KR100855743B1 - A safety Apparatus for indicating running state of transformer - Google Patents

Abstract

The present invention relates to an operation state display and a safety device of a transformer, in a transformer in which a voltage is increased by induction between a primary coil and a secondary coil embedded in an enclosure, the transformer is mounted on the front of the enclosure, An operation state display unit provided with a voltage display unit and a load display unit; A current transformer connected to a lead drawn from the inside of the secondary coil; It is connected to the primary coil to flash the energization lamp when power is applied to the primary coil and de-applied.It is connected to detect the voltage of the primary and secondary coils and display them on the voltage display unit. A microcomputer provided to calculate a current load current and a load rate of the displayed current and display the load on the load display unit; By including a primary coil, secondary coil, and a microcomputer protection part interposed between the current transformer and the microcomputer, the operation status indicator is provided on the front of the enclosure to identify the operation state of the transformer at once, and overheat, overload or phase loss It is possible to prevent damage to the transformer and the electrical and electronic equipment connected to the transformer by forcibly cutting off the alarm and alarming the alarm to realize rapid maintenance of the transformer and forcibly shutting off the power applied to the transformer after a set time. There is.

Transformer, display, safety, alarm

Description

Safety device for indicating running state of transformer

1 is a perspective view showing a transformer according to the prior art.

2 is a perspective view showing a transformer having a movable state display unit according to the present invention.

3 is a configuration diagram showing an operation state display and a safety device according to the present invention.

<< Explanation of symbols for main part of drawing >>

150: operation state display unit

151: energized lamp

152a, 152b: voltage display unit

153a, 153b: load display unit

154a, 154b: temperature display

155: load alarm lamp

156: phase alarm lamp

160: oil filling part

172, 174: coil

184: thermocouple                 

190: power cut off

210: current transformer (CT)

220: MICOM

230: Speaker

250: micom protection unit

The present invention relates to an indication of the operating state of a transformer and a safety device.

In particular, the present invention relates to an operation state display and a safety device capable of implementing stable operation of the transformer by providing an operation state display unit on the front of the enclosure so that the operation state of the transformer can be easily identified.

In addition, the present invention relates to an operation state display and a safety device that can prevent damage to the transformer and electrical and electronic devices connected to the transformer during abnormal operation of the transformer.

A transformer is a device that converts a voltage to the required value. The conversion of voltage here means the conversion of current at the same time. In some cases, a transformer is used to obtain the required value of current, but in most cases, the purpose is conversion of voltage.

Electricity is divided into alternating current and direct current, but transformers are for alternating current only and do not use direct current. Alternating current is used in most of the power system, and direct current is used only in a part of electric railway, because a transformer is used for alternating current. There is a limit to the power that can be transported on a transmission line, and the limit is proportional to the square of the transmission voltage and inversely proportional to the transmission distance.

In recent power systems, large power plants tend to be far from demand, requiring large power lines to be transported on long transmission lines. Therefore, the power transmission voltage is gradually increasing. However, transformers are used in factories and homes because these high voltages are not suitable and must be converted to low voltages.

The transformer generates heat due to Joule loss due to the resistance of the winding during operation, hysteresis loss due to the alternating flux in the iron core, and eddy current loss occurring in the iron core or the case. Because it causes deterioration, a heat sink is required. Transformers are mostly oil-filled with iron cores and windings enclosed in an enclosure. Therefore, the heat generated during operation of the transformer is transmitted to the oil, and the heated oil causes convection. In self cooling, the surface area of the transformer enclosure is increased, and a corrugated iron plate or a radiator is attached to increase the cooling effect. The wind-cooled fan sends the wind to the radiator with a fan, and the water-cooled fan installs a water-cooling tube in oil to cool the water through the cooling water. In oil feeding, the heated oil is pumped out and cooled by natural cooling, wind cooling or water cooling.

Therefore, in such an inflow transformer, the temperature of oil changes according to a change in load or a change in ambient temperature. Therefore, the volume of oil also changes, so if there is an open part in the tank, air enters. This is called respiratory action. When there is respiratory action, the outside moisture is inhaled and oxygen in the air reacts with the oil to produce insoluble sludge, which lowers the dielectric strength and cooling action of the oil, causing failure. Therefore, various oil deterioration prevention devices are put into practical use. An open type is a method of removing moisture from inhaled air by placing a dehydrating agent in the breathing apparatus. The sealed type seals and seals nitrogen on the upper part of the conservator. Therefore, the pressure of nitrogen changes as the oil temperature changes. The diaphragm type is a soft oil resistant rubber membrane inside the conservator that blocks oil from contact with the outside air.

