Short circuit device for temperature rise test of single-phase transformer

Abstract

The utility model relates to a short circuit device for a temperature rise test of a single-phase transformer. The short circuit device comprises an insulating sleeve which comprises a plurality of first insulators and a plurality of second insulators, the plurality of first insulators are mutually connected to form a first terminal, the plurality of second insulators are mutually connected to form a second terminal, and the first terminal and the second terminal are respectively connected to two ends of a short circuit winding of the transformer; the isolation disconnecting link is positioned between the first terminal and the second terminal and can be switched between a first position for short-circuiting the first terminal and the second terminal and a second position for disconnecting the first terminal and the second terminal; and a first motor connected to the isolation switch and connected to the remote control box through a first cable. The isolation switch is switched between a first position and a second position through rotation of the first motor under the control of the remote control box. The short-circuit device realizes the function of remotely controlling the closing and opening of the short-circuit device through the remote control box, so that the operation time is shortened, and the risks of electric shock and scald of testers are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to transformer test technical field, concretely relates to a short circuit device for single -phase transformer temperature rise test. BACKGROUND

[0002] The purpose of transformer temperature rise test is mainly to verify whether the design of transformer is reasonable and whether the cooling system normally plays a role, and determines whether the temperature rise of each part of the transformer meets the specified limit value of relevant standards and technical agreement, wherein the winding average temperature rise is determined by measuring the thermal resistance value of the winding after the temperature rise test reaches the steady state specified in the standard and the maximum rated current is applied for one hour and then power off.

[0003] During single-phase transformer temperature rise test, the high-voltage winding is powered on, and the low-voltage winding is short-circuited but not grounded, so as to power the transformer and make it heat up. After the power-on process is completed, the standard requires that the effective winding thermal resistance value be measured within 2 minutes after power off. In order to meet this requirement, all steps and operations from the preparation of transformer power off to the measurement of effective thermal resistance value must be as fast and accurate as possible. This process requires high coordination between test personnel and test steps, and is difficult and poses a great safety risk to test personnel.

[0004] Currently, during single-phase transformer temperature rise test, the high-voltage winding is powered on, and the low-voltage winding is short-circuited using a metal copper bar but not grounded. In order to meet the requirement of measuring the effective winding thermal resistance value within 2 minutes after power off as specified in the standard, before the power-on process is completed, the test personnel need to climb close to the short-circuited winding of the transformer under the condition that the overall temperature of the transformer is very high and not powered off, and manually open the short-circuit copper bar and connect the resistance measurement line for measurement as soon as possible after power off. This operation requires a long time (more than 2 minutes), which seriously affects the accuracy of the test results, and the test personnel face a high risk of electric shock and burns. UTILITY MODEL CONTENTS

[0005] The utility model embodiment provides a short circuit device for single -phase transformer temperature rise test, can avoid test personnel to climb close to the short -circuited winding of the transformer with electric, can realize the function that short circuit device closes and opens in the safe ground remote control, thereby make the short -circuited winding of temperature rise test transformer short -circuited closes and opens, to at least solve the problem of complicated, slow speed, low accuracy of test results, great safety risk of test personnel in prior art temperature rise test circuit dismounting.

[0006] According to one aspect of the utility model embodiment, a short circuit device for single-phase transformer temperature rise test is provided, comprising: an insulating sleeve including a plurality of first insulators and a plurality of second insulators, the tops of the plurality of first insulators are connected to each other to form a first terminal, the tops of the plurality of second insulators are connected to each other to form a second terminal, the first terminal and the second terminal are respectively connected to two ends of a short-circuit winding of a single-phase transformer, an isolation switch is located between the first terminal and the second terminal, and the isolation switch can be switched between a first position in which the first terminal and the second terminal are short-circuited and a second position in which the first terminal and the second terminal are disconnected; and a first motor, the first motor is connected to the isolation switch, and the first motor is connected to a remote control box through a first cable; wherein the isolation switch is switched between the first position and the second position by rotation of the first motor under control of the remote control box.

[0007] In this way, the short circuit device of the utility model embodiment switches the isolation switch between the first position and the second position by rotation of the first motor under control of the remote control box to realize short-circuiting and disconnection of the first terminal and the second terminal, which can realize the functions of remotely controlling the closing and opening of the short circuit device, so that the short-circuit winding in the temperature rise test is quickly short-circuited and opened, the operation time is shortened, the accuracy of the test result is improved, and the risk of electric shock and scalding of the test personnel is reduced.

[0008] According to the exemplary embodiment of the utility model, the first terminal includes a first isolation switch connection end and a first short-circuit winding connection end on the top side, and the second terminal includes a second isolation switch connection end and a second short-circuit winding connection end on the top side, wherein the first terminal and the second terminal being respectively connected to two ends of a short-circuit winding of a single-phase transformer comprises: the first short-circuit winding connection end of the first terminal being connected to a first end of the short-circuit winding of the single-phase transformer through a copper wire and a bolt, and the second short-circuit winding connection end of the second terminal being connected to a second end of the short-circuit winding of the single-phase transformer through a copper wire and a bolt.

[0009] In this way, in the short circuit device of the utility model embodiment, the first short-circuit winding connection end of the first terminal and the second short-circuit winding connection end of the second terminal are respectively connected to two ends of a short-circuit winding of a single-phase transformer through a copper wire and a bolt, thereby realizing the connection of the first terminal and the second terminal to the short-circuit winding.

