CN218886025U

CN218886025U - Multifunctional water-cooled insulation resistance tester

Info

Publication number: CN218886025U
Application number: CN202222645125.2U
Authority: CN
Inventors: 余凯; 毛本立; 张春晖; 刘惠娟; 尧阳
Original assignee: Huadian Electric Power Research Institute Co Ltd
Current assignee: Huadian Electric Power Research Institute Co Ltd
Priority date: 2022-10-09
Filing date: 2022-10-09
Publication date: 2023-04-18
Anticipated expiration: 2032-10-09

Abstract

The utility model discloses a cold insulation resistance tester in multi-functional water, including the tester body, the front of tester body is provided with circuit L terminal, catchment pipe G terminal, base E terminal, jack, shift knob, display screen, function button-increase, function button-reduce, function button-function and function button-affirmation, and circuit L terminal, catchment pipe G terminal and base E terminal are used for connecting test equipment, and jack is used for connecting, and shift knob is used for the on-off control tester. Under the premise that the internal water cooling insulation resistance tester is used for measuring insulation resistance, the function of measuring the insulation water pipe resistance (namely the total resistance between the winding and the total water inlet and outlet pipes) Ry and the total water inlet and outlet pipe parallel connection ground insulation resistance Rh is added, insulation resistance measurement and water quality judgment can be completed through one set of equipment, the number of equipment worn by electrical testing personnel on a working site is reduced, the working strength is reduced, and the working efficiency is improved.

Description

Multifunctional water-cooled insulation resistance tester

Technical Field

The utility model relates to a cold insulation resistance tester in multi-functional water belongs to the electrical test category, and the wide application is in electric power and energy field.

Background

According to corresponding regulations, specifications and technical standards, the measurement of the insulation resistance, absorption ratio or polarization index of a stator winding needs to be carried out before starting, during C-level maintenance, before and after A-level maintenance or when necessary.

The water quality of the internal cooling water of the water internal cooling steam turbine generator is required to be 0.4 mu s/cm-2.0 mu s/cm at 25 ℃ in the operation process; the control standard of the internal cooling water of the double-water internal cooling generator is that the electrical conductivity at 25 ℃ is less than 5.0 mu s/cm; in carrying out the electrical tests, the conductivity is required at a water temperature of 20 ℃: not more than 5.0. Mu.s/cm for an open water system and 1.5. Mu.s/cm for a separate closed circulating water system. When the quality of the internal cooling water does not meet the requirement, the insulation resistance cannot be measured.

When the insulation resistance measurement of the water-cooled generator is carried out, the quality of the water of the internal cooling water is ensured to meet the requirement, and then the water quality condition is confirmed by measuring the resistance of an insulation water pipe (namely the total resistance between a winding and a total water inlet and outlet pipe) Ry and the parallel connection of the total water inlet and outlet pipe and the ground insulation resistance Rh. When the conditions are met, stator winding insulation resistance, absorption ratio or polarization index measurements can be performed.

Generally, under the condition that water quality meets requirements, insulation resistance, absorption ratio or polarization index of a stator winding is developed, during measurement, an additional digital multimeter is needed to be found for measuring the resistance Ry of an insulated water pipe (namely the total resistance between the winding and a total water inlet and outlet pipe) and the total water inlet and outlet pipe in parallel connection with the ground insulation resistance Rh, and sometimes, no preparation is made, so that the difficulty of test development is increased.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the aforesaid that exists among the prior art not enough, and provide a cooling insulation resistance tester in the water of the reasonable multi-functional of structural design, under cooling insulation resistance tester carries out insulation resistance measuring prerequisite in the water, increased the function of measuring insulation water pipe resistance (total resistance between winding and total business turn over water pipe promptly) Ry and total business turn over water pipe parallel connection ground insulation resistance Rh.

The utility model provides a technical scheme that above-mentioned problem adopted is: the utility model provides a cold insulation resistance tester in multi-functional water, includes the tester body, characterized by, the front of tester body is provided with circuit L terminal, catchment pipe G terminal, base E terminal, jack, shift knob, display screen, function button-increase, function button-reduce, function button-function and function button-affirmation, circuit L terminal, catchment pipe G terminal and base E terminal are used for connecting test equipment, jack is used for connecting, shift knob is used for opening, close control tester.

Further, the function buttons-increase, function buttons-decrease, function buttons-function and function buttons-confirm selection and operation of the tester functions.

Furthermore, the line L binding post, the water collecting pipe G binding post and the base E binding post are plug-in access holes with the size of phi 4 mm.

Furthermore, the line L terminal, the water collecting pipe G terminal and the base E terminal can be plugged in a power test in a plugging mode, and can also be clamped and connected by a power test rack.

Furthermore, before use, the power supply jack needs to be connected with a power line to provide AC220V.

Further, the pressing direction of the switch button is 'I' for turning on the equipment, and 'O' for turning off the equipment.

