Damping resistance device for circuit breaker filter set test and test method thereof

Abstract

The present application relates to the technical field of power system test equipment, and provides a damping resistance device for circuit breaker filter group test and a test method thereof, the device comprising: a resistance element, comprising a resistance body and a plurality of taps arranged on the resistance body, and by selecting different tap combinations to access a test loop, the resistance element can provide damping resistance values including at least 10Ω, 20Ω and 30Ω; a connecting component electrically connected with the taps, for connecting the resistance element to the test loop with a selected resistance value; an insulation protection assembly, comprising a base and at least one pair of insulators mounted on the base, the resistance element being supported on the insulators, and the insulators being 550kV grade insulators; wherein the lower part of the base is provided with moving wheels and an adjustable fixing component, and the adjustable fixing component is used for fixing the device to the ground. The present application can effectively improve the stability and safety of the test system, and improve the test efficiency.

Description

Technical Field

[0001] This invention relates to the field of power system testing equipment technology, and in particular to a damping resistor device and its testing method for testing circuit breaker filter banks. Background Technology

[0002] The capacitive load switching test of high-voltage AC circuit breakers is a mandatory type test item for high-voltage AC circuit breakers. According to IEC 62271-100 and GB / T 1984 standards, 550kV circuit breakers must complete C1 level (capacitive current switching test) and C2 level (capacitive current switching test with re-breakdown probability) verification. The core technical characteristics of this type of test are: a large number of capacitive current switching cycles (usually hundreds to thousands of times), high probability of reignition and re-breakdown, transient overvoltage amplitude can reach more than 2.5 pu, and oscillation frequency covers the range of hundreds of hertz to thousands of hertz (typically 1~5 kHz).

[0003] In the test circuit of the 550kV high-voltage AC circuit breaker switching filter bank, the system stray inductance, filter bank capacitance, and circuit equivalent resistance constitute a second-order oscillating circuit. At the instant the circuit breaker contacts separate, current interruption or re-breakdown triggers LC oscillation, generating a transient process with high amplitude, high frequency, and slow decay. This transient process simultaneously produces two types of technical hazards: First, transient overvoltages threaten equipment insulation. When the overvoltage amplitude exceeds the insulation withstand level of the filter bank capacitors, reactors, and circuit breaker contacts, it leads to cumulative damage to the solid insulation medium, significantly shortening the service life of the equipment.

[0004] Secondly, high-frequency oscillating current can disrupt system stability. This oscillating current is reverse-coupled to the grid side through the test transformer, causing relay protection malfunctions or system voltage oscillations, leading to test interruptions or even a complete power outage, resulting in significant economic losses and test safety risks.

[0005] Traditional solutions primarily address the aforementioned transient processes by including: (1) Metal oxide arrester (MOA) voltage limiting scheme. This scheme uses the nonlinear volt-ampere characteristics of the arrester to limit the overvoltage amplitude, but it has an inherent limitation: after the arrester operates, it is in a low-resistance conducting state, and its conducting resistance is much smaller than the characteristic impedance of the LC circuit. It has almost no attenuation effect on the high-frequency oscillating current and cannot consume the oscillation energy of the circuit; moreover, the residual voltage level of the arrester (usually about 1.9 pu in a 550kV system) and the current carrying capacity are mutually constrained, and the aging characteristics deteriorate after multiple impacts.

[0006] (2) Fixed resistance damping resistor scheme. Fixed resistance resistors are connected in series in some test circuits to suppress oscillations, but this scheme is not designed for the multi-condition characteristics of the 550kV filter bank test: a single resistance value cannot meet the contradictory requirements of strong damping (large resistance, to quickly suppress the overvoltage of the heavy blow) and weak damping (small resistance, to avoid excessive impact on the test waveform during normal opening and closing); and the fixed resistor does not consider the high frequency characteristics, the winding inductance is large, and it exhibits inductive reactance rather than pure resistive characteristics for kHz-level oscillation current, and the damping effect is seriously reduced.

