Multifunctional insulating part withstand voltage test device

Abstract

The invention provides a multifunctional insulating part voltage withstanding test device, and belongs to the technical field of insulating part batch voltage withstanding tests. The problems of low efficiency, low safety and poor accuracy of the handover test work of each insulating part and the lightning arrester at present are solved. Comprising a conductive platform base, post insulator placing grooves are formed in the platform base, a thimble base is fixed in each post insulator placing groove, and a grounding state indicator lamp is arranged on one side of each post insulator placing groove; a supporting spring is arranged below the ejector pin base, one end of the supporting spring is fixed to the bottom face of the platform base, the grounding current detection loop comprises a normally-open contact and a normally-closed contact, the other end of the supporting spring is connected to one end of an inclined face, and the normally-open contact is arranged above the other end of the inclined face. A normally-closed contact is arranged at the other end of the inclined plane and below the normally-open contact, and a fulcrum is arranged in the middle of the inclined plane; the device is applied to the insulating part withstand voltage test.

Description

Technical Field

[0001] The invention provides a multifunctional insulating component withstand voltage test device, belonging to the technical field of insulating component batch withstand voltage test. Background Art

[0002] At present, substations at 35kV and below widely use high-voltage switchgear to complete power interruption and output due to its compact equipment and small footprint. Inside the high-voltage switchgear, conductors and equipment casings are insulated and fixed mainly by a large number of support insulators and bushings to ensure safe and reliable transmission of power. Before installing each insulating component, a handover test (AC withstand voltage test) needs to be completed. Currently, there are several problems during the test: First, there are a large number of post insulators. For a newly built high-voltage indoor switchgear, the number of post insulators can reach more than 100, and the number of bushings passing through the cabinet can reach more than 30. It is inefficient to conduct AC withstand voltage tests one by one; there are bolt holes on the upper and lower flanges of the post insulators. Before installation, the test layout requires installing screws on the upper and lower flanges to connect the test leads. The whole process is cumbersome and time-consuming.

[0003] Second, the lightning arrester for the switch cabinet has no base before installation. Due to the structural characteristics of the lightning arrester, the top and bottom are screwed, and it cannot be placed upright for DC withstand voltage testing. Insulating tools such as insulating stools are needed on site to lift the lightning arrester for the test, which increases the complexity of the test and affects the accuracy of the test results.

[0004] Third, the AC withstand voltage test of the wall bushing used in the switch cabinet requires the wall bushing to be raised and fixed, and the high-voltage test line is connected from the terminal block to simulate the running state, and the installation flange is grounded. At present, the on-site handover often uses an insulating stool to lift the wall bushing for testing. The bushing is not stable, and the porcelain bottle contacts the insulating stool, which affects the accuracy of the test; Fourth, the inside of the cabinet bushing is a hollow cavity and is equipped with a shielded wire. When conducting the test, the conductor needs to be filled separately inside the cabinet bushing. Other insulating bushings or insulating stools are needed on site to lift the cabinet bushing for testing. The cabinet bushing is not firmly fixed, and the conductor placement and connection with the shielding wire are unreliable, affecting the accuracy of the test.

[0005] In summary, the above-mentioned acceptance test work of the insulating components and lightning arresters is not only inefficient, but also has safety and accuracy issues during the test process. There is an urgent need for a test device that can improve the current operating method. Summary of the invention

[0006] In order to solve the above technical problems, the present invention proposes a multifunctional insulating component withstand voltage test device.

