KR20120019994A - Auto reel type bypass conductors system for lightning courrent discharge on floating roof type flammable storage tanks - Google Patents

Abstract

PURPOSE: A bypass conductor device for discharging a lightning current of a floating roof type oil storage tank is provided to minimize impedance due to a lightning current in a winder by adopting the winder without a slip ring. CONSTITUTION: A non slip ring auto winder(1) is fixed to an inner wall(6) of the upper side of a tank with a bolt and a nut(5). A connection terminal(9) of one end of a bypass conductor(7) is connected to a floating roof rim(8) through a connection cable(19). The connection terminal is connected to the floating roof rim with a bolt and a nut(10). A cable rotation guide shaft(20) and a cable guide roller(2) rotate to wind the cable. A floating roof(15) moves downwardly to release the cable. An inner end of the bypass conductor wound around a cable drum(3) is directly fixed to a winder body.

Description

AUTO REEL TYPE BYPASS CONDUCTORS SYSTEM FOR LIGHTNING COURRENT DISCHARGE ON FLOATING ROOF TYPE FLAMMABLE STORAGE TANKS}

The present invention relates to a bypass conductor device for discharging dead current in a floating loop type oil storage tank, and more particularly, a cable attached to a spring slip ring automatic winding machine. The flexible cable is attached to the drum to fix the winder body to the top of the tank inner wall and the other side to the floating roof to maintain proper tension as long as the cable length corresponding to the floating roof position. By connecting the tank shell and the floating loop electrically perfectly with the minimum impedance, it is possible to quickly and safely discharge the lightning current through the grounding facility of the tank body. A pass conductor device.

Here, the bypass conductor uses a bare wire braided cable so that the length of the cable wound around the windinger is excluded from the cable impedance calculation element so that the minimum current impedance is always maintained to maximize the brain current flow. In particular, by adopting a winding machine that directly connects the cable wound on the spool and the tank body without using the slip ring, it essentially eliminates the cause of arcing during the energization of the brain. Do not ignite by arc.

In general, technical standards to prevent fire and explosion accidents caused by lightning strikes in the External Floating Roof Tank (EFRT) for storing flammables (oil, liquefied gas, etc.) [NFPA 780 2011 Edition and API RP 545 First Edition. [October 2009] mandatory installation of bypass conductors.

According to the above standard, an external floating roof tank (EFRT) for storing flammable substances is equalized within 30 m along the tank inner wall cylinder to prevent fire and explosion due to lightning strikes around the main body or tank. Bypass conductors are installed at intervals to provide a circuit for safe discharge of brain current through the tank body and floating loops.

In the revised API RP 545 Technical Committee, the components of the brain currents caused by the negative thundercloud are represented by Component A-First Return Stroke, Component B-Intermediate Current, Component C-Continuous Light Current (Current) and Component D-Subsequent Return Strokes, etc., and the factors that cause arcing in the shunt are caused by Component B and Component C. [2008] UK Culham Electromagnetics and Lightning Ltd, at the request of API. of Oxfordshire.

Therefore, to component A which does not cause arcing in shunt,

Amends and supplements the regulations to ensure that the brain currents corresponding to components B and C, which discharge the corresponding brain currents and cause arcing in the shunt, are connected to the tank's grounding system through the bypass conductor and discharged quickly and safely. will be.

In the case of metal oil storage tanks, when a strong thundercloud develops at the top of the tank,

The charge is induced in the sieve and the stored oil, which is charged. The metal tank outer wall and the inner oil storage have different charging and discharging characteristics. No discharge during

The Bound Charge phenomenon occurs, which causes a considerable amount of charge in the floating loop that is directly connected to the oil, and the metal tank body is discharged to generate a potential difference between the two parts. Shunt (shunt) metal conductor sliding around the periphery of the full-roofing loop for electrical connection between tank bodies

To maintain a continuous electrical connection between the tank outer wall and the floating loop.

Device) to secure the static discharge passage and the floating loop and tank body

The related standard has been prescribed so as to eliminate the potential difference between and.

The technical committees such as API and NFPA have analyzed the cause of frequent fires in oil storage tanks caused by lightning strikes.In the event of lightning strikes in the oil storage tanks or the surrounding area, arcs due to connection resistance are generated in this shunt. (Shunt) It has been found that a fire occurs due to the ignition of the surrounding vapor.

Therefore, the relevant standard specification [NFPA 780 2011 edition and API RP 545 2009. October 2009] revised or supplemented the following three contents.

