High-temperature and high-pressure insulation testing device

Abstract

The invention relates to a high-temperature and high-pressure insulation testing device, in particular to an electrical insulation material performance testing device, and aims to solve the problem of poor safety of the conventional testing device. A furnace body is of a closed box type structure, and an openable double-layer heat insulation door is arranged on the front face of the furnace body; the heating system is arranged in the furnace body and used for increasing the temperature in the furnace body. The high-voltage applying system is used for providing high voltage for the to-be-tested sample; the control box is electrically connected with the heating system and the high-voltage applying system and used for controlling the heating curve and the heat preservation temperature of the heating system. And high-voltage output parameters of the high-voltage applying system are also controlled. The beneficial effects of the invention are that: innovative high-voltage introduction design employs special high-voltage insulation assemblies, effectively solves the problems of high-voltage breakdown and surface flashover in a high-temperature environment, and ensures the safety of a test process and the accuracy of data.

Description

TECHNICAL FIELD

[0001] The application relates to a device for testing the performance of an electrical insulation material. BACKGROUND

[0002] Insulating materials are key basic materials in the fields of power equipment, high-temperature industrial furnaces, aerospace and nuclear energy, etc. The reliability of the insulation performance thereof is directly related to the safe and stable operation of the entire equipment or system. In actual applications, many insulating materials (such as refractory bricks, ceramic fiber products, etc.) need to work in a high-temperature (more than 400 DEG C) or even super-high-temperature environment while bearing a working voltage of several kilovolts.

[0003] At present, the common insulating material test devices (such as high-voltage breakdown testers, insulation resistance testers, etc.) on the market and the standard test equipment of major testing institutions usually have a working temperature range of room temperature to 300 DEG C, and the voltage grade is also limited to several kilovolts specified in the standard. These devices cannot simulate the real performance of the materials under extreme working conditions.

[0004] Through retrieval and research, the prior art has the following obvious defects:

[0005] Temperature limitation: the heating elements, heat preservation structures and temperature measuring elements of ordinary test boxes cannot work stably in a high-temperature environment of more than 400 DEG C for a long time, and it is even more difficult to reach a super-high-temperature level of more than 1000 DEG C.

[0006] Insulation and voltage resistance limitation: in a high-temperature environment, the conventional insulation support structure and lead wire mode will degrade in performance, cannot effectively isolate several kilovolts of high voltage, and is extremely prone to surface discharge or breakdown, resulting in test failure or even equipment damage.

[0007] Structural design defects: there is a lack of special furnace body structure, electrode introduction system and sample installation platform that can simultaneously withstand super-high temperature and super-high voltage. The electrode introduction device of an ordinary furnace body will become a weak point of insulation under high temperature and high voltage.

[0008] Therefore, there is an urgent need in the field for a special test device that can simulate extreme working conditions, i.e. accurately, reliably and safely test the electrical performance of insulating materials under the simultaneous action of high temperature of 400 DEG C to 1200 DEG C and high voltage of more than 6kV. SUMMARY

[0009] The application aims to solve the problem of poor safety of the existing test device, and provides a high-temperature and high-voltage insulation test device.

[0010] The high-temperature and high-voltage insulation test device comprises a furnace body, a heating system, a high-voltage application system and a control box.

[0011] The furnace body is a closed box structure, and an openable double-layer insulation door is provided on the front of the furnace body;

[0012] The heating system is located inside the furnace body and is used to raise the temperature inside the furnace body;

[0013] The high-pressure application system is used to provide high pressure to the sample to be tested;

[0014] The control box is electrically connected to the heating system and the high-pressure application system respectively, and is used to control the heating system's temperature rise curve and heat preservation temperature; it is also used to control the high-pressure output parameters of the high-pressure application system.

[0015] Furthermore, the furnace body has a cuboid structure, and its walls are filled with ceramic fiber modules as an insulation layer.

[0016] Furthermore, the double-layered insulated door is fitted with a quartz glass observation window.

[0017] Furthermore, the heating system includes multiple sets of heating wires and heating wire leads;

[0018] Multiple sets of heating wires are distributed on the left and right side walls inside the furnace body;

[0019] The heating wire leads out from a hole in the lower part of the rear wall of the furnace and connect to the control box.

