CN111580586A - Power distribution room temperature and humidity automatic control system for ensuring safety of switch cabinet - Google Patents
Power distribution room temperature and humidity automatic control system for ensuring safety of switch cabinet Download PDFInfo
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- CN111580586A CN111580586A CN202010632425.XA CN202010632425A CN111580586A CN 111580586 A CN111580586 A CN 111580586A CN 202010632425 A CN202010632425 A CN 202010632425A CN 111580586 A CN111580586 A CN 111580586A
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 36
- 229910052802 copper Inorganic materials 0.000 claims abstract description 36
- 239000010949 copper Substances 0.000 claims abstract description 36
- 238000004891 communication Methods 0.000 claims abstract description 27
- 238000012544 monitoring process Methods 0.000 claims abstract description 23
- 238000005259 measurement Methods 0.000 claims abstract description 6
- 238000006243 chemical reaction Methods 0.000 claims description 12
- 239000004020 conductor Substances 0.000 claims description 12
- 239000011810 insulating material Substances 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 4
- 238000005070 sampling Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D27/00—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00
- G05D27/02—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00 characterised by the use of electric means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
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Abstract
The invention discloses a power distribution room temperature and humidity automatic control system for ensuring the safety of a switch cabinet, which belongs to the technical field of switch cabinet temperature and humidity control systems and comprises a switch cabinet, a temperature and humidity current measuring module, a remote communication module and a temperature and humidity monitoring server, data receiving and sending module, cubical switchboard humiture decision module, bus duct and control module, humiture current measurement module, remote communication module and control module all install the inside at the cubical switchboard, data receiving and sending module and cubical switchboard humiture decision module are all installed in the inside of temperature and humidity monitoring server, temperature and humidity control system includes communication module and temperature and humidity control center, can have different current temperature rise requirements to set up different rated currents according to different bus duct connection copper bar types and materials, the maximum current bearing capacity that the copper bar is connected to the bus duct of performance does not cause the loss that the copper bar is connected to the bus duct to lead to the emergence of the dangerous condition at last.
Description
Technical Field
The invention relates to the technical field of switch cabinet temperature and humidity control systems, in particular to a power distribution room temperature and humidity automatic control system for ensuring the safety of a switch cabinet.
Background
With the rapid development of intelligent buildings and intelligent monitoring, a power distribution room is an essential part of modern buildings as a power supply control center, and the scale of the power distribution room is larger and larger, so that the power supply requirement of the power distribution room is higher and higher. In fact, in order to reduce the cost and standardize the installation, more and more power distribution rooms use the bus duct to connect the copper bar to access the switch cabinet for power supply. Because the current is higher, very high requirements are put forward to the humiture of cubical switchboard to guarantee the safety and the suitable life of cubical switchboard.
The humiture of cubical switchboard has very big difference with environment humiture usually, on the one hand because the time spent can influence the humiture when the electric current that the cubical switchboard passed through is big, and the cubical switchboard usually is far away with distribution room temperature humidity controller like the air conditioner distance in addition, therefore the cubical switchboard need oneself solitary humiture and current measurement to control the regulation.
The bus duct connecting copper bars have certain rated current, but different temperatures correspond to different rated currents. The bus duct connecting copper bar is not required to exceed rated current specified under the temperature condition at that time when working. Generally speaking, the higher the temperature, the lower the rated current allowed by the bus duct connecting copper bar.
In the existing bus duct serving as a power supply part of a switch cabinet, a temperature and current detection system of a connecting copper bar is set or only one absolute current is set, and an alarm is given when the absolute current is exceeded; or an absolute temperature is set, an alarm is given when the absolute temperature is exceeded, the current carrying capacity of the bus duct connecting copper bar is limited to a certain extent, and the loss of the bus duct connecting copper bar is easily caused to finally cause the dangerous condition.
Based on the above, the invention designs the automatic control system for the temperature and the humidity of the power distribution room, which ensures the safety of the switch cabinet, so as to solve the problems.
