CN202997500U - Electronic overload relay - Google Patents
Electronic overload relay Download PDFInfo
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- CN202997500U CN202997500U CN 201220707335 CN201220707335U CN202997500U CN 202997500 U CN202997500 U CN 202997500U CN 201220707335 CN201220707335 CN 201220707335 CN 201220707335 U CN201220707335 U CN 201220707335U CN 202997500 U CN202997500 U CN 202997500U
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Abstract
The utility model relates to an electronic overload relay. Three mutual inductors detect A, B, C three phase current signals in a main circuit; three phase AC signals are converted into DC signals through three rectifier bridges; three phase rectification signals are stabilized into voltage signals through a voltage-regulator diode and are inputted into a DC power module; the DC power module provides a working power for a microprocessor. On the other hand, the three phase current signals are respectively in connection with three resistors and are changed into small voltage signals; three integrated operational amplifiers detect and amplify the voltage signals; a signal processing module processes the signals into signals distinguishable by the microprocessor; the microprocessor performs determination and outputs signals to a coil driving execution mechanism if exceeding a process preset value. The electronic overload relay realizes line overload protection through a simple electronic member, has a simple structure, saves materials, possesses accurate motion, overcomes the disadvantage that for a traditional thermal relay, motion is slow and time is not accurate enough and fully raises reliability for controlling motion of an electric appliance.
Description
Technical field
The utility model belongs to a kind of overload relay, particularly relates to a kind of electronic overload relay.
Background technology
Traditional overload relay is out of shape to realize overload protection by the bimetal leaf heated bending at present, so be thermal relay.Along with intelligent electrical apparatus captures low-voltage distribution system, electronic overload relay also substitutes traditional thermal relay gradually.
Summary of the invention
The utility model provides a kind of a kind of electronic overload relay that is comprised of electronic component for solving the technical problem that exists in known technology.
The utility model for the technical scheme that solves the technical problem that exists in known technology and take is: the secondary side of first, second and third three-phase instrument transformer (CT1, CT2, CT3) of side joint major loop A, a B, C three-phase bus connects respectively first, second and third rectifier bridge (Q1, Q2, Q3) input, the forward output of described first, second and third rectifier bridge (Q1, Q2, Q3) connects voltage stabilizing didoe (D7) negative electrode together, connect again the input of power module (U1), the power input of the output termination microprocessor (U2) of described power module (U1); The end that described voltage stabilizing didoe (D7) anode connects the first resistance (R1) connects the ground input of described power module (U1) and microprocessor (U2) simultaneously; The negative sense output of described first, second and third rectifier bridge (Q1, Q2, Q3) connects respectively an end of first, second and third resistance (R1, R2, R3) and the 7th, eight, nine resistance (R7, R8, R9); The other end of described first, second and third resistance (R1, R2, R3) connects respectively the end of fourth, fifth, six resistance (R4, R5, R6), and the other end of described fourth, fifth, six resistance (R4, R5, R6) connects respectively the positive input of first, second and third integrated operational amplifier (T1, T2, T3); Another termination the tenth, 11 of described the 7th, eight, nine resistance (R7, R8, R9), 12 resistance (R10, R11, a R12) end also access respectively the negative input of described first, second and third integrated operational amplifier (T1, T2, T3); The other end of described the tenth, 11,12 resistance (R10, R11, R12) connects respectively the output of described first, second and third integrated operational amplifier (T1, T2, T3); The output of described first, second and third integrated operational amplifier (T1, T2, T3) connects signal processing module (U3) input together, the I/O mouth of the described microprocessor of output termination (U2) of described signal processing module (U3); The output of described microprocessor (U2) is the output that connects drive coil.
