CN111900653A - Automatic ventilation and dust prevention device and method for transformer substation cable interlayer - Google Patents

Automatic ventilation and dust prevention device and method for transformer substation cable interlayer Download PDF

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Publication number
CN111900653A
CN111900653A CN202010781414.8A CN202010781414A CN111900653A CN 111900653 A CN111900653 A CN 111900653A CN 202010781414 A CN202010781414 A CN 202010781414A CN 111900653 A CN111900653 A CN 111900653A
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China
Prior art keywords
contactor
motor
dust
module
normally open
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CN202010781414.8A
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CN111900653B (en
Inventor
周庆
王伟亮
张�浩
毕经国
雷志敏
张国奎
刘朝霞
冀友
高超
公茂果
卢凤
陈志慧
张军良
于洁
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State Grid Corp of China SGCC
Laiwu Power Supply Co of State Grid Shandong Electric Power Co Ltd
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State Grid Corp of China SGCC
Laiwu Power Supply Co of State Grid Shandong Electric Power Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
    • H02B1/56—Cooling; Ventilation
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
    • H02B1/26—Casings; Parts thereof or accessories therefor
    • H02B1/28—Casings; Parts thereof or accessories therefor dustproof, splashproof, drip-proof, waterproof or flameproof
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B7/00—Enclosed substations, e.g. compact substations
    • H02B7/06—Distribution substations, e.g. for urban network

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Ventilation (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention provides a substation cable interlayer automatic ventilation dustproof device and a method, wherein a control module is connected with a motor through a motor driving module; the motor is connected with a ventilation device of the cable interlayer chamber, and the motor controls the ventilation device to be turned on or off according to a control instruction; the control module is connected with the dust concentration acquisition module to acquire the dust state of the outdoor environment, and when the dust state exceeds a threshold value, the ventilation device is controlled to be closed; the control module is connected with the wind speed acquisition module to acquire the wind speed of the outdoor environment, and when the wind speed exceeds a threshold value, the control module controls the ventilation device to be closed; the control module is connected with the weather information acquisition module to acquire whether the outdoor environment is rainy or not, and when the outdoor environment is rainy, the ventilation device is controlled to be closed. Can open the device that opens and shuts automatically according to the external environment condition realization ventilation window, open the window when external environment is good, close the window when external environment is relatively poor to improve cable intermediate layer ventilation effect and efficiency.

Description

Automatic ventilation and dust prevention device and method for transformer substation cable interlayer
Technical Field
The invention relates to the technical field of transformer substations, in particular to an automatic ventilation and dust prevention device and method for a transformer substation cable interlayer.
Background
The cable interlayer is a structural layer for laying cables entering a high-voltage switch room, a distribution room, a control room, a protection room and the like in a transformer substation and is generally positioned below a horizontal plane. The cable interlayer is a key fire-fighting part of the transformer substation and needs to be kept clean and smooth, and meanwhile, dust particles and macromolecular gases such as SF6 leaked under abnormal conditions can be gathered in the cable interlayer due to the fact that the cable interlayer is located at the lowest point of the transformer substation, so that the cable interlayer is generally provided with ventilation devices such as windows and the like and used for carrying out convection ventilation with the outside so as to reduce the concentration of the dust particles, toxic gases and the like, and a good operation environment of the cable interlayer is kept. The current transformer substation is unattended, and patrols the personnel regularly to patrol. The current ventilation mode is for patrolling personnel to open cable intermediate layer window when patrolling the transformer substation, and patrol and close the window after accomplishing, and this kind of mode ventilation effect is relatively poor, inefficiency, and moreover Shandong Laiwu ground in Lu, the heavy industry such as steel and iron, colliery, chemical industry is many, and air pollution is heavier, and outside wind and dust granule still can get into inside the cable intermediate layer when the cable intermediate layer ventilates, loses ventilation effect.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides an automatic ventilation and dust prevention device for a cable interlayer of a transformer substation, which comprises: the device comprises a dust concentration acquisition module, a wind speed acquisition module, a weather information acquisition module, a control module, a motor and a motor driving module;
the control module is connected with the motor through the motor driving module; the motor is connected with a ventilation device of the cable interlayer chamber, and the motor controls the ventilation device to be turned on or off according to a control instruction;
the control module is connected with the dust concentration acquisition module to acquire the dust state of the outdoor environment, and when the dust state exceeds a threshold value, the ventilation device is controlled to be closed;
the control module is connected with the wind speed acquisition module to acquire the wind speed of the outdoor environment, and when the wind speed exceeds a threshold value, the control module controls the ventilation device to be closed;
the control module is connected with the weather information acquisition module to acquire whether the outdoor environment is rainy or not, and when the outdoor environment is rainy, the ventilation device is controlled to be closed.
