CN114280432A - Cable partial discharge monitoring equipment and method - Google Patents
Cable partial discharge monitoring equipment and method Download PDFInfo
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- CN114280432A CN114280432A CN202111407197.7A CN202111407197A CN114280432A CN 114280432 A CN114280432 A CN 114280432A CN 202111407197 A CN202111407197 A CN 202111407197A CN 114280432 A CN114280432 A CN 114280432A
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Abstract
The invention relates to a cable partial discharge monitoring device and a method, wherein the cable partial discharge monitoring device comprises: the sampling chip supports four-channel low-speed sampling and supports switching to one-channel high-speed sampling; the filter circuit is electrically connected with the sampling chip and comprises three paths of low-pass filter circuits, one path of high-pass filter circuit and a 50Hz low-pass filter circuit; the three gates are respectively electrically connected with the three low-pass filter circuits, the high-pass filter circuits are electrically connected with the three gates, and the 50Hz low-pass filter circuit is electrically connected with the gate corresponding to the A of the cable; and the three HFCT sensors are electrically connected with the three gates in a one-to-one correspondence manner, and are respectively sleeved on the phase A, the phase B and the phase C of the cable. The invention samples A phase, B phase and C phase at the same low frequency by three low-pass filter circuits, one phase is sampled at high frequency by the high-pass filter circuit, and the 50Hz alternating current signal of A phase is sampled by the 50Hz low-pass filter circuit, thus the sampling effect is good.
Description
Technical Field
The invention relates to the field of cable partial discharge monitoring, in particular to a device and a method for monitoring cable partial discharge.
Background
The cable is visible everywhere in daily production and life, and along with the increase of dependence of people on electricity, more and more cables and the probability of accidents are correspondingly increased. One of the main causes of cable accidents is the presence of defects in the insulation of the cable, producing partial discharges that accelerate the deterioration of the insulation properties of the cable, eventually leading to a breakdown of the cable. The existing partial discharge acquisition scheme mainly has the following 3 problems:
1. if the sampling chips of 400Mhz are adopted, the power consumption is large. If the sampling chips of 100Mhz are adopted, the accurate sampling of higher frequency cannot be realized. If separate 4 sampling chips are used, it is difficult to implement the synchronous sampling technique. The chip with variable channels and sampling rate can well solve the problems of power consumption and performance and can realize synchronous sampling.
2. The traditional method has the defects that original signals are directly input into a sampling chip, and signal processing of each frequency band is not facilitated. Aiming at the problem, a circuit which adopts matched filtering at the input front ends with different sampling rates is specially designed.
3. The traditional partial discharge needs current phase alignment, and only needs to rely on an additional transformer to obtain a current signal, so that the additional transformer and the Rogowski coil need to be additionally arranged. Through analysis and practice, the 50hz phase signal can be obtained by firstly passing the partial discharge signal through the integrating circuit and then passing through the 50hz low-frequency filtering, and although the specific current value of the 50hz current signal cannot be restored, the partial discharge phase analysis processing is sufficient.
Disclosure of Invention
The invention aims to provide a cable partial discharge monitoring device which has the characteristics of good sampling effect and the like and has good applicability.
In order to achieve the purpose, the invention adopts the following technical scheme:
a cable partial discharge monitoring device for monitoring partial discharge of a cable, comprising: the sampling chip supports four-channel low-speed sampling and supports switching to one-channel high-speed sampling; the filter circuit is electrically connected with the sampling chip and comprises three paths of low-pass filter circuits, one path of high-pass filter circuit and a 50Hz low-pass filter circuit; the three gates are respectively electrically connected with the three low-pass filter circuits, the high-pass filter circuits are electrically connected with the three gates, and the 50Hz low-pass filter circuit is electrically connected with the gate corresponding to the A of the cable; and the three HFCT sensors are electrically connected with the three gates in a one-to-one correspondence manner, and are respectively sleeved on the phase A, the phase B and the phase C of the cable.