Furthermore, the inside of the tester body is provided with a numerical control voltage regulator, a DC-DC converter, a voltage dividing circuit, a controller and a measuring circuit, the numerical control voltage regulator, the DC-DC converter, the voltage dividing circuit and the measuring circuit are sequentially connected, the controller is respectively connected with the numerical control voltage regulator, the measuring circuit, a display screen and function buttons, and the display screen and the function buttons are formed by a display screen, function buttons, an increase button, a decrease button, function buttons, and a confirmation button.

Further, the numerical control voltage regulator adopts a PWM circuit to output in a 0-5V standard in a high-efficiency mode.

Furthermore, the DC-DC converter adopts a step-up transformer to efficiently convert and output 1.5kV direct current high voltage.

Furthermore, the voltage division circuit converts 2.5kV high voltage into 5V, which is convenient for AD acquisition.

Furthermore, the measuring circuit carries out insulation measurement, resistance measurement between the line L binding post and the water collecting pipe G binding post and resistance measurement between the water collecting pipe G binding post and the base E binding post.

Furthermore, the controller can perform function selection to complete the measurement of insulation resistance, the measurement of resistance of the insulation water pipe (namely, total resistance between the winding and the total water inlet and outlet pipe) Ry and the measurement of the insulation resistance Rh of the total water inlet and outlet pipe in parallel connection to the ground.

Further, the function button-up performs an operation of moving up, the function button-down performs an operation of moving down, the function button-function performs an operation of returning to the previous page, the function button-confirms an operation of confirming or opening a test.

Compared with the prior art, the utility model, have following advantage and effect: under the premise of measuring the insulation resistance by the internal water cooling insulation resistance tester, the function of measuring the insulation water pipe resistance (namely the total resistance between the winding and the total water inlet and outlet pipes) Ry and the total water inlet and outlet pipe parallel connection ground insulation resistance Rh is added, the insulation resistance measurement and the water quality judgment can be completed by one set of equipment, the number of equipment worn by electrical testing personnel on a working site is reduced, the working strength is reduced, and the working efficiency is improved.

Drawings

Fig. 1 is a schematic diagram of a panel structure of the middle tester of the present invention.

Fig. 2 is a schematic diagram of the connection relationship between the internal components of the middle tester of the present invention.

In the figure: the device comprises a line L terminal 1, a water collecting pipe G terminal 2, a base E terminal 3, a power jack 4, a switch button 5, a display screen 6, a function button-increase 7, a function button-decrease 8, a function button-function 9, a function button-confirm 10, a tester body 11, a numerical control voltage regulator 12, a DC-DC converter 13, a voltage division circuit 14, a controller 15, a measuring circuit 16, a display screen and a function button 17.

Detailed Description

The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not intended to limit the present invention.

Examples

Referring to fig. 1 to 2, in the embodiment, a multifunctional water-cooled insulation resistance tester includes a tester body 11, a line L terminal 1, a water collection pipe G terminal 2, a base E terminal 3, a power jack 4, a switch button 5, a display screen 6, a function button increase 7, a function button decrease 8, a function button function 9, and a function button confirm 10 are disposed on a front surface of the tester body 11, the line L terminal 1, the water collection pipe G terminal 2, and the base E terminal 3 are used for connecting test equipment, the power jack 4 is used for connecting a power supply, and the switch button 5 is used for turning on and off the tester.

In the embodiment, a line L wiring terminal 1 is connected with a generator stator winding through an electric power test wire, a water collecting pipe G wiring terminal 2 is connected with a generator water collecting pipe outgoing line through an electric power test wire, a base E wiring terminal 3 is connected with a ground row through an electric power test wire, a power supply jack 4 provides an AC220V power supply for a tester through a connection power supply wire, a switch button 5 is used for switching on and off the tester, and a function button-increase 7, a function button-decrease 8, a function button-function 9 and a function button-confirmation 10 are used for performing functional operation of the tester.

In this embodiment, the line L terminal 1, the header G terminal 2, and the base E terminal 3 are all plug-in holes with a size of Φ 4mm, and can be plugged in a power test, or clamped and connected by a power test rack. Before use, the power supply jack 4 needs to be connected with a power line to provide AC220V. The switch button 5 is pressed to "I" to turn on the device and "O" to turn off the device. The display screen 6 is a liquid crystal display screen and can output the contents of the tester. The function button-add 7, function button-subtract 8, function button-function 9, and function button-confirm 10 are input means for performing operations, which are key operations; the function button-up 7 performs an operation of moving up, the function button-down 8 performs an operation of moving down, the function button-function 9 performs an operation of returning to the previous page, the function button-confirm 10 performs an operation of confirming or opening the test.

