CN103545788A - System for conducting accurate current control by means of digital-display ampere meter - Google Patents
System for conducting accurate current control by means of digital-display ampere meter Download PDFInfo
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- CN103545788A CN103545788A CN201310518849.3A CN201310518849A CN103545788A CN 103545788 A CN103545788 A CN 103545788A CN 201310518849 A CN201310518849 A CN 201310518849A CN 103545788 A CN103545788 A CN 103545788A
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Abstract
The invention provides a system for conducting accurate current control by means of a digital-display ampere meter. The system for conducting the accurate current control by means of the digital-display ampere meter comprises the three-phase digital-display ampere meter, a set of current transformers which comprises three current transformers, a set of load contactors and a set of air switches, wherein the three-phase digital-display ampere meter has the upper-limit current and the lower-limit current and is provided with a normally-open alarm output point and a normally-closed alarm output point. The system for conducting the accurate current control by means of the digital-display ampere meter is characterized in that the system further comprises a load contactor or an air-switching releaser, and a load is controlled to stop working through action of the upper-limit normally-closed alarm output point and the normally-open alarm output point and the load contactor or the air-switching releaser. According to the system for conducting the accurate current control by means of the digital-display ampere meter, the current on a circuit can be controlled accurately to further control the current needed by the load, and then normal operation of an electric appliance is guaranteed. The system for conducting the accurate current control by means of the digital-display ampere meter has the advantages that components and parts are cheap and the structure is simple.
Description
Technical field
The present invention relates to a kind of system of carrying out the accurate control of electric current with digital display ammeter that electric power system is used, belong to electrical equipment technical field.
Background technology
Have at present a lot of equipment requirements overcurrent not move, overcurrent operation easily causes equipment heating, for example motor.Some firing equipment is because voltage is low simultaneously, and also easy overcurrent, causes that circuit is overheated, causes line or circuit on fire, causes fire.And the electrical equipment of controlling at present overcurrent mostly is thermal overload relay and air switch, their operation principle is all to lean on the heating effect of current of thermal element and bimetal leaf to disconnect the problem that main line controller reaches control current overload.
The patent of invention < < overcurrent protective device > > that for example patent No. is 200910150989.3, discloses a kind of overcurrent protective device.It comprises: the first overcurrent relay, and it has at the above turn-off current supply circuit of the first temperature, at the first bimetallic contact chip lower than the first temperature and that restore electricity higher than the temperature of 0 ℃; The second overcurrent relay, itself and the first overcurrent relay are connected in series, and disconnect to the power supply circuits of motor compressor power supply the second bimetallic contact chip only restoring electricity in the temperature lower than 0 ℃ more than the second temperature higher than the first temperature.Yet this control mode is because the heating effect of current reaction of thermal element and sheet metal is slow, and regulating error is large, often goes wrong in reality.
In view of this, be necessary to provide a kind of and carry out with digital display ammeter the system that electric current is accurately controlled, to address the above problem.
Summary of the invention
The object of the invention is: the technical problem existing for solving known technology, provide a kind of and carry out with digital display ammeter the system that electric current is accurately controlled, carry out the required electric current of control load, guarantee electric normal operation.
The technical solution adopted in the present invention is: a kind of system of carrying out the accurate control of electric current with digital display ammeter, comprise one group of one of three-phase digital display ammeter, one group totally three of current transformers, one group, load contactor and air switch, three current transformers by copper cash together with three phase ammeter respective terminal sub-connection, load power source circuit is through three current transformer holes and air switch, A.C. contactor is connected, the electric current setting of described three-phase current watchband bound and often open, normally closed warning output point, it is characterized in that
Described system also comprises a load contactor, load contactor is located at three phase ammeter side, the normally closed point of ammeter upper limit alarm string is above load contactor control coil, three phase ammeter is set to the maximum required value of load, when load current reaches the maximum of ammeter setting, the normally closed point of ammeter upper limit alarm disconnects, load contactor coil dead electricity, the load contactor main contacts being connected with load disconnects, and load quits work; Or
Described system also comprises that a sky drives release, sky is driven release and is connected with air switch, ammeter upper limit alarm is often made war to go here and there and is opened in release control circuit at sky, three phase ammeter is set to the maximum required value of load, when load current reaches the maximum that ammeter sets, and the ammeter upper limit alarm closure of often making war, sky is opened release device coil and is obtained electric, sky is opened release action, and air switch disconnects, and load quits work.
The invention has the beneficial effects as follows: by taking the system of the upper size of current of a set of accurate control circuit, carry out the required electric current of control load, guarantee electric normal operation.It is cheap that this control system has components and parts, easily buys, and implement advantage easily.
