No-load test system and method for identifying turn-to-turn short circuit of transformer

Abstract

The invention discloses a no-load test system and method for identifying transformer turn-to-turn short circuit, and the system comprises a power module which is used for outputting 0-400V AC voltage; the power supply module outputs alternating current voltage of 0-400V to the measurement module, and the alternating current voltage is used for outputting the alternating current voltage to the low-voltage side of the transformer and detecting the no-load current of the transformer; the measuring module transmits the detected no-load current to the central processing unit module, the central processing unit module is used for comparing the no-load current with no-load current in a transformer technical parameter table, if the no-load current is larger than the no-load current in the transformer technical parameter table, the distribution transformer is judged to be unqualified, and if the no-load current is larger than the no-load current in the transformer technical parameter table, the distribution transformer is judged to be unqualified. Otherwise, determining that the product is qualified. According to the technical scheme of the invention, the safety of first-aid repair workers is improved, the danger caused by blind trial delivery is reduced, and the safety production management level of a center is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of circuit testing technology, and in particular to a system and method for an unloaded test to identify inter-turn short circuits in transformers. Background Technology

[0002] In the field of power distribution fault repair, inter-turn short circuit faults in distribution transformers are a common type of fault. Existing insulation testing instruments cannot detect whether an inter-turn short circuit fault has occurred in a transformer. The only way to determine whether an inter-turn short circuit has occurred is by performing a no-load test on the transformer and contacting the transformer manufacturer for on-site testing.

[0003] Performing no-load testing on transformers is a relatively direct method for fault analysis on-site. This involves disconnecting the loads on both sides of the distribution transformer and then testing the high-voltage switch without load. If a trip occurs, the transformer is considered faulty and needs to be replaced. However, this operation carries significant safety risks and could potentially cause personal injury and power grid accidents. Therefore, grassroots distribution maintenance personnel urgently need more professional methods to handle such faults, improve the speed of on-site fault response, and enhance the safety of emergency repair operations. Summary of the Invention

[0004] The technical solution of the present invention to solve the above-mentioned technical problems is to provide a no-load test system for identifying inter-turn short circuits in transformers, comprising:

[0005] Power supply module, used to output AC voltage of 0-400V;

[0006] The measurement module is provided with a power supply module that outputs an AC voltage of 0-400V to the measurement module for outputting to the low-voltage side of the transformer and detecting the no-load current of the transformer.

[0007] The central processing unit module transmits the detected no-load current to the central processing unit module. The central processing unit module compares the no-load current with the no-load current in the transformer technical parameter table. If the no-load current is greater than the no-load current in the distribution transformer technical parameter table, the distribution transformer is determined to be unqualified; otherwise, it is qualified.

[0008] Furthermore, the AC voltage provided by the power module is industrial frequency AC power.

[0009] Furthermore, the central processing unit module includes a data storage device and a display for storing measurement data and displaying measurement results.

[0010] Furthermore, the power module includes a voltage adjustment button for adjusting the output voltage.

[0011] Furthermore, the central processing unit module calculates the value based on the product of the rated current on both sides of the distribution transformer and the percentage of the no-load current. If the measured no-load current is greater than the calculated value, the transformer is deemed unqualified.

[0012] To address the aforementioned technical problems, this invention also proposes a no-load test method for identifying inter-turn short circuits in transformers, comprising the following steps:

[0013] A rated voltage of 400V is input between phases on the low-voltage side of the transformer;

[0014] The measurement module detects the no-load current of the transformer;

[0015] The no-load current is compared with the no-load current in the distribution transformer technical parameter table. If the no-load current is greater than the no-load current in the transformer technical parameter table, the transformer is deemed unqualified; otherwise, it is qualified.

[0016] The technical solution of this invention involves inputting a rated voltage of 400V to both sides of the transformer and detecting the no-load current of the transformer through a measuring module. The detected no-load current is compared with the no-load current in the distribution transformer technical parameter table to determine whether a short-circuit fault has occurred. The detection method is safe and simple. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the no-load test system for identifying inter-turn short circuits in transformers as described in this invention.

[0019] label name label name 10 Power module 30 Measurement module 20 Central Processing Unit Module Detailed Implementation

[0020] This invention proposes a no-load test method for identifying inter-turn short circuits in transformers, aiming to provide a safe method for detecting inter-turn short circuit faults in transformers.