[0007] The technical solution adopted by the present invention is: a multifunctional insulating component withstand voltage test device, comprising a conductive platform base, a plurality of post insulator withstand voltage test modules are arranged on the platform base, each post insulator withstand voltage test module comprises a post insulator placement slot, a thimble base is fixed in each post insulator placement slot, and a grounding status indicator light is arranged on one side of each post insulator placement slot; A grounding current detection circuit and a support spring are arranged below the ejector base, one end of the support spring is fixed to the bottom surface of the platform base, the grounding current detection circuit includes a normally open contact and a normally closed contact, the other end of the support spring is connected to one end of an inclined surface, a normally open contact is arranged above the other end of the inclined surface, a normally closed contact is also arranged on the other end of the inclined surface below the normally open contact, a fulcrum is arranged in the middle of the inclined surface, the ejector base is connected to the normally closed contact through rigid metal, the normally open contact is connected to the grounding status indicator light through a wire, and the other end of the grounding status indicator light is connected to the platform base.

[0008] Furthermore, a current transformer for small signal detection is provided at the position where the ejector base is placed on the platform chassis.

[0009] Furthermore, an insulating control box is installed at the bottom of the platform chassis, and a signal processing module and a wireless module are fixed in the control box. The signal processing module includes a signal conditioning circuit and an isolation circuit. The signal of the current transformer is transmitted to the wireless module through the signal conditioning circuit, and the signal of the ground current detection loop is transmitted to the wireless module through the isolation circuit. The wireless module realizes wireless data transmission with the wireless network card of the host computer.

[0010] Furthermore, the host computer includes a display screen and a host computer, the host computer is embedded with a current waveform analysis threshold diagnosis algorithm, the current waveform analysis threshold diagnosis algorithm performs signal analysis through wavelet packets, marks abnormal discharge characteristic signals and mutation waveforms, and displays them on the display screen.

[0011] Furthermore, during the test, the post insulators are placed in the post insulator placement grooves in sequence, and a plurality of post insulators are connected in series using high-voltage leads and then connected to an external AC withstand voltage device.

[0012] Furthermore, the high-voltage lead includes a reverse-tooth clamp and a test line. The reverse-tooth clamp includes two hinged connecting rods, one of which is provided with reverse teeth at the bottom for cooperating with the flange bolt holes on the support insulator, and a spring is connected between the two connecting rods. Both ends of the test line are provided with connecting rings, which are sleeved on the connecting rods.

[0013] Furthermore, the platform base is also provided with a plurality of lightning arrester fixing bolt holes for fixing the lightning arrester.

[0014] Furthermore, a bracket fixing groove is provided on the platform base, and the bracket fixing groove is used to install a conductive bushing bracket. The bushing bracket is provided with at least two bushing fixing grooves for placing a cabinet bushing and a wall bushing respectively.

[0015] Furthermore, a copper busbar conductor is placed inside the cabinet bushing, and the shielding wire inside the cabinet bushing is plugged into the shielding wire slot of the copper busbar conductor.

[0016] Furthermore, a bolt hole is provided on the sleeve fixing groove.

