CN217507218U - High-frequency large-current switching device for capacitor test and contactor used by same - Google Patents
High-frequency large-current switching device for capacitor test and contactor used by same Download PDFInfo
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- CN217507218U CN217507218U CN202221286943.1U CN202221286943U CN217507218U CN 217507218 U CN217507218 U CN 217507218U CN 202221286943 U CN202221286943 U CN 202221286943U CN 217507218 U CN217507218 U CN 217507218U
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Abstract
A high-frequency large current switching device for capacitor test and a contactor used by the same are provided, the contactor comprises: the moving contact and the static contact are opposite to each other by a conductive contact surface along the moving direction of the moving contact; the driving device drives the movable contact head to contact or separate from the fixed contact so as to make the conductive contact surface contact or separate; the method is characterized in that: and the conductive contact surface of the moving contact covers the copper woven belt. This ingenious copper braid over braid covers the conductive contact surface of moving contact, compares traditional contactor and is showing and has improved the reliability of high frequency heavy current joint and breaking through the condenser when experimental, contact failure and short circuit phenomenon significantly reduce.
Description
Technical Field
The utility model relates to a condenser is experimental with high frequency heavy current auto-change over device, especially involve the contact structure and the drive of switch-on, the disconnected electric current of contactor that its used, IPC classification can belong to H01H1/00
Background
The high-frequency ripple test and the high-frequency thermal stability test of the capacitor need to be conducted and cut off high-frequency heavy current with the frequency of 1K-100 KHz and 500-2000A, the current has the particularity, the contact of the traditional contactor often cannot reliably switch the current, and poor contact or short circuit is easy to occur.
With regard to terms and general knowledge, reference is made to the national standard GB/T2900.18-2008 "Electrical Low Voltage appliances for Electrical terminology" and "design Manual for Low Voltage appliances" (1 st edition of mechanical industry Press 1992), "Motor engineering Manual" and "mechanical engineering Manual" (1 st edition of mechanical industry Press 1978-1983 and 2 nd edition of 1997), unless otherwise stated in this specification.
Disclosure of Invention
The utility model aims to solve the technical problem that, a high frequency heavy current auto-change over device for condenser test and contactor that uses thereof are proposed, compare and use traditional product, have better switching reliability to the high frequency heavy current that passes through the condenser during experiment.
The utility model provides a technical scheme is: a high-frequency large current switching device for capacitor test and a contactor used by the same are provided, the contactor comprises:
the moving contact and the static contact are opposite to each other by a conductive contact surface along the moving direction of the moving contact;
the driving device drives the movable contact head to move towards or away from the fixed contact so that the conductive contact surface is contacted or separated;
the method is characterized in that:
the conductive contact surface of the moving contact covers the copper woven belt.
Theory and practicality show that this ingenious copper braid over braid cover the electrically conductive contact surface of moving contact, compare traditional contactor and show to have improved the high frequency heavy current joint and the disconnected reliability of breaking through the condenser when experimental, contact failure and short circuit phenomenon significantly reduce.
Typical designs of such contactors include:
-a gantry;
-a linear cylinder fixed to the frame;
-said moving contact comprises a fixed plate coupled to a piston rod of said linear cylinder;
the copper braided strap is bent into a U shape, and the copper braided strap fixing plate is sleeved from bottom to top;
the fixed contact is fixed on the rack below the U-shaped bottom surface of the copper braided belt.
It is further designed as follows:
the piston rod of the linear cylinder is connected with the copper woven belt fixing plate through a floating joint. The spherical surface of the ball screw in the floating joint is coupled with the inner wall of the spherical surface of the ball support seat in a friction mode to rotate and roll in a three-dimensional mode, and the moving contact can automatically fine-tune the contact posture to achieve the best leveling relative to the static contact according to the contact pressure of the moving contact and the static contact, so that poor contact of the contact is obviously improved;
the fixed contact is a copper plate parallel to the U-shaped bottom surface of the copper braided belt. The good conductivity of the large section of the conductive material can obviously increase the rated current of the test; one end of the copper plate forms a conductive connecting end to directly lead in input current;
-one arm of the U-shaped copper braid forms a conductive connection terminal for directly conducting an input current;
the copper braided strap is bent into a U shape, the fixing plate is sleeved from bottom to top and screwed on the fixing plate by penetrating through two arms of the U shape through screws or bolts, the structure is firm, and the assembly is facilitated.
Use a plurality of the utility model discloses a high frequency heavy current auto-change over device is used in the condenser test of contactor switches the reliability and is showing the improvement.
Drawings
Fig. 1 is a schematic view of a general assembly of a contactor used in a high-frequency large-current switching device for a capacitor test according to an embodiment of the present invention (when moving and static contacts are connected).
Fig. 2 is a schematic view of a general assembly of a contactor used in the high-frequency large-current switching device for capacitor tests according to the embodiment of the present invention (when moving and static contacts are disconnected).
Fig. 3 is an enlarged partial cross-sectional view at I (when the floating joint structure is centered).
