CN111551834B - Power frequency withstand voltage detection device and method for vacuum arc-extinguishing chamber - Google Patents
Power frequency withstand voltage detection device and method for vacuum arc-extinguishing chamber Download PDFInfo
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- CN111551834B CN111551834B CN202010498975.7A CN202010498975A CN111551834B CN 111551834 B CN111551834 B CN 111551834B CN 202010498975 A CN202010498975 A CN 202010498975A CN 111551834 B CN111551834 B CN 111551834B
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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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
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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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1254—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of gas-insulated power appliances or vacuum gaps
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Abstract
The invention discloses a power frequency withstand voltage detection device and method of a vacuum arc extinguish chamber, wherein the power frequency withstand voltage detection device of the vacuum arc extinguish chamber comprises the following components: the control switch, the voltage stabilizer, the voltage regulator, the transformer, the current transformer, the overcurrent relay and the time delay relay; the control switch is respectively connected with the power frequency power supply and the voltage stabilizer; the voltage stabilizer is connected with the voltage regulator, the voltage regulator is connected with the transformer, and the transformer is connected with the vacuum arc extinguish chamber; the delay relay is used for connecting the control switch and the voltage stabilizer after prolonging the set time threshold; the current transformer is connected between the voltage regulator and the transformer in series; the overcurrent relay detects whether a first current of a loop where the current transformer is located exceeds a set current threshold value; and when the first current exceeds a set current threshold, the delay relay is controlled to disconnect the control switch and the input end of the voltage stabilizer. The technical scheme provided by the invention solves the problem of large difference in power frequency withstand voltage detection of the vacuum arc-extinguishing chamber.
Description
Technical Field
The invention relates to the technical field of vacuum electronic devices, in particular to a power frequency withstand voltage detection device and method of a vacuum arc extinguish chamber.
Background
One of the finished product performances of vacuum electronic devices such as a vacuum arc-extinguishing chamber is power frequency withstand voltage, which is a hard index for whether the product is qualified or not in handover acceptance, and particularly, the power frequency withstand voltage index is the own performance of each product along with the application of a sealing and exhausting process on a vacuum device manufacturing production line.
In the prior art, the original sharp burrs are burnt out through multiple discharges in an aging process, and the power frequency withstand voltage of a vacuum electronic device is gradually improved. For a general vacuum electronic device, the aging voltage in the aging process is the operating voltage of the vacuum electronic device, but the aging voltage of the vacuum arc-extinguishing chamber is several times of the operating voltage of the vacuum arc-extinguishing chamber, for example, the aging voltage of the vacuum arc-extinguishing chamber can reach tens of kilovolts or more to hundreds of kilovolts.
At present, the power frequency withstand voltage detection process of the vacuum arc-extinguishing chamber has the following disadvantages: firstly, the difference of power frequency withstand voltage detection of vacuum arc-extinguishing chambers of a supplier and a client causes different detection results, and the logistics transportation between the two parties of a large number of products is caused; secondly, in the aging process of the manufacturing process of a manufacturer, in order to improve the reliability of the product, even the ultrahigh pressure aging process is adopted, metal steam attached to the inner wall of the vacuum insulating part is caused by over-processing to cause the reduction of power frequency withstand voltage and failure; thirdly, sampling detection is carried out by using impulse voltage detection equipment to judge whether the power frequency withstand voltage of a certain batch of vacuum arc-extinguishing chambers is qualified or not, and due to the limitation of the service life of the equipment and the long-time detection time, the processing period of aging detection is prolonged, and the aging cost of products is increased; fourthly, all the power frequency voltage withstand detection equipment of the vacuum arc extinguish chambers of all manufacturers have different detection results on the same sample.
Disclosure of Invention
The embodiment of the invention provides a device and a method for detecting power frequency withstand voltage of a vacuum arc-extinguishing chamber, and aims to solve the problem that the power frequency withstand voltage of the vacuum arc-extinguishing chamber has large detection difference.
In a first aspect, an embodiment of the present invention provides a power frequency withstand voltage detection apparatus for a vacuum arc-extinguishing chamber, including: the power frequency power supply, the control switch, the voltage stabilizer, the voltage regulator, the transformer, the current transformer, the overcurrent relay and the time delay relay;
the control switch is respectively connected with the power frequency power supply and the input end of the voltage stabilizer and is used for controlling the connection and disconnection between the power frequency power supply and the voltage stabilizer; the output end of the voltage stabilizer is connected with the input end of the voltage regulator, the output end of the voltage regulator is connected with the input end of the transformer, and the output end of the transformer is electrically connected with the vacuum arc-extinguishing chamber; the time delay relay is arranged between the control switch and the input end of the voltage stabilizer and is used for connecting the control switch and the input end of the voltage stabilizer after a set time threshold value is prolonged after the control switch is conducted;
the current transformer is connected between the output end of the voltage regulator and the input end of the transformer in series and used for detecting a first current between the voltage regulator and the transformer; the overcurrent relay is connected with the current transformer in series and used for detecting whether a first current of a loop where the overcurrent relay is located exceeds a set current threshold value; the overcurrent relay is connected with the time delay relay and used for controlling the time delay relay to disconnect the control switch and the input end of the voltage stabilizer when the first current exceeds a set current threshold.
