CN1527455A - Protecting circuit - Google Patents
Protecting circuit Download PDFInfo
- Publication number
- CN1527455A CN1527455A CNA031192718A CN03119271A CN1527455A CN 1527455 A CN1527455 A CN 1527455A CN A031192718 A CNA031192718 A CN A031192718A CN 03119271 A CN03119271 A CN 03119271A CN 1527455 A CN1527455 A CN 1527455A
- Authority
- CN
- China
- Prior art keywords
- discharge tube
- circuit
- switch
- protection circuit
- alarm
- 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.)
- Pending
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Abstract
The new protecting circuit makes it possible to prevent burning of distributing frame and outer cable when being connected to electric supply now matter how long the outer cable is and no matter what the resistance is and to send warning signal. The protecting circuit includes discharging tube connected between the main circuit of the protection unit of distributing frame and the ground of distributing frame, overcurrent protecting element connected serially in the main circuit, circuit opening switch connected serially in the main circuit and warning switch connected serially with the warning indication circuit. The discharging tube has break-down voltage within the electric supply voltage 220 V and will be broken down by the end voltage over its break-down voltage, and the heat during discharging will actuate the warning switch and the circuit opening switch for the warning circuit to send warning indication and the main to be cut off before the discharging tube stops discharging.
Description
Technical field
The present invention relates to the communication line field, wherein relate in particular to a kind of protection circuit of communication line.
Background technology
At first introduce two relevant nouns of the present invention:
Fail safe fail-safe (FS).
Discharge tube abating protection device, its effect are that the discharge tube heating makes its action, makes communication line directly into ground the discharge tube short circuit when discharge tube long-time (non-moment) discharge.
In the communications field; the Security Unit of main frame product plays protective action in communication line; when civil power is overlapped in the communication line; existing traditional Security Unit protection circuit is overflow protecting element open circuit or high resistant; over-voltage protection element conducting over the ground discharges and makes the FS short circuit within a short period of time; with the short circuit of discharge tube the two poles of the earth, send alarm simultaneously.
Be depicted as the protection schematic diagram of prior art as Fig. 1 a and Fig. 1 b, wherein: R
1And R
2Be line resistance, determine its resistance by line length and line footpath and material.
R
3And R
4Be the distributing frame overflow protecting element, can be fuse, heat coil, the combination of fuse heater coil, semistor PTCR (ceramic material cPTCR or high-molecular organic material pPTCR).
FS
1And FS
2Be the discharge tube abating protection device.
K
1And K
2For with FS
1, FS
2The discharge tube fail safe alarm switch of interlock.
A, b are the outer line end of Security Unit;
A ', b ' are line end in the Security Unit;
S is the security unit alarming signal end;
GDT1, GDT2 are gas discharge tube (220V
ACThe time can puncture);
SA1, SA2 are semiconductor discharge tube (220V
ACThe time can puncture);
When the 220V civil power is overlapped on A (B) when locating, overflow protecting element R
3(R
4) at first open a way or be high resistant, making a (b) point and A (B) some equipotential, discharge tube is breakdown, in the process of releasing over the ground, FS
1(FS
2) be the discharge tube abating protection device, this closed back of device discharge tube is by short circuit, and the harm electric current will continue through FS
1(FS
2) release over the ground, at this moment, distributing frame and external cable all have electric current to pass through, simultaneously and FS
1, FS
2The K of interlock
1(K
2) be discharge tube fail safe alarm switch, the alarm switch closure is sent alarm.
The shortcoming of prior art is: existing protection circuit is grown and line resistance (R at external cable
1And R
2) be feasible when big, but as the short and line resistance (R of external cable
1And R
2) hour, the electric current of flow through external cable and Security Unit will very big, may will burn at short notice external cable with (or) distributing frame Security Unit and line bank module, even can cause fire.
Summary of the invention
Because the shortcoming of prior art the present invention proposes a kind of new protection circuit, purpose is by using new protection circuit, external cable length no matter, the line resistance height does not have the hidden danger of burning distributing frame and external cable when civil power overlaps, can also send alarm signal.
For this reason, the present invention adopts following scheme:
A kind of protection circuit; comprise the discharge tube that is parallel between this distributing frame Security Unit main line and the distributing frame ground wire; be serially connected in the overflow protecting element in the main line; the alarm switch that is connected in series with alarm indication circuit; it is breakdown when the discharge tube both end voltage is higher than its puncture voltage; it is characterized in that also comprising the open switch that is serially connected in the main road line; described open switch and alarm switch interlock; discharge tube punctures back continuous discharge adstante febre makes described alarm switch and open switch interlock; closed alarm switch; disconnect main line again, discharge tube stops discharge.