[0020] Furthermore, the heating wire is a silicon molybdenum rod or a silicon carbide rod.

[0021] Furthermore, the high-voltage application system includes a positive high-voltage insulation component, a discharge positive electrode, a negative high-voltage insulation component, a negative electrode lead, an insulation platform, a metal steel plate, and a high-voltage test transformer;

[0022] The positive discharge electrode is introduced into the furnace body through a through hole at the top of the furnace body; and the through hole at the top of the furnace body is sealed and insulated by a positive electrode high-voltage insulation component; at the same time, the positive discharge electrode is connected to the positive electrode of the high-voltage test transformer;

[0023] The insulating platform is located at the bottom of the furnace body;

[0024] The metal plate is placed on an insulating platform, with the positive discharge electrode located directly above it. The vertical distance between the bottom of the positive discharge electrode and the metal plate is adjustable. The test sample is placed on the metal plate. Simultaneously, the metal plate is connected to the negative electrode of the high-voltage test transformer via a negative electrode lead from the rear wall of the furnace body. The negative electrode lead is sealed and insulated against the rear wall of the furnace body via a negative electrode high-voltage insulation component.

[0025] Furthermore, the bottom of the positive discharge point is either a pointed tip or a spherical end.

[0026] Furthermore, the insulating platform is composed of multiple mica tubes, ceramic tubes, or corundum tubes laid side by side.

[0027] Furthermore, the heating system has a heating temperature range of 400°C to 1200°C.

[0028] Compared with the prior art, the present invention has the following advantages:

[0029] This invention has the ability to simulate extreme working conditions: for the first time, it integrates ultra-high temperature (up to 1200℃) and high voltage (above 6kV) test conditions into one, filling the gap in existing test equipment and being able to truly reflect the performance of insulating materials under extreme environments.

[0030] High safety and reliability: The innovative high-voltage introduction design (positive electrode at the top of the furnace and negative electrode at the bottom of the furnace) uses specialized high-voltage insulation components, which effectively solves the problems of high-voltage breakdown and surface flashover under high-temperature conditions, ensuring the safety of the test process and the accuracy of the data.

[0031] The structure is rationally designed: the double-layered insulated furnace door and observation window ensure both heat preservation performance and operational safety, while facilitating direct monitoring of the experimental process. The negative electrode is supported by an insulated platform, and the positive electrode height is adjustable, allowing the device to flexibly adapt to samples of various shapes and thicknesses, making it highly versatile.

[0032] Accurate data: Due to the effective heat preservation, insulation and shielding design, environmental interference and system errors are reduced, and the obtained breakdown voltage, leakage current and other data are more real and reliable. Attached Figure Description

[0033] Fig. 1 This is a schematic diagram of the front structure of a high-temperature and high-pressure insulation testing device as described in Specific Implementation Method 1.

[0034] Fig. 2 This is a cross-sectional structural diagram of a high-temperature and high-pressure insulation testing device as described in Specific Implementation Method 1.

[0035] Among them, 1 is the furnace body; 2 is the insulation layer; 3 is the heating wire; 4 is the heating wire lead; 5 is the double-layer insulated door; 6 is the quartz glass observation window; 7 is the positive high-voltage insulation component; 8 is the discharge positive electrode height adjustable; 9 is the negative high-voltage insulation component; 10 is the negative electrode lead; 11 is the insulation platform; 12 is the metal steel plate negative electrode; 13 is the test sample; 14 is the high-voltage test transformer; and 15 is the control box. Detailed Implementation

[0036] Specific Implementation Method 1: Combination Figs. 1-2 This embodiment describes a high-temperature and high-pressure insulation testing device, which includes a furnace body 1, a heating system, a high-pressure application system, and a control box 15.

[0037] The furnace body 1 is a closed box structure, and an openable double-layer insulation door 5 is provided on the front of the furnace body 1.

[0038] The heating system is located inside the furnace body 1 and is used to raise the temperature inside the furnace body 1;

[0039] The high-pressure application system is used to provide high pressure to the test sample 13;

[0040] The control box 15 is electrically connected to the heating system and the high-pressure application system respectively, and is used to control the heating system's temperature rise curve and heat preservation temperature; it is also used to control the high-pressure output parameters of the high-pressure application system.

