Series resonant high-voltage measuring device
By adjusting the inductance value of the adjustable inductor using a series resonant high-voltage measuring device, the problems of voltage divider affecting voltage stability and transportation and setup costs are solved, thus achieving efficient and stable AC high-voltage measurement.
Patent Information
- Application Number
- CN202520238718.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-14
- Publication Date
- 2025-12-30
- Estimated Expiration
- 2035-02-14
AI Technical Summary
Existing technologies rely on voltage dividers when measuring high AC voltages. This leads to dielectric losses and leakage current in the capacitor voltage divider, affecting the stability of the output voltage. Furthermore, the transportation and installation of compensation capacitors or inductors are costly and time-consuming, hindering the normal conduct of experiments.
A series resonant high-voltage measuring device is adopted. By synchronously adjusting the distance between the first and second moving iron cores and the stationary iron core, the inductance value of the adjustable inductor is changed. The voltage is calculated by measuring the current in the circuit using an ammeter, thus avoiding the use of a voltage divider.
It enables stable measurement of high AC voltage without relying on a voltage divider, simplifying equipment transportation and setup, and reducing costs and time consumption.
Smart Images
Figure CN223742600U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to power measurement technical field especially relates to a series resonance type high voltage measuring device. BACKGROUND
[0002] The current method for measuring alternating high voltage includes high voltage electrostatic voltmeter measurement, sphere gap measurement, various voltage divider, voltage transformer measurement, low voltage side measurement of test transformer. They all need to use voltage divider, and the output voltage stability of the capacitive voltage divider is slightly poor due to the influence of factors such as dielectric loss and leakage of the capacitor, and the voltage fluctuation will affect the circuit performance. When using the voltage divider to measure high voltage in the actual resonance test, compensation capacitor or compensation inductor needs to be added to achieve resonance state, and in high voltage experiment, the size of the electric reactor and capacitor used for compensation is relatively large, and it is relatively troublesome to transport and build compensation electric reactor or capacitor. This leads to a problem that transporting and building compensation electric reactor or capacitor will consume more cost and time, affecting the normal progress of the experiment. SUMMARY
[0003] The utility model aims at providing a series resonance type high voltage measuring device, which solves the problem that measuring alternating high voltage is limited to voltage divider.
[0004] To achieve the above purpose, the utility model adopts the technical scheme that:
[0005] The utility model provides a series resonance type high voltage measuring device, which comprises a test power supply, an excitation transformer, a power frequency inductance adjusting module, a test product and a voltmeter,
[0006] The output end of the test power supply is electrically connected with the input end of the excitation transformer, the output end of the excitation transformer is connected with the power frequency inductance adjusting module and the test product in series, and the output end of the excitation transformer is also grounded.
[0007] The power frequency inductance adjusting module comprises a first adjustable inductor and a second adjustable inductor, the first adjustable inductor comprises a first moving iron core and a first static iron core, the distance between the first moving iron core and the first static iron core can be adjusted, the second adjustable inductor comprises a second moving iron core and a second static iron core, and the distance between the second moving iron core and the second static iron core can be adjusted.
[0008] The voltmeter is used for testing the current in the series circuit of the output end of the excitation transformer.
[0009] Optionally, a three-phase power supply is arranged in electrical connection with the test power supply, and a power supply isolation transformer is arranged in electrical connection between the test power supply and the three-phase power supply.
[0010] Optionally, the first adjustable inductor comprises a first fixed side yoke, a first telescopic end yoke and a first tension rod, the first telescopic end yoke is rotatably arranged on the first fixed side yoke, the first tension rod is threadedly connected with the first telescopic end yoke, and the first moving iron core is arranged on the first tension rod.
[0011] Further, the second adjustable inductor comprises a second fixed side yoke, a second telescopic end yoke and a second tension rod, the second telescopic end yoke is rotatably arranged on the second fixed side yoke, the second tension rod is threadedly connected with the second telescopic end yoke, and the second moving iron core is arranged on the second tension rod.
[0012] Further, the power frequency adjustable inductor module further comprises a shaft coupling, and two ends of the shaft coupling are respectively connected with the first telescopic end yoke and the second telescopic end yoke.
[0013] Further, the first fixed side yoke, the first telescopic end yoke and the first tension rod are arranged in pairs, the second fixed side yoke, the second telescopic end yoke and the second tension rod are arranged in pairs, the shaft coupling is also arranged in pairs, two pairs of the first telescopic end yokes and two pairs of the second telescopic end yokes are connected through the shaft coupling, two ends of the first tension rod are respectively connected with two first telescopic end yokes, and two ends of the second tension rod are respectively connected with two second telescopic end yokes.