[0007] (3) Discrete resistor-insulation support structure. Traditional damping resistor devices usually design the resistor body and insulation support separately, requiring temporary insulation platform to be built on site, resulting in long installation period and poor insulation consistency to ground; moreover, the device is fixed and cannot meet the flexible requirements of multi-position switching in the 550kV test hall, resulting in low test efficiency.

[0008] In summary, the traditional approach has the following specific technical problems: First, there is a lack of adaptive resistance adjustment methods for multiple operating conditions in 550kV filter bank tests. Different test stages (pre-breakdown, normal switching, and severe breakdown) and different filter bank configurations (differences in capacitance and inductance values) require different damping strengths, and fixed resistance values ​​or simple grading cannot accurately match them.

[0009] Second, there is a lack of integrated designs for resistor bodies that balance high-voltage insulation with low-inductance, high-frequency characteristics. The 550kV rating requires insulation protection designed for heavy pollution conditions (creepage distances are typically over 10 m), and traditional discrete structures lead to increased resistance wire length and inductance. Currently, there are no clear reports on integrated designs that combine non-inductive wound resistor bodies with 550kV-level insulation protection.

[0010] Third, there is a lack of mobile integrated solutions that can meet the requirements of rapid deployment and reliable fixation at the test site. The 550kV test equipment is large in size and weight, and traditional fixed foundation installation cannot meet the needs of multi-position switching, while simply adding rollers is difficult to meet the requirements of wind resistance (level 12, 34m / s) and anti-overturning.

[0011] Therefore, there is an urgent need for a damping resistor device specifically designed for testing 550kV high-voltage AC circuit breaker switching filter banks. This device should be able to flexibly adjust the damping strength according to the test conditions, possess high voltage level insulation performance and low inductance high-frequency characteristics, and enable rapid movement and reliable fixation at the test site. Summary of the Invention

[0012] The purpose of this invention is to solve at least one technical problem in the background art and to provide a damping resistor device and its testing method for circuit breaker filter bank testing.

[0013] To achieve the above objectives, the present invention provides a damping resistor device for circuit breaker filter bank testing, comprising: A resistive element includes a resistor body and multiple taps disposed on the resistor body. By selecting different combinations of taps to connect to a test circuit, the resistive element can provide damping resistance values ​​of at least 10Ω, 20Ω, and 30Ω. A connecting component, electrically connected to the tap, is used to connect the resistive element to the test circuit with a selected resistance value; An insulating protective assembly includes a base and at least one pair of insulators mounted on the base, wherein the resistive element is supported on the insulators, and the insulators are 550kV class insulators; The base is equipped with casters and an adjustable fixing component at its lower part, which is used to fix the device to the ground.

[0014] According to one aspect of the invention, the resistor body is made of nickel-chromium alloy resistance wire, and the surface of the resistance wire has an insulating layer; the resistance wire is manufactured using a non-inductive double-winding process, comprising two parallel resistance wires wound in opposite directions.

[0015] According to one aspect of the present invention, the plurality of taps includes a first tap, a second tap, a third tap, and a fourth tap, wherein the third tap and the fourth tap are disposed between the first tap and the second tap, and the resistor body forms a 10Ω resistance segment between the first tap and the third tap, between the third tap and the fourth tap, and between the fourth tap and the second tap, such that the total resistance between the first tap and the second tap is 30Ω, the resistance between the first tap and the fourth tap is 20Ω, and the resistance between the third tap and the fourth tap is 10Ω.

[0016] According to one aspect of the present invention, the connecting component includes a first connecting piece, a second connecting piece, a third connecting piece, and a fourth connecting piece respectively connected to the first tap, the second tap, the third tap, and the fourth tap. The connecting pieces are made of copper alloy and have a silver-plated layer on their surface. By connecting the first connecting piece and the third connecting piece to the circuit, or by connecting the third connecting piece and the fourth connecting piece to the circuit, the resistive element provides a damping resistance value of 10Ω. By connecting the first connecting piece and the fourth connecting piece to the circuit, the resistive element provides a damping resistance value of 20Ω. By connecting the first connecting piece and the second connecting piece to the circuit, the resistive element provides a damping resistance value of 30Ω.

