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CN-224216813-U - Transformer insulating oil dielectric strength testing device

CN224216813UCN 224216813 UCN224216813 UCN 224216813UCN-224216813-U

Abstract

The application relates to a dielectric strength testing device for insulating oil of a transformer, which comprises a detection box body, a detection unit, an oil discharge pipe, a return pipe, a mounting frame, a double-filtering unit, a first branch pipe and a second branch pipe, a linkage type spherical valve bank, wherein the linkage type spherical valve bank is composed of two spherical valves which are oppositely arranged, the spherical valves are respectively arranged at the end parts of the first branch pipe and the second branch pipe, which are close to the oil discharge pipe, the free ends of valve rods of the two spherical valves are fixedly connected to form a synchronous reverse movement mechanism, a return cavity is arranged at the end part of the mounting frame, which is close to the return pipe, and is communicated with the bottoms of the first mounting cavity and the second mounting cavity, and a converging interface is arranged at the tail end of the return cavity and is communicated with the return pipe. The application realizes the alternate use and maintenance of the filtering unit by operating the synchronous reverse motion mechanism under the condition of not stopping the operation of the device, thereby ensuring the continuous operation of the device. The problem that the test is interrupted when the filter screen is replaced by the detection device is effectively solved.

Inventors

  • DU SIPING
  • Du Jugui

Assignees

  • 武汉港瑞电气有限公司

Dates

Publication Date
20260508
Application Date
20250710

Claims (8)

  1. 1. A transformer insulating oil dielectric strength testing arrangement, characterized in that includes: a detection box (1) provided with a dielectric strength detection unit (2) inside; An oil discharge pipe (211) which is communicated with the right end part of the detection pipe (21) of the dielectric strength detection unit (2); The return pipe (3) is arranged outside the detection box body (1) and forms a circulation loop with the dielectric strength detection unit (2); The mounting frame (4) is fixed between the oil discharge pipe (211) and the return pipe (3), and a first mounting cavity (41) and a second mounting cavity (42) are arranged in parallel along the vertical direction of one side of the mounting frame, which faces to the sealing door (11) of the detection box body (1); the filter units are provided with two filter boxes (5) and handles (51) and are respectively detachably arranged in the first mounting cavity (41) and the second mounting cavity (42); a first branch pipe (411) and a second branch pipe (421) respectively connected with the oil discharge pipe (211), the first installation cavity (41) and the second installation cavity (42); The linkage type ball valve (6) group consists of two opposite ball valves (6), the ball valves (6) are respectively arranged at the end parts of the first branch pipe (411) and the second branch pipe (421) close to the oil discharge pipe (211), and the free ends of the valve rods of the two ball valves (6) are fixedly connected to form a synchronous reverse movement mechanism; The backflow cavity (43) is formed at one end of the mounting frame (4) close to the backflow pipe (3) and is communicated with the bottoms of the first mounting cavity (41) and the second mounting cavity (42); And the confluence interface (431) is arranged at the tail end of the backflow cavity (43) and is communicated with the backflow pipe (3).
  2. 2. The transformer insulating oil dielectric strength testing device according to claim 1, wherein sealing rings (52) are embedded at the inlet end and the outlet end of the filter box (5), and the thickness of the sealing rings (52) is larger than the installation gap between the filter box (5) and the installation frame (4).
  3. 3. The transformer insulating oil dielectric strength testing device according to claim 2, wherein the inner walls of the first installation cavity (41) and the second installation cavity (42) are provided with annular grooves (44) corresponding to the positions of the sealing rings (52), and the sealing rings (52) are embedded in the annular grooves (44) in an interference mode.
  4. 4. The transformer insulating oil dielectric strength testing device according to claim 1, wherein an elastic buckle (53) is slidably arranged at the top of the filter box (5), and a clamping groove (45) matched with the buckle (53) is formed in the position, corresponding to the buckle (53), of the mounting frame (4).
  5. 5. The transformer insulating oil dielectric strength testing device according to claim 4, wherein a guiding inclined plane is arranged at the end part of the buckle (53), a poking piece (531) is fixedly connected to the outer side of the buckle (53), and an anti-slip structure is arranged on the surface of the poking piece (531).
  6. 6. The transformer insulating oil dielectric strength testing device according to claim 1, wherein a transparent observation window (54) is arranged at the top of the filter box (5).
  7. 7. The transformer insulating oil dielectric strength testing device according to claim 1, wherein a handle (61) is fixedly connected to the joint of the valve rods of the two ball valves (6).
  8. 8. A transformer insulation oil dielectric strength testing device according to claim 1, characterized in that the confluence interface (431) is located lower than the outlet end of the filter box (5) located below.

