CN210835073U - Novel ultralow frequency withstand voltage dielectric loss tester - Google Patents
Novel ultralow frequency withstand voltage dielectric loss tester Download PDFInfo
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- CN210835073U CN210835073U CN201920921759.1U CN201920921759U CN210835073U CN 210835073 U CN210835073 U CN 210835073U CN 201920921759 U CN201920921759 U CN 201920921759U CN 210835073 U CN210835073 U CN 210835073U
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Abstract
The utility model relates to a novel ultralow frequency withstand voltage dielectric loss tester, which comprises an ultralow frequency alternating current voltage source, a step-up transformer, an anti-electromagnetic interference filter circuit and a penicillin bridge; and two ends of the primary coil of the boosting transformer are connected to the output end of the ultralow-frequency alternating-current voltage source, and two ends of the secondary coil of the boosting transformer are connected to two input ends of the penicillin bridge through the anti-electromagnetic interference filter circuit. The utility model relates to a novel withstand voltage meson of ultralow frequency decreases tester adopts anti-electromagnetic interference filter circuit to record between step up transformer and xiLin electric bridge, can the inside step up transformer's of filtering electromagnetic interference to improve measurement accuracy.
Description
Technical Field
The utility model relates to a dielectric loss tester, concretely relates to novel withstand voltage of ultralow frequency is situated between and is decreased tester.
Background
The dielectric loss tester is used for measuring the dielectric loss (tg delta) and the capacitor capacity (Cx) of high-voltage equipment such as various insulating materials, insulating sleeves, power cables, capacitors, transformers and the like under power frequency high voltage, and eliminates QS high-voltage bridges. Since the internal booster is a strong magnetic field interference source, the result of the dielectric loss measurement is affected by the magnetic field interference and is inaccurate.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a novel withstand voltage of ultralow frequency is situated between and is decreased tester is provided, electromagnetic interference can be resisted, measurement accuracy is improved.
The utility model provides an above-mentioned technical problem's technical scheme as follows: a novel ultralow frequency voltage-resistant dielectric loss tester comprises an ultralow frequency alternating current voltage source, a step-up transformer, an anti-electromagnetic interference filter circuit and a penicillin bridge; and two ends of the primary coil of the boosting transformer are connected to the output end of the ultralow-frequency alternating-current voltage source, and two ends of the secondary coil of the boosting transformer are connected to two input ends of the penicillin bridge through the anti-electromagnetic interference filter circuit.
The utility model has the advantages that: the utility model relates to a novel withstand voltage meson of ultralow frequency decreases tester adopts anti-electromagnetic interference filter circuit to record between step up transformer and xiLin electric bridge, can the inside step up transformer's of filtering electromagnetic interference to improve measurement accuracy.
On the basis of the technical scheme, the utility model discloses can also do following improvement.
Furthermore, the anti-electromagnetic interference filter circuit and the penicillin bridge are integrated on the PCB, a shielding cover is arranged on the PCB, a shielding cavity is formed between the shielding cover and the PCB, and the anti-electromagnetic interference filter circuit and the penicillin bridge are located in the shielding cavity.
The beneficial effect of adopting the further scheme is that: the shielding cover can shield external radiation interference, and measurement accuracy is further improved.
Furthermore, the shielding cover is a wave-shaped cover body made of shielding materials, and heat dissipation holes are formed in the top of the shielding cover.
The beneficial effect of adopting the further scheme is that: the heat dissipation holes are favorable for heat dissipation, and the service life is prolonged.
Further, the top inboard of shield cover is equipped with heat conduction silica gel, the top outside of shield cover is equipped with the fin, heat conduction silica gel with the fin is just right.
The beneficial effect of adopting the further scheme is that: the heat-conducting silica gel and the radiating fins can further improve the radiating effect.