Disclosure of Invention
The invention aims to provide a power distribution room temperature and humidity automatic control system for ensuring the safety of a switch cabinet, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a distribution room temperature and humidity automatic control system for ensuring safety of a switch cabinet comprises a switch cabinet, a temperature and humidity current measuring module, a remote communication module, a temperature and humidity monitoring server, a data receiving and sending module, a switch cabinet temperature and humidity judging module, a bus duct and a control module, a temperature and humidity current measuring module, a remote communication module and a control module are installed inside the switch cabinet, a data receiving and sending module and a switch cabinet temperature and humidity judging module are installed inside the temperature and humidity monitoring server, the temperature and humidity control system comprises a communication module and a temperature and humidity control center, the temperature and humidity current measuring module is used for acquiring the temperature of copper bar conductors inside the switch cabinet and on a bus duct interface part, humidity and current data, the control module is used for judging whether absolute current or temperature and humidity data exceed a local set absolute threshold value 1, the remote temperature and humidity monitoring server is used for receiving the periodical temperature and humidity and current The switch cabinet temperature and humidity judging module in the remote temperature and humidity monitoring server analyzes and judges whether the temperature, humidity and current cross a threshold value 2 obtained by server query according to performance parameters of copper bar conductors in the corresponding switch cabinet and bus duct interface part, and the data receiving and sending module is used for sending an instruction to a temperature and humidity control system in a power distribution room.
Preferably, the temperature and humidity current measuring module is divided into a temperature and humidity sensor acquisition submodule and a current transformer acquisition submodule.
Preferably, the temperature and humidity sensor acquisition submodule is located between the switch cabinet and a bus duct connecting copper bar power supply interface, and is respectively a bus duct access end and a switch cabinet inlet, the bus duct access end and the switch cabinet inlet are three-phase four-wire system A, B, C, N and are arranged in the same sequence, the bus duct access end and the switch cabinet inlet are connected with the copper bar through the bus duct and are plugged together to provide electric connection, the bus duct access end and the switch cabinet inlet are oppositely arranged, the positions where the bus duct access end and the switch cabinet inlet are in contact are overlapping parts, one end of the bus duct access end opposite to the switch cabinet inlet is provided with a first inclined part, one end of the switch cabinet inlet opposite to the bus duct access end is provided with a second inclined part, the other end of the first inclined part and the other end of the second inclined part are both provided with straight parts, The two end parts of the first inclined part, the second inclined part and the switch cabinet inlet are wrapped by insulating materials, four temperature and humidity sensors are fixed on four phase lines of the switch cabinet inlet respectively, and the other ends of the temperature and humidity sensors are connected to a control panel inside the switch cabinet.
Preferably, the current transformer acquisition submodule comprises four current transformers, the four current transformers are respectively sleeved around four power supply lines of the bus duct connecting copper bars, the four power supply lines comprise a live line A, a live line B, a live line C and a zero line, in the single-circuit connection, the current transformers are connected with resistors in series, one end of each resistor is connected with a VDD/power supply and the negative electrode of the ADC input end of the analog-to-digital conversion module, the other end of each resistor is connected with the positive electrode of the ADC input end of the analog-to-digital conversion module and is connected with the switch cabinet control module, and voltages obtained by sampling of the ADC in the four power supply lines are converted into the current.
Preferably, the analog-to-digital conversion module ADC307 may use a discrete ADC chip on a PCB, or may use an ADC inside a switch cabinet control module chip.
Preferably, the remote communication module and the communication module are connected to the router and then reach the internet in a power carrier and wireless hybrid communication mode, the power carrier adopts an international standard HomePlug or a national power carrier communication standard, and the power carrier adopts a Zigbee or WiFi protocol in a wireless mode.
Preferably, the temperature and humidity monitoring server comprises a software program capable of analyzing the characteristics of the copper bar interface conductors connected to the specific bus duct, and has the functions of alarming by a mobile phone and sending instructions to the corresponding power distribution room temperature and humidity control system.
