A transformer withstand voltage testing device and method

Abstract

This invention relates to the field of transformer withstand voltage testing technology, specifically disclosing a transformer withstand voltage testing device and method, including: a test transformer and several terminals, all of which are located on the top front side of the test transformer; a first warning light is located on the top left side of the test transformer; and a second warning light is located on the top left side of the test transformer. This device can provide real-time feedback on the voltage applied to the transformer, effectively avoiding insulation damage caused by voltage overshoot and excessively rapid voltage rise, thereby extending the transformer's service life and reducing the risk of safety accidents caused by insulation failure. Simultaneously, this device is equipped with a gas leakage monitoring mechanism, which can monitor for gas leakage in real time, enhancing the accuracy of the test results and significantly reducing the risk of equipment failure and environmental pollution caused by gas leakage, perfectly aligning with the green and sustainable power grid development concept.

Description

Technical Field

[0001] This invention relates to the field of transformer withstand voltage testing technology, specifically to a transformer withstand voltage testing device and a withstand voltage testing method. Background Technology

[0002] In power systems, transformers are key equipment for energy conversion and transmission. The stability and safety of their performance are directly related to the safety and efficiency of the power grid operation. Transformers convert AC power of one voltage level to AC power of another voltage level through the principle of electromagnetic induction. They are widely used in all aspects of power generation, transmission, distribution and consumption. Given the core position of transformers in power systems, the strictness of their quality control is self-evident. Among them, withstand voltage testing, as an important means of evaluating the insulation strength and electrical safety of transformers, is an indispensable link.

[0003] Withstand voltage testing, also known as dielectric strength testing, aims to test the transformer's insulation structure's ability to withstand high voltage by applying a test voltage higher than the transformer's normal operating voltage. This is to prevent faults such as short circuits and breakdowns caused by insulation failure, and to ensure that the transformer can operate stably for a long time in a complex and ever-changing power grid environment. This process is of great significance for discovering potential insulation defects, improving equipment reliability, and ensuring power grid safety.

[0004] In the traditional transformer withstand voltage test process, it mainly relies on the coordinated work of the test console and the test transformer. The test console, as the control center, is responsible for boosting the low voltage signal to a predetermined level and then transmitting it to the test transformer. The test transformer further boosts the voltage to a level sufficient to test the insulation strength of the transformer and finally applies it to the transformer under test. This series of voltage boosting processes requires close cooperation among all links to ensure accurate voltage transmission and stable control.

[0005] However, although traditional withstand voltage testing devices meet basic testing requirements to a certain extent, their limitations cannot be ignored. First, traditional test transformers often lack real-time voltage monitoring functions and cannot provide immediate feedback on the voltage value transmitted to the test transformer. This deficiency may lead to problems such as voltage overshoot and excessively fast voltage rise rate in actual testing, which in turn cause irreversible damage to the transformer insulation, such as insulation breakdown and local overheating. This not only shortens the service life of the equipment but may also cause safety accidents.

[0006] Secondly, for test transformers with gas-filled insulation structures, their sealing performance and the stability of the insulating gas are directly related to the safety and accuracy of the test. Unfortunately, in the existing technology, such transformers often lack an effective gas leakage monitoring mechanism. Since gas leakage is not easy to detect, once the insulating gas leaks, it will not only weaken its insulation performance and increase the risk of equipment failure, but may also cause environmental pollution due to the leaked gas, which violates the concept of green and sustainable development. Summary of the Invention

[0007] The purpose of this invention is to provide a transformer withstand voltage testing device and a withstand voltage testing method to solve the problems in the prior art where transformers are damaged and gas leakage cannot be detected when overvoltage or excessively rapid voltage rise occurs.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a transformer withstand voltage testing device and a withstand voltage testing method, comprising: a test transformer and terminals, wherein the number of terminals is several, and the several terminals are all disposed on the front side of the top of the test transformer; a first warning light is disposed on the left side of the top of the test transformer; a second warning light is disposed on the left side of the top of the test transformer; a voltage monitoring mechanism is disposed on the right side of the top of the test transformer; and a pressure monitoring mechanism is disposed on the left side of the top of the test transformer.

