CN203423479U - Miniature low-voltage motor integrated protection device - Google Patents
Miniature low-voltage motor integrated protection device Download PDFInfo
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- CN203423479U CN203423479U CN201320557911.5U CN201320557911U CN203423479U CN 203423479 U CN203423479 U CN 203423479U CN 201320557911 U CN201320557911 U CN 201320557911U CN 203423479 U CN203423479 U CN 203423479U
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Abstract
The utility model relates to a miniature low-voltage motor integrated protection device, comprising a host and a special-purpose mutual inductor, wherein the special-purpose mutual inductor includes a secondary mutual inductor and a primary mutual inductor which are integrated together, and the host is connected with the special-purpose mutual inductor through a shield cable. A control module and a display module are integrated into the host, the host has no secondary mutual inductor, the display module is connected with the control module and receives and displays the display data transmitted by the control module, and the weak current signals output by the special-purpose mutual inductor are transmitted to the control module through a shield cable. According to the device, under the precondition that performance is prevented from being impaired, the device solves the problems that the size is too large and installation space is too small in the prior art, the host has no secondary mutual inductor, external interference caused by the mutual inductor is prevented, and the design difficulty in the anti-interference aspect is reduced.
Description
Technical field
The utility model relates to low-tension motor protection and measurement and control area, specifically refers to a kind of Miniature low-voltage comprehensive protecting device for motor.
Background technology
Current microcomputer and microcontroller are in the control protection field extensive use of low-tension motor.This equipment that relaying protection, motor running condition are measured and automatic control motor operation stops of realizing for low-tension motor is referred to as low voltage motor comprehensive protector (abbreviation low-voltage comprehensive-protection).
Relatively, low-voltage comprehensive-protection is basic identical on hardware configuration, conventionally mainly comprises display module, host module, switching value input/output module, analog input and output module and communication module with high-voltage complex protection device (be called for short high pressure and combine guarantor).In the use that high pressure combine to be protected, generally switch cubicle fills a set of high pressure and combines and protect, and the space of installation is larger, so generally except analog input module, other modules are contained in a set of cabinet.For analog input, through two-stage conversion, the on-the-spot instrument transformer of the first order is outside the comprehensive guarantor of high pressure, and second level instrument transformer is positioned at cabinet inside.This structure is referred to as integrative-structure.
For loop in practical application, for reducing investment, often a low-voltage cabinet will be installed many cover low-voltage comprehensive-protections, every time low tension loop for low capacity, often configuration size is the drawer of low-voltage switch cabinet interval of the miniaturizations such as drawer partition that 1/2 drawer, 125mm that 200mm is high are high, and this causes the free space in drawer of low-voltage switch cabinet interval greatly to dwindle.Some low tension loops also can increase shelves configuration to parts such as breaker of plastic casing, A.C. contactors, and this also will cause the free space in drawer of low-voltage switch cabinet interval greatly to dwindle.Therefore,, for the structural design of Micro-Processor Protection Device for Low Voltage Motors, must accomplish multiple functional, miniaturized structure, Installation and Debugging are convenient no matter is display module or control module, all should do Miniaturization Design.
Based on above analysis, low-voltage comprehensive-protection and high pressure combine to be protected has following otherness: the one, and structural design is more reasonable, accomplishes not reduce function and increases on jamproof basis, as far as possible little the and compression installing space of volume; The 2nd,, high pressure is combined to the two-stage instrument transformer of protecting and be compressed into one-level instrument transformer; The 3rd,, host module is separated with instrument transformer, form a kind of new Split type structure and combine guarantor.This patent is exactly based on These characteristics, the comprehensive protection device that is suitable for low-pressure system of designing and Implementing, a protection difficult problem for solution low-pressure system.
Utility model content
The purpose of this utility model is to provide the Micro-Processor Protection Device for Low Voltage Motors of a kind of main frame miniaturization separated with instrument transformer; do not reducing or reducing on the function of conventional Micro-Processor Protection Device for Low Voltage Motors and the basis of performance, solving a difficult problem for Micro-Processor Protection Device for Low Voltage Motors Miniaturization Design.
In order to achieve the above object, main design thought of the present utility model is:
Secondary instrument transformer is separated, and isolated secondary instrument transformer and an instrument transformer are integrated, Special mutual-inductor formed.
Display module and control module are designed to indivisible integral body on a space, form main frame and be arranged on the panel of low voltage drawer.