Described discharge tube can be gas discharge tube or semiconductor discharge tube.
The puncture voltage of described discharge tube is set in the line voltage scope.
Described overflow protecting element can be fuse, heat coil, the combination of fuse heater coil or semistor PTCR.
Described semistor PTCR can be ceramic material cPTCR or high-molecular organic material pPTCR.
Described alarm and open circuit linked switch are the hot melten type switch, produce heat during the discharge tube continuous discharge and make its alarm switch closure, and open switch disconnects.
Advantage of the present invention is can not burn distributing frame equipment or external cable when civil power overlaps, and lightning Protection is unaffected.
Description of drawings
Fig. 1 a is a gas discharge tube protection circuit schematic diagram of the prior art;
Fig. 1 b is a semiconductor discharge tube protection circuit schematic diagram of the prior art;
Fig. 2 a is the gas discharge tube protection circuit schematic diagram of technical solution of the present invention;
Fig. 2 b is the semiconductor discharge tube protection circuit schematic diagram of technical solution of the present invention.
Embodiment
Because the various shortcomings of prior art the present invention proposes a kind of protection circuit that can overcome above-mentioned shortcoming.The present invention is by using new protection circuit, external cable length no matter, and the line resistance height does not have the hidden danger of burning distributing frame and external cable when civil power overlaps, can also send alarm signal.
Provide the specific embodiment of the present invention below.Shown in Fig. 2 a, 2b, be respectively gas discharge tube protection circuit schematic diagram of the present invention and semiconductor discharge tube protection circuit schematic diagram.
Wherein:
R
1And R
2Be line resistance, determine its resistance by line length and line footpath and material;
R
3And R
4Be the distributing frame overflow protecting element, can be fuse, heat coil, the combination of fuse heater coil, semistor PTCR (ceramic material cPTCR or high-molecular organic material pPTCR);
K
1And K
2Be open switch;
K
3, K
4For and K
1, K
2The alarm switch of interlock;
A, b are the outer line end of Security Unit;
A ', b ' are line end in the Security Unit;
S is the security unit alarming signal end;
GDT1, GDT2 are gas discharge tube (220V
ACThe time can puncture);
SA1, SA2 are semiconductor discharge tube (220V
ACThe time can puncture).
Shown in Fig. 2 a, open switch K
1And K
2, be arranged on circuit and go into end, i.e. outer line end a, b of Security Unit, and respectively with alarm switch K
3And K
4Interlock, synchronization action.Cause when continuing overcurrent harm at civil power overlap joint, open circuit in the short time, reaching when the sustained overvoltage overcurrent endanger, open-circuit line and discharge loop, and produce the purpose that continues alarm signal, while distributing frame equipment R
3, R
4Destroyed and avoid disaster hidden-trouble with the external cable circuit is unlikely by the sustained overvoltage overcurrent.
It should be noted that: the overcurrent-overvoltage protection circuit on the whole treats, after the input of 220V voltage, and R
3, R
4At first action is high resistant, R like this
1, R
2Resistance is just very little comparatively speaking, and E, G point voltage just are similar to 220V, and then discharge tube is just with breakdown.
Compare with Fig. 1 a, this embodiment has been cancelled the grounding shunt circuit of discharge tube, has promptly cancelled discharge tube abating protection device FS
1, FS
2
K when the circuit normal condition
1(K
2) closure, K
3(K
4) disconnect; When the 220V civil power is overlapped on A, B place, R
3, R
4Action is high resistant, and this moment, the lifting of E, G point current potential reached the breakdown scope of gas discharge tube GDT1, GDT2, discharge tube in the process that continues over the ground to release, K at first
3(or K
4) the alarm switch closure, send alarm.While K
1Or K
2Switch motion is become by closure makes the outer line end main line open circuit of Security Unit will endanger failure of current, at this moment, distributing frame and external cable all no current pass through, alarm signal continues existence.(note: K
1(K
2) K
3(K
4) be linked switch, but want closed alarm switch earlier, open switch disconnects again, if disconnect open switch conversely earlier, discharge tube no current and stop heating, easy the to be molten metal of thermal switch will stop to flow, alarm switch can not closure).In like manner, another embodiment shown in Fig. 2 b, open switch K
1, K
2, be arranged on circuit and go into end, i.e. outer line end a, b of Security Unit, and respectively with alarm switch K
3And K
4Interlock, synchronization action.When civil power overlap joint caused lasting overcurrent, overvoltage injury, open circuit main line in the short time reaching open-circuit line and discharge loop, and produced the purpose that continues alarm signal, simultaneously distributing frame equipment R
3, R
4Destroyed and avoid disaster hidden-trouble with the external cable circuit is unlikely by the sustained overvoltage overcurrent.
