CN107394768B - Overcurrent sectional type voltage protector protection circuit for vacuum circuit breaker - Google Patents
Overcurrent sectional type voltage protector protection circuit for vacuum circuit breaker Download PDFInfo
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- CN107394768B CN107394768B CN201710756517.7A CN201710756517A CN107394768B CN 107394768 B CN107394768 B CN 107394768B CN 201710756517 A CN201710756517 A CN 201710756517A CN 107394768 B CN107394768 B CN 107394768B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/06—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using spark-gap arresters
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Abstract
The invention discloses an overcurrent sectional type voltage protector protection circuit for a vacuum circuit breaker, and belongs to the technical field of electric appliance protection. The system comprises a first leakage branch circuit, a third leakage branch circuit, a second leakage branch circuit and a leakage standby circuit, wherein the first leakage branch circuit, the second leakage branch circuit and the third leakage branch circuit are connected in parallel at the output end of a power supply main circuit; the second current monitoring comparator and the nonlinear resistor are respectively arranged at the current input end and the output end of the first leakage branch circuit; the leakage standby circuit is connected with the first leakage branch in parallel, and two ends of the leakage standby circuit are respectively and electrically connected with the power supply main circuit and the grounding circuit; a first current monitoring comparator is arranged on the power supply main circuit; and a starting circuit is arranged between the third leg of the first current monitoring comparator and the grounding circuit. The invention protects each other through the discharge gap and the nonlinear resistor, and is provided with the standby circuit to dump the clockwise current generated by the instantaneous overload voltage, thereby protecting the circuit and the electric appliance.
Description
Technical Field
The invention belongs to the technical field of electric appliance protection, and particularly relates to an overcurrent sectional type voltage protector protection circuit for a vacuum circuit breaker.
Background
The overvoltage protector is a new type of overvoltage protector, it is mainly used in power generation, power supply and enterprise power system, and can limit the operation overvoltage of power system and the overvoltage of phase and earth. The overvoltage protection device product has the protection function between phases and relative ground, so that the problem of the insulation damage of the operation overvoltage to equipment caused by the on-off of the vacuum switch is successfully solved. Makes great contribution to the electric power industry of China.
Disclosure of Invention
The invention aims to provide an overcurrent sectional type voltage protector protection circuit for a vacuum circuit breaker, and solves the existing problems.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention relates to an overcurrent sectional type voltage protector protection circuit for a vacuum circuit breaker, which comprises a first leakage branch circuit, a third leakage branch circuit, a second leakage branch circuit and a leakage standby circuit, wherein the first leakage branch circuit, the second leakage branch circuit and the third leakage branch circuit are connected in parallel at the output end of a power supply main circuit; the first leakage branch is provided with a second current monitoring comparator, a discharge gap and a nonlinear resistor, and the second current monitoring comparator and the nonlinear resistor are respectively arranged at the current input end and the current output end of the first leakage branch; a third current monitoring comparator and a fourth current monitoring comparator are respectively arranged on the second leakage branch and the third leakage branch; the leakage standby circuit is connected with the first leakage branch in parallel, and two ends of the leakage standby circuit are respectively and electrically connected with the power supply main circuit and the grounding circuit; a first current monitoring comparator is arranged on the power supply main circuit; a starting circuit is arranged between the third supporting leg of the first current monitoring comparator and the grounding circuit; an electromagnetic relay is arranged on the starting circuit, and a gap armature is arranged on the electromagnetic relay; the gap armature is arranged on the leakage standby circuit.
Further, a discharge gap and a nonlinear resistor are arranged on the second leakage branch and the third leakage branch. The discharge gap uses copper complex gold as a contact material, and the nonlinear resistor is made of a zinc oxide material.
Furthermore, the support legs of the first current monitoring comparator, the second current monitoring comparator, the third current monitoring comparator and the fourth current monitoring comparator are connected with the microprocessor.
Furthermore, a discharge gap and a nonlinear resistor are arranged on the grounding circuit.
Furthermore, a protection resistor is arranged on the starting circuit.