The low voltage motor comprehensive protector of conceptual design is divided into main frame and two parts of Special mutual-inductor like this, these two parts by shielded type cable as connection.
Special mutual-inductor has been integrated secondary instrument transformer and an instrument transformer, and an analog signals (electric current, voltage) of distribution drawer is converted to weak voltage signal by Special mutual-inductor, and transfers to main frame by shielded type cable.
Main frame receives the weak voltage signal of Special mutual-inductor conversion transmission by this shielded type cable, and the calculating of sampling.
Because secondary instrument transformer is no longer arranged in the main frame of Micro-Processor Protection Device for Low Voltage Motors, therefore can reduce the interior large quantity space of main frame of Micro-Processor Protection Device for Low Voltage Motors; Isolate secondary instrument transformer has also reduced because instrument transformer is brought the electromagnetic interference in the main frame of Micro-Processor Protection Device for Low Voltage Motors into simultaneously.
Isolated secondary instrument transformer and an instrument transformer are combined, make it compare a conventional required installing space of instrument transformer and greatly reduce on the contrary.Because this kind of instrument transformer only need to be for Micro-Processor Protection Device for Low Voltage Motors provides signal, its capacity is far smaller than a conventional instrument transformer, and institute takes up space and is also less than a shared space of instrument transformer of routine.
The main technical schemes that the utility model adopts is:
A kind of Miniature low-voltage comprehensive protecting device for motor; it comprises: main frame and secondary instrument transformer and instrument transformer are integrated to the Special mutual-inductor forming; the described main frame being separated from each other is connected by shielded type cable with Special mutual-inductor; wherein; described main frame is integrated with control module and display module; described display module is connected and receives the demonstration data that control module sends and shows with control module; and; in described main frame, be not provided with secondary instrument transformer, the weak electric signal of described Special mutual-inductor output reaches control module by shielded type cable.
Wherein, be provided with an encapsulated space in described Special mutual-inductor, be wherein packaged with current transformer and voltage transformer, the weak voltage signal of constant current of described current transformer and voltage transformer output reaches control module by shielded type cable.
Wherein, described current transformer is provided with primary side cable, circular iron core, secondary side winding and terminal resistance, described primary side cable adopts core-theaded type cordless that the running current of low-tension motor is changed to voltage signal a little less than described constant current, described terminal resistance is parallel to the two ends of secondary side winding to obtain the weak voltage signal linear with the current signal of primary side cable, and described terminal resistance is provided with the signal output part being connected with shielded type cable.
Be preferably, described current transformer is three groups, and three groups of current transformers are separate, and distinguishes corresponding A, B, C three-phase.
Wherein, described voltage transformer comprises winding, square ring iron core, secondary winding and terminal resistance one time, the two ends of a described winding are provided with the voltage incoming end of the line voltage signal in the low-voltage distribution loop of accessing low-tension motor, described terminal resistance is parallel to the two ends of secondary winding to obtain the weak voltage signal linear with the voltage signal of a winding, and described terminal resistance is provided with the signal output part being connected with shielded type cable.
Be preferably, described voltage transformer is three groups, and three groups of voltage transformers are separate, and distinguishes corresponding A, B, C three-phase.
Above-mentioned any Micro-Processor Protection Device for Low Voltage Motors, wherein, is also integrated with in described main frame and is connected with control module:
For the weak voltage signal that Special mutual-inductor transmission is come, be sent to the analog input module of control module;
Be used for according to the analog output module of analog input amount or amount of calculation output 4～20mA continuous current signal;
For detection of the pre-buried semistor resistance of motor, calculate the temperature value of motor winding and transfer to the PTC temperature collect module of control module;
The open and-shut mode of the switching value node of inputting for detection of outside is also converted to by outside switching value signal the switching input module that digital quantity level signal transfers to control module;
The switching value output module of controlling external equipment is carried out to switching value output for the digital quantity level signal of control module output being converted to the open and-shut mode of relay auxiliary contact;
For recording the failure wave-recording module of the data variation of the electric parameter of motor before and after breaking down, for recording the data of the variation of the electric parameter of motor before and after breaking down;
Be used for realizing with external communication device the communication module of serial communication; With
For inputting the keyboard input module that comprises display mode configuration information and inner parameter configuration information.
Wherein, the power module of integrated promising its power supply also in described main frame, described power module comprises 8 groups of separate power supplys, each power supply is connected with one or several module in control module, analog input module, analog output module, PTC temperature collect module, switching input module, switching value output module, failure wave-recording module, communication module, display module and keyboard input module respectively, for realizing, each module in described main frame is powered.