Advantage and the good effect that the utlity model has are: realize overload protection in circuit by simple soft copy.This project organization is simple, saves material, and action has precisely overcome traditional thermal relay slow motion, the shortcoming that the time is not accurate enough.Fully improved the reliability of control apparatus action.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
For further understanding summary of the invention of the present utility model, Characteristic, hereby exemplify following examples, and coordinate accompanying drawing to be described in detail as follows:
As shown in Figure 1, major loop A, B, C three-phase bus connect the primary side of CT1, CT2, CT3 three-phase instrument transformer, the secondary side of instrument transformer CT1, CT2, CT3 connects respectively rectifier bridge Q1, Q2, Q3 input, the forward output of rectifier bridge Q1, Q2, Q3 connects voltage stabilizing didoe D7 negative electrode together, connect again the input of power module U1, the power input of the output termination microprocessor U2 of power module U1; The end of voltage stabilizing didoe D7 anode connecting resistance R1 connects the ground input of power module U1 and microprocessor U2 simultaneously.The negative sense output of rectifier bridge Q1, Q2, Q3 is the end of connecting resistance R1, R2, R3 and resistance R 7, R8, R9 respectively; The other end of resistance R 1, R2, R3 is the end of connecting resistance R4, R5, R6 respectively, and the other end of resistance R 4, R5, R6 connects respectively the positive input of integrated operational amplifier T1, T2, T3; Other end connecting resistance R10, the R11 of resistance R 7, R8, R9, R12 one end also access respectively the negative input of integrated operational amplifier T1, T2, T3; The other end of resistance R 10, R11, R12 connects respectively the output of integrated operational amplifier T1, T2, T3; The output of integrated operational amplifier T1, T2, T3 connects signal processing module U3 input together, the I/O mouth of the output termination microprocessor U2 of signal processing module U3.Microprocessor U2 meets drive coil U4, and drive coil U4 takes over the U5 of actuator that carries relay.
Claims (1)
1. electronic overload relay, it is characterized in that: the secondary side of first, second and third three-phase instrument transformer (CT1, CT2, CT3) of side joint major loop A, a B, C three-phase bus connects respectively first, second and third rectifier bridge (Q1, Q2, Q3) input, the forward output of described first, second and third rectifier bridge (Q1, Q2, Q3) connects voltage stabilizing didoe (D7) negative electrode together, connect again the input of power module (U1), the power input of the output termination microprocessor (U2) of described power module (U1); The end that described voltage stabilizing didoe (D7) anode connects the first resistance (R1) connects the ground input of described power module (U1) and microprocessor (U2) simultaneously; The negative sense output of described first, second and third rectifier bridge (Q1, Q2, Q3) connects respectively an end of first, second and third resistance (R1, R2, R3) and the 7th, eight, nine resistance (R7, R8, R9); The other end of described first, second and third resistance (R1, R2, R3) connects respectively the end of fourth, fifth, six resistance (R4, R5, R6), and the other end of described fourth, fifth, six resistance (R4, R5, R6) connects respectively the positive input of first, second and third integrated operational amplifier (T1, T2, T3); Another termination the tenth, 11 of described the 7th, eight, nine resistance (R7, R8, R9), 12 resistance (R10, R11, a R12) end also access respectively the negative input of described first, second and third integrated operational amplifier (T1, T2, T3); The other end of described the tenth, 11,12 resistance (R10, R11, R12) connects respectively the output of described first, second and third integrated operational amplifier (T1, T2, T3); The output of described first, second and third integrated operational amplifier (T1, T2, T3) connects signal processing module (U3) input together, the I/O mouth of the described microprocessor of output termination (U2) of described signal processing module (U3); The output of described microprocessor (U2) is the output that connects drive coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220707335 CN202997500U (en) | 2012-12-18 | 2012-12-18 | Electronic overload relay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220707335 CN202997500U (en) | 2012-12-18 | 2012-12-18 | Electronic overload relay |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202997500U true CN202997500U (en) | 2013-06-12 |
Family
ID=48568632
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220707335 Expired - Lifetime CN202997500U (en) | 2012-12-18 | 2012-12-18 | Electronic overload relay |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202997500U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103236679A (en) * | 2013-05-16 | 2013-08-07 | 天津市百利电气有限公司 | Electronic type backup protection device for AC (alternating current) circuit breaker |
| CN117976467A (en) * | 2024-03-29 | 2024-05-03 | 苏州锦博元电器有限公司 | Relay capable of overcurrent protection and protection method thereof |
-
2012
- 2012-12-18 CN CN 201220707335 patent/CN202997500U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103236679A (en) * | 2013-05-16 | 2013-08-07 | 天津市百利电气有限公司 | Electronic type backup protection device for AC (alternating current) circuit breaker |
| CN117976467A (en) * | 2024-03-29 | 2024-05-03 | 苏州锦博元电器有限公司 | Relay capable of overcurrent protection and protection method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130612 |
|
| CX01 | Expiry of patent term |