First, as a matter of shunt, conventionally, shunt is installed on the upper part of the loop sealing device, but when arc is generated in the connection part of the shunt and the tank body due to brain current, the phenomenon of ignition of vapor is caused. As a result, the revised regulation [NFPA 780 2011 edition, 7.4.1.2.1 Shunt Placement, 4.2.1.1 Shunt for Conduction, Page 3] Submerged Type). Submerged Classifier

Shunt) is installed every 3m along the periphery of the cylinder inside the tank at least 30 Cm below the floating loop to suppress arcing caused by brain current and to generate arcing in the oxygen-blocked storage to eliminate the cause of ignition. It was.

Second, parts such as measuring gauges or guide poles installed through the floating loops are electrically insulated from the floating loops (insulation level 1KV or more) to prevent lightning discharges [NFPA 780 2011 edition, 7.4.1.5 Insulation of Gauge or Guide Poles, Page 780-28 / API RP 545 4.2.3 Insulation of Gauge or Guide Poles, Page 4] To solve the problem, the provision of bypass conductors to ensure a safe discharge path for lightning current between the floating loop and the tank body [NFPA 780 2011 edition, 7.4.1.3 Bypass Conductor, Page 780-28 / API RP] 545 4.2.1.2 Bypass conductors. The technical background is to comply with these relevant regulations to prevent fire and explosion accidents caused by lightning strikes in oil storage tanks.

The present invention is to solve the above problems, the first problem to be solved is to minimize the impedance of the bypass conductor system (bypass conductor system).

This bypass conductor device consists of an automatic winding and a bypass conductor. One of the main factors affecting the impedance of the bypass conductor device is the electrical connection device of the bypass conductor and the winding machine. Is the bypass conductor. First, as an impedance-related matter inside the automatic winding machine, in general, the automatic winding machine implements an electrical connection between a conductor wound on a rotating drum and the outside by a slip ring. Slip ring is a structure in which electrical connection is made by sliding between two metals (or similar conductors) for electrical connection between a rotating part and a fixed part, and a connection resistance is generated between two connection points.

This connection resistance is not fixed and is variable and gradually increases due to deterioration, wear, corrosion, electrical and mechanical shocks, and the like. In particular, in view of the purpose of the bypass conductor used as the discharge path of the brain current, the impedance of the slip ring itself is greatly increased when a transient voltage and current such as the brain current flow. Since the impedance increase of the bypass conductor in such a transient state becomes a critical factor for the rapid and safe discharge of the brain current, the present invention intends to solve this problem by adopting an automatic winding machine without an electrical connection point such as a slip ring. The following is the impedance of the bypass conductor, and as a means of supplementing the problem of the conventional shunt, the general cable is fixed to the tank wall at one end and the other end, such as the electrostatic dispersion bonding cable used by some users. When used in connection with the floating loop, as shown in FIG. 2, the cable corresponding to the length of the tank or more than the depth of the tank is always separated by its own weight regardless of the floating loop position.

In this case, the data shows that the brain current frequency (f) is very high, such as 20 MHz, and the impedance rapidly increases when the brain current flows through the bypass conductor. As an example, if you compare the impedance of a normal connection using a 50 sqmm cable to a 15 m deep oil storage tank and the same cable to an automatic winder (normally without lightning current), the floating loop is 12 m deep from the top of the tank. If present, the impedance of an automatic windinger is 26 times smaller than that of a conventional fixed cable.

As described above, an increase in the internal impedance of the automatic winding machine and the impedance of the bypass conductor during the brain current discharge causes problems in the rapid and safe brain current discharge.

Second, we will try to solve the problems caused by arcing in the automatic winding machine for the bypass conductor.

When adopting an automatic winding machine that electrically connects the floating loop and the tank main body by slip ring, there is a problem that does not comply with the regulations in the same way as the exposed shunt, which is a method of electrically connecting the floating loop and the tank main body. In other words, when components B and C of the brain current flow through the exposed seal shunt, arc is generated and there is a risk of a fire in the tank. Therefore, it is replaced with a submerged shunt. The specification has been amended to remove shunts.

Slip ring is a structure in which electrical connection is made by sliding between two metals (or similar conductors) for electrical connection between the rotating part and the fixed part, and there is a connection point having the same structure as the shunt. Such slip ring deteriorates the electrical connection state due to deterioration when used for a long time as described above, so that a strong arc is generated when the brain current discharges through the slip ring of the winder.