Wherein, described control module is micro controller module, and described micro controller module comprises highly integrated multi-functional microcontroller chip, and difference connected reset circuit, hardware clock circuit and E
2rOM circuit, for realizing the sampling of each input and output and other functional module, calculating, control, recording and interconnect.
Wherein, described analog input module comprises passive filter circuit and the active filter circuit that the weak voltage signal for Special mutual-inductor transmission is come carries out filtering before being sent to control module;
Described analog output module comprise signal conversion and the circuit that keeps so that 4～20mA continuous current signal stabilization of institute's bringing onto load output while being no more than 500 ohm and linear adjustable, for realizing analog input amount or the incidence relation output 4～20mA DC current signal of amount of calculation to analog output module from control module, constant current output 4～20mA DC current signal, the maximum load of being with is 500 ohm, and linear adjustable;
Described PTC temperature collect module comprises that signal conversion and holding circuit, to the signal after conversion is transferred to control module, calculate the temperature value of motor winding for detection of the pre-buried semistor resistance of motor;
Described switching input module comprises for outside switching value signal being converted to current-limiting circuit and the photoelectric coupling circuit of digital quantity level signal, the open and-shut mode of the switching value node of inputting for detection of outside;
Described switching value output module comprises enable circuits, photoelectric coupling circuit, relay drive circuit, the digital quantity level signal of control module output is converted to the open and-shut mode of relay auxiliary contact, for external equipment being carried out to the control of switching value output;
Described communication module comprises communication level conversion correction circuit, for realizing the serial communication with external communication device;
Described display module comprises Liquid Crystal Module, display control chip and reset circuit, is connected with control module, receives the demonstration data that control module sends, and realizes the various data display functions to Micro-Processor Protection Device for Low Voltage Motors;
Described keyboard input module comprises key circuit and de-twitter circuit, is connected with control module, by external key, realizes the input function that display mode, inner parameter to Micro-Processor Protection Device for Low Voltage Motors such as arranges at the information.
Be preferably; described communication module is also provided with the expansion interface for other communication modes by outside serial communication and external equipment communication connection; when Micro-Processor Protection Device for Low Voltage Motors is connected with electric power monitoring system by realizing the interface of serial communication or expansion interface, electric power monitoring system can realize that definite value is revised in distant place switching, a distant place to Micro-Processor Protection Device for Low Voltage Motors, distant place alarm signal resets.
The beneficial effects of the utility model are mainly to have following two advantages:
The one,, the secondary instrument transformer in the main frame of motor Protective Device is separated, greatly reduced the inner space of main frame.The electromagnetic interference of bringing in Micro-Processor Protection Device for Low Voltage Motors due to secondary instrument transformer in addition reduces greatly, also makes described main frame accomplish Miniaturization Design under the prerequisite that does not reduce function and EMC performance.
The 2nd,, from secondary instrument transformer and the instrument transformer separated in the main frame of motor Protective Device, to integrate, the more conventional instrument transformer of Special mutual-inductor installing space demand after integration is installed greatly reduction.In addition, Special mutual-inductor after integration has formed closed loop because its secondary side series resistance makes instrument transformer secondary coil, Special mutual-inductor can not cause instrument transformer secondary side to be opened a way while interrupting by the electrical connection of signal shielding cable and described main frame, has certain fail safe.
Thus, the desirable solution of the utility model a difficult problem for low voltage motor comprehensive protector Miniaturization Design.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram of an embodiment of the utility model;
Fig. 2 is the micro controller module figure in embodiment of the utility model;
Fig. 3 is the current transformer schematic diagram of the Special mutual-inductor in embodiment of the utility model;
Fig. 4 is the voltage transformer schematic diagram of the Special mutual-inductor in embodiment of the utility model.
Embodiment
Below in conjunction with drawings and Examples, embodiment of the present utility model is described in further detail.Following examples are used for illustrating the utility model, but are not used for limiting scope of the present utility model.
Below in conjunction with Fig. 1, Miniature low-voltage motor protecting device of the present utility model is described in detail.Fig. 1 is the overall structure schematic diagram of a kind of Miniature low-voltage motor protecting device of the utility model embodiment.
As shown in Figure 1, Miniature low-voltage motor protecting device, is mainly divided into two parts of main frame and Special mutual-inductor, and these two parts are connected by shielded type cable.Special mutual-inductor is transformed to weak voltage signal by the operating current of low-tension motor and voltage signal and by shielded type cable, is input to the sampling module of main frame; the micro controller module of main frame carries out computational analysis processing by the signal of sampling module filter transmission, realizes and realizes the defencive function under fault to the measurement of the analog quantity of low-tension motor and to low voltage motor.