Description

Transformer insulating oil dielectric strength testing device Technical Field The application relates to the technical field of transformer insulating oil detection, in particular to a transformer insulating oil dielectric strength testing device. Background In large-scale electric networks, the safe and stable operation of a power transformer is of great importance, and transformer insulating oil is used as a key component of the transformer, and the performance of the transformer insulating oil directly influences the insulating effect and the service life of the transformer. Along with the continuous expansion of the power grid scale and the improvement of the voltage level, the requirements on the accuracy and the reliability of the transformer insulating oil detection are also higher and higher. The transformer insulating oil plays an important role in insulation and heat dissipation in a power system, and the dielectric strength is a key index for measuring the insulation performance of the transformer insulating oil. The dielectric strength of the insulating oil of the transformer is accurately detected, and the dielectric strength is important for guaranteeing the safe and stable operation of the transformer. The Chinese patent application with the application number of CN202420563562.6 in the related art provides a transformer insulation oil breakdown voltage on-site detection device, which comprises a detection box and supporting legs, wherein the detection box is internally provided with a detection device and a filtering device. This transformer insulating oil hits on-spot detection device of voltage, detect the oil temperature of insulating oil through temperature sensor, when the oil temperature is too low, start the inside electric heater strip of electric heater cabinet and heat the inside insulating oil of oil delivery pipe, thereby avoid because the oil temperature is unstable, influence the condition emergence of testing result, mechanical vibration in the transformer operation in-process, partial discharge and the ageing effect of oilpaper insulation, can produce a large amount of solid impurity particles in transformer oil, like iron particle, copper particle, carbon particle and fibre granule, consequently, after the detection is accomplished, the inside of filter box is gone into to insulating oil transmission through oil drain pipe, intercept the solid particle of insulating oil inside through the filter screen, thereby increase the life of insulating oil. The related art has the disadvantage that the detection device mainly detects the dielectric strength of the extracted insulating oil. For a large-scale power grid power transformer, the impurities in the insulating oil are more, the filter screen is easy to block, the normal flow of the insulating oil is influenced, the detection process is blocked, the detection efficiency is reduced, and the filter screen is required to be replaced by stopping the machine to cut off the current and opening the sealing top cover, so that the secondary pollution of the insulating oil is easy to be caused while the test is interrupted. Disclosure of utility model In order to solve the problem that the detection device can cause test interruption when the filter screen is replaced, the application provides a transformer insulating oil dielectric strength testing device. The application provides a transformer insulating oil dielectric strength testing device which adopts the following technical scheme: The dielectric strength testing device for the insulating oil of the transformer comprises a detection box body, wherein a dielectric strength detection unit is arranged in the detection box body; An oil drain pipe communicated with the right end part of the detection pipe of the dielectric strength detection unit; The return pipe is arranged outside the detection box body and forms a circulation loop with the dielectric strength detection unit; The mounting frame is fixed between the oil drain pipe and the return pipe, and a first mounting cavity and a second mounting cavity are arranged in parallel along the vertical direction of the mounting frame towards one side of the sealing door of the detection box body; The filter units are provided with two filter boxes and handles, and are respectively detachably arranged in the first mounting cavity and the second mounting cavity; the first branch pipe and the second branch pipe are respectively connected with the oil discharge pipe, the first mounting cavity and the second mounting cavity; The linkage type spherical valve group consists of two spherical valves which are oppositely arranged, the spherical valves are respectively arranged at the end parts of the first branch pipe and the second branch pipe, which are close to the oil discharge pipe, and the free ends of valve rods of the two spherical valves are fixedly connected to form a synchronous reverse movement mechanism; the reflux cavity is arrange