A calibration bench for the full inspection and acceptance test of high-voltage instrument transformers

Abstract

The present invention discloses a calibration bench for the full inspection and acceptance test of high-voltage transformers, which includes an aluminum profile frame and a transformer calibration station body. The transformer calibration station body is composed of five parts: a transformer conveying unit, a withstand voltage test station, an induction withstand voltage and error test station for voltage transformers, a current error test station, and a functional module. The transformer calibration station body is installed below the aluminum profile frame. The present invention is compatible with a wide variety of transformers. Due to different transformation ratios and manufacturers of different transformers, there are many types of appearance dimensions of transformers. The bench can adaptively connect wires to transformers according to transformers of different dimensions, so as to be compatible with the calibration requirements of different transformers. It can perform many test items. This device can perform all items of the full inspection test and calibration on high-voltage voltage and current transformers after arrival, and the calibration efficiency of the transformers is high. It is applicable to the calibration of high-voltage transformers.

Description

Technical Field

[0001] The present invention relates to the technical field of power metering instrument verification, and specifically provides a verification bench for the full inspection and acceptance test of high-voltage transformers. Background Art

[0002] The demand for high-voltage transformers is increasing with the further expansion of the market, and the verification ability for high-voltage transformers is facing increasing pressure. At present, the verification method for high-voltage transformers is mostly manual verification, with low verification efficiency, backward management and control means, and high learning costs for verification personnel, and a set of safe and effective centralized integrated control scheme has not been formed.

[0003] At the current stage in the industry, high-voltage transformer verification devices generally have problems such as single function, separate sets for various test items, and incomplete equipment configuration functions, resulting in many high-voltage transformer verification institutions not having the complete ability to conduct full inspections on incoming high-voltage transformers. During the test, manual handling work is also required between different detection devices, which will inevitably increase the equipment purchase cost and labor cost. At the same time, manual repeated disconnection and connection are required for the switching between different tests. While the verification efficiency is low, it will inevitably increase the test error rate caused by wiring deviation. In addition, due to manual operation, the learning cost of learning the verification operation specifications by personnel is relatively high. It is necessary to learn 10 test methods for two types of transformers and up to 15 wiring methods. The levels of verification personnel vary, and potential safety hazards in personnel operation will also exist at all times. Summary of the Invention

[0004] The purpose of the present invention is to provide a verification bench for the full inspection and acceptance test of high-voltage transformers to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A verification bench for the full inspection and acceptance test of high-voltage transformers, including an aluminum profile frame and a transformer verification station body. The transformer verification station body is composed of five parts: a transformer conveying unit, a withstand voltage test station, a voltage transformer induced withstand voltage and error test station, a current error test station, and a function module.

[0006] Preferably, the transformer verification station body is installed below the aluminum profile frame, and the bottom of the transformer verification station body is fixed through a base.

[0007] Preferably, the mutual inductor conveying unit is installed below the mutual inductor calibration station body and includes a driving device, a transmission device, a roller conveyor line, a positioning device, and a bottom plate. The bottom plate is installed below the mutual inductor calibration station body. The roller conveyor line is installed on the bottom plate. The transmission device is arranged in the middle of the roller conveyor line and is connected to the driving device. The positioning device is located below the roller conveyor line and is matched with the corresponding positions of the power frequency withstand voltage test station, the induction withstand voltage and error test station for voltage mutual inductors, and the current error test station, and is connected to the driving device. The transmission device can adopt a lead screw or synchronous belt wheel transmission method.

[0008] Preferably, the insulation resistance and power frequency withstand voltage test station includes a power frequency withstand voltage test cylinder mounting plate, a power frequency withstand voltage test guide rod cylinder, an insulator, a power frequency withstand voltage test pressure connector, a primary terminal of the mutual inductor, and a secondary and ground pressure connector. The power frequency withstand voltage test cylinder mounting plate is fixedly connected to the top of the aluminum profile frame. The power frequency withstand voltage test guide rod cylinder is fixedly connected to the power frequency withstand voltage test cylinder mounting plate. The insulator is fixedly connected between the power frequency withstand voltage test guide cylinder and the insulation resistance and power frequency withstand voltage test pressure connector. The primary terminal of the mutual inductor is connected to the power frequency withstand voltage test guide rod cylinder.

[0009] Preferably, the secondary and ground pressure connector of the mutual inductor is composed of a guide rod cylinder, a guide rod, and a secondary side contact terminal of the mutual inductor.