[0014] Further, the power frequency adjustable inductor module further comprises a first motor and a second motor, the first motor and the second motor are arranged at two ends of the bottom of the second adjustable inductor, and drive shafts of the first motor and the second motor are respectively connected with two first telescopic end yokes.
[0015] Further, the power frequency adjustable inductor module further comprises a first gear, a second gear, a first switch, a second switch and a rack, the first gear is arranged on the drive shaft of the first motor, the second gear is arranged on the drive shaft of the second motor, the rack is arranged in meshing with the first gear and the second gear respectively, and the first switch and the second switch are arranged at two ends of a moving path of the rack.
[0016] Optionally, the first adjustable inductor further comprises a first device cylinder, a first pointer and a first scale, the first pointer is arranged on the first tension rod, the first scale is arranged on a wall of the first device cylinder, and the first pointer is aligned with the scale on the first scale.
[0017] Optionally, the second adjustable inductor further comprises a second device cylinder, a second pointer and a second scale, the second pointer is arranged on the second tension rod, the second scale is arranged on a wall of the second device cylinder, and the second pointer is aligned with the scale on the second scale.
[0018] Due to the above technical scheme, the utility model has the following advantages compared with the prior art:
[0019] The series resonant high voltage measuring device has the advantages that the first movable iron core and the second movable iron core are synchronously adjusted, the distance between the first movable iron core and the first static iron core changes, the distance between the second movable iron core and the second static iron core also changes, the inductance of the first adjustable inductor and the second adjustable inductor changes, the inductance value changes of the two places are indicated by the first scale and the second scale respectively, further, the current of the series circuit changes, the voltage of the series circuit is calculated by the formula U=2π*f*L*I, and a voltage divider is not needed in the process, and therefore the problem that the measurement of the alternating high voltage is limited to the voltage divider is solved. BRIEF DESCRIPTION OF DRAWINGS
[0020] Some specific embodiments of the utility model will be described in detail below with reference to the accompanying drawings in an exemplary but not restrictive manner. The same reference signs in the drawings indicate the same or similar components or parts. Those skilled in the art should understand that the drawings are not necessarily drawn to scale. In the drawings:
[0021] Figure 1 is a circuit diagram of a series resonant high voltage measuring device according to the utility preferred embodiment;
[0022] Figure 2 is Figure 1 is an internal structure diagram of the power frequency inductance adjusting module shown in the figure;
[0023] Figure 3 is Figure 2 is a connection relationship diagram of the rack, the first gear and the second gear shown in the figure;
[0024] Figure 4 is Figure 2 is a connection diagram of the shaft coupling, the first telescopic end yoke and the second telescopic end yoke shown in the figure.
[0025] In the drawings, the reference signs are explained as follows:
[0026] 1, test power supply; 2, excitation transformer; 3, power frequency inductance adjusting module; 4, test product; 5, ammeter; 6, three-phase power supply; 7, power supply isolation transformer; 8, insulating base; 30, shaft coupling; 31, first adjustable inductor; 32, second adjustable inductor; 33, first motor; 34, second motor; 35, first gear; 36, second gear; 37, first switch; 38, second switch; 39, rack; 311, first moving iron core; 312, first stationary iron core; 313, first fixed side yoke; 314, first telescopic end yoke; 315, first tension rod; 316, first device cylinder; 317, first pointer; 318, first scale; 321, second moving iron core; 322, second stationary iron core; 323, second fixed side yoke; 324, second telescopic end yoke; 325, second tension rod; 326, second device cylinder; 327, second pointer; 328, second scale. DETAILED DESCRIPTION
[0027] The technical solutions of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.
[0028] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.
[0029] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as there is no conflict between them.
[0030] For example, Figure 1 For example, Figure 2 For example, Figure 3As shown, a series resonant high voltage measuring device includes a test power supply 1, an excitation transformer 2, a power frequency inductance adjusting module 3, a test object 4 and a voltmeter 5. The output end of the test power supply 1 is electrically connected to the input end of the excitation transformer 2, and the test power supply 1 provides a test voltage to the excitation transformer 2. The output end of the excitation transformer 2 is in series with the power frequency inductance adjusting module 3 and the test object 4, and the output end of the excitation transformer 2 is also grounded. The high voltage side of the excitation transformer 2 is grounded. The circuit realizes a series resonant circuit. The excitation transformer 2 raises the voltage value output by the test power supply 1 to a target voltage value required for testing. The output end of the excitation transformer 2 is high voltage, and the test object 4 is a capacitive load.
