CN211955712U - Generator outlet voltage transformer insulation fault comprehensive diagnosis device - Google Patents
Generator outlet voltage transformer insulation fault comprehensive diagnosis device Download PDFInfo
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- CN211955712U CN211955712U CN202020358081.3U CN202020358081U CN211955712U CN 211955712 U CN211955712 U CN 211955712U CN 202020358081 U CN202020358081 U CN 202020358081U CN 211955712 U CN211955712 U CN 211955712U
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Abstract
The utility model discloses a generator outlet voltage transformer insulation fault comprehensive diagnosis device, including power, main charging capacitor, controllable electronic switch, voltage transformer, high-voltage partial voltage capacitor, low-voltage partial voltage capacitor, coupling capacitance and detection impedance, the positive end of power is connected with one end of main charging capacitor and one end of controllable electronic switch, the other end of main charging capacitor is connected with the negative end of power, the other end of controllable electronic switch is connected with one end of the primary winding of voltage transformer, the other end of the primary winding of voltage transformer is connected with the other end of main charging capacitor; the high-voltage-dividing capacitor is connected with the low-voltage-dividing capacitor in series, the non-series end of the high-voltage-dividing capacitor is connected with one end of a primary winding of the voltage transformer, the non-series end of the low-voltage-dividing capacitor is connected with the other end of the primary winding of the voltage transformer, and a wave recorder is connected to the connecting line of the high-voltage-dividing capacitor and the low-voltage-dividing capacitor; the utility model has the advantages that: simple operation and strong adaptability.
Description
Technical Field
The utility model relates to a voltage transformer insulation fault check out test set technical field below 35kV and, more specifically relate to a generator outlet voltage transformer insulation fault comprehensive diagnosis device.
Background
At present, means for detecting turn-to-turn or interlayer insulation of a voltage transformer at the outlet of a generator mainly comprise direct current resistance measurement, no-load current measurement, lightning impulse withstand voltage, alternating current withstand voltage, partial discharge measurement and the like. The direct current resistance and the no-load current are more suitable for diagnosis after a fault, and the detection of the early insulation defect is not sensitive enough; the lightning impulse withstand voltage belongs to destructive tests, is only developed before delivery and is influenced by the distributed capacitance among turns and layers of a primary winding and the capacitance to ground, and the method has no obvious effect on detecting the defects of an inner-layer coil close to an iron core; the alternating current withstand voltage is also a destructive test, the short test period can influence the service life of the voltage transformer to increase the defect rate, and meanwhile, the method has low defect detection rate; partial discharge measurement is an effective means for detecting defects of the voltage transformer, but has strict requirements on electromagnetic environment and is only effectively developed in a laboratory, and the method has certain omission factor on a coil at a low potential, such as: in the all-insulation voltage transformer with the partial discharge defect, the A end and the N end are respectively grounded to measure the partial discharge quantity, and obvious difference exists.
Aiming at the defects of the test device and the test method in the field insulation detection of the voltage transformer at the outlet of the generator, the comprehensive insulation detection device for the voltage transformer at the outlet of the generator, which is simple to operate and strong in environmental adaptability, needs to be researched.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a generator outlet voltage transformer carries out comprehensive insulation detection, easy operation, and environmental suitability's generator outlet voltage transformer insulation fault comprehensive diagnosis device is provided.
The utility model discloses a following technical means realizes solving above-mentioned technical problem: a comprehensive insulation fault diagnosis device for a voltage transformer at an outlet of a generator comprises a power supply, a main charging capacitor, a controllable electronic switch, a voltage transformer, a high-voltage-dividing capacitor, a low-voltage-dividing capacitor, a coupling capacitor and a detection impedance, wherein the positive end of the power supply is connected with one end of the main charging capacitor and one end of the controllable electronic switch, the other end of the main charging capacitor is connected with the negative end of the power supply, the other end of the controllable electronic switch is connected with one end of a primary winding of the voltage transformer, and the other end of the primary winding of the voltage transformer is connected with the other end of the main charging capacitor; the high-voltage-dividing capacitor is connected with the low-voltage-dividing capacitor in series, the non-series end of the high-voltage-dividing capacitor is connected with one end of a primary winding of the voltage transformer, the non-series end of the low-voltage-dividing capacitor is connected with the other end of the primary winding of the voltage transformer, a wave recorder is connected to the connecting line of the high-voltage-dividing capacitor and the low-voltage-dividing capacitor, and the non-series end of the low-voltage; one end of the coupling capacitor is connected with the non-series end of the high-voltage-dividing capacitor, the other end of the coupling capacitor is connected with the primary starting end of the detection impedance, and the primary tail end of the detection impedance is grounded.
