CN202903863U - Four-wire current detection circuit for reclosing device - Google Patents
Four-wire current detection circuit for reclosing device Download PDFInfo
- Publication number
- CN202903863U CN202903863U CN 201220604392 CN201220604392U CN202903863U CN 202903863 U CN202903863 U CN 202903863U CN 201220604392 CN201220604392 CN 201220604392 CN 201220604392 U CN201220604392 U CN 201220604392U CN 202903863 U CN202903863 U CN 202903863U
- Authority
- CN
- China
- Prior art keywords
- circuit
- resistance
- current
- current detection
- detection circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model discloses a four-wire current detection circuit for a reclosing device. The four-wire current detection circuit for the reclosing device comprises a first current detection circuit, a second current detection circuit, a third current detection circuit and a third current detection circuit which are parallelly connected, wherein the first current detection circuit, the second current detection circuit, the third current detection circuit and the third current detection circuit have the same composition; the first current detection circuit comprises a current sampling circuit, a rectifying circuit and a signal amplifying circuit; the current sampling circuit is connected with the rectifying circuit for collecting current signals via a current transformer and then outputting the signals to the rectifying circuit for rectifying; and the signal amplifying circuit is connected with the rectifying circuit for amplifying the current signals outputted by the rectifying circuit and then outputting the signals to the single chip microcomputer of the reclosing device for processing. Four-wire current in the circuit can be detected, such that the reclosing device can provide long overload delay, short short circuit delay and instantaneous short circuit protection for the current of electric equipment.
Description
Technical field
The utility model relates to a kind of four line current testing circuits, relates in particular to a kind of four line current testing circuits for reclosing device.
Background technology
For adapting to the development of electric power enterprise, relay protection and automatic safety device are necessary stable, operation is reliable.In route protection, the introducing of reclosing function and realization can in time be closed a floodgate the switch secondary behind circuit generation transient fault, strengthen the ability of transmission line of electricity fast recovery of power supply.But; traditional reclosing device only has the protection to voltage overvoltage/undervoltage (comprising phase shortage) and residue electric leakage; defencive function to circuit is more single, can not four line currents of circuit be detected, and can't realize the protections such as overload long delay, short circuit short time-delay, the short circuit of electric current be instantaneous.
The utility model content
For above-mentioned technical matters; the purpose of this utility model is to provide a kind of four line current testing circuits for reclosing device; it can detect four line currents in the circuit, thereby makes reclosing device that overload long delay, short circuit short time-delay and the short circuit instantaneous protection of electric current can be provided for consumer.
For reaching this purpose, the utility model by the following technical solutions:
A kind of four line current testing circuits for reclosing device comprise the first current detection circuit, the second current detection circuit, the 3rd current detection circuit and the 4th current detection circuit that are connected in parallel; Wherein, the electric circuit constitute of described first to fourth current detection circuit is identical;
Described the first current detection circuit comprises: current sampling circuit, rectification circuit and signal amplification circuit; Described current sampling circuit is connected with rectification circuit, is used for gathering current signal by current transformer, and exports to rectification circuit and carry out rectification; Described signal amplification circuit is connected with rectification circuit, is used for the current signal of rectification circuit output is amplified, and exports to the single-chip microcomputer processing of reclosing device.
Especially, the bridge rectifier circuit of described rectification circuit for being consisted of by diode D1, diode D2, diode D3 and diode D4.
Especially, described signal amplification circuit comprises resistance R 1, resistance R 2, capacitor C 1, resistance R 3, resistance R 4, operational amplifier U1, capacitor C 2 and capacitor C 3;
Wherein, one end of described resistance R 1 and an end of capacitor C 1, node ground connection after the in the same way input end of operational amplifier U1 connects, the other end of resistance R 1 is connected with an end of resistance R 2, the end of the other end of resistance R 2 and node contact resistance R3 after the other end of capacitor C 1 is connected, the reverse input end of the other end of resistance R 3 and node concatenation operation amplifier U1 after an end of resistance R 4 is connected, the other end of resistance R 4 is connected with the output terminal of operational amplifier U1, the earth terminal ground connection of operational amplifier U1, one end of the power end of operational amplifier U1 and capacitor C 2, node after one end of capacitor C 3 connects connects supply voltage output terminal VCC, the node ground connection that the other end of capacitor C 2 is connected with the other end of capacitor C 3, the output terminal of operational amplifier U1 connects the single-chip microcomputer of closing device.
