CN216771825U - Arrester resistive current detection device - Google Patents
Arrester resistive current detection device Download PDFInfo
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- CN216771825U CN216771825U CN202122861368.5U CN202122861368U CN216771825U CN 216771825 U CN216771825 U CN 216771825U CN 202122861368 U CN202122861368 U CN 202122861368U CN 216771825 U CN216771825 U CN 216771825U
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Abstract
The utility model belongs to the technical field of lightning arrester state detection, and particularly relates to a lightning arrester resistive current detection device; the technical scheme is as follows: the lightning arrester unit A comprises a lightning arrester body, a lightning arrester base is arranged at the lower end of the lightning arrester body and connected with a ground terminal GND, a monitoring device and a current sensor are connected to a loop of the lightning arrester body, the side A of the current sensor is connected with the monitoring device, the side B of the current sensor is connected to a ground wire, and the side C of the current sensor is connected with a filter; the filter of the arrester unit A is electrically connected with the A-phase resistive current arithmetic unit, the filter of the arrester unit C is electrically connected with the C-phase resistive current arithmetic unit, the filter of the arrester unit B is respectively connected with one side of the A-phase reference voltage phase shifter and one side of the C-phase reference voltage phase shifter, the other side of the A-phase reference voltage phase shifter is connected to the A-phase resistive current arithmetic unit, and the other side of the C-phase reference voltage phase shifter is connected to the C-phase resistive current arithmetic unit.
Description
Technical Field
The utility model belongs to the technical field of lightning arrester state detection, and particularly relates to a lightning arrester resistive current detection device.
Background
The lightning arrester state evaluation is mainly realized by comparing resistive currents of three-phase lightning arresters, and is also a method with high reliability at present. The existing detection device needs to acquire a corresponding reference voltage phase from the secondary side of a voltage transformer connected in parallel except for acquiring the full current, and the component of the full current, which is the same as the voltage phase, is a resistive current.
The method comprises the steps of obtaining reference voltage, and testing the stability and credibility of the reference voltage and a resistive current result, but has the risks of complex wiring and tripping of a power grid caused by secondary wiring short circuit easily caused by the fact that the reference voltage of a voltage transformer is accessed; therefore, aiming at the defects of the existing testing method, the resistive current detection device under the operating voltage of the zinc oxide arrester is researched.
SUMMERY OF THE UTILITY MODEL
The utility model overcomes the defects in the prior art and provides a lightning arrester resistive current detection device.
In order to solve the technical problems, the utility model adopts the technical scheme that: the testing device is safe, reliable and convenient, only needs to collect the full leakage current of the three-phase lightning arrester, can obtain the same effect as the existing resistive current test through calculation of an arithmetic circuit, abandons the connection of the secondary reference voltage of a voltage transformer, avoids the possibility of power failure caused by artificial wiring to a power grid, and has important significance for state evaluation of the lightning arrester in operation.
A lightning arrester resistive current detection device comprises a lightning arrester unit A, a lightning arrester unit B and a lightning arrester unit C;
the lightning arrester unit A comprises a lightning arrester body, a lightning arrester base is arranged at the lower end of the lightning arrester body and connected with a ground terminal GND, the low-voltage side of the lightning arrester body is insulated from the ground potential through the lightning arrester base, a monitoring device and a current sensor are connected to a loop of the lightning arrester body, the side A of the current sensor is connected with the monitoring device, the side B of the current sensor is connected to a ground wire, the side C of the current sensor is connected with a filter, and the lightning arrester unit B and the lightning arrester unit C are the same as the lightning arrester unit A in structure;
the filter of the arrester unit A is electrically connected with the A-phase resistive current arithmetic unit, the filter of the arrester unit C is electrically connected with the C-phase resistive current arithmetic unit, the filter of the arrester unit B is respectively connected with one side of the A-phase reference voltage phase shifter and one side of the C-phase reference voltage phase shifter, the other side of the A-phase reference voltage phase shifter is connected to the A-phase resistive current arithmetic unit, and the other side of the C-phase reference voltage phase shifter is connected to the C-phase resistive current arithmetic unit.
The lightning arrester comprises a lightning arrester unit A, a lightning arrester unit B and a lightning arrester unit C, and is characterized by further comprising a plurality of operating lines, wherein the plurality of operating lines correspond to the lightning arrester unit A, the lightning arrester unit B and the lightning arrester unit C one to one respectively.
The plurality of operating lines comprise an A-phase operating line, a B-phase operating line and a C-phase operating line, and the A-phase operating line is connected with the high-voltage side of the arrester body of the arrester unit A;
the phase B operating line is connected with the high-voltage side of the arrester body of the arrester unit B;
and the C-phase operating line is connected with the high-voltage side of the arrester body of the arrester unit C.