Preferably, the signals of the cable phases a, B and C enter the sampling chip through the corresponding HFCT sensor, the gate and the low-pass filter circuit, and the sampling chip synchronously samples the signals of the cable phases a, B and C by using a four-way synchronous sampling technique.
Preferably, the cable signal of phase a or phase B or phase C enters the sampling chip through the corresponding HFCT sensor, the gate and the high-pass filter circuit, and the sampling chip samples the cable signal of phase a or phase B or phase C by using a single-path high-speed sampling technique.
Preferably, the filtering frequency of the low-pass filtering circuit is 500 k-5 MHz; the filtering frequency of the high-pass filtering circuit is 5M-30 MHz.
Preferably, the sampling rate of the high-frequency sampling of the sampling chip is 400 MHz; the sampling rate of the low-frequency synchronous sampling of the sampling chip is 100 MHz.
Preferably, the filter circuit further includes an integrating circuit, the integrating circuit is electrically connected to the gate corresponding to the phase a of the cable, the 50Hz low-pass filter circuit is connected to the integrating circuit, and the sampling chip obtains the 50Hz alternating current signal of the phase a of the cable through the 50Hz low-pass filter circuit and the integrating circuit.
The invention also provides a cable partial discharge monitoring method, which comprises the cable partial discharge monitoring equipment and comprises the following steps:
the first step is as follows: connecting three HFCT sensors with the A phase, the B phase and the C phase of the cable respectively;
the second step is that: the three low-pass filter circuits are used for synchronously sampling signals of the phase A, the phase B and the phase C of the cable at low frequency;
the third step: calculating the average value of the sampling data of the signals of the A phase, the B phase and the C phase of the cable, respectively comparing the average value with the sampling data of the signals of the A phase, the B phase and the C phase of the cable, and respectively obtaining an A average difference value, a B average difference value and a C average difference value;
the fourth step: judging whether the average difference value A, the average difference value B and the average difference value C are higher than a standard value, if so, switching a gate corresponding to the average difference value higher than the standard value into a high-pass filter circuit, carrying out high-frequency sampling on the high-pass filter circuit, and calculating a high-frequency signal component;
the fifth step: and judging whether the high-frequency signal component and the average difference value are both higher than a standard value, if so, judging that the signal is a partial discharge signal.
Preferably, when the sampling chip is used for synchronous sampling, one channel acquires a 50Hz alternating current signal of the phase A of the cable; and the other three channels perform synchronous low-frequency sampling on the A phase, the B phase and the C phase of the cable, calculate corresponding partial discharge amount, perform periodic alignment with an alternating current signal of 50Hz, and draw a phase-discharge amount map.
Preferably, according to the principle of alternating current phase alignment, multiple discharge signals of each phase are recorded, and partial discharge is plotted
And (4) mapping.
Compared with the prior art, the invention has the beneficial effects that:
according to the technical scheme, the cable partial discharge monitoring device comprises a high-pass filter circuit and three low-pass filter circuits through a sampling chip, the three gates are respectively connected with the three low-pass filter circuits in a one-to-one correspondence mode, the high-pass filter circuits are electrically connected with the three gates, the three HFCT sensors are respectively connected with the three gates in a one-to-one correspondence mode, and the three HFCT sensors are respectively connected with an A phase, a B phase and a C phase of a cable. The three low-pass filter circuits can sample the A phase, the B phase and the C phase of the cable at the same low frequency, judge whether the mean deviation value of one phase or a plurality of phases of the A phase, the B phase and the C phase is higher than a standard value, if so, cut the corresponding gating device into the high-pass filter circuit, carry out high-frequency sampling on the high-pass filter circuit, calculate a high-frequency signal component, and judge whether the high-frequency signal component is higher than the standard value. The cable partial discharge monitoring equipment can eliminate interference signals through double analysis, can realize synchronous sampling of the A phase, the B phase and the C phase and high-frequency sampling of one phase, and has a good sampling effect.
