CN112098832A - Device for detecting tripping characteristic of pole-mounted circuit breaker - Google Patents
Device for detecting tripping characteristic of pole-mounted circuit breaker Download PDFInfo
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- CN112098832A CN112098832A CN202010986073.8A CN202010986073A CN112098832A CN 112098832 A CN112098832 A CN 112098832A CN 202010986073 A CN202010986073 A CN 202010986073A CN 112098832 A CN112098832 A CN 112098832A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
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Abstract
The invention relates to a tripping characteristic detection device of a pole-mounted circuit breaker, which comprises an inverter (1) connected with a direct current input end (12), and a voltage regulation shunt and a voltage loss regulation shunt which are respectively connected with a three-phase alternating current output end of the inverter (1), wherein the voltage regulation shunt is connected with a power supply side three-phase output end (10) and a load side three-phase output end (11), the voltage loss regulation shunt is connected with the power supply side three-phase output end (10), and the inverter, the voltage regulation shunt, the voltage loss regulation shunt, the power supply side three-phase output end (10) and the load side three-phase output end (11) form a three-phase detection loop. Compared with the prior art, the invention has the advantages of high detection efficiency, low cost, no need of climbing rod detection and the like.
Description
Technical Field
The invention relates to an electric instrument, in particular to a device for detecting the tripping characteristic of a pole-mounted circuit breaker.
Background
The pole-mounted circuit breaker is used for connection, segmentation and branch lines in a power grid and is a core component of a modern intelligent distribution network. The pole-mounted circuit breaker is a power device with higher integration level, and integrates primary and secondary devices such as analog quantity acquisition, relay protection, a circuit breaker arc extinguishing mechanism and the like, so that more new requirements are met for the characteristic test of the pole-mounted circuit breaker.
Because the circuit breakers on the column are often dispersedly installed on the electric poles of all distribution network branch lines, the difficulty of testing the characteristics of the circuit breakers is high, particularly, the tests of the tripping characteristics and the relay protection action characteristics of the circuit breakers are completed by climbing poles, however, general secondary professionals do not have the ability of climbing poles and working high above the ground, and maintainers with the ability of working high above the ground do not have the professional knowledge of secondary control protection equipment, so that the field detection of the circuit breakers on the column needs multiple kinds of coordination, the working efficiency is very low, the number of the circuit breakers on the column is extremely large, and a plurality of power supply departments often cannot check all the circuit breakers in the district according to time, and potential hazards are caused to the future operation. And in summer high-temperature seasons, sudden fault burning or false tripping accidents of the circuit breaker on the column occur. However, under the existing conditions, almost no method and habit for performing power failure verification or live detection on the pole-mounted circuit breaker of an important loop exists, so that if equipment capable of conveniently detecting the operation condition of the pole-mounted circuit breaker can be developed, the operation reliability of a distribution network is favorably improved greatly.
The prior art generally adopts a tripping scheme based on a high-current generator, however, the scheme has the following defects: 1) the use is inconvenient: the pole-mounted circuit breakers are distributed and mounted in a large number, the large-current generator is very heavy, and a 1000A large-current generator is over 30 kilograms, so that great inconvenience is brought to on-site movement detection operation; in addition, the current large-current generator is single-phase output for considering the convenience of power supply, and the circuit breaker on the three-phase column needs to be tested for three times to realize detection, thereby increasing the inconvenience of operation. 2) The real load current variation process cannot be simulated. 3) The cost is high: the switch trip characteristic detection device based on the large current generator design in the prior art needs a primary current transformer and an auto-coupling voltage regulator with large capacity, and because both are power frequency single-phase inductive elements, the device consumes much copper and iron, the price of a 1000A product is at least more than ten thousand yuan, and the cost is high.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the device for detecting the tripping characteristic of the pole-mounted circuit breaker, which has high detection efficiency and low cost and can detect the real arc extinguishing capability and the three-phase synchronization characteristic of a switch.
The purpose of the invention can be realized by the following technical scheme:
the utility model provides a circuit breaker tripping characteristic detection device on post, includes the dc-to-ac converter of being connected with direct current input, the voltage regulation that is connected respectively with the three-phase AC output of dc-to-ac converter is shunted and is regulated the branch way with the decompression, the voltage regulation is shunted and is connected power side three-phase output, load side three-phase output, the decompression is regulated and is shunted and connect power side three-phase output, the dc-to-ac converter the voltage regulation is shunted the decompression is regulated the branch way power side three-phase output with load side three-phase output constitutes the three-phase.
