Single-ended rotor grounding resistance measuring circuit, measuring method and medium

Abstract

The embodiment of the invention provides a single-ended rotor grounding resistance measuring circuit, a measuring method and a medium, which are used for improving the accuracy of the measured resistance value of the rotor grounding resistance, and the circuit comprises a rotor grounding resistance measuring loop used for measuring the resistance value of the rotor grounding resistance; one end of the rotor grounding resistance measuring loop is connected with the cathode of the excitation winding of the brushless excitation synchronous generator; the other end of the rotor grounding resistance measuring loop is connected with a large shaft of the brushless excitation synchronous generator; one end of the rotor grounding resistor is connected with one point on the excitation winding; and the other end of the rotor grounding resistor is connected with a large shaft of the brushless excitation synchronous generator, so that the rotor grounding resistance is measured through the rotor grounding resistance measuring loop without introducing an additional auxiliary power supply and a signal generator, and the resistance value of the rotor grounding resistor is prevented from swinging along with a low-frequency signal generated by the signal generator; therefore, the measured resistance value is deviated from the actual resistance value, and the reliability of the measurement result is improved.

Description

Technical Field

[0001] The present application relates to the field of electronic technology, and in particular to a single-ended rotor ground resistance measurement circuit, a measurement method and a medium. Background Art

[0002] Currently, in a brushless excitation synchronous generator, the single-ended extraction method of the excitation voltage is usually adopted. At this time, there is a rotor ground resistance that cannot be measured by traditional measurement methods. To measure the rotor ground resistance, a possible implementation is to measure the rotor ground resistance by injecting a signal. However, the measurement method of injecting a signal increases the complexity of measuring the rotor ground resistance and reduces the reliability of the measurement. Therefore, how to improve the reliability of the measurement result of the rotor ground resistance has become a technical problem to be solved currently. Summary of the Invention

[0003] In view of the above problems, the purpose of the present invention is to provide a single-ended rotor ground resistance measurement circuit, a measurement method and a medium to improve the reliability of the measurement result of the rotor ground resistance. The specific solutions are as follows:

[0004] In a first aspect, an embodiment of the present application provides a single-ended rotor ground resistance measurement circuit, and the circuit includes:

[0005] A brushless excitation synchronous generator and a rotor ground resistance measurement circuit; the brushless excitation synchronous generator includes the large shaft of the brushless excitation synchronous generator, the excitation winding of the brushless excitation synchronous generator and the rotor ground resistance; the rotor ground resistance measurement circuit is used to measure the resistance value of the rotor ground resistance;

[0006] One end of the rotor ground resistance measurement circuit is connected to the negative pole of the excitation winding of the brushless excitation synchronous generator;

[0007] The other end of the rotor ground resistance measurement circuit is connected to the large shaft of the brushless excitation synchronous generator;

[0008] One end of the rotor ground resistance is connected to a point on the excitation winding; the other end of the rotor ground resistance is connected to the large shaft of the brushless excitation synchronous generator.

[0009] Optionally, the rotor ground resistance measurement circuit includes:

[0010] A first load, a second load and a load transformation sub-circuit; the load transformation sub-circuit is used to change the load connected in the rotor ground resistance measurement circuit;

[0011] One end of the first load is connected to the negative pole of the excitation winding of the brushless excitation synchronous generator; the other end of the first load is connected to one end of the load transformation sub-circuit;

[0012] The other end of the load conversion sub-circuit is connected to one end of the second load;

[0013] The other end of the second load is connected to the large shaft of the brushless excitation synchronous generator.

[0014] Optionally, the load conversion sub-circuit includes a third load and an electronic switch;

[0015] One end of the electronic switch is connected to the other end of the first load; the other end of the electronic switch is connected to one end of the second load;

[0016] The third load is connected in parallel with the electronic switch.

[0017] Optionally, the electronic switch is a switch controlled by the control unit with a fixed period.

[0018] Optionally, the first load includes at least one resistor.

[0019] Optionally, the second load includes at least one resistor.

[0020] Optionally, the third load includes at least one resistor.

[0021] In a second aspect, an embodiment of the present application provides a method for measuring a single-ended rotor grounding resistance. The method is applied to any of the above single-ended rotor grounding resistance measurement circuits, and the method includes:

[0022] Obtain the voltage drop values of the same load in the rotor grounding resistance measurement loop when different loads are connected;

[0023] Based on the voltage drop values of the same load, determine the resistance value of the rotor grounding resistance.

