CN105823928A - Portable direct current resistance and transformation ratio test integrated device and operation method - Google Patents

Abstract

The portable DC resistance and transformation ratio test integrated device includes a power supply and a switch, and is characterized in that it also includes a wiring unit, a ground terminal, a control unit and a display unit. The control unit is connected to the single-chip microcomputer in the device, and the single-chip microcomputer is connected to the The wiring unit is connected to the display unit, the control unit is connected to the printing unit, one end of the ground terminal is connected to the device, and the other end of the ground terminal is grounded, and the ground terminal is used to protect the safety of the device and the device under test. The invention provides a portable integrated device for testing DC resistance and variable ratio, which has the characteristics of convenient portability, simple operation, fast labor and labor saving.

Description

Portable DC resistance and transformation ratio test integrated device and operation method

technical field

The invention relates to a portable direct current resistance and variable ratio test integrated device, which belongs to the field of power system transformer test.

Background technique

Transformer DC resistance test is an important test item in transformer test. Test the DC resistance of the transformer winding and the bushing to check the welding quality of the wire joint inside the winding, the welding quality of the lead wire and the winding joint, the tap position of the voltage tap changer and the good contact between the lead wire and the bushing, and whether the parallel branch connection is good. Correct, whether the current-carrying part of the transformer is open circuit, poor contact, and whether there is a short circuit in the winding; the transformation ratio of the transformer is one of the important conditions for parallel operation of the transformer. For the installed transformer, the transformation ratio test is mainly to check the position of the tap changer and each Check whether the outgoing line terminal mark is correct compared with the transformer nameplate, and when the transformer circuit fails, check whether there is an inter-turn short circuit in the transformer, etc. Therefore, to have a true and accurate grasp of the parameters of each phase of the DC resistance and transformation ratio test of the transformer, it is necessary to carry out specific measurements on the DC resistance and transformation ratio of the transformer. This is of great significance to accurately assess the safety of the transformer and ensure the reliable operation of the transformer. In the process of transformer DC resistance test and transformer ratio test, according to the different requirements of the measured items, it is necessary to use different test lines to test the test wiring and change the line of the measured transformer to meet the corresponding test conditions. For example, when conducting DC resistance test and transformation ratio, use the corresponding DC resistance tester and transformation ratio tester according to the voltage level of the transformer, and at the same time fix the test line on the three-phase winding of the transformer and the high and low voltage terminals of the transformer. In the traditional transformer DC resistance and transformation ratio test, the tester connects the test test line of the test item to the high and low voltage windings of the transformer. Many times, in the process of connecting the test line, due to the cleanliness and firmness of the surface of the sleeve, the test line is often not in sufficient contact with the sleeve, which makes the tester consume a lot of physical strength to repeatedly connect the test line to meet the test conditions. The following problems exist in the traditional transformer DC resistance and transformation ratio test process: first, there are uncertain factors in the manual connection of the test line, and the contact firmness of the test line usually cannot meet the test requirements; the second is that the tester is changing the test line In the process, it is necessary to climb the transformer many times, which consumes physical strength and has dangerous factors; the third is that the test time is long, and it usually takes 1 hour under normal circumstances (the DC resistance test of the transformer generally takes 30 minutes; the transformer ratio test generally takes 30 minutes); There are many people (need 2-3 people to complete), and the work efficiency is low.

To sum up, in order to ensure the safety of the power grid and personnel during the test, a new type of portable DC resistance and transformation ratio test integrated device is used, which is easy to carry and easy to operate. Testers need to quickly connect the test lines and work efficiently.

Contents of the invention

The invention provides a portable integrated device for testing DC resistance and transformation ratio, which overcomes the need to use multiple test equipment to test DC resistance and transformation ratio of transformers, and at the same time solves the problem of multiple replacement tests in the process of testing personnel for DC resistance and transformation ratio testing of transformers. Problems such as insecurity, low efficiency, and high energy consumption caused by wiring.

The present invention is achieved through the following technical solutions:

The portable DC resistance and transformation ratio test integrated device includes a power supply and a switch, and is characterized in that it also includes a control unit, a grounding terminal and a fan. The control unit is connected to the single-chip microcomputer in the device, and the single-chip microcomputer is respectively connected to the wiring unit and the display The control unit is connected to the printing unit, one end of the grounding terminal is connected to the device, and the other end of the grounding terminal is grounded, and the fan is installed inside the device to exhaust and dissipate heat from the device.

Wherein, the control unit includes a tap position, a selection key and a function key, and the tap position is used for testing the transformation ratio of the transformer.

Wherein, the single-chip microcomputer integrates the DC resistance test module and the transformation ratio test module together to perform the transformer parameter test.

Wherein, the wiring unit is a binding post, which is used to fix the test wiring in the transformer test.

Wherein, the display unit is a display screen, which is used to display the test items and data information of the DC resistance and transformation ratio of the transformer.

Wherein, the function keys include a test key, a confirmation key, a reset key and a print key, and the reset key is used to discharge the device, thereby protecting the safety of the device and personnel.

The operation method of the portable DC resistance and transformation ratio test integrated device includes the following steps:

(1) The control unit is selected according to the test items, and the wiring unit and the grounding terminal are connected correctly;

(2) Turn on the power, turn on the switch, the display unit will display the test items of DC resistance and transformation ratio, and select the items according to the test requirements;

(3) Start the test button of the control unit, and the device will work normally;

(4) After the test work is completed, activate the reset button of the control unit to ensure that the device is fully discharged;

(5) After the discharge is completed, the tester can replace the test wiring.