The utility model discloses generator export voltage transformer primary winding is external circuit performance in certain frequency range for the perception component, takes place the turn-to-turn or around the interlaminar trouble, and voltage transformer primary winding's inductance value can change, and the change of inductance value arouses the change of pulse oscillation voltage frequency. The recorder completes real-time monitoring and recording of waveforms, compares voltage waveform deviation on a primary winding of the voltage transformer under different amplitude voltages, judges whether the winding has inter-turn or interlayer insulation defects, is simple to operate and high in environmental adaptability, and is suitable for insulation detection of equipment in various units such as laboratories, power plants, transformer substations and manufacturers.
Furthermore, the insulation fault comprehensive diagnosis device for the voltage transformer at the outlet of the generator further comprises a plurality of fiber bragg grating temperature sensors and a temperature display instrument, wherein the fiber bragg grating temperature sensors are attached to the surface of the voltage transformer, and the fiber bragg grating temperature sensors are connected with the temperature display instrument.
Further, the temperature display instrument is of the type FGWD-2000 GS.
Further, the generator outlet voltage transformer insulation fault comprehensive diagnosis device further comprises an ultrasonic sensor and an ultrasonic detector, wherein the ultrasonic sensor is attached to the surface of the voltage transformer and connected with the ultrasonic detector.
Further, the model of the ultrasonic detector is PD 208.
Furthermore, the insulation fault comprehensive diagnosis device for the voltage transformer at the outlet of the generator further comprises an partial discharge detector, a center tap of the detection impedance is suspended, the output end of the detection impedance is connected with the partial discharge detector, and the grounding end of the detection impedance is grounded.
Furthermore, the partial discharge detector is a TWPD-2 digital partial discharge comprehensive analyzer.
Further, the detection impedance is an XD51ZD high current detection impedance.
Further, the model of the wave recorder is WAVESURFER-10.
The utility model has the advantages that:
(1) the utility model discloses generator export voltage transformer primary winding is external circuit performance in certain frequency range for the perception component, takes place the turn-to-turn or around the interlaminar trouble, and voltage transformer primary winding's inductance value can change, and the change of inductance value arouses the change of pulse oscillation voltage frequency. The recorder completes real-time monitoring and recording of waveforms, compares voltage waveform deviation on a primary winding of the voltage transformer under different amplitude voltages, judges whether the winding has inter-turn or interlayer insulation defects, is simple to operate and high in environmental adaptability, and is suitable for insulation detection of equipment in various units such as laboratories, power plants, transformer substations and manufacturers.
(2) The temperature change is converted into the Bragg wavelength movement by utilizing the effective refractive index of the fiber grating temperature sensor and the temperature sensitivity characteristic of the grating period, the contact temperature is measured by detecting the central wavelength movement amount reflected by the grating, and the sensor is attached to the surface of the transformer to perform the distribution detection of the surface temperature field of the transformer. Under the action of higher pulse voltage, when insulation fault exists in the transformer, local heating occurs, and the insulation condition in the transformer is analyzed by using the temperature change of each measuring point.
(3) The insulation deterioration in the voltage transformer is accompanied by the occurrence of discharge, sound wave signals are generated while the discharge of the voltage transformer is carried out, the ultrasonic sensor is attached to the surface of the transformer to collect the sound wave signals when the discharge of the voltage transformer is within the range of 20kHz to 200kHz, and real-time ultrasonic signal detection is realized through an ultrasonic detector, so that whether insulation deterioration exists in the voltage transformer or not is confirmed.
(4) The utility model discloses impulse current method detection circuitry comprises coupling capacitance and detection impedance and partial discharge detector, just can judge whether there is partial discharge through pulse current size in the detection circuitry to whether the inside partial discharge trouble takes place of detection voltage transformer.
Drawings
Fig. 1 is a schematic diagram of an insulation fault comprehensive diagnosis device for a generator outlet voltage transformer according to an embodiment of the present invention.