Compared with the prior art, the utility model has the beneficial effects that:
1. the utility model saves the wiring for PT secondary voltage acquisition and avoids unsafe factors brought to primary equipment by testing the wiring.
2. The method obtains the reference voltage phase and calculates the reference resistive current through the fundamental wave total current, is stable and reliable relative to the resistive current, can completely adapt to the resistive current phase difference of the existing regulation through comparison calculation, and can meet the requirement of performance judgment of the lightning arrester.
Drawings
The utility model is further described below with reference to the accompanying drawings.
FIG. 1 is a schematic structural diagram of the present invention.
In the figure: the lightning arrester comprises a lightning arrester unit A1, a lightning arrester unit B2, a lightning arrester unit C3, a lightning arrester body 4, a lightning arrester base 5, a monitoring device 6, a current sensor 7, a filter 8, an A-phase resistive current arithmetic unit 9, a C-phase resistive current arithmetic unit 10, an A-phase reference voltage phase shifter 11, a C-phase reference voltage phase shifter 12, an A-phase operating line 13, a B-phase operating line 14 and a C-phase operating line 15.
Detailed Description
As shown in the figure, a lightning arrester resistive current detection device comprises a lightning arrester unit A1, a lightning arrester unit B2 and a lightning arrester unit C3;
the lightning arrester unit A1 comprises a lightning arrester body 4, a lightning arrester base 5 is arranged at the lower end of the lightning arrester body 4, the lightning arrester base 5 is connected with a ground end GND, the low-voltage side of the lightning arrester body 4 is insulated from the ground potential through the lightning arrester base 5 so as to be conveniently connected with a monitoring device 6 to monitor the full current of the lightning arrester body in operation, the monitoring device 6 and a current sensor 7 are connected to a loop of the lightning arrester body 4, the side A of the current sensor 7 is connected with the monitoring device 6, the side B of the current sensor 7 is connected to the ground wire, the side C of the current sensor 7 is connected with a filter 8, and the lightning arrester unit B2, the lightning arrester unit C3 and the lightning arrester unit A1 are identical in structure; the current sensors in the arrester unit A1, the arrester unit B2 and the arrester unit C3 can respectively obtain the full current of the three-phase arrester;
the filter of the arrester unit a1 is electrically connected with the a-phase resistive current operator 9, the filter of the arrester unit C3 is electrically connected with the C-phase resistive current operator 10, the filter of the arrester unit B2 is respectively connected with one side of the a-phase reference voltage phase shifter 11 and one side of the C-phase reference voltage phase shifter 12, the other side of the a-phase reference voltage phase shifter 11 is connected to the a-phase resistive current operator 9, and the other side of the C-phase reference voltage phase shifter 12 is connected to the C-phase resistive current operator 10.
Preferably, the lightning arrester further comprises a plurality of operating lines, and the plurality of operating lines correspond to the lightning arrester unit A1, the lightning arrester unit B2 and the lightning arrester unit C3 in a one-to-one manner.
Preferably, the plurality of operation lines include an a-phase operation line 13, a B-phase operation line 14, and a C-phase operation line 15, and the a-phase operation line 13 is connected to the high-voltage side of the arrester body of the arrester unit a 1;
the phase B operating line 14 is connected to the high-voltage side of the arrester body of the arrester unit B2;
the C-phase operating line 15 is connected to the high-voltage side of the arrester body of the arrester unit C3.
Preferably, the arrester unit a1, the arrester unit B2, and the arrester unit C3 are simply referred to as a phase, B phase, and C phase, respectively.
Full current of B phase passing through B phase 50HZThe filter acquires a B-phase full leakage current fundamental wave, inputs the acquired fundamental wave current to the A-phase reference voltage phase shifter 11, shifts the phase by 30 degrees to acquire a relative reference voltage phase of the A-phase, and inputs the signal to the A-phase resistive current arithmetic unit 9; the a-phase total current output from the a-phase current sensor 7 is input to the a-phase resistive current arithmetic unit 9, and orthogonal decomposition calculation is performed to obtain an a-phase reference resistive current based on the B-phase total current as a reference.
Full current of B phase passing through B phase 50HZThe filter acquires the B-phase full leakage current fundamental wave, inputs the acquired fundamental wave current into the C-phase reference voltage phase shifter 12, shifts the phase by-210 degrees to acquire the relative reference voltage phase of the C-phase, and then transmits the phase to the C-phase reference voltage phase shifterThe signal is input to the C-phase resistive current operator 10; the C-phase total current output from the C-phase current sensor is input to the C-phase resistive current arithmetic unit 10, and orthogonal decomposition is performed to obtain a C-phase reference resistive current based on the B-phase total current as a reference.
And finally, judging the running state of the arrester according to the longitudinal variation of the tested A-phase and C-phase reference resistive current and historical data, wherein the specific comparison and judgment standard can still refer to the traditional resistive current test comparison difference standard.