Further, the anti-electromagnetic interference filter circuit comprises a differential mode inductor L1, a differential mode inductor L2, a capacitor C1, a capacitor C2, a capacitor C3 and a common mode inductor L3; one end of the differential mode inductor L1 is connected to one end of the secondary coil of the step-up transformer, and the other end of the differential mode inductor L1 is connected to one end of one coil of the common mode inductor L3; one end of the differential mode inductor L2 is connected to the other end of the secondary coil of the step-up transformer, and the other end of the differential mode inductor L2 is connected to one end of the other coil of the common mode inductor L3; one end of the capacitor C1 is connected to the common terminal of the differential-mode inductor L1 and the common-mode inductor L3, and the other end of the capacitor C1 is connected to the common terminal of the differential-mode inductor L2 and the common-mode inductor L3; the other end of one coil of the common-mode inductor L3 and the other end of the other coil of the common-mode inductor L3 are respectively connected to two input ends of the penicillin bridge; two ends of the capacitor C2 are connected to two ends of one coil of the common-mode inductor L3; two ends of the capacitor C3 are connected to two ends of the other coil of the common mode inductor L3.
The beneficial effect of adopting the further scheme is that: differential mode inductance L1, differential mode inductance L2, electric capacity C1, electric capacity C2, electric capacity C3 and common mode inductance L3 constitute the highly compressed filter circuit of low pass, can filtering differential mode noise and common mode noise, very practical in the utility model discloses a withstand voltage dielectric loss tester of ultralow frequency.
Drawings
Fig. 1 is a block diagram of a circuit structure of a novel ultralow frequency withstand voltage dielectric loss tester of the present invention;
fig. 2 is a schematic circuit diagram of an anti-electromagnetic interference filter circuit.
Detailed Description
The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.
As shown in fig. 1, a novel ultra-low frequency voltage-withstanding dielectric loss tester comprises an ultra-low frequency alternating current voltage source, a step-up transformer, an anti-electromagnetic interference filter circuit and a penicillin bridge; and two ends of the primary coil of the boosting transformer are connected to the output end of the ultralow-frequency alternating-current voltage source, and two ends of the secondary coil of the boosting transformer are connected to two input ends of the penicillin bridge through the anti-electromagnetic interference filter circuit.
In this particular embodiment:
the anti-electromagnetic interference filter circuit and the penicillin electric bridge are integrated on the PCB, a shielding cover is arranged on the PCB, a shielding cavity is formed between the shielding cover and the PCB, and the anti-electromagnetic interference filter circuit and the penicillin electric bridge are positioned in the shielding cavity; the shielding cover can shield external radiation interference, and measurement accuracy is further improved. The shielding cover is a wave-shaped cover body made of shielding materials, and heat dissipation holes are formed in the top of the shielding cover; the heat dissipation holes are favorable for heat dissipation, and the service life is prolonged. The inner side of the top of the shielding cover is provided with heat-conducting silica gel, the outer side of the top of the shielding cover is provided with a radiating fin, and the heat-conducting silica gel is opposite to the radiating fin; the heat-conducting silica gel and the radiating fins can further improve the radiating effect.
As shown in fig. 2, the anti-electromagnetic interference filter circuit includes a differential-mode inductor L1, a differential-mode inductor L2, a capacitor C1, a capacitor C2, a capacitor C3, and a common-mode inductor L3; one end of the differential mode inductor L1 is connected to one end of the secondary coil of the step-up transformer, and the other end of the differential mode inductor L1 is connected to one end of one coil of the common mode inductor L3; one end of the differential mode inductor L2 is connected to the other end of the secondary coil of the step-up transformer, and the other end of the differential mode inductor L2 is connected to one end of the other coil of the common mode inductor L3; one end of the capacitor C1 is connected to the common terminal of the differential-mode inductor L1 and the common-mode inductor L3, and the other end of the capacitor C1 is connected to the common terminal of the differential-mode inductor L2 and the common-mode inductor L3; the other end of one coil of the common-mode inductor L3 and the other end of the other coil of the common-mode inductor L3 are respectively connected to two input ends of the penicillin bridge; two ends of the capacitor C2 are connected to two ends of one coil of the common-mode inductor L3; two ends of the capacitor C3 are connected to two ends of the other coil of the common mode inductor L3. Differential mode inductance L1, differential mode inductance L2, electric capacity C1, electric capacity C2, electric capacity C3 and common mode inductance L3 constitute the highly compressed filter circuit of low pass, can filtering differential mode noise and common mode noise, very practical in the utility model discloses a withstand voltage dielectric loss tester of ultralow frequency.
