sample circuit are full
Sufficient following relationship：Vi=R1× I=1000 × I (mV), wherein ViFor sampled voltage, I is rated operational current or lets out over the ground
Leakage current, R1For metal foil resistor.
6. the apparatus according to claim 1, which is characterized in that the signal conditioning module 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820362432.0U CN208172173U (en) | 2018-03-16 | 2018-03-16 | A kind of control circuit earth-fault protection function detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820362432.0U CN208172173U (en) | 2018-03-16 | 2018-03-16 | A kind of control circuit earth-fault protection function detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208172173U true CN208172173U (en) | 2018-11-30 |
Family
ID=64375146
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820362432.0U Active CN208172173U (en) | 2018-03-16 | 2018-03-16 | A kind of control circuit earth-fault protection function detection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208172173U (en) |
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2018
- 2018-03-16 CN CN201820362432.0U patent/CN208172173U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190326 Address after: 519000 No. 133 Renmin West Road, Xiangzhou District, Zhuhai City, Guangdong Province Patentee after: Zhuhai Inspection Institute of Guangdong Special Equipment Inspection and Research Institute Address before: 519000 No. 133 Renmin West Road, Xiangzhou District, Zhuhai City, Guangdong Province Co-patentee before: ZHUHAI ANYES TECHNOLOGY CO., LTD. Patentee before: Zhuhai Inspection Institute of Guangdong Special Equipment Inspection and Research Institute |
|
| EE01 | Entry into force of recordation of patent licensing contract | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: ZHUHAI ANYES TECHNOLOGY CO., LTD. Assignor: Zhuhai Inspection Institute of Guangdong Special Equipment Inspection and Research Institute Contract record no.: 2019440000075 Denomination of utility model: Control circuit ground fault protection function detecting device and method Granted publication date: 20181130 License type: Common License Record date: 20190522 |
|
| EE01 | Entry into force of recordation of patent licensing contract | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: ZHUHAI ANYES TECHNOLOGY Co.,Ltd. Assignor: GUANGDONG INSPECTION AND Research Institute OF SPECIAL EQUIPMENT ZHUHAI INSPECTION INSTITUTE Contract record no.: X2021980017429 Denomination of utility model: A detection device for ground fault protection function of control circuit Granted publication date: 20181130 License type: Common License Record date: 20220111 |