In a second aspect, an embodiment of the present invention further provides a method for detecting a power frequency withstand voltage of a vacuum arc-extinguishing chamber, which is applicable to a device for detecting a power frequency withstand voltage of a vacuum arc-extinguishing chamber provided in any embodiment of the present invention, and includes:
placing the control switch in a conducting state;
starting a time delay relay to enable the control switch and the voltage stabilizer to be connected after a set time threshold is prolonged, so that the voltage stabilizer avoids exciting current generated at the moment that the control switch is in a conducting state;
the first current between the voltage regulator and the transformer is detected through the current transformer, the overcurrent relay is controlled to be in the state that the first current exceeds a set current threshold value, the time delay relay is controlled to be switched off, the control switch and the input end of the voltage stabilizer are controlled, and the power frequency withstand voltage of the vacuum arc extinguish chamber connected with the power frequency withstand voltage detection device is judged to be unqualified.
The power frequency withstand voltage detection device of the vacuum arc-extinguishing chamber comprises a power frequency power supply, a control switch, a voltage stabilizer, a voltage regulator, a transformer, a current transformer and an overcurrent relay; the control switch can be connected with a power frequency power supply and a voltage stabilizer, and the voltage stabilizer, the voltage regulator and the transformer are sequentially connected and used for modulating to form detection voltage for the vacuum arc-extinguishing chamber. The power frequency withstand voltage detection device of the vacuum arc extinguish chamber can further comprise a time delay relay, and the time delay relay can prolong the set time threshold value to establish connection between the control switch and the voltage stabilizer after the control switch is closed. The current transformer is connected in series between the output end of the voltage regulator and the input end of the transformer. The overcurrent relay is connected with the current transformer in series, so that when the first current of a loop where the current transformer is located exceeds a set current threshold value, the connection of the delay relay to the control switch and the voltage stabilizer is disconnected, and the unqualified power frequency withstand voltage of the vacuum arc-extinguishing chamber is judged according to the connection. Then the regulator and functional device afterwards can both effectively avoid the exciting current that power frequency power supply combined floodgate produced in the twinkling of an eye, exciting current is great, it is the great reason of detection difference between each vacuum interrupter's the power frequency withstand voltage detection device, this embodiment can effectively reduce the electric current size through the regulator, voltage regulator and transformer, reduce the commodity circulation operation of product between supplier and producer, improve the detection accuracy to vacuum interrupter, thereby the old concise technology standard of superhigh pressure for vacuum interrupter formulates and provides the basis, avoid because the condition that the product withstand voltage that the over-process was made became invalid.
Drawings
Fig. 1 is a schematic structural diagram of a power frequency withstand voltage detection device of a vacuum arc-extinguishing chamber according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a main circuit of a power frequency withstand voltage detection apparatus of a vacuum arc-extinguishing chamber according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a control circuit of a power frequency withstand voltage detection apparatus of a vacuum arc-extinguishing chamber according to an embodiment of the present invention;
fig. 4 is a schematic flow chart of a power frequency withstand voltage detection method for a vacuum arc-extinguishing chamber according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some structures related to the present invention are shown in the drawings, not all of them.
The embodiment of the invention provides a power frequency withstand voltage detection device of a vacuum arc-extinguishing chamber, which comprises: the power frequency power supply, the control switch, the voltage stabilizer, the voltage regulator, the transformer, the current transformer, the overcurrent relay and the time delay relay;
the control switch is respectively connected with the power frequency power supply and the input end of the voltage stabilizer and is used for controlling the connection and disconnection between the power frequency power supply and the voltage stabilizer; the output end of the voltage stabilizer is connected with the input end of the voltage regulator, the output end of the voltage regulator is connected with the input end of the transformer, and the output end of the transformer is electrically connected with the vacuum arc extinguish chamber; the time delay relay is arranged between the control switch and the input end of the voltage stabilizer and is used for connecting the control switch and the input end of the voltage stabilizer after the control switch is conducted and a set time threshold is prolonged;
the current transformer is connected between the output end of the voltage regulator and the input end of the transformer in series and used for detecting first current between the voltage regulator and the transformer; the overcurrent relay is connected with the current transformer in series and used for detecting whether a first current of a loop where the overcurrent relay is located exceeds a set current threshold value; the overcurrent relay is connected with the time delay relay and used for controlling the time delay relay to disconnect the control switch and the input end of the voltage stabilizer when the first current exceeds a set current threshold.