[0009] Preferably, the voltage monitoring mechanism includes: a fast-response voltage detector, which is located on the top right side of the test transformer and electrically connected to a first warning light; one end of a first wire is located on the left side of the fast-response voltage detector; a first insulation box is located on the top right side of the test transformer; several first guide rods are provided, with both ends of the first guide rods located on the upper and lower sides of the inner cavity of the first insulation box; a first connecting seat is located at the middle of the top of the inner cavity of the first insulation box, with the other end of the first wire extending into the inner cavity of the first connecting seat; a first contact is located at the top of the inner cavity of the first connecting seat, with the other end of the first wire electrically connected to the first contact; and a de-energized electromagnet is located at the bottom of the first connecting seat, electrically connected to the fast-response voltage detector.

[0010] Preferably, the voltage monitoring mechanism for forming a circuit connection or disconnection further includes: a second connecting seat, which is slidably and appropriately fitted to the top of the outer wall of the first guide rod, and the position of the second connecting seat corresponds to the position of the first connecting seat; a permanent magnet is disposed at the top of the second connecting seat, and the de-energized electromagnet and the permanent magnet are magnetically attracted to each other; a second contact is disposed at the bottom of the inner cavity of the second connecting seat, and the second contact is in contact with the first contact; one end of the second wire is disposed at the bottom of the second contact, and the other end of the second wire extends out of the inner cavity of the first insulating box and is electrically connected to the terminal block.

[0011] Preferably, a baffle is provided in the middle of the outer wall of the first guide rod, and the baffle is located below the second connecting seat.

[0012] Preferably, the pressure monitoring mechanism is designed to move the lifting plate based on the air pressure inside the test transformer. The mechanism includes: a piston cylinder located on the top left side of the test transformer, with its inner cavity connected to the inner cavity of the test transformer; a second insulation box located on the top left side of the test transformer, positioned above the piston cylinder; two second guide rods, with their upper and lower ends respectively located on the upper and lower sides, left and right ends, of the inner cavity of the second insulation box; a piston slidably fitted into the top of the piston cylinder's inner cavity; the bottom end of a piston rod located at the middle of the piston's top end, with the top end of the piston rod slidably extending into the inner cavity of the second insulation box; and the middle of the bottom end of the lifting plate located at the top of the piston rod, with the lifting plate slidably fitted into the outer wall of the second guide rod.

[0013] Preferably, the pressure monitoring mechanism for adjusting the pressure applied to the lifting plate further includes: a screw, which is screwed to the top center of the second insulating box; a pressing plate located at the bottom center of the screw, which is slidably fitted onto the outer wall of the second guide rod; and two springs, which are respectively sleeved on the outer walls of the two pairs of second guide rods, with the top of the springs engaged with the bottom of the pressing plate and the bottom of the springs engaged with the top of the lifting plate.

[0014] Preferably, a third contact is provided on both the left and right sides of the bottom end of the lifting plate, and the two third contacts are electrically connected. A fourth contact is provided on both the left and right sides of the bottom end of the inner cavity of the second insulation box, and the positions of the third contacts and the fourth contacts correspond to each other. The fourth contact on the right side is electrically connected to the second warning light.

[0015] Preferably, the distance from the bottom of the piston to the bottom of the piston cylinder is greater than the distance from the third contact point to the fourth contact point.

[0016] The transformer withstand voltage testing device and method proposed in this invention have the following advantages:

[0017] 1. This invention utilizes a fast-response voltage detector connected to a test control console and a test transformer connected to the transformer under test. The test control console increases the voltage and transmits it to the fast-response voltage detector, which then transmits it to the test transformer via terminals. The test transformer further increases the voltage and transmits it to the transformer under test, thereby performing a withstand voltage test on the transformer under test.