[0017] According to one aspect of the invention, the heat capacity of the resistive element is ≥8MJ.

[0018] According to one aspect of the invention, the insulating protection assembly includes four pairs of insulators and an equalizing ring disposed above the resistive element.

[0019] According to one aspect of the invention, the adjustable fixing component is an adjustable hoe, including an adjusting screw and a hoe body, wherein the adjusting screw changes the depth at which the hoe body is inserted into the ground.

[0020] To achieve the above objectives, the present invention also provides a test method for the damping resistor device for circuit breaker filter bank testing, comprising: Select the tap combination based on the required damping resistance value of the test circuit; The corresponding taps are connected to the test circuit via the connecting component; The damping resistor device is connected to the test circuit and put into operation to suppress transient overvoltages and high-frequency oscillating currents generated during the test.

[0021] According to one aspect of the invention, before connecting the damping resistor device to the test circuit, the damping resistor device is moved to a position in the test circuit close to the auxiliary circuit breaker and the test circuit breaker by means of the moving wheel, and the device is fixed to the ground by means of the adjustable fixing component.

[0022] According to one aspect of the invention, during the test, the tap combination is switched according to changes in operating conditions to adjust the value of the connected damping resistor.

[0023] According to the present invention, a damping resistor device for testing 550kV high-voltage AC circuit breaker switching filter banks is provided. Through the selective combination of multiple taps on the resistor body, flexible adjustment of three damping resistance values ​​(10Ω, 20Ω, and 30Ω) is achieved, allowing the same device to adapt to the varying damping strength requirements of different test conditions. The use of non-inductive double-wound nickel-chromium alloy resistance wire ensures that the resistive element exhibits pure resistive characteristics in the high-frequency oscillation band from hundreds to thousands of hertz, effectively attenuating high-frequency oscillation currents. The integrated design of 550kV-grade insulators and equalizing rings meets the requirements for ground insulation and electric field homogenization in ultra-high-voltage tests. The combination of movable wheels and adjustable anchors on the base enables rapid movement and reliable fixation at the test site. This device can effectively suppress transient overvoltages and high-frequency oscillation currents generated during 550kV high-voltage AC circuit breaker switching filter bank tests, improving the stability and safety of the test system while increasing test efficiency. Attached Figure Description

[0024] Figure 1 The schematic representation includes a front view of a damping resistor device for circuit breaker filter bank testing according to an embodiment of the present invention. Figure 2The schematic representation includes a front view of a resistive element in a damping resistor device for circuit breaker filter bank testing according to an embodiment of the present invention. Figure 3 The schematic representation includes a test circuit diagram of a damping resistor device connected to a 550kV high-voltage AC circuit breaker and filter bank for testing according to an embodiment of the present invention. Detailed Implementation

[0025] The invention will now be discussed with reference to exemplary embodiments. It should be understood that the described embodiments are merely intended to enable those skilled in the art to better understand and thus implement the invention, and are not intended to imply any limitation on the scope of the invention.

[0026] As used herein, the term "comprising" and its variations are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "at least partially based on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment".

[0027] Figure 1 The schematic representation includes a front view of a damping resistor device for circuit breaker filter bank testing according to an embodiment of the present invention. Figure 2 The schematic representation includes a front view of a resistive element in a damping resistor device for circuit breaker filter bank testing according to an embodiment of the present invention. Figure 3 The schematic representation includes a test circuit diagram of a damping resistor device connected to a 550kV high-voltage AC circuit breaker switching filter bank, according to one embodiment of the present invention. Figures 1-3 As shown, in this embodiment, the damping resistor device for circuit breaker filter bank testing includes: The resistive element 1 includes a resistor body 2 and multiple taps 3 disposed on the resistor body 2. By selecting different combinations of taps to connect to the test circuit, the resistive element can provide damping resistance values ​​R1 of at least 10Ω, 20Ω and 30Ω. The connecting component 4 is electrically connected to the tap 3 and is used to connect the resistive element 1 to the test circuit with a selected damping resistance value R1. The insulating protection component 5 includes a base 6 and at least one pair of insulators 7 mounted on the base 6. The resistive element 1 is supported on the insulators 7, and the insulators 7 are 550kV class insulators. The base 6 is equipped with casters 8 and adjustable fixing components 9 at its lower part. The adjustable fixing components 9 are used to fix the device to the ground.