[0010] According to the exemplary embodiment of the utility model, one end of the isolation knife switch is pivotally connected to the first isolation knife switch connecting end of the first terminal through a fixed rod, and the isolation knife switch can be switched between the first position of short-circuiting the first terminal and the second terminal and the second position of disconnecting the first terminal and the second terminal, comprising: the isolation knife switch is pivotally moved around the fixed rod between the first position and the second position, wherein when the isolation knife switch is at the first position, the other end of the isolation knife switch is connected to the second isolation knife switch connecting end of the second terminal, and when the isolation knife switch is at the second position, the other end of the isolation knife switch is disconnected from the second isolation knife switch connecting end of the second terminal.

[0011] In this way, in the short-circuit device of the utility model embodiment, one end of the isolation knife switch is pivotally connected to the first isolation knife switch connecting end of the first terminal through a fixed rod, the other end of the isolation knife switch is connected or disconnected from the second isolation knife switch connecting end of the second terminal, thereby realizing the short-circuiting and disconnecting of the first terminal and the second terminal, and realizing the closing and opening functions of the short-circuit device.

[0012] According to the exemplary embodiment of the utility model, the short-circuit device further comprises a telescopic rod, the isolation knife switch is connected to the first motor through the telescopic rod, and the isolation knife switch is switched between the first position and the second position under the control of the remote control box through the rotation of the first motor, comprising: when the remote control box is powered on and the closing button is pressed, the first motor rotates, the isolation knife switch is switched to the first position through the downward pulling action of the telescopic rod, and when the remote control box is powered on and the opening button is pressed, the first motor rotates, the isolation knife switch is switched to the second position through the upward lifting action of the telescopic rod.

[0013] In this way, under the control of the remote control box, the short-circuit device of the utility model embodiment switches the isolation knife switch between the first position and the second position through the rotation of the first motor under the downward pulling action and the upward lifting action of the telescopic rod, thereby realizing the closing and opening functions of the short-circuit device.

[0014] According to the exemplary embodiment of the utility model, the short-circuit device further comprises a grounding rod and a second motor, one end of the grounding rod is connected to the second motor, the second motor is connected to the remote control box through a second cable, and the other end of the grounding rod is connected or disconnected from the first isolation knife switch connecting end of the first terminal of the insulating sleeve under the control of the remote control box through the rotation of the second motor.

[0015] In this way, under the control of the remote control box, the short-circuit device of the utility model embodiment connects or disconnects the grounding rod from the first isolation knife switch connecting end of the first terminal of the insulating sleeve through the rotation of the second motor, thereby realizing the grounding or non-grounding of the first terminal and the isolation knife switch, so as to ensure that there is no charge on the isolation knife switch and that the isolation knife switch and the insulating support are connected to the same potential in the case of measuring the resistance when the short-circuit device is opened.

[0016] According to the exemplary embodiment of the utility model, in the temperature rise test of single-phase transformer, when the short-circuit winding is closed to conduct the temperature rise test, the other end of the grounding rod is disconnected from the first isolation knife switch connection end of the first terminal, and when the short-circuit winding is opened to conduct resistance measurement, the other end of the grounding rod is connected to the first isolation knife switch connection end of the first terminal.

[0017] In this way, in the temperature rise test of the transformer, when the short-circuit winding is closed to conduct the temperature rise test, the other end of the grounding rod is disconnected from the first isolation knife switch connection end of the first terminal, and when the short-circuit winding is opened to conduct resistance measurement, the other end of the grounding rod is connected to the first isolation knife switch connection end of the first terminal, so that whether the first terminal and the isolation knife switch are connected to the potential of the insulating support is controlled through the grounding rod, to ensure that there is no residual charge on the isolation knife switch.

[0018] According to the exemplary embodiment of the utility model, the first motor is connected to the second motor through the circuit interlocking mechanism, wherein, when the first motor is powered to control the isolation knife switch to close, the second motor controls the grounding rod to disconnect, and when the first motor is powered to control the isolation knife switch to open, the second motor controls the grounding rod to ground.

[0019] In this way, in the short-circuit device of the utility model embodiment, the first motor is connected to the second motor through the circuit interlocking mechanism, to realize the electrical interlocking of the first motor and the second motor, so that the first motor and the second motor cannot be driven to close at the same time, to ensure the safe operation of the first motor and the second motor.

[0020] According to the exemplary embodiment of the utility model, the short-circuit device further comprises an insulating frame for fixing the insulating sleeve.

[0021] In this way, in the short-circuit device of the utility model embodiment, the insulating sleeve is fixed through the insulating frame.

[0022] According to the exemplary embodiment of the utility model, the short-circuit device further comprises an insulating support, the insulating support comprising a rigid main body, a first end portion and a second end portion at both ends of the rigid main body, the first end portion of the insulating support being fixed on the upper surface of the oil tank of the single-phase transformer, and the second end portion of the insulating support supporting the insulating frame.

[0023] In this way, in the short-circuit device of the utility model embodiment, the short-circuit device is fixed on the upper surface of the oil tank of the single-phase transformer through the first end portion of the insulating support of the short-circuit device, and the insulating frame is supported through the second end portion of the insulating support, to realize the stable connection of the short-circuit device and the single-phase transformer.

[0024] According to the exemplary embodiment of the utility model, the insulating support further comprises a warning light for indicating whether the short circuit device is electrified.

[0025] In this way, in the short circuit device of the utility model embodiment, whether the short circuit device is electrified is indicated by the warning light, so as to ensure the safety of the test personnel.

[0026] According to the exemplary embodiment of the utility model, the remote control box comprises a display lamp for indicating the short-circuit and open state of the isolation switch.

[0027] In this way, in the short circuit device of the utility model embodiment, the short-circuit and open state of the isolation switch is directly displayed by the display lamp.

[0028] According to the exemplary embodiment of the utility model, the remote control box further comprises an emergency trip button for controlling the power-off of the remote control box.