[0010] Preferably, the induction withstand voltage and error test station for voltage mutual inductors includes an induction withstand voltage and error test cylinder mounting plate, an induction withstand voltage and error test guide cylinder, an induction withstand voltage and error test switching pressure connector, and a primary terminal of the mutual inductor. The induction withstand voltage and error test cylinder mounting plate is fixedly connected to the top of the aluminum profile frame. The induction withstand voltage and error test guide cylinder is fixedly connected to the induction withstand voltage and error test cylinder mounting plate. The insulator (223 is fixedly connected between the induction withstand voltage and insulation test guide cylinder and the induction withstand voltage and insulation test pressure connector. The primary terminal of the mutual inductor is connected to the induction withstand voltage and error test guide rod cylinder.

[0011] Preferably, the current error calibration station includes a current error calibration station cylinder mounting plate, a current error calibration station guide cylinder, a primary large current wire connection terminal, a primary crimping elastic pressure connector, and a secondary elastic pressure connector. The current error calibration station cylinder mounting plate is fixedly connected to the top of the aluminum profile frame. The current error calibration station guide cylinder is connected to the current error calibration station cylinder mounting plate. The primary large current wire connection terminal is connected to the current error calibration station guide cylinder. The primary crimping elastic pressure connector is connected to the primary large current wire connection terminal.

[0012] Preferably, the functional module consists of a switching control module, an error switching module, a contactor from the programmed power source to the self-boosting standard voltage transformer, a contactor from the programmed power source to the excitation characteristic tester, and a module power supply.

[0013] The present invention provides a calibration bench for the full inspection and acceptance test of high-voltage transformers. It has the following beneficial effects:

[0014] (1) The present invention is compatible with a wide variety of transformers: Due to different transformation ratios and manufacturers of different transformers, there are many types of appearance dimensions of transformers. The bench can adaptively wire the transformers according to the transformers of different dimensions, so as to be compatible with the calibration requirements of different transformers.

[0015] (2) The present invention can conduct a large number of test items. This device can perform all the items of the full inspection test after the arrival of high-voltage voltage and current transformers.

[0016] (3) The present invention has a high efficiency in transformer calibration. The calibration method of this device has automatic transfer, automatic conveying, automatic connection and disconnection of wires, automatic switching of tests, and automatic uploading of test data, so the efficiency of transformer calibration is high.

[0017] (4) The present invention has high test reliability. Compared with the traditional calibration method, this test device does not require manual participation throughout the process, which can ensure that the wiring of each test is reliable and eliminate the errors caused by manual participation;

[0018] (5) The present invention has a high reuse rate of calibration equipment. Compared with the traditional calibration method, this test device classifies different tests according to the combination of equipment participation, improves the reuse rate of equipment, and reduces the repeated purchase rate of equipment; BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional structure diagram of the transformer calibration station body of the present invention;

[0020] Figure 2 It is a structure diagram of the transformer calibration station body and the aluminum profile frame of the present invention;

[0021] Figure 3 It is a three-dimensional rear view of the transformer calibration station body of the present invention;

[0022] Figure 4 It is a partial structure diagram of the current error calibration station of the present invention.

[0023] In the figure: 1 aluminum profile frame, 2 main body of mutual inductor calibration station, 21 mutual inductor conveying unit, 22 your test station, 221 installation plate for power frequency withstand voltage test cylinder, 222 rod-type cylinder for power frequency withstand voltage test, 223 insulator, 224 pressure connector for power frequency withstand voltage test, 225 primary terminal of mutual inductor, 226 secondary and ground pressure connector, 23 induction withstand voltage and error test station for voltage transformer, 231 installation plate for induction withstand voltage and error test cylinder, 232 pneumatic cylinder for induction withstand voltage and error test, 233 switching pressure connector for induction withstand voltage and error test, 234 primary terminal of mutual inductor, 24 current error calibration station, 241 installation plate for current error calibration station cylinder, 242 pneumatic cylinder for current error calibration station, 243 connection terminal for primary large current wire, 244 elastic pressure connector for primary crimping, 25 functional module, 251 switching control module, 252 error switching module, 253 contactor from program-controlled source to self-boosting standard voltage transformer, 254 contactor from program-controlled source to excitation characteristic tester, 255 module power supply. Specific implementation manner