The power frequency withstand voltage detection device of the vacuum arc extinguish chamber comprises a power frequency power supply, a control switch, a voltage stabilizer, a voltage regulator, a transformer, a current transformer and an overcurrent relay; the control switch can be connected with a power frequency power supply and a voltage stabilizer, and the voltage stabilizer, the voltage regulator and the transformer are sequentially connected and used for modulating to form detection voltage for the vacuum arc-extinguishing chamber. The power frequency withstand voltage detection device of the vacuum arc-extinguishing chamber can further comprise a time delay relay, and the time delay relay can prolong the set time threshold value to establish connection between the control switch and the voltage stabilizer after the control switch is closed. The current transformer is connected in series between the output end of the voltage regulator and the input end of the transformer. The overcurrent relay is connected with the current transformer in series, so that when the first current of a loop where the current transformer is located exceeds a set current threshold value, the connection of the delay relay to the control switch and the voltage stabilizer is disconnected, and the unqualified power frequency withstand voltage of the vacuum arc-extinguishing chamber is judged according to the connection. Then the regulator and functional device afterwards can both effectively avoid the exciting current that power frequency power supply combined floodgate produced in the twinkling of an eye, exciting current is great, it is the great reason of detection difference between each vacuum interrupter's the power frequency withstand voltage detection device, this embodiment can effectively reduce the electric current size through the regulator, voltage regulator and transformer, reduce the commodity circulation operation of product between supplier and producer, improve the detection accuracy to vacuum interrupter, thereby the old concise technology standard of superhigh pressure for vacuum interrupter formulates and provides the basis, avoid because the condition that the product withstand voltage that the over-process was made became invalid.
The above is the core idea of the present invention, and the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention. All other embodiments, which can be obtained by a person skilled in the art based on the embodiments of the present invention without any creative work, belong to the protection scope of the present invention.
Fig. 1 is a schematic structural diagram of a power frequency withstand voltage detection apparatus for a vacuum interrupter provided in an embodiment of the present invention, and as shown in fig. 1, the power frequency withstand voltage detection apparatus for a vacuum interrupter includes a power frequency power supply 11, a control switch 12, a voltage regulator 13, a voltage regulator 14, a transformer 15, a current transformer 17, an overcurrent relay 18, and a delay relay 16.
Two ends of the control switch 12 are respectively connected with the power frequency power supply 11 and the voltage stabilizer 13, and are used for controlling the connection and disconnection between the power frequency power supply 11 and the voltage stabilizer 13. The output of stabiliser 13 is connected with the input of voltage regulator 14, and the output of voltage regulator 14 is connected with the input of transformer 15, and the output of transformer 15 is connected with vacuum interrupter 21, and then stabiliser 13, voltage regulator 14 and transformer 15 can carry out processing such as pressure regulating to power frequency power supply 11 to obtain vacuum interrupter 21's detection voltage, and output this detection voltage to vacuum interrupter 21 in order to detect vacuum interrupter 21's power frequency withstand voltage.
At the moment when the power supply 11 starts to supply power, the power supply 11 will generate a large exciting current and a large harmonic current to the voltage regulator 13, the voltage regulator 14 and the transformer 15, which are much higher than the steady-state currents. The present embodiment adds a delay relay 16 between the control switch 12 and the input of the voltage regulator 13. Then after the control switch 12 is turned on, the delay relay 16 will delay the set time threshold again to establish the connection between the control switch 12 and the input terminal of the voltage stabilizer 13, and then after the control switch 12 is turned on, the exciting current of the power frequency power supply 11 cannot be transmitted to the voltage stabilizer 13, the voltage regulator 14 and the transformer 15, so that the voltage stabilizer 13, the voltage regulator 14 and the transformer 15 avoid the large current, the accuracy of the final output detection voltage of the transformer 15 is improved, and the sensitivity of the power frequency withstand voltage detection of the vacuum arc-extinguishing chamber is improved. Optionally, the delay relay 16 may be an energized delay relay; the set time threshold is greater than or equal to 0.2 seconds. In this embodiment, the set time threshold is greater than or equal to 0.2 seconds, so that the power frequency withstand voltage detection device of the vacuum arc-extinguishing chamber can completely avoid the exciting current, and the detection accuracy is further improved. And the delay relay 16 is an energized delay relay, and when the control switch 12 is turned on, the delay relay 16 may be energized, and then the delay relay 16 may control the contact to act after setting the time threshold, and for example, the delay relay 16 may control the normally open contact to be closed after setting the time threshold, so that the control switch 12 is connected with the input end of the voltage stabilizer 13.
