KR20230151386A - Bushing tap adapter and bushing tap floating troubleshooting system - Google Patents

Abstract

The bushing tap adapter of the present invention includes an adapter frame that can be connected to a bushing tap of power equipment such as a transformer; a protection element built into the adapter frame and grounding the internal circuit of the adapter frame in the event of an overvoltage failure; a field alarm unit for making field workers aware of the operation of the protection element; And it may include a server alarm unit that notifies the operation of the protection element to the server for the bushing diagnosis means.

Description

BUSHING TAP ADAPTER AND BUSHING TAP FLOATING TROUBLESHOOTING SYSTEM}

The present invention relates to a bushing tab adapter and a bushing tab floating failure diagnosis system that constitute a protection device and diagnostic system for preventing bushing tab floating failure.

Figure 1 shows the configuration of a typical transformer bushing, bushing tap adapter, and an online diagnostic system using the same.

The bushing tap is a terminal installed to measure the insulation deterioration of the condenser-type transformer bushing. As the insulation paper and metal sheet intersect, the capacitance formed between the conductor and ground as shown in Figure 1, C1 of the main insulation layer, and the conductor and the outermost It exists to diagnose the insulation condition inside the bushing by measuring the C2 value of the tab insulation layer formed between metal sheets.

In particular, since C2 is designed to be insulated from the ground, which is the enclosure, when the transformer is operated without being grounded, the tap terminal is floating, causing overvoltage stress between the lead terminal and the ground. C2 may deteriorate, and subsequent insulation breakdown may occur.

For the above reasons, when capacitance is not measured in everyday situations, the lead-out terminal is grounded using a metal cover (cap) that is electrically connected to the enclosure ground. When performing bushing online diagnosis in a diagnostic situation, the bushing tab is used. An overvoltage protection element is built into the adapter so that the circuit can be grounded in the event of a failure.

When tab floating insulation breakdown occurs, a localized and continuous arc occurs between the bushing tab withdrawal terminal and the tab adapter, which can cause damage to the tab adapter and deterioration of C2 insulation performance, resulting in transformer insulation breakdown failure.

As the substation comprehensive preventive diagnosis system is expanded, bushing online diagnosis using a bushing tap adapter has been introduced to monitor insulation deterioration and determine condition.

Previously, tab floating failures were prevented by passing a CT sensor for measuring insulation deterioration through the bushing tab pull-out cable, grounding the end, and embedding a protection element such as a varistor inside the bushing tab adapter.

However, for bushing diagnosis, there is no way to recognize poor connection/grounding related to the bushing tap adapter, making it impossible to determine whether floating has occurred due to poor cable connection, poor construction, or physical damage to the internal circuit/protection element.

If long-term operation is continued without the facility operator being aware of this, the leakage current will rapidly increase due to the deterioration of the bushing insulation performance, and as a result, the electrical and thermal stress applied to the protection element may increase, resulting in disconnection or destruction of the element. This can ultimately lead to bushing insulation breakdown.

[Bushing insulation breakdown] at the above tap may cause internal insulating oil to be sprayed into the air, and if insulating oil sprayed in the form of oil vapor comes into contact with a high-temperature arc, it may cause a fire.

For example, if the protection element operates in a floating state that is not grounded because the bushing tap adapter is not properly fastened, the diagnostic device cannot recognize the floating state, and if overvoltage due to a surge or the like occurs in this situation, the protection element itself may be damaged. This can cause great danger.

Therefore, in order to prevent major failure of the transformer, effective bushing tab floating diagnosis and determination technology is required while the bushing tab adapter is fastened.

Republic of Korea Registered Publication No. 10-2324788

The present invention seeks to provide a bushing tab adapter and a bushing tab floating failure diagnosis system that can prevent bushing tab floating in advance.

A bushing tap adapter according to one aspect of the present invention includes an adapter frame that can be connected to a bushing tap of power equipment such as a transformer; a protection element built into the adapter frame and grounding the internal circuit of the adapter frame in the event of an overvoltage failure; a field alarm unit for making field workers aware of the operation of the protection element; And it may include a server alarm unit that notifies the operation of the protection element to the server for the bushing diagnosis means.

