A ground return transmission voltage measuring device and method for an extra-high voltage reactor

Abstract

The application provides a ground return circuit transmission voltage measuring device and method of extra-high voltage reactor, wherein the device comprises a tested reactor, a pulse signal generator, an oscilloscope, a voltage regulator, a test transformer, a voltage divider, a peak value table and a digital voltmeter; the pulse signal generator is connected with the tested reactor, and the oscilloscope is connected with the tested reactor; the voltage regulator is connected with the test transformer, the test transformer is connected with the voltage divider, the test transformer is connected with the tested reactor, the peak value table is connected with the voltage divider, and the digital voltmeter is connected with the tested reactor. The scheme provided by the application can provide a standard voltage waveform by using the pulse signal generator, the voltage is low, and the reactor product coil and the ground return circuit are not damaged; the lightning and operating overvoltage waveform injection method can output a standard test waveform meeting the national standard requirements for all types of reactor products.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of transformer test, and particularly relates to a ground return circuit transfer voltage measuring device and method for extra-high voltage reactor. BACKGROUND

[0002] The extra-high voltage reactor is one of the key equipment of the power system, and its safe and reliable operation is self-evident for the importance of the power system. During the operation of the reactor, various overvoltages on the line are borne, and the insulation failure caused by electromagnetic transient process is relatively common. The lightning invasion wave generated by lightning strike on the transmission line, the transient overvoltage generated by the operation of the switch, especially the operation of the disconnector in the gas insulated substation, and the electromagnetic pulse generated by the magnetic field activity of the ground in the power grid may invade the reactor, excite the electromagnetic transient process in the reactor, increase the voltage on the ground return circuit potential, and cause damage to the insulation components, overheat points, and generation of characteristic gas and other adverse factors. Therefore, it is of great engineering significance and theoretical depth to study and establish the ability of the ground potential return circuit of the reactor to withstand various overvoltages in operation, analyze the key positions with voltage higher than the design value after the overvoltage wave invades, and optimize these key positions. At present, there is no mature measuring method and test device for such research, so it is necessary to design a measuring method and a measuring device for realizing the measuring method. SUMMARY

[0003] To solve the above technical problems, the present application provides a technical scheme of a ground return circuit transfer voltage measuring device and method for extra-high voltage reactor to solve the above technical problems.

[0004] The first aspect of the present application discloses a ground return circuit transfer voltage measuring device for extra-high voltage reactor, which is used for simulating lightning overvoltage waveform invasion or simulating operation overvoltage waveform invasion, and specifically comprises:

[0005] The test reactor, the pulse signal generator, the oscilloscope, the voltage regulator, the test transformer, the voltage divider, the peak value table and the digital voltmeter;

[0006] The pulse signal generator is connected with the test reactor, and the oscilloscope is connected with the test reactor;

[0007] The voltage regulator is connected with the test transformer, the test transformer is connected with the voltage divider, the test transformer is connected with the test reactor, the peak value table is connected with the voltage divider, and the digital voltmeter is connected with the test reactor.

[0008] Preferably, the pulse signal generator is used for outputting a standard lightning waveform or a standard operation waveform.

[0009] By adjusting the pulse signal generator, the standard lightning waveform or the standard operating waveform is injected into the first end, the clamp lead-out end and the core grounding lead-out end of the test reactor, and the transfer voltage of the lightning overvoltage or the transfer voltage of the operating overvoltage of the test point of the test reactor is measured.

[0010] Preferably, the specific connection mode of the simulation of the power frequency overvoltage waveform invasion includes:

[0011] By adjusting the voltage regulator to change the output voltage of the test transformer, a lower power frequency voltage is applied to the test reactor, and the peak value table measures the applied voltage; the power frequency voltage is sequentially applied to the first end, the clamp lead-out end and the core grounding lead-out end of the test reactor, and the power frequency voltage of the test point of the test reactor is measured by the digital voltmeter.