It should be further noted that the control module includes: the photoelectric coupling circuit comprises a controller, a resistor R7, a resistor R8, a diode D1, a photoelectric coupling chip U1 and a contactor KM 1;
the controller is provided with three NOT gate modules and two AND gate modules;
the dust concentration acquisition module is connected with a first input end of the first AND gate module through the first NOT gate module;
the wind speed acquisition module is connected with a second input end of the first AND gate module through a second NOT gate module;
the weather information acquisition module is connected with a second input end of the second AND gate module through a third NOT gate module;
the output end of the first AND gate module is connected with the first input end of the second AND gate module;
the output end of the second AND gate module is respectively connected with the cathode of the diode D1 and the first interface of the photoelectric coupling chip U1 through a resistor R7, and the second interface of the photoelectric coupling chip U1 is connected with the anode of the diode D1; the fourth interface of the photoelectric coupling chip U1 is grounded; the third interface of the photoelectric coupling chip U1 is connected with a power supply through a contactor KM1 coil and a resistor R8;
after receiving the connection signal, the photoelectric coupling chip U1 electrified the coil of the contactor KM 1.
It is further noted that the dust concentration acquisition module adopts a dust concentration sensor with a model of KFC-A1;
the dust concentration acquisition module is provided with five terminals, wherein the terminal 1 is connected with a 24V direct current voltage VC1, and the terminal 2 is a current output IO1 Terminal 3 is a voltage output VO2Terminal 4 is connected with relay SB1；
When the concentration reaches a set value, the relay is closed and switched on, and when the concentration is lower than the set value, the relay is switched off, and the terminal 5 is connected with the relay SB2When the concentration exceeds the upper limit, the switch is switched on, and when the concentration is lower than the upper limit, the switch is switched off; relay SB1And SB2After parallel connection, one end of the resistor is connected with a 24V direct current power supply after passing through a protective resistor R1, and the other end of the resistor is grounded after passing through R2;
r1 is 20 omega, R2 is 1K omega;
when relay SB1And relay SB2At any closing time, the output end VO2High level, otherwise, low level is output.
It is further noted that the wind speed acquisition module adopts a three-cup type wind speed sensor;
terminal 1 of wind speed acquisition module is connected with 24V direct current voltage VC2Terminal 3 is a voltage output terminal VFSThe voltage value rises with the increase of the wind speed;
presetting wind power levels from 1 to 12 to output voltages from 0.17V to 5V respectively;
terminal 4 is a current output terminal IFS(ii) a Voltage output terminal VFSThe testing resistor R3 is connected, the other end of the resistor R3 is respectively connected with the protective resistor R4 and the 1 base electrode of the triode T1, and the 2 collector electrode of the triode T1 is connected with a 24V direct-current power supply V through an auxiliary switch KM1C3The 3 emitter of the triode T1 is grounded through a current limiting resistor R5;
when the wind power rises to reach 4 levels, the triode is conducted by adjusting the resistance value of the test resistor R1, and V isO3Outputting high level, closing the window through a control loop and a motor driving module, disconnecting a travel switch KX after the ventilation device is closed, and cutting off the loop;
r4 is 1 K.OMEGA.and R5 is 1 K.OMEGA..
It is further noted that the air information acquisition module adopts a deeply named raindrop control relay;
one end of a deep famous raindrop control relay SB3 passes through a protective resistor R6 and a 24V direct-current power supply VC4The other end of the resistor is connected with the ground through a resistor R7;
outdoor raindrop control relay SB3Closed, VO4Relay S for outputting high level and no raindropB3Opening, VO4And outputting a low level.
Further, it should be noted that the method further includes: smoke sensor and SF6 sensor;
the smoke sensor is used for sensing smoke information in a cable interlayer of the transformer substation;
the SF6 sensor is used to sense SF6 information within the substation cable interlayer.
