KR102405603B1 - Provide a distribution line lightning prevention system - Google Patents

Abstract

The present invention provides a method for providing a lightning protection system for a power pole of a distribution line, the method comprising: constructing a distribution line; installing means for preventing lightning in the vicinity of the distribution line; and a management recording unit installed around the distribution line to monitor and manage the distribution line and the distribution line periphery, wherein an abnormality is determined in the distribution line by an abnormality determination device, A sensor unit that detects a current value flowing in the distribution line of Provided is a method for providing a lightning protection system for a power pole of a distribution line including a second signal processing unit that outputs different signals according to polarities.

Description

Method of providing a lightning prevention system on a distribution line telegraph pole

The present invention relates to a method for providing a lightning prevention system for a distribution line electric pole, and more particularly, when a distribution line is grounded or short-circuited or a ground fault accident due to lightning occurs, the location of the accident is accurately identified and the size thereof is determined. It relates to a method for providing a lightning protection system for a distribution line pole including an accident location detection device for a distribution line that can be miniaturized to be installed on a ball sensor installed on the line side.

A distribution line is a power line or power cable that supplies power from commercial power sources to buildings, factories, or apartment houses.

As an electric power facility for supplying electric power produced by a power plant to each region through substations for electric power supply, accidents in electric power facilities in modern society are directly linked to long-term power supply interruption and have a significant social impact.

On the other hand, distribution lines installed on the ground are supported by distribution towers installed at regular distances, etc., and since these distribution lines are widely installed over the entire region, they are exposed to risks caused by wind, snow, rain, lightning, and the like.

In addition, most of the accidents of distribution lines are caused by ground faults or short circuits due to unexpected factors, or lightning accidents in which distribution lines are damaged due to direct lightning strikes on distribution towers. Preventive measures such as instantaneous inspections are required to prevent accidents from occurring.

In addition, when the distribution line is short-circuited due to the above-mentioned lightning accident, a large amount of current from several to several tens of times the load current flows through the distribution line, which weakens the tensile strength of the electric equipment such as the voltage booster installed in the distribution tower and causes abnormal operation of the electric equipment. to cause

Therefore, when a ground fault or short circuit accident or lightning accident occurs in a distribution tower, it is necessary to take appropriate measures such as to quickly detect it and stop the electricity supply in the faulty section. .

1 is a view showing an apparatus for detecting an accident section of a conventional overhead distribution line. As shown in the drawing, a plurality of distribution towers 10 are formed to support the distribution line 20 , and a current converter 30 is installed on the distribution line 20 , and the current converter 30 is A transmission device 40 for storing and transmitting the detected current is formed.

The distribution line 20 is composed of an overhead branch line 22 passing through the upper end of the distribution tower 10 and an overhead distribution line 24 passing through the middle upper portion, and the current converter 30 is provided in the overhead branch line 22 is installed

A transmission device 40 is installed to store the current detected by the current converter 30 at a predetermined position of the distribution tower 10 and transmit it to the central control unit 50 .

When a receiving device (not shown) is formed in the transmitting device 40 and an abnormal current is generated, the time is measured and transmitted to the central control unit 50 .

The central control unit 50 measures the ground fault or short-circuited section of the distribution line 20 based on the waveform of the current transmitted from the transmitter 40 and the time measured by the receiver.

Because of the hysteresis characteristic of the iron core, the current converter 30 makes it difficult to detect an accident section when a current larger than the design flows in the overhead branch wire 22, and it is impossible to detect a high-frequency current that occurs instantaneously, such as a lightning strike. There was a problem.

And since the detection device sends a signal when the current generated by an accident is detected, there is a problem in that the section between the two distribution towers in which the detection device is installed has to be inspected.

Republic of Korea Patent Registration No. 10-18110080000

The present invention has been devised to solve the above problems, and a first object of the present invention is to detect a current flowing in a distribution line and accurately measure an accident section and an accident location due to a ground fault or a short circuit accident and a lightning accident. This is to provide a method for providing a lightning protection system for a telegraph pole.

In addition, the present invention applies a Rogowski coil so that it can be installed in the four parts of the ball sensor directly installed on the distribution line, thereby reducing the size of the distribution line and measuring the current of the distribution line inside the ball sensor. It is to provide a method for providing a lightning protection system for a telegraph pole.

