Device for measuring interpolar voltage of rotor coil of steam turbine generator

Abstract

The application relates to a steam turbine generator rotor coil interelectrode voltage measuring device comprising a measuring instrument having a first measuring position, a second measuring position and a third measuring position; one end of the first measuring lead is connected with the first measuring position, and the other end of the first measuring lead is connected with the positive end or the negative end of a rotor coil; one end of the second measuring lead is connected with the second measuring position, and the other end of the second measuring lead is connected with the cathode end or the anode end of the rotor coil; and one end of the third measuring lead is connected with the third measuring position, and the other end of the third measuring lead is connected with an interelectrode midpoint between the positive electrode end and the negative electrode end of the rotor coil. According to the measuring device, the measuring leads are respectively connected with the positive electrode end, the negative electrode end and the interpolar midpoint of the rotor coil to form two voltage measuring loops, so that the positive electrode voltage and the negative electrode voltage of the rotor coil can be measured at the same time without manually replacing the measuring wires, the operation is simple and convenient, the measuring accuracy and the measuring efficiency are improved, and the cost is reduced. And the use safety is improved.

Description

Technical Field

[0001] This application relates to the field of steam turbine generator technology, and in particular to a measuring device for the inter-pole voltage of a steam turbine generator rotor coil. Background Technology

[0002] With the development and application of steam turbine generator technology, rotor coil inter-turn short circuit faults are common electrical faults in steam turbine generators and a major threat to the safe operation of the unit. Even minor inter-turn short circuits can lead to increased excitation current, a relative decrease in reactive power, and increased bearing vibration. As the severity of rotor coil inter-turn short circuits increases, it can cause one or even two points of grounding in the rotor coil, resulting in serious accidents such as coil burnout. Therefore, effectively detecting the inter-turn insulation condition of steam turbine generator rotor coils and promptly identifying and eliminating faults is a crucial aspect of generator insulation technical supervision.

[0003] The rotor coil inter-pole voltage balance test is a common method for detecting the inter-turn insulation condition of rotor coils. This test involves applying a certain voltage to the rotor coil and then measuring the voltage and its deviation between the midpoint of the rotor coil and the positive and negative terminals, thus determining the coil insulation condition. Under normal conditions, the rotor coils have good symmetry, and the voltage drop between the midpoint and the positive and negative terminals is the same with minimal deviation. When an inter-turn short circuit fault occurs, the number of effective excitation coils on both rotor coils becomes inconsistent, disrupting the coil symmetry, and the voltage drop between the midpoint and the positive and negative terminals becomes unbalanced. The voltage across the short-circuited electrode coil will be significantly reduced, noticeably lower than the voltage across the normal electrode coil. Therefore, comparing and analyzing the voltage drops of the two electrode coils allows for the determination of the faulty coil location. The inter-pole voltage balance test sensitively reflects whether an inter-turn short circuit fault has occurred in the rotor coil and plays a crucial role in the diagnosis and analysis of rotor coil insulation condition.

[0004] In related technologies, there are no complete sets of dedicated devices for measuring the inter-electrode voltage of turbine generator rotor coils. Instead, measurement tools are often made by technicians based on actual conditions, typically consisting of a flexible metal wire and a voltmeter. During measurement, one probe of the voltmeter is first connected to the metal wire, which is then wrapped with insulating tape. The bent wire is then inserted into the retaining ring on the rotor exciter side to probe the midpoint between the two rotor coils. The other probe is placed against the beginning of the positive coil, and the voltage value is measured. Then, the measuring electrodes are switched, and the voltmeter probe is placed against the beginning of the negative coil to measure its voltage. During inter-electrode voltage measurement, the generator rotor coil is energized, and this process generally requires three technicians. One person holds the metal wire and inserts it into the retaining ring, bringing it to the midpoint of the rotor coil; another person holds the voltmeter and places the other probe against the beginning of the rotor coil; and a third person uses a multimeter to read the data.