It should be further noted that the motor driving module includes: the device comprises a contactor KM2, a contactor KM3, a motor coil LC, a smoke controller auxiliary switch KY and a sulfur hexafluoride detection auxiliary switch KS;
the first end of the normally open node of the contactor KM1 and the first end of the normally closed node of the contactor KM1 are respectively connected with a power supply;
the second end of the normally open node of the contactor KM1 is respectively connected with the second end of the normally open node of the second contactor KM2 and the first end of the normally closed node of the contactor KM 3; the second end of the normally closed node of the contactor KM3 is grounded through a coil of the contactor KM2 and the normally closed node of the motor travel switch in sequence;
the second end of the normally closed node of the contactor KM1 is respectively connected with the second end of the normally open node of the second contactor KM3 and the first end of the normally closed node of the second contactor KM 2; the second end of the normally closed node of the second contactor KM2 is grounded through the coil of the contactor KM3 and the normally open node of the first motor travel switch in sequence;
the first end of an auxiliary switch KY of the first smoke controller, the first end of a first sulfur hexafluoride detection auxiliary switch KS, the first end of a normally open node of a first contactor KM2, the first end of a normally open node of a second contactor KM2, the first end of a normally open node of a first contactor KM3 and the first end of a normally open node of a second contactor KM3 are respectively connected with a power supply;
a second end of an auxiliary switch KY of the first smoke-sensing controller and a second end of a first sulfur hexafluoride detection auxiliary switch KS are respectively connected with a first end of a normally open node of a second motor travel switch;
the second end of the normally open node of the second motor travel switch is connected with the second end of the normally open node of a contactor KM2, the first end of the normally open node of a third contactor KM3 and the first end of a motor coil LC respectively;
the second end of a normally open node of the second contactor KM3 is connected with the first end of a normally open node of the third contactor KM2, the first end of a second smoke-sensitive controller auxiliary switch KY, the first end of a second sulfur hexafluoride detection auxiliary switch KS and the second end of a motor coil LC respectively;
the second end of a normally open node of the third contactor KM2 is connected with the second end of a second smoke-sensitive controller auxiliary switch KY, the second end of a second sulfur hexafluoride detection auxiliary switch KS, the second end of the normally open node of the third contactor KM3 and the motor respectively.
The invention also provides an automatic ventilation and dust prevention method for the transformer substation cable interlayer, which comprises the following steps:
when the dust amount of the outdoor environment is smaller than the preset dust threshold, the wind speed is smaller than the preset wind speed and exceeds the threshold, and the outdoor environment does not rain,
the motor driving module drives a motor to operate to drive the ventilation device to be started, so that ventilation is performed in the cable interlayer of the transformer substation;
when the dust amount of the outdoor environment is larger than a preset dust threshold, the wind speed is smaller than a preset wind speed and exceeds a threshold, and the outdoor environment does not rain, controlling to close the ventilation device;
when the outdoor environment rains, the ventilation device is controlled to be closed.
It is further noted that the method further comprises:
the coil of the contactor KM1 is electrified, the loop of the contactor KM3 is connected, the normally open auxiliary switch is closed, the normally closed auxiliary switch is disconnected, the current of the motor coil LC flows from the end 2 to the end 1, and the motor positively transmits the current to close the ventilation device;
when the coil of the contactor KM1 loses power, the loop of the contactor KM2 is switched on, the normally open auxiliary switch is switched on, the normally closed auxiliary switch is switched off, the current of the motor coil LC flows from the 1 end to the 2 end, and the motor reversely transmits to turn on the ventilation device;
when the smoke controller auxiliary switch KY is closed or the sulfur hexafluoride detection auxiliary switch KS is closed, the motor coil LC is conducted, and the ventilation device is started.
According to the technical scheme, the invention has the following advantages:
the automatic ventilation and dust prevention device for the transformer substation cable interlayer can realize the automatic opening and closing device of the ventilation window according to the external environment condition, the window is opened when the external environment is good, and the window is closed when the external environment is poor, so that the ventilation effect and the ventilation efficiency of the cable interlayer are improved.
The device utilizes sand and dust sensor, humidity transducer, air velocity transducer to gather outdoor information and transmit for control system, realizes that the intelligence of window opens and shuts to can avoid outdoor sand and dust, rainwater etc. to get into indoorly. Meanwhile, the device provided by the invention can acquire the indoor information of the cable interlayer through the smoke sensor and the SF6 sensor, and forcibly open a window to ventilate when smoke or SF6 exceeds the standard to alarm, so that the stable operation of a transformer substation is ensured.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description will be briefly introduced, 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 based on these drawings without creative efforts.