[0029] In this way, in the short circuit device of the utility model embodiment, the power-off of the remote control box is controlled by the emergency trip button, so as to realize safety control.

[0030] According to the exemplary embodiment of the utility model, the rated current and the rated voltage of the short circuit device are respectively set according to the test current and the test voltage of the temperature rise test of the single-phase transformer.

[0031] In this way, in the short circuit device of the utility model embodiment, the rated current and the rated voltage of the short circuit device are respectively set according to the test current and the test voltage of the temperature rise test of the single-phase transformer, so that the rated current and the rated voltage of the short circuit device cover all test current ranges and all test voltage ranges of all single-phase transformers using the short circuit device.

[0032] In the embodiment of the utility model, the short circuit device for the temperature rise test of the single-phase transformer is provided, which adopts the technical scheme that the isolation switch is switched between the first position of short-circuiting the first terminal and the second terminal and the second position of disconnecting the first terminal and the second terminal under the control of the remote control box through the rotation of the first motor, so as to avoid that the test personnel climbs to be close to the electrified short-circuiting winding of the transformer, and the function of remotely controlling the short circuit device to be closed and opened on the safe ground can be realized, so as to at least solve the problems of complicated disassembly, slow speed, low accuracy of test results, and great safety risk of test personnel in the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0033] The drawings described herein are used to provide further understanding of the utility model, and constitute a part of the utility model, the schematic embodiment of the utility model and the description thereof are used to explain the utility model, and do not constitute improper limitation on the utility model. In the drawings:

[0034] Figure 1 is a front view showing the short-circuit device for single-phase transformer temperature rise test of the utility model; and

[0035] Figure 2 is a right side view showing the short-circuit device for single-phase transformer temperature rise test of the utility model in the closed state of the isolation knife switch.

[0036] List of reference signs:

[0037] 10: short-circuit device;

[0038] 100: insulating sleeve;

[0039] 100A: first terminal;

[0040] 100A1: first isolation knife switch connection end;

[0041] 100A2: first short-circuit winding connection end;

[0042] 100B: second terminal;

[0043] 100B1: second isolation knife switch connection end;

[0044] 100B2: second short-circuit winding connection end;

[0045] 102: isolation knife switch;

[0046] 104: first electric motor;

[0047] 106: remote control box;

[0048] 108: telescopic rod;

[0049] 110: grounding rod;

[0050] 112: second electric motor;

[0051] 114: insulating frame;

[0052] 116: insulating support;

[0053] 118: warning light;

[0054] 1002: first insulator;

[0055] 1004: second insulator;

[0056] 1162: rigid main body;

[0057] 1164: first end portion;

[0058] 1166: second end portion. DETAILED DESCRIPTION

[0059] Hereinafter, embodiments of the present application will be described in detail with reference to the accompanying drawings so that those skilled in the art to which the present application pertains can easily practice the embodiments of the present application. However, the present application can be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. In the drawings, parts irrelevant to the description of the present application will be omitted for the sake of clarity. Like reference numerals refer to like elements throughout the description. Also, in providing the description with reference to the drawings, although elements are denoted by the same numerals, the reference numerals referring to the elements can change and the reference numerals are described only for the convenience of the description, and should not be construed as limiting the concept, features, functions, or effects of the elements by the reference numerals.

[0060] At present, during the temperature rise test of a single-phase transformer, high-voltage windings are powered on, and low-voltage windings are short-circuited by metal copper bars but not grounded. In order to meet the requirement of measuring effective winding thermal resistance value within 2 minutes after power-off as specified in the standard, before the end of the power-on process, when the temperature of the transformer as a whole is very high and the power is not off, the test personnel need to climb close to the short-circuited windings of the transformer in advance, and wait for the power to be off to manually open the short-circuit copper bars and connect the resistance measurement lines for measurement in the shortest possible time. This operation requires a long time (more than 2 minutes), which seriously affects the accuracy of the test results, and at the same time, the test personnel face a high risk of electric shock and burns.

[0061] In view of the above technical problems, the short-circuit device for temperature rise test of a single-phase transformer according to the present application can switch the isolation knife switch between the first position of short-circuiting the first terminal and the second terminal and the second position of disconnecting the first terminal and the second terminal through rotation of the first motor under the control of the remote control box, which can avoid the test personnel from climbing close to the short-circuited windings of the transformer under power, and can realize the function of remotely controlling the short-circuit device to close and open on the safe ground, thereby at least solving the problems of complicated disassembly, slow speed, low accuracy of test results, and high safety risk of test personnel in the prior art.

[0062] According to an aspect of the embodiments of the present application, a short-circuit device for temperature rise test of a single-phase transformer is provided. The short-circuit device for temperature rise test of a single-phase transformer comprises an insulating sleeve, an isolation knife switch, and a first motor.

[0063] The insulating sleeve includes a plurality of first insulators and a plurality of second insulators, the top of the plurality of first insulators is connected to each other to form a first terminal, the top of the plurality of second insulators is connected to each other to form a second terminal, and the first terminal and the second terminal are connected to two ends of a short-circuit winding of a single-phase transformer respectively. An isolation knife switch is located between the first terminal and the second terminal, and the isolation knife switch can be switched between a first position of short-circuiting the first terminal and the second terminal and a second position of disconnecting the first terminal and the second terminal. A first motor is connected to the isolation knife switch, and the first motor is connected to a remote control box through a first cable. The isolation knife switch is switched between the first position and the second position by rotation of the first motor under the control of the remote control box.

[0064] Figure 1 is a front view of a short-circuit device 10 for a temperature rise test of a single-phase transformer of the utility model, and Figure 2 is a right side view of the short-circuit device 10 for the temperature rise test of the single-phase transformer of the utility model in a closed state of the isolation knife switch 102.