[0017] Compared with the prior art, the present invention has the following beneficial effects: the present invention integrates the withstand voltage test functions of various insulating parts through a detachable design, which facilitates on-site test personnel to quickly build a test environment, assists in judging abnormalities and faults, and accurately completes withstand voltage tests in batches with high efficiency and safety. 1. The device of the present invention can realize batch withstand voltage test for grounding detection and abnormality identification of post insulators; 2. The high-voltage test line with reverse tooth clamp proposed by the present invention can realize rapid wiring when testing batch post insulators; 3. The present invention proposes a detachable casing pressure-resistant support frame with strong compatibility, which is provided with a casing fixing groove and a flange fixing hole, and can realize the test of the wall casing and the cabinet casing; 4. The present invention relates to a platform base compatible with the bolt holes of medium and low voltage lightning arresters, which can realize the pressure resistance test of the lightning arrester. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below in conjunction with the accompanying drawings: Figure 1 It is a schematic diagram of a platform with grounding status detection of the present invention; Figure 2 This is a schematic diagram of the ejector base grounding detection structure and its lighting circuit; Figure 3 This is the appearance diagram of common post insulators; Figure 4 This is a schematic diagram of the withstand voltage test line; Figure 5 This is a schematic diagram of the withstand voltage test of batch post insulators; Figure 6 This is a common casing appearance diagram; Figure 7 This is a schematic diagram of the pressure test of the wall bushing; Figure 8 This is a schematic diagram of the pressure test of the cabinet bushing; Fig. 9 This is a schematic diagram of the DC withstand voltage test of the arrester; Fig.10This is a schematic diagram of the DC withstand voltage test of common 35kV and below baseless zinc oxide lightning arresters; Fig.11 is the circuit diagram of the device; In the figure: 1-high voltage line support rod; 2-grounding status indicator light; 3-thimble base; 4-platform chassis; 5-moving roller; 6-post insulator placement slot; 7-normally open contact; 8-normally closed contact; 9-fulcrum; 10-support spring; 12-post insulator; 13-post insulator lower flange bolt hole; 14-post insulator upper flange bolt hole; 15-AC withstand voltage device; 16-test line; 17-reverse tooth clamp; 1 8-cabinet bushing; 19-cabinet bushing internal cavity; 20-wall bushing; 21-bushing bracket; 22-bushing fixing slot; 23-bracket fixing slot; 24-copper busbar conductor; 25-wall bushing flange; 26-cabinet bushing flange; 27-lightning arrester; 28-lightning arrester fixing bolt hole; 29-DC withstand voltage device; 30-cabinet bushing shielding wire; 31-shielding wire slot; 32-current transformer; 33-host computer. DETAILED DESCRIPTION

[0019] like Figures 1 to 11 As shown, the present invention provides a multifunctional insulating component withstand voltage test device, including a platform with grounding status detection, a detachable bushing bracket 21 and a host computer 33, wherein the platform can be used to place both the post insulator 12 and the lightning arrester 27, and the withstand voltage test of the post insulator 12 and the lightning arrester 27 can be realized without adding additional fixed objects. At the same time, the bushing bracket 21 can also be installed on the platform to realize the withstand voltage test of the cabinet bushing 18 and the wall bushing 20.

[0020] The platform with grounding detection includes a platform base 4. The platform chassis 4 is made of magnesium-aluminum alloy material with both conductivity and mechanical strength, which serves as the grounding side of the withstand voltage test. A high-voltage wire support rod 1 is fixed on the platform base 4. In this embodiment, the high-voltage wire support rod 1 can be fixed on any corner of the platform base 4; the high-voltage wire support rod 1 is used to support the high-voltage lead wire for the test. Moving rollers 5 are installed at the four corners of the bottom of the platform base 4 to facilitate the movement of the platform in actual use.

[0021] A plurality of post insulator withstand voltage test modules are arranged on the platform base 4, each of which includes a post insulator placement slot 6 for placing a post insulator 12 (ZJ-10Q post insulator can be used), wherein the upper and lower ends of the post insulator 12 are respectively provided with a post insulator upper flange bolt hole 14 and a post insulator lower flange bolt hole 13, each post insulator placement slot 6 is fixed with a thimble base 3, the thimble base 3 has a grounding detection function, which is used to realize the grounding of the post insulator lower flange bolt, and each post insulator placement slot 6 is provided with a grounding status indicator 2 on one side, which is used to display the post insulator 12 grounding state; a grounding current detection circuit and a support spring 10 are provided below the ejector base 3, one end of the support spring 10 is fixed to the bottom surface of the platform base 4, the grounding current detection circuit includes a normally open contact 7 and a normally closed contact 8, the other end of the support spring 10 is connected to one end of an inclined surface, a normally open contact 7 is provided above the other end of the inclined surface, a normally closed contact 8 is also provided on the other end of the inclined surface below the normally open contact 7, a fulcrum 9 is provided in the middle of the inclined surface, the ejector base 3 is connected to the normally closed contact 8 through a rigid metal, the normally open contact 7 is connected to the grounding state indicator light 2 through a wire, and the other end of the grounding state indicator light 2 is connected to the platform base 4, and its detection principle is as follows Figure 2 As shown, when the post insulator 12 is placed at the position corresponding to the ejector base 3, the ejector will press down the support spring 10 after it is in good contact with the inside of the bolt hole 13 of the lower flange of the post insulator. Under the action of the fulcrum 9, the normally closed contact 8 will open, the normally open contact 7 will close, and the grounding status indicator light 2 will be grounded to the ejector through the normally open contact 7 to form a conductive circuit. The grounding status indicator light 2 lights up, indicating that the post insulator 12 is well grounded. The lighting circuit is as shown in FIG. Figure 2 (b) Each ground detection loop is placed inside the platform chassis 4.