[0018] 2. This invention utilizes a fast-response voltage detector to monitor the voltage value transmitted by the test control console in real time. When overvoltage or excessively rapid voltage rise occurs, the de-energized electromagnet is energized and loses its magnetism. Under the gravity of the second connector, it drives the second contact to move downward, thereby separating the first and second contacts and causing the circuit to break. The test control console can no longer supply power to the test transformer, thus avoiding irreversible damage to the transformer such as insulation breakdown and local overheating.

[0019] 3. When gas leaks in the inner cavity of the test transformer, the pressure in the inner cavity will decrease. Under the action of the spring force, the lifting plate will be pushed to move the piston rod and piston downward until the third contact and the fourth contact make contact, thereby forming a circuit and causing the second warning light to sound an alarm, reminding the staff to carry out maintenance.

[0020] 4. This device can provide real-time feedback on the voltage applied to the transformer, effectively avoiding insulation damage caused by voltage overshoot and excessively rapid voltage rise, thereby extending the service life of the transformer and reducing the risk of safety accidents caused by insulation failure. At the same time, this device is equipped with a gas leak monitoring mechanism, which can monitor for gas leaks in real time, enhancing the accuracy of test results and significantly reducing the risk of equipment failure and environmental pollution caused by gas leaks, perfectly aligning with the concept of green and sustainable power grid development. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the voltage monitoring mechanism;

[0023] Figure 3 This is a schematic diagram of the pressure monitoring mechanism;

[0024] Figure 4 This is a front sectional view of the voltage detection mechanism;

[0025] Figure 5 This is a front sectional view of the pressure monitoring facility;

[0026] Figure 6 for Figure 1 Enlarged view of point A;

[0027] Figure 7 for Figure 4 Enlarged view of point B;

[0028] Figure 8 for Figure 5 Enlarged view of point C.

[0029] In the diagram: 1. Test transformer; 2. Terminal; 3. First warning light; 4. Second warning light; 5. Voltage monitoring mechanism; 51. Fast response voltage detector; 52. First conductor; 53. First insulation box; 54. First guide rod; 55. First connecting seat; 56. First contact; 57. De-energized electromagnet; 58. Second connecting seat; 59. Permanent magnet; 510. Second conductor; 511. Second contact; 512. Baffle; 6. Pressure monitoring mechanism; 61. Piston cylinder; 62. Second insulation box; 63. Second guide rod; 64. Piston; 65. Piston rod; 66. Lifting plate; 67. Screw; 68. Extrusion plate; 69. Spring; 610. Third contact; 611. Fourth contact. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Please see Figures 1-8 This invention provides a transformer withstand voltage testing device and method, comprising: a test transformer 1, terminals 2, a first warning light 3, a second warning light 4, a voltage monitoring mechanism 5, and a pressure monitoring mechanism 6. The number of terminals 2 is plurality of, all located on the front top of the test transformer 1. The first warning light 3 is located on the left side of the top of the test transformer 1. The first warning light 3 is existing technology; it issues an alarm when the voltage transmitted by the test control console is over-voltage or the voltage rise rate is too fast. The second warning light 4 is located on the left side of the top of the test transformer 1. The second warning light 4 is existing technology; it issues an alarm when the air pressure inside the test transformer 1 drops to a certain level. The voltage monitoring mechanism 5 is located on the right side of the top of the test transformer 1 and is used to monitor the voltage transmitted by the test control console. The pressure monitoring mechanism 6 is located on the left side of the top of the test transformer 1 and is used to monitor the air pressure inside the test transformer 1.