Inflow transformers are also highly reliable devices with a long history of use, but are equipped with safety tubes on the top of the tank in case of breakdown failure. This means that if an oil breakdown occurs due to an arc in the tank and the hydraulic pressure is abnormally high, oil is released from the safety pipe before the tank is destroyed to lower the oil pressure. Since the oil released from the safety tube may be hot, some of the oil may be led to underground tanks so as not to damage other objects such as ignition by contact with air.

As shown in FIG. 1, the inflow transformer has a plurality of bushings 12 and a terminal 14 mounted on an upper portion of a metal enclosure 10, for example, a steel, and a heat sink 20 is provided to dissipate oil. It is provided on the front and back.

The hydraulic transformer is provided with a flow meter 30 and an oil thermometer 40 on the upper side of the hydraulic transformer.

Therefore, in the conventional inflow transformer, since the heat sink 20 is provided on the front side and the rear side, the flow meter 30 and the oil thermometer 40 are mounted on the upper side of the enclosure 10 so that identification by the user can be achieved. In addition, in the case of a pad-mounted type in which a power component is packaged, it is not easy to identify the column transformer.

In addition, the transformer according to the prior art has a disadvantage in that safety accidents may occur frequently during actual use in the field because it is necessary to check a separate instrumentation panel specially provided in order to grasp voltage and current.

In addition, the transformer according to the prior art is always exposed to an electric shock because it is confirmed by listening to the sound of the transformer to check the state of energization, and there is a possibility that a safety accident occurs because the alarm for overload is not considered at all. There is a very high problem. Another way to check the state of energization can check the substation room or power distribution panel, but this is not immediately known the state of electricity in the field, as well as the method by the instrument is a hassle that requires measurement equipment.

An object of the present invention created to solve the above problems is to provide an operating state display and a safety device of the transformer that can easily identify in the field all the information related to the operating state of the transformer.

Another object of the present invention is to provide an operation state display and a safety device of a transformer that can prevent a safety accident in advance.

An object of the present invention, in a transformer in which the voltage is increased by induction between the primary coil and the secondary coil built into the enclosure, is mounted on the front of the enclosure, the energization lamp, the voltage display unit, the load display unit An operation state display unit provided; A current transformer connected to a lead drawn from the inside of the secondary coil; It is connected to the primary coil to blink the energization lamp when the power is applied to the primary coil and de-applied, it is connected to detect the voltage of the primary and secondary coils respectively and display the voltage display unit, A microcomputer provided to calculate and display a current load current and a load ratio detected from the current transformer; It can be achieved by the operation state display and the safety device of the transformer, characterized in that it comprises a micom protection unit interposed between the primary coil, the secondary coil and the current transformer and the micom.

Preferably, the apparatus further includes a thermocouple connected to the microcomputer in the oil filling part of the transformer of the present invention.

More preferably, the operation state display unit of the present invention further includes a temperature display unit, wherein the temperature display unit receives the temperature detected from the thermocouple from the microcomputer to display the temperature of the oil.

Preferably, the micom protection unit of the present invention includes a decompression unit for reducing the high pressure applied from the primary and secondary coil to low pressure, a rectifying unit for converting alternating current into direct current, and attenuating unit for reducing noise.

Preferably, the operation state display unit of the present invention further comprises a load alarm lamp, the load alarm lamp is turned on when the load rate is greater than the reference load rate received from the microcomputer receives the load rate input from the current transformer.                         

Preferably, the operation state display unit of the present invention further includes an imaging alarm lamp, wherein the imaging alarm lamp receives the presence or absence of the imaging phase of the primary coil from the microcomputer and turns on when an imaging occurs.

More preferably, further comprising a speaker connected to the micom of the present invention, wherein the speaker is turned on when the temperature of the oil detected from the thermocouple is over the reference oil temperature, the load alarm lamp or the phase alarm lamp The alarm sound is output by the micom.