[0031] The power frequency inductance adjusting module 3 includes a first adjustable inductor 31 and a second adjustable inductor 32. The second adjustable inductor 32 is located above the first adjustable inductor 31. The first adjustable inductor 31 includes a first moving iron core 311 and a first stationary iron core 312. Coils are respectively sleeved on the outer periphery of the first moving iron core 311 and the first stationary iron core 312. Both of the coils can conduct electricity. The distance between the first moving iron core 311 and the first stationary iron core 312 can be adjusted. When the distance between the first moving iron core 311 and the first stationary iron core 312 changes, the inductance in the first adjustable inductor 31 changes.
[0032] The first adjustable inductor 31 and the second adjustable inductor 32 are respectively provided with insulating bases 8 at the bottom. The two insulating bases 8 respectively support the first adjustable inductor 31 and the second adjustable inductor 32. The insulating bases 8 have an insulating effect.
[0033] The second adjustable inductor 32 includes a second moving iron core 321 and a second stationary iron core 322. The distance between the second moving iron core 321 and the second stationary iron core 322 can be adjusted. Coils are respectively sleeved on the outer periphery of the second moving iron core 321 and the second stationary iron core 322. Both of the coils can conduct electricity. When the distance between the second moving iron core 321 and the second stationary iron core 322 changes, the inductance in the second adjustable inductor 32 changes.
[0034] When the inductance in the first adjustable inductor 31 and the second adjustable inductor 32 changes, the voltage in the series resonant circuit changes. The ammeter 5 is used to test the current in the series circuit at the output end of the excitation transformer 2. In this example, the ammeter 5 is arranged on the circuit between the high voltage side of the excitation transformer 2 and the test object 4. The ammeter 5 detects the high voltage current in the circuit in real time. The ammeter 5 adopts a current clamp meter.
[0035] A three-phase power supply 6 is electrically connected to the test power supply 1. A power isolation transformer 7 is electrically connected between the test power supply 1 and the three-phase power supply 6. The three-phase power supply 6 supplies power to the test power supply 1. The power isolation transformer 7 is located in the circuit between the three-phase power supply 6 and the test power supply 1. The power isolation transformer 7 has an insulating effect, protects personal safety and isolates dangerous voltage.
[0036] The first adjustable inductor 31 comprises a first fixed side yoke 313, a first telescopic end yoke 314 and a first tension rod 315. The first telescopic end yoke 314 is rotatably arranged on the first fixed side yoke 313, and the first tension rod 315 is threadedly connected with the first telescopic end yoke 314. The first movable iron core 311 is arranged on the first tension rod 315. When the first telescopic end yoke 314 is rotated, the first telescopic end yoke 314 can be raised or lowered, so that the first movable iron core 311 can also be raised or lowered, and then the distance between the first movable iron core 311 and the first fixed side yoke 312 changes, and the inductance in the first adjustable inductor 31 changes correspondingly.
[0037] The first adjustable inductor 31 further comprises a first device cylinder 316, a first pointer 317 and a first scale 318. The first fixed side yoke 313, the first telescopic end yoke 314 and the first tension rod 315 are all arranged in the first device cylinder 316. The first pointer 317 is arranged on the first tension rod 315, and the first scale 318 is arranged on the wall of the first device cylinder 316. The first pointer 317 is aligned with the scale on the first scale 318. When the first tension rod 315 moves, the first pointer 317 points to different scales on the first scale 318. The first scale 318 belongs to an inductance scale. The movement of the first movable iron core 311 causes the inductance to change. By pointing to different scales by the first pointer 317, the change of the inductance is displayed on the first scale 318, and the change value of the inductance is directly read on the first scale 318.
[0038] The second adjustable inductor 32 comprises a second fixed side yoke 323, a second telescopic end yoke 324 and a second tension rod 325. The second telescopic end yoke 324 is rotatably arranged on the second fixed side yoke 323, and the second tension rod 325 is threadedly connected with the second telescopic end yoke 324. The second movable iron core 321 is arranged on the second tension rod 325. When the second telescopic end yoke 324 is rotated, the second tension rod 325 can be raised or lowered, so that the distance between the second movable iron core 321 and the second fixed side yoke 322 changes, and the inductance in the second adjustable inductor 32 changes correspondingly.
[0039] The second adjustable inductor 32 further comprises a second device cylinder 326, a second pointer 327 and a second scale 328, the second fixed side yoke 323, the second telescopic end yoke 324 and the second tension rod 325 are arranged in the second device cylinder 326, the second pointer 327 is arranged on the second tension rod 325, the second scale 328 is arranged on the wall of the second device cylinder 326, the second pointer 327 is aligned with the scale on the second scale 328, when the second tension rod 325 moves, the second pointer 327 points to different scales on the second scale 328, the second scale 328 is an inductance scale, the movement of the second moving iron core 321 causes the inductance to change, and the change of the inductance is displayed on the second scale 328 through the different scales pointed by the second pointer 327, and the change value of the inductance is directly read on the second scale 328.
