Test auxiliary device for 500kV metal oxide arrester without disassembling lead

Abstract

The invention relates to the technical field of electrical tests, and discloses a 500kV metal oxide arrester test auxiliary device without dismounting a lead, which comprises a box body, a handle is fixedly connected to the front side of the box body, an outer shell is fixedly connected to the inner wall of the box body, a box cover is hinged to the upper part of the box body, and buckles are arranged on the left and right sides of the lower part of the front side of the box cover. The interior of the box body is filled with an insulating material, the left side of the interior of the box body is provided with an impedance adjustable assembly, the impedance adjustable assembly comprises a plurality of auxiliary lightning arresters, the right side of the interior of the box body comprises an ampere meter, the left front side of the upper part of the ampere meter is fixedly connected with an anode wiring terminal, and the right front side of the upper part of the ampere meter is fixedly connected with a cathode wiring terminal. According to the invention, the impedance value can be adjusted through the plurality of auxiliary lightning arresters; the auxiliary lightning arrester is integrated with the ampere meter; the insulating strength is improved; the influence of external causes on test results is eliminated, and the test accuracy is improved; the device is light in weight and convenient to carry and store, and the working efficiency and economic benefits are remarkably improved.

Description

Technical Field

[0001] The invention relates to the technical field of electrical testing, and in particular to a 500kV metal oxide arrester test auxiliary device without removing the lead wire. Background Art

[0002] With the rapid development of the power system, 500kV voltage-level power equipment has now become the main grid of Liaoning Power Grid. Metal oxide lightning arresters (hereinafter referred to as MOA) are particularly important for the safe and stable operation of the power system. 500kV MOA usually consists of 3 sections, and the height is about 8m including the pillars. Usually, when the arrester is tested, the primary lead of the arrester must be disassembled. Because the high-voltage lead is very far from the ground, it is necessary to use an insulated boom truck to assist in the removal of the high-voltage lead, which is not only labor-intensive and time-consuming, but also increases the cost of equipment maintenance and testing. At the same time, due to the high electrostatic induction voltage of the 500kV equipment site, it poses a hidden danger to the personal safety of the staff. In order to improve the efficiency of the test work, save manpower and material resources, reduce the power outage time of the equipment, and reduce the impact of electrostatic interference voltage, 500kV MOA now generally adopts the test method without removing the high-voltage lead.

[0003] In order to ensure the safe and stable operation of metal oxide lightning arresters, the "Test Procedure for Condition Inspection and Maintenance of Power Transmission and Transformation Equipment" Q / GDW1168-2013 stipulates that during a power outage, the critical operating voltage at 1mA of MOA DC (hereinafter referred to as U1mA, the initial value difference does not exceed ±5%) and the leakage current at 75% U1mA DC voltage (≤50uA or the initial value difference ≤30%) tests should be carried out.

[0004] When the original middle section 500kVMOA test was conducted, an auxiliary lightning arrester was connected in series between the lead wires connecting the leakage current meter of the lower section counter and the ground, which increased the critical action voltage value of the lower section. However, the original auxiliary test device was not standardized enough. The copper wires connected in series with multiple lightning arresters were easy to break, and they were easy to be bumped during long distances and during test transportation, which damaged the auxiliary lightning arrester. The insulation was not enough during the test in a humid environment, and the U1mA value was low, which increased the error and affected the test results. Summary of the invention

[0005] In order to make up for the above shortcomings, the present invention provides a 500kV metal oxide arrester test auxiliary device without removing the lead, aiming to improve the problems in the prior art that the series connection of the arrester is easy to break, the auxiliary arrester is easy to be damaged by bumping during transportation, and the insulation is insufficient during testing in a humid environment, resulting in increased errors and affecting the test results.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a 500kV metal oxide arrester test auxiliary device without removing the lead, comprising a box body, a handle fixedly connected to the front side of the box body, an outer shell fixedly connected to the inner wall of the box body, a box cover hinged on the upper part of the box body, buckles are arranged on the left and right sides of the lower front side of the box cover, the interior of the box body is filled with insulating material, and an impedance adjustable component is arranged on the left side of the interior of the box body.

[0007] As a further description of the above technical solution: The auxiliary device includes an ammeter, which is fixedly connected to the right side of the bottom of the box body, a positive terminal is fixedly connected to the left front side of the upper part of the ammeter, a negative terminal is fixedly connected to the right front side of the upper part of the ammeter, a grounding terminal is arranged on the right front side inside the box body, a plurality of lead terminals are evenly fixedly connected to the left side inside the box body, and auxiliary lightning arresters are fixedly connected to the same side of the lead terminals.

[0008] As a further description of the above technical solution: The auxiliary lightning arrester adopts nonlinear material.

[0009] As a further description of the above technical solution: The insulating material is epoxy resin, and the outer shell is made of aluminum alloy.