[0005] However, the aforementioned manual measurement method requires the operator to hold the measuring probes in contact with the rotor coil for extended periods. Furthermore, changing the measuring electrode coil necessitates changing the probe position, making the measurement operation cumbersome. Additionally, the homemade measuring tools are overly rudimentary; the voltmeter probes have limited length, requiring the operator to reach into the coil end inside the retaining ring to locate the midpoint between the electrodes. Due to the confined measuring space and insufficient lighting, locating the midpoint is difficult, and the operator's hand can easily touch the energized rotor coil, posing a risk of electric shock. Moreover, the small contact area between the metal wire and the midpoint between the electrodes results in unstable contact, causing voltage fluctuations during measurement, leading to inaccurate data and significant measurement errors. Utility Model Content

[0006] Therefore, it is necessary to provide a device for measuring the inter-pole voltage of a turbine generator rotor coil, addressing the problems of cumbersome operation, low safety, and low accuracy associated with manually measuring the inter-pole voltage of the rotor coil.

[0007] A device for measuring the inter-pole voltage of a turbine generator rotor coil, comprising:

[0008] The measuring instrument has a first measuring position, a second measuring position, and a third measuring position;

[0009] The first measuring lead has one end connected to the first measuring position and the other end connected to the positive or negative terminal of the rotor coil.

[0010] The second measuring lead has one end connected to the second measuring position and the other end connected to the negative or positive terminal of the rotor coil.

[0011] The third measuring lead has one end connected to the third measuring position and the other end connected to the midpoint between the positive and negative terminals of the rotor coil.

[0012] In one embodiment, the measuring device further comprises:

[0013] The measuring rod has one end connected to the third measuring lead and the other end having a conductive part connected to the midpoint between the electrodes.

[0014] In one embodiment, the measuring rod has a telescopically adjustable insulating rod, one end of which is connected to the third measuring lead, and the conductive part is mounted on the other end of the insulating rod.

[0015] In one embodiment, the conductive part is a conductive rod, and the top end of the conductive rod has an arc-shaped measuring contact that connects to the midpoint between the poles.

[0016] In one embodiment, the insulating rod has an upper insulating rod, a middle insulating rod, and a lower insulating rod with progressively increasing diameters; the upper insulating rod is connected to the conductive part, the middle insulating rod is sleeved on the outer periphery of the upper insulating rod, the lower insulating rod is sleeved on the outer periphery of the middle insulating rod, and its bottom end is connected to the third measuring lead.

[0017] In one embodiment, the measuring rod has a rubber grip that fits around the bottom periphery of the lower section of the insulating rod, and the outer peripheral surface of the rubber grip is provided with anti-slip texture.

[0018] In one embodiment, the insulating rod has an internal connecting wire that is connected to the conductive part and the third measuring lead respectively. The internal connecting wire passes through the cavity of the insulating rod and is bent or stretched along the axial direction of the cavity.

[0019] In one embodiment, the measuring rod further has an illumination component mounted on the insulating rod, the illumination area of ​​which at least covers the location of the midpoint between the poles.

[0020] In one embodiment, the first measuring position, the second measuring position, and the third measuring position are respectively provided with sockets, and one end of the first measuring lead, the second measuring lead, and the third measuring lead is provided with a plug that is plugged into the socket; the other end of the first measuring lead, the second measuring lead, and the third measuring lead is respectively provided with a clip that is engaged with the positive terminal, the negative terminal, or the midpoint between the poles of the rotor coil.

[0021] In one embodiment, the measuring instrument has at least three different measurement modes and ranges, including an AC voltage range, a DC voltage range, and a millivolt voltage range.

[0022] The aforementioned measuring device forms two voltage measurement circuits by connecting at least three measuring leads to the positive terminal, negative terminal, and midpoint of the rotor coil, respectively. It can simultaneously measure the positive and negative voltages of the rotor coil without requiring manual replacement of the measuring wires or prolonged hand-held operation by the measuring personnel. The measuring device is easy to operate, helps to improve the accuracy and efficiency of the measurement results, and enhances the safety of use. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the device for measuring the voltage between the poles of the rotor coil.

[0024] Figure 2 This is a schematic diagram illustrating the principle of measuring the inter-pole voltage of the rotor coil.

[0025] Figure 3 This is a schematic diagram of the wiring for measuring the voltage between the poles of the rotor coil.