FIG. 1 is a schematic view of an automatic ventilation and dust prevention device for a cable interlayer of a transformer substation;
FIG. 2 is a schematic diagram of an embodiment of a control module;
FIG. 3 is a schematic diagram of an embodiment of a dust concentration collection module;
FIG. 4 is a schematic diagram of an embodiment of a dust concentration collection module;
FIG. 5 is a schematic view of an embodiment of a wind speed collection module;
FIG. 6 is a schematic diagram of an embodiment of a wind speed collection module;
fig. 7 is a schematic view of an embodiment of a motor driving module.
Detailed Description
Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the examples described in connection with the embodiments disclosed herein may be embodied in electronic hardware, computer software, or combinations of both, and that the components and steps of the examples have been described in a functional general in the foregoing description for the purpose of illustrating clearly the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The block diagrams shown in the figures are functional entities only and do not necessarily correspond to physically separate entities. I.e. these functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor means and/or microcontroller means.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may also be an electric, mechanical or other form of connection.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to provide a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that the invention may be practiced without one or more of the specific details, or with other methods, components, devices, steps, and so forth. In other instances, well-known methods, devices, implementations or operations have not been shown or described in detail to avoid obscuring aspects of the invention.
The invention provides an automatic ventilation and dust prevention device for a cable interlayer of a transformer substation, which comprises the following components as shown in figures 1 to 7: the device comprises a dust concentration acquisition module, a wind speed acquisition module, a weather information acquisition module, a control module, a motor and a motor driving module;
the control module is connected with the motor through the motor driving module; the motor is connected with a ventilation device of the cable interlayer chamber, and the motor controls the ventilation device to be turned on or off according to a control instruction; the control module is connected with the dust concentration acquisition module to acquire the dust state of the outdoor environment, and when the dust state exceeds a threshold value, the ventilation device is controlled to be closed;
the control module is connected with the wind speed acquisition module to acquire the wind speed of the outdoor environment, and when the wind speed exceeds a threshold value, the control module controls the ventilation device to be closed; the control module is connected with the weather information acquisition module to acquire whether the outdoor environment is rainy or not, and when the outdoor environment is rainy, the ventilation device is controlled to be closed.
As an embodiment of the present invention, a control module includes: the photoelectric coupling circuit comprises a controller, a resistor R7, a resistor R8, a diode D1, a photoelectric coupling chip U1 and a contactor KM 1;
the controller is provided with three NOT gate modules and two AND gate modules;
the dust concentration acquisition module is connected with a first input end of the first AND gate module through the first NOT gate module;
the wind speed acquisition module is connected with a second input end of the first AND gate module through a second NOT gate module;
the weather information acquisition module is connected with a second input end of the second AND gate module through a third NOT gate module;
the output end of the first AND gate module is connected with the first input end of the second AND gate module;
the output end of the second AND gate module is respectively connected with the cathode of the diode D1 and the first interface of the photoelectric coupling chip U1 through a resistor R7, and the second interface of the photoelectric coupling chip U1 is connected with the anode of the diode D1; the fourth interface of the photoelectric coupling chip U1 is grounded; the third interface of the photoelectric coupling chip U1 is connected with a power supply through a contactor KM1 coil and a resistor R8;
after receiving the connection signal, the photoelectric coupling chip U1 electrified the coil of the contactor KM 1.
The not gate module employs a not gate 74HC 04. The and gate module employs an and gate 74HC 08. Certainly, the not gate module and the and gate module may also be implemented by software, so that corresponding functions are implemented based on a processor or a single chip, and the software with the not gate module and the and gate module is configured inside the processor.
For the control module, the output V of the dust concentration acquisition module, the wind speed acquisition module and the weather information acquisition moduleO2、VO3、VO4After passing through a NOT gate 74HC04, the signals respectively pass through an AND gate 74HC08 and then output VO5Thus only VO2、VO3、VO4When outputting low level, namely dust is less than the set value, wind speed is less than 4 grades, and when it is not raining, the output VO5 outputs high level. VO5The photoelectric coupling chip NEC2501KK pin 1 is connected with a photoelectric coupling chip NEC2501KK pin 1 after passing through a resistor R7, the pin 1 and the pin 2 are connected with a diode, and the pin 3 passes through a contactor KM1 and a resistor R8 and then is connected with a direct-current power supply VC4Pin 4 is connected to ground. VO5When outputting high levelAnd the photoelectric coupling chip is conducted, and the contactor KM1 is closed.