Drawings
Fig. 1 is a schematic diagram of a cable partial discharge monitoring device according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of the original signal of the cable.
Fig. 3 is a schematic diagram of a low frequency signal.
Fig. 4 is a schematic diagram of a high frequency signal.
Fig. 5 is a schematic diagram of the integrated signal.
Fig. 6 is a schematic diagram of a 50hz phase signal.
Fig. 7 is a schematic diagram of an integration circuit.
Fig. 8 is a schematic diagram of a low pass filter circuit.
Fig. 9 is a schematic diagram of a high pass filter circuit.
1. A cable; 2. sampling a chip; 3. a gate; 4. an HFCT sensor; 51. a low-pass filter circuit; 52. a high-pass filter circuit; 53. an integrating circuit; 54. a 50Hz low pass filter circuit.
Detailed Description
The present invention will now be described in more detail with reference to the accompanying drawings, in which the description of the invention is given by way of illustration and not of limitation. The various embodiments may be combined with each other to form other embodiments not shown in the following description.
Referring to fig. 1, an embodiment of the present invention provides a cable partial discharge monitoring device, including: a sampling chip 2, a gate 3 and an HFCT sensor 4.
The sampling chip 2 supports four-channel low-speed sampling and supports switching to one-channel high-speed sampling; the filter circuit is electrically connected with the sampling chip 2 and comprises three paths of low-pass filter circuits 51, one path of high-pass filter circuit 52 and a 50Hz low-pass filter circuit 54; the number of the gates 3 is three, the three gates 3 are respectively and electrically connected with the three low-pass filter circuits 51, the high-pass filter circuit 52 is electrically connected with the three gates 3, and the 50Hz low-pass filter circuit 54 is electrically connected with the gate 3 corresponding to the A of the cable 1; the number of the HFCT sensors 4 is three, the three HFCT sensors are electrically connected with the three gates 3 in a one-to-one correspondence, and the three HFCT sensors 4 are respectively sleeved on the A phase, the B phase and the C phase of the cable 1.
In the preferred embodiment, the sampling chip 2 includes four channels. The sampling chip 2 supports four-channel low-speed sampling and supports switching to one-channel high-speed sampling. Three channels are respectively connected with the three low-pass filter circuits 51 in a one-to-one correspondence manner, and the other channel is connected with the high-pass filter circuit 52 and the 50Hz low-pass filter circuit 54.
The three gates 3 are respectively connected with the three low-pass filter circuits 51 in a one-to-one correspondence manner, the high-pass filter circuit 52 is connected with all the three gates 3, and the 50Hz low-pass filter circuit 54 is connected with the gate 3 corresponding to a of the cable 1.
The four channels all support a 100MHz sampling frequency. One of the channels also supports a 400MHz sampling frequency.
The filtering frequency of the low-pass filtering circuit 51 is 500 k-5M; the filtering frequency of the high-pass filtering circuit 52 is 5M to 30M.
More preferably, three HFCT sensors 4 are connected to the phases a, B, and C of the cable 1, respectively, and three gates 3 are connected to the three HFCT sensors 4 in one-to-one correspondence.
Referring to fig. 2 to 9, since a conventional partial discharge is an accidental phenomenon, the phases a, B and C of the cable 1 do not occur simultaneously, and thus if the sampling chip 2 detects signals of the phases a, B and C of the cable 1 simultaneously, the signals are interference signals. The cable partial discharge monitoring equipment provided by the invention can eliminate the interference signal, and specifically comprises the following steps:
the three channels can synchronously sample the signals of the phase A, the phase B and the phase C of the cable 1 at low frequency through the three low-pass filter circuits 51, calculate the average value of the sampled data of the phase A, the phase B and the phase C of the cable 1 sampled at the same moment, compare the average value with the sampled data of the phase A, the phase B and the phase C of the cable 1 respectively, and obtain the average difference value A, the average difference value B and the average difference value C respectively. And comparing the average difference value A, the average difference value B and the average difference value C with a standard value, and if the average difference value A, the average difference value B or the average difference value C is higher than the standard value, the signal of the phase A, the phase B or the phase C corresponding to the average difference value is a high-frequency signal.