[0065] As Figure 1 and Figure 2 shown, the short-circuit device 10 for the temperature rise test of the single-phase transformer of the utility model includes an insulating sleeve 100, an isolation knife switch 102 and a first motor 104. The insulating sleeve 100 includes a plurality of first insulators 1002 and a plurality of second insulators 1004, the top of the plurality of first insulators 1002 is connected to each other to form a first terminal 100A, the top of the plurality of second insulators 1004 is connected to each other to form a second terminal 100B, the first terminal 100A and the second terminal 100B are connected to two ends of a short-circuit winding of a single-phase transformer respectively, and the bottom of the plurality of first insulators 1002 and the bottom of the plurality of second insulators 1004 are fixed on an insulating frame 114 (shown below). The isolation knife switch 102 is located between the first terminal 100A and the second terminal 100B, and the isolation knife switch 102 can be switched between a first position of short-circuiting the first terminal 100A and the second terminal 100B and a second position of disconnecting the first terminal 100A and the second terminal 100B. Wherein, the first insulator 1002 and the second insulator 1004 include a metal rod and an insulating material coated on the metal rod, and the first insulator 1002 and the second insulator 1004 are in the shape of an umbrella skirt. Note that the insulating material coated on the metal rod includes glass or ceramic, but the present example is not limited thereto.

[0066] It should be noted that the number of first insulators 1002 and second insulators 1004 depends on the magnitude of the current flowing through the insulating sleeve 100. The greater the current, the greater the number of first insulators 1002 and second insulators 1004. Typically, the number of first insulators 1002 and second insulators 1004 is two each, but this is not a limitation in this example. Furthermore, the number of first insulators 1002 and second insulators 1004 should be equal to ensure that the magnitude of the current flowing through them is consistent, reducing the current-limiting effect and improving the stability and balance of the insulating sleeve 100. Alternatively, the number of first insulators 1002 and second insulators 1004 can be different. However, in this case, the magnitude of the current flowing through them is determined by the smallest number of first insulators 1002 and second insulators 1004, resulting in a greater current-limiting effect and deteriorating the stability and balance of the insulating sleeve 100.

[0067] Furthermore, the first motor 104 is connected to the isolation switch 102 and is connected to the remote control box 106 via a first cable. The isolation switch 102 is switched between the first position and the second position by the rotation of the first motor 104 under the control of the remote control box 106.

[0068] It should be noted that the length of the first cable depends on the height of the insulating bracket 116 of the short-circuit device 10 and the height of the single-phase transformer. Specifically, the length of the first cable is typically at least 5 meters longer than the sum of the heights of the insulating bracket 116 of the short-circuit device 10 and the single-phase transformer. This ensures that the remote control box 106 can be flexibly placed on the ground and that there is sufficient distance to ensure the safety of test personnel. It should be understood that the cable length of the first cable mentioned here is only an example, and the specific length should be set according to the actual situation of the single-phase transformer temperature rise test.

[0069] Specifically, if Figure 1 As shown, before the temperature rise test, one end of the isolation switch 102 is connected to the first terminal 100A of the insulating sleeve 100, and the other end is disconnected from the second terminal 100B of the insulating sleeve 100 (at this time, the isolation switch 102 is in the second position). Before the temperature rise test, the remote control box 106 is placed in a safe place on the ground, and the remote control box 106 is energized so that the other end of the isolation switch 102 is closed with the second terminal 100B of the insulating sleeve 100 by the rotation of the first motor 104 under the control of the remote control box 106 (at this time, the isolation switch 102 is in the first position). When the temperature rise test is powered on and the resistance is ready to be measured, the test personnel wait in a safe place on the ground for the transformer to be powered off and then use the remote control box 106 to remotely control the opening of the isolation switch 102, and then directly measure the resistance.

[0070] In this way, the short-circuit device 10 of the embodiment of the utility model is under the control of the remote control box 106. The isolating knife switch 102 is switched between the first position and the second position by rotating the first motor 104 to realize the short-circuiting and disconnection of the first terminal 100A and the second terminal 100B, thereby realizing the function of remotely controlling the closing and opening of the short-circuit device 10, thereby making the short-circuited winding of the temperature rise test transformer short-circuited, closed and opened, shortening the operation time, improving the accuracy of the test results, and reducing the risk of electric shock and burns to the test personnel.

[0071] According to an exemplary embodiment of the present invention, the first terminal includes a first isolation switch connection end and a first shorting winding connection end, and the second terminal includes a second isolation switch connection end and a second shorting winding connection end. The first and second terminals are respectively connected to the two ends of the shorting winding of a single-phase transformer, including: the first shorting winding connection end of the first terminal is connected to the first end of the shorting winding of the single-phase transformer via copper wire and bolts, and the second shorting winding connection end of the second terminal is connected to the second end of the shorting winding of the single-phase transformer via copper wire and bolts. One end of the isolation switch is pivotally connected to the first isolation switch connection end via a fixed rod. The isolation switch is capable of switching between a first position shorting the first and second terminals and a second position disconnecting the first and second terminals, including: the isolation switch pivotally moves about the fixed rod between a first position and a second position, wherein when the isolation switch is in the first position, the other end of the isolation switch is connected to the second isolation switch connection end of the second terminal, and when the isolation switch is in the second position, the other end of the isolation switch is disconnected from the second isolation switch connection end of the second terminal.

