CN106443437A - A residual current adjusting device - Google Patents
A residual current adjusting device Download PDFInfo
- Publication number
- CN106443437A CN106443437A CN201611025021.4A CN201611025021A CN106443437A CN 106443437 A CN106443437 A CN 106443437A CN 201611025021 A CN201611025021 A CN 201611025021A CN 106443437 A CN106443437 A CN 106443437A
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- China
- Prior art keywords
- residual current
- current adjusting
- adjusting means
- controller
- motor
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- 230000007423 decrease Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 7
- 230000009471 action Effects 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3277—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches
Abstract
The invention discloses a residual current adjusting device comprising a waveform generator and an adjustable resistor. An adjustable resistor is arranged between the waveform generator and any phase of a three-phase alternating current connected to a residual current adjusting device to be measured; the device further comprises a controller for outputting a corresponding preset control signal in accordance with a control command; and a motor, of which an input terminal is connected with the controller and an output terminal is connected with the adjustable resistor through a rotating shaft. The motor is used to rotate at a corresponding constant speed according to the preset control signal so as to control the adjustable resistor to stably decrease at the constant speed through the rotating shaft. Evidently, in the residual current adjusting device provided by the present invention, the controller outputs the preset control signal corresponding to the control command after receiving the control command, and the preset control signal is used to control the motor to rotate at the corresponding constant speed, thereby further controlling the adjustable resistor to stably decrease at the constant speed to realize a purpose of stable increase of residual currents at the constant speed. The precision is high, and the error is small.
Description
Technical field
The present invention relates to breaker detection technique field, more particularly to a kind of residual current adjusting means.
Background technology
Residual current action breaker can be threaded off when residual current exceedes certain value (action), in order to detect residual current
The drop-away current of action breaker, it is desirable to provide the adjusting means of at the uniform velocity stable increased residual current can be exported.Reality should
Used time is it is desirable to the residual current of residual current adjusting means output is never more than 0.2I △ n (I △ n, rated residual operating current)
Value start to steadily increase, reach corresponding setting in 30s.For different current waveforms it is stipulated that value is different.
For example：Frequency is that during 150Hz, setting is 2.4I △ n；Frequency is that during 400Hz, setting is 6I △ n；Frequency is for advising during 1000Hz
Definite value is：14I△n；During the compound residual current of different frequency, setting is：1.4I△n；Exchange residual current superposition is smooth straight
It is stipulated that being worth and being during stream residual current：I△n；During pulsating direct current residual current superposition smooth direct current residual current, setting is：
1.4I △ n (the residual current adjusting means of I △ n ＞ 0.01A) or 2I △ n (the residual current adjusting means of I △ n≤0.01A)；
During pulsating direct current residual current, setting is：2I△n.Because its stop value of residual current of different wave is different, therefore,
The speed of the stable increase residual current that different residual currents require is different.
Refer to Fig. 1, Fig. 1 is a kind of structural representation of residual current adjusting means of the prior art, this residue electricity
Flow modulation device includes waveform generator and adjustable resistance, and wherein, residual current action breaker is electrically connected with three-phase alternating current, ripple
Shape generator is connected with the arbitrary of three-phase alternating current by adjustable resistance, then the electric current of waveform generator output is remaining electricity
Stream.In prior art, the control method of residual current is manual adjustment adjustable resistance, gradually decreases adjustable electric resistance, but, people
Work adjust adjustable resistance can only realize residual current increase it is impossible to ensure residual current stably at the uniform velocity increase, and governing speed because
People and different, have very big error and uncertainty.
Therefore, a kind of residual current adjusting means solving above-mentioned technical problem how is provided to be those skilled in the art's mesh
The front problem needing to solve.
Content of the invention
It is an object of the invention to provide a kind of residual current adjusting means is it is achieved that the mesh of the stable at the uniform velocity increase of residual current
, and high precision, error is little.
For solving above-mentioned technical problem, the invention provides a kind of residual current adjusting means, include waveform generator with
Adjustable resistance, described adjustable resistance is arranged at described waveform generator and is intersected with the three of residual current adjusting means to be measured connection
In stream electricity between arbitrary phase, this device also includes：
For exporting the controller of correspondingly default control signal according to control instruction；
The motor that input is connected with described controller, output end is connected with described adjustable resistance by rotating shaft, described
Motor is used at the uniform velocity rotating with corresponding speed according to described default control signal, described adjustable will pass through described rotating shaft control
Resistance is at the uniform velocity stable to be reduced.
Preferably, described controller is PLC.
Preferably, described controller is single-chip microcomputer.
Preferably, described motor is stepping motor.