[0022] The high-voltage lead consists of two parts, one is the conventional test line 16, and the other is the reverse-tooth clamp 17. The reverse-tooth clamp 17 includes two hinged connecting rods, one of which is provided with reverse teeth at the bottom for cooperating with the flange bolt hole 14 on the post insulator. A spring is also connected between the two connecting rods. Both ends of the test line 16 are provided with connecting rings, which are sleeved on the connecting rods. The reverse-tooth clamp 17 is extended through the equidistant test line, and the spacing corresponds to the distance of the ejector base 3 on the platform chassis 4. This design is to engage the internal thread of the flange bolt hole 14 on the post insulator to ensure that the test line 16 can be firmly connected to the post insulator 12. The reverse-tooth clamp 17 is in a normally open state. The compression of the spring on the reverse-tooth clamp 17 will close the opening. After inserting it into the flange bolt hole 14 on the post insulator, the spring on the reverse-tooth clamp 17 is loosened to complete the connection of the test line 16. The entire batch withstand voltage test function is as follows: Figure 5As shown. Multiple post insulators 12 are placed in the corresponding post insulator placement grooves 6, and the bolt holes 13 of the lower flange of each post insulator are matched with the thimble base 3, and the reverse tooth clamps 17 are inserted into the bolt holes 14 of the upper flange of each post insulator, and the two ends of the test line 16 are respectively connected to the two reverse tooth clamps 17, and the above connection method is used until all the bolt holes 14 of the upper flange of the post insulator are connected to the test line 16, and finally the test line 16 is connected to the external AC withstand voltage device 15 through the high-voltage line support rod 1, so as to realize the batch withstand voltage test of the post insulators 12.

[0023] Specifically, in this embodiment, 10 post insulator withstand voltage test modules are arranged on the platform base 4, and withstand voltage tests can be performed on 10 post insulators 12 at the same time.

[0024] The platform chassis 4 of the present invention is provided with a current transformer 32 for small signal detection at the position where the ejector base 3 is placed, which plays the role of assisting in fixing the support insulator 12 and detecting the current signal. A signal processing and wireless module is arranged at the bottom of the platform chassis 4. The current transformer 32 is transmitted to the wireless module through the signal conditioning circuit, and the grounding detection state quantity is transmitted to the wireless module through the isolation circuit, wherein the wireless module adopts a Wi-Fi module (ESP8266) to wirelessly send the signal of the current transformer 32 and the grounding detection state signal to the host computer 33. The host computer 33 is provided with a display screen, and a current waveform analysis threshold diagnosis algorithm is embedded in the host computer 33. The current waveform analysis threshold diagnosis algorithm performs signal analysis through wavelet packets, marks abnormal discharge characteristic signals and sudden change waveforms, and displays them on the display screen, and the display screen can also display the node status and current status.

[0025] During the withstand voltage test, the detection current of the current transformer 32 is wirelessly sent to the host computer 33 through the signal conditioning circuit. The host computer 33 analyzes the wave characteristics and threshold value of the detection current signal, issues an abnormal alarm and fault identification for the support insulator corresponding to the abnormal signal, and quickly finds the abnormal location of the 10 support insulators 12. The host computer 33 receives the grounding status at the same time, and the display screen displays the grounding status and current status at the same time. The specific working principle is as follows: Fig.11 shown.