In this embodiment, a numerical control voltage regulator 12, a DC-DC converter 13, a voltage dividing circuit 14, a controller 15 and a measuring circuit 16 are installed inside a tester body 11, and the numerical control voltage regulator 12, the DC-DC converter 13, the voltage dividing circuit 14 and the measuring circuit 16 are connected in sequence and are a working loop of the tester; the numerical control voltage regulator 12 adopts a PWM circuit to produce 0-5V standard output at high efficiency, the DC-DC converter 13 adopts a step-up transformer to convert 1.5kV direct current high voltage at high efficiency, and the voltage dividing circuit 14 converts 2.5kV high voltage into 5V for AD acquisition. The controller 15 is respectively connected with the numerical control voltage regulator 12, the measuring circuit 16, the display screen and the function button 17 to complete corresponding measuring functions. The measuring circuit 16 performs insulation measurement, resistance measurement between the line L terminal 1 and the header G terminal 2, and resistance measurement of the header G terminal 2 and the base E terminal 3. The display and function buttons 17 consist of a display 6, function buttons-add 7, function buttons-subtract 8, function buttons-function 9, function buttons-confirm 10. The controller 15 is an existing product and can perform function selection to complete insulation resistance measurement, insulation water pipe resistance (i.e. total resistance between the winding and the total water inlet and outlet pipe) Ry measurement and measurement of the total water inlet and outlet pipe parallel connection ground insulation resistance Rh.

The using method comprises the following steps: when the water-cooled insulation resistance test is carried out, the stator winding is connected into the L wiring terminal 1 of the circuit through the electric power test wire, the outgoing line of the water collecting pipe is connected into the G wiring terminal 2 of the water collecting pipe, and the outgoing line of the water collecting pipe is reliably connected into the E wiring terminal 3 of the base. The power cord is connected to the power jack 4, and the test equipment is turned on through the switch button 5. Up and down movement by function button-up 7 and function button-down 8, return by function button-function 9, confirmation by function button-confirm 10 selection.

When the resistance Ry of the insulated water pipe (namely the total resistance between the winding and the total water inlet and outlet pipe) is measured, the resistance Ry is moved to the 'insulated water pipe resistance' through the function button increasing 7 and the function button decreasing 8, the resistance Ry enters a measurement interface by pressing the function button confirming 10, the test is started by pressing the function button confirming 10 again, and the numerical value is recorded after the measurement is finished.

When the parallel earth insulation resistance Rh of the main water inlet and outlet pipe is measured, firstly pressing the function button-function 9 to return to the main interface, moving to the ground resistance of the water conduit pipe through the function button-increase 7 and the function button-decrease 8, pressing the function button-confirm 10 to enter the measurement interface, pressing the function button-confirm 10 again to start the test, and recording the numerical value after the measurement is finished.

When the insulation resistance needs to be measured, firstly pressing the function button-function 9 to return to the main interface, moving to the 'insulation resistance' through the function button-increase 7 and the function button-decrease 8, pressing the function button-confirm 10 to enter the measurement interface, pressing the function button-confirm 10 again to start the test, and recording the numerical value after the measurement is finished.

After measuring insulation resistance, fully discharging generator stator winding ground connection with special electric power test wire, closing the tester through shift knob 5, wiring on circuit L terminal 1, catchment pipe G terminal 2, base E terminal 3, power jack 4, the finishing equipment.

Those not described in detail in this specification are well within the skill of the art.

In addition, it should be noted that the above contents described in the present specification are only examples of the structure of the present invention. All equivalent changes made according to the structure, characteristics and principle of the utility model are included in the protection scope of the utility model. Those skilled in the art can modify, supplement, or substitute the described embodiments without departing from the scope of the invention as defined by the claims.

Claims

1. The utility model provides a cold insulation resistance tester in multi-functional water, includes tester body (11), characterized by, the front of tester body (11) is provided with circuit L terminal (1), catchment pipe G terminal (2), base E terminal (3), jack (4), shift knob (5), display screen (6), function button-increase (7), function button-reduce (8), function button-function (9) and function button-affirmation (10), circuit L terminal (1), catchment pipe G terminal (2) and base E terminal (3) are used for connecting test equipment, jack (4) are used for connecting.

2. The multifunctional water-cooled insulation resistance tester as claimed in claim 1, wherein the line L terminal (1), the water collecting pipe G terminal (2) and the base E terminal (3) are pluggable access holes with the size of phi 4 mm.

3. The multifunctional water-cooled insulation resistance tester as claimed in claim 1 or 2, wherein the line L terminal (1), the water collecting pipe G terminal (2) and the base E terminal (3) can be plugged in and plugged in a power test, and can also be clamped and connected by a power test rack.

4. The multifunctional water-cooled insulation resistance tester as claimed in claim 1, wherein the switch button (5) is turned on when pressed to "I", and the switch button (5) is turned off when pressed to "O".

5. The multifunctional water-cooled insulation resistance tester as claimed in claim 1, wherein a numerical control voltage regulator (12), a DC-DC converter (13), a voltage dividing circuit (14), a controller (15) and a measuring circuit (16) are installed inside the tester body (11), the numerical control voltage regulator (12), the DC-DC converter (13), the voltage dividing circuit (14) and the measuring circuit (16) are sequentially connected, the controller (15) is respectively connected with the numerical control voltage regulator (12), the measuring circuit (16), a display screen and a function button (17), and the display screen and the function button (17) are composed of a display screen (6), a function button increase (7), a function button decrease (8), a function button function (9) and a function button confirmation (10).