The invention has the following beneficial effects:
the invention adopts the four-star connection method, can greatly reduce the phase overvoltage, greatly improves the protection reliability, and protects the two by using the structure of the zinc oxide nonlinear resistor and the discharge gap. The discharge gap enables the chargeability of the zinc oxide resistor to be zero, the nonlinear characteristic of the zinc oxide resistor enables no follow current to exist after the discharge gap acts, the discharge gap does not bear the arc extinguishing task any more, and the service life of the product is prolonged.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a circuit diagram of the present invention;
in the drawings, the components represented by the respective reference numerals are listed below:
1-a power supply main circuit, 2-a leakage standby circuit, 3-a first leakage branch circuit, 4-a grounding circuit, 5-a third leakage branch circuit, 6-a second leakage branch circuit, 7-a microprocessor, 8-an electromagnetic relay, 9-a protective resistor, 10-a discharge gap, 11-a nonlinear resistor, 13-a gap armature, 101-a first current monitoring comparator, 301-a second current monitoring comparator, 401-a third current monitoring comparator and 501-a fourth current monitoring comparator.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention is an overcurrent sectional type voltage protector protection circuit for a vacuum circuit breaker, including a first leakage branch 3, a third leakage branch 5, a second leakage branch 6, a leakage standby circuit 2,
the first leakage branch circuit 3, the second leakage branch circuit 6 and the third leakage branch circuit 5 are connected in parallel at the output end of the main power supply circuit 1;
the first leakage branch 3 is provided with a second current monitoring comparator 301, a discharge gap 10 and a nonlinear resistor 11, and the second current monitoring comparator 301 and the nonlinear resistor 11 are respectively arranged at the current input end and the output end of the first leakage branch 3;
a third current monitoring comparator 401 and a fourth current monitoring comparator 501 are respectively arranged on the second leakage branch 6 and the third leakage branch 5;
the leakage standby circuit 2 is connected with the first leakage branch circuit 3 in parallel, and two ends of the leakage standby circuit 2 are respectively and electrically connected with the power supply main circuit 1 and the grounding circuit 4;
a first current monitoring comparator 101 is arranged on the power supply main circuit 1; a starting circuit is arranged between the third leg of the first current monitoring comparator 101 and the grounding circuit 4;
an electromagnetic relay 8 is arranged on the starting circuit, and a gap armature 13 is arranged on the electromagnetic relay 8;
the gap armature 13 is arranged on the leakage backup line 2.
The second leakage branch 6 and the third leakage branch 5 are both provided with a discharge gap 10 and a nonlinear resistor 11. The discharge gap 10 is formed of a copper-clad gold as a contact material, and the nonlinear resistor 11 is formed of a zinc oxide material.
The legs of the first current monitoring comparator 101, the second current monitoring comparator 301, the third current monitoring comparator 401 and the fourth current monitoring comparator 501 are connected with the microprocessor 7.
The ground line 4 is provided with a discharge gap 10 and a nonlinear resistor 11.
Wherein, a protective resistor 9 is arranged on the starting circuit.
One specific application of this embodiment is: after the installation is connected, when a vacuum switch on a protected circuit is disconnected, instantaneous overload voltage is generated, when current passes through the protection circuit, the overload current breaks down a discharge gap 10 and then flows through a nonlinear resistor 11, the resistance value of the nonlinear resistor 11 is reduced, the overload current is led into a ground wire through three leakage circuits, the normal current value generated after the clockwise overload voltage is eliminated is not enough to break down the discharge gap 10, and then the current passes through the normal circuit, when the three leakage circuits are damaged, when the current monitored by a first electric monitoring comparator 101 arranged on a power supply main circuit 1 exceeds the normal current, the current value measured by a current monitoring comparator arranged on a leakage branch circuit is zero, the starting circuit is discharged after the analysis processing of a microprocessor 7, so that an electromagnetic relay 8 works to close a gap armature 13, and a leakage standby circuit 2 is electrified, the overload current is conducted to the ground wire through the leakage standby circuit 2 to perform current inclination, so that the electrical appliance is protected.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (5)
1. The overcurrent sectional type voltage protector protection circuit for the vacuum circuit breaker comprises a first leakage branch circuit (3), a third leakage branch circuit (5), a second leakage branch circuit (6) and a leakage standby circuit (2), wherein the first leakage branch circuit (3), the second leakage branch circuit (6) and the third leakage branch circuit (5) are connected to the output end of a power supply main circuit (1) in parallel, a second current monitoring comparator (301), a discharge gap (10) and a nonlinear resistor (11) are arranged on the first leakage branch circuit (3), and the second current monitoring comparator (301) and the nonlinear resistor (11) are respectively arranged at the current input end and the output end of the first leakage branch circuit (3);
the discharge gap (10) uses copper complex gold as a contact material, and the nonlinear resistor (11) is made of a zinc oxide material; and a third current monitoring comparator (401) and a fourth current monitoring comparator (501) are respectively arranged on the second leakage branch (6) and the third leakage branch (5), and the device is characterized in that:
the leakage standby circuit (2) is connected with the first leakage branch circuit (3) in parallel, and two ends of the leakage standby circuit (2) are respectively and electrically connected with the power supply main circuit (1) and the grounding circuit (4);
a first current monitoring comparator (101) is arranged on the power supply main circuit (1); a starting circuit is arranged between the third support leg of the first current monitoring comparator (101) and the grounding circuit (4);
an electromagnetic relay (8) is arranged on the starting circuit, and a gap armature (13) is arranged on the electromagnetic relay (8);
the gap armature (13) is arranged on the leakage standby circuit (2).