The current transformer 17 is arranged in series between the output of the voltage regulator 14 and the input of the transformer 15. In addition, the overcurrent relay 18 is arranged in the embodiment, the overcurrent relay 18 is arranged in the coil loop of the current transformer 17, and is not arranged between the output end of the voltage regulator 14 and the input end of the transformer 15, then the overcurrent relay 18 with small current and small power can be selected in the embodiment, for example, along with the gradual increase of the power frequency withstand voltage detection device, if the overcurrent relay 18 is arranged between the output end of the voltage regulator 14 and the input end of the transformer 15, the overcurrent relay 18 with larger power is needed, the occupied space is larger, the device cost is higher, the overcurrent relay 18 is connected into the small power system of the current transformer 17 in the embodiment, and the overcurrent relay 18 with small power can be selected. When the overcurrent relay 18 detects that the first current in the coil loop of the current transformer 17 exceeds the set current threshold, the delay relay 16 is required to disconnect the connection between the control switch 12 and the input end of the voltage stabilizer 13, that is, when the first current exceeds the set current threshold, the work of the power frequency withstand voltage detection device of the vacuum arc-extinguishing chamber is stopped, the set current threshold identifies that the vacuum arc-extinguishing chamber is broken down or has a large leakage current, that is, if the first current exceeds the set current threshold, the power frequency withstand voltage of the vacuum arc-extinguishing chamber is identified to be unqualified. Optionally, the set current threshold may be in a range of 0.5A to 1.0A. In this embodiment, the overcurrent relay 18 is connected in series with the current transformer 17, so that the range of the first current of the overcurrent relay 18 acting is 0.5A to 1.0A.
It should be noted that the power frequency withstand voltage detection device in this embodiment has strong applicability, and can be applied to power frequency withstand voltage detection of various vacuum electronic devices such as a vacuum arc-extinguishing chamber, so as to enhance the universality of the power frequency withstand voltage detection device in this embodiment, and solve the problems of high aging cost of various vacuum electronic devices, limited miniaturization and widening of products, and the like.
Optionally, referring to fig. 2 and fig. 3, fig. 2 is a schematic diagram of a main circuit structure of a power frequency withstand voltage detection apparatus of a vacuum arc-extinguishing chamber according to an embodiment of the present invention, fig. 3 is a schematic diagram of a control circuit structure of the power frequency withstand voltage detection apparatus of the vacuum arc-extinguishing chamber according to an embodiment of the present invention, and the power frequency withstand voltage detection apparatus of the vacuum arc-extinguishing chamber may include: a main circuit and a control circuit; referring to fig. 2, the main circuit includes a power frequency power supply, a control switch 12, a voltage stabilizer 13, a voltage regulator 14, a transformer 15, a current transformer 17, an overcurrent relay coil KA, a first normally open contact of the main contactor KM, and a second normally open contact of the main contactor KM; the control switch 12 is a double-pole single-throw switch; a first group of incoming lines of the control switch 12 are connected with a live wire L1 of a power frequency power supply, and a first group of outgoing lines are connected with a first input end of the voltage stabilizer 13 through a first normally open contact of the main contactor KM; a second group of incoming wires of the control switch 12 are connected with a zero line N1 of the power frequency power supply, and a second group of outgoing wires are connected with a second input end of the voltage stabilizer 13 through a second normally open contact of the main contactor KM; a first output end of the voltage regulator 13 is connected with a first input end of the voltage regulator 14; a second output end of the voltage regulator 13 is connected with a second input end of the voltage regulator 14; a first output terminal of the voltage regulator 14 is connected to a first input terminal of the transformer 15; a second output terminal of the voltage regulator 14 is connected to a second input terminal of the transformer 15; a first output end of the transformer 15 is connected with a first end of the vacuum arc-extinguishing chamber 21; a second output end of the transformer 15 is connected with a second end of the vacuum arc-extinguishing chamber 21; the current transformer 17 is arranged between the first output end of the voltage stabilizer 13 and the first input end of the voltage regulator 14; the overcurrent relay coil KA is connected with the current transformer 17 in series; referring to fig. 3, the control circuit includes a control power supply, a closing button QA1, a breaking button QA2, a delay relay coil SJ, a normally open contact SJ of the delay relay, a main contactor coil KM, and a normally closed contact KA of the overcurrent relay; the first end of the closing button QA1 is connected with a live wire L2 of a control power supply; the second end of the closing button QA1 is connected with the first end of the opening button QA 2; the second end of the opening button QA2 is connected with the input end of the main contactor coil KM through a normally open contact SJ of the delay relay; the output end of the main contactor coil KM is connected with a zero line N2 of a control power supply; an outlet wire of the opening button QA2 is connected with an input end of a delay relay coil SJ through a normally closed contact KA of the overcurrent relay; and the output end of the coil SJ of the time delay relay is connected with a zero line N2 of a control power supply.