The utility model realizes that by current sampling circuit, rectification circuit and signal amplification circuit four line currents detect; and the single-chip microcomputer processing of exporting to reclosing device, thereby make reclosing device that overload long delay, short circuit short time-delay and the short circuit instantaneous protection of electric current can be provided for consumer.
Description of drawings
Fig. 1 is the four line current testing circuit structural drawing that are used for reclosing device that the utility model embodiment provides.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, the utility model is described in further detail below in conjunction with drawings and Examples.
Please refer to shown in Figure 1ly, Fig. 1 is the four line current testing circuit structural drawing that are used for reclosing device that the utility model embodiment provides.
The four line current testing circuits that are used for reclosing device in the present embodiment comprise the first current detection circuit, the second current detection circuit, the 3rd current detection circuit and the 4th current detection circuit that is connected in parallel; Wherein, the electric circuit constitute of described first to fourth current detection circuit is identical, and so, first to fourth current detection circuit is also identical to the testing process of four line currents.
Described the first current detection circuit comprises: current sampling circuit, rectification circuit and signal amplification circuit.Described current sampling circuit is connected with rectification circuit, is used for gathering current signal by current transformer, and exports to rectification circuit and carry out rectification.Described signal amplification circuit is connected with rectification circuit, is used for the current signal of rectification circuit output is amplified, and exports to the single-chip microcomputer processing of reclosing device.Identical with the first current detection circuit testing process, the second current detection circuit, the 3rd current detection circuit and the 4th current detection circuit are also exported to the electric current that detects respectively the single-chip microcomputer of described reclosing device and are processed.When described single-chip microcomputer is judged four line currents when normal, single-chip microcomputer will be proceeded to detect to four line currents; When single-chip microcomputer is judged four line currents when unusual, will send instruction to the protection topworks of described reclosing device according to the particular type of fault by single-chip microcomputer, overload long delay, short circuit short time-delay and the short circuit instantaneous protection of electric current is provided for consumer.
The bridge rectifier circuit of rectification circuit described in the present embodiment for being consisted of by diode D1, diode D2, diode D3 and diode D4.Described signal amplification circuit comprises resistance R 1, resistance R 2, capacitor C 1, resistance R 3, resistance R 4, operational amplifier U1, capacitor C 2 and capacitor C 3.Wherein, one end of described resistance R 1 and an end of capacitor C 1, node ground connection after the in the same way input end of operational amplifier U1 connects, the other end of resistance R 1 is connected with an end of resistance R 2, the end of the other end of resistance R 2 and node contact resistance R3 after the other end of capacitor C 1 is connected, the reverse input end of the other end of resistance R 3 and node concatenation operation amplifier U1 after an end of resistance R 4 is connected, the other end of resistance R 4 is connected with the output terminal of operational amplifier U1, the earth terminal ground connection of operational amplifier U1, one end of the power end of operational amplifier U1 and capacitor C 2, node after one end of capacitor C 3 connects connects supply voltage output terminal VCC, the node ground connection that the other end of capacitor C 2 is connected with the other end of capacitor C 3, the output terminal of operational amplifier U1 connects the single-chip microcomputer of closing device.
The technical solution of the utility model realizes that by current sampling circuit, rectification circuit and signal amplification circuit four line currents detect; and the single-chip microcomputer processing of exporting to reclosing device, thereby make reclosing device that overload long delay, short circuit short time-delay and the short circuit instantaneous protection of electric current can be provided for consumer.
Above-mentioned only is preferred embodiment of the present utility model and institute's application technology principle; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; the variation that can expect easily or replacement all should be encompassed in the protection domain of the present utility model.
Claims (3)
1. four line current testing circuits that are used for reclosing device is characterized in that, comprise the first current detection circuit, the second current detection circuit, the 3rd current detection circuit and the 4th current detection circuit that are connected in parallel; Wherein, the electric circuit constitute of described first to fourth current detection circuit is identical;
Described the first current detection circuit comprises: current sampling circuit, rectification circuit and signal amplification circuit; Described current sampling circuit is connected with rectification circuit, is used for gathering current signal by current transformer, and exports to rectification circuit and carry out rectification; Described signal amplification circuit is connected with rectification circuit, is used for the current signal of rectification circuit output is amplified, and exports to the single-chip microcomputer processing of reclosing device.