[0041] In this embodiment, the furnace body 1 constitutes the main structure of the device. It is constructed using high-performance insulation materials (such as ceramic fiber modules) to form a five-sided enclosed box-type furnace body, with a double-layer insulated door 5 with a sealing structure on the front. The double-layer insulated door 5 features a double-layer heat insulation design, with the middle layer filled with insulation material; this reduces heat loss and external interference, ensuring experimental stability. The heating system is integrated inside the furnace body 1; this heating system can uniformly heat the furnace chamber to above 400°C, with a maximum operating temperature of 1200°C. It enables the simultaneous application of high temperature (≥400°C) and high voltage (≥6kV) to meet the requirements of extreme working condition simulation. The high voltage application system is used to apply a test voltage to the sample 13 to be tested; the sample 13 is an insulating material sample (such as refractory bricks, magnesia bricks, high alumina bricks, aluminosilicate fiber blankets or boards, etc.) placed on the negative electrode metal steel plate 12, located between the positive and negative electrodes. The control box 15 is electrically connected to the heating system and the high-voltage application system, respectively, and is used to accurately set and control the heating curve and holding temperature in the furnace, and monitor and record the voltage, current and other parameters output by the high-voltage test transformer, so as to realize automated testing and safety protection. The control box 15 includes a thyristor power regulator and a high-voltage test control module, which is used to set the heating program, holding time and voltage increase rate, and record test data such as breakdown voltage and leakage current. The control box 15 has integrated control, a high degree of automation, and improves testing efficiency and safety.

[0042] Specific Implementation Method Two: This implementation method further defines the high-temperature and high-pressure insulation testing device described in Specific Implementation Method One. In this implementation method, the furnace body 1 has a cuboid structure, and its wall layer is filled with ceramic fiber modules as a heat insulation layer 2.

[0043] In this embodiment, the ceramic fiber module is resistant to high temperature and has low thermal conductivity, effectively maintaining the high temperature environment (up to 1200°C) inside the furnace body 1; the cuboid structure has high space utilization, which facilitates the placement of the test sample 13 and the electrode layout, and improves the consistency of the test.

[0044] Specific Implementation Method 3: This implementation method further defines the high temperature and high pressure insulation testing device described in Specific Implementation Method 1. In this implementation method, a quartz glass observation window 6 is embedded in the double-layer insulation door 5.

[0045] In this embodiment, a high-temperature resistant quartz glass observation window 6 is provided on the double-layer insulated door 5 to observe the test conditions inside the furnace 1 in real time without affecting the internal temperature field of the furnace 1. The quartz glass is high-temperature resistant and has good light transmittance, enabling non-contact real-time observation of the state and discharge process of the test sample 13; it does not affect the temperature field distribution inside the furnace, avoids temperature fluctuations caused by opening the double-layer insulated door 5 for observation, and improves test accuracy and safety.

[0046] Specific Implementation Method Four: This implementation method further defines the high temperature and high pressure insulation testing device described in Specific Implementation Method One. In this implementation method, the heating system includes multiple sets of heating wires 3 and heating wire leads 4.

[0047] Multiple sets of heating wires 3 are distributed on the left and right side walls inside the furnace body 1;

[0048] The heating wire lead 4 is led out from the hole at the lower part of the rear wall of the furnace body 1 and connected to the control box 15.

[0049] In this embodiment, three sets of heating wires 3 are symmetrically installed inside the insulation walls on both sides of the furnace body 1. These heating wires 3 are connected to an external power regulation device via heating wire leads 4, which are led out from specially designed lead holes at the rear of the furnace body 1. The heating temperature field is uniformly distributed on both sides, avoiding local overheating or large temperature gradients, and improving test repeatability. The heating wire leads 4 are located at the rear, away from the high temperature and high pressure area, reducing the risk of high voltage breakdown and enhancing the system insulation reliability.

[0050] Specific Implementation Method 5: This implementation method further defines the high-temperature and high-pressure insulation testing device described in Specific Implementation Method 4. In this implementation method, the heating wire 3 is a silicon molybdenum rod or a silicon carbide rod.