Then, the gate 3 corresponding to the a phase, the B phase or the C phase having the average difference value higher than the standard value is switched into the high-pass filter circuit 52, the high-pass filter circuit 52 performs high-frequency sampling, calculates a high-frequency signal component, and compares the high-frequency signal component with the corresponding standard value. If the average difference value a or the average difference value B or the average difference value C is higher than the corresponding standard value, and the high-frequency signal component obtained by performing high-frequency sampling by the high-pass filter circuit 52 and calculating is also higher than the corresponding standard value, it can be determined that the signal is a partial discharge signal. If the two conditions are only satisfied with one or not, the signal can be judged not to be the partial discharge signal but to be the interference signal, and the elimination of the interference signal is realized. Therefore, the cable partial discharge monitoring equipment provided by the invention can accurately monitor the partial discharge signal of the cable 1 and eliminate the interference signal, and has a good monitoring effect.
In a preferred embodiment, the filter circuit further comprises an integrating circuit 53, the integrating circuit 53 is connected to the gate 3 corresponding to a of the cable 1, and the 50Hz low pass filter circuit 54 is connected to the integrating circuit 53. The sampling chip 2 performs low-frequency sampling on the phase a, the phase B and the phase C of the cable 1 through the three low-pass filter circuits 51, performs high-frequency sampling on one phase of the cable 1 through the high-pass filter circuit 52, and obtains a 50Hz alternating current signal of the phase a of the cable 1 through the 50Hz low-pass filter circuit 54 and the integrating circuit 53.
The low-pass filter circuit 51 is used for separating the original signal into 500K-5 MHz signals, and the 50Hz low-pass filter circuit 54 is used for separating the integrated signal into 50Hz signals. The high-pass filter circuit 52 is used for separating the original signal into signals of 5M-30 MHz.
The invention also provides a cable partial discharge monitoring method, which comprises the following steps:
the first step is as follows: sleeving three HFCT sensors 4 on the phase A, the phase B and the phase C of the cable 1 respectively;
the second step is that: the three low-pass filter circuits 51 perform synchronous low-frequency sampling on the signals of the phase A, the phase B and the phase C of the cable 1;
the third step: calculating the average value of the sampling data of the signals of the A phase, the B phase and the C phase of the cable 1, respectively comparing the average value with the sampling data of the signals of the A phase, the B phase and the C phase of the cable 1, and respectively obtaining an A average difference value, a B average difference value and a C average difference value;
the fourth step: judging whether the A average difference value, the B average difference value and the C average difference value are higher than a standard value, if so, switching a gating device 3 corresponding to the average difference value higher than the standard value into a high-pass filter circuit 52, carrying out high-frequency sampling on the high-pass filter circuit 52, and calculating a high-frequency signal component;
the fifth step: and judging whether the high-frequency signal component and the average difference value are both higher than a standard value, if so, judging that the signal is a partial discharge signal.
When the sampling chip 2 is used for synchronous sampling, one channel acquires a 50Hz alternating current signal of the phase A of the cable; and the other three channels perform synchronous low-frequency sampling on the phase A, the phase B and the phase C of the cable 1, calculate corresponding partial discharge amount, perform periodic alignment with an alternating current signal of 50Hz, and draw a phase-discharge amount map.