Main frame comprises with lower module: power module, micro controller module, analog input module, analog output module, PTC temperature collect module, switching input module, switching value output module, failure wave-recording module, communication module, display module and keyboard input module.
Power module power taking from low-voltage bus bar or other normal power supplies, input supply voltage is for exchanging 90～250V/50HZ or direct current 110V/220V.8 groups of other modules of supplying with in main frame of the exportable separate DC power supply of power module are used.
As shown in Figure 2, micro controller module adopts multi-functional microcontroller chip, the functions such as large capacity internal storage (RAM, FLASH), A/D sampling functions, GPIO port, COM port that it is integrated.In micro controller module, also comprise for realizing the automatically reset circuit of multi-functional microcontroller chip, hardware clock circuit and outside E
2rOM memory.Micro controller module is for the treatment of the signal that calculates other module and transmit, and by prefabricated switching motion logic realization to the composite measurement of motor and defencive function.
Analog input module adopts low pass passive filter as the front-end processing of sampled signal, then does by operational amplifier LM248 the sample port of delivering to micro controller module after active power filtering and signal adjustment, for its sampling and computing.
The signal that analog output module is come by the PWM technical transmission of micro controller module is by the adjustment output DC current signal (4～20mA signal) of operational amplifier, this DC current signal keeps when load is less than 500 ohm that output current value is constant and direct proportion changes with the variation of associated input analog amount signal, and its upper and lower amplitude is adjustable by inner parameter linearity.
PTC temperature collect module is connected with micro controller module for detecting detecting the motor temperature of motor.
Switching input module is transferred to micro controller module by photoelectric coupling chip by the open and-shut mode of outside switch and judges for comprehensive control and protection logic.
Switching value output module receives the control signal that micro controller module sends, by photoelectric coupling chip and drive circuit, drive relay coil make relay auxiliary contact closure or open, for external equipment being controlled or is connected to the actuator of distribution loop, carry out the tripping operation action under low voltage motor fault.
Failure wave-recording module; be connected with micro controller module; for recording the variation of the electric parameter of motor before and after breaking down, failure wave-recording function can be when system breaks down, automatically; the situation of change of the various electric parameters of process before and after record trouble exactly; by to these electric quantitative analyses, compare, to analyzing and processing accident; whether judgement protects correct operation, to improving safe operation of power system level, all plays an important role.
Communication module provides RS485 communication expansion interface and CAN or Profibus interface, for being connected of external equipment, is connected with electric power monitoring system, realize distant place switching, definite value, the reset of distant place alarm signal are revised in a distant place.
Display module comprises liquid crystal board and display driver chip, and the information exchange that micro controller module shows needs is crossed I
2c bus sends to display driver chip, and display driver chip carries out corresponding character demonstration and corresponding display mode adjustment according to the information-driven liquid crystal board receiving.
Button in keyboard input module is connected with micro controller module after de-twitter circuit is processed, for control Liquid Crystal Module display mode and displaying contents, the parameter of motor Protective Device is set.
In described Special mutual-inductor, be provided with current transformer, voltage transformer, terminal resistance, shielded type cable, with complete being encapsulated in a unified space of upper-part.Special mutual-inductor can directly be inputted a running current of low voltage motor, a working voltage, and is transformed to weak voltage signal, by shielded type cable, is connected to main frame, for main frame sample, calculating and logic control.
As shown in Figure 3, the current transformer of described Special mutual-inductor mainly forms 5 by circular unshakable in one's determination 2, secondary winding 3, shielded type cable.Primary side 1 input signal is current signal, and current mutual inductor coil adopts the current load on the power cable in core-theaded type cordless induction low-voltage distribution loop, by exporting the current signal to strain ratio in secondary winding after the conversion of current transformer.And at resistance of secondary windings in series and the suitable resistance 4 of power of current transformer, can obtain in the two ends of this resistance the weak voltage signal linear with the current signal (amplitude, frequency, phase place) of primary side induction.Signal shielding cable by suitable length can transfer to described main frame by this weak voltage signal.Described current transformer is divided into three groups, and the input of three groups of current transformers and conversion end 6 are separate, can to A, B, C three-phase current load, convert respectively.
