CN103645395A - Isolation and protection circuit for high-voltage live-line monitoring - Google Patents
Isolation and protection circuit for high-voltage live-line monitoring Download PDFInfo
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- CN103645395A CN103645395A CN201310568711.4A CN201310568711A CN103645395A CN 103645395 A CN103645395 A CN 103645395A CN 201310568711 A CN201310568711 A CN 201310568711A CN 103645395 A CN103645395 A CN 103645395A
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Abstract
The invention discloses an isolation and protection circuit for high-voltage live-line monitoring. The isolation and protection circuit comprises a resistor R1 and a resistor R2. The resistor R1 and the resistor R2 are connected in series; the non-common end of the resistor R2 is grounded; the common end of the resistor R1 and the resistor R2 is connected with the input end of an optoelectronic coupler; the output end of the optoelectronic coupler is connected with a non-inverting input end of a comparator through a resistor R6; the output end of the optoelectronic coupler is connected with a surge protection circuit; the output end of the optoelectronic coupler is connected with a power source through a resistor R7; the anti-phase input end of the comparator is connected with a voltage dividing circuit; and the output end of the comparator is connected with a resistor R8. The advantages are as follows: the problem of low voltage and high voltage isolation is mainly solved, effective protection for a low-voltage device in case of high voltage abnormity is performed, and equipment safety is guaranteed.
Description
Technical field
The present invention relates to a kind of isolation and holding circuit, relate in particular a kind of isolation and holding circuit that is applied to high voltage electrified monitoring.
Background technology
At switch cubicle, be a kind of electric equipment, outside line enters master switch in cabinet, then enters sub-control switch, and as high-voltage chamber switch cabinet and low-tension switch cabinet, what have is also provided with high voltage bus, such as generating plant etc.Be high pressure conditions in switch cubicle, when it is detected, the isolation of high-tension electricity and low pressure is very important problem, and the safety that it is not only being related to low pressure use equipment is also being related to the safety of monitoring equipment.
Summary of the invention
The invention provides a kind of isolation and holding circuit that is applied to high voltage electrified monitoring, it has mainly solved the isolation of low pressure and high pressure, when High Abnormal Pressure, low-voltage equipment is effectively protected, and guarantees the safety of equipment.
For solving above-mentioned technical matters, the present invention by the following technical solutions:
Be applied to isolation and the holding circuit of high voltage electrified monitoring, it comprises resistance R 1 and resistance R 2, described resistance R 1 and resistance R 2 are in series, the non-common end grounding of described resistance R 2, described resistance R 1 and the common port of resistance R 2 are connected on the input end of photoelectrical coupler, the output terminal of described photoelectrical coupler is connected on the in-phase input end of comparer by resistance R 6, on the output terminal of described photoelectrical coupler, be connected with surging protection circuit, the output terminal of described photoelectrical coupler is connected on power supply by resistance R 7, on the inverting input of described comparer, be connected with bleeder circuit, the output terminal of described comparer is connected with resistance R 8.
Further technical scheme is:
As preferably, described surging protection circuit comprises resistance R 3 and electric capacity, and described resistance R 3 and electric capacity are in series, and the non-common port of described resistance R 3 is connected on the output terminal of photoelectrical coupler, the non-common end grounding of electric capacity.
Further, described bleeder circuit comprises resistance R 4 and resistance R 5, the non-common port of described resistance R 4 is connected on power supply, the non-common end grounding of described resistance R 5, and described resistance R 4 and the common port of resistance R 5 are connected on the inverting input of comparer.
Further, the resistance value ratio of described resistance R 4 and resistance R 5 is less than the resistance value ratio of resistance R 7 and resistance R 6.
Compared with prior art, the invention has the beneficial effects as follows:
The present invention utilizes optical coupling isolator to isolate completely high pressure and low pressure, when when abnormal, can the equipment of low pressure end be protected appears in high pressure, guarantees the safety of equipment.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Fig. 1 is circuit theory diagrams of the present invention.
Label in figure is: 1, input port; 2, output port.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further illustrated.Embodiments of the present invention include but not limited to the following example.