In FIG. 3, the location where the automatic winder is installed, as illustrated (API / American Petroleum Institute, RP 500, page 19), is also designated Hazardous Class I, Division 1 in the hazardous area classification in the same way as the area where the exposed shunt is installed. Therefore, when the electric current is discharged through the bypass conductor, if a strong arc is generated at the slip ring connection inside the winder, the same problem occurs as the exposed type shunt which is to be removed by the revised regulation. In order to solve this problem, the present invention is to solve the problem that the arc occurs in the slip ring by adopting an automatic winding machine that can directly connect the tank body and the floating loop without a slip ring (Non Slip Ring).

Third, to eliminate the electrical discharge phenomenon of the bypass conductor and to extend the life through the arrangement. First, as shown in FIG. 4, when the flow rate is increased and the floating loop is located at the upper side, the cables are irregularly stacked on the upper surface of the loop and are entangled with each other. If arcing occurs between the connected cables and between the cable and the upper surface of the floating metal body, there is a risk that a fire may be caused by oil vapor present in the upper part of the roof.

Next, the cable installed every 30 m around the tank is loosely stretched by its own weight. It is shaken by strong wind, causing fatigue on the cable fixing part, which may cause disconnection, and when the floating loop moves to the upper position. There is a risk that the cables will be entangled with each other on top of the loop and twisted together and the loop will not loosen when it is moved downward. Furthermore, access to the upper part of the roof for maintenance makes it difficult to secure a working space, which is a problem in securing safety.

In order to solve the above problems that occur when using a conventional cable medallion.

Fourth, when using an automatic winder or similar device equipped with a slip ring, these winders are installed at the top of the inner wall of the oil storage tank where the vapor density is as low as possible for the arc generated from the slip ring in the winder during the discharge of the brain current. Should be.

At this time, the weight of the bypass conductor cable (approximately 11kg if the 50 sqmm copper cable is stretched 25m from the top of the tank) acts as the load of the winder spring. In order to solve this problem, it is necessary to increase the tension of the spring, which increases the volume and load of the winder, thereby increasing the cost of the device.

It is intended to solve this problem by using a contactless winder without slip ring to prevent arcing caused by lightning current and to install the position of the winder on the bottom of the floating loop and to fix one end of the cable to the top of the tank inner wall.

Finally, when the cable of non-pass conductor is used as an insulated wire, the self weight of the cable increases due to the insulation coating, and if the winding and unwinding are repeated while exposed to the outside, the insulation state cannot be maintained due to deterioration of the insulation coating. Vibration is severely affected by the wind, causing problems such as shortening of the connection fixing part. Even when stranded wire is used, mechanical strength may be reduced by oxidation of copper wire, and disconnection due to external impact may occur.

In order to achieve the above object, a bypass conductor device for discharge current of a floating loop type oil storage tank according to the present invention has the following characteristics.

1. Minimizing Impedance of Automatic Winding Machine

Minimize the impedance of the winding machine itself by adopting the connectionless automatic winding machine without slip ring. As described in the problem to be solved above, the slip ring increases contact resistance due to deterioration due to long-term use, and in particular, the impedance of the slip ring itself becomes excessive when transient voltages and currents such as brain current flow. It will increase greatly. In the present invention, since the impedance increase of the bypass conductor becomes a critical factor in the rapid and safe discharge of the brain current, which is the main purpose of the bypass conductor, in the present invention, a cable for the bypass conductor is used without an electrical connection point such as a slip ring. One end is fixed by welding directly to the winder main body, and the winding machine having the structure that can mechanically fix and electrically bond the winder main body to the outer wall of the tank is applied to minimize the impedance in the winder.

2. Impedance Minimization of Bypass Conductor

It adopts a contactless automatic winding machine without slip ring to minimize the electrical impedance by slip ring which is a connection device of general winding machine. When a normal cable is used as a bypass conductor, there will always be a line impedance corresponding to a fixed length above the tank depth regardless of the position of the floating loop moving up and down according to the oil storage volume of the oil storage tank. On the other hand, when the automatic winding is adopted, the bypass conductor is automatically wound and automatically released depending on the position of the floating loop.

In this way it is possible to keep the length of the cable unrolled outside the winder to a minimum. If the bypass conductor cable is used with bare braided tin copper cable, the cables wound on the winding machine drum are electrically connected to each other in the drum. Since it corresponds to the calculation of the line impedance, the bypass conductor can always keep the impedance due to the high frequency of the brain current to the minimum value.