[0032] As a preferred embodiment, the voltage monitoring mechanism 5 further includes: a fast-response voltage detector 51, a first conductor 52, a first insulating box 53, a first guide rod 54, a first connecting seat 55, a first contact 56, a de-energized electromagnet 57, a second connecting seat 58, a permanent magnet 59, a second conductor 510, a second contact 511, and a baffle 512. The fast-response voltage detector 51 is located on the top right side of the test transformer 1. The fast-response voltage detector 51 is electrically connected to the first warning light 3. The fast-response voltage detector 51 is existing technology. The fast-response voltage detector 51 monitors the voltage transmitted from the test control console to the test transformer 1 in real time, and it has extremely high [voltage sensitivity]. The sampling rate and response speed mean it can measure voltage values ​​very frequently. The high sampling rate allows the detector to capture minute voltage changes, including instantaneous voltage spikes, in a very short time. One end of the first conductor 52 is positioned to the left of the fast-response voltage detector 51. The first insulating box 53 is positioned to the right of the top of the test transformer 1. Several first guide rods 54 are present, with their upper and lower ends positioned on the upper and lower sides of the inner cavity of the first insulating box 53. The first connecting seat 55 is positioned at the center of the top of the inner cavity of the first insulating box 53. The other end of the first conductor 52 extends into the inner cavity of the first connecting seat 55. The first contact 5... 6 is located at the top of the inner cavity of the first connecting seat 55. The other end of the first wire 52 is electrically connected to the first contact 56. The de-energized electromagnet 57 is located at the bottom of the first connecting seat 55. The de-energized electromagnet 57 is electrically connected to the fast response voltage detector 51. The de-energized electromagnet 57 is existing technology. It has magnetic force when the power is off, and its magnetic force disappears when it is energized. It will not be described in detail here. The second connecting seat 58 is slidably and appropriately matched to the top of the outer wall of the first guide rod 54. The position of the second connecting seat 58 corresponds to the position of the first connecting seat 55. The permanent magnet 59 is located at the top of the second connecting seat 58. The de-energized electromagnet 57 and the permanent magnet 59 are magnetic. The permanent magnet 59 and the de-energized electromagnet 57 are attracted to each other, which can cause the first contact 56 and the second contact 511 to contact, thereby forming a circuit. The second contact 511 is located at the bottom of the inner cavity of the second connecting seat 58. The second contact 511 and the first contact 56 are in contact. One end of the second wire 510 is located at the bottom of the second contact 511. The other end of the second wire 510 extends out of the inner cavity of the first insulating box 53 and is electrically connected to the terminal 2. The baffle 512 is located in the middle of the outer wall of the first guide rod 54. The baffle 512 is located below the second connecting seat 58 and is used to shield the second connecting seat 58 to prevent the second connecting seat 58 from falling too far.

[0033] Normal test state: When the voltage output by the test console is normal (no overvoltage, and the voltage boost rate meets the requirements), the fast response voltage detector 51 detects that the voltage signal is within the preset normal range. At this time, the fast response voltage detector 51 does not supply power to the de-energized electromagnet 57. The de-energized electromagnet 57 remains de-energized and has magnetism, forming a magnetic attraction with the permanent magnet 59 at the top of the second connector 58. Under the action of the attraction force, the second connector 58 slides upward along the first guide rod 54 until the second contact 511 is in close contact with the first contact 56, and the circuit is in the conducting state.

[0034] At this time, the voltage output by the test console is transmitted sequentially through the fast response voltage detector 51, the first wire 52, the first contact 56, the second contact 511, and the second wire 510 to the terminal 2, and then transmitted by the terminal 2 to the test transformer 1. The test transformer 1 further increases the voltage and applies it to the transformer under test to complete the normal withstand voltage test.

[0035] Voltage anomaly: When an abnormal situation occurs, such as overvoltage or excessively rapid voltage increase, when the voltage transmitted from the test control console to the test transformer 1, the fast-response voltage detector 51 captures the abnormal signal in a very short time and simultaneously performs two operations:

[0036] First, a trigger signal is sent to the first warning light 3, which illuminates the first warning light 3 and issues a voltage abnormality alarm to the staff.