[0012] The second aspect of the present application discloses a ground return circuit transfer voltage measurement method of an ultra-high voltage reactor, the method is applied to the device, and the method is used for measuring the simulation of lightning overvoltage waveform invasion and the simulation of operating overvoltage waveform invasion;

[0013] The measurement method specifically includes:

[0014] The pulse signal generator is connected with the test reactor, the oscilloscope is connected with the test reactor, the standard lightning waveform or the standard operating waveform output by the pulse signal generator is adjusted, the lightning waveform or the standard operating waveform is injected into the first end, the clamp lead-out end and the core grounding lead-out end of the test reactor, and the transfer voltage of the lightning overvoltage or the transfer voltage of the operating overvoltage of the test point of the test reactor is measured.

[0015] Preferably, the transfer voltage of the lightning overvoltage of the test point of the test reactor includes:

[0016] The transfer voltage of the lightning overvoltage between the magnetic shielding clamp plate and the magnetic shielding plate, the transfer voltage of the lightning overvoltage between the different positions of the core and the clamp, the transfer voltage of the lightning overvoltage between the side column support plate and the clamp, and the transfer voltage of the lightning overvoltage between the different positions of the clamp and the coil.

[0017] Preferably, the transfer voltage of the operating overvoltage of the test point of the test reactor includes:

[0018] The transfer voltage of the operating overvoltage between the magnetic shielding clamp plate and the magnetic shielding plate, the transfer voltage of the operating overvoltage between the different positions of the core and the clamp, the transfer voltage of the operating overvoltage between the side column support plate and the clamp, and the transfer voltage of the operating overvoltage between the different positions of the clamp and the coil.

[0019] Preferably, the method is used for measuring the simulation of the power frequency overvoltage waveform invasion.

[0020] The method specifically comprises:

[0021] The voltage regulator is connected with a test transformer, the test transformer is connected with a voltage divider, the test transformer is connected with the tested electric reactor, a peak value meter is connected with the voltage divider, and a digital voltage meter is connected with the tested electric reactor.

[0022] The output voltage of the test transformer is changed by adjusting the voltage regulator, a lower power frequency voltage is applied to the tested electric reactor, and the applied voltage is measured by the peak value meter; the power frequency voltage is applied to the first end of the tested electric reactor, the lead-out end of the clamp and the lead-out end of the core ground in sequence, and the power frequency voltage of the test point of the tested electric reactor is measured by the digital voltage meter.

[0023] Preferably, the power frequency voltage of the test point of the tested electric reactor comprises:

[0024] The power frequency voltage between the magnetic shielding clamp plate and the magnetic shielding plate, the power frequency voltage between the cores at different positions and the clamps, the power frequency voltage between the side column supporting plate and the clamp and the power frequency voltage between the clamps at different positions and the coils.

[0025] It can be seen that the scheme provided by the present application has the advantages that:

[0026] 1. The design of the ground loop overvoltage measurement method and the measurement device on the extra-high voltage electric reactor is realized and the practicability is verified, and the method can be applied to the ground loop voltage measurement of all extra-high voltage electric reactors.

[0027] 2. The lightning and operating overvoltage waveform injection method provided by the present application adopts a pulse signal generator to provide a standard voltage waveform, and the voltage is low and does not damage the electric reactor product coil and the ground loop.

[0028] 3. The lightning and operating overvoltage waveform injection method provided by the present application adopts a pulse signal generator to adjust the waveform by changing the data such as the capacitance and inductance of the device itself, and the method can output a standard test waveform meeting the national standard requirements for all types of electric reactor products. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the specific embodiments or the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0030] Figure 1 It is a structure diagram of a ground loop transmission voltage measurement device of an extra-high voltage electric reactor according to an embodiment of the present application.

[0031] In the figure, 1 is a test reactor, 2 is a pulse signal generator, 3 is an oscilloscope, 4 is a voltage regulator, 5 is a test transformer, 6 is a voltage divider, 7 is a peak value table, and 8 is a digital voltage table. DETAILED DESCRIPTION

[0032] To make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0033] Embodiment 1:

[0034] The first aspect of the present application discloses a ground return circuit transfer voltage measuring device of an extra-high voltage reactor, specifically as shown in Figure 1 The device includes:

[0035] A test reactor 1, a pulse signal generator 2 and an oscilloscope 3;

[0036] The pulse signal generator 2 is connected with the test reactor 1, and the oscilloscope 3 is connected with the test reactor 1 to perform voltage measurement.