Detailed Description
To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1, the comprehensive insulation fault diagnosis device for the voltage transformer at the outlet of the generator comprises a power supply E, a main charging capacitor C, a controllable electronic switch S, a voltage transformer PT, a high-voltage dividing capacitor C1, a low-voltage dividing capacitor C2, a coupling capacitor Ck, a detection impedance Zm, a plurality of fiber bragg grating temperature sensors, a temperature display instrument 1, an ultrasonic detector 2, a wave recorder 3, a partial discharge detector 4 and an ultrasonic sensor W4, wherein the detection impedance is XD51ZD large-current detection impedance. The model of the wave recorder is WAVESURFER-10.
The positive end of the power supply E is connected with one end of a main charging capacitor C and one end of a controllable electronic switch S, the other end of the main charging capacitor C is connected with the negative end of the power supply E, the other end of the controllable electronic switch S is connected with one end of a primary winding L of a voltage transformer PT, and the other end of the primary winding L of the voltage transformer PT is connected with the other end of the main charging capacitor C; the high-voltage-dividing capacitor C1 is connected with the low-voltage-dividing capacitor C2 in series, the non-series end of the high-voltage-dividing capacitor C1 is connected with one end of a primary winding L of a voltage transformer PT, the non-series end of the low-voltage-dividing capacitor C2 is connected with the other end of the primary winding of the voltage transformer PT, the high-voltage-dividing capacitor C1 is connected with the low-voltage-dividing capacitor C2 in a connecting line and connected with the oscillograph 3, and the non-series end of the low-; one end of the coupling capacitor Ck is connected with the non-series end of the high-voltage dividing capacitor C1, the other end of the coupling capacitor Ck is connected with the primary starting end of the detection impedance Zm, and the primary tail end of the detection impedance Zm is grounded.
With continued reference to FIG. 1, the temperature display 1 is of the type FGWD-2000 GS. The fiber bragg grating temperature sensors (shown in figures W1, W2 and W3) are attached to the surface of the voltage transformer PT, and are all connected with the temperature display instrument 1.
Continuing to refer to FIG. 1, the ultrasonic testing machine 2 is model PD 208. Ultrasonic sensor W4 laminating is in the surface of voltage transformer PT, ultrasonic sensor W4 is connected with ultrasonic detector 2.
With continued reference to fig. 1, the partial discharge detector 4 is a TWPD-2 digital partial discharge comprehensive analyzer. The center tap of the detection impedance Zm is suspended, the output end of the detection impedance Zm is connected with the partial discharge detector 4, and the grounding end of the detection impedance Zm is grounded.
Through the technical scheme, the utility model provides a pair of generator export voltage transformer insulation fault comprehensive diagnosis device, generator export voltage transformer primary winding L is the inductive element to external circuit expression in certain frequency range, takes place the turn-to-turn or around the layer fault, and voltage transformer PT's primary winding L's inductance value can change, and the change of inductance value arouses the change of pulse oscillation voltage frequency. The recorder 3 completes real-time monitoring and recording of waveforms, compares voltage waveform deviation on a primary winding L of a voltage transformer PT under different amplitude voltages, judges whether a winding has inter-turn or interlayer insulation defects, is simple to operate, has strong environmental adaptability, and is suitable for insulation detection of equipment in various units such as laboratories, power plants, transformer substations, manufacturers and the like. The temperature change is converted into the Bragg wavelength movement by utilizing the effective refractive index of the fiber grating temperature sensors (W1, W2 and W3) and the sensitivity of the grating period to the temperature, the contact temperature is measured by detecting the central wavelength movement amount reflected by the grating, and the sensors are attached to the surface of the potential transformer PT to detect the distribution of the temperature field on the surface of the potential transformer PT. Under the action of higher pulse voltage, when insulation fault exists in the voltage transformer PT, local heating occurs, and the insulation condition in the voltage transformer PT is analyzed by using the temperature change of each measuring point. The insulation deterioration in the voltage transformer PT is accompanied by the occurrence of discharge, and sound wave signals are generated while discharging, and the sound wave signals discharged by the voltage transformer PT are in the range of 20kHz to 200kHz, and the ultrasonic sensor W4 is attached to the surface of the voltage transformer PT for collecting the sound wave signals, so that the ultrasonic detector 2 can realize real-time ultrasonic signal detection, and whether insulation deterioration exists in the voltage transformer PT or not is confirmed. The utility model discloses pulse current method detection circuit is put detector 4 by coupling capacitance Ck and detection impedance Zm and office and is constituted, just can judge whether there is partial discharge through pulse current size in the detection circuit to whether the inside partial discharge trouble takes place of detection voltage transformer PT.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (9)
1. The comprehensive insulation fault diagnosis device for the voltage transformer at the outlet of the generator is characterized by comprising a power supply, a main charging capacitor, a controllable electronic switch, a voltage transformer, a high-voltage-dividing capacitor, a low-voltage-dividing capacitor, a coupling capacitor and a detection impedance, wherein the positive end of the power supply is connected with one end of the main charging capacitor and one end of the controllable electronic switch, the other end of the main charging capacitor is connected with the negative end of the power supply, the other end of the controllable electronic switch is connected with one end of a primary winding of the voltage transformer, and the other end of the primary winding of the voltage transformer is connected with the other end of the main charging capacitor; the high-voltage-dividing capacitor is connected with the low-voltage-dividing capacitor in series, the non-series end of the high-voltage-dividing capacitor is connected with one end of a primary winding of the voltage transformer, the non-series end of the low-voltage-dividing capacitor is connected with the other end of the primary winding of the voltage transformer, a wave recorder is connected to the connecting line of the high-voltage-dividing capacitor and the low-voltage-dividing capacitor, and the non-series end of the low-voltage; one end of the coupling capacitor is connected with the non-series end of the high-voltage-dividing capacitor, the other end of the coupling capacitor is connected with the primary starting end of the detection impedance, and the primary tail end of the detection impedance is grounded.
2. The comprehensive insulation fault diagnosis device for the voltage transformer at the outlet of the generator as claimed in claim 1, further comprising a plurality of fiber grating temperature sensors and a temperature display, wherein the plurality of fiber grating temperature sensors are attached to the surface of the voltage transformer, and the plurality of fiber grating temperature sensors are all connected with the temperature display.
3. The integrated diagnostic device for insulation faults of the voltage transformer at the outlet of the generator as claimed in claim 2, wherein the type of the temperature display instrument is FGWD-2000 GS.
4. The comprehensive insulation fault diagnosis device for the voltage transformer at the outlet of the generator as claimed in claim 1, further comprising an ultrasonic sensor and an ultrasonic detector, wherein the ultrasonic sensor is attached to the surface of the voltage transformer and is connected with the ultrasonic detector.
5. The comprehensive diagnosis device for insulation fault of voltage transformer at outlet of generator as claimed in claim 4, wherein said ultrasonic detector is PD 208.
6. The apparatus according to claim 1, further comprising an partial discharge detector, wherein a center tap of the detection impedance is suspended, an output terminal of the detection impedance is connected to the partial discharge detector, and a ground terminal of the detection impedance is grounded.
7. The comprehensive diagnosis device for the insulation fault of the voltage transformer at the outlet of the generator as claimed in claim 6, wherein the partial discharge detector is a TWPD-2 digital partial discharge comprehensive analyzer.
8. The comprehensive insulation fault diagnosis device for the generator outlet voltage transformer according to claim 1, wherein the detection impedance is an XD51ZD large current detection impedance.
9. The comprehensive diagnosis device for insulation fault of voltage transformer at outlet of generator as claimed in claim 1, wherein said recorder is WAVESURFER-10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202020358081.3U CN211955712U (en) | 2020-03-20 | 2020-03-20 | Generator outlet voltage transformer insulation fault comprehensive diagnosis device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020358081.3U CN211955712U (en) | 2020-03-20 | 2020-03-20 | Generator outlet voltage transformer insulation fault comprehensive diagnosis device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113251942A (en) * | 2021-07-14 | 2021-08-13 | 四川大学 | Generator stator fault monitoring method and device based on strain and acoustic wave sensing |
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2020
- 2020-03-20 CN CN202020358081.3U patent/CN211955712U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113251942A (en) * | 2021-07-14 | 2021-08-13 | 四川大学 | Generator stator fault monitoring method and device based on strain and acoustic wave sensing |
| CN113251942B (en) * | 2021-07-14 | 2021-09-14 | 四川大学 | Generator stator fault monitoring method and device based on strain and acoustic wave sensing |
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