[0037] Second, current is supplied to the de-energized electromagnet 57, so that the de-energized electromagnet 57 is energized, its magnetism disappears rapidly, and its attraction to the permanent magnet 59 is released.

[0038] At this time, the second connecting seat 58 slides down along the first guide rod 54 under its own gravity until its bottom end contacts the baffle 512 and stops falling; as the second connecting seat 58 slides down, the second contact 511 separates from the first contact 56, the circuit is in an open circuit state, and the test control console stops supplying voltage to the test transformer 1, thereby effectively avoiding irreversible damage such as breakdown and local overheating of the transformer insulation layer caused by overvoltage or too fast voltage rise, and ensuring equipment safety.

[0039] As a preferred embodiment, the pressure monitoring mechanism 6 further includes: a piston cylinder 61, a second insulating box 62, a second guide rod 63, a piston 64, a piston rod 65, a lifting plate 66, a screw 67, a pressing plate 68, a spring 69, a third contact 610, and a fourth contact 611. The piston cylinder 61 is located on the top left side of the test transformer 1, and its inner cavity is connected to the inner cavity of the test transformer 1. The second insulating box 62 is located on the top left side of the test transformer 1, above the piston cylinder 61. There are two second guide rods 63. The upper and lower ends are respectively located on the upper and lower sides and left and right ends of the inner cavity of the second insulation box 62. The piston 64 is slidably fitted into the top end of the inner cavity of the piston cylinder 61. The bottom end of the piston rod 65 is located at the middle of the top end of the piston 64, and the top end of the piston rod 65 slidably extends into the inner cavity of the second insulation box 62. The middle of the bottom end of the lifting plate 66 is located at the top end of the piston rod 65, and the lifting plate 66 is slidably fitted into the outer wall of the second guide rod 63. The screw 67 is screwed into the middle of the top end of the second insulation box 62. Rotating the screw 67 can drive the pressing plate 68 to move up and down, thereby adjusting the spring 6 The compression degree is 9. The top center of the compression plate 68 is located at the bottom end of the screw 67. The compression plate 68 is slidably and appropriately matched to the outer wall of the second guide rod 63. There are two springs 69, which are respectively sleeved on the outer walls of the two pairs of second guide rods 63. The top end of the spring 69 is engaged with the bottom end of the compression plate 68, and the bottom end of the spring 69 is engaged with the top end of the lifting plate 66. The spring 69 is a rotary spring, which undergoes elastic deformation after being compressed or stretched by external force, and returns to its initial state after the external force is removed. The spring 69 is used to press down the lifting plate 66. There are two third contact points 610. Two third contacts 610 are respectively located on the left and right sides of the bottom end of the lifting plate 66 and are electrically connected. There are two fourth contacts 611, which are respectively located on the left and right sides of the bottom end of the inner cavity of the second insulation box 62. The positions of the third contacts 610 and the fourth contacts 611 correspond to each other. The fourth contact 611 on the right side is electrically connected to the second warning light 4. The distance from the bottom end of the piston 64 to the bottom end of the inner cavity of the piston cylinder 61 is greater than the distance from the third contact 610 to the fourth contact 611, ensuring that the third contact 610 can contact the fourth contact 611.

[0040] Normal air pressure condition (no gas leakage): When the air pressure inside the test transformer 1 is within the normal range (no gas leakage), the air pressure inside the transformer 1 is transmitted to the inner cavity of the piston cylinder 61 through the connecting channel, generating an upward thrust on the piston 64. This thrust overcomes the downward pressure of the spring 69 on the lifting plate 66, pushing the piston 64 to slide upward along the piston cylinder 61, and then drives the lifting plate 66 to move upward along the second guide rod 63 through the piston rod 65. At this time, the third contact 610 at the bottom of the lifting plate 66 and the fourth contact 611 at the bottom of the inner cavity of the second insulation box 62 remain separated. The circuit of "power supply, third contact 610, fourth contact 611 and second warning light 4" is open, and the second warning light 4 does not activate, indicating that there is no gas leakage in the test transformer 1.