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0025] As Figures 1-4As shown in the figure, the present invention provides a technical solution: a calibration bench for the full inspection and acceptance test of high-voltage transformers, including an aluminum profile frame 1 and a transformer calibration station body 2. The transformer calibration station body 2 is composed of five parts: a transformer conveying unit 21, a withstand voltage test station 22, a voltage transformer induced withstand voltage and error test station 23, a current error test station 24, and a functional module 25. The transformer calibration station body 2 is installed below the aluminum profile frame 1, and the bottom of the transformer calibration station body 2 is fixed by a base. The transformer conveying unit 21 is installed below the transformer calibration station body 2 and includes a driving device, a transmission device, a roller line, a positioning device, and a bottom plate. The bottom plate is installed below the transformer calibration station body 2 of the machine, the roller line is installed on the bottom plate, the transmission device is arranged in the middle of the roller line, the transmission device is connected to the driving device, the positioning device is located below the roller line, and is matched with the corresponding positions of the power frequency withstand voltage test station 22, the voltage transformer induced withstand voltage and error test station 23, and the current error test station 24, and is connected to the driving device. The transmission device can adopt a screw or synchronous belt wheel transmission method. The insulation resistance and power frequency withstand voltage test station 22 includes a power frequency withstand voltage test cylinder mounting plate 221, a power frequency withstand voltage test guide rod cylinder 222, an insulator 223, a power frequency withstand voltage test pressure joint 224, a transformer primary terminal 225, and a secondary and ground pressure joint 226. The power frequency withstand voltage test cylinder mounting plate 221 is fixedly connected to the top of the aluminum profile frame 1, the power frequency withstand voltage test guide rod cylinder 222 is fixedly connected to the power frequency withstand voltage test cylinder mounting plate 221, the insulator 223 is fixedly connected between the power frequency withstand voltage test guide cylinder 222 and the insulation resistance and power frequency withstand voltage test pressure joint 224, the transformer primary terminal 225 is connected to the power frequency withstand voltage test guide rod cylinder 222, and the transformer secondary and ground pressure joint 226 is composed of a guide rod cylinder, a guide rod, and a transformer secondary side contact terminal. The voltage transformer induced withstand voltage and error test station 23 includes an induced withstand voltage and error test cylinder mounting plate 231, an induced withstand voltage and error test guide cylinder 232, an induced withstand voltage and error test switching pressure joint 233, and a transformer primary terminal 234. The induced withstand voltage and error test cylinder mounting plate 231 is fixedly connected to the top of the aluminum profile frame 1, the induced withstand voltage and error test guide cylinder 232 is fixedly connected to the induced withstand voltage and error test cylinder mounting plate 231, the insulator 223 is fixedly connected between the induced withstand voltage and insulation test guide cylinder 232 and the induced withstand voltage and insulation test pressure joint 224, and the transformer primary terminal 225 is connected to the induced withstand voltage and error test guide rod cylinder 232. The current error calibration station 24 includes a current error calibration station cylinder mounting plate 241, a current error calibration station guide cylinder 242, a primary large current wire connection terminal 243, a primary crimping elastic pressure joint 244, and a secondary elastic pressure joint 245. The current error calibration station cylinder mounting plate 241 is fixedly connected to the top of the aluminum profile frame 1,The pneumatic cylinder 242 at the current error verification station is connected to the cylinder mounting plate 242 at the current error verification station. The primary high-current wire connection terminal 243 is connected to the pneumatic cylinder 242 at the current error verification station. The primary crimping elastic crimping head 244 is connected to the primary high-current wire connection terminal 243. The functional module 25 consists of a switching control module 251, an error switching module 252, a contactor from the programmed power source to the self-boosting standard voltage transformer 253, a contactor from the programmed power source to the excitation characteristic tester 254, and a module power supply 255.,

[0026] During use, after the transformer under test is transported and positioned at the insulation resistance and power frequency withstand voltage verification station through the air exchange conveying unit, it automatically enters the insulation resistance and power frequency withstand voltage test process. After the corresponding wiring device operates to complete the wiring, the insulation resistance tester automatically measures the insulation resistance of the transformer under test. After the insulation resistance test is completed, it enters the power frequency withstand voltage test process. First, it conducts the test from primary to secondary and ground. After the test station boosts the voltage to the specified voltage at the first stage, the test station collects the leakage current and uploads the test results to the host computer for judgment. Then it enters the process of secondary to ground, boosts the voltage of the secondary of the transformer, the test station collects the leakage current, and uploads the test results to the host computer for judgment. After the test is completed, the wiring at the station is reset. The transformer under test is transported and positioned at the induction withstand voltage and voltage error test station by the transformer conveying unit. After the transformer under test reaches the induction withstand voltage and error test station, it first enters the induction withstand voltage test process. The corresponding wiring device operates to complete the wiring of the transformer. After the test station boosts the voltage to the specified voltage at the first stage, the test station collects the leakage current and uploads the test results to the host computer for judgment. Then it enters the basic error test of the voltage transformer. When the error test of the tested voltage transformer is qualified, it automatically enters the excitation characteristic test process. The induction withstand voltage and error test rod-type cylinder controls the raising of the primary terminal, making the primary of the transformer in an open state. The host computer sends an instruction to the excitation characteristic tester, and the excitation characteristic tester applies the rated secondary power frequency voltage to the secondary winding. After the test is completed, the wiring at the station is reset. After all the tests of the voltage transformer are completed, the transformer flows out of the test bench through the transformer conveying unit.