[embodiment]
The isolation that is applied to high voltage electrified monitoring and holding circuit as shown in Figure 1, it comprises resistance R 1 and resistance R 2, described resistance R 1 and resistance R 2 are in series, the non-common end grounding of described resistance R 2, described resistance R 1 and the common port of resistance R 2 are connected on the input end of photoelectrical coupler, the output terminal of described photoelectrical coupler is connected on the in-phase input end of comparer by resistance R 6, on the output terminal of described photoelectrical coupler, be connected with surging protection circuit, the output terminal of described photoelectrical coupler is connected on power supply by resistance R 7, on the inverting input of described comparer, be connected with bleeder circuit, the output terminal of described comparer is connected with resistance R 8.In the present invention; input port 1 is high input voltage port; high-tension electricity is input to photo-coupler after resistance R 1 and resistance R 2 current limlitings; the advantage such as electrical isolation, one-way transmission signal because photo-coupler has that antijamming capability is strong, between input and output; can effectively isolate high-pressure side and low pressure end, through photo-coupler, current signal is converted to effective isolation that low voltage signal is realized high pressure and low pressure, when high pressure occurs when abnormal; can protect the equipment of low pressure end, guarantee the safety of equipment.The output of photo-coupler flows to after comparer, by 2 pairs of equipment of comparer control output end mouth, is protected, and forms overvoltage protection.Surge protection circuit and effectively prevent the destruction of instantaneous pressure pulse to circuit component, it can absorb spike pulse high pressure.Resistance R 8 its metering functions, protect follow-up control section.
Described surging protection circuit comprises resistance R 3 and electric capacity, and described resistance R 3 and electric capacity are in series, and the non-common port of described resistance R 3 is connected on the output terminal of photoelectrical coupler, the non-common end grounding of electric capacity.The surging protection circuit in series that simply utilizes resistance R 3 and electric capacity, its circuit structure is simple, easy operating.Electric capacity can prevent voltage jump, absorbs the superpotential of kurtosis, and the resistance of series connection plays damping action, the superpotential energy of resistance consumption, thereby the vibration of inhibition circuit.The electric energy of resistance absorption electric capacity in parallel, prevents that the discharge current of electric capacity is excessive, avoids equipment to cause damage.
Described bleeder circuit comprises resistance R 4 and resistance R 5, and the non-common port of described resistance R 4 is connected on power supply, the non-common end grounding of described resistance R 5, and described resistance R 4 and the common port of resistance R 5 are connected on the inverting input of comparer.Utilize resistance R 4 and resistance R 5 bleeder circuit in series, to the inverting input of comparer, provide reference voltage.
In order to improve the protection intensity to equipment, described resistance R 4 and the resistance value ratio of resistance R 5 are less than the resistance value ratio of resistance R 7 and resistance R 6.The resistance value ratio of resistance R 4 and resistance R 5 is less than the resistance value ratio of resistance R 7 and resistance R 6, and reaction sensitivity that can intensifier circuit, can improve the protection intensity to equipment.
Be as mentioned above embodiments of the invention.The present invention is not limited to above-mentioned embodiment, and anyone should learn the structural change of making under enlightenment of the present invention, and every have identical or close technical scheme with the present invention, within all falling into protection scope of the present invention.
Claims (4)
1. be applied to isolation and the holding circuit of high voltage electrified monitoring, it is characterized in that: it comprises resistance R 1 and resistance R 2, described resistance R 1 and resistance R 2 are in series, the non-common end grounding of described resistance R 2, described resistance R 1 and the common port of resistance R 2 are connected on the input end of photoelectrical coupler, the output terminal of described photoelectrical coupler is connected on the in-phase input end of comparer by resistance R 6, on the output terminal of described photoelectrical coupler, be connected with surging protection circuit, the output terminal of described photoelectrical coupler is connected on power supply by resistance R 7, on the inverting input of described comparer, be connected with bleeder circuit, the output terminal of described comparer is connected with resistance R 8.
2. isolation and the holding circuit that is applied to high voltage electrified monitoring according to claim 1; it is characterized in that: described surging protection circuit comprises resistance R 3 and electric capacity; described resistance R 3 and electric capacity are in series; the non-common port of described resistance R 3 is connected on the output terminal of photoelectrical coupler, the non-common end grounding of electric capacity.