Compared with the prior art, the invention has the beneficial effects that: the system can simultaneously consider the setting of different rated currents under different temperature conditions, alarm is given only when the bus duct connecting copper bar exceeds the rated current under the current temperature condition or exceeds a very large absolute temperature and humidity or current value, the current bearing capacity of the bus duct connecting copper bar is exerted to the maximum extent without causing the loss of the bus duct connecting copper bar to finally cause the occurrence of dangerous conditions, in addition, under the condition that the current bearing capacity exceeds a threshold value, on the one hand, an alarm signal is sent, and meanwhile, a temperature and humidity control system of a power distribution room is started to carry out automatic adjustment.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a bus duct connecting copper bar structure at the interface of the switch cabinet of the present invention;
FIG. 3 is a schematic diagram of a switchgear current measurement configuration and circuit of the present invention;
fig. 4 is a flow chart of the operation of the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
101. a switch cabinet; 102. a temperature, humidity and current measuring module; 103. a remote communication module; 104. a temperature and humidity monitoring server; 105. a data receiving and sending module; 106. a switch cabinet temperature and humidity determination module; 107. a temperature and humidity control system; 108. a communication module; 109. a temperature and humidity control center; 110. a bus duct; 111. a control module; 201. a bus duct access end; 202. a first inclined portion; 203. a straight portion; 204. an overlapping portion; 205. a second inclined portion; 206. an entrance of the switch cabinet; 207. a temperature and humidity sensor; 301. a current transformer; 302. a live line A; 303. a live line B; 304. a live line C; 305. a zero line; 306. a resistance; 307. an analog-to-digital conversion module ADC; 308. switch cabinet control module.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 4, the present invention provides a technical solution of an automatic temperature and humidity control system for a power distribution room to ensure safety of a switch cabinet: an automatic distribution room temperature and humidity control system for ensuring the safety of a switch cabinet comprises a switch cabinet 101, a temperature and humidity current measuring module 102, a remote communication module 103, a temperature and humidity monitoring server 104, a data receiving and sending module 105, a switch cabinet temperature and humidity judging module 106, a bus duct 110 and a control module 111, wherein the temperature and humidity current measuring module 102, the remote communication module 103 and the control module 111 are all installed inside the switch cabinet 101, the data receiving and sending module 105 and the switch cabinet temperature and humidity judging module 106 are all installed inside the temperature and humidity monitoring server 104, the temperature and humidity control system 107 comprises a communication module 108 and a temperature and humidity control center 109, the temperature and humidity current measuring module 102 is used for acquiring the temperature, humidity and current data of copper bar conductors at the interface parts of the inside of the switch cabinet 101 and the bus duct 110, and the control module 111 is used for judging whether the absolute current or the, the remote temperature and humidity monitoring server 104 is used for receiving temperature, humidity and current data periodically sent by the switch cabinet 101 through the remote communication module 103, the switch cabinet temperature and humidity determination module 106 in the remote temperature and humidity monitoring server 104 analyzes and determines whether the temperature, humidity and current cross a threshold value 2 obtained by server query according to performance parameters of copper bar conductors in the corresponding switch cabinet 101 and bus duct 110 interface portions, whether the temperature, humidity and current cross the threshold value is determined to be sent to a mobile phone for alarm according to situations, meanwhile, the data receiving and sending module 105 sends an instruction to the temperature and humidity control system 107 in the power distribution room, and the temperature and humidity control system 107 is automatically started to adjust the temperature and humidity.
The temperature and humidity current measuring module 102 is divided into a temperature and humidity sensor collecting submodule and a current transformer collecting submodule.
The temperature and humidity sensor acquisition submodule is positioned between a switch cabinet 101 and a bus duct 110 connecting copper bar power supply interface, two ends of the temperature and humidity sensor acquisition submodule are respectively provided with a bus duct access end 201 and a switch cabinet inlet 206, the bus duct access end 201 and the switch cabinet inlet 206 are both three-phase four-wire systems A, B, C, N and are arranged in the same sequence, the bus duct access end 201 and the switch cabinet inlet 206 are connected with the copper bar through the bus duct 110 in a plugging mode to provide electric connection, the bus duct access end 201 and the switch cabinet inlet 206 are oppositely arranged, the contact position of the bus duct access end 201 and the switch cabinet inlet 206 is an overlapping part 204, one end of the bus duct access end 201 opposite to the switch cabinet inlet 206 is provided with a first inclined part 202, one end of the switch cabinet inlet 206 opposite to the bus duct access end 201 is provided with a second inclined part 205, and the other, the crossing position of two straight portions 203 is overlap portion 204, overlap portion 204 bus duct incoming end 201, first rake 202, second rake 205 and the both ends of cubical switchboard entrance 206 are all wrapped up with insulating material, make it isolated with the outside air, what have only space and each phase conductor contact is overlap portion 204 upper and lower adjacent straight portion 203, four temperature and humidity sensors 207 are fixed respectively on four phase lines of cubical switchboard entrance 206, and temperature and humidity sensor 207's the other end is connected to cubical switchboard 101 inside control panel 111.
The current transformer acquisition sub-module comprises four current transformers 301, the four current transformers 301 are respectively sleeved around four power supply lines connected with a copper bar through the bus duct 110, the four power supply lines comprise a live line A302, a live line B303, a live line C304 and a zero line 305, in one-way connection, the current transformers 301 and the resistors 306 are connected in series, one ends of the resistors 306 are connected with a VDD/2 power supply and the negative electrode of the input end of the analog-to-digital conversion module ADC307, the other ends of the resistors 306 are connected with the positive electrode of the input end of the analog-to-digital conversion module ADC307 and are connected with the switch cabinet control module 308, and voltages obtained by sampling of the analog-to-digital conversion modules ADC.