In addition, the present invention provides a method for providing a lightning protection system for a distribution line pole in the provision of a lightning protection system for a distribution line telephone pole that can effectively verify and manage the system from the time of preparation for initial provision to the overall installation and operation A method of providing a system will provide

In addition, the present invention is to provide a method for providing a lightning protection system for a distribution line pole that can provide verification and management as evidence after the fact to clarify the cause of the problem and liability for compensation.

In addition, the present invention provides a method for providing a lightning protection system for a distribution line pole that can prevent irreversible errors and damage caused by mass work and mass installation by performing verification and management to enable immediate real-time action. .

In addition, the present invention monitors a number of objects in performing verification and management, and in response to the surrounding climatic environment or operating conditions and pollution exposure situations, the distribution line utility poles capable of fully or partially protective storage and selective control of operation, etc. To provide a method for providing a lightning protection system of

In addition, the present invention is to provide a method for providing a system for preventing a lightning strike of a power distribution pole of a distribution line that is capable of more stable and reliable operation by applying the seismic resistance structure of the monitor means itself and the structure for shock mitigation.

The present invention provides a method for providing a lightning protection system for a power pole of a distribution line, the method comprising: constructing a distribution line; installing means for preventing lightning in the vicinity of the distribution line; and a management recording unit installed around the distribution line to monitor and manage the distribution line and the distribution line periphery, wherein an abnormality is determined in the distribution line by an abnormality determination device, A sensor unit that detects a current value flowing in the distribution line of Provided is a method for providing a lightning protection system for a power pole of a distribution line including a second signal processing unit that outputs different signals according to polarities.

The present invention has one or more of the following effects.

The present invention can provide a method for providing a system for preventing a lightning strike of a power pole of a distribution line that can accurately measure an accident section and an accident location due to a ground fault or a short circuit accident and a lightning accident by detecting a current flowing in the distribution line.

In addition, the present invention applies a Rogowski coil so that it can be installed in the four parts of the ball sensor directly installed on the distribution line, thereby reducing the size of the distribution line and measuring the current of the distribution line inside the ball sensor. It is to provide a method for providing a lightning protection system for a telegraph pole.

In addition, the present invention provides a method for providing a lightning protection system for a distribution line pole in the provision of a lightning protection system for a distribution line telephone pole that can effectively verify and manage the system from the time of preparation for initial provision to the overall installation and operation A method of providing a system can provide

In addition, the present invention is to provide a method for providing a lightning protection system for a distribution line pole that can provide verification and management as evidence after the fact to clarify the cause of the problem and liability for compensation.

In addition, the present invention can provide a method for providing a lightning protection system for a power distribution line pole that can prevent irreversible errors and damage caused by mass work and mass installation by performing verification and management to enable immediate real-time action. have.

In addition, the present invention monitors a number of objects in performing verification and management, and in response to the surrounding climatic environment or operating conditions and pollution exposure situations, the distribution line utility poles capable of fully or partially protective storage and selective control of operation, etc. It is possible to provide a method of providing a lightning protection system of

In addition, the present invention can provide a method for providing a system for preventing a lightning strike of a power distribution pole of a distribution line in which a more stable and reliable operation is possible by applying the earthquake-resistant structure of the monitoring means itself and the structure for shock mitigation.

1 is a view showing an apparatus for detecting an accident section of a distribution line according to the prior art.
2 is a perspective view showing a sensor unit according to the present invention.
3 is a block diagram showing a first signal processing unit according to the present invention.
4 is a block diagram showing a second signal processing unit according to the present invention.
5 to 8 are views showing the main components of the present invention.

Hereinafter, an accident location detection device for a distribution line according to an embodiment of the present invention will be described with reference to the accompanying drawings.

2 is a perspective view showing a sensor unit according to the present invention, FIG. 3 is a block diagram showing a first signal processing unit according to the present invention, and FIG. 4 is a block diagram showing a second signal processing unit according to the present invention.

2 to 4 , the accident location detection device for a distribution line of the present invention includes a sensor unit 100 mounted inside a device such as a ball sensor (not shown) disposed on a line (not shown). be prepared

The sensor unit 100 may be formed of a Rogowski coil.