Recording multiple discharge signals of each phase according to the principle of AC phase alignment, and plotting partial discharges
And (4) mapping.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (9)
1. A cable partial discharge monitoring device for monitoring partial discharges of a cable (1), comprising:
the sampling chip (2) supports four-channel low-speed sampling and supports switching to one-channel high-speed sampling;
the filter circuit is electrically connected with the sampling chip (2) and comprises three paths of low-pass filter circuits (51), one path of high-pass filter circuit (52) and a 50Hz low-pass filter circuit (54);
three gates (3), wherein the three gates (3) are respectively electrically connected with the three low-pass filter circuits (51), the high-pass filter circuit (52) is electrically connected with the three gates (3), and the 50Hz low-pass filter circuit (54) is electrically connected with the gate (3) corresponding to A of the cable (1);
the three HFCT sensors (4) are electrically connected with the three gates (3) in a one-to-one correspondence manner, and the three HFCT sensors (4) are respectively sleeved on the phase A, the phase B and the phase C of the cable (1).
2. The cable partial discharge monitoring device according to claim 1, wherein the signals of the cable (1) phase a, phase B and phase C enter the sampling chip (2) through the corresponding HFCT sensor (4), the gate (3) and the low-pass filter circuit (51), and the sampling chip (2) synchronously samples the signals of the cable (1) phase a, phase B and phase C by using a four-way synchronous sampling technique.
3. The cable partial discharge monitoring device according to claim 1, wherein the cable (1) signal of phase a or phase B or phase C enters the sampling chip (2) through the corresponding HFCT sensor (4), the gate (3) and the high-pass filter circuit (52), and the sampling chip (2) samples the cable (1) signal of phase a or phase B or phase C by using a one-way high-speed sampling technique.
4. The cable partial discharge monitoring device according to claim 1, characterized in that the low-pass filter circuit (51) has a filter frequency of 500 k-5 MHz; the filtering frequency of the high-pass filtering circuit (52) is 5M-30 MHz.
5. The cable partial discharge monitoring device according to claim 1, characterized in that the sampling rate of the high frequency sampling of the sampling chip (2) is 400 MHz; the sampling rate of the low-frequency synchronous sampling of the sampling chip (2) is 100 MHz.
6. The cable partial discharge monitoring device according to claim 1, wherein the filter circuit further comprises an integration circuit (53), the integration circuit (53) is electrically connected to the gate (3) corresponding to a of the cable (1), the 50Hz low-pass filter circuit (54) is connected to the integration circuit (53), and the sampling chip (2) obtains a 50Hz alternating current signal of a phase of the cable (1) through the 50Hz low-pass filter circuit (54) and the integration circuit (53).
7. A cable partial discharge monitoring method comprising the cable partial discharge monitoring device according to any one of claims 1 to 6, and comprising the steps of:
the first step is as follows: sleeving three HFCT sensors (4) on an A phase, a B phase and a C phase of the cable (1) respectively;
the second step is that: the three low-pass filter circuits (51) perform synchronous low-frequency sampling on signals of an A phase, a B phase and a C phase of the cable (1);
the third step: calculating the average value of the sampling data of the signals of the A phase, the B phase and the C phase of the cable (1), respectively comparing the average value with the sampling data of the signals of the A phase, the B phase and the C phase of the cable (1), and respectively obtaining an A average difference value, a B average difference value and a C average difference value;
the fourth step: judging whether the average difference value A, the average difference value B and the average difference value C are higher than a standard value, if so, switching a gating device (3) corresponding to the average difference value higher than the standard value into a high-pass filter circuit (52), and carrying out high-frequency sampling on the high-pass filter circuit (52) and calculating a high-frequency signal component;
the fifth step: and judging whether the high-frequency signal component and the average difference value are both higher than a standard value, if so, judging that the signal is a partial discharge signal.
8. The cable partial discharge monitoring method according to claim 7, wherein when the sampling chip (2) performs synchronous sampling, one channel obtains a phase a 50Hz alternating current signal of the cable (1); and the other three channels perform synchronous low-frequency sampling on the phase A, the phase B and the phase C of the cable (1), calculate corresponding partial discharge amount, perform periodic alignment with an alternating current signal of 50Hz, and draw a phase-discharge amount map.
9. The cable partial discharge monitoring method of claim 8, wherein multiple discharge signals for each phase are recorded and partial discharges are plotted according to the ac phase alignment principle
And (4) mapping.
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