More preferably, further comprising a power interrupter interposed between the AC power supply and the primary coil of the present invention, wherein the power interrupter comprises: a temperature of oil detected from the thermocouple, a load rate detected from the current transformer, and the The AC power applied to the primary coil is cut off after a predetermined time has elapsed when the primary coil is provided with or without the primary coil from the microcomputer in an overheated state above a reference oil temperature, an overloaded state above a reference load factor, or an open phase.

Hereinafter, the configuration of the present invention with reference to the drawings in detail.

Figure 2 is a perspective view showing a transformer with a movable state display unit according to the present invention, Figure 3 is a block diagram showing a movable state display and a safety device according to the present invention.

2 and 3, a transformer having a movable state display and a safety device according to the present invention includes a plurality of bushings 112 and terminals 114 mounted on an upper portion of a metal enclosure such as steel enclosure 110. And heat dissipation plate 120 is provided on the front and rear for heat dissipation of oil. And the operation state display part 150 by this invention is provided in the front surface of an enclosure. Here, the operation state display unit 150 according to the present invention is a power supply lamp 151, voltage display unit 152a (152b), load display unit 153a (153b), temperature display unit 154a (154b), load alarm lamp ( 155, an imaging alarm lamp 156 is provided.

The transformer has a primary coil 172 and a secondary coil 174 located inside the oil filling unit 160 filled with oil. Here, the transformer is a power interrupter 190 is interposed between the AC power and the primary coil 172, the power interrupter 190 is provided in the enclosure or inside of the transformer.

The primary coil 172 is connected to the microcomputer 220 to indicate the energized state when the AC voltage is applied to the lead drawn from the coil, the microcomputer 220 is in operation in response to the application and release of the alternating voltage The energization lamp 151 of the display unit 150 blinks.

In the primary coil 172 and the secondary coil 174, the microcomputer 220 is connected to the leads drawn from the coils so as to detect the initial applied voltage and the output voltage, respectively. Initially applied voltages and output voltages are displayed on the voltage display units 152a and 154b that are digitally processed and provided to the operation state display unit 150.

A current transformer (CT) 210 is interposed between the lead drawn from the coil of the secondary coil 174 and the microcomputer 220, and the load current A and the load rate (%) are determined by the current transformer 210. It is detected and digitally processed by the microcomputer 220 so that the load current A and the load percentage% are displayed on the load display units 153a and 153b of the operation state display unit 150.

The load ratio of the first load display unit 153a is divided into "0 to 40%", "41 to 80%", "80% to", and the like, and the microcomputer 220 corresponds to the load rate to each lamp (not shown). It is configured to blink by applying or de-energizing power. In addition, in the second load display unit 153B, the load current A and the load rate% are digitally processed by the microcomputer 220 and displayed.

The first voltage display unit 152a is an alternating voltage applied to the primary coil 172, and the second voltage display unit 152b is an output voltage of the secondary coil 174 derived from the primary coil 172 as a microcomputer ( The voltage is digitized by 220 and the corresponding voltages are displayed.

The transformer is provided with a thermocouple 184 in the oil filling unit 160. Here, the thermocouple 184 is connected to the microcomputer 220 to detect the temperature of the oil, each temperature is displayed on the temperature display unit 154a (154b) provided to the operation state display unit 150 by the microcomputer 220 do.

The temperature of the oil is divided into “0 to 75 ° C.” and “75 ° C.” to the first temperature display unit 154a, and the microcomputer 220 supplies power to lamps (not shown) provided at corresponding portions. Or de-authorize and blink. In addition, the second temperature display unit 154b displays the current temperature of the oil by digitizing the microcomputer 220. Here, the "upper limit temperature" means the maximum temperature rise limit of oil corresponding to the insulation class of each transformer.

The load alarm lamp 155 of the operation state display unit 150 is configured to be powered on by the microcomputer 220 when the load ratio detected from the current transformer 210 described above is equal to or greater than the reference load ratio.

In addition, the imaging alarm lamp 156 of the operation state display unit 150 is configured such that the imaging information is input by the microcomputer 220 connected to the primary coil 172 so that power is applied when the imaging occurs.