[0024] Optionally, when the rotor grounding resistance measurement loop includes the rotor grounding resistance and a load conversion loop, and the load conversion loop includes a first state and a second state, the obtaining the voltage drop values of the same load in the rotor grounding resistance measurement loop when different loads are connected includes:

[0025] Obtain the voltage drop values of the same load in the load conversion loop in the first state and the second state respectively.

[0026] In a third aspect, an embodiment of the present application provides a computer-readable storage medium, including computer operation instructions. When the computer operation instructions run on a computer, the computer is caused to execute the method for measuring a single-ended rotor grounding resistance according to any one of the above.

[0027] Compared with the prior art, the present application has the following beneficial effects:

[0028] By connecting one end of the rotor ground resistance measurement circuit to the negative pole of the excitation winding of the brushless excitation synchronous generator, and the other end of the rotor ground resistance measurement circuit to the large shaft of the brushless synchronous excitation engine, with one end of the rotor ground resistance connected to the excitation winding and the other end connected to the large shaft of the brushless synchronous excitation engine, a circuit is formed between the rotor ground resistance measurement circuit and the brushless excitation synchronous generator. Thus, the resistance value of the rotor ground resistance can be measured through the rotor ground resistance measurement circuit without introducing an additional auxiliary power supply and signal generator. This avoids the swing of the resistance value of the rotor ground resistance with the low-frequency signal generated by the signal generator, which may cause the measured resistance value to deviate from the actual value, making the measured resistance value of the rotor ground resistance more accurate, improving the reliability of the measurement result, and reducing the subsequent maintenance difficulty. Description of the Drawings

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0030] Figure 1 Structural schematic diagram of a single-ended rotor ground resistance measurement circuit provided by an embodiment of the present application;

[0031] Figure 2 Structural schematic diagram of another single-ended rotor ground resistance measurement circuit provided by an embodiment of the present application;

[0032] Figure 3 Structural schematic diagram of yet another single-ended rotor ground resistance measurement circuit provided by an embodiment of the present application;

[0033] Figure 4 Structural schematic diagram of yet another single-ended rotor ground resistance measurement circuit provided by an embodiment of the present application;

[0034] Figure 5 Flow schematic diagram of a method for measuring a single-ended rotor ground resistance provided by an embodiment of the present application. Detailed Embodiments

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of them. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present application.

[0036] In the description, claims, and the above-mentioned drawings of this application, the terms "first", "second", "third", "fourth", etc. (if any) are used to distinguish similar objects and do not necessarily describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments described herein can be implemented in an order different from that illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or devices.

[0037] Analysis of the background technology shows that since the measurement method of the injected signal requires additional auxiliary power supplies and signal generators, and precise control is needed to output low-frequency signals into the excitation circuit. If the switching period of the injected low-frequency signal does not avoid the charging and discharging time of the equivalent capacitance between the rotor winding and the ground, the measured insulation resistance value of the rotor winding and the ground offset angle will swing periodically, resulting in the measured insulation resistance value deviating from the actual value. Moreover, since the measurement method of the injected signal requires additional auxiliary power supplies and signal generators, new interference signals are introduced, making the measurement of the rotor ground resistance more complex, increasing the measurement cost and maintenance difficulty, and reducing the reliability of the measurement results. To address the above problems, this application provides a single-ended rotor ground resistance measurement circuit, method, and medium, as follows.

[0038] As Figure 1 shown, an embodiment of this application provides a single-ended rotor ground resistance measurement circuit. The circuit includes: a brushless excitation synchronous generator 101 and a rotor ground resistance measurement circuit 102; the brushless excitation synchronous generator 101 includes the large shaft of the brushless excitation synchronous generator 101, the excitation winding of the brushless excitation synchronous generator 101, and the rotor ground resistance r g ; the rotor ground resistance measurement circuit 102 is used to measure the resistance value of the rotor ground resistance r g ;

[0039] One end of the rotor ground resistance measurement circuit 102 is connected to the negative pole of the excitation winding of the brushless excitation synchronous generator 101;

[0040] The other end of the rotor ground resistance measurement circuit 102 is connected to the large shaft of the brushless excitation synchronous generator 101;

[0041] One end of the rotor ground resistance r g is connected to a point on the excitation winding of the brushless excitation synchronous generator 101; one end of the rotor ground resistance r gThe other end is connected to the large shaft of the brushless excitation synchronous generator 101.