3. How to eliminate the cause of slip ring arc caused by the brain current in the winder

It is possible to prevent tank fire by preventing ignition of oil vapor by preventing arc generation due to brain current at the slip ring connection point without slip ring. When adopting an automatic winding machine that electrically connects the floating loop to the tank body by slip ring, the arc of the slip ring contact increases rapidly when the brain current passes through the slip ring. This phenomenon is similar to the case where components B and C of the brain current flow through the exposed seal shunt as shown in FIG. 1, and the arc in the Hazardous Class I, Division 1 of FIG. This will cause a fire in the oil storage tank. One side of the bypass conductor cable is connected to the floating loop, the other end is directly welded to the winder body, and the winder body is mechanically and mechanically fixed to the tank body so that the floating loop and the tank body are not connected, such as slip rings. This problem is solved by adopting the winding machine which can connect the electric perfectly.

4. Solve the electrical spark phenomenon and arrangement problem that occur when using ordinary cable

The spring tension of the automatic winding machine keeps the bypass conductor cable in the proper tension to prevent shaking, entanglement, disconnection, and spark between connected cables. When using a general cable as the bypass conductor cable, as shown in FIG. 2, it should be repeatedly unrolled and rolled up irregularly stacked on the bottom of the floating roof at the top of the inner wall of the storage tank body. In order to eliminate the mechanical damage or electrical arc caused by this, an automatic winding machine was used to maintain the bypass conductor in an orderly manner as shown in FIG. 4.

5. Solve the limitation of the location of automatic winding machine installation

The automatic take-up installation location was installed at the bottom of the floating roof to eliminate the cable load. By eliminating the cause of arcing caused by the slip ring of the automatic winding machine, the mounting position of the automatic winding machine can be installed on the upper floor of the floating loop to reduce the load of the automatic winding machine due to the weight of the bypass conductor. In addition to smooth winding and unwinding operation, the mechanical specifications of the winder were also reduced to promote economics.

6. By adopting a bypass conductor or bare braided tin copper cable, it is possible to increase the flexibility of the cable, to increase the corrosion resistance, to increase the conductivity and, in particular, to connect the conductive path by interconnecting in the winding drum. The impedance of the entire cable is minimized.

7. Easy explosion proof structure

The place where this winder is installed corresponds to the Hazardous Area Class I, Division 1 of FIG. 3 where oil vapor and flammable gas are present. Since there is no electrical connection point, it can have explosion-proof structure easily with only mechanical parts. In order to eliminate the cause of sparks caused by friction between metals, electrical insulation is made of material with small friction coefficient at cable outlet and cable guide roller part. .

8. Adopt weatherproof enclosure

In order to allow outdoor installation, it has a material and structure that can withstand rain, wind, dust and snow.

According to the bypass conductor device for discharge current fall of the floating loop type oil storage tank according to the present invention has the following effects.

1. The impedance of the winding machine for bypass conductor can be minimized. That is, by adopting a winder without slip ring, it is possible to minimize the impedance caused by the brain current inside the winder, thereby maximizing the main purpose of the bypass conductor.

2. By applying automatic winding, shorten the length of the bare wire braided cable connecting the oil storage tank main body and the floating loop to minimize the impedance of the cable.

3. By adopting bare wire braided tin-plated cable made by twisting twisted conductor cable by twisting the bare conductor wire to improve the electrical and mechanical characteristics.

Effect.

4. By adopting spring type automatic winding machine, it is easy to repair and maintain by eliminating the cause of shaking, tangling, disconnection, extension of life and electrical spark during use.

5. Easy to implement explosion-proof automatic winding machine

The place where this winder is installed is classified as Hazardous Area Class I, Division 1 where oil and flammable gas exist. Therefore, it should be explosion-proof structure. It is very easy to manufacture the body of explosion-proof structure by eliminating the electrical connection part. It is effective to increase.

6. Adopt weatherproof enclosure

It has economical effect by extending the life of winder by having material and structure that can endure rain, wind, dust, snow, etc. to enable outdoor installation.

7. Securing flexibility of installation position of automatic winding machine

By adopting a winding machine with no connection point and explosion-proof structure, there is no risk of arcing when thunder current flows, and there is no restriction on the installation location, so it can be installed on the bottom of the floating loop instead of the top of the tank wall, reducing the load of the bypass conductor cable. This can reduce the load on the winder spring.

Other objects and advantages of the present invention in addition to the above object will be apparent from the detailed description of the embodiments with reference to the accompanying drawings.