The voltage-loss adjusting shunt circuit comprises three-phase voltage-loss buttons, three voltage transformers and three voltmeters, the voltage-loss buttons of all the phases are connected with a low-voltage winding of one voltage transformer and one voltmeters in parallel, a common end of a high-voltage winding of each voltage transformer is connected with a zero phase in parallel, and phase line ends of each voltage transformer are connected with a three-phase output end of a power supply side.
The voltage regulating branch circuit comprises a voltage regulator, an ammeter and a current adding button, wherein the three-phase output end of the voltage regulator is respectively connected with the ammeter and a primary winding of a primary current transformer after being connected with the current adding button in series, and secondary windings of the primary current transformers are respectively connected with a power supply side three-phase output end and a load side three-phase output end.
Furthermore, a primary winding of a secondary current transformer is also connected in series in a zero-phase loop of the three-phase output end of the voltage regulator, and a secondary winding of the secondary current transformer is connected with a signal input end of the electric signal timer.
In actual work, the inverter converts a direct-current low-voltage power supply into alternating-current voltage, different voltages are set through a three-phase voltage regulator, and then a primary current transformer is connected in an inverted mode to achieve current amplification, so that three-phase test current of the pole-mounted circuit breaker is generated; the inverter is reversely connected and boosted through a voltage transformer by three-phase no-voltage buttons and current adding buttons to form three-phase test voltage of the pole-mounted circuit breaker; in the detection process, if the three-phase no-voltage button and each current-applying button are switched off simultaneously, the synchronism of the three-phase detection loop is good, the electric signal timer displays the short time of the unbalanced current in the zero phase, and if the action of one phase in the three-phase detection loop is slow or the arc extinguishing capability is reduced, the electric signal timer displays the long lasting time of the unbalanced current in the zero phase.
Furthermore, the three voltage transformers are three single-phase voltage transformers which are independent from each other.
Furthermore, each primary current transformer is a single-phase current transformer which is independent from each other.
Furthermore, the three-phase no-voltage button and each current-applying button are normally closed contact buttons.
Compared with the prior art, the device for detecting the tripping characteristic of the pole-mounted circuit breaker at least has the following beneficial effects:
1) detection efficiency is high, but three-phase simultaneous detection: the invention adopts the inverter to realize the output current regulation, and because the inverter has the inherent AC-DC-AC conversion function, the common single-phase power supply can be used for generating three-phase detection current, thereby realizing the simultaneous detection of three phases of the three-phase switch and greatly improving the field detection operation efficiency;
2) the cost is low: the invention can use the scrapped current-voltage transformer which is close to the service life to realize the functions of the step-up transformer and the step-up transformer, the cost is less than one third of the cost of the prior art, and the scrapped idle equipment is fully utilized, thereby having the outstanding effects of recycling resources and turning waste into valuable;
3) the pole climbing test is not needed: according to the invention, the pole-mounted circuit breaker can be conveniently tested on the ground only by hanging six test rods, so that the problems of complicated pole-mounting test and potential safety hazard are avoided, and the field operation efficiency is further improved;
4) the real arc extinguishing capability and the three-phase synchronization characteristic of the detectable switch are as follows: the invention skillfully utilizes the capability of simultaneously detecting three phases, and utilizes the electric signal timer to time zero-phase current, so as to detect the synchronism of three-phase actions and fundamentally discover the potential danger of three-phase inconsistency possibly existing in the switch;
5) primary and secondary items can be detected simultaneously: according to the invention, through the primary side injection flow, the action time limit and the three-phase synchronism of the circuit breaker can be detected, and the relay protection action accuracy can also be detected, so that the capability of simultaneously detecting the primary function and the secondary function at one time is realized, and the improvement of the operation efficiency is self-evident;
6) utilize simple means to cover the vast majority of detection project of circuit breaker on the post, thoroughly avoided the hidden danger of switch operation with illness: the measures adopted by the invention are from cheap idle or obsolete equipment, and the comprehensive detection of the operating health degree of the pole-mounted circuit breaker is realized with extremely low cost.
Drawings
Fig. 1 is a schematic structural diagram of a trip characteristic detecting device of a pole top circuit breaker in an embodiment;
the reference numbers in the figures indicate:
1. the device comprises an inverter, 2, a voltage regulator, 3, a primary current transformer, 4, an electric signal timer, 5, a secondary current transformer, 6, an ammeter, 7, a voltage transformer, 8, a voltmeter, 10, a power supply side three-phase output end, 11, a load side three-phase output end, 12, a direct current input end, 13, a current-on button, 14 and a voltage-loss button.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.