[0028] In this embodiment, the damping resistor device of the present invention achieves flexible adjustment of the damping resistance value through the selective combination of multiple taps on the resistor body. This allows the same device to adapt to the different damping strength requirements of different operating conditions in the 550kV high-voltage AC circuit breaker switching filter bank test. When the test circuit experiences large-scale overvoltage and high-frequency oscillations, a larger resistance value can be selected to increase the damping coefficient, quickly dissipate oscillation energy, and suppress the overvoltage amplitude. When the test circuit only requires moderate damping to avoid excessive influence on the test waveform, a smaller resistance value can be selected. The connecting components are electrically connected to the taps, ensuring a reliable electrical connection between the resistor element and the external test circuit, reducing the risk of localized heating due to poor contact. The insulation protection component uses 550kV-grade insulators to support the resistor element, meeting the ground insulation requirements of ultra-high voltage tests and preventing surface discharge or flashover. The casters at the bottom of the base allow the device to be flexibly moved within the test hall to adapt to multi-station test requirements; the adjustable fixing components provide reliable ground fixation after the device is in place, preventing displacement or overturning due to electrodynamic or wind forces during the test, ensuring test safety.

[0029] Furthermore, according to one embodiment of the present invention, the resistor body 2 is made of nickel-chromium alloy resistance wire, and the surface of the resistance wire has an insulating layer; the resistance wire adopts a non-inductive double winding process, including two parallel resistance wires wound in opposite directions.

[0030] In this embodiment, the resistor body is made of nickel-chromium alloy resistance wire. This material has excellent high-temperature resistance and resistance temperature stability, enabling it to maintain stable resistance under short-term high-current impacts and preventing damping characteristic drift due to the heating of the resistance material itself. The insulating layer on the surface of the resistance wire provides inter-turn insulation protection, preventing short circuits or creepage between adjacent resistance wires under high-voltage testing conditions. In the non-inductive double-winding process, the magnetic fields generated by the two parallel and oppositely wound resistance wires cancel each other out, significantly reducing the equivalent inductance of the resistor element. This allows it to exhibit pure resistive characteristics rather than inductive reactance characteristics in the high-frequency oscillation band from hundreds of hertz to thousands of hertz, thereby ensuring effective damping attenuation of high-frequency oscillating currents and avoiding high-frequency energy reflection or resonant amplification caused by inductive effects.

[0031] Furthermore, according to one embodiment of the present invention, the plurality of taps includes a first tap 10, a second tap 11, a third tap 12, and a fourth tap 13. The third tap 12 and the fourth tap 13 are disposed between the first tap 10 and the second tap 11. The resistor body 2 forms a 10Ω resistance segment between the first tap 10 and the third tap 12, between the third tap 12 and the fourth tap 13, and between the fourth tap 13 and the second tap 11, such that the total resistance between the first tap 10 and the second tap 11 is 30Ω, the resistance between the first tap 110 and the fourth tap 13 is 20Ω, and the resistance between the third tap 12 and the fourth tap 13 is 10Ω.

[0032] In this embodiment, through the specific spatial arrangement and segmented resistance design of the first, second, third, and fourth taps, the resistor body is divided into three continuous 10Ω resistance segments, forming a clear 10Ω-10Ω-10Ω series structure. This arrangement ensures that a clear resistance output can be obtained between any adjacent taps or across segments: 10Ω damping can be obtained using the first and third taps, or the third and fourth taps; 20Ω damping can be obtained using the first and fourth taps; and 30Ω damping can be obtained using the first and second taps. The three resistance values ​​share the same resistor body, allowing for rapid switching of test conditions without replacing the resistance element, thus improving test efficiency. Furthermore, since each resistance value originates from the same batch of wound resistance wire, the consistency of resistance deviations and temperature characteristic matching between different ranges are guaranteed.