[0026] In the diagram: 10, first measuring lead; 20, second measuring lead; 30, third measuring lead;

[0027] 40. Measuring instrument; 41. Rotary switch; 42. Measuring power supply; 43. Display screen; 44. First measurement position; 45. Second measurement position; 46. Third measurement position;

[0028] 50. Measuring rod; 51. Insulating rod; 511. Upper section insulating rod; 512. Middle section insulating rod; 513. Lower section insulating rod; 52. Internal connecting wire; 53. Rubber grip; 54. Lighting component; 55. Conductive rod;

[0029] 60. Positive coil; 61. Inner slip ring;

[0030] 70. Negative coil; 71. Outer slip ring;

[0031] 80. Inter-electrode connecting wire; 81. Inter-electrode midpoint. Detailed Implementation

[0032] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0033] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0034] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0035] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0036] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0037] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0038] See Figure 1 , Figure 1 A schematic diagram of the structure of a rotor coil inter-pole voltage measuring device according to an embodiment of this application is shown. The rotor coil inter-pole voltage measuring device provided in an embodiment of this application includes: a measuring instrument 40, a first measuring lead 10, a second measuring lead 20 and a third measuring lead 30.

[0039] In one embodiment, the measuring instrument 40 has three independent and high-precision measuring channels, namely the first measuring position 44, the second measuring position 45 and the third measuring position 46, for simultaneously or time-divisionally measuring voltage values ​​at different locations.

[0040] Specifically, one end of the first measuring lead 10 is connected to the first measuring position 44, and the other end is connected to the positive or negative terminal of the rotor coil.

[0041] The second measuring lead 20 is similar to the first measuring lead 10. One end of the second measuring lead 20 is connected to the second measuring position 45, and the other end is connected to the negative or positive terminal of the rotor coil.

[0042] One end of the third measuring lead 30 is connected to the third measuring position 46, and the other end is connected to the midpoint between the positive and negative terminals of the rotor coil to ensure that the voltage change at the midpoint between the terminals can be accurately measured during measurement.

[0043] As described above, the measuring device forms two voltage measurement circuits by connecting at least three measuring leads to the positive terminal, negative terminal, and midpoint of the rotor coil, respectively. It can simultaneously measure the positive and negative voltages of the rotor coil without requiring manual replacement of the measuring wires or prolonged hand-held operation by the measuring personnel. The measuring device is easy to operate, helps to improve the accuracy and efficiency of the measurement results, and enhances the safety of use.

[0044] In the above scheme, the first measuring lead 10, the second measuring lead 20 and the third measuring lead 30 can all be made of copper core insulated wire with high temperature resistance and good insulation performance.

[0045] In one embodiment, the first measuring position 44, the second measuring position 45 and the third measuring position 46 are each provided with a 4mm diameter socket for installing the plug of the corresponding measuring lead.

[0046] Specifically, one end of the first measuring lead 10, the second measuring lead 20, and the third measuring lead 30 is provided with a plug that engages with the socket. The plug is a banana plug with a diameter of 4mm. The engagement of the plug with the socket ensures a secure insertion of the measuring lead and improves measurement accuracy.

[0047] In one embodiment, the other end of the first measuring lead 10 and the second measuring lead 20 are respectively provided with clips that engage with the positive or negative terminal of the rotor coil. These clips are specialized clamps, typically alligator clips with an opening diameter of 30mm, to ensure accurate and stable contact with the terminals.

[0048] Specifically, insert the banana plug of the first measuring lead 10 into the socket of the first measuring position 44 of the measuring instrument 40, and snap the alligator clip onto the positive terminal of the rotor coil, or select the negative terminal as needed. At the same time, insert the banana plug of the second measuring lead 20 into the socket of the second measuring position 45, and snap the alligator clip onto the negative or positive terminal.

[0049] In one embodiment, the measuring instrument 40 has at least three different measurement modes and ranges, and a power-off position. These ranges include an AC voltage range, a DC voltage range, and a millivolt voltage range. By installing a multi-position rotary switch 41 on the measuring instrument 40, switching between different measurement modes and ranges can be achieved to meet measurement needs ranging from standard voltage to minute voltage signals, providing high flexibility and wide applicability.