Here, the protection element includes: a main protection element that turns on in the event of an overvoltage failure; And it may include a monitoring unit protection element connected in parallel with the main protection element and connected in series with the field alarm unit or the server alarm unit.

Here, a bushing tab connection portion located at one end of the adapter frame and mechanically fastened to the bushing tab; It is located at the other end of the adapter frame and may further include a cable connection portion to which a cable mediating the bushing diagnostic device is connected to enable data communication with an external bushing diagnostic device.

Here, the field alarm unit includes an LED that emits light when the turn-on current of the monitoring unit protection element is conducted; And it may include a snubber resistor that adjusts voltage distribution for the LED.

Here, the server alarm unit may include a relay contact in which the turn-on current of the monitoring unit protection element operates the contact through a winding inside the relay contact to generate a digital contact signal.

Here, it is connected to both ends of the protection element and further includes a DC rectifier circuit that generates DC power in a turn-on state of the protection element, and the field alarm unit can be operated by DC power provided by the DC rectifier circuit. there is.

A bushing tap floating failure diagnosis system according to another aspect of the present invention is connected to a bushing tap of a power facility and includes a protection element that grounds the circuit in the event of an overvoltage failure, and a field alarm unit for making field workers aware of the operation of the protection element. and a bushing tap adapter including a server alarm unit that notifies the operation of the protection element to the following operator server for the bushing diagnosis means; a bushing diagnostic device connected to the bushing tab adapter to measure and diagnose electrical characteristics of the bushing tab; and an operator server that diagnoses the bushing and the power equipment based on electrical characteristic information received from the bushing diagnosis device.

Here, the bushing tap adapter includes an adapter frame that can be connected to a bushing tap of power equipment such as a transformer; a bushing tab connection portion located at one end of the adapter frame and mechanically fastened to the bushing tab; It is located at the other end of the adapter frame and may further include a cable connection portion to which a cable passing through the bushing diagnostic device is connected to enable data communication with an external bushing diagnostic device.

Here, the protection element includes: a main protection element that turns on in the event of an overvoltage failure; and a monitoring unit protection element connected in parallel with the main protection element and connected in series with the field alarm unit or the server alarm unit.

Here, the field alarm unit includes an LED that emits light when the turn-on current of the monitoring unit protection element is conducted; And it may include a snubber resistor that adjusts voltage distribution for the LED.

Here, the server alarm unit may include a relay contact in which the turn-on current of the monitoring unit protection element operates the contact through a winding inside the relay contact to generate a digital contact signal.

Here, it is connected to both ends of the protection element and further includes a DC rectifier circuit that generates DC power in a turn-on state of the protection element, and the field alarm unit can be operated by DC power provided by the DC rectifier circuit. there is.

Implementing the bushing tab adapter and/or bushing tab floating failure diagnosis system according to the spirit of the present invention of the above-described configuration has the advantage of identifying bushing tab deterioration in advance, contributing to prevention of bushing tab insulation breakdown failure and prevention of major transformer failure. there is.

The bushing tab adapter and/or bushing tab floating failure diagnosis system according to the spirit of the present invention prevents tab floating due to poor cable contact, poor construction, circuit damage due to external impact during inspection, disconnection due to element deterioration, etc. There are benefits to doing this.

The bushing tap adapter and/or bushing tap floating failure diagnosis system according to the spirit of the present invention has the advantage of significantly reducing the failure rate of power equipment, especially transformers.

Figure 1 is a circuit diagram showing the configuration of a typical transformer bushing, bushing tap adapter, and an online diagnostic system using the same.
Figure 2 is a block configuration diagram showing the bushing tap adapter according to the spirit of the present invention as functional blocks of an online diagnostic system to which a bushing tap adapter floating diagnostic device is applied.
Figure 3 is a circuit diagram showing a bushing tap adapter according to the spirit of the present invention, focusing on a bushing tap floating diagnostic circuit.
FIG. 4 is a circuit diagram showing an example of implementing the bushing tap adapter of FIG. 3 as a monitoring unit and system configuration using a high-brightness LED and a relay circuit.
FIG. 5 is a circuit diagram showing an example of implementing the bushing tap adapter of FIG. 2 in the form of a bushing tap floating diagnostic device using a DC rectifier circuit.

