CN210898620U - Power transmission line monitoring device independent optical storage power supply system with windproof characteristic - Google Patents
Power transmission line monitoring device independent optical storage power supply system with windproof characteristic Download PDFInfo
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- CN210898620U CN210898620U CN201921643830.0U CN201921643830U CN210898620U CN 210898620 U CN210898620 U CN 210898620U CN 201921643830 U CN201921643830 U CN 201921643830U CN 210898620 U CN210898620 U CN 210898620U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The utility model discloses a transmission line monitoring devices independent light storage power supply system with prevent wind characteristic, including shaft tower, battery, the shaft tower includes four angle bars, each connect through the link between the angle bar, the angle bar is right angle form, each angle bar surface all is equipped with two photovoltaic module, totally eight photovoltaic module, be first photovoltaic module, second photovoltaic module, third photovoltaic module, fourth photovoltaic module, fifth photovoltaic module, sixth photovoltaic module, seventh photovoltaic module, eighth photovoltaic module respectively; and each photovoltaic module supplies power to the storage battery and the detection device through a charge-discharge management circuit. The utility model discloses change the solar cell panel of traditional mode built on stilts installation into hugging closely shaft tower angle steel surface mounting, can be less than strong wind weather, greatly reduced wind-force cause the possibility of destroying to equipment or shaft tower structure.
Description
Technical Field
The utility model relates to a transmission line monitoring devices independent light stores up power supply system with prevent wind characteristic.
Background
Monitoring devices such as video monitoring devices for ensuring the safety of the power transmission line, various sensors for micrometeorological observation, communication devices and the like are often installed on the power transmission line tower, and the power supply problem of the monitoring devices usually adopts a mode of 'solar cell panel + storage battery'; because the solar cell panel is generally in a plane plate shape, the solar cell panel can bear larger wind power in windy weather or windy areas, so that the solar cell panel not only can damage the device, but also can endanger the safety of a tower structure.
The application number is CN201710448419.7 discloses a wind power tower self-power-consumption power supply system and a power supply method, the power supply system comprises a solar cell panel, a photovoltaic lightning protection combiner box, a controller, an inverter, a power illumination box and a storage battery, the power supply method is that the solar cell panel converts solar energy into electric energy, the electric energy is converged by the photovoltaic lightning protection combiner box and then is output to the controller, the output of the controller is direct current of target voltage, on one hand, the direct current is stored in the storage battery and supplied to a direct current load, on the other hand, the output is output to the inverter and converted into alternating current, and the alternating current load is supplied. However, when the illumination is insufficient, the output voltage of the entire photovoltaic power supply may not meet the power supply voltage requirement of the load, and the system cannot adjust the power supply mode for each load according to the output voltage of the photovoltaic power supply.
SUMMERY OF THE UTILITY MODEL
The utility model aims at prior art not enough, provide the independent light storage power supply system of transmission line monitoring devices who has the characteristic of preventing wind, not only can be applicable to the many wind areas, but also designed the high-efficient management control strategy of electric energy, ensured the stable high-efficient operation of system.
In order to achieve the above object, the utility model discloses a following scheme realizes: the independent light storage and power supply system of the power transmission line monitoring device with the windproof characteristic comprises a pole tower and a storage battery, wherein the pole tower comprises four angle irons, the angle irons are connected through a connecting frame, the angle irons are right-angled, two photovoltaic modules are arranged on the surface of each angle iron, and the total number of the photovoltaic modules is eight, namely a first photovoltaic module, a second photovoltaic module, a third photovoltaic module, a fourth photovoltaic module, a fifth photovoltaic module, a sixth photovoltaic module, a seventh photovoltaic module and an eighth photovoltaic module; and each photovoltaic module supplies power to the storage battery and the detection device through a charge-discharge management circuit.
The photovoltaic module comprises a first photovoltaic module, a second photovoltaic module, a fourth photovoltaic module, a sixth photovoltaic module, a seventh photovoltaic module and four parallel modules, wherein the first photovoltaic module is connected with the eighth photovoltaic module in parallel, the second photovoltaic module is connected with the third photovoltaic module in parallel, the fourth photovoltaic module is connected with the fifth photovoltaic module in parallel, the sixth photovoltaic module is connected with the seventh photovoltaic module in parallel, and the four parallel modules formed after the parallel connection are sequentially connected in series end to end.