[0042] Specifically, the method in this embodiment is applied to the scenario where a brushless excitation synchronous generator fails. Before the brushless excitation synchronous generator fails, the resistance value of the rotor grounding resistor is infinite. The rotor grounding resistor r g is located inside the brushless excitation synchronous generator 101. One end of the rotor grounding resistor r g can be connected to any point on the excitation winding of the brushless excitation synchronous generator 101 other than the negative pole of the excitation winding. For example, when the potential of the excitation winding is E L , the rotor grounding resistor can be connected to the excitation winding, so that the potential from the positive pole of the excitation winding to the connection point of the rotor grounding resistor is (1 - α)E L , and the potential from the connection point of the grounding resistor to the negative pole of the excitation winding is αE L . Since the potential of the large shaft of the brushless excitation synchronous generator 101 is 0, the large shaft of the brushless excitation synchronous generator 101 is represented by a grounding symbol in the example diagrams of this application.

[0043] By establishing a rotor grounding resistor measurement circuit 102, and connecting one end of the rotor grounding resistor measurement circuit 102 to the negative pole of the excitation winding of the brushless excitation synchronous generator 101, and the other end to the large shaft of the brushless excitation synchronous generator 101, the rotor grounding resistor measurement circuit 102 is connected into the generator, and the rotor grounding resistor r in the brushless excitation synchronous generator 101 is measured through the rotor grounding resistor measurement circuit 102 g 's resistance value, so that the measurement of the rotor grounding resistor can be achieved without the need to additionally increase an auxiliary power supply and a signal generator. Among them, each device in the single - end rotor grounding resistor measurement circuit is connected by external wiring, and the external wiring is a general wiring, such as a wire, etc.

[0044] The rotor grounding resistor measurement circuit 102 specifically accesses different loads through a control circuit, and obtains the voltage drop values of the same load in the rotor grounding resistor measurement circuit 102 when the circuit accesses different loads, so as to calculate the rotor grounding resistor based on the voltage drop values.

[0045] It should be noted that the obtained voltage drop values are specifically the voltage drop values of the same load that is connected both before and after the rotor grounding resistor measurement circuit 102 accesses different loads. For example, when the first - connected load includes load A, load B, and load C, and the second - connected load includes load B and load C, then the voltage drop value of load B or load C can be obtained.

[0046] As Figure 2 shown, in an optional embodiment, the rotor grounding resistor measurement circuit 102 includes:

[0047] A first load 201, a second load 202, and a load conversion sub - circuit 203; the load conversion sub - circuit 203 is used to change the load connected in the rotor ground resistance measurement loop 102.

[0048] One end of the first load 201 is connected to the negative pole of the excitation winding of the brushless excitation synchronous generator 101; the other end of the first load 201 is connected to one end of the load conversion sub - circuit 203.

[0049] The other end of the load conversion sub - circuit 203 is connected to one end of the second load 202.

[0050] The other end of the second load 202 is connected to the large shaft of the brushless excitation synchronous generator 101.

[0051] Specifically, the load conversion sub - circuit 203 has the function of switching the load through which the current in the load conversion sub - circuit 203 flows, so that the load conversion sub - circuit 203 can be switched between a first state and a second state. The first state can be the state in which the load conversion sub - circuit 203 is switched to the state where the load through which the current flows is the maximum load, and the second state can be the state in which the load conversion sub - circuit 203 is switched to the state where the load through which the current flows is the minimum load.

[0052] The load conversion sub - circuit 203 can be implemented by a variety of devices to switch the load through which the current flows. For example, the device for controlling the current direction can be a triode, a thyristor, a switch, etc., which have the function of controlling the conduction or disconnection of the circuit, so as to switch the load through which the current flows by controlling the on - off of the branches in the control loop.

[0053] Specifically, the first load 201 includes at least one resistor and can be composed of one or more resistors. When the first load 201 includes multiple resistors, the multiple resistors can be selected to be connected in series or in parallel based on actual needs to form the first load 201. The second load 202 includes at least one resistor and can be composed of one or more resistors. When the second load 202 includes multiple resistors, the multiple resistors can be selected to be connected in series or in parallel based on actual needs to form the second load 202. In the embodiments of the present application, the first load 201 includes a resistor with a resistance value of R1, and the second load 202 includes a resistor with a resistance value of R k For example, the following description will be continued with this example.