3. isolation and the holding circuit that is applied to high voltage electrified monitoring according to claim 1 and 2; it is characterized in that: described bleeder circuit comprises resistance R 4 and resistance R 5; the non-common port of described resistance R 4 is connected on power supply; the non-common end grounding of described resistance R 5, described resistance R 4 and the common port of resistance R 5 are connected on the inverting input of comparer.
4. isolation and the holding circuit that is applied to high voltage electrified monitoring according to claim 3, is characterized in that: described resistance R 4 and the resistance value ratio of resistance R 5 are less than the resistance value ratio of resistance R 7 and resistance R 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310568711.4A CN103645395A (en) | 2013-11-15 | 2013-11-15 | Isolation and protection circuit for high-voltage live-line monitoring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310568711.4A CN103645395A (en) | 2013-11-15 | 2013-11-15 | Isolation and protection circuit for high-voltage live-line monitoring |
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| Publication Number | Publication Date |
|---|---|
| CN103645395A true CN103645395A (en) | 2014-03-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310568711.4A Pending CN103645395A (en) | 2013-11-15 | 2013-11-15 | Isolation and protection circuit for high-voltage live-line monitoring |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105676034A (en) * | 2016-03-02 | 2016-06-15 | 国网天津市电力公司 | On-line monitoring method for fault of heater of switch cabinet |
| CN106997001A (en) * | 2017-02-20 | 2017-08-01 | 武汉大洋义天科技股份有限公司 | A kind of transmission line of electricity induced voltage wireless test apparatus |
| CN108872706A (en) * | 2017-05-09 | 2018-11-23 | 上海东缘机电设备有限公司 | The insulation of nuclear power station driving mechanism and direct resistance metering instrument |
Citations (4)
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| US4032843A (en) * | 1976-06-21 | 1977-06-28 | International Telephone And Telegraph Corporation | Compensated signal isolator |
| CN201867443U (en) * | 2010-10-21 | 2011-06-15 | 深圳拓邦股份有限公司 | Home appliance and mains supply strong current signal detection circuit thereof |
| CN202872618U (en) * | 2012-10-23 | 2013-04-10 | 常州能动电子科技有限公司 | High-voltage isolation dense module power supply |
| CN203759139U (en) * | 2013-11-15 | 2014-08-06 | 四川圣维信息技术有限公司 | Isolation and protection circuit for high-voltage live-line monitoring |
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2013
- 2013-11-15 CN CN201310568711.4A patent/CN103645395A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4032843A (en) * | 1976-06-21 | 1977-06-28 | International Telephone And Telegraph Corporation | Compensated signal isolator |
| CN201867443U (en) * | 2010-10-21 | 2011-06-15 | 深圳拓邦股份有限公司 | Home appliance and mains supply strong current signal detection circuit thereof |
| CN202872618U (en) * | 2012-10-23 | 2013-04-10 | 常州能动电子科技有限公司 | High-voltage isolation dense module power supply |
| CN203759139U (en) * | 2013-11-15 | 2014-08-06 | 四川圣维信息技术有限公司 | Isolation and protection circuit for high-voltage live-line monitoring |
Non-Patent Citations (2)
| Title |
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| 叶克江等: "基于光电耦合器的线性隔离方法及电路", 《现代电子技术》 * |
| 赵红强等: "模拟信号隔离技术用于高压电气监测", 《高低压电气专辑》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105676034A (en) * | 2016-03-02 | 2016-06-15 | 国网天津市电力公司 | On-line monitoring method for fault of heater of switch cabinet |
| CN105676034B (en) * | 2016-03-02 | 2018-08-31 | 国网天津市电力公司 | A kind of switchgear heater failure on-line monitoring method |
| CN106997001A (en) * | 2017-02-20 | 2017-08-01 | 武汉大洋义天科技股份有限公司 | A kind of transmission line of electricity induced voltage wireless test apparatus |
| CN108872706A (en) * | 2017-05-09 | 2018-11-23 | 上海东缘机电设备有限公司 | The insulation of nuclear power station driving mechanism and direct resistance metering instrument |
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Application publication date: 20140319 |