Examples
As shown in fig. 1, the present invention relates to a device for detecting a trip characteristic of a pole-mounted circuit breaker, which includes an inverter 1, a voltage regulator 2, a primary current transformer 3, an electric signal timer 4, a secondary current transformer 5, a three-phase current meter 6, a three-phase voltage transformer 7, a three-phase voltmeter 8, a power-supply-side three-phase output terminal 10, a load-side three-phase output terminal 11, a dc input terminal 12, an applied current button 13 and a no-voltage button 14.
The direct current power supply input end of the inverter 1 is connected with the direct current input end 12, the three-phase alternating current output end of the inverter 1 is divided into two paths, one path is connected with the input end of the voltage regulator 2, and the three phases of the other path are respectively connected with the no-voltage button 14.
The three-phase output end of the voltage regulator 2 is respectively connected with the ammeter 6 and the primary winding of the primary current transformer 3 after being connected with the current button 13 in series; the secondary windings of the primary current transformers 3 are respectively connected with a power supply side three-phase output end 10 and a load side three-phase output end 11.
The zero-phase loop of the three-phase output end of the voltage regulator 2 is also connected in series with a primary winding of a secondary current transformer 5, and a secondary winding of the secondary current transformer 5 is connected with the signal input end of the electric signal timer 4. The electric signal timer 4 is used for recording the unbalanced current time existing in the zero phase, reflecting the synchronism of the three-phase action through the display of the length and the length of the display time, and further finding the arc extinguishing problem or the three-phase inconsistency problem.
The three-phase no-voltage button 14 is also respectively connected with the low-voltage windings of the three voltage transformers 7 and the three voltmeters 8 in parallel; the common ends of the high-voltage windings of the voltage transformers 7 are connected in parallel to form a zero phase, and the phase line ends are respectively connected with a three-phase output end 10 on the power supply side. The three voltage transformers 7 are three independent single-phase voltage transformers; each primary current transformer 3 is an independent single-phase current transformer.
The three-phase no-voltage button 14 and each current-applying button 13 are normally closed contact buttons.
The principle of the invention is to trip the circuit breaker on the tested column by using large current and then detect whether each action characteristic meets the requirement, but the realization mode is different from the prior art, thereby obtaining more outstanding beneficial effects.
Firstly, a large number of scrapped current-voltage transformers close to the service life are arranged in an electric power enterprise or other production plants, related enterprises and the like, the invention can skillfully utilize the idle equipment to realize the functions of a current-boosting transformer and a voltage-boosting transformer, a direct-current low-voltage power supply, such as a 12V storage battery for overhauling a vehicle, is converted into higher alternating-current voltage through an inverter, and after different voltages are set through a three-phase voltage regulator, the current is amplified by the reverse connection of a primary current transformer, so that the generation of three-phase test current of the pole-mounted circuit breaker is realized; the pole-mounted circuit breaker protection has low requirements on voltage, and only low-voltage tripping needs to be verified and managed, so that the three-phase voltage is not regulated by a voltage regulator, and the three-phase test voltage of the pole-mounted circuit breaker is formed after the voltage transformer is reversely connected and boosted through a normally closed contact button. Because the test current and the test voltage are high-voltage signals injected at the primary side, the primary equipment and the secondary equipment are ensured to be tested simultaneously, the global performance and the high efficiency of the test are realized, the scrapped idle equipment is fully utilized, and the outstanding effects of resource recycling and waste-to-treasure conversion are achieved.
Secondly, the invention realizes the detection of the zero-phase current by constructing a three-phase detection loop, and can sensitively reflect the arc extinguishing problem or the three-phase inconsistency problem by the timing of the electric signal timer in the zero phase.
The invention is also very convenient to use, and only six signal output ends of three phases need to be hung on two sides of the three-phase fracture of the tested pole-mounted circuit breaker.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and those skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. The utility model provides a circuit breaker tripping characteristic detection device on post, its characterized in that includes inverter (1) of being connected with direct current input (12), the pressure regulating that is connected respectively with the three-phase alternating current output of inverter (1) is shunted and is regulated the branch way with the decompression, the pressure regulating is shunted and is connected power side three-phase output (10), load side three-phase output (11), the decompression is regulated and is connected power side three-phase output (10) along separate routes, the inverter the pressure regulating is shunted the decompression is regulated the branch way power side three-phase output (10) with load side three-phase output (11) constitute the three-phase detection return circuit.