The system also comprises a photovoltaic module access and removal control unit, wherein the photovoltaic module access and removal control unit comprises a voltage comparator, an N-channel MOSFET and a P-channel MOSFET;
the positive electrode of a power supply of the eighth photovoltaic module is respectively electrically connected with the drain electrode of the switch tube S1, the source electrode of the switch tube S1 is electrically connected with the drain electrode of the switch tube S5 and the positive input end of the voltage comparator D1, and the negative electrode of the power supply output end of the eighth photovoltaic module is respectively electrically connected with the grid electrode of the switch tube S1, the grid electrode of the switch tube S5 and the output end of the voltage comparator D1;
the positive electrode of the power output end of the third photovoltaic module is respectively electrically connected with the drain electrode of the switch tube 2, the source electrode of the switch tube S2 is electrically connected with the drain electrode of the switch tube S6 and the positive input end of the voltage comparator D2, and the negative electrode of the power output end of the third photovoltaic module is respectively electrically connected with the grid electrode of the switch tube S2, the grid electrode of the switch tube S6 and the output end of the voltage comparator D2;
the positive electrode of a power supply of the fifth photovoltaic module is respectively electrically connected with the drain electrode of the switch tube S3, the source electrode of the switch tube S3 is electrically connected with the drain electrode of the switch tube S7 and the positive input end of the voltage comparator D3, and the negative electrode of the power supply of the fifth photovoltaic module is respectively electrically connected with the grid electrode of the switch tube S3, the grid electrode of the switch tube S7 and the output end of the voltage comparator D3;
the positive electrode of the power supply of the seventh photovoltaic module is respectively electrically connected with the drain electrode of the switching tube S4, the source electrode of the switching tube S4 is electrically connected with the drain electrode of the switching tube S8 and the positive input end of the voltage comparator D4, and the negative electrode of the power supply of the seventh photovoltaic module is respectively electrically connected with the grid electrode of the switching tube S4, the grid electrode of the switching tube S8 and the output end of the voltage comparator D4.
The drain of the switch tube S5 is respectively and electrically connected with the drain of the switch tube S9, the source of the switch tube S10 and the inverting input end of the hysteresis comparator D5;
the drain of the switch tube S10, the source of the switch tube S11, and the diode DAKAnode is electrically connected, diode DAKThe cathode is respectively and electrically connected with the drain of the switch tube S12, the positive input end of the voltage comparator D6, one end of the capacitor C and one end of the load R, and the gate of the switch tube S12 is electrically connected with the output end of the voltage comparator D6;
the source electrode of the switch tube S9 and the source electrode of the switch tube S12 are respectively and electrically connected with the input end of the charging management circuit, and the output end of the charging management circuit is electrically connected with the power supply input end of the storage battery;
the output end of the storage battery power supply is electrically connected with the input end of the discharge management circuit, and the output end of the discharge management circuit is electrically connected with the drain electrode of the switch tube S11;
the other end of the capacitor C and the other end of the load R are electrically connected with the cathode of the output end of the discharge management circuit, and the source electrode of the switch tube S8 is electrically connected with the cathode of the input end of the charge management circuit.