[0010] As a further description of the above technical solution: The lead terminal is connected to the positive electrode terminal, and the negative electrode terminal is connected to the ground terminal.

[0011] As a further description of the above technical solution: During the on-site test, the grounding terminal is connected to the grounding bar of the ground equipment.

[0012] As a further description of the above technical solution: The lead-out terminal and the bottom of the auxiliary lightning arrester are embedded with insulating materials, and the auxiliary lightning arrester is fixedly connected to the inside of the box by bolts.

[0013] As a further description of the above technical solution: The low-voltage side ammeter is connected in series to the upper and middle flanges of the 500kV metal oxide arrester and is grounded, and the auxiliary device is connected in series between the leads of the MOA lower section counter leakage ammeter and the ground.

[0014] The present invention has the following beneficial effects: In the present invention, the impedance value is adjustable through multiple auxiliary lightning arresters; the auxiliary lightning arrester is integrated with the ammeter; the insulation strength is improved; the influence of external factors on the test results is eliminated, and the test accuracy is improved; the device is light in weight, easy to carry and keep, and the work efficiency and economic benefits are significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A three-dimensional diagram of a test auxiliary device for a 500kV metal oxide arrester without removing the lead wire proposed by the present invention; Figure 2 This is an open top view of a 500kV metal oxide arrester test auxiliary device without removing the lead wire proposed by the present invention; Figure 3 This is an open top perspective view of a 500kV metal oxide arrester test auxiliary device without removing the lead wire proposed by the present invention; Figure 4 This is an open front perspective view of a 500kV metal oxide arrester test auxiliary device without removing the lead wire proposed by the present invention; Figure 5 The present invention discloses a field test wiring diagram of a 500kV metal oxide arrester test auxiliary device without removing the lead wire.

[0016] Legend: 1. Handle; 2. Buckle; 3. Box cover; 4. Box body; 5. Lead terminal; 6. Ground terminal; 7. Outer shell; 8. Ammeter; 9. Positive terminal; 10. Negative terminal; 11. Auxiliary lightning arrester; 12. Low-voltage side ammeter; 13. Counter leakage ammeter. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] Reference Figure 1-Figure 3, an embodiment provided by the present invention: an auxiliary device for testing a 500kV metal oxide arrester without removing the lead, comprising a box body 4, a handle 1 fixedly connected to the front side of the box body 4, an outer shell 7 fixedly connected to the inner wall of the box body 4, a box cover 3 hingedly connected to the upper part of the box body 4, buckles 2 are arranged on the left and right sides of the lower front side of the box cover 3, the inside of the box body 4 is filled with insulating material, an impedance adjustable component is arranged on the left side of the inside of the box body 4, the auxiliary device comprises an ammeter 8, the ammeter 8 is fixedly connected to the right side of the bottom of the box body 4, a positive terminal 9 is fixedly connected to the left rear side of the upper left side of the ammeter 8, and the upper part of the ammeter 8 A negative terminal 10 is fixedly connected to the right rear side, a grounding terminal 6 is arranged on the right rear side inside the box 4, and a number of lead terminals 5 are evenly and fixedly connected to the left side inside the box 4. Auxiliary lightning arresters 11 are fixedly connected on the same side of the lead terminals 5. The auxiliary lightning arrester 11 adopts nonlinear material, the lead terminal 5 is connected to the positive terminal 9, the negative terminal 10 is connected to the grounding terminal 6, the grounding terminal 6 is connected to the grounding bus of the ground equipment, the lead terminal 5 and the bottom of the auxiliary lightning arrester 11 are embedded with insulating material, and the auxiliary lightning arrester 11 is fixedly connected to the inside of the box 4 by bolts.

[0019] A plurality of auxiliary lightning arresters 11 and an ammeter 8 are integrated into a box, and the shunt function can be adjusted according to different situations to better protect the insulation of the base of the metal oxide lightning arrester, and a handle 1 is provided for easy carrying. The auxiliary lightning arrester 11 adopts nonlinear materials and has an adjustable impedance value. The test current is monitored by the ammeter 8, and the auxiliary device is connected in series between the leads connected to the ground by the leakage ammeter 13 of the lower section counter of the MOA, the impedance value is selected, the corresponding lead-out terminal 5 is connected, the range of the ammeter 8 is selected, and the test wiring is completed. The low-voltage side ammeter 12 is connected in series at the upper and middle section flanges of the 500kV metal oxide lightning arrester and grounded, and high voltage is applied at the middle and lower section flanges. When the low-voltage side ammeter 12 reaches 1mA, the middle section voltage reaches the critical action voltage and acts. Since the lower section has more auxiliary devices in series than the middle section, the critical action voltage value of the lower section is increased by about 3kV, and the lower section MOA will delay the action. The leakage current at U1mA and 75%U1mA of the middle section MOA is measured, thereby achieving our test purpose. During the pressurization process of the middle section test, the value of the auxiliary device ammeter 8 in series in the lower section must be monitored to be no more than 1mA, so as to monitor the overload of the DC high-voltage generator and protect the MOA base insulation from being damaged during the test.