Preferably, this device also includes：
It is arranged at the current sensing means between arbitrary phase in described variable resistor and described three-phase alternating current.
Preferably, described current sensing means is ammeter.
The invention provides a kind of residual current adjusting means, including waveform generator and adjustable resistance, adjustable resistance sets
It is placed in waveform generator and the three-phase alternating current that is connected with residual current adjusting means to be measured between arbitrary phase, this device also wraps
Include the controller for exporting correspondingly default control signal according to control instruction；Input is connected with controller, output end is led to
Cross the motor that rotating shaft is connected with adjustable resistance, motor is used at the uniform velocity rotating with corresponding speed according to default control signal, with
Will pass through rotating shaft and control the at the uniform velocity stable minimizing of adjustable resistance.It can be seen that, in the residual current adjusting means that the present invention provides, controller
Default control signal corresponding with this control instruction can be exported after receiving control instruction, controlled by this default control signal
Motor is at the uniform velocity rotated with corresponding speed, so control adjustable resistance at the uniform velocity stable reduce it is achieved that residual current stably at the uniform velocity
Increased purpose, and high precision, error is little.
Brief description
For the technical scheme being illustrated more clearly that in the embodiment of the present invention, below will be to institute in prior art and embodiment
Need use accompanying drawing be briefly described it should be apparent that, drawings in the following description be only the present invention some enforcement
Example, for those of ordinary skill in the art, on the premise of not paying creative work, can also obtain according to these accompanying drawings
Obtain other accompanying drawings.
Fig. 1 is a kind of structural representation of residual current adjusting means of the prior art；
A kind of structural representation of residual current adjusting means that Fig. 2 provides for the present invention.
Specific embodiment
The core of the present invention is to provide a kind of residual current adjusting means it is achieved that the mesh of the stable at the uniform velocity increase of residual current
, and high precision, error is little.
Purpose, technical scheme and advantage for making the embodiment of the present invention are clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described it is clear that described embodiment is
The a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment being obtained under the premise of not making creative work, broadly falls into the scope of protection of the invention.
Refer to Fig. 2, a kind of structural representation of residual current adjusting means that Fig. 2 provides for the present invention, this device bag
Include waveform generator G and adjustable resistance R, adjustable resistance R is arranged at waveform generator G and is connected with residual current adjusting means to be measured
In the three-phase alternating current connecing between arbitrary phase, this device also includes：
For exporting the controller 1 of correspondingly default control signal according to control instruction；
Specifically, because the corresponding speed difference stably increasing residual current of different electric currents, therefore, it can controlling
The corresponding speed of these electric currents is pre-set, the corresponding correspondingly default control signal of each speed in device 1.
In addition, control instruction here can be user input or waveform generator G output, here of the present invention
It is not particularly limited, enable the purpose of the present invention.
Preferably, controller 1 is PLC.
Preferably, controller 1 is single-chip microcomputer.
Specifically, PLC and single-chip microcomputer all have the advantages that small volume, reliability are high.
Certainly, controller 1 here can also be other kinds of controller, and here of the present invention is not particularly limited,
Enable the purpose of the present invention.
The motor 2 that input is connected with controller 1, output end is connected with adjustable resistance R by rotating shaft, motor 2 is used
In at the uniform velocity rotating with corresponding speed according to default control signal, control the at the uniform velocity stable minimizing of adjustable resistance R will pass through rotating shaft.
Specifically, motor 2 is after receiving default control signal, to carry out with this corresponding speed of default control signal
At the uniform velocity rotate, adjustable resistance R is delivered torque to by rotating shaft, thus realize the at the uniform velocity stable of adjustable resistance R reducing it is achieved that remaining
The stable of aftercurrent at the uniform velocity increases.
Preferably, motor 2 is stepping motor.
Stepping motor is a kind of electromechanical compo that electric impulse signal is converted into angular displacement or displacement of the lines.Can be by control
Pulse number processed controlling angular displacement, thus reaching the purpose being accurately positioned；Can be controlled by controlling pulse frequency simultaneously
Speed and acceleration that stepping motor processed rotates, thus reach the purpose of speed governing.Under normal circumstances, its each rotation has admittedly
Fixed step number；When doing continuous step motion, its rotating speed keeps strict corresponding relation with the frequency of input pulse, is not subject to voltage wave
The impact that dynamic and load changes.
When motor 2 is stepping motor, then default control signal is in the nature predetermined pulse, and this device passes through motor
2 at the uniform velocity rotation is it is achieved that the change in resistance of precise control adjustable resistance R.Residual current due to different wave stably increases
Speed different, the rate requirement that controller 1 can be worth according to the rules, the residual current of different wave stably increases is different, in advance
Set various pulse frequencies, it is corresponding with the speed that corresponding residual current stably increases to carry out different rotation rates, realize different
The speed of the stable at the uniform velocity increase of the residual current of waveform reaches standard gauge provisioning request.