[0051] In this embodiment, the silicon molybdenum rod or silicon carbide rod is resistant to high temperature and oxidation, has a long service life, can work stably for a long time at 1200℃, has high heating efficiency, fast heating rate, sensitive temperature control response, and shortens the test cycle.

[0052] Specific Implementation Method Six: This implementation method further defines the high-temperature and high-pressure insulation testing device described in Specific Implementation Method One. In this implementation method, the high-pressure application system includes a positive high-pressure insulation component 7, a discharge positive electrode 8, a negative high-pressure insulation component 9, a negative lead wire 10, an insulation platform 11, a metal steel plate 12, and a high-pressure test transformer 14.

[0053] The discharge positive electrode 8 is introduced into the furnace body 1 through the top through hole; and the top through hole of the furnace body 1 is sealed and insulated by the positive electrode high voltage insulation component 7; at the same time, the discharge positive electrode 8 is connected to the positive electrode of the high voltage test transformer 14.

[0054] The insulating platform 11 is located at the bottom of the furnace body 1;

[0055] The metal plate 12 is set on the insulating platform 11, the discharge positive electrode 8 is located directly above the metal plate 12, and the vertical distance between the bottom end of the discharge positive electrode 8 and the metal plate 12 is adjustable; the test sample 13 is placed on the metal plate 12; at the same time, the metal plate 12 is led out from the rear side wall of the furnace body 1 through the negative electrode lead 10 and connected to the negative electrode of the high voltage test transformer 14; and the negative electrode lead 10 is sealed and insulated to the rear side wall of the furnace body 1 through the negative electrode high voltage insulation component 9.

[0056] In this embodiment, a 50mm diameter circular hole is made at the center of the top of the furnace body 1. A 10mm diameter stainless steel rod (or tungsten rod) is inserted through this hole as the discharge positive electrode 8. The upper end of the discharge positive electrode 8 is fixed to the top of the furnace body 1 by a threaded lifting mechanism, and the length of the discharge positive electrode 8 extending into the furnace can be precisely adjusted by rotating the handle. The upper part of the discharge positive electrode 8 is connected to the positive terminal of the high-voltage test transformer 14 via a high-voltage line. The part passing through the wall is sealed and insulated by a positive high-voltage insulation component with an umbrella skirt structure. During the test, a refractory brick (or other material) to be tested, the test sample 13, is placed flat on the metal steel plate 12; the double-layer insulation door 5 is closed. The heating program is set through the control box 15 (e.g., heating to 1000℃ at 5℃ / minute and holding at that temperature). After the temperature stabilizes, the high-voltage test transformer 14 is started through the control box 5, and the output voltage is increased at a certain rate until the test sample 13 breaks down, and the system automatically records the breakdown voltage value. By adjusting the height of the positive discharge electrode 8, a small, constant gap (e.g., 1 mm) can be maintained between its lower end and the upper surface of the sample, or it can directly contact the sample for testing according to different standards. The height of the positive electrode is adjustable to accommodate samples 13 of different thicknesses, enabling gap breakdown or contact breakdown testing. Both the positive and negative electrodes are equipped with high-voltage insulation components to effectively prevent surface discharge and breakdown, ensuring testing safety under high temperature and high pressure. The insulating platform 11 isolates the metal steel plate 12 (negative electrode) from the furnace body 1, avoiding ground potential interference and improving measurement accuracy.

[0057] Specific Implementation Method Seven: This implementation method further defines the high-temperature and high-pressure insulation testing device described in Specific Implementation Method Six. In this implementation method, the bottom end of the 8-point discharge positive electrode is a pointed or ball-shaped end.

[0058] In this embodiment, the pointed end is suitable for breakdown testing under localized field strength concentration; the ball end is suitable for standard breakdown testing under uniform electric field conditions, meeting the requirements of different testing standards; the electrode shape can be flexibly switched to improve the versatility of the device and the comparability of data.

[0059] Specific Implementation Method 8: This implementation method further defines the high-temperature and high-pressure insulation testing device described in Specific Implementation Method 6. In this implementation method, the insulation platform 11 is composed of multiple mica tubes, ceramic tubes, or corundum tubes laid side by side.