The utility model has the advantages that: 1. the solar cell panel which is installed in an overhead mode in a traditional mode is changed to be installed close to the surface of the tower angle steel, so that the weather can be lower than the weather of strong wind, and the possibility of damage of wind power to equipment or a tower structure is greatly reduced;
2. according to the different lighting environments of the tower in all angles, the 8 photovoltaic modules are reasonably connected in series and in parallel, so that the power output capacity of the photovoltaic cell panel is improved;
3. the design of the photovoltaic module access and removal control unit can not only adapt to the actual characteristic that the tower cannot be used for different angle lighting, but also remove the shaded photovoltaic module in time, thereby avoiding hot spot effect;
4. the design and utilization of the hysteresis comparator can not only intelligently screen out the photovoltaic power supply voltage meeting the power supply requirement of the load, but also avoid the too frequent switching action due to the action of the upper threshold and the lower threshold of the hysteresis comparator; on the other hand, when the hysteresis comparator judges that the output voltage of the photovoltaic power supply does not meet the power supply requirement of the load, the electric energy of the photovoltaic power supply is not wasted, but the storage battery is charged, so that the waste of the electric energy is greatly reduced;
5. when the illumination is too sufficient, namely the output voltage of the photovoltaic power supply is too high, the comparator D6 acts to enable redundant electric energy to charge the storage battery; in the process, the comparator D is actually used for replacing the traditional voltage reduction and voltage stabilization circuit, so that the electric energy loss is reduced, and the electric energy utilization rate is improved;
6. in the circuit according to the present patent, the load has two supply paths and the battery also has two charging paths.
Drawings
The invention will be further explained with reference to the drawings:
FIG. 1 is a block diagram of the present invention;
FIG. 2 is a control circuit diagram of the present invention;
in the figure: the photovoltaic system comprises a first photovoltaic module 1, a second photovoltaic module 2, a third photovoltaic module 3, a fourth photovoltaic module 4, a fifth photovoltaic module 5, a sixth photovoltaic module 6, a seventh photovoltaic module 7, an eighth photovoltaic module 8, a tower 9, a storage battery 10, a detection device 11 and a photovoltaic module access and removal control unit 12.
Detailed Description
As shown in fig. 1, the independent optical storage and power supply system of the power transmission line monitoring device with the windproof characteristic comprises a tower 9 and a storage battery 10, wherein the tower 9 comprises four angle irons, the angle irons are connected through a connecting frame, the angle irons are right-angled, two photovoltaic modules are arranged on the surface of each angle iron, and eight photovoltaic modules are eight in total and are respectively a first photovoltaic module 1, a second photovoltaic module 2, a third photovoltaic module 3, a fourth photovoltaic module 4, a fifth photovoltaic module 5, a sixth photovoltaic module 6, a seventh photovoltaic module 7 and an eighth photovoltaic module 8; each photovoltaic module supplies power to the storage battery 10 and the detection device 11 through a charge-discharge management circuit.
As shown in fig. 2, the first photovoltaic module 1 is connected in parallel with the eighth photovoltaic module 8, the second photovoltaic module 2 is connected in parallel with the third photovoltaic module 3, the fourth photovoltaic module 4 is connected in parallel with the fifth photovoltaic module 5, the sixth photovoltaic module 6 is connected in parallel with the seventh photovoltaic module 7, and four parallel modules formed after parallel connection are sequentially connected in series end to end. Because the angle irons are right-angled, the photovoltaic modules on two surfaces of each angle iron are subjected to different illumination and different generated voltages, so that two photovoltaic modules on the same angle iron are intelligently connected in series for use; two photovoltaic modules in 4 photovoltaic modules on adjacent angle bars are positioned on the same plane, the received illumination and the generated voltage are equal, and the photovoltaic modules can be used in parallel in order to improve the voltage grade. The anodes of the first and eighth photovoltaic modules 1 and 8 serve as the total output positive electrode and the cathodes of the photovoltaic modules 6 and 7 serve as the total output negative electrode.
The system further comprises a photovoltaic module access and cut-off control unit 12, wherein the photovoltaic module access and cut-off control unit 12 comprises a voltage comparator, an N-channel MOSFET and a P-channel MOSFET; in the problem of illumination angle in practical use, at least two directions in 4 directions of the tower are backlight surfaces in different areas and different moments, which causes no voltage output of the parallel photovoltaic modules in the directions; because the photovoltaic module can generate a hot spot effect when no voltage is output to influence the whole power output capacity, the photovoltaic module is cut off by the cut-off control unit.