[0050] Specifically, the instrument is powered off by rotating switch 41 to the off position, and powered on and entered the corresponding measurement mode by rotating it to any position other than the off position. Switching switch 41 to the AC voltage position automatically configures the instrument into AC voltage measurement mode, with a range of 0.1V to 1000V. Similarly, switching switch 41 to the DC voltage position puts the instrument into DC voltage measurement mode, also with a range of 0.1V to 1000V. Rotating switch 41 to the millivolt voltage position allows the instrument to support AC or DC voltage measurements within the range of 0.1mV to 600mV.

[0051] In one embodiment, the measuring power supply 42 of the measuring device is a rechargeable 9V battery, which is connected to the measuring instrument 40 through a power interface to provide a stable operating voltage for the voltage measuring circuit and power the entire instrument system.

[0052] In one embodiment, the measuring device uses a high-definition display screen 43 to display key information such as the current measurement value and gear information in real time, making it easy for users to intuitively read the measurement results.

[0053] Combination Figure 2 As shown, Figure 2 This diagram illustrates the principle of measuring the inter-pole voltage of a rotor coil according to one embodiment of this application. In some embodiments, one end of the positive coil 60 and one end of the negative coil 70 are connected via an inter-pole connecting wire 80. The other end of the positive coil 60 is connected to an inner slip ring 61, and the other end of the negative coil 70 is connected to an outer slip ring 71. A first measuring lead 10 is connected to the inner slip ring 61, a second measuring lead 20 is connected to the outer slip ring 71, and a third measuring lead 30 is connected to the inter-pole midpoint 81, thereby enabling the measurement of the voltage between the positive terminal and the inter-pole midpoint 81 of the rotor coil, as well as the voltage between the negative terminal and the inter-pole midpoint 81.

[0054] Specifically, the display screen 43 can display the voltage value V1 of the positive coil 60, the voltage value V2 of the negative coil 70, and the inter-electrode voltage deviation value S. Among them, the inter-electrode voltage deviation value S is automatically calculated and generated by a built-in algorithm and directly displayed on the display screen 43, so that the measurement personnel can directly read the measurement results and determine whether the inter-electrode voltage of the rotor coil is balanced.

[0055] Specifically, if the voltage difference S between the electrodes is not greater than 3%, the insulation condition of the two poles of the rotor coil is considered good. If the voltage difference S between the electrodes is greater than 3%, the electrode coil with the smaller voltage value is considered to have an inter-turn short circuit fault.

[0056] In one embodiment, the measuring device further includes a measuring rod 50, one end of which is connected to the third measuring lead 30. The other end of the measuring rod 50 has a conductive portion connected to the midpoint between the electrodes.

[0057] In one embodiment, the conductive part is a conductive rod 55, and the top end of the conductive rod 55 has an arc-shaped measuring contact that is connected to the midpoint between the poles.

[0058] Specifically, the conductive rod 55 is made of a highly conductive material to reduce voltage signal loss during transmission. The length and diameter of the conductive rod 55 are designed according to specific measurement requirements to allow the operator to easily contact the measuring probe with the midpoint of the rotor coil.

[0059] In one embodiment, the top of the conductive rod 55 is designed with an arc-shaped measuring contact. The measuring contact is made of the same material as the conductive rod 55, and its surface is smooth and without sharp edges. The arc shape design not only increases the contact area between the contact and the midpoint of the rotor coil, but also allows the contact to better adapt to the curvature changes of the coil surface, thereby achieving a more stable and reliable contact, reducing measurement errors caused by poor contact, and making the measurement data more accurate and reliable.

[0060] In one embodiment, the measuring rod 50 has a telescopically adjustable insulating rod 51, one end of which is connected to the third measuring lead 30, and the conductive part is installed at the other end of the insulating rod 51.

[0061] Specifically, the main body of the measuring rod 50 consists of three insulating rods 51 with progressively increasing diameters: the upper insulating rod 511, the middle insulating rod 512, and the lower insulating rod 513. The insulating rods 51 are entirely made of epoxy resin, a material with excellent insulation properties that effectively isolates high-voltage electric fields and protects personnel from electric shock. This design ensures both insulation performance and ease of adjustment.

[0062] In one embodiment, the upper insulating rod 511 is connected to the conductive part, the middle insulating rod 512 is sleeved on the outer periphery of the upper insulating rod 511, and the lower insulating rod 513 is sleeved on the outer periphery of the middle insulating rod 512, with its bottom end connected to the third measuring lead 30.