As shown in FIG. 2, the Rogowski coil includes a body 110 having a certain length, a first fastening part 111 provided at one end of the body 110 and having an outer diameter D of 100 mm, and the A second fastening part 112 is provided at the other end of the body 110 and has an inner diameter d of 80 mm and is fitted and clamped in the first fastening part 111 .

Accordingly, the cross-sectional thickness t1 of the first fastening part 111 and the cross-sectional thickness t2 of the second fastening part 112 may be manufactured to be 10 mm or less.

In addition, the Rogowski coil may be electrically connected to the sensor code 120 .

In addition, the sensor unit 100 may detect current values flowing from a plurality of distribution lines and output them as voltage values.

In addition, the sensor unit 100 is electrically connected to the first signal processing unit 200 . As shown in FIG. 2 , the first signal processing unit 200 may determine whether the line is abnormal through the voltage value output from the sensor unit 100 .

The first signal processing unit 200 includes an integrator 210 that selectively detects a voltage value output from the sensor unit 100, and compares the voltage value detected from the integrator 210 with a preset reference voltage value. , it may be provided with a comparator 220 that determines whether there is an abnormality in the voltage value and outputs different current signals.

Here, the integrator 210 includes a first integrator 211 formed to transform a voltage value detected by a normal phase among the voltage values detected by the sensor unit 100 into a stationary current waveform, and the detection of the sensor unit 100 . The second integrator 212 is formed to transform a voltage value detected by an accident among voltage values into a fault current waveform.

Accordingly, the voltage value detected and output from the sensor unit 100 passes through the preamplifier 201 and is transmitted to the first and second integrators 211 and 212 .

Each of the first and second integrators 211 and 212 selectively detects a voltage value from among the detected voltage values.

Whether or not the detected voltage value is equal to the reference voltage value is discriminated by the comparator 220 .

Therefore, when the voltage value detected by the normal phase is the same as the reference voltage value, since it is a normal current value, the first integrator 211 can transform it into a steady current waveform and output it to the outside.

In addition, if the voltage value detected due to the accident is not the same as the reference voltage value, since it is a fault current value, the second integrator 212 may transform it into a fault current waveform and output it to the outside.

For example, the first and second integrators 211 and 212 may transmit data to an external controller 500 or a display (not shown).

Accordingly, the fault current waveform may be sensed by the controller 500 and the fault current waveform may be visually confirmed by the display.

On the other hand, referring to FIG. 4 , the accident location detection device for a distribution line of the present invention includes a second signal processing unit 300 that outputs different signals according to the polarity of a current flowing in the line, and the first signal processing unit ( 200) and a control unit 500 for receiving an electrical signal from the second signal processing unit 300 and detecting an accident location.

The second signal processing unit 300 includes a surge integrator 310 formed to transform a voltage value detected by lightning among the voltage values detected by the sensor unit 100 into a surge current waveform, and the surge integrator 310 A polarity determiner 320 for outputting different signals according to the polarity of the surge current value is provided.

The polarity determiner 320 includes a first polarity determiner 321 configured to output a 'positive' signal according to the polarity of the current value detected by the surge integrator 310, and the current detected by the surge integrator 310 The second polarity determiner 322 may be configured to output a 'negative' signal according to the polarity of the value.

Accordingly, the voltage value detected and output from the sensor unit 100 passes through the preamplifier 301 and is transmitted to the surge analyzer 310 .

The surge analyzer 310 transmits the detected voltage value to the first polarity discriminator 321 and the second polarity discriminator 322, respectively.

The first polarity discriminator 321 may output a 'positive' signal according to the polarity of the current value detected by the surge integrator 310, and the second polarity discriminator 322 is the surge integrator 310. A 'negative' signal can be output according to the polarity of the detected current value.

Therefore, when a 'negative' signal is output from the signal of the second polarity determiner 322, the output 'negative' signal is transmitted to the controller 500, and the controller 500 determines that the 'negative' signal is The position of the generated line can be detected.

Of course, the control unit 500 may further include a display to visually display the detected position.

5 to 8 , in the method of providing a lightning protection system for a power distribution line pole, the method comprising: constructing a distribution line; installing means for preventing lightning in the vicinity of the distribution line; and a management recording unit installed around the distribution line to monitor and manage the distribution line and the distribution line periphery.