[0026] The device of the present invention can also realize the AC withstand voltage test of bushings, including the test of the cabinet bushing 18 and the wall bushing 20. Specifically, the present invention designs a bushing bracket 21 that is compatible with the cabinet bushing 18 and the wall bushing 20, and is made of magnesium-aluminum alloy conductor material. The upper part of the bushing bracket 21 is used to place the bushing through a bushing fixing groove 22, and bolt holes are designed to reinforce the bushing. The width of the groove has an elastic margin to adapt to different bushing flange sizes; the lower part of the bushing bracket 21 is connected and fixed to the platform chassis 4 through a bracket fixing groove 23 to achieve grounding of the wall bushing flange 25 and the cabinet bushing flange 26. The bushing bracket 21 and the platform chassis 4 are designed to be detachable. Before doing the bushing test, the bushing bracket 21 can be inserted into the bracket fixing groove 23 opened on the platform chassis 4 to complete the assembly. The corresponding AC withstand voltage test of the wall bushing 20 is as follows Figure 7 As shown. The cabinet bushing 18 has a hollow interior with a shielding wire 30 in the middle, so an external copper bus conductor 24 is required as the high-voltage end. At the same time, the shielding wire 30 is directly plugged together through the shielding wire slot 31 provided by the copper bus conductor 24. The connection method is as follows: Figure 8 As shown in the table, the AC withstand voltage test is as follows: Fig. 9 shown.

[0027] The platform base 4 is also provided with a plurality of commonly used arrester fixing bolt holes 28 for voltage levels of 35kV and below, which can be used to fix the zinc oxide arrester 27 without a base and with upper and lower screw structures. The arrester 27 only needs to be installed on the arrester fixing bolt hole 28 of the corresponding size. After the test is passed, it can be installed again, which can fully simulate the normal operating electrical state and position posture. The arrester fixing bolt hole 28 is directly metallically short-circuited with the platform base 4 to achieve good grounding of the lower flange of the arrester 27. The DC withstand voltage test of the improved arrester 27 is shown in the figure. Fig.10 Screw one end of the arrester 27 into the arrester fixing bolt hole 28, connect the other end of the arrester 27 to the DC withstand voltage device 29 through the test line, and power on to perform the withstand voltage test on the arrester 27.

[0028] In summary, the existing post insulators are relatively time-consuming and laborious to test one by one. The upper and lower flanges need to be screwed together to connect the high-voltage line and the grounding wire. The withstand voltage test before installation usually uses a simple bare copper wire to plug into the lower flange bolt hole so that the insulating post can stand upright. This method cannot ensure that each lower flange is reliably grounded. The device of the present invention can complete the batch insulation post withstand voltage test on the basis of ensuring the accuracy of the test electrical characteristics.

[0029] The existing switch cabinet arrester DC withstand voltage test does not have a universal and suitable base for support. Generally, it is assisted by insulating tools such as insulating stools on site. The arrester cannot stand upright and can only be placed horizontally for testing, which affects the detection of the arrester leakage current. The device of the present invention can stabilize the arrester and is compatible with the bolt parameters of most manufacturers.

[0030] The AC withstand voltage test of the wall bushing and cabinet bushing used in the existing switch cabinet requires the bushing to be raised and fixed. Currently, there is no suitable support mechanism to firmly support the bushing, and there is no suitable conductor to simulate the high-voltage live body in the middle of the cabinet bushing. The device of the present invention can conveniently raise and fix the bushing to ensure a safe insulation distance, and the electric field distribution inside the cabinet bushing can approximately simulate the operating state (convenient for connecting shielded wires).

