Dry-type transformer temperature measurement RTD direct current resistance measuring device

Abstract

The utility model relates to the technical field of transformer temperature measurement, in particular to a dry-type transformer temperature measurement RTD direct current resistance measuring device which comprises a first female connector, a second female connector, a first four-pole double-throw switch, a second four-pole double-throw switch, a test line and external test equipment. One end of the first female connector and one end of the second female connector are respectively connected with an access port of a temperature measurement RTD outgoing line, and the other end of the first female connector and the other end of the second female connector are respectively connected with the input end of the first four-pole double-throw switch. The output end of the first four-pole double-throw switch is connected with the input end of the second four-pole double-throw switch, the output end of the second four-pole double-throw switch is connected with one end of the test line, and the other end of the test line is connected with a measuring port of the external test equipment.

Description

Technical Field

[0001] The utility model relates to the technical field of transformer temperature measurement, in particular to an RTD direct resistance measurement device for measuring temperature of a dry-type transformer. Background Art

[0002] In a hydropower station's power system, the excitation transformer and the auxiliary high-voltage transformer are two key components of the system. These transformers typically utilize a dry, air-cooled design, offering superior safety and environmental performance. Temperature monitoring is crucial to ensure reliable operation of these transformers. Currently, maintenance personnel primarily use digital multimeters for point-to-point measurements, placing the multimeter probes directly on the DB (D-sub) connector pins of the RTD leads. This presents the following challenges: 1. The DB connector pins are small, requiring steady, precise manual operation. 2. Unstable contact between the probes and the pins can cause fluctuations in measurement values, impacting data accuracy. 3. Each phase RTD is typically configured with two sets, one for primary and one for backup, each with two channels. Multiple measurements are required for each transformer, typically taking approximately an hour and significantly extending maintenance cycles. 4. The excitation transformer uses a DB15 connector, while the auxiliary high-voltage transformer uses a DB25 connector. These different pin configurations increase operational complexity and can easily lead to measurement errors. Utility Model Content

[0003] The purpose of this utility model is to provide a dry-type transformer temperature RTD direct resistance measurement device, which significantly improves measurement efficiency and accuracy through a DB15 / 25 female connector and a dual-switch selection system. It shortens the measurement time from 1 hour per unit to 3-5 minutes, improving efficiency by approximately 95%. The platform design is simple and portable, does not require an external power supply, is applicable to different types of transformers, simplifies the operating process, reduces the risk of human error, and improves data reliability.

[0004] The embodiments of the present invention are achieved through the following technical solutions:

[0005] A dry-type transformer temperature measurement RTD direct resistance measurement device includes: a first female interface, a second female connector, a first four-pole double-throw switch, a second four-pole double-throw switch, a test line, and an external test device; one end of the first female interface and one end of the second female connector are respectively connected to the access port of the temperature measurement RTD lead-out line, the other end of the first female interface and the other end of the second female connector are respectively connected to the input end of the first four-pole double-throw switch, the output end of the first four-pole double-throw switch is connected to the input end of the second four-pole double-throw switch, the output end of the second four-pole double-throw switch is connected to one end of the test line, and the other end of the test line is connected to the measurement port of the external test device.

[0006] Optionally, a temperature compensation device is further included, which is fixedly arranged at the temperature measuring RTD. The temperature compensation device is integrated with a temperature sensor to detect the ambient temperature of the temperature measuring RTD.

[0007] Optionally, the temperature measuring RTD is specifically divided into a first temperature measuring RTD and a second temperature measuring RTD; wherein, the first temperature measuring RTD is fixedly set at the factory high-voltage transformer winding, and the second temperature measuring RTD is fixedly set at the excitation transformer winding, and the access port of the first temperature measuring RTD lead-out line corresponds to the first female interface, and the access port of the second temperature measuring RTD lead-out line corresponds to the second female interface.

[0008] Optionally, the external test equipment specifically includes a digital-to-analog conversion chip, a main control chip and a liquid crystal display screen, and the free end of the test line, the digital-to-analog conversion chip, the main control chip and the liquid crystal display screen are connected in sequence.

[0009] Optionally, the external testing device further includes a crystal oscillator circuit, and the crystal oscillator circuit is connected to the main control chip.

[0010] Optionally, the external testing device further includes a reset circuit, and the reset circuit is connected to the main control chip.

[0011] Optionally, the external testing device further includes a test button, and the test button is connected to the main control chip.