Wherein the distribution line is abnormally determined by an abnormality determining device, the abnormality determining device includes a sensor unit that detects current values flowing from a plurality of distribution lines and outputs a voltage value, and a voltage value output from the sensor unit It includes a first signal processing unit for determining whether or not there is an abnormality in the line, and a second signal processing unit for outputting different signals according to the polarity of the current flowing in the line.

The management and recording unit, a bar-shaped first column module 110' located on one side, a bar-shaped second column module 210' located on the other side, and the first column module 110' A first driving body 115 ′ installed on the It is installed between opposite sides of the body 215' and includes a bar-shaped accommodation module 310' on which a management module for performing photographing is mounted.

The management module includes a first monitoring unit CM1 and a second monitoring unit CM2.

The management recording unit includes a bar-shaped first column module 110 ′ positioned on one side, a bar-shaped second column module 210 ′ positioned on the other side, and the first column module 110 ′. A first driving body 115' installed, a second driving body 215' installed on the second pillar module 210', the first driving body 115' and the second driving body It is installed between opposite sides of the 215' and includes a bar-shaped accommodating module 310' to which the management module is mounted.

Here, the management module includes a first monitoring unit CM1 and a second monitoring unit CM2.

The accommodating module 310', the first monitoring unit CM1 is mounted on one side and the second monitoring unit CM2 is mounted on the other side, and the first driving body 115' and the first It is axially rotated with a set radius between the two driving bodies 215'.

In addition, the management recording unit, the first sub-pillar module 120' installed on the upper part of the first driving body 115', and the second sub-pillar module installed on the upper part of the second driving body 215'. A module 220', a movable panel 320' installed on opposite sides of the first sub-pillar module 120' and the second sub-pillar module 220', and the movable panel 320' It is installed in the central portion of the accommodating module 310' includes an upward movable module 330' for fixing or releasing the fixing.

Here, one side of the movable panel 320', which corresponds to the left side of the upper movable module 330', is provided with a first temperature control unit 331' for controlling the temperature of the management module by spraying a fluid on the lower side. do.

One side of the movable panel 320', which corresponds to the left side of the upper movable module 330', is provided with a second temperature control unit 332' for controlling the temperature of the management module by spraying a fluid thereunder. , the upper movable module 330' is provided with a third temperature control unit 333' for controlling the temperature of the management module by injecting a fluid at the lower portion.

In addition, the first temperature control unit 331 ′ and the second temperature control unit 332 ′ perform cooling or heating to a set temperature through fluid injection to the receiving module 310 ′, but the receiving module It is possible to operate in a first operation mode in which the fluid injection is performed in a general state in which the 310' is not rotated, and a second operation mode in which the fluid injection is performed in a rotational state in which the accommodation module 310' is axially rotated. However, the first monitoring unit CM1 is mounted on the upper side of the accommodation module 310', and the second monitoring unit CM2 is opposite to the first monitoring unit CM1, the accommodation module 310' ), so that the fluid is evenly sprayed to the first monitoring unit CM1 and the second monitoring unit CM2 through the second operation mode.

Here, based on the second operation mode, at least a portion of the first monitoring unit CM1 includes a first area opposite to the first temperature control unit 331 ′, and the second temperature control unit 332 ′. is positioned in a second area opposite to and in a third area opposite to the third temperature control unit 333' to perform the fluid injection, and at least a portion of the second monitoring unit CM2 is at the first temperature Located in a first area facing the control unit 331', a second area facing the second temperature control unit 332', and a third area facing the third temperature control unit 333' and the fluid injection is performed.

On the other hand, the upward movable module 330' protrudes downward to the first mounting body 341' mounted on the upper part of the accommodating module 310' and protrudes downward to the upper part of the accommodating module 310'. A second mounting body 342' to be mounted is provided.

The first mounting body 341' is located on the left side with respect to the third temperature control unit 333' and is mounted on the receiving module 310', and the second mounting body 342' is the second mounting body 342'. 3 It is located on the right side with respect to the temperature control unit 333' and is mounted on the accommodating module 310'.

In addition, the first mounting body 341' and the second mounting body 342' have a first stop mode in which the accommodation module 310' is pressed with a preset first strength to suddenly stop the second operation mode. And, it is possible to operate in the second stop mode in which the accommodation module 310' is pressed with a second strength that is weaker than the first strength to gradually stop the second operation mode.