Compared with the prior art, the beneficial effects of the present invention are as follows: the portable DC resistance and variable ratio test integrated device provided by the present invention has the characteristics of easy portability, simple operation, fast and labor-saving; the operation button can use portable DC resistance, variable ratio The comparison integrated device selects the test function to the test items required by the transformer, and the device automatically performs the DC resistance or transformation ratio test through the test button, so that the transformer DC resistance and transformation ratio test can save time and effort, and the work efficiency is high; set in the device The internal fan can exhaust and dissipate heat from the device, prolonging the service life of the device.

Description of drawings

Fig. 1 is a structural schematic diagram of a portable DC resistance and transformation ratio test integrated device of the present invention.

Fig. 2 is a structural block diagram of the portable DC resistance and transformation ratio testing integrated device of the present invention.

In the figure: 1. Power supply, 2. Wiring unit, 3. Grounding terminal, 4. Control unit, 41. Tapping position, 42. Selection button, 43. Function button, 5. Display unit, 6. Printing unit, 7 .switch.

detailed description

The present invention is described in further detail below in conjunction with embodiment. The following implementations are only examples of specific implementation of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial changes made to the present invention by using this concept should be within the protection scope of the present invention.

Example

As shown in Figure 1, the portable DC resistance and transformation ratio test integrated device includes a power supply 1 and a switch 7, and also includes a wiring unit 2, a ground terminal 3, a control unit 4 and a display unit 5, and the control unit 4 is connected to the single-chip microcomputer in the device , the single-chip microcomputer is connected with the wiring unit 2 and the display unit 5 respectively, the single-chip microcomputer integrates the DC resistance test module and the transformation ratio test module together to perform the transformer parameter test, the control unit 4 is connected with the printing unit 6, and the ground terminal 3 is connected with the device , the other end of the ground terminal 3 is grounded, and the ground terminal 3 is used for the safety of the protection device and the device under test.

Wherein, the control unit 4 includes a tap position 41, a selection button 42 and a function key 43, the tap position 41 is used to test the transformer ratio, and the function key 43 includes a test key, a confirmation key, a reset key and a print key, and the reset key It is used to discharge the device to protect the safety of the device and personnel. The wiring unit 2 is a terminal, which is used to fix the test wiring in the transformer test. The display unit 5 is a display screen, which is used to display the test items and data information of the transformer DC resistance and transformation ratio. There is also a fan inside the device, which can exhaust and dissipate heat, and prolong the practical life of the device.

The main function of the power supply 1 is to provide power to the device, keep the device continuously charged, and ensure the normal operation of the device. The wiring unit 2 is in the form of a binding post, which is used to fix the test wiring in the transformer test. The wiring unit 2 is used to connect the transformer and the test device, and the wiring unit 2 ensures reliable connection of the test wiring and increases the contact area. The number of wiring is determined according to the specific test items of the test, which greatly reduces the time for simultaneous testing of DC resistance and transformation ratio of the transformer. The grounding terminal 3 ensures reliable grounding of the device, and safe operation of the protection device and the device under test.

As shown in Figure 2, the device receives signals through the wiring unit 2, and the received signals of transformer DC resistance and transformation ratio test items are displayed on the display unit 5, and the control unit 4 selects the items to be tested, and then performs data processing through the single-chip microcomputer. The display unit 5 reads the data information, and finally prints the data through the printing unit 6 .

The specific operation method of this device is as follows:

The control unit 4 selects according to the test items, the connection unit 2 and the ground terminal 3 are connected correctly, the power supply 1 is turned on, the switch 7 is turned on, the display unit 5 will display the test items of DC resistance and transformation ratio, and the item selection is performed according to the test requirements, and the control is started. Unit 4 test button, the device works normally, after the test work is completed, start the control unit 4 reset button to ensure that the device is completely discharged, after the discharge is completed, the tester can replace the test wiring.

Claims (7)

1. A portable DC resistance and transformation ratio test integrated device, including a power supply and a switch, and is characterized in that it also includes a control unit, a ground terminal and a fan. The control unit is connected to the single-chip microcomputer in the device, and the single-chip microcomputer is respectively connected to the wiring unit It is connected to the display unit, the control unit is connected to the printing unit, one end of the ground terminal is connected to the device, and the other end of the ground terminal is grounded, and the fan is installed inside the device to exhaust and dissipate heat from the device. 2. The portable DC resistance and transformation ratio test integrated device according to claim 1, characterized in that the control unit includes a tap position, a selection button and a function key, and the tap position is used for testing the transformer Ratio. 3. The portable DC resistance and transformation ratio test integrated device according to claim 1, characterized in that the single-chip microcomputer integrates the DC resistance test module and the transformation ratio test module to perform transformer parameter testing. 4. The portable integrated device for measuring DC resistance and transformation ratio according to claim 1, characterized in that said wiring unit is a terminal, which is used to fix the test wiring in the transformer test. 5. The portable integrated device for testing DC resistance and transformation ratio according to claim 1, characterized in that said display unit is a display screen for displaying test items and data information of transformer DC resistance and transformation ratio. 6. The portable DC resistance and variable ratio test integrated device according to claim 2, wherein the function keys include a test key, a confirmation key, a reset key and a print key, and the reset key is used to discharge the device , so as to protect the safety of equipment and personnel. 7. The operating method of the portable DC resistance and transformation ratio test integrated device according to claim 1-6, characterized in that it comprises the following steps: The control unit is selected according to the test items, and the wiring unit and the ground terminal are connected correctly; Turn on the power, turn on the switch, the display unit will display the test items of DC resistance and transformation ratio, and select the items according to the test requirements; Start the test button of the control unit, and the device will work normally; After the test work is completed, activate the reset button of the control unit to ensure that the device is fully discharged; After the discharge is completed, the tester can replace the test wiring.