In describing the present invention, terms such as first and second may be used to describe various components, but the components may not be limited by the terms. Terms are intended only to distinguish one component from another. For example, a first component may be referred to as a second component, and similarly, the second component may be referred to as a first component without departing from the scope of the present invention.

When a component is mentioned as being connected or connected to another component, it can be understood that it may be directly connected to or connected to the other component, but other components may exist in between. .

The terms used herein are only used to describe specific embodiments and are not intended to limit the invention. Singular expressions may include plural expressions, unless the context clearly indicates otherwise.

In this specification, terms such as include or have are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, including one or more other features or numbers, It can be understood that the existence or addition possibility of steps, operations, components, parts, or combinations thereof is not excluded in advance.

Additionally, the shapes and sizes of elements in the drawings may be exaggerated for clearer explanation.

The present invention deals with a protection circuit and device for diagnosing the floating of a bushing tap, and allows the operator to determine whether the tap is abnormal by electrically and visually indicating the protection element that operates during floating.

Figure 2 is a block configuration diagram showing the bushing tap adapter according to the spirit of the present invention as functional blocks of an online diagnosis system to which the bushing tap adapter floating diagnosis device is applied.

As a tab floating diagnostic device according to the spirit of the present invention, the bushing tap adapter is composed of a visual monitoring unit and an electrical monitoring unit as shown in FIG. 2, and as an existing bushing online diagnostic system, the bushing diagnostic device 140 and the operator server 160 By configuring it to be linked, the operator can simultaneously check the bushing online insulation deterioration measurement value and whether the bushing tab is floating.

The bushing tap floating failure diagnosis system shown in FIG. 2 is connected to the bushing 18 tap of the power equipment, and includes a protection element that grounds the circuit in the event of an overvoltage failure, and a field alarm to make field workers aware of the operation of the protection element. A bushing tap adapter 120 having a server alarm unit that notifies the operation of the protection element to the operator server below for the bushing diagnosis means; A bushing diagnostic device 140 connected to the bushing tab adapter to measure and diagnose electrical characteristics of the bushing tab; and an operator server 160 that diagnoses the bushing 18 and the power equipment based on electrical characteristic information received from the bushing diagnosis device 140.

Figure 3 is a circuit diagram showing the bushing tap adapter according to the spirit of the present invention, focusing on the bushing tap floating diagnostic circuit.

The bushing tap adapter 120 as shown in FIGS. 2 and 3 includes an adapter frame that can be connected to the bushing 18 tab of power equipment such as a transformer; a protection element built into the adapter frame and grounding the internal circuit of the adapter frame in the event of an overvoltage failure; a field alarm unit for making field workers aware of the operation of the protection element; And it may include a server alarm unit that notifies the operation of the protection element to the server for the bushing diagnosis means.

Depending on the implementation, the bushing tab adapter 120 includes: a bushing tab connection portion located at one end of the adapter frame and mechanically fastened to the bushing tab; And it may further include a cable connection unit located at the other end of the adapter frame to which a data communication cable, such as a coaxial cable, is connected to the bushing diagnostic device to enable data communication with an external bushing diagnostic device.

In FIG. 3, the protection element includes a main protection element 121 that turns on in the event of an overvoltage failure; and a monitoring unit protection element 122 connected in parallel with the main protection element 121 and connected in series with the field alarm unit or the server alarm unit.

For example, the main protection element 121 and/or the monitoring unit protection element 122 may be implemented as a varistor that is turned on by a predetermined reference potential difference.

The illustrated bushing diagnostic means 140 is connected to the bushing tab adapter 120 and can diagnose the bushing tab by measuring its electrical characteristics.

The main protection element 121 and/or the monitoring unit protection element 122 can protect the circuit of the bushing diagnostic means together with the internal circuit by grounding it in the event of an overvoltage failure.