A detection method of a lightning arrester resistive current detection device specifically comprises the following steps:
s1: the current sensors in the arrester unit A1, the arrester unit B2 and the arrester unit C3 respectively obtain the full current of the three-phase operation arrester;
s2: inputting the obtained A, B, C-phase full current into respective filters to obtain A, B, C-phase fundamental wave full current, and extracting the current period effective value of each phase;
s3: selecting a zero crossing point of the B-phase fundamental wave total current from positive to negative as a reference zero position, and calculating to obtain a phase angle of A, C two-phase fundamental wave current at the same time according to the current amplitude and the period effective value of A, C phase at the same time;
s4: respectively inputting the obtained phase angle of the full current of the phase B, namely the phase angle at the zero crossing point moment, into the phase shifter 11 of the reference voltage of the phase A and the phase shifter 12 of the reference voltage of the phase C, taking and storing the phase angle after shifting 30 degrees as the phase of the reference voltage of the phase A, and taking and storing the phase angle after shifting-210 degrees as the phase of the reference voltage of the phase C;
s5: inputting the A, C-phase reference voltage phase obtained in step S4, the A, C two-phase fundamental wave current phase angle at the same time obtained in step S3, and A, C two-phase fundamental wave full current to respective resistive current operators; firstly, the phase difference between the phase angle of A, C two-phase fundamental wave current at the same time and the phase difference of A, C two-phase reference voltage is calculated, and then the A, C-phase fundamental wave full current period effective value is multiplied by the cosine value of the calculated A, C-phase difference to obtain A, C-phase reference resistive current effective value.
The above embodiments are merely illustrative of the principles of the present invention and its effects, and do not limit the present invention. It will be apparent to those skilled in the art that modifications and improvements can be made to the above-described embodiments without departing from the spirit and scope of the utility model. Accordingly, it is intended that all equivalent modifications or changes be made by those skilled in the art without departing from the spirit and technical spirit of the present invention, and be covered by the claims of the present invention.
Claims (3)
1. A resistive current detection device of a lightning arrester is characterized by comprising a lightning arrester unit A (1), a lightning arrester unit B (2) and a lightning arrester unit C (3);
the lightning arrester unit A (1) comprises a lightning arrester body (4), a lightning arrester base (5) is arranged at the lower end of the lightning arrester body (4), the lightning arrester base (5) is connected with a ground terminal GND, the low-voltage side of the lightning arrester body (4) is insulated from the ground potential through the lightning arrester base (5), a monitoring device (6) and a current sensor (7) are connected to a loop of the lightning arrester body (4), the A side of the current sensor (7) is connected with the monitoring device (6), the B side of the current sensor (7) is connected to the ground terminal, a filter (8) is connected to the C side of the current sensor (7), and the structures of the lightning arrester unit B (2) and the lightning arrester unit C (3) are the same as that of the lightning arrester unit A (1);
the filter of the lightning arrester unit A (1) is electrically connected with the A-phase resistive current arithmetic unit (9), the filter of the lightning arrester unit C (3) is electrically connected with the C-phase resistive current arithmetic unit (10), the filter of the lightning arrester unit B (2) is respectively connected with one sides of an A-phase reference voltage phase shifter (11) and a C-phase reference voltage phase shifter (12), the other side of the A-phase reference voltage phase shifter (11) is connected to the A-phase resistive current arithmetic unit (9), and the other side of the C-phase reference voltage phase shifter (12) is connected to the C-phase resistive current arithmetic unit (10).
2. The arrester resistive current detection device according to claim 1, further comprising a plurality of operation lines, wherein the plurality of operation lines are in one-to-one correspondence with the arrester units a (1), B (2), and C (3), respectively.
3. A arrester resistive current detection device according to claim 2, characterized in that the plurality of operation lines include an a-phase operation line (13), a B-phase operation line (14), and a C-phase operation line (15), the a-phase operation line (13) being connected to a high-voltage side of the arrester body of the arrester unit a (1);
the B-phase operating line (14) is connected with the high-voltage side of the lightning arrester body of the lightning arrester unit B (2);
the C-phase operating line (15) is connected with the high-voltage side of the arrester body of the arrester unit C (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122861368.5U CN216771825U (en) | 2021-11-19 | 2021-11-19 | Arrester resistive current detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122861368.5U CN216771825U (en) | 2021-11-19 | 2021-11-19 | Arrester resistive current detection device |
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| Publication Number | Publication Date |
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| CN216771825U true CN216771825U (en) | 2022-06-17 |
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| CN202122861368.5U Active CN216771825U (en) | 2021-11-19 | 2021-11-19 | Arrester resistive current detection device |
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| CN (1) | CN216771825U (en) |
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2021
- 2021-11-19 CN CN202122861368.5U patent/CN216771825U/en active Active
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