[0033] Further, according to one embodiment of the present invention, the connecting component 4 includes a first connecting piece 14, a second connecting piece 15, a third connecting piece 16, and a fourth connecting piece 17 respectively connected to the first tap 10, the second tap 11, the third tap 12, and the fourth tap 13. The connecting pieces are made of copper alloy and have a silver-plated layer on their surface. By connecting the first connecting piece 14 and the third connecting piece 16 into the circuit, or by connecting the third connecting piece 16 and the fourth connecting piece 17 into the circuit, the resistive element provides a damping resistance value of 10Ω. By connecting the first connecting piece 14 and the fourth connecting piece 17 into the circuit, the resistive element provides a damping resistance value of 20Ω. By connecting the first connecting piece 14 and the second connecting piece 15 into the circuit, the resistive element provides a damping resistance value of 30Ω.

[0034] In this embodiment, each connecting piece is made of copper alloy, ensuring good conductivity and mechanical strength, capable of withstanding short-term impact currents and electrodynamic forces in the test circuit without deformation or breakage. The silver plating layer on the surface of the connecting pieces reduces the oxide film resistance and shrinkage resistance at the contact interface, keeping the contact resistance at a low level. This reduces Joule heat loss when large currents pass through the connection points, suppresses temperature rise at the connection points, and prevents a vicious cycle caused by overheating leading to further increases in contact resistance. This ensures the connection reliability of the device during long-term, repeated impact tests. The clearly defined connecting piece combination method allows operators to quickly and accurately complete wiring according to test requirements, reducing the risk of incorrect wiring.

[0035] Furthermore, according to one embodiment of the present invention, the heat capacity of the resistive element 1 is ≥8MJ.

[0036] In this embodiment, the heat capacity of the resistive element is not less than 8MJ, enabling it to withstand the energy dissipation of short-term high-current surges during 550kV filter bank testing without thermal damage. This heat capacity is compatible with an intermittent working system of 1 second per cycle, 5-minute intervals, 12 cycles per hour, and 12 hours per day. This ensures that the temperature rise of the resistance wire after a single surge does not exceed the material's allowable limit, and that the temperature recovers to near its initial state through natural heat dissipation during rest intervals. This avoids heat accumulation that could lead to annealing of the resistive material, resistance drift, or aging of the insulation layer, thus ensuring the long-term stable operation of the device under intensive cyclic testing modes.

[0037] Furthermore, according to one embodiment of the present invention, the insulating protection assembly 5 includes four pairs of insulators 7 and an equalizing ring 18 is provided above the resistive element 1.

[0038] In this embodiment, four pairs of 550kV insulators provide sufficient insulation distance to ground and creepage distance for the resistive element, meeting the insulation strength requirements of ultra-high voltage outdoor testing and preventing surface flashover under atmospheric or operational overvoltage. An equalizing ring is located on the outer top of the resistive element 1. Utilizing its large radius of curvature and equipotential effect, it homogenizes the electric field distribution at the end of the resistive element and in the tapped area, reduces the electric field concentration coefficient at high curvature locations, suppresses corona discharge, reduces corona loss, audible noise, and radio interference, protects the surface insulation layer of the resistance wire from ozone and nitrogen oxide corrosion, and extends the service life of the resistive element.

[0039] Furthermore, according to one embodiment of the present invention, the adjustable fixing component 9 is an adjustable hoe, including an adjusting screw 19 and a hoe body 20, wherein the depth of the hoe body 20 inserted into the ground is changed by adjusting the adjusting screw 19.

[0040] In this embodiment, the adjustable spade depth can be adjusted by adjusting the screw, allowing the device to adapt to test sites with varying hardness, such as concrete, asphalt, gravel, or soil. On hard ground, a reduced insertion depth relies on the contact friction between the spade's bottom surface and the ground to provide anti-slip capability; on soft ground, an increased insertion depth utilizes the lateral resistance of the soil to provide anti-overturning moment. This structure transfers the device's gravity load to the foundation, increasing the effective contact area and friction coefficient between the device and the ground. Under conditions of a level 12 wind load or short-circuit electrodynamic impact, it can effectively resist horizontal thrust and overturning moment, preventing the device from tipping over or sliding, thus ensuring the safety of test personnel and equipment.