As the embodiment of the invention, the dust concentration acquisition module adopts a dust concentration sensor with the model of KFC-A1;
the dust concentration acquisition module is provided with five terminals, wherein the terminal 1 is connected with a 24V direct current voltage VC1, and the terminal 2 is a current output IO1Terminal 3 is a voltage output VO2Terminal 4 is connected with relay SB1；
When the concentration reaches a set value, the relay is closed and switched on, and when the concentration is lower than the set value, the relay is switched off, and the terminal 5 is connected with the relay SB2When the concentration exceeds the upper limit, the switch is switched on, and when the concentration is lower than the upper limit, the switch is switched off; relay SB1And SB2After parallel connection, one end of the resistor is connected with a 24V direct current power supply after passing through a protective resistor R1, and the other end of the resistor is grounded after passing through R2; i.e. when relay S is in operationB1And relay SB2At any closing time, the output end VO2High level, otherwise, low level is output. The dust concentration acquisition module can also be provided with a display screen and an adjusting button.
R1 is 20 omega, R2 is 1K omega; therefore, the effect of filtering and current limiting can be achieved, and the detection precision is ensured.
As the embodiment of the invention, the wind speed acquisition module adopts a three-cup type wind speed sensor;
terminal 1 of wind speed acquisition module is connected with 24V direct current voltage VC2Terminal 3 is a voltage output terminal VFSThe voltage value rises with the increase of the wind speed;
presetting wind power levels from 1 to 12 to output voltages from 0.17V to 5V respectively;
terminal 4 is a current output terminal IFS(ii) a Voltage output terminal VFSThe testing resistor R3 is connected, the other end of the resistor R3 is respectively connected with the protective resistor R4 and the 1 base electrode of the triode T1, and the 2 collector electrode of the triode T1 is connected with a 24V direct-current power supply V through an auxiliary switch KM1C3The 3 emitter of the triode T1 is grounded through a current limiting resistor R5;
when the wind power rises to reach 4 levels, the triode is conducted by adjusting the resistance value of the test resistor R1, and V isO3Outputting high level, closing the window via control loop and motor driving module, and ventilatingAfter the device is closed, the travel switch KX is disconnected, and a loop is cut off;
here, the voltage value increases with the increase of the wind speed, the wind power is 1 to 12 grades and respectively outputs 0.17 to 5V voltage, and the terminal 4 is a current output end IFSThe current value increases with increasing wind speed. When the wind power rises to reach 4 levels, the triode is conducted by adjusting the resistance value of the test resistor R1, and V isO3And outputting high level, closing the window through a control loop and a motor driving loop to prevent garbage such as plastic bags and the like from being blown into the cable interlayer by too high wind power, and disconnecting a travel switch KX after the ventilation device is closed to cut off the loop.
R4 is 1 K.OMEGA.and R5 is 1 K.OMEGA..
As the implementation mode of the invention, the air information acquisition module adopts a highly famous raindrop control relay; one end of a deep famous raindrop control relay SB3 passes through a protective resistor R6 and a 24V direct-current power supply VC4The other end of the resistor is connected with the ground through a resistor R7; outdoor raindrop control relay SB3Closed, VO4Relay S for outputting high level and no raindropB3Opening, VO4And outputting a low level.
As an embodiment of the present invention, the apparatus further comprises: smoke sensor and SF6 sensor; the smoke sensor is used for sensing smoke information in a cable interlayer of the transformer substation; the SF6 sensor is used to sense SF6 information within the substation cable interlayer.