[0054] It should be noted that the structure of the rotor ground resistance measurement loop 101 in this embodiment is only one possible structure among all possible structures of the rotor ground resistance measurement loop 101. For example, the rotor ground resistance measurement loop 101 may also include other loads, etc.

[0055] For ease of understanding, the following takes the load conversion sub - circuit 203 including a switch as an example for illustration:

[0056] The load conversion sub - circuit 203 includes a third load and an electronic switch;

[0057] One end of the electronic switch is connected to the other end of the first load 201; the other end of the electronic switch is connected to one end of the second load 202;

[0058] The third load is in parallel with the electronic switch.

[0059] Specifically, the electronic switch is a switch controlled by the control unit with a fixed period, so that the electronic switch cyclically performs opening and closing actions within the fixed period. The fixed period can be set according to actual needs. For example, it can be switched once every 1 second, switched once every 5 seconds, etc. The third load includes at least one resistor. The third load can be composed of one or more resistors. When the third load includes multiple resistors, multiple resistors can be selected to be connected in series or in parallel based on actual needs to form the third load. In this embodiment, the third load includes a resistor with a resistance value of R2 as an example for subsequent description.

[0060] Taking obtaining the voltage drop value of the second load 202 as an example, when the electronic switch is in the off state, the single - end rotor grounding resistance measurement circuit is as Figure 3 shown Figure 3 where E L is the rotor excitation potential, S1 is the electronic switch, R k is the resistance value of the second load 202, R1 is the resistance value of the first load 201, R2 is the resistance value of the third load, R g is the resistance value of the rotor grounding resistance r g and the negative pole α of the generator excitation winding is grounded through the rotor grounding resistance r g . Since the electronic switch S1 is in the off state, the rotor winding sequentially passes through the rotor grounding resistance r g , the second load 202, the third load and the first load 201 to form a loop. And the single - end rotor grounding resistance measurement circuit generates a current I1 under the action of αE L . The current I1 flows through the first load 201 in the counter - clockwise direction by the rotor grounding resistance r g 20. By detecting, the voltage drop value U1 on the second load 202 when the electronic switch is in the off state is obtained for the excitation winding voltage to ground.

[0061] Based on the resistance value R1 of the first load 201, the resistance value R k of the second load 202, the resistance value R2 of the third load, the resistance value R g of the rotor grounding resistance, and the current I1 generated under the action of αE L , the expression of αE L when the electronic switch S1 is in the off state can be obtained, αE L=I1(R1+R k +R2+R g ).

[0062] When the electronic switch S1 is in the off state, the voltage drop of the second load 202 is U1=I1R k , when the electronic switch is in the off state, αE L The expression of and the voltage drop value U1 of the second load 202 when the electronic switch S1 is in the off state can be obtained. The first expression U1=R k αE L / (R1+R k +R2+R g ).

[0063] When the fixed period is reached, the electronic switch switches from the disconnected state to the connected state. At this time, the single-ended rotor grounding resistance measurement circuit is as follows: Figure 4 As shown, Figure 4 The rotor winding passes through the rotor grounding resistor r g , the second load 202, the electronic switch S1 and the first load 201 to form a loop. The single-ended rotor grounding resistance measurement circuit is at αE L The current I2 is generated by the rotor grounding resistance r g The current flows counterclockwise through the first load 201. The voltage drop value U2 of the excitation winding to ground on the second load 202 is obtained by detection when the electronic switch is in the connected state.

[0064] When the electronic switch S1 is in the connected state, the rotor winding passes through the rotor grounding resistor r g , the second load 202, the electronic switch S1 and the first load 201 to form a loop, so when the electronic switch S1 is in the connected state, αE L The expression is αE L =I2(R1+R k +R g ).

[0065] When the electronic switch S1 is in the connected state, the voltage drop of the second load 202 is U2=I2R k , when the electronic switch is in the connected state, αE L The expression of and the voltage drop value U2 of the second load 202 when the electronic switch S1 is in the connected state can be obtained, and the second expression U2=R k αE L / (R1+R k +R g ).

[0066] The first and second expressions are combined to obtain the resistance value R used to calculate the rotor grounding resistance gThe third expression, and calculate the rotor grounding resistance R through the third expression g of the resistance value, so as to realize the resistance value R of the rotor grounding resistance g measurement.