[0041] Furthermore, according to one embodiment of the present invention, the test method for the damping resistor device used in circuit breaker filter bank testing as described above includes: According to such Figure 3 The required damping resistance value R1 for the test circuit shown is selected from the combination of taps 3; Connect the corresponding tap 3 to the test circuit via the connecting component 4; The damping resistor device is connected to the test circuit and put into operation to form the damping resistance value R1, so as to suppress the transient overvoltage and high-frequency oscillating current generated in the test.

[0042] In this embodiment, the method selects the tap combination based on the actual damping resistance value required by the test circuit. The corresponding taps are connected to the test circuit via connecting components. After the damping resistor device is put into operation, the ohmic characteristics of the resistive element consume the energy of the oscillating current in the circuit and convert it into heat dissipation. Simultaneously, the voltage division effect limits the overvoltage amplitude, damping and attenuating the high-frequency oscillating current, reducing the amplitude and rate of rise of the oscillating current. This method directly links the technical characteristics of the device with the requirements of the test conditions, making the switching of the damping resistor purposeful and targeted, avoiding excessive distortion of the test waveform due to blind operation or overvoltage protection failure due to insufficient damping.

[0043] Furthermore, according to one embodiment of the present invention, before connecting the damping resistor device to the test circuit, the damping resistor device is moved to a position in the test circuit close to the auxiliary circuit breaker (FK) and the test circuit breaker (T0) by means of a moving wheel, and the device is fixed to the ground by means of an adjustable fixing component.

[0044] In this embodiment, before commissioning, the damping resistor device is quickly moved to a designated position in the test circuit near the auxiliary circuit breaker and the test circuit breaker using movable wheels. This shortens the connection length of the high-voltage cable, reduces stray inductance and resistance in the connection circuit, and improves the accuracy and repeatability of the damping effect. After positioning, the device is fixed to the ground using adjustable fixing components, eliminating device displacement caused by electromagnetic force or mechanical vibration during the test. This ensures that the electrical clearance and ground insulation distance of the high-voltage connection point always meet the 550kV safety requirements, avoiding discharge or short-circuit accidents caused by positional deviation.

[0045] Furthermore, according to one embodiment of the present invention, during the test, the tap combination is switched according to the changes in operating conditions to adjust the connected damping resistance value.

[0046] In this embodiment, during the test, the tap combination is switched according to changes in operating conditions to adjust the connected damping resistor value, enabling the same device to dynamically respond to different transient stages during the test process. For example, a larger resistance value is used during the circuit breaker pre-breakdown stage to limit the initial overvoltage; a medium resistance value is used during the normal opening and closing stage to balance damping and waveform fidelity; and a smaller resistance value is switched to quickly attenuate high-frequency oscillation energy when a severe breakdown occurs. This dynamic adjustment capability avoids the rigid application of a single resistance value throughout the entire test process, ensuring that the damping strength and the severity of the transient are matched in real time, thereby improving the overall stability and safety of the test system.

[0047] According to the above-described scheme of the present invention, the present invention provides a damping resistor device for testing 550kV high-voltage AC circuit breaker switching filter banks. Through the selective combination of multiple taps on the resistor body, flexible adjustment of three damping resistance values ​​(10Ω, 20Ω, and 30Ω) is achieved, allowing the same device to adapt to the differentiated damping strength requirements of different test conditions. The use of non-inductive double-wound nickel-chromium alloy resistance wire ensures that the resistive element exhibits pure resistive characteristics in the high-frequency oscillation band from hundreds to thousands of hertz, effectively attenuating high-frequency oscillation currents. The integrated design of 550kV-grade insulators and equalizing rings meets the requirements for ground insulation and electric field homogenization in ultra-high voltage tests. The combination of movable wheels and adjustable anchors on the base enables rapid movement and reliable fixation at the test site. This device can effectively suppress transient overvoltages and high-frequency oscillation currents generated during 550kV high-voltage AC circuit breaker switching filter bank tests, improving the stability and safety of the test system while increasing test efficiency.