The motor drive module includes: the device comprises a contactor KM2, a contactor KM3, a motor coil LC, a smoke controller auxiliary switch KY and a sulfur hexafluoride detection auxiliary switch KS;
the first end of the normally open node of the contactor KM1 and the first end of the normally closed node of the contactor KM1 are respectively connected with a power supply;
the second end of the normally open node of the contactor KM1 is respectively connected with the second end of the normally open node of the second contactor KM2 and the first end of the normally closed node of the contactor KM 3; the second end of the normally closed node of the contactor KM3 is grounded through a coil of the contactor KM2 and the normally closed node of the motor travel switch in sequence;
the second end of the normally closed node of the contactor KM1 is respectively connected with the second end of the normally open node of the second contactor KM3 and the first end of the normally closed node of the second contactor KM 2; the second end of the normally closed node of the second contactor KM2 is grounded through the coil of the contactor KM3 and the normally open node of the first motor travel switch in sequence;
the first end of an auxiliary switch KY of the first smoke controller, the first end of a first sulfur hexafluoride detection auxiliary switch KS, the first end of a normally open node of a first contactor KM2, the first end of a normally open node of a second contactor KM2, the first end of a normally open node of a first contactor KM3 and the first end of a normally open node of a second contactor KM3 are respectively connected with a power supply;
a second end of an auxiliary switch KY of the first smoke-sensing controller and a second end of a first sulfur hexafluoride detection auxiliary switch KS are respectively connected with a first end of a normally open node of a second motor travel switch;
the second end of the normally open node of the second motor travel switch is connected with the second end of the normally open node of a contactor KM2, the first end of the normally open node of a third contactor KM3 and the first end of a motor coil LC respectively;
the second end of a normally open node of the second contactor KM3 is connected with the first end of a normally open node of the third contactor KM2, the first end of a second smoke-sensitive controller auxiliary switch KY, the first end of a second sulfur hexafluoride detection auxiliary switch KS and the second end of a motor coil LC respectively;
the second end of a normally open node of the third contactor KM2 is connected with the second end of a second smoke-sensitive controller auxiliary switch KY, the second end of a second sulfur hexafluoride detection auxiliary switch KS, the second end of the normally open node of the third contactor KM3 and the motor respectively.
The invention also provides an automatic ventilation and dust prevention method for the transformer substation cable interlayer, which comprises the following steps:
when the dust amount of the outdoor environment is smaller than the preset dust threshold, the wind speed is smaller than the preset wind speed and exceeds the threshold, and the outdoor environment does not rain,
the motor driving module drives a motor to operate to drive the ventilation device to be started, so that ventilation is performed in the cable interlayer of the transformer substation;
when the dust amount of the outdoor environment is larger than a preset dust threshold, the wind speed is smaller than a preset wind speed and exceeds a threshold, and the outdoor environment does not rain, controlling to close the ventilation device;
when the outdoor environment rains, the ventilation device is controlled to be closed.
If the dust amount of the outdoor environment is smaller than the preset dust threshold, the wind speed is larger than the preset wind speed and exceeds the threshold, and the outdoor environment does not rain, the ventilation device is controlled to be closed;
the ventilation device may be a window at the side of the substation cable interlayer, or a window at the top of the substation cable interlayer, etc.
With reference to the foregoing embodiment, the method further includes:
the coil of the contactor KM1 is electrified, the loop of the contactor KM3 is connected, the normally open auxiliary switch is closed, the normally closed auxiliary switch is disconnected, the current of the motor coil LC flows from the end 2 to the end 1, and the motor positively transmits the current to close the ventilation device;
when the coil of the contactor KM1 loses power, the loop of the contactor KM2 is switched on, the normally open auxiliary switch is switched on, the normally closed auxiliary switch is switched off, the current of the motor coil LC flows from the 1 end to the 2 end, and the motor reversely transmits to turn on the ventilation device;
when the smoke controller auxiliary switch KY is closed or the sulfur hexafluoride detection auxiliary switch KS is closed, the motor coil LC is conducted, and the ventilation device is started.
Therefore, the device can realize the automatic opening and closing of the ventilating window according to the external environment condition, the window is opened when the external environment is good, and the window is closed when the external environment is poor, so that the ventilating effect and the ventilating efficiency of the cable interlayer are improved.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (9)

1. The utility model provides an automatic dust keeper that ventilates of transformer substation's cable intermediate layer which characterized in that includes: the device comprises a dust concentration acquisition module, a wind speed acquisition module, a weather information acquisition module, a control module, a motor and a motor driving module;
the control module is connected with the motor through the motor driving module; the motor is connected with a ventilation device of the cable interlayer chamber, and the motor controls the ventilation device to be turned on or off according to a control instruction;
the control module is connected with the dust concentration acquisition module to acquire the dust state of the outdoor environment, and when the dust state exceeds a threshold value, the ventilation device is controlled to be closed;
the control module is connected with the wind speed acquisition module to acquire the wind speed of the outdoor environment, and when the wind speed exceeds a threshold value, the control module controls the ventilation device to be closed;
the control module is connected with the weather information acquisition module to acquire whether the outdoor environment is rainy or not, and when the outdoor environment is rainy, the ventilation device is controlled to be closed.