Fig. 4 is an enlarged partial cross-sectional view at I (when the floating joint structure is tilted).
Fig. 5 is a schematic circuit diagram of the high-frequency high-current switching device for capacitor test according to the embodiment of the present invention.
The labels in the figure are:
1-a frame; 2-a cylinder; 3-cylinder ejector pin; 4-cylinder fixing plate; 5-a floating joint; 51-ball head screw; 52-ball head support seat; 6-guide pillar; 7-copper braided belt fixing plate; 8-copper braided straps; 81-copper braided strap terminals; 82-copper braided belt pressing plate; 83-screw; 9-static contact; 91-a stationary contact terminal; 10-a sensor; 11-a fixed contact fixing plate; a PL-PN-power terminal; l1, L2-inductor; KY1-KY 9-inductance adjusting contactor; KM 15-18-capacitance adjustment contactor; C7-C10-capacitor.
Detailed Description
The embodiment of the utility model provides a contactor's basic structure that experimental high frequency heavy current auto-change over device used of condenser is shown in 1-4, include:
-a frame 1;
-a linear cylinder 2 fixed to the frame 1;
the ball head screw 51 of the floating joint 5 is connected to the top end of the piston rod 3 of the linear cylinder 2 through a bolt, and the ball head supporting seat 52 is connected with the copper braided belt fixing plate 7 made of an insulating plate through a bolt. The outsourcing brand of the floating joint 5 is Adam pneumatic, and the model is F-M8X 125F;
the copper braided strap 8 is bent into a U shape, the fixing plate 7 is sleeved from bottom to top, a screw 83 penetrates through two U-shaped arms of the copper braided strap 8 through a copper braided strap pressing plate 82 which is electroplated by steel, and the copper braided strap is screwed on the copper braided strap fixing plate 7; the structure forms a movable contact of the contactor of the embodiment, which is controlled and driven by the linear cylinder 2. One arm of the U-shaped copper braided belt (8) forms a copper braided belt terminal 81 which is used as one pole of input current of the movable contact. The copper braided belt 8 adopts an electrical copper twill braided wire TZ-15/120mm specified by national industry standard JB/T6313 2 。
The static contact 9 is made of a brass plate, and is parallel to the lower part of the U-shaped bottom surface of the copper braided belt 8 and is fixed above a static contact fixing plate 11 made of an insulating plate. The fixed contact fixing plate 11 is fixed on the frame 1. One end of the brass plate of the static contact 9 is formed into a static contact wiring terminal 91;
the wiring end 81 of the copper braided strap (8) and the wiring end 91 of the brass plate of the static contact 9 are respectively wrapped and clamped with external wires and connected to test equipment;
the side surface of the linear cylinder 2 is provided with a position sensor 10 which is connected to control equipment to control the opening and closing of an electromagnetic valve for supplying air to the cylinder and limit the displacement of a cylinder ejector rod.
The embodiment of the utility model provides a contactor that experimental high frequency heavy current auto-change over device used of condenser can have as following design improvement:
the moving contact can be driven by hydraulic pressure, an electromagnet or a motor, but experiments show that the contact or separation of the conductive contact surface is most reliable and the cost is centered by matching pneumatic with the copper woven belt;
the floating joint 5 can be manufactured according to the existing product principle, and mainly the spherical surface of the ball screw in the floating joint needs to be most appropriately frictionally coupled with the inner wall of the spherical surface of the ball head supporting seat to rotate and roll in a three-dimensional way, so that the movable contact can be better automatically and finely adjusted in contact posture according to the contact pressure with the fixed contact to achieve the best leveling relative to the fixed contact; when the rated current is small, the piston rod of the linear cylinder can be directly connected with the copper woven belt fixing plate without passing through the floating joint.
The copper braided belt 8 can adopt other types and specifications of electrical copper twill braided wires specified by the national industry standard JB/T6313 according to the rated current of equipment, and is mainly characterized in that a larger section specification is adopted when the rated current is large, and the diameter of a single wire is larger;
the static contact 9 can also be made of a copper plate, so that the conductivity is better, but the durability is slightly poor;
the copper braided strap 8 is bent into a U shape to cover the fixing plate (7) from bottom to top, and can be fixed by a hoop instead;
the U-shaped arm of the copper braided strap 8 can be properly extended to form the copper braided strap terminal.
The embodiment of the utility model provides a circuit principle of experimental high frequency heavy current auto-change over device of using of condenser is shown in figure 5. The device mainly comprises inductors L1 and L2, capacitors C1, C2, C3 and C4 which adjust and compensate power factors according to the capacity of a tested capacitor, and a plurality of contactors KY1, KY2, KY3 … … KY8, KM15, KM16, KM17 and KM18 which are used by the high-frequency high-current switching device for the capacitor test. The working principle and the using steps of the switching device are as follows:
firstly, connecting the test sample and the capacitor as shown in FIG. 5
Firstly, a test sample capacitor is connected in parallel with power supply terminals PL and PN;
secondly, an input power supply is connected in parallel at the two ends of the PL and the PN;
the inductor for adjusting and compensating power factor is also connected in parallel at the two ends of PL and PN;
adjusting inductance to match the capacitance of the test sample as much as possible (power factor is close to 1, input current of power supply is minimum), and the combination relation of the inductance achieved by each switch state is as follows:
first, KY1(ON) and KY4(ON) had a series inductance of 40569.6uH (corresponding to a rated test capacitance of 250uF/50HZ and a withstand voltage of 300 v).
