CN117434438A - Contact opening and closing power frequency withstand voltage test device of high-voltage vacuum switch - Google Patents
Contact opening and closing power frequency withstand voltage test device of high-voltage vacuum switch Download PDFInfo
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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
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3272—Apparatus, systems or circuits therefor
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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
Abstract
The invention provides a contact opening and closing power frequency withstand voltage test device of a high-voltage vacuum switch, which belongs to the technical field of withstand voltage detection of the high-voltage vacuum switch, and comprises a power frequency high-voltage generation unit, a high-voltage detection unit and a test unit; the output end of the power frequency high-voltage generating unit is connected with the input end of the high-voltage detecting unit, and the output end of the power frequency high-voltage generating unit is connected with the input end of the testing unit; the power frequency high voltage generating unit is used for inducing the power frequency high voltage from the alternating voltage through the voltage regulator and the transformer and raising the power frequency withstand voltage value to the required power frequency high voltage; the times of the withstand voltage test are adjusted through a time relay; the high-voltage detection unit is used for detecting a voltage effective value and a current effective value of the high-voltage of the power frequency through the current transformer and the voltage transformer; the test unit is used for storing electric energy during detection of the contact of the target high-voltage vacuum switch through the capacitive device, and realizing power frequency voltage withstand detection of opening and closing of the contact. The invention greatly improves the breaking capacity of the vacuum switch contact and obviously reduces the probability of heavy-duty breakdown.
Description
Technical Field
The invention belongs to the technical field of high-voltage vacuum switch withstand voltage detection, and particularly relates to a power frequency withstand voltage test device for switching contacts of a high-voltage vacuum switch.
Background
The power system is an organic whole formed by various links such as power generation, power transmission, transformation, power distribution, power consumption and the like, and an intermediate link between power generation and power consumption, which belongs to transmission and distribution, is generally called a power grid for short. Safety and stability are the most basic conditions for the grid to operate properly. The power grid is stable, and is in a state that the power grid can continuously supply power to the load normally; the stable damage can lead to the collapse of the power grid and large-area power failure accidents. The safe and stable operation of the power grid has a particularly important significance, which is determined by the characteristics of power production and the serious consequences of grid accidents. The high-voltage vacuum switch has the advantages of small volume, less pollution, convenient operation and the like, improves the breaking capacity of the contact, reduces the damage of the contact and has high reliability, so the high-voltage vacuum switch is commonly used in the construction of a power grid, and plays a role in controlling and protecting high-voltage equipment in the operation process. The high-voltage vacuum switch is a circuit breaker which uses vacuum as insulation and arc extinction, and comprises the following components: vacuum interrupter, operating device and support and other parts. The arc extinguishing medium of the vacuum switch and the insulating medium of the contact gap after arc extinguishing are both in high vacuum. The greatest feature of vacuum switches compared to other switches is that the contacts and arc extinguishing system are extremely simple. The switch has the remarkable advantages of small volume, light weight, long service life, suitability for frequent operation, no maintenance of the arc extinguishing chamber and the like, which are not possessed by other switch products. The vacuum arc-extinguishing chamber, also called vacuum switch tube, is a core component of high-voltage vacuum switch, and has the main function of using high vacuum in the tube as arc-extinguishing insulating medium to make the high-voltage circuit quickly extinguish arc and inhibit current after cutting off power supply, so as to avoid accidents and accidents. When the vacuum switch is used for switching on and off, the operating mechanism outside the vacuum arc-extinguishing chamber is used for making the pair of opposite contact systems of the arc-extinguishing chamber to complete, and when the switch works, the steady-state temperature rise of each part of the arc-extinguishing chamber can not exceed the allowable value so as to ensure the reliable work of the switch. The contact system is used as a core element of the arc-extinguishing chamber, and the magnitude of the loop resistance value of the vacuum arc-extinguishing chamber is a key factor affecting the temperature rise performance.