2. The substation cable interlayer automatic ventilation dust-proof device of claim 1,
the control module includes: the photoelectric coupling circuit comprises a controller, a resistor R7, a resistor R8, a diode D1, a photoelectric coupling chip U1 and a contactor KM 1;
the controller is provided with three NOT gate modules and two AND gate modules;
the dust concentration acquisition module is connected with a first input end of the first AND gate module through the first NOT gate module;
the wind speed acquisition module is connected with a second input end of the first AND gate module through a second NOT gate module;
the weather information acquisition module is connected with a second input end of the second AND gate module through a third NOT gate module;
the output end of the first AND gate module is connected with the first input end of the second AND gate module;
the output end of the second AND gate module is respectively connected with the cathode of the diode D1 and the first interface of the photoelectric coupling chip U1 through a resistor R7, and the second interface of the photoelectric coupling chip U1 is connected with the anode of the diode D1; the fourth interface of the photoelectric coupling chip U1 is grounded; the third interface of the photoelectric coupling chip U1 is connected with a power supply through a contactor KM1 coil and a resistor R8;
after receiving the connection signal, the photoelectric coupling chip U1 electrified the coil of the contactor KM 1.
3. The substation cable interlayer automatic ventilation dust-proof device of claim 1,
the dust concentration acquisition module adopts a dust concentration sensor with the model of KFC-A1;
the dust concentration acquisition module is provided with five terminals, wherein the terminal 1 is connected with a 24V direct current voltage VC1, and the terminal 2 is a current output IO1Terminal 3 is a voltage output VO2Terminal 4 is connected with relay SB1；
When the concentration reaches a set value, the relay is closed and switched on, and when the concentration is lower than the set value, the relay is switched off, and the terminal 5 is connected with the relay SB2When the concentration exceeds the upper limit, the switch is switched on, and when the concentration is lower than the upper limit, the switch is switched off; relay SB1And SB2After parallel connection, one end of the resistor is connected with a 24V direct current power supply after passing through a protective resistor R1, and the other end of the resistor is grounded after passing through R2;
r1 is 20 omega, R2 is 1K omega;
when relay SB1And relay SB2At any closing time, the output end VO2High level, otherwise, low level is output.
4. The substation cable interlayer automatic ventilation dust-proof device of claim 1,
the wind speed acquisition module adopts a three-cup type wind speed sensor;
terminal 1 of wind speed acquisition module is connected with 24V direct current voltage VC2Terminal 3 being a voltage outputTerminal VFSThe voltage value rises with the increase of the wind speed;
presetting wind power levels from 1 to 12 to output voltages from 0.17V to 5V respectively;
terminal 4 is a current output terminal IFS(ii) a Voltage output terminal VFSThe testing resistor R3 is connected, the other end of the resistor R3 is respectively connected with the protective resistor R4 and the 1 base electrode of the triode T1, and the 2 collector electrode of the triode T1 is connected with a 24V direct-current power supply V through an auxiliary switch KM1C3The 3 emitter of the triode T1 is grounded through a current limiting resistor R5;
when the wind power rises to reach 4 levels, the triode is conducted by adjusting the resistance value of the test resistor R1, and V isO3Outputting high level, closing the window through a control loop and a motor driving module, disconnecting a travel switch KX after the ventilation device is closed, and cutting off the loop;
r4 is 1 K.OMEGA.and R5 is 1 K.OMEGA..
5. The substation cable interlayer automatic ventilation dust-proof device of claim 1,
the air information acquisition module adopts a deep famous raindrop control relay;
one end of a deep famous raindrop control relay SB3 passes through a protective resistor R6 and a 24V direct-current power supply VC4The other end of the resistor is connected with the ground through a resistor R7;
outdoor raindrop control relay SB3Closed, VO4Relay S for outputting high level and no raindropB3Opening, VO4And outputting a low level.