[0037] In some embodiments, the specific connection mode of the simulated lightning overvoltage waveform intrusion includes:

[0038] The pulse signal generator 2 is connected with the test reactor 1, the standard lightning waveform output by the pulse signal generator 2 is adjusted, the lightning waveform is injected into the first end, the clamp lead-out end and the core grounding lead-out end of the test reactor 1, and the transfer voltage of the lightning overvoltage of the key part (i.e. the test point in the present application) of the test reactor 1 is measured.

[0039] In some embodiments, the specific connection mode of the simulated operating overvoltage waveform intrusion includes:

[0040] The pulse signal generator 2 is connected with the test reactor 1, the standard operating waveform output by the pulse signal generator 2 is adjusted, the operating waveform is injected into the first end, the clamp lead-out end and the core grounding lead-out end of the test reactor 1, and the transfer voltage of the operating overvoltage of the key part (i.e. the test point in the present application) of the test reactor 1 is measured.

[0041] In some embodiments, the simulated power frequency overvoltage waveform intrusion, the device further includes:

[0042] The voltage regulator 4, the test transformer 5, the voltage divider 6, the peak table 7 and the digital voltage table 8;

[0043] The voltage regulator 4 is connected with the test transformer 5, the test transformer 5 is connected with the voltage divider 6, the test transformer 5 is connected with the tested electric reactor 1, the peak table 7 is connected with the voltage divider 6, and the digital voltage table 8 is connected with the tested electric reactor 1.

[0044] In some embodiments, the specific connection mode of the simulated power frequency overvoltage waveform invasion includes:

[0045] The output voltage of the test transformer 5 is changed by adjusting the voltage regulator 4, a lower power frequency voltage is applied to the tested electric reactor 1, and the applied voltage is measured by the peak table 7; the power frequency voltage is applied to the first end, the clamp lead-out end and the core grounding lead-out end of the tested electric reactor 1 in turn, and the power frequency voltage of the key parts (i.e. the test points in the application) of the tested electric reactor 1 is measured by the digital voltage table 8.

[0046] Embodiment 2:

[0047] The second aspect of the application discloses a ground return circuit transfer voltage measurement method of an extra-high voltage electric reactor, which is applied to the device in any one of the embodiments, and the method comprises:

[0048] The measurement of the simulated lightning overvoltage waveform invasion and the measurement of the simulated operating overvoltage waveform invasion;

[0049] The specific method of the measurement of the simulated lightning overvoltage waveform invasion includes:

[0050] The pulse signal generator 2 is connected with the tested electric reactor 1, the oscilloscope 3 is connected with the tested electric reactor 1, the standard lightning waveform output by the pulse signal generator 2 is adjusted, the lightning waveform is injected into the first end, the clamp lead-out end and the core grounding lead-out end of the tested electric reactor 1, and the transfer voltage of the lightning overvoltage of the key parts (i.e. the test points in the application) of the tested electric reactor 1 is measured.

[0051] The specific method of the measurement of the simulated operating overvoltage waveform invasion includes:

[0052] The pulse signal generator 2 is connected with the tested electric reactor 1, the oscilloscope 3 is connected with the tested electric reactor 1, the standard operating waveform output by the pulse signal generator 2 is adjusted, the operating waveform is injected into the first end, the clamp lead-out end and the core grounding lead-out end of the tested electric reactor 1, and the transfer voltage of the operating overvoltage of the key parts (i.e. the test points in the application) of the tested electric reactor 1 is measured.

[0053] In some embodiments, the transfer voltage of the lightning overvoltage of the key parts (i.e. the test points in the application) of the subject reactor 1 includes:

[0054] The transfer voltage of the lightning overvoltage between the magnetic shielding clamping plate and the magnetic shielding plate, the transfer voltage of the lightning overvoltage between the different position cores and the clamping pieces, the transfer voltage of the lightning overvoltage between the side column support plates and the clamping pieces, and the transfer voltage of the lightning overvoltage between the different position clamping pieces and the coils.