[0021] The no-load test system for identifying inter-turn short circuits in transformers proposed in this invention will be described below in specific embodiments:

[0022] Example 1:

[0023] In the technical solution of this embodiment, such as Figure 1As shown, a no-load test system for identifying inter-turn short circuits in transformers includes:

[0024] Power module 10 is used to output AC voltage of 0-400V;

[0025] Measurement module 30, the power module 10 outputs 0-400V AC voltage to the measurement module 30, for output to the low voltage side of the transformer, and to detect the no-load current of the transformer;

[0026] The central processing unit module 20 transmits the detected no-load current to the measurement module 30. The central processing unit module 30 compares the no-load current with the no-load current in the transformer technical parameter table. If the no-load current is greater than the no-load current in the distribution transformer technical parameter table, the distribution transformer is determined to be unqualified; otherwise, it is qualified.

[0027] Furthermore, the AC voltage provided by the power module 10 is industrial frequency AC power.

[0028] Understandably, power module 10 provides power to central processing unit module 20.

[0029] Furthermore, the central processing unit module 20 includes a data storage device and a display for storing measurement data and displaying measurement results.

[0030] Furthermore, the power module 10 includes a voltage adjustment button for adjusting the output voltage.

[0031] Furthermore, the central processing unit module 20 calculates the value based on the product of the rated current on both sides of the distribution transformer and the percentage of the no-load current. If the measured no-load current is greater than the calculated value, the transformer is deemed unqualified.

[0032] Furthermore, the no-load test system used to identify inter-turn short circuits in transformers also includes a safety protection mechanism to automatically cut off the power supply when an overcurrent condition is detected during the measurement process, ensuring the safety of the operators.

[0033] Understandably, power module 10, as a crucial component of the device, requires an adjustable AC voltage of 0 to 220 volts to supply the transformer under test. Since the inter-turn short circuit conditions of the faulty transformer vary, directly outputting 220V would cause excessive no-load current, triggering the power protection system and impacting equipment lifespan. The DC inverter outputs an adjustable 0-220V AC power supply for the measurement module.

[0034] Measurement module 30: Digital ammeter used to measure no-load current.

[0035] Central processing unit module 20: After receiving the set transformer capacity, the central control unit module 20 measures the value and makes a judgment. If the current exceeds the rated capacity, an alarm will be triggered.

[0036] Beneficial effects: This design improved the safety of emergency repair personnel, reduced the dangers of blindly testing the equipment, significantly enhanced the center's safety production management level, and also improved the ability of front-line staff to analyze and solve problems.

[0037] Example 2:

[0038] A no-load test method for identifying inter-turn short circuits in a transformer includes the following steps:

[0039] A rated voltage of 400V is input between phases on the low-voltage side of the transformer;

[0040] The measurement module detects the no-load current of the transformer;

[0041] The no-load current is compared with the no-load current in the distribution transformer technical parameter table. If the no-load current is greater than the no-load current in the transformer technical parameter table, the transformer is deemed unqualified; otherwise, it is qualified.

[0042] The above description is merely a preferred 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 system for no-load test for identifying transformer turn-to-turn short circuit, characterized in that: include: Power module, used to output 0-400V AC voltage; A measuring module, wherein the power module outputs an AC voltage of 0-400V to the measuring module for outputting to the low-voltage side of the transformer and detecting the no-load current of the transformer; The central processing unit module, the measurement module transmits the detected no-load current to the central processing unit module, and the central processing unit module is used to compare the no-load current with the no-load current in the transformer technical parameter table. If it is greater than the no-load current in the distribution transformer technical parameter table, the distribution transformer is judged to be unqualified, otherwise it is qualified.

2. The system for no-load test for identifying transformer turn-to-turn short circuit according to claim 1, characterized in that: The AC voltage provided by the power module is industrial frequency AC power.

3. The system for no-load test for identifying transformer turn-to-turn short circuit according to claim 4, characterized in that: The central processing unit module includes a data storage device and a display device for storing measurement data and displaying measurement results.

4. The system for no-load test for identifying transformer turn-to-turn short circuit according to claim 1, characterized in that: The power module includes a voltage adjustment button for adjusting the output voltage.

5. The system for no-load test for identifying transformer turn-to-turn short circuit according to claim 1, characterized in that: The central processing unit module obtains a calculated value based on the product of the rated current on both sides of the distribution transformer and the no-load current percentage. If the measured no-load current is greater than the calculated value, the transformer is determined to be unqualified.

6. A method for no-load test for identifying transformer turn-to-turn short circuit, characterized in that: The following steps are involved: The rated voltage between phases of the transformer low voltage side is 400V; The measuring module detects the no-load current of the transformer; Compare the no-load current with the no-load current in the technical parameter table of the distribution transformer. If the no-load current is greater than the no-load current in the technical parameter table of the transformer, the voltage regulator is judged to be unqualified, otherwise it is qualified.

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