CN202997504U - Electronic overload relay with open-phase protection function - Google Patents
Electronic overload relay with open-phase protection function Download PDFInfo
- Publication number
- CN202997504U CN202997504U CN 201220699784 CN201220699784U CN202997504U CN 202997504 U CN202997504 U CN 202997504U CN 201220699784 CN201220699784 CN 201220699784 CN 201220699784 U CN201220699784 U CN 201220699784U CN 202997504 U CN202997504 U CN 202997504U
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- resistance
- resistor
- operational amplifier
- integrated operational
- overload relay
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Abstract
The utility model relates to an electronic overload relay with open-phase protection function. The electronic overload relay comprises a relay actuating mechanism and a drive coil, primary sides of three transformers are respectively connected with an A, B and C three-phase main circuit, each of secondary sides of the three transformers is connected with the anodes of two diodes; the cathodes of six diodes are connected with one end of a second resistor, and the other end of the second resistor and one end of a first resistor are connected with a positive input end of an integrated operational amplifier; the other end of the first resistor and one end of a third resistor are connected with a system ground potential (GND); the other end of the third resistor and one end of a fourth resistor are connected with a negative input end of the integrated operational amplifier; and the other end of the fourth resistor is connected with a system power supply Vcc, an output end of the integrated operational amplifier is connected with a microprocessor, an output end of the microprocessor is connected with the drive coil, and the drive coil is connected with the actuating mechanism. Only six diodes are connected together to carry out signal superposition, the integrated operational amplifier detects whether an open-phase circuit exists or not, and the microcomputer makes judgment and achieves the function of open-phase protection. Therefore, the electronic overload relay is simple in structure, accurate in judgment and reliable in action.
Description
Technical field
The utility model electronic relay particularly relates to a kind of electronic overload relay with phase failure protection function.
Background technology
Present modern low-voltage distribution system is captured by intelligent electrical apparatus fully, and traditional thermal relay is also substituted gradually by electronic overload relay.Phase failure protection function has become necessary functions in electronic relay.
Summary of the invention
The utility model provides a kind of electronic overload relay with phase failure protection function that replaces traditional thermal relay for solving the technical problem that exists in known technology.
The technical scheme that the utility model is taked for the technical problem that exists in the solution known technology is: it includes described electronic overload relay actuator (U4) and drive coil (U3), also include first, second and third instrument transformer (CT1, CT2, CT3), described first, second and third instrument transformer (CT1, CT2, CT3) primary side connects respectively A, B, C three-phase major loop, and the secondary side output of described the first instrument transformer (CT1) connects respectively first and second diode (D1, D2) anode; The secondary side output of described the second instrument transformer (CT2) connects respectively third and fourth diode (D3, D4) anode; The secondary side output of the 3rd instrument transformer (CT3) connects respectively the 5th, six diodes (D5, D6) anode; Described first, second, third and fourth, five, six diode (D1, D2, D3, D4, D5, D6) negative electrode connect together an end of the second resistance (R2), the positive input of a termination integrated operational amplifier (U1) of the other end of described the second resistance (R2) and the first resistance (R1); One end of the other end of described the first resistance (R1) and described the 3rd resistance (R3) is welding system earth potential (GND) simultaneously; One end of the other end of described the 3rd resistance (R3) and described the 4th resistance (R4) connects the negative input of described integrated operational amplifier (U1) simultaneously; The other end welding system power Vcc of described the 4th resistance (R4), the output termination microprocessor (U2) of described integrated operational amplifier U1, the described drive coil of output termination (U3) of described microprocessor (U2), described drive coil (U3) meets described overload relay actuator (U4).
Advantage and the good effect that the utlity model has are: only connect by 6 diodes and carry out signal stack, an integrated operational amplifier detects the existence of disconnected circuitry phase, with microprocessor judges and realize phase failure protection function.This simple in structure, accuracy of judgement, reliable in action.