The positive electrode of the power supply of the eighth photovoltaic module 8 is electrically connected to the drain electrode of the switching tube S1, the source electrode of the switching tube S1 is electrically connected to the drain electrode of the switching tube S5 and the positive input end of the voltage comparator D1, and the negative electrode of the power supply output end of the eighth photovoltaic module 8 is electrically connected to the gate electrode of the switching tube S1, the gate electrode of the switching tube S5 and the output end of the voltage comparator D1;
the positive electrode of the power output end of the third photovoltaic module 3 is respectively electrically connected with the drain electrode of the switching tube 2, the source electrode of the switching tube S2 is electrically connected with the drain electrode of the switching tube S6 and the positive input end of the voltage comparator D2, and the negative electrode of the power supply of the third photovoltaic module 3 is respectively electrically connected with the grid electrode of the switching tube S2, the grid electrode of the switching tube S6 and the output end of the voltage comparator D2;
the positive electrode of the power supply of the fifth photovoltaic module 5 is electrically connected with the drain electrode of the switching tube S3, the source electrode of the switching tube S3 is electrically connected with the drain electrode of the switching tube S7 and the positive input end of the voltage comparator D3, and the negative electrode of the power supply of the fifth photovoltaic module 5 is electrically connected with the gate electrode of the switching tube S3, the gate electrode of the switching tube S7 and the output end of the voltage comparator D3;
the positive electrode of the power supply of the seventh photovoltaic module 7 is electrically connected to the drain electrode of the switching tube S4, the source electrode of the switching tube S4 is electrically connected to the drain electrode of the switching tube S8 and the positive input end of the voltage comparator D4, and the negative electrode of the power supply of the seventh photovoltaic module 7 is electrically connected to the gate electrode of the switching tube S4, the gate electrode of the switching tube S8 and the output end of the voltage comparator D4.
The drain of the switch tube S5 is respectively and electrically connected with the drain of the switch tube S9, the source of the switch tube S10 and the inverting input end of the hysteresis comparator D5;
the drain of the switch tube S10 is electrically connected to the source of the switch tube S11 and the anode of the diode DAK, the cathode of the diode DAK is electrically connected to the drain of the switch tube S12, the positive input end of the voltage comparator D6, one end of the capacitor C and one end of the load R, and the gate of the switch tube S12 is electrically connected to the output end of the voltage comparator D6;
the source electrode of the switch tube S9 and the source electrode of the switch tube S12 are respectively and electrically connected with the input end of the charging management circuit, and the output end of the charging management circuit is electrically connected with the power supply input end of the storage battery;
the output end of the storage battery power supply is electrically connected with the input end of the discharge management circuit, and the output end of the discharge management circuit is electrically connected with the drain electrode of the switch tube S11;
the other end of the capacitor C and the other end of the load R are electrically connected with the cathode of the output end of the discharge management circuit, and the source electrode of the switch tube S8 is electrically connected with the cathode of the input end of the charge management circuit.
Example 1:
the photovoltaic module access and cut-off control unit 12 composed of D1, S1 and S5 can realize access and cut-off control of the parallel photovoltaic modules 1 and 8. The circuit working principle is explained in detail: when the output voltage of the photovoltaic module is lower than UT, the photovoltaic module is considered to have no voltage output, so the UT is used as a voltage reference for controlling the connection and disconnection of the photovoltaic modules 1 and 8; inputting the sampled real-time output voltages of the photovoltaic modules 1 and 8 to a non-inverting input end of a voltage comparator D1, and outputting a high level or a low level after the voltage is compared with UT; when the actual voltage is greater than UT, the output of D1 is high level, S1 is triggered to be conducted, and meanwhile, the bypass switch tube S5 is triggered to be turned off, so that the photovoltaic modules 1 and 8 are connected; on the contrary, when the actual voltage is less than UT, the output of D1 is low, S1 is triggered to turn off, and the bypass switch tube S5 is triggered to turn on, which realizes the cutting of the photovoltaic modules 1 and 8.