[0072] Specifically, if Figure 1 and Figure 2As shown, the first terminal 100A includes a first isolation knife switch connecting end 100A1 and a first short-circuit winding connecting end 100A2, and the second terminal 100B includes a second isolation knife switch connecting end 100B1 and a second short-circuit winding connecting end 100B2. One end of the isolation knife switch 102 is pivotally connected to the first isolation knife switch connecting end 100A1 of the first terminal 100A through a fixed rod, and the other end of the isolation knife switch 102 is connected to or disconnected from the second isolation knife switch connecting end 100B1 of the second terminal 100B. Specifically, when the isolation knife switch 102 is in a first position for short-circuiting the first terminal 100A and the second terminal 100B, one end of the isolation knife switch 102 is pivotally connected to the first isolation knife switch connecting end 100A1 of the first terminal 100A through the fixed rod, and the other end of the isolation knife switch 102 is connected to the second isolation knife switch connecting end 100B1 of the second terminal 100B, and when the isolation knife switch 102 is in a second position for disconnecting the first terminal 100A and the second terminal 100B, one end of the isolation knife switch 102 is pivotally connected to the first isolation knife switch connecting end 100A1 of the first terminal 100A through the fixed rod, and the other end of the isolation knife switch 102 is disconnected from the second isolation knife switch connecting end 100B1 of the second terminal 100B. That is, the isolation knife switch 102 is pivoted from the first position to the second position around the fixed rod.

[0073] In addition, the first short-circuit winding connecting end 100A2 of the first terminal 100A and the second short-circuit winding connecting end 100B2 of the second terminal 100B are connected to two ends of the short-circuit winding of the single-phase transformer through copper wires and bolts, respectively, but the connection mode of the first short-circuit winding connecting end 100A2 and the second short-circuit winding connecting end 100B2 to the short-circuit winding of the single-phase transformer is not limited. For example, the first short-circuit winding connecting end 100A2 connects a first end (a leading end) of the short-circuit winding, the second short-circuit winding connecting end 100B2 connects a second end (a trailing end) of the short-circuit winding, or the first short-circuit winding connecting end 100A2 connects the second end of the short-circuit winding, and the second short-circuit winding connecting end 100B2 connects the first end of the short-circuit winding.

[0074] In this way, in the short-circuit device 10 of the embodiment of the utility model, the first short-circuit winding connecting end 100A2 of the first terminal 100A and the second short-circuit winding connecting end 100B2 of the second terminal 100B are connected to two ends of the short-circuit winding of the single-phase transformer through copper wires and bolts, respectively, thereby realizing the connection of the first terminal 100A and the second terminal 100B to the short-circuit winding. In addition, one end of the isolation knife switch 102 is pivotally connected to the first isolation knife switch connecting end 100A1 of the first terminal 100A through a fixed rod, and the other end is connected to or disconnected from the second isolation knife switch connecting end 100B1 of the second terminal 100B, thereby realizing the short-circuiting and disconnecting of the first terminal 100A and the second terminal 100B, and realizing the functions of closing and opening of the short-circuit device 10.

[0075] According to the exemplary embodiment of the utility model, the short circuit device further comprises a telescopic rod, the isolating knife switch is connected to the first motor through the telescopic rod, and the isolating knife switch is switched between the first position and the second position under the control of the remote control box through the rotation of the first motor, and the switching comprises: when the remote control box is powered on and the closing button is pressed, the first motor rotates, the isolating knife switch is switched to the first position through the pulling action of the telescopic rod, and when the remote control box is powered on and the opening button is pressed, the first motor rotates, and the isolating knife switch is switched to the second position through the lifting action of the telescopic rod.

[0076] Specifically, as shown in Figure 1 The short circuit device 10 further comprises a telescopic rod 108, the isolating knife switch 102 is connected to the first motor 104 through the telescopic rod 108, and the isolating knife switch 102 is switched between the first position and the second position under the control of the remote control box 106 through the rotation of the first motor 104, and the switching comprises: when the remote control box 106 is powered on and the closing button is pressed, the first motor 104 rotates, the isolating knife switch 102 is switched to the first position of short-circuiting the first terminal 100A and the second terminal 100B through the pulling action of the telescopic rod 108, and when the remote control box 106 is powered on and the opening button is pressed, the first motor 104 rotates, and the isolating knife switch 102 is switched to the second position of disconnecting the first terminal 100A and the second terminal 100B through the lifting action of the telescopic rod 108. In addition, it should be noted that the telescopic rod 108 is a solid rod with an insulating ceramic surface and an insulating umbrella skirt, but the present example is not limited thereto, and the surface umbrella skirt insulating ceramic can increase the creepage distance, so that the telescopic rod 108 can withstand higher voltage and is not easily punctured.

[0077] In this way, the short circuit device 10 of the utility model embodiment is controlled by the remote control box 106, and the isolating knife switch 102 is switched between the first position and the second position under the pulling action and the lifting action of the telescopic rod 108 through the rotation of the first motor 104, so that the closing and opening functions of the short circuit device 10 are realized.

[0078] According to the exemplary embodiment of the utility model, the short circuit device further comprises a grounding rod and a second motor, one end of the grounding rod is connected to the second motor, the second motor is connected to the remote control box through a second cable, and the other end of the grounding rod is connected or disconnected with the first isolating knife switch connecting end of the first terminal of the insulating sleeve under the control of the remote control box through the rotation of the second motor.

[0079] As Figure 1 and Figure 2As shown, the short-circuit device 10 further comprises a grounding rod 110 and a second motor 112, one end of the grounding rod 110 is connected to the second motor 112, the second motor 112 is connected to the remote control box 106 through a second cable, and the other end of the grounding rod 110 is connected or disconnected with the first isolation knife switch connection end 100A1 of the first terminal 100A of the insulating sleeve 100 under the control of the remote control box 106 through the rotation of the second motor 112.