Vacuum switches also have their inherent weaknesses, namely the problems of delayed heavy breakdown after arcing and operating overvoltage, and the problem of external insulation of the vacuum interrupter in harsh environments. In the vacuum gap, the contact surface is not only rugged in microstructure, but also there is inevitably some chip microblocks that are not firmly attached. The reason for the generation of micro-blocks is that particles and dust are attached to the surface during contact processing, and particularly fragments are attached to the surface of a contact after one or more times of breaking and more defects are generated. Even if the contact surface is ground very smooth and clean, the microscopic upper surface is still rugged, and there are many local protrusions, the electric field at these microscopic sharp protrusions will be locally enhanced, and the local enhancement factor β (maximum local electric field intensity/average electric field intensity) of the electric field can be as high as 10 to 100. Under the action of the voltage applied between the contacts, the electric field is concentrated at the cusps to emit electrons. Although the electron flow is very small, the sectional area of the cusp is very small, so the current density can reach 105-106A/mm < 2 >, and obvious local heating exists. This not only causes further enhancement of electron emission, but also the electrode may melt and evaporate due to local overheating of the surface, and the generated metal vapor atoms are dissociated by collision of high-speed electrons emitted from the electrode surface, and then a process similar to breakdown of the gas gap will occur. Particularly, in the process of switching capacitor banks, high overvoltage is generated due to the occurrence of inrush current and repeated reburning, and serious damage is brought to power equipment. The prior art discloses either direct test on the capacitor bank or back-to-back capacitor bank switching test on both capacitor banks, but the prior art requires higher cost, lower efficiency, and does not have any impact or improvement on the overall performance of the high voltage vacuum switch. How to improve the capability of switching capacitors of a vacuum switch is a technical problem to be solved.
Disclosure of Invention
In order to solve the technical problems, the invention provides the power frequency voltage withstand test device for opening and closing the contact of the high-voltage vacuum switch, which ensures the safe and reliable operation of the vacuum switch in a power system.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a contact opening and closing power frequency withstand voltage test device of a high-voltage vacuum switch comprises a power frequency high-voltage generation unit, a high-voltage detection unit and a test unit; the output end of the power frequency high-voltage generating unit is connected with the input end of the high-voltage detecting unit; the output end of the high-voltage detection unit is connected with the input end of the test unit;
the power frequency high voltage generation unit is used for inducing the power frequency high voltage from the alternating voltage through the voltage regulator and the transformer and raising the power frequency withstand voltage to the required voltage level; the times of the withstand voltage test are adjusted through a time relay;
the high-voltage detection unit is used for detecting a voltage effective value and a current effective value of corresponding voltage class of each voltage withstand test through the current transformer and the voltage transformer;
the test unit is used for storing electric energy during detection of the contact of the target high-voltage vacuum switch through the capacitive device and realizing power frequency withstand voltage detection of opening and closing of the contact of the target high-voltage vacuum switch.
Further, the power frequency high voltage generating unit comprises an alternating voltage output end, a voltage regulator and a transformer;
the alternating voltage output end is connected to the input end of the voltage regulator through a contactor; the output end of the voltage regulator is connected with the input end of the transformer; the output end of the transformer is connected with a high-voltage detection unit; the voltage regulator is used for inducing power frequency high voltage; the transformer is used for increasing the induced power frequency high-voltage withstand voltage to a required voltage level and inputting the voltage level to the high-voltage detection unit.
Further, a fuse is further arranged between the alternating-current voltage output end and the contactor and used for protecting the power frequency high-voltage generation unit from damage caused by short circuit and overcurrent.
Further, the power frequency high voltage generating unit further comprises a contactor; the coil of the contactor is connected with one end of a normally closed contact of the time relay; after the coil of the contactor is electrified, the normally open contact of the time relay is attracted; the normally open contact of the contactor is connected with the timing switch and the coil of the time relay.
Further, the normally open contact of the contactor is further connected with an operation indicator lamp, and when the normally open contact of the contactor is in suction, the operation indicator lamp is on, and the normal operation is displayed.
Further, the output end of the voltage regulator is also connected with an overcurrent protector; the normally open contact of the overcurrent protector is connected with the coil of the intermediate relay; the normally open contact of the intermediate relay is connected with the fault indicator lamp; when the voltage output by the output end of the voltage regulator is higher than the threshold value, the normally open contact of the intermediate relay is attracted, and the fault indicator lamp is on.
Furthermore, in the high-voltage detection unit loop, the current transformer and the voltage transformer are also connected in series with the resistive device and are used for limiting the current of the high-voltage loop.
Furthermore, the resistive device is also connected with the discharge protection ball gap and is used for protecting the target vacuum high-voltage switch during the power frequency high-voltage test.
Further, a current transformer secondary output port and a voltage transformer secondary output port are arranged on an operation panel of the contact opening and closing power frequency withstand voltage test device.