Example 2:
when the illumination is insufficient, the output voltage of the whole photovoltaic power supply may not meet the requirement of the load power supply voltage, but the photovoltaic power supply can charge the storage battery through the charging management module at the moment, and the load is supplied with power by the storage battery through the discharging management module; on the other hand, the load power supply voltage is allowed to fluctuate within a small range, and in order to avoid the load power supply from frequently switching between the photovoltaic power supply and the storage battery, the hysteresis comparator D5 is designed in the circuit. The working principle is explained in detail:
inputting the sampled real-time output voltage of the photovoltaic power supply to an inverting input end of a hysteresis comparator D5, and setting the output high and low levels of the hysteresis comparator as VOHAnd VOLThen, the voltages at the non-inverting input terminal, i.e., the upper and lower threshold voltages of the hysteresis comparator D5, are:
VTH＝Vref·R2/(R1+R2)+VOH·R1/(R1+R2)
VTL＝Vref·R2/(R1+R2)+VOL·R1/(R1+R2)
setting the standard voltage of load power supply as UNThen may be slightly below UNUpper and lower threshold voltages are set nearby so that: vTH＝aUN,VTH＝aUNAnd a is a<b<1, and thus designing parameters of the hysteresis comparator D5; the hysteresis comparator will act to cause the load to intelligently select two different power supply paths.
A first power supply path: when the actual output voltage of the photovoltaic power supply is less than aUNWhen the photovoltaic power supply voltage is too small, the photovoltaic power supply voltage does not meet the load power supply requirement; if the output of the D5 is high level, the switching tube S10 is triggered to turn off, and the photovoltaic power supply is stopped to supply power to the load; the switching tube S9 is triggered to be conducted, so that the photovoltaic power supply which does not meet the power supply requirement of the load charges the storage battery; meanwhile, the switch tube S11 is triggered to conduct, and the battery 10 is used to supply power to the load; and until the photovoltaic power supply voltage rises to equal bUNSo far, this supply path will be kept unchanged;
a second power supply path: when the actual output voltage of the photovoltaic power supply is greater than bUNWhen the photovoltaic power supply voltage meets the load power supply requirement, the photovoltaic power supply voltage meets the load power supply requirement; if the output of the D5 is low level, the switching tube S10 is triggered to conduct, so that the photovoltaic power supply supplies power to the load; the switching tube S9 is triggered to turn off, so that the photovoltaic power supply stops charging the storage battery 10 and preferentially supplies power to the load; at the same time, the switch tube S11 is triggered to turn off, so that the storage battery 10 is stoppedStopping supplying power to the load; and until the photovoltaic power supply voltage drops to equal aUNThis supply path will remain unchanged until now.
Example 3:
when the illumination is very sufficient, the power supply path of the load is path one, if the output voltage of the photovoltaic power supply is higher than a certain value, such as cUN(C>1) The voltage may be too high and damage the load. In order to avoid such a problem, another charging path for the secondary battery 10 is designed; when the voltage comparator D6 detects that the voltage across the load is higher than cUNWhen the output is high, the switching tube S12 is triggered to be turned on, and the battery 10 is charged with redundant electric energy.
Claims (4)
1. Independent light storage power supply system of transmission line monitoring devices with prevent wind characteristic, its characterized in that: the photovoltaic power generation tower comprises a tower (9) and a storage battery (10), wherein the tower (9) comprises four angle irons, the angle irons are connected through a connecting frame, the angle irons are right-angled, two photovoltaic modules are arranged on the surface of each angle iron, and the total number of the photovoltaic modules is eight, namely a first photovoltaic module (1), a second photovoltaic module (2), a third photovoltaic module (3), a fourth photovoltaic module (4), a fifth photovoltaic module (5), a sixth photovoltaic module (6), a seventh photovoltaic module (7) and an eighth photovoltaic module (8); the photovoltaic module supplies power to the storage battery (10) and the detection device (11) through a charging and discharging management circuit.
2. The independent optical storage power supply system with the windproof characteristic for the power transmission line monitoring device according to claim 1, characterized in that: the photovoltaic module is characterized in that the first photovoltaic module (1) is connected with the eighth photovoltaic module (8) in parallel, the second photovoltaic module (2) is connected with the third photovoltaic module (3) in parallel, the fourth photovoltaic module (4) is connected with the fifth photovoltaic module (5) in parallel, the sixth photovoltaic module (6) is connected with the seventh photovoltaic module (7) in parallel, and four parallel modules formed after parallel connection are sequentially connected in series end to end.