The power frequency withstand voltage detection device of the vacuum arc-extinguishing chamber comprises a high-voltage main circuit and a low-voltage control circuit. The power frequency power supply comprises a live wire L1 and a zero wire N1, the control switch 12 is a double-pole single-throw switch and comprises two groups of inlet and outlet wires, one group of inlet and outlet wires corresponds to the live wire L1, and the other group of inlet and outlet wires corresponds to the zero wire N1, so that the live wire L1 and the zero wire N1 of the power frequency power supply are connected into the circuit at the same time. Specifically, a first group of incoming lines of the control switch 12 are connected with a live line L1 of the power frequency power supply, and a first group of outgoing lines are connected with a first input end of the voltage stabilizer 13 through a first normally open contact of the main contactor KM; the second group of incoming wires of the control switch 12 is connected with a zero line N1 of the power frequency power supply, the second group of outgoing wires is connected with a second input end of the voltage stabilizer 13 through a second normally open contact of the main contactor KM, a first output end of the voltage stabilizer 13 is connected with a first input end of the voltage regulator 14, a second output end of the voltage stabilizer 13 is connected with a second input end of the voltage regulator 14, a first output end of the voltage regulator 14 is connected with a first input end of the transformer 15, a second output end of the voltage regulator 14 is connected with a second input end of the transformer 15, and a first output end and a second output end of the transformer 15 are respectively connected with two ends of the vacuum arc extinguish chamber 21. Wherein, current transformer 17 sets up between the first output of stabiliser 13 and the first input of voltage regulator 14, and overcurrent relay coil KA and current transformer 17 series connection.
The control power supply of the control circuit comprises a live wire L2 and a zero wire N2, a closing button QA1 is connected with the live wire L2, the closing button QA1 and an opening button QA2 are sequentially connected, an opening button QA2 is connected with a main contactor coil KM through a normally open contact SJ of a delay relay, the main contactor coil KM is connected with the zero wire N2, the opening button QA2 is connected with a delay relay coil SJ through a normally closed contact KA of an overcurrent relay, and the delay relay coil SJ is connected with a zero wire N2. The main contactor is arranged in the embodiment, the first normally open contact KM and the second normally open contact KM of the main contactor are communicated with the on-off state between the control switch 12 and the voltage stabilizer 13, and the time delay relay can control the main contactor to work.
The following details are the power frequency withstand voltage detection process of the power frequency withstand voltage detection apparatus for a vacuum interrupter shown in fig. 2 and 3: firstly, a vacuum arc-extinguishing chamber is placed in a monitoring area as required, a main circuit and a control circuit of a power frequency withstand voltage detection device of the vacuum arc-extinguishing chamber are connected, a high-voltage discharging rod is taken off, an operator exits from a high-voltage operation room, an access door is closed, and a control switch 12 of the withstand voltage detection device of the vacuum arc-extinguishing chamber is opened; secondly, a switching-on button QA1 is pressed, a coil SJ of the delay relay is electrified, after the coil SJ of the delay relay is electrified to set a time threshold, a normally open contact SJ of the delay relay is closed, a coil KM of the main contactor is electrified to drive a first normally open contact KM and a second normally open contact K of the main contactor to be closed, so that the condition that exciting current flows through a voltage stabilizer 13, a voltage regulator 14 and a transformer 15 is avoided, and the vacuum arc extinguish chamber 21 is used for accurately detecting power frequency withstand voltage; then, when first electric current exceeded set current threshold value, overcurrent relay coil KA drove overcurrent relay's normally closed contact KA disconnection to time delay relay coil SJ outage, time delay relay's normally open contact SJ disconnection, thereby lead to main contactor coil KM outage, and then lead to the disconnection of main contactor's first normally open contact KM and second normally open contact K, the main circuit tripping, and it is lower, unqualified to judge current vacuum interrupter 21's power frequency withstand voltage.
With continuing reference to fig. 3, optionally, the control circuit may further include: a third normally open contact KM and a limit switch SQ of the main contactor; an incoming line of the limit switch SQ is connected with a live wire L2 of a control power supply through a third normally open contact KM of the main contactor; the outlet of limit switch SQ is connected to a first end of trip button QA 2.
After the main circuit is tripped, the voltage regulator 14 needs to be adjusted to the zero position, so that safety accidents caused when the main circuit is reclosed subsequently are avoided, and in order to prevent a user from forgetting to adjust the voltage regulator 14 to the zero position, a limit switch SQ is arranged in a control circuit. Limit switch SQ can be opened when regulator 14 is set to a zero position and closed when regulator 14 is not at a zero position. The limit switch SQ can be pressed by the closing button QA1 only after the regulator 14 is enabled to zero.
In this embodiment, the limit switch SQ is connected in series with the third normally open contact KM of the main contactor, that is, the incoming line of the limit switch SQ is connected with the live line L2 of the control power supply through the third normally open contact KM of the main contactor, and in addition, the outgoing line of the limit switch SQ is connected with the first end of the opening button QA 2. Then when limit switch SQ closed, closing button QA1 can't be closed, and main contactor coil KM can not be charged, leads to the unable start-up of vacuum interrupter's power frequency withstand voltage detection device to protect power frequency withstand voltage detection device.