2. The pole break trip characteristic detection device according to claim 1, wherein the no-voltage regulating shunt circuit comprises three-phase no-voltage buttons (14), three voltage transformers (7) and three voltmeters (8), the no-voltage button (14) of each phase is respectively connected in parallel with a low-voltage winding of one of the voltage transformers (7) and one of the voltmeters (8), a common end of a high-voltage winding of each of the voltage transformers (7) is connected in parallel to form a zero phase, and a phase end of each of the voltage transformers (7) is respectively connected with a power-supply-side three-phase output terminal (10).
3. The trip characteristic detection device of the pole-mounted circuit breaker according to claim 2, wherein the voltage regulating branch comprises a voltage regulator (2), an ammeter (6) and a current applying button (13), the three-phase output end of the voltage regulator (2) is respectively connected with the ammeter (6) and the current applying button (13) in series and then is connected with the primary winding of one primary current transformer (3), and the secondary winding of each primary current transformer (3) is respectively connected with the three-phase output end (10) at the power supply side and the three-phase output end (11) at the load side.
4. The trip characteristic detection device of the pole-mounted circuit breaker according to claim 3, characterized in that a primary winding of a secondary current transformer (5) is further connected in series in a zero-phase loop of the three-phase output end of the voltage regulator (2), and a secondary winding of the secondary current transformer (5) is connected with a signal input end of the electric signal timer (4).
5. The trip characteristic detection device of the pole-mounted circuit breaker according to claim 4, wherein the inverter (1) converts a direct-current low-voltage power supply into an alternating-current voltage, and after different voltages are set through the three-phase voltage regulator (2), a primary current transformer (3) is connected in a reverse mode to achieve current amplification, so that three-phase test currents of the pole-mounted circuit breaker are generated; the inverter (1) is reversely connected and boosted through a voltage transformer (7) through three-phase no-voltage buttons (14) and current adding buttons (13) to form three-phase test voltage of the pole circuit breaker; in the detection process, if the three-phase voltage-loss button (14) and each current-adding button (13) are switched off simultaneously, the synchronism of the three-phase detection loop is good, the electric signal timer displays the short time of the unbalanced current in the zero phase, and if the action of one phase in the three-phase detection loop is slow or the arc extinguishing capability is reduced, the electric signal timer displays the long lasting time of the unbalanced current in the zero phase.
6. The apparatus for detecting the trip characteristics of a pole break circuit breaker according to claim 2, characterized in that the three voltage transformers (7) are three single-phase voltage transformers independent of each other.
7. The trip characteristic detecting device of a pole top circuit breaker according to claim 3, wherein each primary current transformer (3) is a single-phase current transformer independent of each other.
8. The trip characteristic detecting device of a pole break circuit breaker according to claim 3, wherein the three-phase no-voltage button (14) and each current-applying button (13) are normally closed contact buttons.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010986073.8A CN112098832A (en) | 2020-09-18 | 2020-09-18 | Device for detecting tripping characteristic of pole-mounted circuit breaker |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010986073.8A CN112098832A (en) | 2020-09-18 | 2020-09-18 | Device for detecting tripping characteristic of pole-mounted circuit breaker |
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| CN202010986073.8A Pending CN112098832A (en) | 2020-09-18 | 2020-09-18 | Device for detecting tripping characteristic of pole-mounted circuit breaker |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108535645A (en) * | 2018-04-24 | 2018-09-14 | 国网湖北省电力有限公司电力科学研究院 | A kind of one or two test for fusion methods of pole-mounted circuit breaker defencive function |
| CN110794300A (en) * | 2019-11-19 | 2020-02-14 | 国网湖北省电力有限公司电力科学研究院 | Three-phase full-voltage test power supply of breaker on primary and secondary fusion complete set of column |
| CN110907817A (en) * | 2019-12-13 | 2020-03-24 | 上海华电电力发展有限公司望亭发电分公司 | Air switch tripping characteristic detection device |
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2020
- 2020-09-18 CN CN202010986073.8A patent/CN112098832A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108535645A (en) * | 2018-04-24 | 2018-09-14 | 国网湖北省电力有限公司电力科学研究院 | A kind of one or two test for fusion methods of pole-mounted circuit breaker defencive function |
| CN110794300A (en) * | 2019-11-19 | 2020-02-14 | 国网湖北省电力有限公司电力科学研究院 | Three-phase full-voltage test power supply of breaker on primary and secondary fusion complete set of column |
| CN110907817A (en) * | 2019-12-13 | 2020-03-24 | 上海华电电力发展有限公司望亭发电分公司 | Air switch tripping characteristic detection device |
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