[0080] In addition, it should be noted that the cable length of the first cable is approximately equal to the cable length of the second cable, and the cable length of the second cable depends on the height of the insulating support 116 of the short-circuit device 10 and the height of the single-phase transformer. Specifically, the cable length of the second cable is usually at least 5m longer than the length sum of the height of the insulating support 116 of the short-circuit device 10 and the height of the single-phase transformer, to ensure that the remote control box 106 can be placed flexibly on the ground and there is enough distance to ensure the safety of the test personnel. It should be understood that the cable length of the second cable mentioned here is only an example, and the specific length is set according to the actual situation of the single-phase transformer temperature rise test.

[0081] In this way, under the control of the remote control box 106, the short-circuit device 10 of the embodiment of the utility model connects or disconnects the grounding rod 110 with the first isolation knife switch connection end 100A1 of the first terminal 100A of the insulating sleeve 100 through the rotation of the second motor 112, so as to realize the grounding or non-grounding of the first terminal 100A and the isolation knife switch 102, to ensure that there is no charge on the isolation knife switch 102 when the short-circuit device 10 is disconnected for resistance measurement, and the isolation knife switch 102 and the insulating support 116 are connected to the same potential.

[0082] According to the exemplary embodiment of the utility model, in the temperature rise test of the single-phase transformer, when the short-circuit winding is closed for temperature rise test, the other end of the grounding rod is disconnected with the first isolation knife switch connection end of the first terminal, and when the short-circuit winding is opened for resistance measurement, the other end of the grounding rod is connected with the first isolation knife switch connection end of the first terminal.

[0083] In the temperature rise test of the single-phase transformer, because of the compensation capacitor group limitation, the short-circuit winding of the transformer is not grounded, and when the resistance is measured after the temperature rise test is completed, the short-circuit winding of the transformer is opened. Specifically, in the temperature rise test of the single-phase transformer, when the short-circuit winding is closed for temperature rise test, the other end of the grounding rod 110 is disconnected with the first isolation knife switch connection end 100A1 of the first terminal 100A, and when the short-circuit winding is opened for resistance measurement after the temperature rise test is completed, the other end of the grounding rod 110 is connected with the first isolation knife switch connection end 100A1 of the first terminal 100A.

[0084] In this way, in the short circuit device 10 of the embodiment of the utility model, when the short circuit winding is closed and powered to perform the temperature rise test, the other end of the grounding rod 110 is disconnected from the first isolation knife switch connection end 100A1 of the first terminal 100A, and when the temperature rise test is powered off and the short circuit winding is opened to perform resistance measurement, the other end of the grounding rod 110 is connected to the first isolation knife switch connection end 100A1 of the first terminal 100A, so that whether the first terminal 100A and the isolation knife switch 102 are connected to the same potential through the grounding rod 110 is controlled, to ensure that there is no residual charge on the isolation knife switch 102.

[0085] According to the exemplary embodiment of the utility model, the first motor is connected to the second motor through a circuit interlocking mechanism, wherein when the first motor is powered to control the isolation knife switch to close, the second motor controls the grounding rod to disconnect, and when the first motor is powered to control the isolation knife switch to open, the second motor controls the grounding rod to ground.

[0086] Specifically, as shown in Figure 1 , the first motor 104 and the second motor 112 are both connected to the remote control box 106, and the first motor 104 and the second motor 112 realize electrical interlocking through relays in the remote control box 106, but the way in which the first motor 104 and the second motor 112 realize electrical interlocking is not limited thereto.

[0087] In this way, in the short circuit device 10 of the embodiment of the utility model, the first motor 104 is connected to the second motor 112 through a circuit interlocking mechanism, realizing electrical interlocking of the first motor 104 and the second motor 112, so that the first motor 104 and the second motor 112 cannot be driven to close at the same time, to ensure safe operation of the first motor 104 and the second motor 112.

[0088] According to the exemplary embodiment of the utility model, the short circuit device further comprises an insulating frame for fixing the insulating sleeve.

[0089] As shown in Figure 1 and Figure 2 , the short circuit device 10 further comprises an insulating frame 114 for fixing the insulating sleeve 100 by bolts, but the present example is not limited thereto. In addition, the insulating frame 114 can be made of 304 stainless steel, because the short circuit device 10 has a large current flow, which can cause magnetic leakage phenomenon and thus thermal loss, and the 304 stainless steel is low magnetic steel, which has very small magnetic leakage loss, reduces heat generation, and thus reduces thermal loss, but the material of the insulating frame 114 is not limited thereto.

[0090] In this way, in the short circuit device 10 of the embodiment of the utility model, the insulating sleeve 100 is fixed by the insulating frame 114.

[0091] According to the exemplary embodiment of the utility model, the short circuit device further comprises an insulating support, the insulating support comprises a rigid main body, a first end portion and a second end portion at two ends of the rigid main body, the first end portion of the insulating support is fixed on the upper surface of the oil tank of the single-phase transformer, and the second end portion of the insulating support supports the insulating frame.

[0092] As shown in Figure 1 and Figure 2 The short circuit device 10 further comprises an insulating support 116, the insulating support 116 comprises a rigid main body 1162, a first end portion 1164 and a second end portion 1166 at two ends of the rigid main body 1162, the first end portion 1164 of the insulating support 116 is fixed on the upper surface of the oil tank of the single-phase transformer, and the second end portion 1166 of the insulating support 116 supports the insulating frame 114. Specifically, the insulating support 116 can be made of 201 stainless steel, because the hardness of 201 stainless steel is high, which plays a good supporting role, but the material of the insulating support 116 is not limited thereto.