As shown in Figure 4, the voltage transformer of described Special mutual-inductor is mainly comprised of square ring iron core 12, winding 11, secondary winding 13, a shielded type cable 15.One time winding side joint enters the line voltage signal in low-voltage distribution loop, after converting by voltage transformer, in secondary winding, export the current signal to strain ratio, and at resistance of secondary windings in series and the suitable resistance 14 of power of voltage transformer, can obtain in the two ends of this resistance the weak voltage signal linear with the voltage signal (amplitude, frequency, phase place) of primary side induction.Signal shielding cable by suitable length can transfer to this signal described main frame.Described voltage transformer is divided into three groups, and the input 10 of three groups of voltage transformers and conversion end 16 are separate, can to A, B, C three-phase voltage, convert respectively.
Special mutual-inductor has been integrated once and secondary current instrument transformer and voltage transformer, and three current transformers, three voltage transformers are integrated in the space of an integrally closed.The running current of low voltage motor and working voltage are that weak voltage signal is by the analog input module of shielded type cable access host by Special mutual-inductor Direct Transform.The running current input of low voltage motor adopts punching mode, and working voltage directly accesses the voltage input end of Special mutual-inductor.For corresponding different capabilities low voltage motor and distribution loop, the specified input AC electric current of Special mutual-inductor is divided into 11 grades, and specified input ac voltage effective value is 220V, and specified output AC voltage signal effective value is 300mV.Special mutual-inductor, for coordinating the requirements of installation space of different capabilities motor distribution loop, is divided into third gear by punching aperture.The punching aperture of the Special mutual-inductor that specified input current is less is less, otherwise larger.Refer to table 1.
Table 1 Special mutual-inductor technical parameter table
In Special mutual-inductor, also have a kind of instrument transformer that is specifically designed to measurement leakage current or little electric current to be called special-purpose leakage current transformer, its composition and with main frame be connected and main frame basic identical to the processing of its output signal and above-mentioned Special mutual-inductor, except part technical parameter different.Refer to table 2
The special-purpose leakage current transformer technical parameter of table 2 table
As can be seen from the above embodiments, the embodiment of the present invention is by adopting the main frame design separated with instrument transformer, do not reducing or reducing on the function of motor Protective Device and the basis of performance, solved the contradiction (overall dimension of main frame can be 96mm * 56mm * 100mm, and the overall dimension of Special mutual-inductor can be 56mm * 56mm * 100mm) of motor Protective Device volume and installing space; By integrating primary current instrument transformer and voltage transformer, simplified the installation and maintenance work of current transformer, effectively reduce the lower deployment cost of motor Protective Device.
The above is only the preferred embodiment of the present invention; should be understood that; for those skilled in the art; do not departing under the prerequisite of the technology of the present invention principle; can also make some variations, reduction, increase, improvement, these variations, reduction, increase, improvement also should be considered as protection scope of the present invention.
Claims (10)
1. a Miniature low-voltage comprehensive protecting device for motor; it is characterized in that; comprise: main frame and secondary instrument transformer and instrument transformer are integrated to the Special mutual-inductor forming; the described main frame being separated from each other is connected by shielded type cable with Special mutual-inductor; wherein; described main frame is integrated with control module and display module; described display module is connected and receives the demonstration data that control module sends and shows with control module; and; in described main frame, be not provided with secondary instrument transformer, the weak electric signal of described Special mutual-inductor output reaches control module by shielded type cable.
2. Micro-Processor Protection Device for Low Voltage Motors as claimed in claim 1; it is characterized in that: in described Special mutual-inductor, be provided with an encapsulated space; wherein be packaged with current transformer and voltage transformer, the weak voltage signal of constant current of described current transformer and voltage transformer output reaches control module by shielded type cable.
3. Micro-Processor Protection Device for Low Voltage Motors as claimed in claim 2; it is characterized in that: described current transformer is provided with primary side cable, circular iron core, secondary side winding and terminal resistance; described primary side cable adopts core-theaded type cordless that the running current of low-tension motor is changed to voltage signal a little less than described constant current; described terminal resistance is parallel to the two ends of secondary side winding to obtain the weak voltage signal linear with the current signal of primary side cable, and described terminal resistance is provided with the signal output part being connected with shielded type cable.
4. Micro-Processor Protection Device for Low Voltage Motors as claimed in claim 3, is characterized in that: described current transformer is three groups, and three groups of current transformers are separate, and distinguishes corresponding A, B, C three-phase.
