CN108986376B - Unattended alarm circuit of transformer substation and working method thereof - Google Patents
Unattended alarm circuit of transformer substation and working method thereof Download PDFInfo
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- CN108986376B CN108986376B CN201810950120.6A CN201810950120A CN108986376B CN 108986376 B CN108986376 B CN 108986376B CN 201810950120 A CN201810950120 A CN 201810950120A CN 108986376 B CN108986376 B CN 108986376B
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/22—Electrical actuation
- G08B13/24—Electrical actuation by interference with electromagnetic field distribution
- G08B13/2491—Intrusion detection systems, i.e. where the body of an intruder causes the interference with the electromagnetic field
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/16—Electric power substations
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Abstract
The invention discloses an unattended alarm circuit of a transformer substation and a working method thereof, wherein the unattended alarm circuit comprises one or more microwave inductive switches, a charge-discharge input control module, a power supply module, a charge-discharge module and an alarm module, wherein the one or more microwave inductive switches, the charge-discharge input control module, the power supply module, the charge-discharge module and the alarm module are arranged around an isolated transformer substation; the signal output end of the microwave inductive switch is connected with the signal input end of the charge-discharge input control module, the signal output end of the charge-discharge input control module is connected with the control end of the power supply module, the power output end of the power supply module is respectively connected with the microwave inductive switch, the charge-discharge input control module and the charge-discharge module, the microwave inductive switch, the charge-discharge input control module and the charge-discharge module are respectively powered, the charge-discharge input control module controls the power supply module to supply power to the charge-discharge module according to the signal output by the microwave inductive switch, and the power output end of the charge-discharge module is connected with the alarm module. The invention can alarm the personnel entering the transformer substation area, remind the personnel away from the transformer substation and prevent accidents.
Description
Technical Field
The invention relates to the technical field of transformer substation safety, in particular to an unattended alarm circuit of a transformer substation and a working method thereof.
Background
In recent years, accidents such as electric shock accidents, equipment damage in a station and the like caused by personnel false running frequently occur, and great threat is caused to personnel and equipment safety. In order to reduce the rate of electric shock accidents in a station caused by personnel false break, improve the management level of personnel false break, solve the problem of timely finding personnel false break by effective means, ensure the safe and stable operation of a power grid, and develop a set of alarm system capable of automatically monitoring the dangerous electrified region of personnel false break in real time.
Disclosure of Invention
The invention aims at least solving the technical problems in the prior art, and particularly creatively provides an unattended alarm circuit of a transformer substation and a working method thereof.
In order to achieve the above purpose, the invention discloses an unattended alarm circuit of a transformer substation, which comprises one or more microwave induction switches, a charge-discharge input control module, a power module, a charge-discharge module and an alarm module, wherein the one or more microwave induction switches, the charge-discharge input control module, the power module, the charge-discharge module and the alarm module are arranged around an isolated transformer substation;
the signal output end of the microwave inductive switch is connected with the signal input end of the charge-discharge input control module, the signal output end of the charge-discharge input control module is connected with the control end of the power supply module, the power output end of the power supply module is respectively connected with the microwave inductive switch, the charge-discharge input control module and the charge-discharge module, the microwave inductive switch, the charge-discharge input control module and the charge-discharge module are respectively powered, the charge-discharge input control module controls the power supply module to supply power to the charge-discharge module according to the signal output by the microwave inductive switch, and the power output end of the charge-discharge module is connected with the alarm module.
In a preferred embodiment of the present invention, the charge-discharge input control module includes a triode VT2, a base electrode of the triode VT2 is connected to a signal output end of the microwave inductive switch, an emitter electrode of the triode VT2 is connected to a power output end of the power module, a collector electrode of the triode VT2 is connected to a first end of a resistor R3, and a second end of the resistor R3 is connected to a control end of the power module. When the base electrode of the triode VT2 is input at a high level, the triode VT2 is in a conducting state, and a control signal is sent to the power supply module, and the silicon controlled rectifier is in a conducting state at the moment; when the base electrode of the triode VT2 is input at a low level, the triode VT2 is in a cut-off state, and a control signal is not sent to the power supply module, and the thyristor is in the cut-off state at the moment.
In a preferred embodiment of the present invention, the microwave induction switch further comprises a delay circuit module, the delay circuit module comprises a triode VT1, a base electrode of the triode VT1 is connected with a first end of a resistor R1, a second end of the resistor R1 is connected with a signal output end of the microwave induction switch, an emitter electrode of the triode VT1 is connected with a grounding end of the power supply module, a collector electrode of the triode VT1 is respectively connected with a first end of an adjustable resistor R2, a sliding end of the adjustable resistor R2 and a first end of a capacitor C1, a second end of the capacitor C1 is connected with a power output end of the power supply module, and a second end of the adjustable resistor R2 is connected with a base electrode of the triode VT 2. When the base electrode of the triode VT1 is input at a high level, the triode VT1 is in a conducting state, the power supply module charges the capacitor C1, when the base electrode of the triode VT1 is input at a low level, the triode VT1 is in a cut-off state, the capacitor C1 discharges the base electrode of the triode VT2, and the conducting time of the triode VT2 is prolonged.