[0093] It should be noted that the first end portion 1164 of the insulating support 116 can be fixed only on the upper surface of the oil tank of the single-phase transformer, but cannot be fixed on the side surface of the single-phase transformer, that is, the short circuit device 10 can be fixed only on the upper surface of the oil tank of the single-phase transformer through the first end portion 1164 of the insulating support 116, but cannot be fixed on the side surface of the single-phase transformer. This is because the insulating support 116 is fixed on the single-phase transformer by a band, rather than being fixed on the single-phase transformer by a bolt, if the insulating support 116 is fixed on the side surface of the single-phase transformer, the stability of the structure is poor, the height of the terminal of the insulating sleeve 100 to the oil tank is not high enough, and the insulating sleeve 100 cannot play a good insulating role, which leads to that the short circuit device 10 is not resistant to high pressure and is easy to be broken down, and also affects the supporting role of the insulating sleeve 100 to the isolation knife switch 102.

[0094] In this way, in the short circuit device 10 of the utility model embodiment, the short circuit device 10 is fixed on the upper surface of the single-phase transformer through the first end portion 1164 of the insulating support 116 of the short circuit device 10, and the insulating frame 114 is supported through the second end portion 1166 of the insulating support 116, so as to realize the stable connection of the short circuit device 10 and the single-phase transformer.

[0095] According to the exemplary embodiment of the utility model, the insulating support further comprises a warning light for indicating whether the short circuit device is electrified.

[0096] Specifically, when the warning light 118 is red, it indicates that the short circuit device 10 is electrified, and when the warning light 118 is green, it indicates that the short circuit device 10 is not electrified.

[0097] In this way, in the short-circuit device 10 of the embodiment of the utility model, whether the short-circuit device 10 is electrified is indicated by the warning light 118, to ensure the safety of the tester.

[0098] According to the exemplary embodiment of the utility model, the remote control box further comprises an emergency trip button for controlling the remote control box to be powered off.

[0099] Specifically, when the display lamp is red, it indicates that the isolating knife switch 102 is closed and in a short-circuit state, and when the display lamp is green, it indicates that the isolating knife switch 102 is open and in an open state.

[0100] In this way, in the short-circuit device 10 of the embodiment of the utility model, the short-circuit and open states of the isolating knife switch 102 are directly displayed by the display lamp.

[0101] According to the exemplary embodiment of the utility model, the remote control box further comprises an emergency trip button for controlling the remote control box to be powered off.

[0102] Specifically, when an emergency danger occurs, the emergency trip button can be pressed to control the remote control box 106 to be powered off.

[0103] In this way, in the short-circuit device 10 of the embodiment of the utility model, the remote control box 106 is powered off by the emergency trip button to achieve safety control.

[0104] According to the exemplary embodiment of the utility model, the rated current and the rated voltage of the short-circuit device are set according to the test current and the test voltage of the temperature rise test of the single-phase transformer, respectively.

[0105] Specifically, the rated current of the short-circuit device 10 is not higher than 10000A, and the rated voltage of the short-circuit device 10 to the ground is not higher than 100kV, but the present example is not limited thereto, as long as the rated current and the rated voltage of the short-circuit device 10 cover all the temperature rise test current ranges and all the temperature rise test voltage ranges of all the single-phase transformers to which the short-circuit device 10 is applied.

[0106] In this way, in the short-circuit device 10 of the embodiment of the utility model, the rated current and the rated voltage of the short-circuit device 10 are set according to the test current and the test voltage of the temperature rise test of the single-phase transformer, respectively, so that the rated current and the rated voltage of the short-circuit device 10 cover all the temperature rise test current ranges and all the temperature rise test voltage ranges of all the single-phase transformers to which the short-circuit device 10 is applied.

[0107] In the embodiment of the utility model, provide short circuit device for single phase transformer temperature rise test, it adopts the technical scheme that isolation switch is switched between the first position of short circuit first terminal and second terminal and the second position of disconnect first terminal and second terminal under the control of remote control box through the rotation of first motor, can avoid the test personnel to climb close to the short circuit winding of live transformer, can realize the function that short circuit device is closed and opened in the safe ground remote control, so that the short circuit winding of temperature rise test transformer is short circuit closed or opened, to at least solve the problem that the temperature rise test circuit in the prior art is cumbersome, slow, the accuracy of test result is low, the test personnel faces great safety risk.

[0108] In the above embodiments of the utility model, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0109] In the several embodiments provided by the utility model, it should be understood that the disclosed technology can be implemented in other ways. Among them, the device embodiments described above are only schematic, for example, the division of units or modules is only a logical function division, and actual implementation can have another division way, for example, a plurality of units or modules or components can be combined or integrated into another system, or some features can be ignored or not executed.

[0110] In addition, each functional unit or module in each embodiment of the utility model can be integrated in a processing unit or module, or each unit or module can exist physically, or two or more units or modules can be integrated in a unit or module.

[0111] The above is only the preferred embodiment of the utility model, and it should be pointed out that for ordinary skilled person in the art, without departing from the principle of the utility model, several improvements and refinements can be made, and these improvements and refinements should be regarded as the protection scope of the utility model.

Claims

1. A short-circuit device (10) for a temperature rise test of a single-phase transformer, characterized in that: include: An insulating sleeve (100) comprises a plurality of first insulators (1002) and a plurality of second insulators (1004), wherein the tops of the plurality of first insulators (1002) are connected to each other to form a first terminal (100A), and the tops of the plurality of second insulators (1004) are connected to each other to form a second terminal (100B), and the first terminal (100A) and the second terminal (100B) are respectively connected to two ends of the short-circuited winding of the single-phase transformer. an isolating knife switch (102), located between the first terminal (100A) and the second terminal (100B), and the isolating knife switch (102) is capable of switching between a first position for short-circuiting the first terminal (100A) and the second terminal (100B) and a second position for disconnecting the first terminal (100A) and the second terminal (100B); and A first motor (104), the first motor (104) is connected to the isolation switch (102), and the first motor (104) is connected to a remote control box (106) via a first cable; wherein, The isolation knife switch (102) is switched between the first position and the second position by the rotation of the first motor (104) under the control of the remote control box (106).