1 is a graph showing the characteristics of brain current (Cambridge University Press. Ravok and Uman, Rightnung Physics Effects P. 363 Quoted by API RP 545).
2 is a view showing a situation when using a general cable of the bypass conductor.
FIG. 3 shows the Classification fo Locations for electrical Installations at Petroleum Facilities Classified by API RP 500, P. 19. FIG.
4 is a view showing a situation in use of a bypass conductor device according to the present invention;
5 is a view showing a bypass conductor device for discharge current fall of a floating loop type oil storage tank according to the present invention.
FIG. 6 is a view showing a situation in which a bypass conductor device for discharge current discharge of a floating loop type oil storage tank according to the present invention is used. FIG.
7 and 8 are a perspective view and a cross-sectional view for explaining in detail the bypass conductor device for the fall current discharge of the floating loop type oil storage tank according to the present invention.

Hereinafter, with reference to the accompanying Figures 4 to 8 will be described in detail the bypass conductor device for the fall current discharge of the floating loop type oil storage tank according to the present invention.

As shown in Figs. 4 to 8, the bypass conductor device for discharge current leakage of the floating loop type oil storage tank according to the present invention, the non-silp ring automatic winding machine (1) inside the tank upper end Fixing by bolts and nuts (5) on the wall (6) and connecting the connection terminal (9) at one end of the bypass conductor (7) to the floating loop rim (8) via the connection-only connection cable (19). By using (10), the fatigue phenomenon caused by connecting the bypass conductor 7 directly to the floating roof rim 8 is reduced and the mechanical strength is improved.

Instead of fixing the cable drum 3 as an example of a non-contact winding machine, the cable rotation guide shaft 20 and the cable guide roller 2 are rotated by spring tension so that the cable is wound, and the unwinding is a floating loop ( When 15) moves down, loosening is done by downward weight.

In this way, since the rotation of the cable drum 3 does not rotate, the inner end of the bypass conductor 7 wound around the cable drum 3 can be fixed directly to the winder main body, thereby bypassing the bypass conductor. (7) and the electrical bonding between the winding machine main body (1) is formed to enable the structure of a contactless automatic winding machine, but in the present invention, a connectionless automatic winding machine having such a structure is adopted.

Depending on the storage of flammable deposits, the floating loop 15 is used for sealing the classifier 16 and the vapor sealer 17 and oil vapor by means of a shoe (13) of the scissors assembly 18 along the tank inner cylindrical wall 6. The fabric 12 moves up and down.

When the storage volume of the flammable material storage tank increases, the floating loop 15 moves upward. The bypass conductor 7 is automatically wound by the tension of the spring 4 mounted on the automatic winding machine 1. .

On the contrary, when the storage amount of the flammable storage tank is reduced, the floating loop 15 moves downward, and the bypass conductor 7 is released by the load of the protruding loop 15.

At this time, the bypass conductor 7 is wound and unwound on the cable drum 3 by the cable guide roller 2 of the automatic winding machine 1 through the bypass conductor inlet and outlet 11 of the automatic winding machine 1. This is made and maintained in a loose state by the spring (4) tension of the automatic take-up (1). The bypass conductor (7) is a cable drum (3) of the automatic winding machine (1) using a circular flexible tin-plated bare copper wire 0.18 / 214/7 (a cable made of tin-plated bare wire and twisted again). The cable for bypass conductor (7) wound on the cable drum (3), which is easily wound and unwound at the same time, is bypassed only by cables that are laminated inside the drum, electrically connected to each other, and unwound outside the winder (1). Since it becomes the impedance element of the conductor 7, it is possible to ensure the minimum impedance according to the position of the floating loop 15 to have a more sure brain current path.

In this way, the total resistance of the bypass conductor specified by NFPA 780 2011 and API RP 545 can be kept well below 0.03 ohm.

By-pass conductor devices having these characteristics are installed at equal intervals of less than 30 m along the circumference of the tank to be connected to the tank ground point G, thus preventing fire and explosion of the flammable material storage tank due to lightning strike. . Furthermore, the cable guide roller 2 and the cable entry / exit 11 having friction between metals are electrically insulated from a polyethylene-based resin material having a small coefficient of friction, thereby eliminating the risk of sparks caused by friction.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Of course.