Figure 3 illustrates the circuit configuration of the bushing tap adapter device proposed according to the spirit of the present invention. Inside the tab 120 of the illustrated bushing tap adapter device, a main protection element 121, which is a conventional overvoltage protector, and a supervisory protection element 122 are configured in parallel, between the supervisory protection element 122 and ground. A visual monitoring unit 124 as the field alarm unit and an electrical monitoring unit 126 as the server alarm unit are connected in series and parallel. In other implementations, each monitor 124, 126 may be individually applicable.

When floating of the tab 18 occurs, the voltage applied to the main protection element 121 and the monitoring unit protection element 122 is the same, and can be configured to operate sequentially or simultaneously depending on the system configuration.

For example, during simultaneous operation, the main protection element 121 suppresses the occurrence of primary overvoltage, and the monitoring unit protection element 122 connects the visual monitoring unit 124 and the electrical monitoring unit 126 to prevent tab floating. It can perform a function to make the user aware that something has occurred.

Depending on implementation, the visual monitoring unit 124 may be replaced with other means such as an audible monitoring unit, or may be configured in a form selected from various means for visual monitoring.

For example, the visual monitoring unit 124 may use a light-emitting diode device capable of visual recognition, such as a high-brightness LED. In this case, when floating occurs, a voltage above a certain level applied to the light-emitting device conducts the device and turns it on, and the operator You can determine whether tab floating has occurred by checking whether it is lit.

The electrical monitoring unit 126 as the server alarm unit may be configured in a form selected from various types of circuit continuity detection and notification means.

For example, the electrical monitoring unit 126 may apply a relay composed of a contact circuit. In this case, when floating occurs, the contact operates and an electrical digital signal is generated, and this is linked to the bushing online diagnosis system to provide notification functions such as an alarm. This makes the operator aware so that he or she can judge tab floating.

FIG. 4 is a circuit diagram showing an example of implementing the bushing tap adapter device of FIG. 3 as a monitoring unit and system configuration using a high-brightness LED and a relay circuit (AC type).

The embodiment shown in FIG. 4 has a form in which the visual monitoring units 124-1 and 125 are equipped with high-brightness LEDs 124-1, and the electrical monitoring unit 126-1 is configured with a relay circuit.

The illustrated visual monitoring units (124-1, 125) are composed of a snubber resistor (125) in series to distribute the voltage of the LED (124-1) and prevent overvoltage applied to the device, and protect the monitoring unit from floating. (122) An on-site alarm can be performed in such a way that the high-brightness LED (124-1) conducts and lights up according to the operation.

The illustrated electrical monitoring unit 126-1 is composed of a relay contact, and when the monitoring unit protection element 122 operates, the current flowing operates the contact through the winding inside the relay contact and generates a digital contact signal. The generated digital signal can be transmitted to the signal processing unit 146 of the diagnostic system to generate an alarm for the server 160.

FIG. 5 is a circuit diagram showing an example of implementing the bushing tap adapter device of FIG. 2 in the form of a bushing tap floating diagnostic device applying a DC rectifier circuit (DC type).

Another embodiment shown in FIG. 5 is a method of forming a structure in which the power of the monitoring unit of the bushing tap adapter 120-2 is applied as DC, and a DC full-wave rectifier circuit 123- is installed on both ends of the main protection element 121-2. 2) is installed so that the visual monitoring unit 124-2 and the electrical monitoring unit 126-2 can operate through DC power.

In the method based only on AC shown in FIG. 4, the visual monitoring unit and the electrical monitoring unit may cause repetitive switching, resulting in repeated blinking. However, in the method shown in FIG. 5, a DC power source capable of full-wave rectification is applied. Accordingly, there is an advantage in that the lighting of the visual monitoring unit and the generation of digital signals in the electrical monitoring unit can be continued.

Meanwhile, in another embodiment of the present invention, a tab floating diagnostic device may be configured by individually applying the visual monitoring unit or the electrical monitoring unit inside the above-described AC type and DC type bushing tap adapters. .