Optionally, with continued reference to fig. 2, the main circuit may further comprise a first fuse FU1 and a second fuse FU 2; the first fuse FU1 is connected in series between the first group outgoing line of the control switch 12 and the first normally open contact KM of the main contactor; the second fuse FU2 is connected in series between the second set of outgoing lines of the control switch 12 and the second normally open contact KM of the main contactor. In the embodiment, fuses are arranged at the input end of the live wire L1 and the input end of the zero wire N1 of the high-voltage power frequency power supply, so that the high-frequency harmonic generated by the power frequency power supply is prevented from damaging the power frequency withstand voltage detection device.
With continuing reference to fig. 3, optionally, the control circuit may further include: third fuse FU3 and fourth fuse FU 4; the third fuse FU3 is arranged at the input end of a live wire L2 of the control power supply, and the fourth fuse FU4 is arranged at the output end of a zero wire N2 of the control power supply. Similarly, in the present embodiment, fuses are disposed at both the input end of the live line L2 and the input end of the neutral line N2 of the control power supply, so as to prevent the control unit from being damaged by high-frequency harmonics generated by the control power supply.
With continuing reference to fig. 3, optionally, the control circuit may further include: indicator light H1 and alarm bell HL; a first end of the indicator lamp H1 is connected with a second end of the opening button QA2, and a second end of the indicator lamp H1 is connected with a zero line N2 of a control power supply; the first end of the alarm bell HL is connected with the second end of the switch-off button QA2, and the second end of the alarm bell HL is connected with a zero line N2 of a control power supply. The indicator light H1 and the alarm bell HL emit light and give an alarm when the closing button QA1 is pressed, thereby warning the operator of leaving a high-voltage area and protecting personal and property safety. When the closing button QA1 is not pressed down or the opening button QA2 trips, the indicator lamp H1 and the alarm bell HL do not work, and the power frequency withstand voltage detection device of the vacuum arc-extinguishing chamber is not in a working state at the moment.
Based on the same conception, the embodiment of the invention also provides a power frequency withstand voltage detection method of the vacuum arc-extinguishing chamber. Fig. 4 is a schematic flow chart of a power frequency withstand voltage detection method for a vacuum interrupter provided in an embodiment of the present invention, and as shown in fig. 4, the method of this embodiment includes the following steps:
and step S110, putting the control switch into a conducting state.
And step S120, starting the delay relay, so that the control switch is connected with the voltage stabilizer after a set time threshold is prolonged, and the voltage stabilizer avoids exciting current generated at the moment when the control switch is in a conducting state.
For example, the time delay relay may be indirectly activated by a closing button or the like, so as to perform time delay control on the connection relationship between the control switch and the voltage regulator.
And S130, detecting a first current between the voltage regulator and the transformer through the current transformer, controlling the overcurrent relay to disconnect the control switch and the input end of the voltage stabilizer when the first current exceeds a set current threshold, and judging that the power frequency withstand voltage of the vacuum arc-extinguishing chamber connected with the power frequency withstand voltage detection device is unqualified.
In the implementation, the power frequency withstand voltage detection device of the vacuum arc-extinguishing chamber comprises a power frequency power supply, a control switch, a voltage stabilizer, a voltage regulator, a transformer, a current transformer and an overcurrent relay; the control switch can be connected with a power frequency power supply and a voltage stabilizer, and the voltage stabilizer, the voltage regulator and the transformer are sequentially connected and used for modulating to form detection voltage for the vacuum arc-extinguishing chamber. The power frequency withstand voltage detection device of the vacuum arc extinguish chamber can further comprise a time delay relay, and the time delay relay can prolong the set time threshold value to establish connection between the control switch and the voltage stabilizer after the control switch is closed. The current transformer is connected in series between the output end of the voltage regulator and the input end of the transformer. The overcurrent relay is connected with the current transformer in series, so that when the first current of a loop where the current transformer is located exceeds a set current threshold value, the connection of the delay relay to the control switch and the voltage stabilizer is disconnected, and the unqualified power frequency withstand voltage of the vacuum arc-extinguishing chamber is judged according to the connection. Then the regulator and functional device afterwards can both effectively avoid the exciting current that power frequency power supply combined floodgate produced in the twinkling of an eye, exciting current is great, it is the great reason of detection difference between each vacuum interrupter's the power frequency withstand voltage detection device, this embodiment can effectively reduce the electric current size through the regulator, voltage regulator and transformer, reduce the commodity circulation operation of product between supplier and producer, improve the detection accuracy to vacuum interrupter, thereby the old concise technology standard of superhigh pressure for vacuum interrupter formulates and provides the basis, avoid because the condition that the product withstand voltage that the over-process was made became invalid.