Furthermore, the capacitor in the test unit is connected in series with the output end of the transformer and the incoming line end of the target high-voltage vacuum switch, the capacitor stores electric energy meeting the voltage withstand test, and the outgoing line end of the target high-voltage vacuum switch is connected with the ground, so that a loop is formed between the switch of the target high-voltage vacuum switch and the ground when the switch of the target high-voltage vacuum switch is opened and closed, and the purpose of power frequency voltage withstand of switch contact opening and closing of the target high-voltage vacuum switch is achieved.
The effects provided in the summary of the invention are merely effects of embodiments, not all effects of the invention, and one of the above technical solutions has the following advantages or beneficial effects:
the invention provides a contact opening and closing power frequency withstand voltage test device of a high-voltage vacuum switch, which belongs to the technical field of withstand voltage detection of the high-voltage vacuum switch, and comprises a power frequency high-voltage generation unit, a high-voltage detection unit and a test unit; the output end of the power frequency high-voltage generating unit is connected with the input end of the high-voltage detecting unit; the output end of the high-voltage detection unit is connected with the input end of the test unit; the power frequency high voltage generation unit is used for inducing power frequency high voltage from alternating voltage through the voltage regulator and the transformer and raising the power frequency withstand voltage value to a required voltage level; the times of the withstand voltage test are adjusted through a time relay; the high-voltage detection unit is used for detecting the voltage effective value and the current effective value of the corresponding voltage class in each voltage withstand test through the current transformer and the voltage transformer; the test unit is used for storing electric energy during detection of the contact of the target high-voltage vacuum switch through the capacitive device, and realizing power frequency voltage withstand detection of opening and closing of the contact of the target high-voltage vacuum switch. After the contact opening and closing power frequency withstand voltage test device of the high-voltage vacuum switch is implemented, the vacuum switch contact can generate discharge arc when opening and closing power frequency withstand voltage, and the defects of burrs, impurities and the like on the surface of the contact are ablated by the discharge arc; the breaking capacity of the vacuum switch contact is greatly improved, and the probability of heavy-duty breakdown is obviously reduced.
According to the contact opening and closing power frequency withstand voltage test device for the high-voltage vacuum switch, after the high-voltage vacuum switch is subjected to power frequency withstand voltage for a plurality of times of contact opening and closing, the contact surface of the high-voltage vacuum switch is purified, so that the condition of the contact surface is improved, the tissue structure and components of the contact material surface can be improved due to secondary metallurgical effect generated by discharging, the effect of reinforcing the material characteristics is achieved, the contact resistance of a vacuum arc extinguishing chamber is effectively reduced, the insulation performance of a gap is improved, and the safe and reliable operation of the vacuum switch in a power system is ensured.
Drawings
Fig. 1 is a schematic connection diagram of a contact opening and closing power frequency withstand voltage test device of a high-voltage vacuum switch according to embodiment 1 of the present invention;
fig. 2 is a control schematic diagram of a contact opening and closing power frequency withstand voltage test device of a high-voltage vacuum switch according to embodiment 1 of the present invention;
fig. 3 is a schematic diagram of voltage mutual inductance in a contact opening and closing power frequency withstand voltage test device of a high-voltage vacuum switch according to embodiment 1 of the present invention;
fig. 4 is a schematic diagram of current mutual inductance in a contact opening and closing power frequency withstand voltage test device of a high-voltage vacuum switch according to embodiment 1 of the present invention;
fig. 5 is an operation panel layout diagram of a contact opening and closing power frequency withstand voltage test device for a high-voltage vacuum switch according to embodiment 1 of the present invention.
Detailed Description
In order to clearly illustrate the technical features of the present solution, the present invention will be described in detail below with reference to the following detailed description and the accompanying drawings. The following disclosure provides many different embodiments, or examples, for implementing different structures of the invention. In order to simplify the present disclosure, components and arrangements of specific examples are described below. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. It should be noted that the components illustrated in the figures are not necessarily drawn to scale. Descriptions of well-known components and processing techniques and processes are omitted so as to not unnecessarily obscure the present invention.
Example 1
The embodiment 1 of the invention provides a contact opening and closing power frequency withstand voltage test device of a high-voltage vacuum switch, which is used for solving the technical problem in the prior art that how to improve the capacity of switching a capacitor of the vacuum switch is needed to be solved.
