CN203278187U - Broken wire protection device - Google Patents
Broken wire protection device Download PDFInfo
- Publication number
- CN203278187U CN203278187U CN 201320214554 CN201320214554U CN203278187U CN 203278187 U CN203278187 U CN 203278187U CN 201320214554 CN201320214554 CN 201320214554 CN 201320214554 U CN201320214554 U CN 201320214554U CN 203278187 U CN203278187 U CN 203278187U
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- protection device
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- broken wire
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Abstract
The utility model provides a broken wire protection device which is safe and reliable. The device comprises a stabilized voltage power supply low-frequency signal generator, an amplification circuit, a comparison and detection circuit, a protection output circuit and a fault display circuit, and the operating condition of the amplification circuit is controlled by an external LC resonance circuit. The broken wire protection device in the utility model is used for electric mobile trackless equipment and engineering machinery in an IT three-phase power grid whose neutral point is not grounded, so as to carry out on-line detection the continuity of a PE wire, thereby ensuring the effectiveness of equipotential protection and the basic conditions for action of an electric leakage protection device, and protecting driver and passengers from injuries caused by electric shock. The action principle is novel, and the device is safe and reliable.
Description
Technical field
The utility model relates to a kind of broken wire protecting equipment, especially a kind of broken string PE protective device.
Background technology
The three-phase low-voltage electric power system of catastrophe risk environment and special purpose (380V～1140V), must adopt the electrical network of IT ground protection pattern according to GB.Integrity and the continuity of this electric network protection earth connection are most important.Especially railless electric mining machinery and engineering machinery, protective earthing line are not only the measure of equipotential protection personal safety, and are the preconditions of earth leakage protective action.Because ground wire is passive, so detect its integrity and continuity is both important and very difficult, belong to technological gap, existing all kinds breaking protection (as disconnected N line protection) is applicable to active circuit, and is invalid to the detection of passive circuit.
The utility model content
The utility model provides a kind of safe and reliable broken wire protecting equipment.
Realize a kind of broken wire protecting equipment of the utility model purpose, comprise the low frequency generator, amplifying circuit, comparison testing circuit, protection output circuit and the fault display circuit that are connected successively with stabilized voltage power supply.
The operating mode of outside three-phase trapper is depended in the load of described amplifying circuit.
The beneficial effects of the utility model are as follows:
The utility model is used for electronic mobile trackless equipment and the engineering machinery of isolated neutral IT three phase network, can detect online the continuity of PE line, thereby guarantee the actual effect of equipotential protection and the primary condition of earth leakage protective device action, the protection driver and conductor avoids electric shock, operating principle is novel; Safe and reliable.
Description of drawings
Fig. 1 is the schematic diagram of a kind of broken wire protecting equipment of the present utility model.
Embodiment
As shown in Figure 1, a kind of broken wire protecting equipment of the present utility model comprises the low frequency generator, amplifying circuit, comparison testing circuit, protection output circuit and the fault display circuit that are connected successively with stabilized voltage power supply.
The operation principle of a kind of broken wire protecting equipment of the present utility model is as follows:
1, low frequency generator: generator produces stable 4KHz low frequency signal.
2, amplifying circuit: according to the resonance condition of protected circuit, the 4KHZ amplitude that is exaggerated and different.
3, testing circuit relatively: when protected circuit is interval when the fault of broken string occurring, the LC device that is protected section is destroyed the series resonance condition that the 4KHz low frequency signal forms, the crest current potential of amplifier emitter output square wave reduces, and can not make comparator output signal; When the intact situation of protected circuit; the LC device that is protected section forms series resonance to the 4kHz low frequency signal; output impedance is minimum; output current is maximum; thereby the change that has influence on input current is large; the crest potential rise of amplifier emitter output square wave makes comparator output square-wave signal.
4, protection output circuit: when relatively testing circuit was exported square-wave signal, transformer had Voltage-output, makes the coil of relay get electric; When comparator output direct current signal, the transformer output voltage is OV, and the coil of relay is not charged.Relay normally open contact is concatenated in the no-voltage trip wire loop of circuit breaker.During normal operation, the coil of relay is charged, and normally opened contact is closed, and the no-voltage trip coil of circuit breaker is charged.Under failure condition, the coil losing electricity of relay, normally opened contact disconnects, thereby makes the no-voltage trip coil blackout of circuit breaker, circuit breaker trip.
5, fault display circuit: broken wire protecting equipment is equipped with three signal lamps, two red Huangs.Upper signal red light is the memory signal lamp.As long as disconnection fault occured, not front by " reset button ", this signal lamp lights always, has memory function.The next signal red light is the disconnection fault signal designation, and after disconnection fault was eliminated, this lamp extinguished.The amber light of interposition is the normal operation indicator light.Amber light extinguishes when disconnection fault or this main frame internal fault occur.
6, stabilized voltage power supply: input 220V AC power, by transformer and serial regulating circuit, for device provides reliable and stable 12V direct voltage.
Embodiment recited above is described preferred implementation of the present utility model; be not that scope of the present utility model is limited; do not breaking away under the spiritual prerequisite of the utility model design; various distortion and improvement that the common engineers and technicians in this area make technical solutions of the utility model all should fall in the definite protection range of claims of the present utility model.
Claims (1)
1. a broken wire protecting equipment, is characterized in that: comprise the low frequency generator, amplifying circuit, comparison testing circuit, protection output circuit and the fault display circuit that are connected successively with stabilized voltage power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320214554 CN203278187U (en) | 2013-04-25 | 2013-04-25 | Broken wire protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320214554 CN203278187U (en) | 2013-04-25 | 2013-04-25 | Broken wire protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203278187U true CN203278187U (en) | 2013-11-06 |
Family
ID=49508515
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320214554 Expired - Fee Related CN203278187U (en) | 2013-04-25 | 2013-04-25 | Broken wire protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203278187U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104242008A (en) * | 2014-09-26 | 2014-12-24 | 中讯邮电咨询设计院有限公司 | Half-floating-ground lightning protection grounding method for small LTE (long term evolution) distributed base station |
| WO2018171240A1 (en) * | 2017-03-22 | 2018-09-27 | 南京南瑞继保电气有限公司 | Method and system for protection against disconnection of power transmission and distribution lines |
-
2013
- 2013-04-25 CN CN 201320214554 patent/CN203278187U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104242008A (en) * | 2014-09-26 | 2014-12-24 | 中讯邮电咨询设计院有限公司 | Half-floating-ground lightning protection grounding method for small LTE (long term evolution) distributed base station |
| CN104242008B (en) * | 2014-09-26 | 2016-05-18 | 中讯邮电咨询设计院有限公司 | Small-sized LTE distributed base station half floating ground lightning protection method |
| WO2018171240A1 (en) * | 2017-03-22 | 2018-09-27 | 南京南瑞继保电气有限公司 | Method and system for protection against disconnection of power transmission and distribution lines |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131106 Termination date: 20170425 |