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multifunctional insulating component withstand voltage test device, comprising a conductive platform base (4), characterized in that: A plurality of post insulator withstand voltage test modules are arranged on the platform base (4), each post insulator withstand voltage test module comprises a post insulator placement slot (6), a pin base (3) is fixed in each post insulator placement slot (6), and a grounding status indicator light (2) is arranged on one side of each post insulator placement slot (6); A ground current detection circuit and a support spring (10) are provided below the ejector base (3); one end of the support spring (10) is fixed to the bottom surface of the platform base (4); the ground current detection circuit comprises a normally open contact (7) and a normally closed contact (8); the other end of the support spring (10) is connected to one end of an inclined surface; the normally open contact (7) is provided above the other end of the inclined surface; a normally closed contact (8) is further provided on the other end of the inclined surface below the normally open contact (7); a fulcrum (9) is provided in the middle of the inclined surface; the ejector base (3) is connected to the normally closed contact (8) through a rigid metal connection; the normally open contact (7) is connected to a ground status indicator light (2) through a wire; and the other end of the ground status indicator light (2) is connected to the platform base (4).

2. A multifunctional insulating component withstand voltage test device according to claim 1, characterized in that: Current transformers (32) for small signal detection are provided at the locations of the platform chassis (4) where the ejector base (3) is placed.

3. A multifunctional insulating component withstand voltage test device according to claim 2, characterized in that: An insulating control box is installed at the bottom of the platform chassis (4), and a signal processing module and a wireless module are fixed in the control box. The signal processing module includes a signal conditioning circuit and an isolation circuit. The signal of the current transformer (32) is transmitted to the wireless module through the signal conditioning circuit, and the signal of the ground current detection loop is transmitted to the wireless module through the isolation circuit. The wireless module and the wireless network card of the host computer (33) realize wireless data transmission.

4. A multifunctional insulating component withstand voltage test device according to claim 3, characterized in that: The host computer (33) comprises a display screen and a host computer. The host computer is embedded with a current waveform analysis threshold diagnosis algorithm. The current waveform analysis threshold diagnosis algorithm performs signal analysis through wavelet packets, marks abnormal discharge characteristic signals and sudden change waveforms, and displays them on the display screen.

5. A multifunctional insulating component withstand voltage test device according to any one of claims 1 to 4, characterized in that: During the test, the post insulators (12) are placed in the post insulator placement groove (6) in sequence, and a plurality of post insulators (12) are connected in series using high-voltage leads and then connected to an external AC withstand voltage device (15).

6. A multifunctional insulating component withstand voltage test device according to claim 5, characterized in that: The high-voltage lead comprises an inverted tooth clamp (17) and a test line (16), wherein the inverted tooth clamp (17) comprises two hinged connecting rods, wherein the bottom of one of the connecting rods is provided with inverted teeth for cooperating with flange bolt holes (14) on a support insulator, and a spring is connected between the two connecting rods, and both ends of the test line (16) are provided with connecting rings, which are sleeved on the connecting rods.

7. A multifunctional insulating component withstand voltage test device according to claim 5, characterized in that: The platform base (4) is also provided with a plurality of lightning arrester fixing bolt holes (28) for fixing the lightning arrester (27).

8. A multifunctional insulating component withstand voltage test device according to claim 6 or 7, characterized in that: The platform base (4) is also provided with a bracket fixing groove (23), the bracket fixing groove (23) being used to install a conductive bushing bracket (21), and the bushing bracket (21) is provided with at least two bushing fixing grooves (22) for respectively placing a cabinet bushing (18) and a wall bushing (20).

9. A multifunctional insulating component withstand voltage test device according to claim 8, characterized in that: A copper busbar conductor (24) is placed inside the cabinet bushing (18), and a shielding wire (30) inside the cabinet bushing (18) is plugged into a shielding wire slot (31) provided on the copper busbar conductor (24).

10. A multifunctional insulating component withstand voltage test device according to claim 8, characterized in that: The sleeve fixing groove (22) is provided with a bolt hole.

Images