In addition, the present invention provides a speaker 230 controlled by the microcomputer 220 to alert the transformer manager and an outsider of a dangerous state of the transformer when the load alarm lamp 155 or the phase alarm lamp 156 is turned on. have. In addition, when the temperature of the oil detected by the thermocouple 184 is overheated above the reference oil temperature, the speaker 230 outputs an alarm sound by the microcomputer 220 as described above.

When the load alarm lamp 155 and the imaging alarm lamp 156 are turned on and the temperature of the oil detected by the thermocouple 184 is overheated above the reference oil temperature, the preset time is elapsed. A power cut-off unit 190 is provided between the AC power source and the primary coil 172 to cut off the AC power source in order to prevent damage to the connected electric and electronic devices. The power cut-off unit 190 is configured to automatically short-circuit the AC power and the primary coil 172 when the preset time elapses as described above by the microcomputer 220.

In addition, the transformer of the present invention is a microcomputer protection unit 250 between the respective leads of the coils 172 and 174, the thermocouple 184, the current transformer 210, the secondary coil 174 and the microcomputer 220 connected to each other. ) Is intervened. Here, the microcomputer protection unit 250 is a pressure reducing unit for reducing the voltage to protect the microcomputer 220 from the ultra-high voltage applied from the primary coil 172, a rectifying unit for converting AC to direct current, and attenuating unit for reducing noise. Consists of.

The embodiment of the present invention described above has been described as being limited to a three-phase inrush transformer, but the present invention is not limited thereto, and it can be easily carried out by those skilled in the art. It is apparent that modifications belong to the technical spirit of the present invention.

Looking at an example that can be modified from an embodiment of the present invention.

1. Apply 3-phase transformer-> Apply single phase transformer

2. Ingress transformer application-> Dry or mold transformer application

Thermocouple is installed adjacent to the secondary coil to measure the temperature of the secondary coil

3. Load rate (%) display-> Rated current (A) display

4. Check energization from primary coil-> Check energization from primary or secondary coil

5. Check for missing phase of primary coil-> Check for missing phase of primary or secondary coil

The present invention having the above configuration has the following advantages and effects.

First, the present invention has the advantage that the operating state display is provided on the front of the enclosure, even if the columnar or packaged to identify the operating state at once.

Secondly, the present invention has the effect of realizing the rapid maintenance of the transformer by the alarm and alarm at the same time by the corresponding lamp and the speaker at the time of overheating, overloading or phase loss.

Third, the present invention has the advantage of preventing damage to the transformer and the electrical and electronic devices connected to the transformer by forcibly shutting off the power applied to the transformer when a predetermined time elapses after the warning and alarm proceed.

Claims (8)

In a transformer in which the voltage is increased by induction between the primary coil and the secondary coil embedded in the enclosure, An operation state display unit mounted on a front surface of the enclosure and provided with an energization lamp, a voltage display unit, and a load display unit; A current transformer connected to a lead drawn from the inside of the secondary coil; It is connected to the primary coil to blink the energization lamp when the power is applied to the primary coil and de-applied, it is connected to detect the voltage of the primary and secondary coils respectively and display the voltage display unit, A microcomputer provided to calculate and display a current load current and a load ratio detected from the current transformer; And a micom protection unit interposed between the primary coil, the secondary coil, and the current transformer and the microcomputer. The method of claim 1, And a thermocouple connected to the micom inside the oil filling part of the transformer. The method of claim 2, The operation state display unit further includes a temperature display unit, And the temperature display unit displays the temperature of the oil by receiving the temperature detected from the thermocouple from the microcomputer. The method of claim 1, The microcomputer protection unit includes a decompression unit for reducing the high pressure applied from the primary and secondary coils to a low pressure, a rectifying unit for converting alternating current into direct current, and an attenuating unit for reducing noise. Safety device with marking. The method of claim 1, The operation state display unit further includes a load alarm lamp, The load alarm lamp is a safety device having an operation state display of the transformer, characterized in that when the load ratio is received from the microcomputer receives the load ratio input from the current transformer is more than the reference load ratio. The method of claim 1, The operation state display unit further includes an imaging alarm lamp, The phase alarm lamp is provided with the presence or absence of phase loss of the primary coil from the microcomputer and the safety device having an operation state display of the transformer, characterized in that the lighting is generated. delete delete

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