6. The substation cable interlayer automatic ventilation and dust prevention device of claim 2, further comprising: smoke sensor and SF6 sensor;
the smoke sensor is used for sensing smoke information in a cable interlayer of the transformer substation;
the SF6 sensor is used to sense SF6 information within the substation cable interlayer.
7. The substation cable interlayer automatic ventilation dust-proof device of claim 6,
the motor drive module includes: the device comprises a contactor KM2, a contactor KM3, a motor coil LC, a smoke controller auxiliary switch KY and a sulfur hexafluoride detection auxiliary switch KS;
the first end of the normally open node of the contactor KM1 and the first end of the normally closed node of the contactor KM1 are respectively connected with a power supply;
the second end of the normally open node of the contactor KM1 is respectively connected with the second end of the normally open node of the second contactor KM2 and the first end of the normally closed node of the contactor KM 3; the second end of the normally closed node of the contactor KM3 is grounded through a coil of the contactor KM2 and the normally closed node of the motor travel switch in sequence;
the second end of the normally closed node of the contactor KM1 is respectively connected with the second end of the normally open node of the second contactor KM3 and the first end of the normally closed node of the second contactor KM 2; the second end of the normally closed node of the second contactor KM2 is grounded through the coil of the contactor KM3 and the normally open node of the first motor travel switch in sequence;
the first end of an auxiliary switch KY of the first smoke controller, the first end of a first sulfur hexafluoride detection auxiliary switch KS, the first end of a normally open node of a first contactor KM2, the first end of a normally open node of a second contactor KM2, the first end of a normally open node of a first contactor KM3 and the first end of a normally open node of a second contactor KM3 are respectively connected with a power supply;
a second end of an auxiliary switch KY of the first smoke-sensing controller and a second end of a first sulfur hexafluoride detection auxiliary switch KS are respectively connected with a first end of a normally open node of a second motor travel switch;
the second end of the normally open node of the second motor travel switch is connected with the second end of the normally open node of a contactor KM2, the first end of the normally open node of a third contactor KM3 and the first end of a motor coil LC respectively;
the second end of a normally open node of the second contactor KM3 is connected with the first end of a normally open node of the third contactor KM2, the first end of a second smoke-sensitive controller auxiliary switch KY, the first end of a second sulfur hexafluoride detection auxiliary switch KS and the second end of a motor coil LC respectively;
the second end of a normally open node of the third contactor KM2 is connected with the second end of a second smoke-sensitive controller auxiliary switch KY, the second end of a second sulfur hexafluoride detection auxiliary switch KS, the second end of the normally open node of the third contactor KM3 and the motor respectively.
8. The automatic ventilation and dust prevention method for the cable interlayer of the transformer substation is characterized by comprising the following steps:
when the dust amount of the outdoor environment is smaller than the preset dust threshold, the wind speed is smaller than the preset wind speed and exceeds the threshold, and the outdoor environment does not rain,
the motor driving module drives a motor to operate to drive the ventilation device to be started, so that ventilation is performed in the cable interlayer of the transformer substation;
when the dust amount of the outdoor environment is larger than a preset dust threshold, the wind speed is smaller than a preset wind speed and exceeds a threshold, and the outdoor environment does not rain, controlling to close the ventilation device;
when the outdoor environment rains, the ventilation device is controlled to be closed.
9. The substation cable interlayer automatic ventilation and dust prevention method according to claim 8, further comprising:
the coil of the contactor KM1 is electrified, the loop of the contactor KM3 is connected, the normally open auxiliary switch is closed, the normally closed auxiliary switch is disconnected, the current of the motor coil LC flows from the end 2 to the end 1, and the motor positively transmits the current to close the ventilation device;
when the coil of the contactor KM1 loses power, the loop of the contactor KM2 is switched on, the normally open auxiliary switch is switched on, the normally closed auxiliary switch is switched off, the current of the motor coil LC flows from the 1 end to the 2 end, and the motor reversely transmits to turn on the ventilation device;
when the smoke controller auxiliary switch KY is closed or the sulfur hexafluoride detection auxiliary switch KS is closed, the motor coil LC is conducted, and the ventilation device is started.
CN202010781414.8A 2020-08-06 2020-08-06 Automatic ventilation and dust prevention device and method for transformer substation cable interlayer Active CN111900653B (en)

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