Accompanying drawing explanation
Fig. 1 be first embodiment of the invention with ammeter, carry out the circuit theory diagrams of the system that electric current accurately controls.
Fig. 2 be second embodiment of the invention with ammeter, carry out the circuit theory diagrams of the system that electric current accurately controls.
Embodiment
In order to understand better the present invention, below in conjunction with embodiment, further illustrate content of the present invention, but content of the present invention is not only confined to the following examples.Those skilled in the art can make various changes or modifications the present invention, and these equivalent form of values are equally within the listed claims limited range of the application.
Symbol description in accompanying drawing: 10-three phase ammeter; 11-removes control circuit; 12-sky is driven release; The ABC three-phase of L1, L2, L3-three-phase circuit; B1, B2, B3-current transformer; The main contacts of KM-load contactor; 9-load contactor control coil; QS-air switch.
Fig. 1 be first embodiment of the invention with digital display ammeter, carry out the circuit theory diagrams of the system that electric current accurately controls.In figure, ammeter 10 is three-phase digital display ammeter, band bound electric current setting and often open, normally closed warning output point.Components and parts also comprise, with three of the approaching current transformers of load rating electric current, one, load contactor.
Control mode in Fig. 1: load main power line is passed to current transformer, with copper cash, current transformer is connect to electricity together with ammeter respective terminal sub-connection, by the normally closed point of ammeter upper limit alarm string above load contactor control coil, ammeter is set to the maximum required value of load, when load current reaches the maximum of ammeter setting, the normally closed point of ammeter upper limit alarm disconnects, load contactor coil dead electricity, load contactor main contacts disconnects, and load quits work.
Fig. 2 be second embodiment of the invention with digital display ammeter, carry out the circuit theory diagrams of the system that electric current accurately controls.In figure, ammeter 10 is three-phase digital display ammeter, band bound electric current setting and often open, normally closed warning output point.Components and parts also comprise, with three of the approaching current transformers of load rating electric current, sky is driven one of release.
Control mode in Fig. 2: load main power line is passed to current transformer, with copper cash, instrument transformer is connect to electricity together with ammeter respective terminal sub-connection, ammeter upper limit alarm is often made war to go here and there and at sky, open in release control circuit, ammeter is set to the maximum required value of load, when load current reaches the maximum that ammeter sets, the ammeter upper limit alarm closure of often making war, release device coil obtains electric, release action, sky cut-offs out, and load quits work.
These are only embodiments of the invention, be not limited to the present invention, therefore, within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in claim scope of the present invention.
Claims (1)
1. one kind is carried out with digital display ammeter the system that electric current is accurately controlled, comprise one group of one of three-phase digital display ammeter, one group totally three of current transformers, one group, load contactor and air switch, three current transformers by copper cash together with three phase ammeter respective terminal sub-connection, load power source circuit is connected with air switch, A.C. contactor through three current transformer holes, described three-phase digital display ammeter band bound electric current setting and often open, normally closed warning output point, it is characterized in that:
Described system also comprises a load contactor, load contactor is located at three-phase digital display ammeter side, the normally closed point of ammeter upper limit alarm string is above load contactor control coil, three phase ammeter is set to the maximum required value of load, when load current reaches the maximum of ammeter setting, the normally closed point of ammeter upper limit alarm disconnects, load contactor coil dead electricity, the A.C. contactor main contacts being connected with load disconnects, and load quits work; Or
Described system also comprises that a sky drives release; sky is driven release and is connected with air switch protection mechanism; ammeter upper limit alarm is often made war to go here and there and is opened in release control circuit at sky; three phase ammeter is set to the maximum required value of load, when load current reaches the maximum that ammeter sets, and the ammeter upper limit alarm closure of often making war; sky is opened trip coil and is obtained electric; sky is opened release action, and air switch disconnects, and load quits work.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310518849.3A CN103545788A (en) | 2013-10-29 | 2013-10-29 | System for conducting accurate current control by means of digital-display ampere meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310518849.3A CN103545788A (en) | 2013-10-29 | 2013-10-29 | System for conducting accurate current control by means of digital-display ampere meter |
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|---|---|
| CN103545788A true CN103545788A (en) | 2014-01-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310518849.3A Pending CN103545788A (en) | 2013-10-29 | 2013-10-29 | System for conducting accurate current control by means of digital-display ampere meter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108064090A (en) * | 2017-12-31 | 2018-05-22 | 广州市大弘自动化科技有限公司 | A kind of electric heating system |
-
2013
- 2013-10-29 CN CN201310518849.3A patent/CN103545788A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108064090A (en) * | 2017-12-31 | 2018-05-22 | 广州市大弘自动化科技有限公司 | A kind of electric heating system |
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| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140129 |