[0063] Specifically, the upper insulating rod 511 has the smallest diameter and is located at the very top of the insulating rod 51. The conductive rod 55 is threadedly connected to the upper insulating rod 511 via a threaded connector. The middle insulating rod 512 has a moderate diameter and is fitted onto the outer circumference of the upper insulating rod 511 via matching internal and external threads. The lower insulating rod 513 has the largest diameter and is located at the very bottom of the insulating rod 51. It is fitted onto the outer circumference of the middle insulating rod 512 via matching internal and external threads. The plug at one end of the third measuring lead 30 is inserted into the insertion hole at the bottom end of the lower insulating rod 513, achieving a stable connection between the two.

[0064] More specifically, depending on the size and position of the rotor coil under test, the measuring personnel rotate each section of the insulating rod 51, screwing the upper insulating rod 511 out or in from the middle insulating rod 512, and then the middle insulating rod 512 out or in from the lower insulating rod 513, until the appropriate length is achieved. This telescopic design allows the measuring rod 50 to flexibly adapt to different measuring environments, while preventing personnel from directly inserting their hands into the rotor retaining ring, thus avoiding electric shock and ensuring the safety of the measuring personnel.

[0065] In one embodiment, the insulating rod 51 has an internal connecting wire 52, which is connected to the conductive part and the third measuring lead 30, respectively. The internal connecting wire 52 may be a thin and flexible copper core insulated wire, and is disposed inside the cavity of the insulating rod 51, so that when the insulating rod 51 extends or retracts, the internal connecting wire 52 can be bent or stretched within the cavity, thereby ensuring flexible adjustment of the length of the insulating rod 51 and further improving the applicability of the measuring device.

[0066] In one embodiment, the measuring rod 50 has a rubber grip 53 that is sleeved on the outer periphery of the bottom end of the lower insulating rod 513, and the outer peripheral surface of the rubber grip 53 is provided with anti-slip texture.

[0067] Specifically, the rubber grip 53 is made of highly elastic, wear-resistant rubber material with good insulation properties to ensure stable grip and insulation performance even after prolonged use or in harsh environments. The anti-slip texture can be raised dots, stripes, or a grid pattern to increase the friction between the hand and the rubber grip 53, preventing slippage due to sweaty or wet hands during measurement.

[0068] In one embodiment, the measuring rod 50 also has an illumination component 54 mounted on the insulating rod 51, the illumination area of ​​which at least covers the location of the midpoint between the poles.

[0069] Specifically, an illumination component 54, namely a measuring lamp, is installed on the outer upper part of the lower section of the insulating rod 51, 513. The measuring lamp uses a high-brightness LED bead with a diameter of 5mm as the light source to achieve precise illumination in the narrow area within the retaining ring of the rotor coil, that is, at the midpoint between the poles. This allows the measuring personnel to more accurately position and measure, improving visibility and accuracy during the measurement process.

[0070] Combination Figure 3 As shown, Figure 3 The diagram shows a schematic diagram of the measurement wiring for the inter-pole voltage of the rotor coil in one embodiment of this application. In some embodiments, an inner slip ring 61 is provided at the positive terminal of the rotor coil, and an outer slip ring 71 is provided at the negative terminal of the rotor coil.

[0071] Specifically, the alligator clip of the first measuring lead 10 is fixed to the beginning of the rotor positive coil 60, i.e., the inner slip ring 61 or conductive screw at the positive end, ensuring a tight and secure contact. Next, the alligator clip of the second measuring lead 20 is fixed to the beginning of the rotor negative coil 70, i.e., the outer slip ring 71 or conductive screw at the negative end, again ensuring good contact. Finally, one end of the third measuring lead 30 is inserted into the socket of the third measuring position 46 of the measuring instrument 40, and the other end is connected to the socket at the bottom of the measuring rod 50. Adjust the measuring rod 50 to a suitable length according to the size and layout of the rotor coils, ensuring that the measuring contacts can reach the midpoint between the two rotor coil poles.