[0041] Gas leakage state (gas pressure reduction): When gas leakage occurs in the inner cavity of the test transformer 1, the gas pressure in its inner cavity gradually decreases, which simultaneously causes the gas pressure in the inner cavity of the piston cylinder 61 to decrease, and the upward thrust on the piston 64 decreases accordingly; when the thrust is less than the downward pressure of the spring 69, the spring 69 releases elastic potential energy, pushing the lifting plate 66 to move downward along the second guide rod 63, and then driving the piston 64 to slide downward along the piston cylinder 61 through the piston rod 65;

[0042] As the lifting plate 66 continues to move downward, when the gas pressure inside the test transformer 1 drops to the preset alarm threshold, the third contact 610 at the bottom of the lifting plate 66 makes full contact with the fourth contact 611 at the bottom of the second insulation box 62, the above circuit is completed, the second warning light 4 is powered on and illuminates, issuing a gas leak alarm to the staff, prompting them to stop the machine for maintenance in time to avoid the insulation performance from deterioration or equipment failure due to gas leakage.

[0043] In the process of adjusting the alarm threshold, if it is necessary to adjust the "air pressure threshold for triggering the alarm" according to the test requirements, it can be achieved by rotating the screw 67: when it is necessary to lower the alarm threshold (i.e., to trigger the alarm only at a lower air pressure), rotate the screw 67 clockwise. The screw 67 moves downward along the threaded hole at the top of the second insulation box 62, causing the compression plate 68 to slide downward along the second guide rod 63, increasing the compression degree on the spring 69, and increasing the preload of the spring 69. At this time, it is necessary to further reduce the air pressure inside the test transformer 1 and further reduce the upward thrust of the piston 64 so that the spring 69 can push the lifting plate 66 down to the contact point, thereby reducing the air pressure threshold for triggering the alarm.

[0044] When it is necessary to increase the alarm threshold (i.e., trigger the alarm with higher air pressure), rotate the screw 67 counterclockwise. The screw 67 moves upward, causing the compression plate 68 to slide upward, reducing the compression of the spring 69 and decreasing the preload of the spring 69. At this time, the air pressure inside the test transformer 1 decreases slightly, which allows the spring 69 to push the lifting plate 66 down to the contact point, thereby increasing the air pressure threshold for alarm triggering.

[0045] Through the above adjustment methods, the pressure monitoring mechanism 6 can be adapted to test transformers 1 of different models and different insulating gas types.

[0046] The working principle is as follows:

[0047] Step 1: Connect the test control console connected to the power supply to the fast response voltage detector 51, connect the test transformer 1 to the transformer under test, and connect the fourth contact 611 on the left side to the power supply. The test control console will increase the voltage and transmit it to the test transformer 1 through the fast response voltage detector 51, the first wire 52, the first contact 56, the second contact 511, the second wire 510 and the terminal 2. The voltage will be further increased by the test transformer 1 and then transmitted to the transformer under test, thereby performing a withstand voltage test on the transformer under test.

[0048] Step 2: When the voltage transmitted from the test control console to the test transformer 1 is over-voltage or the voltage rise rate is too fast, the fast response voltage detector 51 detects the abnormality and transmits the signal to the main controller. The main controller then controls the de-energized electromagnet 57 to supply power. At the same time, the fast response voltage detector 51 transmits the signal to the first warning light 3, which sounds an alarm. The de-energized electromagnet 57 is energized, causing its magnetic force to disappear. Under the influence of gravity, the second connecting seat 58 falls until it contacts the baffle 512. This causes the first contact 56 and the second contact 511 to separate, thus forming an open circuit and preventing the continued supply of voltage to the test transformer 1, thereby preventing irreversible damage to the transformer.