Compare with Fig. 1 b, this embodiment has been cancelled the grounding shunt circuit of discharge tube, has promptly cancelled discharge tube abating protection device FS
1, FS
2
K when the circuit normal condition
1(K
2) closure, K
3(K
4) disconnect; When the 220V civil power was overlapped on A, B place, semiconductor discharge tube SA1, SA2 were breakdown, in the process of releasing over the ground, and K in the short time
1Or K
2Switch motion is become by closure makes the outer line end main line open circuit of Security Unit; , will endanger failure of current, at this moment, distributing frame and external cable all no current pass through Lian Dong K simultaneously
3(or K
4) the alarm switch closure, send alarm.
By above two specific embodiments, can draw the beneficial effect that technical solution of the present invention brings has following 2 points:
Beneficial effect 1: can not burn distributing frame equipment or external cable during the civil power overlap joint;
Beneficial effect 2: lightning Protection is unaffected.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claims.
Claims (6)
1, a kind of protection circuit; comprise the discharge tube that is parallel between this distributing frame Security Unit main line and the distributing frame ground wire; be serially connected in the overflow protecting element in the main line; the alarm switch that is connected in series with alarm indication circuit; it is breakdown when the discharge tube both end voltage is higher than its puncture voltage; it is characterized in that also comprising the open switch that is serially connected in the main road line; described open switch and alarm switch interlock; discharge tube punctures back continuous discharge adstante febre makes described alarm switch and open switch interlock; the closed alarm switch of elder generation; disconnect main line again, discharge tube stops discharge.
2, protection circuit as claimed in claim 1 is characterized in that described discharge tube can be gas discharge tube or semiconductor discharge tube.
3, protection circuit as claimed in claim 2 is characterized in that the puncture voltage of described discharge tube is set in the line voltage scope.
4, protection circuit as claimed in claim 1 is characterized in that described overflow protecting element can be fuse, heat coil, the combination of fuse heater coil or semistor PTCR.
5, protection circuit as claimed in claim 4 is characterized in that described semistor PTCR can be ceramic material cPTCR or high-molecular organic material pPTCR.
6, protection circuit as claimed in claim 1 is characterized in that described alarm and open circuit linked switch are the hot melten type switch, produces heat during the discharge tube continuous discharge and makes its alarm switch closure, and open switch disconnects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031192718A CN1527455A (en) | 2003-03-06 | 2003-03-06 | Protecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031192718A CN1527455A (en) | 2003-03-06 | 2003-03-06 | Protecting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1527455A true CN1527455A (en) | 2004-09-08 |
Family
ID=34285043
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA031192718A Pending CN1527455A (en) | 2003-03-06 | 2003-03-06 | Protecting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1527455A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1950982B (en) * | 2004-02-27 | 2010-05-05 | 哥维斯股份公司 | Automatic reset device particularly for residual current-operated circuit breakers and the like |
| CN105279314A (en) * | 2015-09-28 | 2016-01-27 | 西安交通大学 | Electric aging test simulation computing method for multiple parallel direct-current cables |
| WO2019114377A1 (en) * | 2017-12-15 | 2019-06-20 | 南京中兴软件有限责任公司 | Security unit |
-
2003
- 2003-03-06 CN CNA031192718A patent/CN1527455A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1950982B (en) * | 2004-02-27 | 2010-05-05 | 哥维斯股份公司 | Automatic reset device particularly for residual current-operated circuit breakers and the like |
| CN105279314A (en) * | 2015-09-28 | 2016-01-27 | 西安交通大学 | Electric aging test simulation computing method for multiple parallel direct-current cables |
| WO2019114377A1 (en) * | 2017-12-15 | 2019-06-20 | 南京中兴软件有限责任公司 | Security unit |
| EP3726682A4 (en) * | 2017-12-15 | 2021-08-25 | Nanjing Zhongxing Software Company Limited. | Security unit |
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |