CN212781063U - Generator partial discharge measuring device - Google Patents
Generator partial discharge measuring device Download PDFInfo
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- CN212781063U CN212781063U CN202020759664.7U CN202020759664U CN212781063U CN 212781063 U CN212781063 U CN 212781063U CN 202020759664 U CN202020759664 U CN 202020759664U CN 212781063 U CN212781063 U CN 212781063U
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Abstract
The utility model relates to a generator partial discharge measuring device, including three detection impedance module, three signal processing module, analog-to-digital conversion module and industrial control computer, three detection impedance module concatenates the three-phase voltage transformer secondary side at the generator export respectively, and three output that detects the impedance module passes through coaxial cable and inserts three signal processing module, and three signal is put through coaxial cable and is inserted high-speed analog-to-digital conversion module and realize data synchronization collection after processing module takes care of and enlargies. The utility model discloses utilize the existing voltage transformer of generator export as partial discharge sensor, can avoid inserting coupling capacitor or installing a large amount of stator slot couplers at the stator slot at the high-voltage bus, can avoid introducing safe risk when reducing the device construction cost, provide the effectual generator partial discharge measurement means of safe economy, have the significance to promoting the popularization and application of partial discharge in the generator.
Description
Technical Field
The utility model belongs to power equipment on-line monitoring field, concretely relates to generator partial discharge measuring device.
Background
The main insulation fault of the generator can cause the damage accident of the generator, threaten the safety of a power station and a power grid, and cause huge economic loss and serious social influence. Partial discharge is an important feature reflecting the health of the main insulation of the generator, and therefore, people try to grasp the health of the main insulation of the generator through partial discharge monitoring. The frequency band of partial discharge signals ranges from tens of kilohertz to hundreds of megahertz, even gigahertz, and the sensing of generator partial discharge signals is generally realized by installing coupling capacitors on the outlet bus bars or installing stator slot couplers in the generator stator slots. Chinese patent publication No. CN101655538, 24/2/2010, the name of the utility model is a generator partial discharge on-line monitoring device and a monitoring method thereof, and this application discloses a generator partial discharge monitoring method based on a plurality of coupling capacitors. The defects that the used coupling capacitor is directly connected with an outlet bus of a generator, and the insulation part 2 of the stator winding of the rotating motor according to GB/T20833.2-2016 are as follows: the coupling capacitor may cause a failure to ground on an online partial discharge measurement. Chinese patent publication No. CN106199344A, publication No. 2016, 12, 7, and the name of the creation of the utility model is the generator partial discharge on-line monitoring device, and this application discloses a generator partial discharge on-line monitoring device based on a stator slot coupler. The method has the disadvantages that the used stator slot couplers are arranged in the stator slots of the generator, additional insulation risks are introduced, the number of the stator slots of the large-scale generator is hundreds, and a large number of stator slot couplers are required to be arranged to realize coverage monitoring of partial discharge of the whole stator winding.
SUMMERY OF THE UTILITY MODEL
In order to overcome the not enough of current generator partial discharge measuring device and method, the utility model provides a generator partial discharge measuring device compares prior art, can realize generator partial discharge's safe economy and effective measurement.
In order to achieve the above purpose, the technical scheme is as follows:
the device is characterized by comprising three detection impedance modules, three signal processing modules, an industrial control computer and an analog-to-digital conversion module in the industrial control computer, wherein the three detection impedance modules are respectively connected in series with the secondary side of a voltage transformer on a three-phase bus at the outlet of a generator, the outputs of the three detection impedance modules are respectively connected into the three signal processing modules, and the outputs of the three signal processing modules are connected into the analog-to-digital conversion module.
Further, the impedance detection module comprises two input ends and an output end, and the output end is a BNC connector; two input ends of the impedance measuring module are connected in series with the secondary side of a voltage transformer on a three-phase bus at the outlet of the generator.
Furthermore, the signal processing module comprises an analog input end, an analog output end and two switching value input ends, the analog input end and the analog output end are BNC connectors, the input end of the signal processing module is connected with the output end of the detection impedance module through a coaxial cable, and the analog output end is connected with the analog-to-digital conversion module. The input signals of the two switching value input ends are remotely controlled by an industrial control computer.
Furthermore, the signal processing module comprises a band-pass filtering unit and an amplifying unit, wherein a module input signal is connected with the band-pass filtering unit for processing, and is connected with the amplifying unit for amplifying after being processed, and the amplifying signal is connected with the analog quantity output end of the module.
Furthermore, the passband of the band-pass filtering unit is 100 kHz-50 MHz, the amplification factor of the amplifying unit comprises a plurality of selectable stages, the amplification factor is determined by two switching value inputs of the module, and the two switching value inputs are remotely controlled by an industrial control computer.
Furthermore, the analog-to-digital conversion module comprises more than two switching value output ports, the switching value output is controlled by an industrial control computer and is used as the control input of the signal processing module, and the maximum rate of analog-to-digital conversion is not lower than 100 MS/s.
The utility model has the advantages that: because the utility model discloses an existing export voltage transformer replacement of generator is coupling capacitor and stator slot coupler commonly used at present as partial discharge sensor, can effectively reduce the device construction cost to can avoid inserting coupling capacitor or the safe risk that a large amount of couplers of installation were introduced at the stator slot at high-voltage bus, provide the effectual generator partial discharge measurement means of safe economy, can effectively promote the popularization and application of partial discharge measurement in the generator.
Drawings
Fig. 1 is a schematic structural diagram of the generator partial discharge measurement apparatus of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific examples.
As shown in fig. 1, the utility model provides a generator partial discharge measuring device, including three detection impedance module 1, 2, 3 and three signal processing module 4, 5, 6, high-speed analog-to-digital conversion module 7 and industrial control computer 8, wherein detect impedance module 1, 2, 3 and concatenate the voltage transformer PT secondary side on generator export three-phase bus respectively, high-speed analog-to-digital conversion module 7 is installed in industrial control computer 8, detect impedance module 1, 2, 3's output and insert signal processing module 4 respectively, 5, 6, signal processing module 4, 5, 6's output connects high-speed analog-to-digital conversion module 7.
The detection impedance modules 1, 2 and 3 are respectively a resistive detection terminal GPD _ S, the resistive detection terminal GPD _ S comprises two input ends and an output end, and the output end is a BNC connector.
The signal processing modules 4, 5 and 6 are respectively a signal conditioner GPD _ M, the signal conditioner GPD _ M comprises an analog input end, an analog output end and two switching value input ends, and the input end and the output end are BNC connectors. The input ends of the signal processing modules 4, 5 and 6 are respectively connected with the output ends of the detection impedance modules 1, 2 and 3 through coaxial cables.
The GPDGPD _ M comprises a band-pass filtering unit and an amplifying unit, wherein a GPD _ M input signal is connected with the band-pass filtering unit for processing, and then is connected with the amplifying unit for amplifying, and the amplifying signal is connected with the analog quantity output end of the module.
The passband of the band-pass filtering unit is 100 kHz-50 MHz, the amplification factor of the amplifying unit comprises three stages of 1, 10 and 100, the amplification factor is determined by two switching value inputs of GPD _ M, and the two switching value inputs are remotely controlled by an industrial control computer 8.
The high-speed analog-to-digital conversion module 7 is a Mohua PCIe-1840, the PCIe-1840 comprises two switching value output ports, the switching value output is controlled by measurement software in an industrial control calculation 8, the PCIe-1840 comprises four analog value input channels, the maximum speed of single-channel analog-to-digital conversion is 125MS/s, the resolution is 16 bits, and the single-channel storage capacity is 2G sampling points.
The utility model discloses a generator partial discharge measuring device carries out generator partial discharge measuring step and includes:
three detection impedance modules 1, 2 and 3 pick up partial discharge signals of a three-phase winding of the generator from the secondary side of a voltage transformer on a three-phase bus at the outlet of the generator;
the picked partial discharge signals of the three-phase winding are conditioned by three signal processing modules 4, 5 and 6 and then are amplified and transmitted to a high-speed analog-to-digital conversion module 7 through a coaxial cable for synchronous acquisition;
the industrial control computer 8 utilizes a wavelet threshold denoising method to denoise the collected partial discharge signal;
the industrial control computer 8 extracts the partial discharge pulses and calculates the amplitude and the number of the partial discharge pulses of the three-phase winding, thereby evaluating the health condition of the main insulation of the generator.
The above description is given for the purpose of illustration only, and not for the purpose of limitation, of the present invention, and it is intended that all equivalent alterations and modifications within the spirit and scope of the invention be covered by the appended claims.
Claims (6)
1. The device is characterized by comprising three detection impedance modules, three signal processing modules, an industrial control computer and an analog-to-digital conversion module in the industrial control computer, wherein the three detection impedance modules are respectively connected in series with the secondary side of a voltage transformer on a three-phase bus at the outlet of a generator, the outputs of the three detection impedance modules are respectively connected into the three signal processing modules, and the outputs of the three signal processing modules are connected into the analog-to-digital conversion module.
2. The partial discharge measurement device of the generator according to claim 1, wherein the impedance detection module comprises two input terminals and an output terminal, and the output terminal is a BNC connector; two input ends of the impedance measuring module are connected in series with the secondary side of a voltage transformer on a three-phase bus at the outlet of the generator.
3. The generator partial discharge measurement device of claim 1, wherein the signal processing module comprises an analog input terminal, an analog output terminal and two switching value input terminals, the analog input terminal and the analog output terminal are BNC connectors, the input terminal of the signal processing module is connected to the output terminal of the detection impedance module through a coaxial cable, and the analog output terminal is connected to the analog-to-digital conversion module.
4. The generator partial discharge measurement device of claim 1 or 3, wherein the signal processing module comprises a band-pass filtering unit and an amplifying unit, an input signal of the module is connected with the band-pass filtering unit for processing, and is connected to the amplifying unit for amplifying after processing, and the amplified signal is connected with the analog output end of the module.
5. The generator partial discharge measurement device of claim 4, wherein the passband of the band-pass filter unit is 100 kHz-50 MHz, the amplification factor of the amplification unit comprises selectable multiple stages, the amplification factor is determined by two switching value inputs of the module, and the two switching value inputs are remotely controlled by an industrial control computer.
6. The generator partial discharge measurement device of claim 1, wherein the analog-to-digital conversion module comprises more than two switching value output ports, the switching value output ports are controlled by an industrial control computer and are used as control input of the signal processing module, and the maximum analog-to-digital conversion rate is not lower than 100 MS/s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020759664.7U CN212781063U (en) | 2020-05-09 | 2020-05-09 | Generator partial discharge measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020759664.7U CN212781063U (en) | 2020-05-09 | 2020-05-09 | Generator partial discharge measuring device |
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| Publication Number | Publication Date |
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| CN212781063U true CN212781063U (en) | 2021-03-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020759664.7U Active CN212781063U (en) | 2020-05-09 | 2020-05-09 | Generator partial discharge measuring device |
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| CN (1) | CN212781063U (en) |
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- 2020-05-09 CN CN202020759664.7U patent/CN212781063U/en active Active
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