[0048] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions disclosed in this application.

[0049] It should be understood that the sequence number of each step in the invention and its embodiments does not absolutely imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

Claims

1. A damping resistor device for testing circuit breaker filter banks, characterized in that, include: A resistive element includes a resistor body and multiple taps disposed on the resistor body. By selecting different combinations of taps to connect to a test circuit, the resistive element can provide damping resistance values ​​of at least 10Ω, 20Ω, and 30Ω. A connecting component, electrically connected to the tap, is used to connect the resistive element to the test circuit with a selected resistance value; An insulating protective assembly includes a base and at least one pair of insulators mounted on the base, wherein the resistive element is supported on the insulators, and the insulators are 550kV class insulators; The base is equipped with casters and an adjustable fixing component at its lower part, which is used to fix the device to the ground.

2. The damping resistor device for circuit breaker filter bank testing according to claim 1, characterized in that, The resistor body is made of nickel-chromium alloy resistance wire, and the surface of the resistance wire has an insulating layer; the resistance wire adopts a non-inductive double winding process, which includes two parallel resistance wires wound in opposite directions.

3. The damping resistor device for circuit breaker filter bank testing according to claim 1, characterized in that, The plurality of taps includes a first tap, a second tap, a third tap, and a fourth tap. The third tap and the fourth tap are disposed between the first tap and the second tap. The resistor body forms 10Ω resistance segments between the first tap and the third tap, between the third tap and the fourth tap, and between the fourth tap and the second tap, respectively, such that the total resistance between the first tap and the second tap is 30Ω, the resistance between the first tap and the fourth tap is 20Ω, and the resistance between the third tap and the fourth tap is 10Ω.

4. The damping resistor device for circuit breaker filter bank testing according to claim 3, characterized in that, The connecting component includes a first connecting piece, a second connecting piece, a third connecting piece, and a fourth connecting piece that are respectively connected to the first tap, the second tap, the third tap, and the fourth tap. The connecting pieces are made of copper alloy and have a silver-plated layer on their surface. By connecting the first connecting piece and the third connecting piece to the circuit, or by connecting the third connecting piece and the fourth connecting piece to the circuit, the resistive element provides a damping resistance value of 10Ω. By connecting the first connecting piece and the fourth connecting piece into the circuit, the resistive element provides a damping resistance value of 20Ω; By connecting the first connecting piece and the second connecting piece into the circuit, the resistive element provides a damping resistance value of 30Ω.

5. The damping resistor device for circuit breaker filter bank testing according to claim 1, characterized in that, The heat capacity of the resistive element is ≥8MJ.

6. The damping resistor device for circuit breaker filter bank testing according to claim 1, characterized in that, The insulation protection assembly includes four pairs of insulators and an equalizing ring is provided above the resistive element.

7. The damping resistor device for circuit breaker filter bank testing according to claim 1, characterized in that, The adjustable fixing component is an adjustable hoe, which includes an adjusting screw and a hoe body. The adjusting screw changes the depth at which the hoe body is inserted into the ground.

8. The test method for the damping resistor device for testing circuit breaker filter banks according to any one of claims 1 to 7, characterized in that, include: Select the tap combination based on the required damping resistance value of the test circuit; The corresponding taps are connected to the test circuit via the connecting component; The damping resistor device is connected to the test circuit and put into operation to suppress transient overvoltages and high-frequency oscillating currents generated during the test.

9. The test method according to claim 8, characterized in that, Before connecting the damping resistor device to the test circuit, the damping resistor device is moved to a position in the test circuit close to the auxiliary circuit breaker and the test circuit breaker by means of the moving wheel, and the device is fixed to the ground by means of the adjustable fixing component.

10. The test method according to claim 8, characterized in that, During the test, the tap combination was switched according to the changes in operating conditions to adjust the value of the connected damping resistor.

Images