The utility model relates to a novel withstand voltage meson of ultralow frequency decreases tester adopts anti-electromagnetic interference filter circuit to record between step up transformer and xiLin electric bridge, can the inside step up transformer's of filtering electromagnetic interference to improve measurement accuracy.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (5)
1. The utility model provides a novel withstand voltage of ultralow frequency is situated between and is decreased tester which characterized in that: the device comprises an ultralow frequency alternating current voltage source, a boosting transformer, an anti-electromagnetic interference filter circuit and a penicillin bridge; and two ends of the primary coil of the boosting transformer are connected to the output end of the ultralow-frequency alternating-current voltage source, and two ends of the secondary coil of the boosting transformer are connected to two input ends of the penicillin bridge through the anti-electromagnetic interference filter circuit.
2. The novel ultralow frequency voltage-withstanding dielectric loss tester as claimed in claim 1, wherein: the anti-electromagnetic interference filter circuit and the penicillin electric bridge are integrated on the PCB, a shielding cover is arranged on the PCB, a shielding cavity is formed between the shielding cover and the PCB, and the anti-electromagnetic interference filter circuit and the penicillin electric bridge are located in the shielding cavity.
3. The novel ultralow frequency voltage-withstanding dielectric loss tester as claimed in claim 2, wherein: the shielding cover is a wave-shaped cover body made of shielding materials, and heat dissipation holes are formed in the top of the shielding cover.
4. The novel ultralow frequency voltage-withstanding dielectric loss tester as claimed in claim 2, wherein: the top inboard of shield cover is equipped with heat conduction silica gel, the top outside of shield cover is equipped with the fin, heat conduction silica gel with the fin is just right.
5. The novel ultralow frequency voltage-withstanding dielectric loss tester as claimed in any one of claims 1 to 4, wherein: the anti-electromagnetic interference filter circuit comprises a differential mode inductor L1, a differential mode inductor L2, a capacitor C1, a capacitor C2, a capacitor C3 and a common mode inductor L3; one end of the differential mode inductor L1 is connected to one end of the secondary coil of the step-up transformer, and the other end of the differential mode inductor L1 is connected to one end of one coil of the common mode inductor L3; one end of the differential mode inductor L2 is connected to the other end of the secondary coil of the step-up transformer, and the other end of the differential mode inductor L2 is connected to one end of the other coil of the common mode inductor L3; one end of the capacitor C1 is connected to the common terminal of the differential-mode inductor L1 and the common-mode inductor L3, and the other end of the capacitor C1 is connected to the common terminal of the differential-mode inductor L2 and the common-mode inductor L3; the other end of one coil of the common-mode inductor L3 and the other end of the other coil of the common-mode inductor L3 are respectively connected to two input ends of the penicillin bridge; two ends of the capacitor C2 are connected to two ends of one coil of the common-mode inductor L3; two ends of the capacitor C3 are connected to two ends of the other coil of the common mode inductor L3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920921759.1U CN210835073U (en) | 2019-06-19 | 2019-06-19 | Novel ultralow frequency withstand voltage dielectric loss tester |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920921759.1U CN210835073U (en) | 2019-06-19 | 2019-06-19 | Novel ultralow frequency withstand voltage dielectric loss tester |
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| Publication Number | Publication Date |
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| CN210835073U true CN210835073U (en) | 2020-06-23 |
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| CN201920921759.1U Active CN210835073U (en) | 2019-06-19 | 2019-06-19 | Novel ultralow frequency withstand voltage dielectric loss tester |
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