In the embodiment of the invention, the power frequency withstand voltage detection device of the vacuum arc-extinguishing chamber comprises a power frequency power supply, a control switch, a voltage stabilizer, a voltage regulator, a transformer, a current transformer and an overcurrent relay; the control switch can be connected with a power frequency power supply and a voltage stabilizer, and the voltage stabilizer, the voltage regulator and the transformer are sequentially connected and used for modulating to form detection voltage for the vacuum arc-extinguishing chamber. The power frequency withstand voltage detection device of the vacuum arc-extinguishing chamber can further comprise a time delay relay, and the time delay relay can prolong the set time threshold value to establish connection between the control switch and the voltage stabilizer after the control switch is closed. The current transformer is connected in series between the output end of the voltage regulator and the input end of the transformer and can detect the first current output by the voltage regulator. The overcurrent relay is connected with the current transformer in series, so that when the first current exceeds a set current threshold value, the connection of the delay relay to the control switch and the voltage stabilizer is disconnected, and the unqualified power frequency withstand voltage of the vacuum arc extinguish chamber is judged according to the connection. Then the regulator and functional device afterwards can both effectively avoid the exciting current that power frequency power supply combined floodgate produced in the twinkling of an eye, exciting current is great, it is the great reason of detection difference between each vacuum interrupter's the power frequency withstand voltage detection device, this embodiment can effectively reduce the electric current size through the regulator, voltage regulator and transformer, reduce the commodity circulation operation of product between supplier and producer, improve the detection accuracy to vacuum interrupter, thereby the old concise technology standard of superhigh pressure for vacuum interrupter formulates and provides the basis, avoid because the condition that the product withstand voltage that the over-process was made became invalid.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (7)
1. The utility model provides a power frequency withstand voltage detection device of vacuum interrupter which characterized in that includes: the power frequency power supply, the control switch, the voltage stabilizer, the voltage regulator, the transformer, the current transformer, the overcurrent relay and the time delay relay;
the control switch is respectively connected with the power frequency power supply and the input end of the voltage stabilizer and is used for controlling the connection and disconnection between the power frequency power supply and the voltage stabilizer; the output end of the voltage stabilizer is connected with the input end of the voltage regulator, the output end of the voltage regulator is connected with the input end of the transformer, and the output end of the transformer is electrically connected with the vacuum arc-extinguishing chamber; the time delay relay is arranged between the control switch and the input end of the voltage stabilizer and is used for connecting the control switch and the input end of the voltage stabilizer after a set time threshold value is prolonged after the control switch is conducted;
the current transformer is connected between the output end of the voltage regulator and the input end of the transformer in series; the overcurrent relay is connected with the current transformer in series and used for detecting whether a first current of a loop where the overcurrent relay is located exceeds a set current threshold value; the overcurrent relay is connected with the time delay relay and is used for controlling the time delay relay to disconnect the control switch and the input end of the voltage stabilizer when the first current exceeds a set current threshold;
vacuum interrupter's power frequency withstand voltage detection device includes: a main circuit and a control circuit;
the main circuit comprises the power frequency power supply, the control switch, the voltage stabilizer, the voltage regulator, the transformer, the current transformer, an overcurrent relay coil, a first normally open contact of a main contactor and a second normally open contact of the main contactor; the control switch is a double-pole single-throw switch;
a first group of incoming lines of the control switch are connected with a live wire of the power frequency power supply, and a first group of outgoing lines are connected with a first input end of the voltage stabilizer through a first normally open contact of the main contactor; a second group of incoming wires of the control switch are connected with a zero line of the power frequency power supply, and a second group of outgoing wires are connected with a second input end of the voltage stabilizer through a second normally open contact of the main contactor; the first output end of the voltage stabilizer is connected with the first input end of the voltage regulator; the second output end of the voltage stabilizer is connected with the second input end of the voltage regulator; the first output end of the voltage regulator is connected with the first input end of the transformer; the second output end of the voltage regulator is connected with the second input end of the transformer; the first output end of the transformer is connected with the first end of the vacuum arc extinguish chamber; the second output end of the transformer is connected with the second end of the vacuum arc extinguish chamber; the current transformer is arranged at the first output end of the voltage regulator and the first input end of the transformer; the overcurrent relay coil is connected with the current transformer in series;
the control circuit comprises a control power supply, a closing button, an opening button, a time delay relay coil, a normally open contact of the time delay relay, a main contactor coil and a normally closed contact of the overcurrent relay;
the first end of the closing button is connected with the live wire of the control power supply; the second end of the switching-on button is connected with the first end of the switching-off button; the second end of the opening button is connected with the input end of the main contactor coil through a normally open contact of the time delay relay; the output end of the main contactor coil is connected with a zero line of the control power supply; the outgoing line of the opening button is connected with the input end of the delay relay coil through a normally closed contact of the overcurrent relay; the output end of the time delay relay coil is connected with a zero line of the control power supply;
the control circuit further includes: a third normally open contact and a limit switch of the main contactor;
the incoming line of the limit switch is connected with the live wire of the control power supply through a third normally open contact of the main contactor; and the outgoing line of the limit switch is connected with the first end of the opening button.