2. The short-circuit device (10) for temperature rise test of a single-phase transformer according to claim 1, characterized in that: The first terminal (100A) includes a first isolation knife switch connection end (100A1) and a first short-circuit winding connection end (100A2) on the top side, and the second terminal (100B) includes a second isolation knife switch connection end (100B1) and a second short-circuit winding connection end (100B2) on the top side, wherein: The first terminal (100A) and the second terminal (100B) are respectively connected to the two ends of the short-circuited winding of the single-phase transformer, including: the first short-circuited winding connection end (100A2) of the first terminal (100A) is connected to the first end of the short-circuited winding of the single-phase transformer through a copper wire and a bolt, and the second short-circuited winding connection end (100B2) of the second terminal (100B) is connected to the second end of the short-circuited winding of the single-phase transformer through a copper wire and a bolt.

3. The short-circuit device (10) for temperature rise test of a single-phase transformer according to claim 2, characterized in that: One end of the isolation knife switch (102) is pivotally connected to the first isolation knife switch connection end (100A1) via a fixed rod, and the isolation knife switch (102) is capable of switching between a first position for short-circuiting the first terminal (100A) and the second terminal (100B) and a second position for disconnecting the first terminal (100A) and the second terminal (100B), comprising: the isolation knife switch pivotally moves around the fixed rod between the first position and the second position, wherein, When the isolation knife switch (102) is in the first position, the other end of the isolation knife switch (102) is connected to the second isolation knife switch connection end (100B1), and When the isolation knife switch (102) is in the second position, the other end of the isolation knife switch (102) is disconnected from the second isolation knife switch connection end (100B1).

4. The short-circuit device (10) for temperature rise test of a single-phase transformer according to claim 3, characterized in that: The short-circuit device (10) further comprises a telescopic rod (108), the isolating knife switch (102) is connected to the first motor (104) via the telescopic rod (108), and the isolating knife switch (102) is switched between the first position and the second position by the rotation of the first motor (104) under the control of the remote control box (106), comprising: When the remote control box (106) is powered on and the closing button is pressed, the first motor (104) rotates, and the isolation knife switch (102) is switched to the first position by the downward pull of the telescopic rod (108), and When the remote control box (106) is powered on and the trip button is pressed, the first motor (104) rotates, and the isolation knife switch (102) is switched to the second position through the lifting action of the telescopic rod (108).

5. The short-circuit device (10) for temperature rise test of a single-phase transformer according to claim 4, characterized in that: The short-circuit device (10) further comprises a grounding rod (110) and a second motor (112), one end of the grounding rod (110) being connected to the second motor (112), the second motor (112) being connected to the remote control box (106) via a second cable, and the other end of the grounding rod (110) being connected to or disconnected from the first isolation switch connection end (100A1) of the first terminal (100A) of the insulating sleeve (100) by the rotation of the second motor (112) under the control of the remote control box (106).

6. The short-circuit device (10) for temperature rise test of a single-phase transformer according to claim 5, characterized in that: In the temperature rise test of the single-phase transformer, when the short-circuited winding switch is subjected to the temperature rise test, the other end of the grounding rod (110) is disconnected from the first isolation switch connection end (100A1) of the first terminal (100A), and When the short-circuited winding is switched off for resistance measurement, the other end of the grounding rod (110) is connected to the first isolation switch connection end (100A1) of the first terminal (100A).

7. The short-circuit device (10) for temperature rise test of a single-phase transformer according to claim 5, characterized in that: The first motor (104) is connected to the second motor (112) via a circuit interlocking mechanism, wherein: When the first motor (104) is powered on to control the isolating knife switch (102) to close, the second motor (112) controls the grounding rod (110) to open, and When the first motor (104) is powered on to control the isolating knife switch (102) to open, the second motor (112) controls the grounding rod (110) to be grounded.

8. The short-circuit device (10) for temperature rise test of a single-phase transformer according to claim 1, characterized in that: The short-circuit device (10) further includes an insulating frame (114) for fixing the insulating sleeve (100).

9. The short-circuit device (10) for temperature rise test of a single-phase transformer according to claim 8, characterized in that: The short-circuit device (10) further includes an insulating bracket (116), the insulating bracket (116) including a rigid body (1162), a first end portion (1164) and a second end portion (1166) at both ends of the rigid body (1162), the first end portion (1164) of the insulating bracket (116) being fixed to the upper surface of the oil tank of the single-phase transformer, and the second end portion (1166) of the insulating bracket (116) supporting the insulating frame (114).

10. The short-circuit device (10) for temperature rise test of a single-phase transformer according to claim 9, characterized in that: The insulating bracket (116) further includes a warning light (118) for indicating whether the short-circuit device (10) is energized.

11. The short-circuit device (10) for temperature rise test of a single-phase transformer according to claim 1, characterized in that: The remote control box (106) includes a display light indicating the short-circuit and disconnection states of the isolation switch (102).

12. The short-circuit device (10) for temperature rise test of a single-phase transformer according to claim 11, characterized in that: The remote control box (106) further comprises an emergency trip button for controlling power off of the remote control box (106).

13. The short-circuit device (10) for temperature rise test of a single-phase transformer according to claim 1, characterized in that: The rated current and rated voltage of the short-circuit device (10) are respectively set according to the test current and test voltage of the temperature rise test of the single-phase transformer.

Images