Fig. 1 is a schematic connection diagram of a contact opening and closing power frequency withstand voltage test device of a high-voltage vacuum switch according to embodiment 1 of the present invention; the device comprises a power frequency high-voltage generating unit, a high-voltage detecting unit and a testing unit;
the output end of the power frequency high-voltage generating unit is connected with the input end of the high-voltage detecting unit; the output end of the high-voltage detection unit is connected with the input end of the test unit;
the power frequency high voltage generation unit is used for inducing power frequency high voltage from alternating voltage through the voltage regulator and the transformer and raising the power frequency withstand voltage value to a required voltage level; the times of the withstand voltage test are adjusted through a time relay;
the high-voltage detection unit is used for detecting the voltage effective value and the current effective value of the corresponding voltage class in each voltage withstand test through the current transformer and the voltage transformer;
the test unit is used for storing electric energy during detection of the contact of the target high-voltage vacuum switch through the capacitive device, and realizing power frequency voltage withstand detection of opening and closing of the contact of the target high-voltage vacuum switch.
The power frequency high voltage generating unit connects an AC220V power supply from a low voltage distribution box to a A, X inlet end of a contact voltage regulator TYQ through a control loop, and voltage regulator outlet ends a and x output AC 0-500V. Wherein L represents a power frequency alternating current 220V power supply live wire, and N represents a power frequency alternating current 220V power supply zero wire; and then the output end of the contact voltage regulator TYQ is connected to the low-voltage side of the high-voltage step-up transformer SYB, and the high-voltage step-up transformer senses and outputs AC 0-150 kV. The power frequency high voltage generating unit induces power frequency high voltage by using common alternating current power frequency voltage AC220V through a contact voltage regulator TYQ and a high voltage test transformer SYB, and raises a power frequency withstand voltage value to a required voltage level so as to meet the requirement of opening and closing the power frequency withstand voltage of the test between the vacuum switch contacts.
And a fuse RD is further arranged between the output end of the AC220V power supply led from the low-voltage distribution box in the power frequency high-voltage generation unit and the contactor and used for protecting the power frequency high-voltage generation unit from damage caused by short circuit and overcurrent. The fuse RD adopts an RT28N-32/1P fuse.
Fig. 3 is a schematic diagram of voltage mutual inductance in a contact opening and closing power frequency withstand voltage test device of a high-voltage vacuum switch according to embodiment 1 of the present invention; fig. 4 is a schematic diagram of current mutual inductance in a contact opening and closing power frequency withstand voltage test device of a high-voltage vacuum switch according to embodiment 1 of the present invention;
the high-voltage detection unit connects the high-voltage output ends of the 150kV water resistor R and the high-voltage step-up transformer SYB together, then connects the high-voltage current transformer TAa and the high-voltage transformer TVv in series and in parallel on a power frequency high-voltage output test line, and simultaneously leads respective secondary measurement loops v1, v2, c1 and c2 to a test operation table respectively. And finally, the discharge protection ball gaps G are connected in parallel on a test loop, namely, the two ends of the tested product, and the safety of the tested product and a test instrument is ensured by adjusting the gaps of the discharge protection ball gaps.
The capacitor C in the test unit is connected in series with the output end of the transformer and the incoming line end of the target high-voltage vacuum switch, the capacitor stores electric energy when the power frequency withstand voltage of opening and closing of the vacuum switch contacts is met, and the outgoing line end of the target high-voltage vacuum switch QF- (A, B, C) is directly connected with the ground GND, so that a loop is formed between the target high-voltage vacuum switch QF- (A, B, C) and the ground GND when the target high-voltage vacuum switch QF- (A, B, C) is opened and closed, and the power frequency withstand voltage purpose of opening and closing the target high-voltage vacuum switch QF contacts is achieved.
Fig. 2 is a control schematic diagram of a contact opening and closing power frequency withstand voltage test device of a high-voltage vacuum switch according to embodiment 1 of the present invention;
the power frequency high voltage generating unit also comprises a contactor KM; the coil of the contactor KM is connected with one end of a normally closed contact of the time relay KT; after the coil of the contactor KT is electrified, the normally open contact of the time relay KT is attracted; the normally open contact of the contactor KM is connected with the coils of the timing switch SB4 and the time relay KT. The contactor KM adopts CJX2 series alternating current contactor.
The normally open contact of the contactor KM is also connected with an operation instruction, and when the normally open contact of the contactor KM is attracted, the operation instruction HRD2 is bright, and the normal operation is displayed.