2. The power frequency withstand voltage detection device of the vacuum arc-extinguishing chamber according to claim 1, characterized in that: the range of the set current threshold is 0.5A-1.0A.
3. The power frequency withstand voltage detection device of the vacuum arc-extinguishing chamber according to claim 1, characterized in that: the delay relay is a power-on delay relay; the set time threshold is greater than or equal to 0.2 seconds.
4. The power frequency withstand voltage detection device of the vacuum interrupter as claimed in claim 1, wherein the main circuit further comprises a first fuse and a second fuse;
the first fuse is connected between a first group of outgoing lines of the control switch and a first normally open contact of the main contactor in series; and the second fuse is connected between a second group outgoing line of the control switch and a second normally open contact of the main contactor in series.
5. The power frequency withstand voltage detecting apparatus for a vacuum interrupter as claimed in claim 1, wherein the control circuit further comprises: a third fuse and a fourth fuse;
the third fuse set up in the live wire input of control power supply, the fourth fuse set up in the zero line output of control power supply.
6. The power frequency withstand voltage detection device of the vacuum interrupter according to claim 1, wherein the control circuit further comprises: indicator lights and alarm bells;
the first end of the indicator light is connected with the second end of the opening button, and the second end of the indicator light is connected with a zero line of the control power supply; the first end of the alarm bell is connected with the second end of the opening button, and the second end of the alarm bell is connected with the zero line of the control power supply.
7. A power frequency withstand voltage detection method for a vacuum interrupter, the power frequency withstand voltage detection method being applied to the vacuum interrupter according to any one of claims 1 to 6, the method comprising:
placing the control switch in a conducting state;
starting a time delay relay to enable the control switch and the voltage stabilizer to be connected after a set time threshold is prolonged, so that the voltage stabilizer avoids exciting current generated at the moment that the control switch is in a conducting state;
the first current between the voltage regulator and the transformer is detected through the current transformer, the overcurrent relay is controlled to be in the state that the first current exceeds a set current threshold value, the time delay relay is controlled to be switched off, the control switch and the input end of the voltage stabilizer are controlled, and the power frequency withstand voltage of the vacuum arc extinguish chamber connected with the power frequency withstand voltage detection device is judged to be unqualified.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201548579U (en) * | 2009-09-30 | 2010-08-11 | 东莞市大忠电子有限公司 | Delayed-response transducer for withstand voltage test of transformer |
| JP2014098643A (en) * | 2012-11-15 | 2014-05-29 | Calsonic Kansei Corp | Voltage measurement circuit |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1220066C (en) * | 2003-09-05 | 2005-09-21 | 西安福润德电子科技有限公司 | Intelligent AC-DC withstand voltage test apparatus |
| CN101718835B (en) * | 2009-11-23 | 2011-01-26 | 泰兴市航联电连接器有限公司 | Comprehensive insulation and voltage resistance testing device of electric connector |
| CN201681138U (en) * | 2010-03-26 | 2010-12-22 | 彭发荣 | Lightweight type generator power-frequency alternating-current withstand voltage tester |
| CN201765299U (en) * | 2010-08-26 | 2011-03-16 | 孟州市电力公司 | AC withstand voltage tester |
| CN102346244A (en) * | 2011-06-17 | 2012-02-08 | 杭州炬华科技股份有限公司 | Programmed withstand-voltage test bench |
| CN206431235U (en) * | 2016-12-21 | 2017-08-22 | 北京太格时代自动化系统设备有限公司 | A kind of industrial frequency withstand voltage detection device |
| CN108387828B (en) * | 2018-05-30 | 2023-09-29 | 南宁市高照电器有限责任公司 | Alternating-current withstand voltage testing device and testing method thereof |
| CN108761314A (en) * | 2018-07-06 | 2018-11-06 | 广东格兰仕集团有限公司 | Electric-controlled plate automatic checkout equipment and its detection method |
-
2020
- 2020-06-04 CN CN202010498975.7A patent/CN111551834B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201548579U (en) * | 2009-09-30 | 2010-08-11 | 东莞市大忠电子有限公司 | Delayed-response transducer for withstand voltage test of transformer |
| JP2014098643A (en) * | 2012-11-15 | 2014-05-29 | Calsonic Kansei Corp | Voltage measurement circuit |
Non-Patent Citations (1)
| Title |
|---|
| 配电网电气设备的耐压试验装置及应用研究;张鸣;《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》;20170315;全文 * |
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