5. Micro-Processor Protection Device for Low Voltage Motors as claimed in claim 2; it is characterized in that: described voltage transformer comprises winding, square ring iron core, secondary winding and terminal resistance one time; the two ends of a described winding are provided with the voltage incoming end of the line voltage signal in the low-voltage distribution loop of accessing low-tension motor; described terminal resistance is parallel to the two ends of secondary winding to obtain the weak voltage signal linear with the voltage signal of a winding, and described terminal resistance is provided with the signal output part being connected with shielded type cable.
6. Micro-Processor Protection Device for Low Voltage Motors as claimed in claim 5, is characterized in that: described voltage transformer is three groups, and three groups of voltage transformers are separate, and distinguishes corresponding A, B, C three-phase.
7. the Micro-Processor Protection Device for Low Voltage Motors as described in claim 1,2,3,4,5 or 6, is characterized in that, is also integrated with to be connected with control module in described main frame:
For the weak voltage signal that Special mutual-inductor transmission is come, be sent to the analog input module of control module;
Be used for according to the analog output module of analog input amount or amount of calculation output 4～20mA continuous current signal;
For detection of the pre-buried semistor resistance of motor, calculate the temperature value of motor winding and transfer to the PTC temperature collect module of control module;
The open and-shut mode of the switching value node of inputting for detection of outside is also converted to by outside switching value signal the switching input module that digital quantity level signal transfers to control module;
The switching value output module of controlling external equipment is carried out to switching value output for the digital quantity level signal of control module output being converted to the open and-shut mode of relay auxiliary contact;
For recording the failure wave-recording module of the data variation of the electric parameter of motor before and after breaking down;
Be used for mainly realizing with external communication device the communication module of serial communication; With
For inputting the keyboard input module that comprises display mode configuration information and inner parameter configuration information.
8. Micro-Processor Protection Device for Low Voltage Motors as claimed in claim 7; it is characterized in that; the power module of integrated promising its power supply also in described main frame; described power module comprises 8 groups of separate power supplys, and each power supply is connected with one or several module in control module, analog input module, analog output module, PTC temperature collect module, switching input module, switching value output module, failure wave-recording module, communication module, display module and keyboard input module respectively.
9. Micro-Processor Protection Device for Low Voltage Motors as claimed in claim 7, is characterized in that: described control module is micro controller module, and described micro controller module comprises multi-functional microcontroller chip and difference connected reset circuit, hardware clock circuit and E
2rOM circuit.
10. Micro-Processor Protection Device for Low Voltage Motors as claimed in claim 7, is characterized in that:
Described analog input module comprises passive filter circuit and the active filter circuit that the weak voltage signal for Special mutual-inductor transmission is come carries out filtering before being sent to control module;
Described analog output module comprise signal conversion and the circuit that keeps so that 4～20mA continuous current signal stabilization of institute's bringing onto load output while being no more than 500 ohm and linear adjustable;
Described PTC temperature collect module comprises that signal conversion and holding circuit are to transfer to control module by the signal after conversion;
Described switching input module comprises for outside switching value signal being converted to current-limiting circuit and the photoelectric coupling circuit of digital quantity level signal;
Described switching value output module comprises enable circuits, photoelectric coupling circuit, relay drive circuit;
Described communication module comprises communication level conversion correction circuit;
Described display module comprises Liquid Crystal Module, display control chip and reset circuit;
Described keyboard input module comprises key circuit and de-twitter circuit;
Described communication module is also provided with the expansion interface for communicating by letter with external equipment by other communication modes outside serial communication, can to Micro-Processor Protection Device for Low Voltage Motors, be realized by electric power monitoring system that distant place switching, a distant place are revised definite value, distant place alarm signal resets when Micro-Processor Protection Device for Low Voltage Motors is connected with electric power monitoring system by realizing the interface of serial communication or expansion interface.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106207958A (en) * | 2016-07-04 | 2016-12-07 | 常俊苹 | The overcurrent protection that a kind of microcomputer low-voltage starts |
| CN107065720A (en) * | 2017-04-20 | 2017-08-18 | 哈尔滨理工大学 | Intelligent electric machine failure wave-recording early warning system |
-
2013
- 2013-09-09 CN CN201320557911.5U patent/CN203423479U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106207958A (en) * | 2016-07-04 | 2016-12-07 | 常俊苹 | The overcurrent protection that a kind of microcomputer low-voltage starts |
| CN107065720A (en) * | 2017-04-20 | 2017-08-18 | 哈尔滨理工大学 | Intelligent electric machine failure wave-recording early warning system |
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