[0040] The ammeter 5 tests the current value in the circuit, the first scale 318 and the second scale 328 display the change value of the inductance respectively, and the change value of the inductance is read out through the first pointer 317 and the second pointer 327 respectively, that is, the high voltage in the circuit can be calculated according to the formula U=2π*f*L*I, L is the sum of the inductance of the first scale 318 and the second scale 328, and in the formula, U represents voltage, in an alternating current circuit, voltage represents the induced electromotive force or voltage drop across the inductance element, π is a mathematical constant, approximately equal to 3.14159, f represents the frequency of the circuit, that is, the number of periodic changes per second, in this example, the fixed frequency is 50 Hz, L represents inductance, which reflects the resistance of the inductance element to current change, and I represents current, which is the current value measured by the ammeter 5.
[0041] The first fixed side yoke 313, the first telescopic end yoke 314 and the first tension rod 315 are respectively arranged in pairs and symmetrically arranged in the first device cylinder 316, the second fixed side yoke 323, the second telescopic end yoke 324 and the second tension rod 325 are respectively arranged in pairs and symmetrically arranged in the second device cylinder 326, the shaft coupling 30 is also arranged in pairs, the two pairs of first telescopic end yokes 314 and the two pairs of second telescopic end yokes 324 are connected through the shaft coupling 30, the two ends of the first tension rod 315 are respectively connected to the two first telescopic end yokes 314, the first moving iron core 311 is arranged in the middle of the first tension rod 315, and the two ends of the second tension rod 325 are respectively connected to the two second telescopic end yokes 324, and the second moving iron core 321 is arranged in the middle of the second tension rod 325.
[0042] The power frequency inductance adjusting module 3 further comprises a first motor 33 and a second motor 34, the first motor 33 and the second motor 34 are arranged at two ends of the bottom of the first adjustable inductor 31, drive shafts of the first motor 33 and the second motor 34 are respectively connected with two first telescopic end yokes 314, the two first telescopic end yokes 314 are symmetrically arranged and rotate in the same direction.
[0043] The power frequency inductance adjusting module 3 further comprises a first gear 35, a second gear 36, a first switch 37, a second switch 38 and a rack 39, the first gear 35 is arranged on the drive shaft of the first motor 33, the second gear 36 is arranged on the drive shaft of the second motor 34, the rack 39 is arranged in mesh with the first gear 35 and the second gear 36 respectively, the first switch 37 and the second switch 38 are arranged at two ends of a moving path of the rack 39 respectively, the drive shafts of the first motor 33 and the second motor 34 rotate at the same speed and in the same direction, the first switch 37 is signal connected with the first motor 33 and the second motor 34 respectively, and the second switch 38 is signal connected with the first motor 33 and the second motor 34 respectively.
[0044] The rack 39 is located between the first switch 37 and the second switch 38, when the first motor 33 and the second motor 34 are turned on, the first gear 35 and the second gear 36 rotate in the same direction and at the same speed, if the rack 39 touches the first switch 37, the first motor 33 and the second motor 34 stop driving, if the rack 39 touches the second switch 38, the first motor 33 and the second motor 34 stop driving again.
[0045] In this way, the first telescopic end yoke 314 and the second telescopic end yoke 324 will have positive rotation and reverse rotation, corresponding first tension rods 315 and second tension rods 325 will rise to a highest position and drop to a lowest position, the first movable iron core 311 and the first static iron core 312 have the farthest distance and the closest distance, that is, the moving distance of the first movable iron core 311 is limited, so the inductance change between the first movable iron core 311 and the first static iron core 312 is also within a range, the second movable iron core 321 and the second static iron core 322 have the farthest distance and the closest distance, the moving distance of the second movable iron core 321 is limited, so the inductance change between the second movable iron core 321 and the second static iron core 322 is also within a range.
[0046] As shown in Figure 4 The power frequency inductance adjusting module 3 further comprises a shaft coupling 30, the shaft coupling 30 is respectively connected with the first telescopic end yoke 314 and the second telescopic end yoke 324 at two ends, so that the first telescopic end yoke 314 and the second telescopic end yoke 324 can rotate synchronously, the first movable iron core 311 and the second movable iron core 321 move simultaneously, the inductance in the first adjustable inductor 31 and the second adjustable inductor 32 changes simultaneously, the shaft coupling 30 is connected with the first telescopic end yoke 314 and the second telescopic end yoke 324 through concave-convex structures, and relative rotation can be prevented.