[0055] In some embodiments, the transfer voltage of the operating overvoltage of the key parts (i.e. the test points in the application) of the subject reactor 1 includes:

[0056] The transfer voltage of the operating overvoltage between the magnetic shielding clamping plate and the magnetic shielding plate, the transfer voltage of the operating overvoltage between the different position cores and the clamping pieces, the transfer voltage of the operating overvoltage between the side column support plates and the clamping pieces, and the transfer voltage of the operating overvoltage between the different position clamping pieces and the coils.

[0057] In some embodiments, the method further includes:

[0058] Measuring the simulated power frequency overvoltage waveform invasion;

[0059] The specific method of the measuring the simulated power frequency overvoltage waveform invasion includes:

[0060] The voltage regulator 4 is connected with the test transformer 5, the test transformer 5 is connected with the voltage divider 6, the test transformer 5 is connected with the subject reactor 1, the peak table 7 is connected with the voltage divider 6, and the digital voltmeter 8 is connected with the subject reactor 1;

[0061] By adjusting the voltage regulator 4 to change the output voltage of the test transformer 5, a lower power frequency voltage is applied to the subject reactor 1, and the peak table 7 measures the applied voltage; the power frequency voltage is applied to the first end of the subject reactor 1, the clamping piece lead-out end and the core grounding lead-out end in turn, and the power frequency voltage of the key parts (i.e. the test points in the application) of the subject reactor 1 is measured by the digital voltmeter 8.

[0062] In some embodiments, the power frequency voltage of the key parts (i.e. the test points in the application) of the subject reactor 1 includes:

[0063] The power frequency voltage between the magnetic shielding clamping plate and the magnetic shielding plate, the power frequency voltage between the different position cores and the clamping pieces, the power frequency voltage between the side column support plates and the clamping pieces, and the power frequency voltage between the different position clamping pieces and the coils.

[0064] In summary, the technical solutions of various aspects of the application have the following advantages compared with the prior art:

[0065] The application provides a ground loop transmission voltage measuring device and method of extra-high voltage reactor,

[0066] 1. The application realizes the design of the ground loop overvoltage measuring method and measuring device on the extra-high voltage reactor and verifies the practicability, and can be applied to all extra-high voltage reactor ground loop voltage measurement.

[0067] 2. The lightning and operating overvoltage waveform injection method provided by the application adopts a pulse signal generator to provide a standard voltage waveform, and the voltage is low and does not damage the reactor product coil and the ground loop.

[0068] 3. The lightning and operating overvoltage waveform injection method provided by the application adopts a pulse signal generator to adjust the waveform by changing the data such as the capacitance and inductance of the device itself, and can output a standard test waveform meeting the national standard requirements for all types of reactor products.

[0069] 4. The device has been applied and popularized in the laboratory, and has been applied to a 750kV voltage grade reactor product, and the insulation structure is optimized according to the measurement results, which has important significance and effect on preventing the occurrence of design defects.

[0070] Please note that the technical features of the above embodiments can be combined arbitrarily, and in order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the description. The above examples only express several embodiments of the application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent. It should be noted that for ordinary skilled in the art, without departing from the concept of the application, a number of modifications and improvements can be made, which are within the scope of the application. Therefore, the scope of the patent of the application should be subject to the appended claims.