[0072] In the specific implementation process, a voltage regulator is used to input a preset 200V AC voltage to the rotor coil to ensure stable voltage without fluctuations. The rotary switch 41 of the measuring instrument 40 is switched to the AC voltage range to ensure the accuracy of the measurement results. Next, the measuring light is turned on to illuminate the internal environment of the rotor so that the measuring personnel can clearly observe it. The measuring rod 50 is inserted into the rotor retaining ring, and the measuring contact of the conductive rod 55 is stably and accurately contacted to the midpoint of the rotor coil. Finally, after the measuring instrument 40 displays a stable value, the inter-electrode voltage deviation value S at the midpoint of the rotor coil is recorded and compared with the preset value to determine whether the inter-electrode voltage of the rotor coil is balanced and whether there is an inter-turn short circuit fault.

[0073] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0074] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A measuring device for the inter-pole voltage of a turbine generator rotor coil, characterized in that, include: The measuring instrument (40) has a first measuring position (44), a second measuring position (45) and a third measuring position (46); The first measuring lead (10) is connected at one end to the first measuring position (44) and at the other end to the positive or negative terminal of the rotor coil. The second measuring lead (20) is connected at one end to the second measuring position (45) and at the other end to the negative or positive terminal of the rotor coil. The third measuring lead (30) is connected at one end to the third measuring position (46) and at the other end to the midpoint between the positive and negative poles of the rotor coil.

2. The measuring device for the inter-pole voltage of the turbine generator rotor coil according to claim 1, characterized in that, The measuring device also has: The measuring rod (50) has one end connected to the third measuring lead (30) and the other end has a conductive part connected to the midpoint between the poles.

3. The measuring device for the inter-pole voltage of the turbine generator rotor coil according to claim 2, characterized in that, The measuring rod (50) has a telescopically adjustable insulating rod (51), one end of which is connected to the third measuring lead (30), and the conductive part is installed at the other end of the insulating rod (51).

4. The measuring device for the inter-pole voltage of the turbine generator rotor coil according to any one of claims 2-3, characterized in that, The conductive part is a conductive rod (55), and the top end of the conductive rod (55) has an arc-shaped measuring contact that is connected to the midpoint between the poles.

5. The measuring device for the inter-pole voltage of the turbine generator rotor coil according to claim 3, characterized in that, The insulating rod (51) has an upper insulating rod (511), a middle insulating rod (512), and a lower insulating rod (513) with progressively increasing diameters; the upper insulating rod (511) is connected to the conductive part, the middle insulating rod (512) is sleeved on the outer periphery of the upper insulating rod (511), and the lower insulating rod (513) is sleeved on the outer periphery of the middle insulating rod (512), with its bottom end connected to the third measuring lead (30).

6. The measuring device for the inter-pole voltage of the turbine generator rotor coil according to claim 5, characterized in that, The measuring rod (50) has a rubber grip (53) that is sleeved on the outer periphery of the bottom end of the lower insulating rod (513), and the outer periphery surface of the rubber grip (53) is provided with anti-slip texture.

7. The measuring device for the inter-pole voltage of the turbine generator rotor coil according to claim 3, characterized in that, The insulating rod (51) has an internal connecting wire (52) that is connected to the conductive part and the third measuring lead (30) respectively. The internal connecting wire (52) is disposed through the cavity of the insulating rod (51) and is bent or stretched along the axial direction of the cavity.

8. The measuring device for the inter-pole voltage of the turbine generator rotor coil according to claim 3, characterized in that, The measuring rod (50) also has an illumination component (54) mounted on the insulating rod (51), the illumination area of ​​which at least covers the position of the midpoint between the poles.

9. The measuring device for the inter-pole voltage of the turbine generator rotor coil according to any one of claims 1-3, characterized in that, The first measuring position (44), the second measuring position (45) and the third measuring position (46) are respectively provided with sockets. One end of the first measuring lead (10), the second measuring lead (20) and the third measuring lead (30) is provided with a plug that is connected to the socket. The other end of the first measuring lead (10), the second measuring lead (20) and the third measuring lead (30) is respectively provided with a clip that is connected to the positive terminal or negative terminal or the midpoint between the poles of the rotor coil.

10. The measuring device for the inter-pole voltage of the turbine generator rotor coil according to any one of claims 1-3, characterized in that, The measuring instrument (40) has at least three different measurement modes and ranges, including AC voltage range, DC voltage range and millivolt voltage range.

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