[0049] Step 3: When gas leaks inside the test transformer 1, the pressure inside the chamber decreases. As the pressure inside the test transformer 1 decreases, the lifting plate 66, under the elastic force of the spring 69, pushes the piston rod 65 and piston 64 downward. When the pressure inside the test transformer 1 decreases to the point where the third contact 610 and the fourth contact 611 contact, a circuit is formed, causing the second warning light 4 to sound an alarm and alert the staff. At the same time, the greater the compression of the spring 69, the greater its elastic force, which in turn drives the compression plate 68 to move up and down by rotating the screw 67. By adjusting the elastic force of the spring 69, the pressure inside the test transformer 1 can be adjusted to trigger the alarm.

[0050] In summary, this device can provide real-time feedback on the voltage applied to the transformer, effectively avoiding insulation damage caused by voltage overshoot and excessively rapid voltage rise, thereby extending the transformer's service life and reducing the risk of safety accidents caused by insulation failure. Furthermore, the device is equipped with a gas leak monitoring mechanism, which can monitor for gas leaks in real time, enhancing the accuracy of test results and significantly reducing the risk of equipment failure and environmental pollution caused by gas leaks, perfectly aligning with the green and sustainable power grid development concept.

[0051] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A transformer withstand voltage testing device, characterized by, Include: Test transformer (1); The number of terminal posts (2) is several, and several terminal posts (2) are arranged on the front side of the top of the test transformer (1); The first warning light (3) is arranged on the left side of the top of the test transformer (1); The second warning light (4) is arranged on the left side of the top of the test transformer (1); The voltage monitoring mechanism (5) is arranged on the right side of the top of the test transformer (1); The pressure monitoring mechanism (6) is arranged on the left side of the top of the test transformer (1); The voltage monitoring mechanism (5) comprises: The fast response voltage detector (51) is arranged on the right side of the top of the test transformer (1), and the fast response voltage detector (51) and the first warning light (3) are electrically connected; One end of the first lead (52) is arranged on the left side of the fast response voltage detector (51); The first insulating box (53) is arranged on the right side of the top of the test transformer (1); The number of first guide rods (54) is several, and the upper and lower ends of the first guide rods (54) are arranged on the left and right sides of the inner cavity of the first insulating box (53); The first connecting seat (55) is arranged in the middle of the top of the inner cavity of the first insulating box (53), and the other end of the first lead (52) extends into the inner cavity of the first connecting seat (55); The first contact (56) is arranged on the top of the inner cavity of the first connecting seat (55), and the other end of the first lead (52) is electrically connected with the first contact (56); The power-off electromagnet (57) is arranged at the bottom of the first connecting seat (55), and the power-off electromagnet (57) and the fast response voltage detector (51) are electrically connected.

2. The transformer voltage withstand test device of claim 1, wherein The voltage monitoring mechanism (5) further comprises: The second connecting seat (58) is slidably connected to the top of the outer wall of the first guide rod (54), and the position of the second connecting seat (58) corresponds to the position of the first connecting seat (55); The permanent magnet (59) is arranged on the top of the second connecting seat (58), and the power-off electromagnet (57) and the permanent magnet (59) are magnetically attracted; The second contact (511) is arranged at the bottom of the inner cavity of the second connecting seat (58), and the second contact (511) is in contact with the first contact (56); One end of the second lead (510) is arranged at the bottom of the second contact (511), and the other end of the second lead (510) extends out of the inner cavity of the first insulating box (53) and is electrically connected with the terminal post (2).

3. The transformer voltage withstand test device of claim 2, wherein, The outer wall of the first guide rod (54) is provided with a baffle (512) below the second connecting seat (58).