[0060] In this embodiment, the mica tube, ceramic tube, or corundum tube material has excellent high temperature resistance and insulation properties, and maintains high resistivity even at 1200℃; the tubular structure has uniform load-bearing capacity and strong adaptability to thermal expansion, and is not prone to cracking or deformation under long-term high temperature; modular laying facilitates replacement and maintenance, and reduces usage costs.

[0061] Specific Implementation Method Nine: This implementation method further defines the high-temperature and high-pressure insulation testing device described in Specific Implementation Method One. In this implementation method, the heating temperature range of the heating system is 400°C to 1200°C.

[0062] In this embodiment, the above temperature range covers the operating temperature range of insulating materials under extreme conditions such as high-temperature industrial furnaces, nuclear power plants, and aerospace. The wide temperature range control is linearly adjustable and supports multiple test modes such as gradient heating, constant temperature, and cyclic temperature control. It provides full-temperature performance data support for material research and development and quality inspection, filling the gap in test data.

[0063] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A high-temperature and high-pressure insulation testing device, characterized in that, Includes furnace body (1), heating system, high pressure application system and control box (15); The furnace body (1) is a closed box structure, and an openable double-layer insulation door (5) is provided on the front of the furnace body (1). The heating system is located inside the furnace body (1) and is used to raise the temperature inside the furnace body (1); The high-pressure application system is used to provide high pressure to the test sample (13); The control box (15) is electrically connected to the heating system and the high-pressure application system respectively, and is used to control the heating system's heating curve and heat preservation temperature; It is also used to control the high-pressure output parameters of high-pressure application systems.

2. The high-temperature and high-pressure insulation testing device according to claim 1, characterized in that, The furnace body (1) has a rectangular structure, and its wall layer is filled with ceramic fiber modules as a heat insulation layer (2).

3. The high-temperature and high-pressure insulation testing device according to claim 1, characterized in that, The double-layered insulated door (5) is fitted with a quartz glass observation window (6).

4. The high-temperature and high-pressure insulation testing device according to claim 1, characterized in that, The heating system includes multiple sets of heating wires (3) and heating wire leads (4); Multiple sets of heating wires (3) are distributed on the left and right side walls inside the furnace body (1); The heating wire lead (4) is led out from the hole at the lower part of the rear wall of the furnace body (1) and connected to the control box (15).

5. The high-temperature and high-pressure insulation testing device according to claim 4, characterized in that, The heating wire (3) is a silicon molybdenum rod or a silicon carbide rod.

6. The high-temperature and high-pressure insulation testing device according to claim 1, characterized in that, The high-voltage application system includes a positive high-voltage insulation component (7), a discharge positive electrode (8), a negative high-voltage insulation component (9), a negative lead wire (10), an insulation platform (11), a metal steel plate (12), and a high-voltage test transformer (14). The discharge positive electrode (8) is introduced into the furnace body (1) through the top through hole; and the top through hole of the furnace body (1) is sealed and insulated by the positive electrode high voltage insulation component (7); at the same time, the discharge positive electrode (8) is connected to the positive electrode of the high voltage test transformer (14); The insulating platform (11) is located at the bottom of the furnace body (1); The metal plate (12) is set on the insulating platform (11), the discharge positive electrode (8) is located directly above the metal plate (12), and the vertical distance between the bottom end of the discharge positive electrode (8) and the metal plate (12) is adjustable; the test sample (13) is placed on the metal plate (12); at the same time, the metal plate (12) is led out from the rear side wall of the furnace body (1) through the negative electrode lead (10) and connected to the negative electrode of the high voltage test transformer (14); and the negative electrode lead (10) seals and insulates the rear side wall of the furnace body (1) through the negative electrode high voltage insulation component (9).

7. The high-temperature and high-voltage insulation testing device according to claim 6, characterized in that, The bottom of the positive discharge point (8) is a pointed or ball-shaped end.

8. A high-temperature and high-pressure insulation testing device according to claim 6, characterized in that, The insulating platform (11) is composed of multiple mica tubes, ceramic tubes or corundum tubes laid side by side.

9. A high-temperature and high-pressure insulation testing device according to claim 1, characterized in that, The heating system has a heating temperature range of 400℃ to 1200℃.

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