[0067] The third expression is:

[0068]

[0069] By connecting one end of the rotor grounding resistance measurement circuit to the negative pole of the excitation winding of the brushless excitation synchronous generator, the other end of the rotor grounding resistance measurement circuit to the large shaft of the brushless synchronous excitation engine, one end of the rotor grounding resistance to the excitation winding, and the other end to the large shaft of the brushless synchronous excitation engine, the rotor grounding resistance measurement circuit is connected to the brushless excitation synchronous generator, and the rotor grounding resistance is measured based on the voltage drop value of the same load in the rotor grounding resistance measurement circuit, so that there is no need to introduce additional auxiliary power supplies and signal generators. It avoids the swing of the resistance value of the rotor grounding resistance with the low-frequency signal generated by the signal generator, resulting in the deviation of the measured resistance value from the actual resistance value, making the measured resistance value of the rotor grounding resistance more accurate, improving the reliability of the measurement result, and reducing the subsequent maintenance difficulty.

[0070] Such as Figure 5 shown, the embodiment of the present application also provides a method for measuring a single-ended rotor grounding resistance. This method is applied to any of the above single-ended rotor grounding resistance measurement circuits. The method includes:

[0071] S501: Obtain the voltage drop value of the same load in the rotor grounding resistance measurement circuit when different loads are connected.

[0072] S502: Determine the resistance value of the rotor grounding resistance based on the voltage drop value of the same load.

[0073] In an optional embodiment, the rotor grounding resistance measurement circuit includes: a rotor grounding resistance and a load conversion circuit; the load conversion circuit includes a first state and a second state; obtaining the voltage drop value of the same load in the rotor grounding resistance measurement circuit when different loads are connected includes:

[0074] Obtain the voltage drop values of the same load in the load conversion circuit in the first state and the second state respectively.

[0075] In an alternative embodiment, the load conversion circuit includes: a first load, a second load, and a load conversion sub-circuit; the load conversion sub-circuit is configured to change the load connected in the rotor grounding resistance measurement circuit; one end of the first load is connected to the negative pole of the excitation winding of the brushless excitation synchronous generator; the other end of the first load is connected to one end of the load conversion sub-circuit; the other end of the load conversion sub-circuit is connected to one end of the second load; the other end of the second load is connected to the large shaft of the brushless excitation synchronous generator; the load conversion sub-circuit includes a third load and an electronic switch; one end of the electronic switch is connected to the other end of the first load; the other end of the electronic switch is connected to one end of the second load; the third load is connected in parallel with the electronic switch; the electronic switch is a switch controlled by the control unit with a fixed period; determining the value of the rotor grounding resistance based on the voltage drop value of the same load includes:

[0076] Determining the value of the rotor grounding resistance based on the third expression.

[0077] The third expression is wherein, R k is the resistance value of the second load, R1 is the resistance value of the first load, R2 is the resistance value of the third load, R g is the resistance value of the rotor grounding resistance, U1 is the voltage drop value on the second load when the electronic switch is in the off state, and U2 is the voltage drop value on the second load when the electronic switch is in the connected state.

[0078] By connecting one end of the rotor grounding resistance measurement circuit to the negative pole of the excitation winding of the brushless excitation synchronous generator, the other end of the rotor grounding resistance measurement circuit to the large shaft of the brushless synchronous excitation engine, one end of the rotor grounding resistance to the excitation winding, and the other end to the large shaft of the brushless synchronous excitation engine, the rotor grounding resistance measurement circuit is connected to the brushless excitation synchronous generator, so as to measure the rotor grounding resistance based on the voltage drop value of the same load in the rotor grounding resistance measurement circuit, thereby eliminating the need to introduce an additional auxiliary power supply and signal generator. This avoids the swing of the resistance value of the rotor grounding resistance with the low-frequency signal generated by the signal generator, which may cause the measured resistance value to deviate from the actual value, making the measured resistance value of the rotor grounding resistance more accurate, improving the reliability of the measurement result, and reducing the subsequent maintenance difficulty.

[0079] The embodiment of the present application further provides an electronic device, which includes any one of the above single-ended rotor grounding resistance measurement circuits.

[0080] The embodiment of the present application further provides a computer-readable storage medium, including computer operation instructions, which, when running on a computer, cause the computer to execute the measurement method of any one of the above single-ended rotor grounding resistances.

