RU138399U1 - MEASURING OUTPUT OF HIGH VOLTAGE INPUT INSULATION PARAMETERS - Google Patents

Abstract

A measuring output of the insulation parameters of the high-voltage input of the transformer, comprising a housing in the body of which an insulator is installed, the conductive element of which from one of its ends is made in the form of a pin protruding beyond its dimensions, and from the opposite end in the form of a flexible conductor protruding beyond its dimensions, having a constant electrical contact with the external leveling lining of the input frame, the housing is equipped with a removable protective cap with a contact element attached to its inner wall with a flexible cable, when The end face of the output housing has openings interacting with a pin of a contact element provided with an opening for interaction with an insulator stud.

Description

Technical field

The proposed utility model relates to electrical engineering, and relates to the diagnosis of the insulation state of the cores of high-voltage bushings for transformers used on high-voltage power lines.

State of the art

The prior art devices for diagnosing the insulation state of the cores of high voltage bushings during their operation.

The mentioned devices, as a rule, are an electrical connection accessible from the outside of the high-voltage input, isolated from the flange or other mounting device and made to one of the external conductive layers of the capacitor input for measuring the dielectric loss tangent, capacitance and partial discharge with the grounded input flange.

A device is known for controlling an increased electric field in an insulating synthetic material (see RU 2488183, class H01B 1/00, publ. 07.20.2013).

A known device for monitoring the electric field of a sealed current input uses a mass of synthetic insulating material cast by casting around the central conductor, and a grounded shield surrounding this mass at a certain distance, determined depending on the voltage applied to the current input.

The known device is reliable in operation, easy to manufacture and has reduced production costs, however, the known device is not intended to monitor the state of its insulation in operation, but only monitors the high electric field using a mass of synthetic material.

The prior art polymer insulator with monitoring the state of insulation (see RU 2392678, CL H01B 17/00, publ. 06/20/2010).

The known invention during operation allows timely detection and elimination of existing and emerging defects in polymer insulation, thanks to the control element of the insulator, located between the insulating carrier body and the metal reinforcement of the insulator. The specified control element is made of tempered electrical glass, which collapses during operation while reducing the electrical insulation properties of the supporting body. The internal electric strength of the control element before destruction is less than the electric strength of its air gap, and the mechanical strength of the control element after destruction is sufficient for the operation of the insulator.

The presence of a control element in this insulator complicates and increases the cost of manufacturing the insulator, in addition, the transportation process and the process of installing the insulator to the transformer are complicated.

The closest analogue of the proposed measurement output of the isolation of the high-voltage input is a status indicator (see RU 2392679, class H01B 17/00, publ. 06/20/2010).

The well-known indicator of the state of high-voltage insulation is made of tempered electrical glass. The internal electric strength of the indicator is less than the electric strength of its external air gap.

During the operation of high-voltage bushings, the state of insulation, which is determined by the indicated indicator of the state of high-voltage insulation, when its dielectric properties decrease, the indicator is destroyed as a result of internal breakdown, signaling the failure of the controlled insulation. This method of monitoring the isolation of the high voltage input is effective and reliable, however, it is associated with regular technical visual inspection and maintenance related to the replacement of the status indicator due to its highly probable self-destruction.

Utility Model Disclosure

The objective of the proposed utility model is to increase reliability during operation while increasing the life of high-voltage bushings.

The technical result of the proposed utility model is the creation of a device for diagnosing the insulation parameters of the high voltage input, which allows visual and instrumental control of the reliability of its correct grounding, while maintaining the grounding constancy necessary to prevent possible damage to the high voltage input.

The specified task and the technical result are achieved by the fact that the measurement output of the insulation parameters of the high-voltage input of the transformer contains a body in the body of which an insulator is installed, a conductive element, which, from one of its ends, is made in the form of a pin protruding beyond its dimensions, and from the opposite end is made in the form of a flexible conductor protruding beyond its dimensions, having constant electrical contact with the external equalization lining of the input core, the housing is equipped with a removable protective cap with contact m element 5, attached to its inner wall by a flexible cable, while the end of the output housing has holes that interact with the pin of the contact element, equipped with a hole for interaction with the insulator stud.

One of the requirements for high-voltage bushings of transformers is the ability to control the state of their insulation in operation.

The proposed design of the device for monitoring the state of the insulation parameters of the high voltage input has a constant electrical contact with the extreme peripheral lining of the core. Under normal operating conditions of the transformer bushings, the test lead (device for monitoring the state of insulation) must be permanently grounded, otherwise, within a sufficiently short time, the high-voltage bush will be damaged.

Grounding is carried out using a contact element. The contact element has a pin and a hole equipped with multi-contacts. The pin is inserted into the hole made in the housing of the measuring output, and the hole of the contact element is put on the insulator stud.

The test lead is sealed by screwing a removable protective cap onto the test lead housing until the sealing ring is placed along the housing perimeter.

The contact of the test lead with the last (grounded) equalization lining of the insulation of the input core is ensured by soldering a flexible, preferably copper conductor. One end of the flexible conductor is soldered to the last grounded equalizing plate, and the other end passes through the through hole in the stud of the insulator of the measuring output and is soldered to its outer end, providing reliable electrical contact and sealing the internal cavity of the measuring output.

To avoid contact loss, in the case of removing the protective cap from the housing of the measuring output for visual or instrumental control, the inner wall of the removable protective cap is equipped with a flexible cable connected to the contact element, which is extremely undesirable to disconnect from the housing. In addition, a flexible cable is necessary to exclude the possibility of screwing the protective cap without installing the contact element, because a flexible cable will not physically allow the screw cap to be screwed in.