The first sub-pillar module 120' and the second sub-pillar module 220' move upward and downward from the first driving body 115' and the second driving body 215', respectively. This is possible, and the upward movable module 330 ′ includes the first mounting body 341 ′ and the second mounting body 342 ′ with respect to the receiving module 310 ′ based on the position movement. Reduce or reinforce the degree of pressing.

Here, the upward movable module 330 ′ is provided on the inner surface of the first driving panel 351 ′ provided on the inner surface of the first column module 110 ′ and the second movable module 210 ′. It further includes a second driving panel 352', and a downward moving module 360' provided between the first driving panel 351' and the second driving panel 352'.

An upper side of the lower movable module 360' is provided with a fourth temperature control unit 361' for controlling the temperature of the management module by spraying a fluid upward, and the upper other side of the lower movable module 360' is provided. The side is provided with a fifth temperature control unit 362' for controlling the temperature of the management module by injecting a fluid upward.

The fourth temperature control unit 361 ′ and the fifth temperature control unit 362 ′ perform cooling or heating to a set temperature through the second fluid injection to the accommodating module 310 ′, but the The second fluid injection is performed based on a first operation mode and the second operation mode, and the second operation mode is performed to the first monitoring unit CM1 and the second monitoring unit CM2 through the second operation mode. Make sure the fluid is evenly distributed.

In addition, the fourth temperature control unit 361' is provided at a position opposite to the first mounting body 341', and the fifth temperature control unit 362' is the second mounting body 342'. provided in opposite positions.

The upward movable module 330' is located on the left side of the third mounting body 370' and the third mounting body 370', which protrude upward and are mounted on the upper part of the accommodation module 310'. The fourth mounting body 371' and the third mounting body 370' protruding to and mounted on the upper part of the accommodating module 310' are located on the right side, and protruding upward to the accommodating module 310'. and a fifth mounting body 372' mounted thereon.

Based on the second operation mode, at least another part of the first monitoring unit CM1 includes a fourth area opposite to the fourth temperature control unit 361', and the fifth temperature control unit 362'. It is located in a fifth area opposite to and the fluid is sprayed, and at least another part of the second monitoring unit CM2 has a fourth area facing the fourth temperature control unit 361' and the fifth area. It is located in a fifth area opposite to the temperature control unit 362 ′ to perform the fluid injection.

Here, the fourth mounting body 371 ′ and the fifth mounting body 372 ′ press the accommodating module 310 ′ with a preset third strength to suddenly stop the second operation mode in a third stop mode. And, it is possible to operate in the fourth stop mode in which the accommodation module 310' is pressed with a fourth strength that is weaker than the third strength to gradually stop the second operation mode.

The first driving panel 351 ′ and the second driving panel 352 ′ are provided to be movable in a second position up and down from the first starting module and the second starting module, and the downward movable module ( 360'), the third mounting body 370', the fourth mounting body 371', and the fifth mounting body 372' with respect to the accommodating module 310' based on the second positional movement. ) to be reduced or reinforced.

The management recording unit is mounted on the lower portion of the first pillar module 110', a first fixing module 410' for fixing the position of the first pillar module 110', and the second pillar module 210 ') and further includes a second fixing module 510' for fixing the position of the second pillar module 210'.

The first pillar module 110 ′ is provided with a first extension portion 1101 ′ with a reduced outer circumferential surface at its lower end, and the first fixing module 410 ′ has a lower first body panel 411 ′. and a first press-in module 412' provided on both upper sides of the first body panel 411', and a first sub-press-fit module 413 provided on both upper sides of the first press-fit module 412', respectively. ') is included.

Here, the first body panel 411' is mounted on the first extension 1101', and the first press-in module 412' is press-fitted around the first extension 1101' to fix it. , the first sub press-fitting module 413' is fixed by press-fitting the periphery of the first column module 110'.

On the other hand, the second pillar module 210' is provided with a second extension part 2101' with a reduced outer circumferential surface at the lower end portion, and the second fixing module 510' has a lower second body panel 511' ), a second press-in module 512' provided on both upper sides of the second body panel 511', and a second sub-press-fit module provided on both upper sides of the second press-in module 512', respectively ( 513'), the second body panel 511' has the second extension part 2101' mounted thereon, and the second press-in module 512' is a part of the second extension part 2101'. The periphery is press-fitted and fixed, and the second sub press-in module 513' is press-fitted and fixed to the periphery of the second column module 210'.