Description of drawings
Fig. 1 is electrical schematic diagram 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, A, B, C three-phase major loop connect respectively the primary side of instrument transformer CT1, CT2, CT3, and the secondary side output of instrument transformer CT1 connects respectively diode D1, D2 anode; The secondary side output of instrument transformer CT2 connects respectively diode D3, D4 anode; The secondary side output of instrument transformer CT3 connects respectively diode D5, D6 anode; Diode D1, D2, D3, D4, D5, the negative electrode of D6 be the end of connecting resistance R2 together, the positive input of the other end of resistance R 2 and resistance R 1 one termination integrated operational amplifier U1; One end of the other end of resistance R 1 and resistance R 3 is the welding system ground potential GND simultaneously; The other end of resistance R 3 and resistance R 4 one ends connect the negative input of integrated operational amplifier U1 simultaneously; The other end welding system power Vcc of resistance R 4.The output termination microprocessor U2 of integrated operational amplifier U1, the output termination drive coil U3 of microprocessor U2; Drive coil U3 takes over the U4 of actuator that carries relay.
Its operation principle is: instrument transformer CT1, CT2, CT3 induce AC signal from major loop A, B, C three-phase circuit, three-phase ac signal is received together by 6 diodes and is superposeed, if three-phase circuit has in the situation of electricity, the three-phase ac signal stack, a fixed potential superposes out, by resistance R 1 and R2 dividing potential drop, a fixed potential is provided for integrated operational amplifier U1 positive input.By resistance R 3 coupling with the R4 resistance, make current potential between it less than the current potential between R1 and R2, so the current potential of integrated operational amplifier U1 positive input greater than the current potential of negative input, the output of integrated operational amplifier U1 is high level.
When if a circuitry phase outage is arranged in circuit, only have the two-phase AC signal to superpose, the current potential that superposes out will be lower than the current potential of three-phase signal stack, thus the positive input current potential of integrated operational amplifier U1 less than the current potential of negative-phase input, integrated operational amplifier U1 output is low level.
The I/O mouth of the output termination microprocessor U2 of integrated operational amplifier U1; the high and low level of microprocessor U2 by the I/O mouth changes to judge whether disconnected phase of main circuit; if the circuitry phase phase of breaking is arranged; microprocessor U2 will drive coil U3; the U4 of the actuator action of coil drive overload relay, thus realize phase failure protection function.
Claims (1)
1. electronic overload relay with phase failure protection function, it includes described electronic overload relay actuator (U4) and drive coil (U3), it is characterized in that: also include first, second and third instrument transformer (CT1, CT2, CT3), described first, second and third instrument transformer (CT1, CT2, CT3) primary side connects respectively A, B, C three-phase major loop, and the secondary side output of described the first instrument transformer (CT1) connects respectively first and second diode (D1, D2) anode; The secondary side output of described the second instrument transformer (CT2) connects respectively third and fourth diode (D3, D4) anode; The secondary side output of the 3rd instrument transformer (CT3) connects respectively the 5th, six diodes (D5, D6) anode; Described first, second, third and fourth, five, six diode (D1, D2, D3, D4, D5, D6) negative electrode connect together an end of the second resistance (R2), the positive input of a termination integrated operational amplifier (U1) of the other end of described the second resistance (R2) and the first resistance (R1); One end of the other end of described the first resistance (R1) and described the 3rd resistance (R3) is welding system earth potential (GND) simultaneously; One end of the other end of described the 3rd resistance (R3) and described the 4th resistance (R4) connects the negative input of described integrated operational amplifier (U1) simultaneously; The other end welding system power Vcc of described the 4th resistance (R4), the output termination microprocessor (U2) of described integrated operational amplifier U1, the described drive coil of output termination (U3) of described microprocessor (U2), described drive coil (U3) meets described overload relay actuator (U4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220699784 CN202997504U (en) | 2012-12-18 | 2012-12-18 | Electronic overload relay with open-phase protection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220699784 CN202997504U (en) | 2012-12-18 | 2012-12-18 | Electronic overload relay with open-phase protection function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202997504U true CN202997504U (en) | 2013-06-12 |
Family
ID=48568636
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220699784 Expired - Lifetime CN202997504U (en) | 2012-12-18 | 2012-12-18 | Electronic overload relay with open-phase protection function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202997504U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105337416A (en) * | 2015-11-19 | 2016-02-17 | 南京大全电气研究院有限公司 | Remote control circuit and remote control method of electronic type relay |
-
2012
- 2012-12-18 CN CN 201220699784 patent/CN202997504U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105337416A (en) * | 2015-11-19 | 2016-02-17 | 南京大全电气研究院有限公司 | Remote control circuit and remote control method of electronic type relay |
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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 | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130612 |