2. The overcurrent segmented voltage protector protection circuit for a vacuum circuit breaker according to claim 1, wherein the second (6) and third (5) bleed branches are provided with a discharge gap (10) and a non-linear resistor (11).
3. The overcurrent segmented voltage protector protection circuit for a vacuum circuit breaker according to claim 1, wherein the legs of the first current monitoring comparator (101), the second current monitoring comparator (301), the third current monitoring comparator (401) and the fourth current monitoring comparator (501) are connected to the microprocessor (7).
4. The overcurrent segmented voltage protector protection circuit for a vacuum circuit breaker according to claim 1, wherein the ground line (4) is provided with a discharge gap (10) and a non-linear resistor (11).
5. The overcurrent segmented voltage protector protection circuit for a vacuum circuit breaker according to claim 1, wherein a protection resistor (9) is provided on the activation line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710756517.7A CN107394768B (en) | 2017-08-29 | 2017-08-29 | Overcurrent sectional type voltage protector protection circuit for vacuum circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710756517.7A CN107394768B (en) | 2017-08-29 | 2017-08-29 | Overcurrent sectional type voltage protector protection circuit for vacuum circuit breaker |
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| Publication Number | Publication Date |
|---|---|
| CN107394768A CN107394768A (en) | 2017-11-24 |
| CN107394768B true CN107394768B (en) | 2020-04-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710756517.7A Active CN107394768B (en) | 2017-08-29 | 2017-08-29 | Overcurrent sectional type voltage protector protection circuit for vacuum circuit breaker |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108493917B (en) * | 2018-03-23 | 2019-06-21 | 湖南大学 | Novel aerial drainage control device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2593439Y (en) * | 2003-01-03 | 2003-12-17 | 徐成飞 | Combined intelligent overvoltage protector |
| CN201868869U (en) * | 2010-12-02 | 2011-06-15 | 合肥伟创电力技术有限公司 | Combined type large-capacity self-separating overvoltage protector |
| CN202633933U (en) * | 2012-06-13 | 2012-12-26 | 合肥徽力电气技术有限公司 | Surge protector circuit of low-voltage power supply |
| CN203951159U (en) * | 2014-06-20 | 2014-11-19 | 天津协盛科技股份有限公司 | A kind of surge protector redundant system |
-
2017
- 2017-08-29 CN CN201710756517.7A patent/CN107394768B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2593439Y (en) * | 2003-01-03 | 2003-12-17 | 徐成飞 | Combined intelligent overvoltage protector |
| CN201868869U (en) * | 2010-12-02 | 2011-06-15 | 合肥伟创电力技术有限公司 | Combined type large-capacity self-separating overvoltage protector |
| CN202633933U (en) * | 2012-06-13 | 2012-12-26 | 合肥徽力电气技术有限公司 | Surge protector circuit of low-voltage power supply |
| CN203951159U (en) * | 2014-06-20 | 2014-11-19 | 天津协盛科技股份有限公司 | A kind of surge protector redundant system |
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| CN107394768A (en) | 2017-11-24 |
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