[0081] Each embodiment in this specification is described in a progressive manner. For the identical or similar parts among the embodiments, reference can be made to each other, and the differences between each embodiment and other embodiments are emphasized. In particular, for the embodiment of the electronic device, since it is basically similar to the circuit embodiment, the description is relatively simple, and reference can be made to the relevant part of the circuit embodiment for the relevant content. The embodiments of the electronic device described above are merely illustrative. The units and modules described as separate components may or may not be physically separated. Additionally, some or all of the units and modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. A person of ordinary skill in the art can understand and implement this without creative work.

[0082] It should be understood that in this application, "at least one (item)" means one or more, and "a plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships can exist. For example, "A and / or B" can represent: only A exists, only B exists, and both A and B exist simultaneously. Here, A and B can be singular or plural. The character " / " generally represents an "or" relationship between the associated objects before and after. "At least one (one) of the following" or its similar expression refers to any combination of these items, including any combination of single item (one) or multiple items (ones). For example, at least one (one) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a, b, and c", where a, b, and c can be single or multiple.

[0083] The above are only the preferred embodiments of this application, and there is no restriction on this application in any form. Although this application has been disclosed above with the preferred embodiments, it is not intended to limit this application. Any person skilled in the art can make many possible changes and modifications to the technical solution of this application, or modify it into an equivalent embodiment with equivalent changes, without departing from the scope of the technical solution of this application. Therefore, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of this application without departing from the content of the technical solution of this application still fall within the scope of the protection of the technical solution of this application.

Claims

1. A single-ended rotor ground resistance measurement circuit, characterized in that, The circuit includes: a brushless excitation synchronous generator and a rotor grounding resistance measurement circuit; the brushless excitation synchronous generator includes the large shaft of the brushless excitation synchronous generator, the excitation winding of the brushless excitation synchronous generator, and the rotor grounding resistance; the rotor grounding resistance measurement circuit is used to measure the resistance value of the rotor grounding resistance; One end of the rotor grounding resistance measurement circuit is connected to the negative pole of the excitation winding of the brushless excitation synchronous generator; The other end of the rotor grounding resistance measurement circuit is connected to the large shaft of the brushless excitation synchronous generator; One end of the rotor grounding resistance is connected to a point on the excitation winding; the other end of the rotor grounding resistance is connected to the large shaft of the brushless excitation synchronous generator.

2. The circuit according to claim 1, characterized in that, The rotor grounding resistance measurement circuit includes: A first load, a second load, and a load transformation sub-circuit; the load transformation sub-circuit is used to change the load connected in the rotor grounding resistance measurement circuit; One end of the first load is connected to the negative pole of the excitation winding of the brushless excitation synchronous generator; the other end of the first load is connected to one end of the load transformation sub-circuit; The other end of the load transformation sub-circuit is connected to one end of the second load; The other end of the second load is connected to the large shaft of the brushless excitation synchronous generator.

3. The circuit according to claim 2, wherein The load transformation sub-circuit includes a third load and an electronic switch; One end of the electronic switch is connected to the other end of the first load; the other end of the electronic switch is connected to one end of the second load; The third load is connected in parallel with the electronic switch.

4. The circuit according to claim 3, characterized in that, The electronic switch is a switch controlled by a control unit with a fixed period.

5. The circuit according to claim 2, wherein The first load includes at least one resistor.

6. The circuit according to claim 2, characterized in that, The second load includes at least one resistor.

7. The circuit according to claim 3, wherein The third load includes at least one resistor.

8. A method for measuring the single-ended rotor grounding resistance, characterized in that, The method is applied to the single-ended rotor grounding resistance measurement circuit described in any one of claims 1-7 above. The method includes: Obtaining the voltage drop value of the same load in the rotor grounding resistance measurement circuit when different loads are connected; Based on the voltage drop value of the same load, determining the resistance value of the rotor grounding resistance.

9. The measuring method according to claim 8, wherein When the rotor grounding resistance measurement circuit includes the rotor grounding resistance and a load transformation circuit, and the load transformation circuit includes a first state and a second state, the obtaining the voltage drop value of the same load in the rotor grounding resistance measurement circuit when different loads are connected includes: Obtaining the voltage drop values of the same load in the first state and the second state of the load transformation circuit respectively.

10. A computer-readable storage medium, characterized in that, Including computer operation instructions, when the computer operation instructions run on a computer, enabling the computer to execute the single-ended rotor grounding resistance measurement method described in any one of claims 8-9.

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