The analog-to-digital conversion module ADC (307 may be a discrete ADC chip on a PCB or an ADC inside the switch cabinet control module 308 chip.
The remote communication module 103 and the communication module 108 are connected to a router and then reach the internet in a power carrier and wireless hybrid communication mode, the power carrier adopts an international standard HomePlug, the wireless mode adopts a Zigbee or WiFi protocol, and the wired mode and the wireless mode can be switched with each other, so that the stability and the reliability of communication are ensured.
The temperature and humidity monitoring server 104 comprises a software program capable of analyzing the characteristics of the copper bar interface conductors connected to the specific bus duct 110, has the functions of mobile phone alarm and instruction sending to the corresponding power distribution room temperature and humidity control system 107, and can analyze and judge the working condition of the electrical system according to the normal working temperature range, the humidity range and the current range of the electrical product, and diagnose and prevent faults in real time.
One specific application of this embodiment is: the temperature and humidity acquisition and current acquisition system of the switch cabinet 101 samples and collects data according to a period set by a user, the control module 111 controls the temperature and humidity determination module 106 of the switch cabinet to determine the acquired temperature and humidity or current value, if the acquired temperature and humidity or current value exceeds a local threshold value 1 set by the switch cabinet control module 308, the local control module 111 starts local alarm, the alarm is performed by sounding and lighting or electric signals, and power supply current to the switch cabinet 101 is immediately cut off, the switch cabinet control module 308 periodically transmits the acquired temperature and humidity and current data to the temperature and humidity monitoring server 104 through remote communication 103, the temperature and humidity determination module 106 of the switch cabinet in the temperature and humidity monitoring server 104 calculates the rated current of a conductor under temperature and humidity according to the conductor material and the size of a copper bar interface connected with the switch cabinet 101 and the bus duct 110, if the rated current under the temperature and humidity exceeds the threshold 2 set by the temperature and humidity monitoring server 104, sending an instruction to a temperature and humidity control system 107 in the power distribution room through the data receiving and sending module 105, and automatically starting the temperature and humidity control system 107 to regulate the temperature and humidity in the power distribution room; if the measured current exceeds the calculated rated current, a mobile phone is sent to alarm to remind a manager of optimizing the load of the power distribution room so as to reduce current consumption, and the local temperature and humidity and current threshold value 1 of the switch cabinet 101 is a maximum safety threshold value and is respectively higher than the temperature and humidity and current threshold value 2 set by the server, so that if the temperature and humidity or the current collected by the switch cabinet 101 exceeds the local threshold value 1, the temperature and humidity monitoring server 104 is triggered to send a mobile phone alarm signal while local alarm is carried out.
The system can simultaneously consider the setting of different rated currents under different temperature conditions, alarm is given only when the copper bar connected to the bus duct 110 exceeds the rated current under the current temperature condition or exceeds a very large absolute temperature and humidity or current value, the current carrying capacity of the copper bar connected to the bus duct 110 is exerted to the maximum extent without causing the loss of the copper bar connected to the bus duct 110, and finally dangerous situations occur, in addition, under the condition that the current carrying capacity exceeds a threshold value, on one hand, an alarm signal is sent, and meanwhile, the temperature and humidity control system 107 of a power distribution room is started to perform automatic adjustment.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (7)
1. The utility model provides a guarantee cubical switchboard safety's automatic control system of distribution room humiture, its characterized in that includes cubical switchboard (101), humiture current measurement module (102), telecommunications module (103), humiture monitoring server (104), data receiving and sending module (105), cubical switchboard humiture judgement module (106), bus duct (110) and control module (111), humiture current measurement module (102), telecommunications module (103) and control module (111) are all installed in the inside of cubical switchboard (101), data receiving and sending module (105) and cubical switchboard humiture judgement module (106) are all installed in the inside of humiture monitoring server (104), humiture control system (107) includes communication module (108) and humiture control center (109), humiture current measurement module (102) are used for gathering and acquire the inside of cubical switchboard (101) and bus duct (110) interface portion copper bar conductor's temperature, temperature and humidity, Humidity and current data, control module (111) are used for judging whether absolute current or temperature and humidity data exceed local setting absolute threshold 1, long-range humiture monitoring server (104) are used for receiving cubical switchboard (101) periodicity and send temperature humidity and current data through remote communication module (103), cubical switchboard humiture decision module (106) in long-range humiture monitoring server (104) are according to in corresponding cubical switchboard (101) and bus duct (110) interface portion copper bar conductor's performance parameter analysis and judge humiture and current whether stride across server inquiry gained threshold 2, data receiving and sending module (105) are used for sending the instruction for humiture control system (107) in the electricity distribution room.