Those skilled in the art to which the present invention pertains should understand that the present invention can be implemented in other specific forms without changing its technical idea or essential features, and that the embodiments described above are illustrative in all respects and not restrictive. Just do it. The scope of the present invention is indicated by the claims described later rather than the detailed description, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention. .

120: bushing tap adapter
121: main protection element
122: Monitoring unit protection element
124: visual surveillance unit
126: Electrical monitoring unit
140: Bushing diagnostic means
160: operator server

Claims (12)

Adapter frames that can be connected to bushing taps in power equipment;
a protection element built into the adapter frame and grounding the internal circuit of the adapter frame in the event of an overvoltage failure;
a field alarm unit for making field workers aware of the operation of the protection element; and
Server alarm unit that notifies the operation of the protection element to the server for the bushing diagnosis means
Bushing tap adapter including.
According to paragraph 1,
The protection element is,
Main protection element that turns on in case of overvoltage failure; and
A monitoring unit protection element connected in parallel with the main protection element and connected in series with the field alarm unit or the server alarm unit.
Bushing tap adapter including.
According to paragraph 1,
a bushing tab connection portion located at one end of the adapter frame and mechanically fastened to the bushing tab;
A (coaxial) cable connection portion located at the other end of the adapter frame and connected to a cable that mediates the bushing diagnostic device to enable data communication with an external bushing diagnostic device.
A bushing tap adapter further comprising:
According to paragraph 2,
The on-site alarm unit,
An LED that emits light when the turn-on current of the monitoring unit protection element is conducted; and
A snubber resistor that adjusts the voltage distribution to the LEDs.
Bushing tap adapter including.
According to paragraph 4,
The server alarm unit,
A relay contact in which the turn-on current of the monitoring unit protection element operates the contact through a winding inside the relay contact to generate a digital contact signal.
Bushing tap adapter including.
According to paragraph 1,
A DC rectifier circuit connected to both ends of the protection element and generating DC power when the protection element is turned on.
It further includes,
The on-site alarm unit,
A bushing tap adapter that operates by DC power provided by the DC rectifier circuit.
A protection element connected to the bushing tap of the power facility and grounding the circuit in the event of an overvoltage failure, a field alarm unit for making field workers aware of the operation of the protection element, and the operation of the protection element for the bushing diagnostic means. A bushing tap adapter having a server alarm unit that notifies the operator server;
a bushing diagnostic device connected to the bushing tab adapter to measure and diagnose electrical characteristics of the bushing tab; and
An operator server that diagnoses the bushing and the power equipment from the electrical characteristic information transmitted from the bushing diagnosis device
Bushing tab floating fault diagnosis system including.
In clause 7,
The bushing tap adapter is,
Adapter frames that can be connected to bushing taps in power equipment such as transformers;
a bushing tab connection portion located at one end of the adapter frame and mechanically fastened to the bushing tab;
A cable connection part located at the other end of the adapter frame and to which a cable mediating the bushing diagnostic device is connected to enable data communication with an external bushing diagnostic device.
A bushing tab floating failure diagnosis system further comprising:
In clause 7,
The protection element is,
Main protection element that turns on in case of overvoltage failure; and
A monitoring unit protection element connected in parallel with the main protection element and connected in series with the field alarm unit or the server alarm unit.
Bushing tab floating fault diagnosis system including.
According to clause 9,
The on-site alarm unit,
An LED that emits light when the turn-on current of the monitoring unit protection element is conducted; and
A snubber resistor that adjusts the voltage distribution to the LEDs.
Bushing tab floating fault diagnosis system including.
According to clause 10,
The server alarm unit,
A relay contact in which the turn-on current of the monitoring unit protection element operates the contact through a winding inside the relay contact to generate a digital contact signal.
Bushing tab floating fault diagnosis system including.
In clause 7,
A DC rectifier circuit connected to both ends of the protection element and generating DC power when the protection element is turned on.
It further includes,
The on-site alarm unit,
A bushing tap floating fault diagnosis system that operates by DC power provided by the DC rectifier circuit. A bushing tap floating fault diagnosis system.