2. four line current testing circuits for reclosing device according to claim 1 is characterized in that, the bridge rectifier circuit of described rectification circuit for being made of diode D1, diode D2, diode D3 and diode D4.
3. four line current testing circuits for reclosing device according to claim 2 is characterized in that, described signal amplification circuit comprises resistance R 1, resistance R 2, capacitor C 1, resistance R 3, resistance R 4, operational amplifier U1, capacitor C 2 and capacitor C 3;
Wherein, one end of described resistance R 1 and an end of capacitor C 1, node ground connection after the in the same way input end of operational amplifier U1 connects, the other end of resistance R 1 is connected with an end of resistance R 2, the end of the other end of resistance R 2 and node contact resistance R3 after the other end of capacitor C 1 is connected, the reverse input end of the other end of resistance R 3 and node concatenation operation amplifier U1 after an end of resistance R 4 is connected, the other end of resistance R 4 is connected with the output terminal of operational amplifier U1, the earth terminal ground connection of operational amplifier U1, one end of the power end of operational amplifier U1 and capacitor C 2, node after one end of capacitor C 3 connects connects supply voltage output terminal VCC, the node ground connection that the other end of capacitor C 2 is connected with the other end of capacitor C 3, the output terminal of operational amplifier U1 connects the single-chip microcomputer of closing device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220604392 CN202903863U (en) | 2012-11-15 | 2012-11-15 | Four-wire current detection circuit for reclosing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220604392 CN202903863U (en) | 2012-11-15 | 2012-11-15 | Four-wire current detection circuit for reclosing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202903863U true CN202903863U (en) | 2013-04-24 |
Family
ID=48124520
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220604392 Expired - Fee Related CN202903863U (en) | 2012-11-15 | 2012-11-15 | Four-wire current detection circuit for reclosing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202903863U (en) |
-
2012
- 2012-11-15 CN CN 201220604392 patent/CN202903863U/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204065213U (en) | Zero sequence current mutual inductor break detection circuit and residual current detection circuit | |
| CN104198794A (en) | Zero sequence current transformer wire-break detection and residual current detection circuit | |
| CN202770920U (en) | Alternating current vacuum contactor adhesion detection device | |
| CN101614795B (en) | Default-phase signal detection circuit for three-phase power | |
| CN103683186B (en) | A kind of residual current circuit breaker with self-setting function | |
| CN201812008U (en) | Detection circuit for relay protection device | |
| CN201536254U (en) | Protector for power transformer | |
| CN103236679B (en) | Exchange breaker electronic type standby protector | |
| CN203774767U (en) | Cut-off type fault protection circuit of unity power factor boost converter | |
| CN201464592U (en) | Leakage detection device for photovoltaic grid-connected inverter | |
| CN202903863U (en) | Four-wire current detection circuit for reclosing device | |
| CN201378730Y (en) | Power circuit breaker protective circuit | |
| CN103149408B (en) | Microcomputer protection device and current sampling circuit thereof | |
| CN205960779U (en) | P type monitoring formula switching power | |
| CN202978239U (en) | IGBT straight-through overcurrent protection circuit | |
| CN202678082U (en) | Electronic transformer collector with overcurrent and overvoltage prevention function | |
| CN202903862U (en) | Power supply voltage detection circuit for reclosing device | |
| CN202856314U (en) | Residual current circuit breaker having self-setting function | |
| CN203025297U (en) | Return contact-free fuse blow detection circuit | |
| CN103105519A (en) | Four-line current detecting circuit for reclosure device | |
| CN204376376U (en) | Based on the time lagged type residual current action breaker of Quick-type electric leakage integrated package | |
| CN2850758Y (en) | Low-power consumption failure self-examined safe controller for forge and press | |
| CN208636374U (en) | A kind of a-c cycle detection circuit | |
| CN207339234U (en) | A kind of contactor protective device and alternating-current charging pile | |
| CN205583660U (en) | Output current foldback circuit of converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130424 Termination date: 20151115 |
|
| EXPY | Termination of patent right or utility model |