4. The transformer voltage withstand test device of claim 3, wherein, The pressure monitoring mechanism (6) comprises: A piston cylinder (61) is arranged on the left side of the top end of the test transformer (1), and the inner cavity of the piston cylinder (61) is connected with the inner cavity of the test transformer (1); A second insulation box (62) is arranged on the left side of the top end of the test transformer (1), and the second insulation box (62) is located above the piston cylinder (61); Two second guide rods (63) are arranged, and the upper and lower ends of the two second guide rods (63) are respectively arranged on the left and right ends of the inner cavity of the second insulation box (62); A piston (64) is slidably connected to the top end of the inner cavity of the piston cylinder (61); A piston rod (65) is arranged on the top end of the piston (64), and the top end of the piston rod (65) is slidably extended into the inner cavity of the second insulation box (62); A lifting plate (66) is arranged on the top end of the piston rod (65), and the lifting plate (66) is slidably connected to the outer wall of the second guide rod (63).

5. The transformer voltage withstand test device of claim 4, wherein, The pressure monitoring mechanism (6) further comprises: A screw rod (67) is arranged on the middle part of the top end of the second insulation box (62); An extrusion plate (68) is arranged on the bottom end of the screw rod (67), and the extrusion plate (68) is slidably connected to the outer wall of the second guide rod (63); Two springs (69) are arranged on the outer wall of the two second guide rods (63), respectively, and the top end of the spring (69) is connected to the bottom end of the extrusion plate (68), and the bottom end of the spring (69) is connected to the top end of the lifting plate (66).

6. The transformer voltage withstand test device of claim 5, wherein, The bottom end of the lifting plate (66) is provided with a third contact (610) on the left and right sides, and the two third contacts (610) are electrically connected, the inner cavity of the second insulation box (62) is provided with a fourth contact (611) on the left and right sides, the position of the third contact (610) corresponds to the position of the fourth contact (611), and the fourth contact (611) on the right side is electrically connected with the second warning lamp (4).

7. The transformer voltage withstand test device of claim 6, wherein, The distance from the bottom end of the piston (64) to the bottom end of the inner cavity of the piston cylinder (61) is greater than the distance from the third contact (610) to the fourth contact (611).

8. A transformer voltage withstand test method applied to the transformer voltage withstand test device of claim 7, specifically comprising the following steps: Step one, connect the test console connected with power supply and the fast response voltage detector (51), connect the test transformer (1) and the transformer to be tested, the fourth contact (611) on the left side and the power supply, the test console will increase the voltage through the fast response voltage detector (51), the first wire (52), the first contact (56), the second contact (511), the second wire (510) and the terminal post (2) to the test transformer (1), the voltage is further increased through the test transformer (1) and transmitted to the transformer to be tested, so as to test the withstand voltage of the transformer to be tested; Step two, when the voltage transmitted by the test console to the test transformer (1) appears overvoltage and overvoltage rate, the fast response voltage detector (51) monitors the abnormal situation, and then the fast response voltage detector (51) transmits the signal to the main controller, and uses the main controller to control the power supply of the loss type electromagnet (57), at the same time, the fast response voltage detector (51) transmits the signal to the first warning lamp (3), the first warning lamp (3) gives the alarm, the loss type electromagnet (57) is electrified to make its magnetic force disappear, so as to make the second connecting seat (58) fall under the gravity factor, until the second connecting seat (58) and the baffle (512) contact, and then make the first contact (56) and the second contact (511) separate, so as to form the open circuit, prevent the voltage from being transmitted to the test transformer (1), so as to prevent irreversible damage to the transformer; Step three, when the gas in the inner cavity of the test transformer (1) leaks, the pressure in the inner cavity will decrease, with the decrease of the pressure in the inner cavity of the test transformer (1), the lifting plate (66) will push the piston rod (65) and the piston (64) to move downward under the elastic force of the spring (69), when the pressure in the inner cavity of the test transformer (1) decreases to the third contact (610) and the fourth contact (611), so as to form the circuit conduction, promote the second warning lamp (4) to give the alarm, remind the staff, at the same time, because the greater the degree of extrusion of the spring (69), the greater the elastic force will be, and then the extrusion plate (68) is driven to move up and down through the rotating screw rod (67), by adjusting the elastic force value of the spring (69), the value of the test transformer (1) inner cavity gas pressure can be adjusted to the alarm standard.

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