KY1(ON), KY3(ON) and KY4(ON), the parallel inductance is 20284.8uH (corresponding to a rated test capacitance of 500uF/50HZ and a withstand voltage of 150 v).
③ KY6(ON) and KY8(ON), the series inductance is 40569.6uH (corresponding to the rated test capacitance of 250uF/50HZ, withstand voltage of 300v)
KY6(ON), KY7(ON) and KY9(ON) are connected with an inductor 20284.8uH (corresponding to the rated test capacitance of 500uF/50HZ and the withstand voltage of 150v) in parallel.
In addition to the combination of the above-four, the following combinations can be combined:
KY5(ON) is selected, and inductance 40569.6uH (corresponding to 250uF of rated test capacitance and 300v of withstand voltage) is selected;
no. KY5(ON) is selected, and No. 81139.19uH (corresponding to 125uF of rated test capacitance and 600v of withstand voltage) is selected.
When the capacitance of the test sample is smaller than the rated test capacitance, the corresponding capacitor is accessed to achieve the function of matching the capacitance reduction value of the test sample under each switch state:
KM15(ON) is-10 uF;
KM16(ON) is-20 uF;
KM17(ON) is-30 uF;
KM18(ON) was-40 uF.
The differences (ON) of KM15-KM18 can be combined to give the following values of capacity reduction for the test samples:
-10uF、-20uF、-30uF、-40uF、-50uF、-60uF、-70uF、-80uF、-90uF、-100uF。
for example: when the tested sample is 230uF (300v), the inductance is selected to be the combination of No. I and the capacitance reduction value is selected to be KM16 (ON).
Claims (7)
1. A contactor for a high-frequency large-current switching device for a capacitor test comprises: the moving contact and the static contact are opposite to each other by a conductive contact surface along the moving direction of the moving contact; the driving device drives the movable contact head to contact or leave the fixed contact so that the conductive contact surface is contacted or separated; the method is characterized in that: and the conductive contact surface of the moving contact covers the copper woven belt.
2. A contactor for a high frequency high current switching device for capacitor test according to claim 1, comprising:
-a frame (1);
-a linear cylinder (2) fixed to the frame (1);
-the moving contact comprises a copper braid over braid fixing plate (7) coupled to the piston rod (3) of the linear cylinder (2);
the copper braided strap (8) is bent into a U shape, and the copper braided strap fixing plate (7) is sleeved from bottom to top;
the fixed contact is fixed on the rack (1) below the U-shaped bottom surface of the copper braided belt (8).
3. A contactor for a high frequency high current switching device for capacitor test according to claim 2, wherein: the piston rod of the linear cylinder (2) is connected with a copper woven belt fixing plate (7) through a floating joint (5).
4. A contactor for a high frequency large current switching device for capacitor test according to claim 2, wherein: the fixed contact is a copper plate (9) parallel to the U-shaped bottom surface of the copper braided belt (8).
5. A contactor for a high frequency high current switching device for capacitor test according to claim 2, wherein: one arm of the U-shaped copper braided belt (8) forms a conductive connection end so as to directly lead in input current.
6. A contactor for a high frequency high current switching device for capacitor test according to claim 2, wherein: the copper braided strap (8) is bent into a U shape and is sleeved on the copper braided strap fixing plate (7) from bottom to top, and the U-shaped two arms are penetrated through by screws or bolts and are screwed on the copper braided strap fixing plate (7).
7. A high frequency high current switching device for capacitor test, which electrically connects a plurality of contactors as claimed in any 1 of claims 1-6, further comprising an inductor for compensating a power factor and a capacitor for matching a capacitance smaller than a rated test capacitance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221286943.1U CN217507218U (en) | 2022-05-25 | 2022-05-25 | High-frequency large-current switching device for capacitor test and contactor used by same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221286943.1U CN217507218U (en) | 2022-05-25 | 2022-05-25 | High-frequency large-current switching device for capacitor test and contactor used by same |
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| Publication Number | Publication Date |
|---|---|
| CN217507218U true CN217507218U (en) | 2022-09-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221286943.1U Active CN217507218U (en) | 2022-05-25 | 2022-05-25 | High-frequency large-current switching device for capacitor test and contactor used by same |
Country Status (1)
| Country | Link |
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| CN (1) | CN217507218U (en) |
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2022
- 2022-05-25 CN CN202221286943.1U patent/CN217507218U/en active Active
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