Claims

1. A device for measuring the ground loop voltage of an ultra-high voltage reactor, characterized in that, The device is used to simulate lightning overvoltage waveform intrusion or simulate operational overvoltage waveform intrusion. Specifically, the device includes: Test reactor, pulse signal generator, oscilloscope, voltage regulator, test transformer, voltage divider, peak meter and digital voltmeter; The pulse signal generator is connected to the reactor under test, and the oscilloscope is connected to the reactor under test. The voltage regulator is connected to the test transformer, the test transformer is connected to the voltage divider, the test transformer is connected to the reactor under test, the peak meter is connected to the voltage divider, and the digital voltmeter is connected to the reactor under test. The pulse signal generator is used to output a standard lightning waveform or a standard operating waveform. By adjusting the pulse signal generator, the standard lightning waveform or standard operating waveform is injected into the first end, clamp lead-out end and core grounding lead-out end of the reactor under test. The transmitted voltage of the lightning overvoltage or the transmitted voltage of the operating overvoltage at the test point of the reactor under test is measured by the oscilloscope. The device is also used to simulate the intrusion of power frequency overvoltage waveform. By adjusting the voltage regulator to change the output voltage of the test transformer, a lower power frequency voltage is applied to the reactor under test. The peak meter measures the applied voltage on the voltage divider. The power frequency voltage is applied sequentially to the first end, the clamp lead-out end and the core grounding lead-out end of the reactor under test. The power frequency voltage at the test point of the reactor under test is measured by the digital voltmeter.

2. A method for measuring the ground loop transmitted voltage of an ultra-high voltage reactor, characterized in that, The method is applied to the apparatus as described in claim 1, and the method is used to measure the simulated lightning overvoltage waveform intrusion or the simulated operational overvoltage waveform intrusion. The measurement method specifically includes: A pulse signal generator is connected to the reactor under test, and an oscilloscope is also connected to the reactor under test. The pulse signal generator is adjusted to output a standard lightning waveform or a standard operating waveform. The lightning waveform or the standard operating waveform is injected into the first end, clamp lead-out end, and core grounding lead-out end of the reactor under test. The oscilloscope is used to measure the transmitted voltage of the lightning overvoltage or the transmitted voltage of the operating overvoltage at the test point of the reactor under test.

3. The method for measuring the ground loop transmitted voltage of an ultra-high voltage reactor according to claim 2, characterized in that, The transmitted voltage of the lightning overvoltage at the test point of the tested reactor includes: The transmitted voltage of lightning overvoltage between the magnetic shielding plate and the magnetic shielding plate of the reactor under test, the transmitted voltage of lightning overvoltage between the core and the clamp at different positions, the transmitted voltage of lightning overvoltage between the side support plate and the clamp, and the transmitted voltage of lightning overvoltage between the clamp and the coil at different positions.

4. The method for measuring the ground loop transmitted voltage of an ultra-high voltage reactor according to claim 3, characterized in that, The transmitted voltage of the operational overvoltage at the test point of the reactor under test includes: The transmitted voltage of the operating overvoltage between the magnetic shielding clamp and the magnetic shielding plate of the reactor under test, the transmitted voltage of the operating overvoltage between the core and the clamp at different positions, the transmitted voltage of the operating overvoltage between the side support plate and the clamp, and the transmitted voltage of the operating overvoltage between the clamp and the coil at different positions.

5. The method for measuring the ground loop transmitted voltage of an ultra-high voltage reactor according to claim 4, characterized in that, The method is used to measure the intrusion of power frequency overvoltage waveforms; The method specifically includes: The voltage regulator is connected to the test transformer, the test transformer is connected to the voltage divider, the test transformer is connected to the reactor under test, the peak meter is connected to the voltage divider, and the digital voltmeter is connected to the reactor under test. The output voltage of the test transformer is changed by adjusting the voltage regulator, and a lower power frequency voltage is applied to the reactor under test. The peak meter measures the applied voltage of the voltage divider. The power frequency voltage is applied sequentially to the first end, the clamp lead-out end and the core grounding lead-out end of the reactor under test. The power frequency voltage at the test point of the reactor under test is measured by the digital voltmeter.

6. The method for measuring the ground loop transmitted voltage of an ultra-high voltage reactor according to claim 5, characterized in that, The power frequency voltage at the test point of the reactor under test includes: The power frequency voltage between the magnetic shielding plate and the magnetic shielding plate of the reactor under test, the power frequency voltage between the core and the clamp at different positions, the power frequency voltage between the side support plate and the clamp, and the power frequency voltage between the clamp and the coil at different positions.

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