These distinctive features of the proposed device for monitoring the state of the insulation parameters of the core of the high voltage input allow visual and, if necessary, instrumental control of its correct grounding, while preventing its involuntary grounding, thereby ensuring its permanent grounding, which is necessary to prevent damage to the high voltage input.

Brief Description of the Drawings

In FIG. 1 shows an option for attaching to a high-voltage input of a device for monitoring the state of insulation parameters of a high-voltage input with a protective cap screwed in;

In FIG. Figure 2 shows an option for attaching to a high-voltage input of a device for monitoring the state of insulation parameters of a high-voltage input with a protective cap removed.

Utility Model Implementation

The measuring output of the insulation parameters of the high-voltage input of the transformer contains a removable protective cap 1, housing 2, insulator stud 3, flexible cable of the removable protective cap 4, contact element 5, the sealing ring of the housing 6, insulator 7, flexible conductor 8, housing openings 9, pin of the contact element 10 and the hole of the contact element 11.

The proposed measurement output of the insulation parameters of the high-voltage input of the transformer contains a housing 2 in the body of which the insulator is installed 7. The conductor element of the insulator 7 is made in the form of a stud 3 protruding beyond its dimensions, and made from the opposite end in the form of a flexible protruding beyond its dimensions preferably copper conductor 8. The conductor element is located inside the insulator 7 and is integral with it. The flexible conductor 8 is in constant electrical contact with the external equalization lining 12 of the core. The housing 2 is equipped with a removable protective cap 1 with a contact element 5, which is attached to the inner wall of the housing 2 by a flexible cable 4. In this case, the end face of the output housing 2 has holes 9 interacting with the pin 10 of the contact element 5. The contact element 5 is provided with an opening 11 for interacting with hairpin 3 insulators 7.

The measurement output of the insulation parameters of the high voltage input works as follows.

To realize the main purpose of the measurement output, which is to enable measurement of the insulation state of the core of the high-voltage input, it is first necessary to disconnect the high operating voltage, then it is necessary to unscrew the protective cap 1 from the housing 2, remove the contact element 5 and connect external measuring devices to the insulator stud 3, in particular, devices for measuring the tangent of the dielectric loss angle and insulation capacity, and accordingly during measurement of insulation parameters, measure The output is grounded.

After carrying out the necessary measurements, the external measuring devices are turned off, the contact element 5 is put on the stud 3 of the insulator 7, and the grounding of the measuring output can be checked visually or, if necessary, instrumentally (for example, with a megohmmeter). After which, and in particular for sealing the measuring output, the protective cap 2 is screwed onto the housing 2 until the sealing ring 6 is pressed.

Grounding is carried out using a contact element 5 having a pin 10 and a hole 11 provided with multi-contacts. The pin 10 of the contact element 5 is inserted into one of the holes 9 of the test lead body 2, which has ground potential, and the hole 11 of the contact element 5 is put on the stud 3 of the insulator 7. The test lead is sealed by screwing the protective removable cap 1 on the test lead case 2 until preloading the sealing ring 6. During visual or instrumental monitoring of the grounding of the measuring output, for example, when removing the protective cap 1, the flexible cable 4 eliminates physical loss of contact , Thereby maintaining the grounding necessary to prevent damage to the high voltage bushing. In addition, the flexible cable 4 also serves to exclude the possibility of screwing the protective cap 1 without installing the contact element 5, the actual flexible cable 4 physically will not allow screwing the protective removable cap 1.

The device for monitoring the state of the parameters of the high-voltage input has constant electrical contact with the extreme peripheral lining of the core 12. Under normal conditions of operation of the transformer inputs, the measuring terminal (device for monitoring the insulation state) must be permanently grounded, otherwise, a sufficiently short time may occur damage to the high voltage input.

Thus, due to the fact that the device for controlling the insulation parameters of the high-voltage input of the transformer contains a housing 2 in the body of which the insulator 7 is installed, the conductor element of the insulator 7 from one of its ends is made in the form that protrudes beyond its dimensions of the stud 3, from the opposite end of the insulator 7, the conductor element is made in the form of a flexible conductor protruding beyond its dimensions 8, the stud 3 of the insulator 7 has constant electrical contact with the external equalizing plate 12 of the core, the housing 2 is equipped with a removable shield the final cap 1 with the contact element 5, and also due to the fact that the contact element 5 is attached to the inner wall of the protective cap 1 by a flexible cable 4, while the end of the output housing has holes 9 that interact with the pin 10 of the contact element 5, equipped with a hole 11 for interaction with stud 3 of insulator 7, it is provided:

1. The possibility of visual and instrumental control of the reliability of the grounding of the measuring output;

2. Prevention of grounding, ie Providing permanent grounding to prevent damage to the high voltage input.

As a result, the problem is solved, which consists in increasing reliability during operation and increasing the life of high-voltage bushings of transformers.

The proposed utility model can be widely used in industry, namely in the electric power industry, and can be used to measure the dielectric loss tangent, capacitance, and partial discharge of the cores of high voltage bushings for transformers used on high voltage power lines.

Claims (1)

A measuring output of the insulation parameters of the high-voltage input of the transformer, comprising a housing in the body of which an insulator is installed, the conductive element of which from one of its ends is made in the form of a pin protruding beyond its dimensions, and from the opposite end in the form of a flexible conductor protruding beyond its dimensions, having a constant electrical contact with the external leveling lining of the input frame, the housing is equipped with a removable protective cap with a contact element attached to its inner wall with a flexible cable, when The end face of the output housing has openings interacting with a pin of a contact element provided with an opening for interaction with an insulator stud.

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