[0020] Reference Figure 3-Figure 5 The insulating material is epoxy resin, the outer shell 7 is made of aluminum alloy, the low-voltage side ammeter (12) is connected in series at the upper and middle flanges of the 500kV metal oxide arrester and grounded, and the auxiliary device is connected in series between the leads of the MOA lower section counter leakage ammeter (13) and the ground.

[0021] The epoxy resin provides excellent electrical insulation performance, which indirectly ensures the electrical safety of the equipment. The aluminum alloy shell provides good heat dissipation, mechanical protection and corrosion resistance, while having light weight and good pressure resistance.

[0022] Working principle: When it is necessary to test the leakage current under U1mA and 75%U1mA of the middle section of a 500kV metal oxide arrester, the auxiliary device is connected in series between the leads connected to the ground of the leakage current meter 13 of the lower section counter of the MOA, the impedance value is selected, the corresponding lead-out terminal 5 is connected, the range of the ammeter 8 is selected, and the test wiring is completed. The low-voltage side ammeter 12 is connected in series to the flanges of the upper and middle sections of the 500kV metal oxide arrester and grounded, and high voltage is applied to the flanges of the middle and lower sections. When the low-voltage side ammeter 12 reaches 1mA, the middle section voltage reaches the critical action voltage and operates. Since the lower section has more auxiliary devices in series than the middle section, the critical action voltage value of the lower section is increased by about 3kV, and the lower section MOA will delay the action. The leakage current under U1mA and 75%U1mA of the middle section MOA is measured, thereby achieving our test purpose. During the pressurization process of the middle section test, the value of the auxiliary device ammeter 8 in series in the lower section must be monitored to be no more than 1mA, so as to monitor the overload of the DC high-voltage generator and protect the MOA base insulation from being damaged during the test.

[0023] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A 500 kV metal oxide arrester test auxiliary device without removing the lead wire, comprising a box (4), characterized in that: The front side of the box body (4) is fixedly connected to a handle (1); the inner wall of the box body (4) is fixedly connected to an outer shell (7); a box cover (3) is hingedly connected to the upper part of the box body (4); buckles (2) are arranged on the left and right sides of the lower front side of the box cover (3); the interior of the box body (4) is filled with insulating material; and an impedance adjustable component is arranged on the left side of the interior of the box body (4).

2. The auxiliary device for testing a 500kV metal oxide arrester without removing the lead wire according to claim 1, characterized in that: The auxiliary device comprises an ammeter (8), the ammeter (8) being fixedly connected to the right side of the bottom of the box (4), a positive terminal (9) being fixedly connected to the left front side of the upper part of the ammeter (8), a negative terminal (10) being fixedly connected to the right front side of the upper part of the ammeter (8), a grounding terminal (6) being arranged on the right front side of the box (4), a plurality of lead terminals (5) being evenly fixedly connected to the left side of the box (4), and auxiliary lightning arresters (11) being fixedly connected to the same side of the lead terminals (5).

3. The auxiliary device for testing a 500kV metal oxide arrester without removing the lead wire according to claim 2, characterized in that: The auxiliary lightning arrester (11) is made of nonlinear material.

4. The auxiliary device for testing a 500kV metal oxide arrester without removing the lead wire according to claim 1, characterized in that: The insulating material is epoxy resin, and the outer shell (7) is made of aluminum alloy.

5. The auxiliary device for testing 500kV metal oxide arrester without removing the lead wire according to claim 2, characterized in that: The lead terminal (5) is connected to the positive electrode terminal (9), and the negative electrode terminal (10) is connected to the ground terminal (6).

6. The auxiliary device for testing 500kV metal oxide arrester without removing the lead wire according to claim 2, characterized in that: During a field test, the grounding terminal (6) is connected to a grounding bar of ground equipment.

7. The auxiliary device for testing 500kV metal oxide arrester without removing the lead wire according to claim 2, characterized in that: The lead-out terminal (5) and the bottom of the auxiliary lightning arrester (11) are embedded with insulating material, and the auxiliary lightning arrester (11) is fixedly connected to the inside of the box (4) by bolts.

8. The test auxiliary device for 500kV metal oxide arrester without removing the lead wire according to claim 1, characterized in that: The low-voltage side ammeter (12) is connected in series to the upper and middle flanges of the 500 kV metal oxide arrester and is grounded, and the auxiliary device is connected in series between the leads of the MOA lower section counter leakage ammeter (13) and the ground.

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