1: automatic winding machine 2: cable guide roller
3: cable drum 4: spring
5: Bolt & Nut 6: Tank Inner Wall
7: bypass conductor 8: floating roof rim
9: connection terminal 10: bolt & nut
11: entrance and exit 12: oil vapor sealing fabric
13: shoe 14, 15: floating loop
16: shunt (classifier) 17: oil vapor sealing device
18 Caesars assembly 19: connection cable
20: cable rotation guide shaft

Claims (12)

The bypass conductor windinger, which connects the floating loop of the oil storage tank and the tank body electrically to secure a safe path for discharge of the brain current, adopts a slip-free connection-free winding machine to minimize the impedance caused by the brain current inside the winder. Thus, the floating loop type oil storage tank of the floating loop type oil storage tank can be stably discharged by securing a minimum impedance brain current discharge path in the floating loop of the oil storage tank and the ground system connected to the tank body. Bypass conductor device for dead current discharge. The method of claim 1,
In order to realize a contactless winder without slip ring, connect one end of the bypass conductor to the winder body by welding and connect the winder body to the oil storage tank inner wall with welding or bolts and nuts. A bypass conductor device for discharge current leakage in a floating loop type oil storage tank, characterized in that it has a winder structure without slip ring by directly connecting between bodies by a bypass conductor cable. The method of claim 1,
The bypass conductor cable is automatically wound and automatically released according to the position of the floating loop by the spring tension of the automatic winding machine, thereby minimizing the length of the cable between the automatic winding machine and the floating loop and reducing the cable for the bypass conductor. Floating loop type oil storage tank characterized in that the cable wound on the winding machine drum by twisted pair is electrically connected by mutual contact to minimize the length of the connecting cable between the tank body and the floating loop, thereby minimizing the impedance of the cable when thunder current passes. Bypass Conductor Device for Discharging Current in the Brain. 3. The method according to claim 1 or 2,
In order to maintain the minimum impedance between the floating loop and the tank body and the grounding system of the tank body, the winding machine's connection to the tank body is fixed by welding and a number of bolts and nuts to ensure sufficient mechanical and electrical connection. Bypass conductor device for discharge current fall of the floating loop type oil storage tank characterized in that the electrical coating is applied to increase the conductivity and to prevent corrosion. 3. The method according to claim 1 or 2,
When connecting one end of the bypass conductor cable to the floating loop, do not connect the cable end terminal directly to the loop structure, but fasten it with bolts and nuts using two dedicated connecting cables with connecting terminal blocks. Bypass conductor device for dead current discharge in a floating loop type oil storage tank, characterized by a secure electrical connection. The method of claim 3,
By adopting 0.18 / 214/7 round stranded braided tin-plated cable, twisted by twisting the bypass conductor cable with tinned stranded wire, to increase the conductivity and provide the flexibility necessary for corrosion protection, winding and unwinding. A bypass conductor device for discharge current leakage in a floating loop oil storage tank. The method of claim 1,
Impedance in the bypass conductor path, i.e. through the floating loop and bypass conductor and the tank body, is kept below 5 Ohm max and the overall resistance of the bypass conductor is kept at 0.01 Ohm at 25m length. Bypass conductor device for falling current discharge in floating loop type oil storage tank. The method of claim 1,
Floating loop characterized by easy to extend the life of the bypass conductor by solving the problem of shaking, tangling, disconnection, etc. by using the spring type automatic winding machine, the cable is kept loose by the spring tension. Bypass conductor device for discharge of dead current in a type oil storage tank. The method of claim 1,
If the cable is kept loose by the spring tension because the bypass conductor is irregularly entangled at the bottom of the protruding loop, if the brain current is passed, sparks may occur between the contacted cables. A bypass conductor device for discharge current leakage in a floating loop type oil storage tank, characterized in that the cause is eliminated. The method of claim 1,
The application of the contactless winder without slip ring eliminates the electrical connection parts, and it is possible to implement the explosion-proof current discharge of the floating loop type oil storage tank, which is easy to realize the explosion-proof structure by insulating the winding machine cable entrance and exit and the cable guide roller with resin. Bypass conductor device. The method of claim 1,
It adopts weatherproof type enclosure and uses material such as SUS 316 that can withstand rain, wind, dust, snow, etc. to enable outdoor installation, and it has all-weather structure to extend the life of winder. Bypass conductor device for discharge current leakage in floating loop type oil storage tank. The method of claim 1,
By adopting a winding machine with no connection point and explosion-proof structure, it is possible to eliminate the risk of arc generated during energization of the brain, eliminating the restriction on the position of the winding machine, so that the automatic winding machine can be installed on the bottom of the floating loop. A bypass conductor device for discharge current leakage in a floating loop type oil storage tank, characterized in that the load of the pass conductor cable is reduced to reduce the load of the winder spring.

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