The first sub press-in module 413' and the second sub press-in module 513' are press-fitted based on circumferential rotation in the first press-in module 412' and the second press-in module 512', respectively. However, the first sub press-in module 413' and the second sub press-in module 513' rotate in the circumferential direction in the first press-in module 412' and the second press-in module 512', respectively. Together with the first column module and the second column module 210' toward the circumferential direction rotation and proximity movement is added to perform press-fitting.

Here, a first extension bar 4131' is provided on the upper portion of the first press-in module 412', and a first fixing flange 4132' installed on the upper end of the first extension bar 4131' is provided,

A second extension bar 5131' is provided on an upper portion of the second press-in module 512', and a second fixing flange 5132' installed on the upper end of the second extension bar 5131' is provided, and the The first fixing flange 4132' is inserted and mounted on the outside of the first pillar module 110', and the first extension bar 4131' descends in the state in which the first pillar module 110' is inserted and mounted. , the second fixing flange 5132' is inserted and mounted on the outside of the second pillar module 210', and the second extension bar 5131' is inserted in the state in which the second pillar module 210' is inserted and mounted. descend

In addition, based on the descent of the first extension bar 4131 ′ and the second extension bar 5131 ′, the first fixing flange 4132 ′ and the second fixing flange 5132 ′ are the first pillar modules. (110') and the second pillar module (210') is pulled downward to give a fixing force.

The management recording unit is covered with a storage body 610' having an internal accommodation space, and the storage body 610' is seated on the first fixing flange 4132' and the second fixing flange 5132'. , the storage body 610' seals the management recording unit so that the fluid is internally filled in accordance with the injection of the fluid to the management module and the injection of the second fluid.

The driving method of the physical components described above is based on a motor, an actuator, etc., and the forward and backward movement and rotational movement are made, and the shape and size of each component can be variously selected and provided according to the installation site and materials to be implemented. .

Although the present invention has been described with reference to the embodiment shown in the drawings, which is only exemplary, those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom.

Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

100: sensor unit 110: body
111: first fastening part 112: second fastening part
200: first signal processing unit 210: integrator
220: comparator 300: second signal processing unit

Claims (2)

In the method of providing a lightning protection system for a distribution line telegraph pole,
A step of installing a means for preventing lightning in the vicinity of the distribution line; and
Comprising the step of installing a management recording unit around the distribution line to monitor and manage the distribution line and the distribution line periphery,
The management recording unit,
A bar-shaped first column module 110 ′ positioned on one side, a bar-shaped second column module 210 ′ positioned on the other side, and a first drive installed on the first column module 110 ′ A body 115', a second driving body 215' installed on the second pillar module 210', and the first driving body 115' and the second driving body 215' It is installed between opposite sides and includes a bar-shaped accommodation module 310 ′ on which a management module for performing photography is mounted,
The management module includes a first monitoring unit (CM1) and a second monitoring unit (CM2),
The management module
It includes a first monitoring unit (CM1) and a second monitoring unit (CM2),
The accommodating module 310' is
The first monitoring unit CM1 is mounted on one side and the second monitoring unit CM2 is mounted on the other side, and the set radius is set between the first driving body 115 ′ and the second driving body 215 ′. is rotated
The management recording unit is
The first sub-pillar module 120' installed on the upper part of the first driving body 115', the second sub-pillar module 220' installed on the upper part of the second driving body 215', and the first The movable panel 320' installed on opposite sides of the sub-pillar module 120' and the second sub-pillar module 220', and the accommodating module 310' installed in the center of the movable panel 320'. Includes an upward movable module 330' for fixing or releasing the fixing,
One side of the movable panel 320' corresponding to the left side of the upper movable module 330' is provided with a first temperature control unit 331' for controlling the temperature of the management module by injecting a fluid into the lower portion,
One side of the movable panel 320' corresponding to the left side of the upper movable module 330' is provided with a second temperature control unit 332' for controlling the temperature of the management module by spraying a fluid on the lower side,
The method of providing a lightning protection system for a power distribution line pole in which the upper movable module 330' is provided with a third temperature control unit 333' for controlling the temperature of the management module by spraying a fluid at the lower portion.
delete

Images