[0012] The technical solution of the embodiment of the utility model has at least the following advantages and beneficial effects:

[0013] This utility model significantly improves measurement efficiency and accuracy through the DB15 / 25 female interface and dual switch selection system, shortening the measurement time from 1 hour per unit to 3-5 minutes, improving efficiency by approximately 95%. The platform is simple and portable in design, does not require an external power supply, and is suitable for different types of transformers. It simplifies the operating process, reduces the risk of human error, and improves data reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a first principle diagram of a dry-type transformer temperature measurement RTD direct resistance measurement device provided by the utility model;

[0015] Figure 2 This is a second principle schematic diagram of a dry-type transformer temperature measurement RTD direct resistance measurement device provided by the utility model. DETAILED DESCRIPTION

[0016] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0017] like Figure 1 As shown, the utility model provides one of the embodiments: a dry-type transformer temperature measurement RTD direct resistance measuring device, comprising: a first female interface, a second female connector, a first four-pole double-throw switch, a second four-pole double-throw switch, a test line, and an external test device; one end of the first female interface and one end of the second female connector are respectively connected to the access port of the temperature measurement RTD lead-out line, the other end of the first female interface and the other end of the second female connector are respectively connected to the input end of the first four-pole double-throw switch, the output end of the first four-pole double-throw switch is connected to the input end of the second four-pole double-throw switch, the output end of the second four-pole double-throw switch is connected to one end of the test line, and the other end of the test line is connected to the measurement port of the external test device.

[0018] Specifically, the temperature measuring RTD is divided into a first temperature measuring RTD and a second temperature measuring RTD; wherein, the first temperature measuring RTD is fixedly set at the factory high-voltage transformer winding, and the second temperature measuring RTD is fixedly set at the excitation transformer winding. The access port of the first temperature measuring RTD lead-out line corresponds to the first female interface, and the access port of the second temperature measuring RTD lead-out line corresponds to the second female interface.

[0019] In this embodiment, this embodiment mainly uses the DB15 / 25 female connector (i.e., the first female connector interface and the second female connector) as the temperature measurement RTD lead-out line access port, provides two four-pole double-throw switches for transformer type and channel selection, and leads out red and black test lines to connect to the measurement port of the external test equipment, ultimately realizing the line selection measurement of the excitation transformer / factory high-voltage transformer and channel A / channel B.

[0020] In this embodiment, the external test device specifically includes a digital-to-analog conversion chip, a main control chip, and a liquid crystal display screen, wherein the free end of the test line, the digital-to-analog conversion chip, the main control chip, and the liquid crystal display screen are sequentially connected. The external test device also includes a crystal oscillator circuit, which is connected to the main control chip. The external test device also includes a reset circuit, which is connected to the main control chip. The external test device also includes a test button, which is connected to the main control chip.

[0021] In practice, the crystal oscillator circuit primarily provides a stable clock signal for the main control chip, including generating a reference frequency and providing a reference for the main control chip's timers and counters. The reset circuit, on the other hand, ensures proper initialization of the main control chip during startup or when encountering abnormal conditions. It will be appreciated that the crystal oscillator circuit, reset circuit, and test button in this embodiment are all existing components. Their presence or absence is irrelevant to the primary implementation of this embodiment and will not be detailed here.

[0022] In another application of this embodiment, the external test equipment can be replaced with an ohmmeter, and the red and black test lines can be connected to the ohmmeter measurement port to achieve line selection measurement of the excitation transformer / factory high-voltage transformer and channel A / channel B.

[0023] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A dry-type transformer temperature measurement RTD direct resistance measurement device, characterized in that: include: First female connector, second female connector, first four-pole double-throw switch, second four-pole double-throw switch, test leads, and external test equipment; One end of the first female interface and one end of the second female connector are respectively connected to the access port of the temperature measuring RTD lead-out line, the other end of the first female interface and the other end of the second female connector are respectively connected to the input end of the first four-pole double-throw switch, the output end of the first four-pole double-throw switch is connected to the input end of the second four-pole double-throw switch, the output end of the second four-pole double-throw switch is connected to one end of the test line, and the other end of the test line is connected to the measurement port of the external test equipment.

2. The dry-type transformer temperature measurement RTD direct resistance measuring device according to claim 1 is characterized in that: It also includes a temperature compensation device, which is fixedly arranged at the temperature measuring RTD. The temperature compensation device is integrated with a temperature sensor to detect the ambient temperature of the temperature measuring RTD.

3. The dry-type transformer temperature measurement RTD direct resistance measuring device according to claim 2 is characterized in that: The temperature measuring RTD is specifically divided into a first temperature measuring RTD and a second temperature measuring RTD; wherein, the first temperature measuring RTD is fixedly set at the factory high-voltage transformer winding, and the second temperature measuring RTD is fixedly set at the excitation transformer winding. The access port of the first temperature measuring RTD lead-out line corresponds to the first female interface, and the access port of the second temperature measuring RTD lead-out line corresponds to the second female interface.

4. The dry-type transformer temperature measurement RTD direct resistance measuring device according to claim 3 is characterized in that: The external test equipment specifically includes a digital-to-analog conversion chip, a main control chip and a liquid crystal display screen. The free end of the test line, the digital-to-analog conversion chip, the main control chip and the liquid crystal display screen are connected in sequence.

5. The dry-type transformer temperature measurement RTD direct resistance measuring device according to claim 4 is characterized in that: The external testing device further includes a crystal oscillator circuit, which is connected to the main control chip.

6. The dry-type transformer temperature measurement RTD direct resistance measuring device according to claim 5, characterized in that: The external testing device further includes a reset circuit, which is connected to the main control chip.

7. The dry-type transformer temperature measurement RTD direct resistance measuring device according to claim 6, characterized in that: The external testing device further includes a test button, which is connected to the main control chip.

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