2. The automatic power distribution room temperature and humidity control system capable of ensuring safety of the switch cabinet according to claim 1, is characterized in that: the temperature and humidity current measuring module (102) is divided into a temperature and humidity sensor collecting submodule and a current transformer collecting submodule.
3. The automatic power distribution room temperature and humidity control system for ensuring the safety of the switch cabinet according to claim 2, is characterized in that: the temperature and humidity sensor acquisition submodule is positioned between copper bar power supply interfaces connected with the switch cabinet (101) and the bus duct (110) and respectively comprises a bus duct access end (201) and a switch cabinet inlet (206), the bus duct access end (201) and the switch cabinet inlet (206) are both three-phase four-wire systems A, B, C, N and are arranged in the same sequence, the bus duct access end (201) and the switch cabinet inlet (206) are connected with the copper bars through the bus duct (110) in an inserting mode to provide electric connection, the bus duct access end (201) and the switch cabinet inlet (206) are oppositely arranged, the positions where the bus duct access end (201) and the switch cabinet inlet (206) are in contact are an overlapping portion (204), a first inclined portion (202) is arranged at one end, opposite to the switch cabinet inlet (201), of the switch cabinet inlet (206) and the bus duct access end (201), and a second inclined portion (205) is arranged, the other end of first rake (202) and the other end of second rake (205) all are provided with straight portion (203), two the crossing position of straight portion (203) is overlap portion (204), overlap portion (204) bus duct incoming end (201), first rake (202), second rake (205) and the both ends of cubical switchboard entrance (206) are all wrapped with insulating material, four temperature and humidity sensors (207) are fixed respectively on four phase lines of cubical switchboard entrance (206), and the other end of temperature and humidity sensor (207) is connected to inside control panel (111) of cubical switchboard (101).
4. The automatic power distribution room temperature and humidity control system for ensuring the safety of the switch cabinet according to claim 2, is characterized in that: the current transformer gathers submodule piece and includes four current transformer (301), four current transformer (301) overlaps respectively around four power supply lines of copper bar are connected to bus duct (110), and four power supply lines include live wire A (302), live wire B (303), live wire C (304) and zero line (305), in the single-circuit connection, current transformer (301) and resistance (306) establish ties, the negative pole of a termination VDD 2 power and analog-to-digital conversion module ADC (307) input of resistance (306), the positive pole of another termination analog-to-digital conversion module ADC (307) input of resistance (306) to be connected with cubical switchboard control module (308), analog-to-digital conversion module ADC (307) sample gained voltage in four power supply lines turns into the current value of corresponding every phase line inside the chip.
5. The automatic power distribution room temperature and humidity control system for ensuring the safety of the switch cabinet according to claim 4, is characterized in that: the analog-to-digital conversion module ADC (307) can adopt a discrete ADC chip on a PCB, and can also adopt an ADC in a switch cabinet control module (308) chip.
6. The automatic power distribution room temperature and humidity control system capable of ensuring safety of the switch cabinet according to claim 1, is characterized in that: the remote communication module (103) and the communication module (108) are connected to a router in a power carrier and wireless hybrid communication mode and then reach the Internet, the power carrier adopts an international standard HomePlug or a national grid power carrier communication standard, and a Zigbee or WiFi protocol is adopted in a wireless mode.
7. The automatic power distribution room temperature and humidity control system capable of ensuring safety of the switch cabinet according to claim 1, is characterized in that: the temperature and humidity monitoring server (104) comprises a software program capable of analyzing the characteristics of a conductor of a copper bar interface connected to a specific bus duct (110), and has the functions of alarming by a mobile phone and sending instructions to a corresponding power distribution room temperature and humidity control system (107).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114243520A (en) * | 2021-12-08 | 2022-03-25 | 王启明 | Low-voltage switchgear copper bar intelligence cooling system based on internet technique |
| CN116914920A (en) * | 2023-06-16 | 2023-10-20 | 镇江加勒智慧电力科技股份有限公司 | Monitoring protection system of bus duct |
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