[0047] The above embodiments are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and to implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application shall be covered within the protection scope of the present application.
Claims
1. A series resonant high voltage measuring device, comprising a test power supply (1), an excitation transformer (2), a power frequency inductance adjusting module (3), a test object (4) and an ammeter (5), characterized in that, the output end of the test power supply (1) is electrically connected to the input end of the excitation transformer (2), the output end of the excitation transformer (2) is in series with the power frequency inductance adjusting module (3) and the test object (4), and the output end of the excitation transformer (2) is also grounded; the power frequency inductance adjusting module (3) comprises a first adjustable inductor (31) and a second adjustable inductor (32), the first adjustable inductor (31) comprises a first moving iron core (311) and a first static iron core (312), the distance between the first moving iron core (311) and the first static iron core (312) is adjustable, and the second adjustable inductor (32) comprises a second moving iron core (321) and a second static iron core (322), the distance between the second moving iron core (321) and the second static iron core (322) is adjustable; the first adjustable inductor (31) further comprises a first device cylinder (316), a first pointer (317) and a first scale (318), the first pointer (317) is arranged on the first tensioning rod (315), the first scale (318) is arranged on the wall of the first device cylinder (316), and the first pointer (317) is aligned with the scale on the first scale (318); the second adjustable inductor (32) further comprises a second device cylinder (326), a second pointer (327) and a second scale (328), the second pointer (327) is arranged on the second tensioning rod (325), and the second scale (328) is arranged on the wall of the second device cylinder (326), and the second pointer (327) is aligned with the scale on the second scale (328); the ammeter (5) is used for testing the current in the series circuit at the output end of the excitation transformer (2).
2. The series resonant high voltage measurement device of claim 1, wherein, a three-phase power supply (6) is electrically connected to the test power supply (1), and a power isolation transformer (7) is electrically connected between the test power supply (1) and the three-phase power supply (6).
3. The series resonant high voltage measurement device of claim 1, wherein, the first adjustable inductor (31) comprises a first fixed side yoke (313), a first telescopic end yoke (314) and a first tensioning rod (315), the first telescopic end yoke (314) is rotatably arranged on the first fixed side yoke (313), the first tensioning rod (315) is threadedly connected with the first telescopic end yoke (314), and the first moving iron core (311) is arranged on the first tensioning rod (315).
4. The series resonant high voltage measurement device of claim 3, wherein, the second adjustable inductor (32) comprises a second fixed side yoke (323), a second telescopic end yoke (324) and a second tensioning rod (325), the second telescopic end yoke (324) is rotatably arranged on the second fixed side yoke (323), the second tensioning rod (325) is threadedly connected with the second telescopic end yoke (324), and the second moving iron core (321) is arranged on the second tensioning rod (325).
5. The series resonant high voltage measurement device of claim 4, wherein, The power frequency adjustable inductance module (3) further comprises a shaft coupling (30), and two ends of the shaft coupling (30) are connected with the first telescopic end yoke (314) and the second telescopic end yoke (324) respectively.
6. The series resonant high voltage measurement device of claim 5, wherein, The first fixed side yoke (313), the first telescopic end yoke (314) and the first tension rod (315) are provided in pairs respectively, the second fixed side yoke (323), the second telescopic end yoke (324) and the second tension rod (325) are provided in pairs respectively, the shaft coupling (30) is also provided in pairs, two pairs of the first telescopic end yoke (314) and two pairs of the second telescopic end yoke (324) are connected through the shaft coupling (30) respectively, two ends of the first tension rod (315) are connected with two first telescopic end yokes (314) respectively, and two ends of the second tension rod (325) are connected with two second telescopic end yokes (324) respectively.
7. The series resonant high voltage measurement device of claim 6, wherein, The power frequency adjustable inductance module (3) further comprises a first motor (33) and a second motor (34), the first motor (33) and the second motor (34) are arranged at two ends of the bottom of the first adjustable inductance (31), and drive shafts of the first motor (33) and the second motor (34) are connected with two first telescopic end yokes (314) respectively.
8. The series resonant high voltage measurement device of claim 7, wherein, The power frequency adjustable inductance module (3) further comprises a first gear (35), a second gear (36), a first switch (37), a second switch (38) and a rack (39), the first gear (35) is arranged on the drive shaft of the first motor (33), the second gear (36) is arranged on the drive shaft of the second motor (34), the rack (39) is arranged in meshing with the first gear (35) and the second gear (36) respectively, and the first switch (37) and the second switch (38) are arranged at two ends of the moving path of the rack (39) respectively.