Claims

1. A calibration bench for the full inspection and acceptance test of high-voltage instrument transformers, comprising an aluminum profile frame (1) and an instrument transformer calibration station body (2), characterized in that: The mutual inductor calibration station body (2) includes a mutual inductor conveying unit (21), an insulation resistance and power frequency withstand voltage test station (22), a voltage mutual inductor induced withstand voltage and error test station (23), a current error test station (24), and a functional module (25); The mutual inductor calibration station body (2) is installed below the aluminum profile frame (1), and the bottom of the mutual inductor calibration station body (2) is fixed through a base; The mutual inductor conveying unit (21) is installed below the mutual inductor calibration station body (2), and includes a driving device, a transmission device, a roller line, a positioning device, and a bottom plate. The bottom plate is installed below the mutual inductor calibration station body (2) of the machine. The roller line is installed on the bottom plate. The transmission device is arranged in the middle of the roller line and is connected to the driving device. The positioning device is located below the roller line and cooperates with the corresponding positions of the insulation resistance and power frequency withstand voltage test station (22), the voltage mutual inductor induced withstand voltage and error test station (23), and the current error test station (24), and is connected to the driving device. The transmission device can adopt a lead screw or synchronous belt wheel transmission method; The insulation resistance and power frequency withstand voltage test station (22) includes a power frequency withstand voltage test cylinder mounting plate (221), a power frequency withstand voltage test guide rod cylinder (222), an insulator (223), an insulation resistance and power frequency withstand voltage test pressure joint (224), a mutual inductor primary terminal (225), and a secondary and ground pressure joint (226). The power frequency withstand voltage test cylinder mounting plate (221) is fixedly connected to the top of the aluminum profile frame (1). The power frequency withstand voltage test guide rod cylinder (222) is fixedly connected to the power frequency withstand voltage test cylinder mounting plate (221). The insulator (223) is fixedly connected between the power frequency withstand voltage test guide rod cylinder (222) and the insulation resistance and power frequency withstand voltage test pressure joint (224). The mutual inductor primary terminal (225) is connected to the power frequency withstand voltage test guide rod cylinder (222); The secondary and ground pressure joint (226) consists of a guide rod cylinder, a guide rod, and a mutual inductor secondary side contact terminal.

2. The calibration bench for the full inspection and acceptance test of high-voltage instrument transformers according to claim 1, wherein: The voltage mutual inductor induced withstand voltage and error test station (23) includes an induced withstand voltage and error test cylinder mounting plate (231), an induced withstand voltage and error test air guide cylinder (232), an induced withstand voltage and error test switching pressure joint (233), and a mutual inductor primary terminal (225). The induced withstand voltage and error test cylinder mounting plate (231) is fixedly connected to the top of the aluminum profile frame (1). The induced withstand voltage and error test air guide cylinder (232) is fixedly connected to the induced withstand voltage and error test cylinder mounting plate (231). The insulator (223) is fixedly connected between the induced withstand voltage and error test air guide cylinder (232) and the insulation resistance and power frequency withstand voltage test pressure joint (224). The mutual inductor primary terminal (225) is connected to the induced withstand voltage and error test air guide cylinder (232).

3. The calibration bench for the full inspection and acceptance test of high-voltage instrument transformers according to claim 1, wherein: The current error test station (24) includes a cylinder mounting plate (241) for current error verification station, a pneumatic cylinder (242) for current error verification station, a primary high-current wire connection terminal (243), a primary crimping elastic crimping head (244) and a secondary elastic crimping head (245). The cylinder mounting plate (241) for current error verification station is fixedly connected to the top of the aluminum profile frame (1). The pneumatic cylinder (242) for current error verification station is connected to the cylinder mounting plate (241) for current error verification station. The primary high-current wire connection terminal (243) is connected to the pneumatic cylinder (242) for current error verification station. The primary crimping elastic crimping head (244) is connected to the primary high-current wire connection terminal (243).

4. A verification table for the full inspection and acceptance test of high-voltage instrument transformers according to claim 1, characterized in that: The functional module (25) consists of a switching control module (251), an error switching module (252), a contactor from the programmed power source to the self-boosting standard voltage transformer, a contactor from the programmed power source to the excitation characteristic tester, and a module power supply (255).

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