3. The independent optical storage power supply system with the windproof characteristic for the power transmission line monitoring device according to claim 2, characterized in that: the photovoltaic module cut-in and cut-out control unit (12) is further included, and the photovoltaic module cut-in and cut-out control unit (12) comprises a voltage comparator, an N-channel MOSFET and a P-channel MOSFET;
the positive electrode of a power supply of the eighth photovoltaic module (8) is respectively electrically connected with the drain electrode of the switch tube S1, the source electrode of the switch tube S1 is electrically connected with the drain electrode of the switch tube S5 and the positive input end of the voltage comparator D1, and the negative electrode of the power supply output end of the eighth photovoltaic module (8) is respectively electrically connected with the grid electrode of the switch tube S1, the grid electrode of the switch tube S5 and the output end of the voltage comparator D1;
the positive electrode of the power output end of the third photovoltaic module (3) is respectively electrically connected with the drain electrode of the switch tube 2, the source electrode of the switch tube S2 is electrically connected with the drain electrode of the switch tube S6 and the positive input end of the voltage comparator D2, and the negative electrode of the power supply of the third photovoltaic module (3) is respectively electrically connected with the grid electrode of the switch tube S2, the grid electrode of the switch tube S6 and the output end of the voltage comparator D2;
the positive electrode of a power supply of the fifth photovoltaic module (5) is respectively electrically connected with the drain electrode of the switching tube S3, the source electrode of the switching tube S3 is electrically connected with the drain electrode of the switching tube S7 and the positive input end of the voltage comparator D3, and the negative electrode of the power supply of the fifth photovoltaic module (5) is respectively electrically connected with the grid electrode of the switching tube S3, the grid electrode of the switching tube S7 and the output end of the voltage comparator D3;
the positive electrode of the power supply of the seventh photovoltaic module (7) is respectively electrically connected with the drain electrode of the switch tube S4, the source electrode of the switch tube S4 is electrically connected with the drain electrode of the switch tube S8 and the positive input end of the voltage comparator D4, and the negative electrode of the power supply of the seventh photovoltaic module (7) is respectively electrically connected with the grid electrode of the switch tube S4, the grid electrode of the switch tube S8 and the output end of the voltage comparator D4.
4. The independent optical storage power supply system with the windproof characteristic for the power transmission line monitoring device according to claim 3, characterized in that: the drain of the switch tube S5 is respectively connected with the drain of the switch tube S9, the source of the switch tube S10 and the hysteresis comparatorD5The inverting input end of the switch is electrically connected;
leakage of switch tube S10The pole of the diode is respectively connected with the source electrode of the switch tube S11 and the diode DAKAnode is electrically connected, diode DAKThe cathode is respectively and electrically connected with the drain of the switch tube S12, the positive input end of the voltage comparator D6, one end of the capacitor C and one end of the load R, and the gate of the switch tube S12 is electrically connected with the output end of the voltage comparator D6;
the source electrode of the switch tube S9 and the source electrode of the switch tube S12 are respectively and electrically connected with the input end of the charging management circuit, and the output end of the charging management circuit is electrically connected with the power supply input end of the storage battery;
the output end of the storage battery power supply is electrically connected with the input end of the discharge management circuit, and the output end of the discharge management circuit is electrically connected with the drain electrode of the switch tube S11;
the other end of the capacitor C and the other end of the load R are electrically connected with the cathode of the output end of the discharge management circuit, and the source electrode of the switch tube S8 is electrically connected with the cathode of the input end of the charge management circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921643830.0U CN210898620U (en) | 2019-09-29 | 2019-09-29 | Power transmission line monitoring device independent optical storage power supply system with windproof characteristic |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921643830.0U CN210898620U (en) | 2019-09-29 | 2019-09-29 | Power transmission line monitoring device independent optical storage power supply system with windproof characteristic |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114050617A (en) * | 2021-09-29 | 2022-02-15 | 云南电网有限责任公司 | Intelligent power management circuit for tower |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114050617A (en) * | 2021-09-29 | 2022-02-15 | 云南电网有限责任公司 | Intelligent power management circuit for tower |
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