The output end of the voltage regulator TYQ is also connected with an overcurrent protector KA; the normally open contact of the overcurrent protector KA is connected with the coil of the intermediate relay K; the normally open contact of the intermediate relay K is connected with a fault indicator lamp HRD 3; when the voltage output by the output end of the voltage regulator TYQ is higher than a threshold value, the normally open contact of the intermediate relay K is attracted, and the fault indicator lamp HRD3 is on. The voltage regulator TYQ adopts TDGC2 series single-phase contact voltage regulators.
And the power indicator lamp HRD1 is connected between the zero line and the live line of the AC220V power supply of the low-voltage distribution box, and the power indicator lamp HRD1 displays normal when the power supply output is normal.
Fig. 5 is an operation panel layout diagram of a contact opening and closing power frequency withstand voltage test device for a high-voltage vacuum switch according to embodiment 1 of the present invention.
The operation panel of the contact opening and closing power frequency withstand voltage test device is provided with current transformer secondary output ports c1 and c2 and voltage transformer secondary output ports v1 and v2, wherein mA in figure 1 represents 85L1 alternating current milliampere meter; in fig. 1 KV represents 59L1 ac high voltage meter; in fig. 1, TA1 is a current transformer, and the current transformer is an LMZJ1 type current transformer.
And a voltage regulator TYQ, a time relay KT, an HRD1 power supply indication, an HRD2 running indication and an HRD3 fault indication are arranged on the operation panel.
Setting a vacuum switch on SB1, a vacuum switch on SB2 and a vacuum switch off SB3 on an operation panel; a timing switch SB4 and a vacuum switch opening SB5.
The ammeter adopts an 85L1 pointer type alternating current ammeter.
The separation and combination action interval is more than 30 s; the continuous operation is performed for more than 30 times. When the vacuum switch acts, the oscillograph is used for grabbing the waveform change condition at the moment of opening and closing.
The operation process of the contact opening and closing power frequency withstand voltage test device of the high-voltage vacuum switch provided by the embodiment 1 of the invention is as follows: firstly, checking whether all test loops are correctly and firmly wired, and whether all safety distances and protective measures meet standard requirements; then the moving contact ground wire of the vacuum switch can be removed, the test loop is switched on and boosted, whether the boosting process is normal or not is observed, whether the signals of all detection loops are correct or not and whether the gap of the discharge protection ball gap G is qualified or not is judged. After confirming that the voltage is not wrong, the voltage can be reduced to zero, after the ground discharge, the movable contact of the vacuum switch is connected with the ground wire, then the vacuum switch of the tested product is switched on, the voltage is gradually increased to the required power frequency withstand voltage value in the same steps, the power frequency withstand voltage test operation of opening and closing the vacuum switch contact is carried out, and the opening and closing action interval is 30 s-60 s; the continuous action is performed for more than 30 times, and the oscillograph is used for grabbing the waveform change condition at the moment of opening and closing.
After the contact opening and closing power frequency withstand voltage test device of the high-voltage vacuum switch provided by the embodiment 1 of the invention is implemented, the vacuum switch contact can generate discharge arc when opening and closing power frequency withstand voltage, and the defects of burrs, impurities and the like on the surface of the contact are ablated by the discharge arc; the breaking capacity of the vacuum switch contact is greatly improved, and the probability of heavy-duty breakdown is obviously reduced. Plays a certain role in the safe and reliable operation of the vacuum switch product; and further, the safe, reliable and stable operation of the power system is more powerfully ensured.
According to the contact opening and closing power frequency withstand voltage test device for the high-voltage vacuum switch, disclosed by the embodiment 1, after the high-voltage vacuum switch is subjected to power frequency withstand voltage for opening and closing of the contact for a plurality of times, the surface of the contact is purified, so that the condition of the surface of the contact is improved, the tissue structure and components of the surface of a contact material can be improved due to secondary metallurgical effect generated by discharge, and the effect of reinforcing the material characteristics is achieved. And further, the contact resistance of the vacuum arc-extinguishing chamber is effectively reduced, the insulation performance of the gap is improved, and the safe and reliable operation of the vacuum switch in the power system is ensured.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements is inherent to. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. In addition, the parts of the above technical solutions provided in the embodiments of the present application, which are consistent with the implementation principles of the corresponding technical solutions in the prior art, are not described in detail, so that redundant descriptions are avoided.
While the specific embodiments of the present invention have been described above with reference to the drawings, the scope of the present invention is not limited thereto. Other modifications and variations to the present invention will be apparent to those of skill in the art upon review of the foregoing description. It is not necessary here nor is it exhaustive of all embodiments. On the basis of the technical scheme of the invention, various modifications or variations which can be made by the person skilled in the art without the need of creative efforts are still within the protection scope of the invention.