Certainly, motor 2 here can also be other kinds of motor, and here of the present invention is not particularly limited,
Determined according to actual conditions.
Preferably, this device also includes：
It is arranged at the current sensing means between arbitrary phase in variable resistor and three-phase alternating current.
The application detects residual current by arranging current sensing means, facilitates the monitoring of staff.
Preferably, current sensing means is electric current Table A.
Certainly, current sensing means here can also adopt other types, enables the purpose of the present invention.
The invention provides a kind of residual current adjusting means, including waveform generator and adjustable resistance, adjustable resistance sets
It is placed in waveform generator and the three-phase alternating current that is connected with residual current adjusting means to be measured between arbitrary phase, this device also wraps
Include the controller for exporting correspondingly default control signal according to control instruction；Input is connected with controller, output end is led to
Cross the motor that rotating shaft is connected with adjustable resistance, motor is used at the uniform velocity rotating with corresponding speed according to default control signal, with
Will pass through rotating shaft and control the at the uniform velocity stable minimizing of adjustable resistance.It can be seen that, in the residual current adjusting means that the present invention provides, controller
Default control signal corresponding with this control instruction can be exported after receiving control instruction, controlled by this default control signal
Motor is at the uniform velocity rotated with corresponding speed, so control adjustable resistance at the uniform velocity stable reduce it is achieved that residual current stably at the uniform velocity
Increased purpose, and high precision, error is little.
It should be noted that in this manual, term " inclusion ", "comprising" or its any other variant are intended to
Comprising of nonexcludability, wants so that including a series of process of key elements, method, article or equipment and not only including those
Element, but also include other key elements being not expressly set out, or also include for this process, method, article or equipment
Intrinsic key element.In the absence of more restrictions, the key element that limited by sentence "including a ..." it is not excluded that
Also there is other identical element including in the process of described key element, method, article or equipment.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses the present invention.
Multiple modifications to these embodiments will be apparent from for those skilled in the art, as defined herein
General Principle can be realized without departing from the spirit or scope of the present invention in other embodiments.Therefore, the present invention
It is not intended to be limited to the embodiments shown herein, and be to fit to and principles disclosed herein and features of novelty phase one
The scope the widest causing.
Claims (6)
1. a kind of residual current adjusting means, including waveform generator and adjustable resistance, described adjustable resistance is arranged at described ripple
It is characterised in that this dress between arbitrary phase in shape generator and the three-phase alternating current that is connected with residual current adjusting means to be measured
Put and also include：
For exporting the controller of correspondingly default control signal according to control instruction；
The motor that input is connected with described controller, output end is connected with described adjustable resistance by rotating shaft, described electronic
Machine is used at the uniform velocity rotating with corresponding speed according to described default control signal, controls described adjustable resistance will pass through described rotating shaft
At the uniform velocity stable minimizing.
2. residual current adjusting means as claimed in claim 1 is it is characterised in that described controller is PLC.
3. residual current adjusting means as claimed in claim 1 is it is characterised in that described controller is single-chip microcomputer.
4. residual current adjusting means as claimed in claim 2 is it is characterised in that described motor is stepping motor.
5. residual current adjusting means as claimed in claim 1 is it is characterised in that this device also includes：
It is arranged at the current sensing means between arbitrary phase in described variable resistor and described three-phase alternating current.
6. residual current adjusting means as claimed in claim 5 is it is characterised in that described current sensing means is ammeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611025021.4A CN106443437A (en) | 2016-11-16 | 2016-11-16 | A residual current adjusting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611025021.4A CN106443437A (en) | 2016-11-16 | 2016-11-16 | A residual current adjusting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106443437A true CN106443437A (en) | 2017-02-22 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611025021.4A Pending CN106443437A (en) | 2016-11-16 | 2016-11-16 | A residual current adjusting device |
Country Status (1)
| Country | Link |
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| CN (1) | CN106443437A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107359593A (en) * | 2017-08-30 | 2017-11-17 | 浙江巨磁智能技术有限公司 | Intelligent Type B residual current protection switch |
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| CN2226507Y (en) * | 1995-03-07 | 1996-05-08 | 张亚军 | Electric current telecontrol regulator for AC and DC welder welding |
| CN1518207A (en) * | 2003-01-14 | 2004-08-04 | ������������ʽ���� | Current control circuit and motor drive circuit |
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