Claims (10)
1. The contact opening and closing power frequency withstand voltage test device of the high-voltage vacuum switch is characterized by comprising a power frequency high-voltage generation unit, a high-voltage detection unit and a test unit; the output end of the power frequency high-voltage generating unit is connected with the input end of the high-voltage detecting unit; the output end of the high-voltage detection unit is connected with the input end of the test unit;
the power frequency high voltage generation unit is used for inducing the power frequency high voltage from the alternating voltage through the voltage regulator and the transformer and raising the power frequency withstand voltage to the required voltage level; the times of the withstand voltage test are adjusted through a time relay;
the high-voltage detection unit is used for detecting a voltage effective value and a current effective value of corresponding voltage class of each voltage withstand test through the current transformer and the voltage transformer;
the test unit is used for storing electric energy during detection of the contact of the target high-voltage vacuum switch through the capacitive device and realizing power frequency withstand voltage detection of opening and closing of the contact of the target high-voltage vacuum switch.
2. The contact opening and closing power frequency withstand voltage test device of the high-voltage vacuum switch according to claim 1, wherein the power frequency high-voltage generation unit comprises an alternating current voltage output end, a voltage regulator and a transformer;
the alternating voltage output end is connected to the input end of the voltage regulator through a contactor; the output end of the voltage regulator is connected with the input end of the transformer; the output end of the transformer is connected with a high-voltage detection unit; the voltage regulator is used for inducing power frequency high voltage; the transformer is used for increasing the induced power frequency high-voltage withstand voltage to a required voltage level and inputting the voltage level to the high-voltage detection unit.
3. The contact opening and closing power frequency withstand voltage test device of the high-voltage vacuum switch according to claim 2, wherein a fuse is further arranged between the alternating voltage output end and the contactor and used for protecting the power frequency high-voltage generation unit from damage caused by short circuit and overcurrent.
4. The contact opening and closing power frequency withstand voltage test device of the high-voltage vacuum switch according to claim 3, wherein the power frequency high-voltage generating unit further comprises a contactor; the coil of the contactor is connected with one end of a normally closed contact of the time relay; after the coil of the contactor is electrified, the normally open contact of the time relay is attracted; the normally open contact of the contactor is connected with the timing switch and the coil of the time relay.
5. The power frequency withstand voltage test device for opening and closing the contact of the high-voltage vacuum switch according to claim 4, wherein the normally open contact of the contactor is further connected with an operation indicator lamp, and the operation indicator lamp is lighted to display normal operation when the normally open contact of the contactor is attracted.
6. The contact opening and closing power frequency withstand voltage test device of the high-voltage vacuum switch according to claim 5, wherein the output end of the voltage regulator is also connected with an overcurrent protector; the normally open contact of the overcurrent protector is connected with the coil of the intermediate relay; the normally open contact of the intermediate relay is connected with the fault indicator lamp; when the voltage output by the output end of the voltage regulator is higher than the threshold value, the normally open contact of the intermediate relay is attracted, and the fault indicator lamp is on.
7. The contact opening and closing power frequency withstand voltage test device of the high-voltage vacuum switch according to claim 1, wherein in the high-voltage detection unit loop, a current transformer and a voltage transformer are further connected in series with a resistive device for limiting the current of the high-voltage loop.
8. The contact opening and closing power frequency withstand voltage test device of the high-voltage vacuum switch according to claim 7, wherein the resistive device is further connected with a discharge protection ball gap and is used for protecting the target vacuum high-voltage switch during power frequency high-voltage test.
9. The contact opening and closing power frequency withstand voltage test device of the high-voltage vacuum switch according to claim 7, wherein a current transformer secondary output port and a voltage transformer secondary output port are arranged on an operation panel of the contact opening and closing power frequency withstand voltage test device.
10. The power frequency voltage withstand test device for opening and closing the contact of the high-voltage vacuum switch according to claim 1, wherein the capacitor in the test unit is connected in series with the output end of the transformer and the incoming line end of the target high-voltage vacuum switch, the capacitor stores electric energy when meeting the voltage withstand test, and the outgoing line end of the target high-voltage vacuum switch is connected with the ground, so that a loop is formed between the opening and closing operation of the target high-voltage vacuum switch and the ground, and the purpose of opening and closing the power frequency voltage withstand of the contact of the target high-voltage vacuum switch is achieved.
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