In a preferred embodiment of the present invention, the present invention further includes a period selection module, where the period selection module includes a triode VT3, a base electrode of the triode VT3 is connected to a first end of a resistor R4 and a first end of an adjustable resistor RP, a second end of the adjustable resistor RP and a sliding end of the adjustable resistor RP are connected to a ground end of the power module, a second end of the resistor R4 is connected to a first end of a photo resistor RL, a second end of the photo resistor RL is connected to a power output end of the power module, a collector electrode of the triode VT3 is connected to a control end of the power module, and an emitter electrode of the triode VT3 is connected to a ground end of the power module. When the light-sensitive resistor is in the daytime, the light-sensitive resistor is irradiated by sunlight to form a low resistance value, at the moment, the base electrode of the triode VT3 is input in a high level, the triode VT3 is in a conducting state, the signal output by the triode VT2 is shorted, and the silicon controlled rectifier VS is in a non-conducting state; when the light-sensitive resistor is at night, the light-sensitive resistor is high in resistance, the base electrode of the triode VT3 is input at low level, the triode VT3 is in a cut-off state, the signal output by the triode VT2 enables the silicon controlled rectifier VS to be in a conduction state, and in addition, the sensitivity of illumination intensity can be adjusted by adjusting the resistance of the adjustable resistor RP. The night alarm device can send out a light alarm to remind external personnel to keep away from the transformer substation; saving electric energy.
In a preferred embodiment of the present invention, the power supply module includes a mains supply, a live wire end of the mains supply is respectively connected to a first end of the capacitor C3 and a first end of the resistor R5, a second end of the capacitor C3 and a second end of the resistor R5 are respectively connected to an anode of the rectifier diode VD2 and a cathode of the zener diode VD1, the cathode of the rectifier diode VD2 is respectively connected to the first end of the capacitor C2, a power input end of the microwave inductive switch, a power input end of the charge-discharge input control module and a power input end of the charge-discharge module, a zero line end of the mains supply is respectively connected to an anode of the zener diode VD1, a second end of the capacitor C2, a first end of the thyristor, a ground end of the microwave inductive switch and a ground end of the charge-discharge input control module, and a second end of the thyristor is connected to a ground end of the charge-discharge module, and a control end of the thyristor is connected to a signal output end of the charge-discharge input control module. The commercial power AC220V is subjected to voltage reduction and current limiting through a capacitor C3, voltage stabilization through a voltage stabilizing diode VD1, rectification through a rectifying diode VD2 and capacitor C2 filtering, and then direct-current voltage adaptive to a microwave induction switch is output; in addition, when the silicon controlled rectifier is conducted, the same voltage is input to the charge-discharge module.
In a preferred embodiment of the present invention, the charge-discharge module includes a triode VT4, a base electrode of the triode VT4 is connected to a first end of a resistor R22 and a first end of a capacitor C11, a collector electrode of the triode VT4 is connected to a first end of an input loop of a relay J, a second end of the input loop of the relay J is connected to a first ground end of the power module, an emitter electrode of the triode VT4 is connected to a first end of a resistor R23 and a power output end of the power module, a second end of the resistor R23 is connected to a second end of the resistor R22 and a first end of a normally-closed contact of the relay J, a second end of the normally-closed contact of the relay J is connected to a first end of the resistor R21 and a power input end of the alarm module, and a second end of the resistor R21 is connected to a second end of the capacitor C11. When the controllable silicon VS is in a conducting state, a loop is formed by the resistor R23, the normally closed contact of the relay J and the LED lamp, the LED lamp is on, when the current passes through the resistor R23, voltage drop is generated on the resistor R23, the triode VT4 is conducted due to forward bias, and collector current of the triode VT4 passes through the input loop of the relay J, so that the normally closed contact of the relay J is immediately disconnected, and the LED lamp is extinguished. When the triode VT4 is conducted, the base electrode current of the triode VT4 charges the capacitor C11, and the current forms a charging loop by the emitter electrode of the triode VT4, the base electrode of the triode VT4, the capacitor C11, the resistor R21 and the LED; in the charging process, as the charge of the capacitor C11 is accumulated, the charging current is gradually reduced, the collector current of the triode VT4 is also reduced, and when the current is insufficient to maintain the attraction of the armature to release, the normally-closed contact of the relay J is closed again, so that the LED lamp is lighted. At this time, the capacitor C11 is discharged in a loop through the resistor R22, the normally closed contact of the relay J, and the resistor R21. The voltage drop generated by the discharge current on R22 provides reverse bias for the triode, and the accelerating triode VT4 is cut off; when the discharge current approaches zero, the voltage drop across resistor R23 provides a forward bias to transistor VT4 to turn it on. Therefore, the capacitor C11 is continuously charged and discharged, the triode VT4 is continuously switched on and off, and the normally-closed contact of the control relay is repeatedly switched off and closed, so that the LED lamp flashes.
In a preferred embodiment of the invention, the alarm module is one or more parallel LED lamps;
or/and the microwave induction switch is HB100 or TWH9250A.
In a preferred embodiment of the present invention, the power supply further comprises an audible alarm device, wherein a first end of the audible alarm device is connected with the power supply output end of the power supply module, and a second end of the audible alarm device is connected with the grounding end of the power supply module.
In a preferred embodiment of the present invention, the cloud server further comprises a first current detection unit connected to the collector of the triode VT2, and a second current detection unit connected to the collector of the triode VT3, wherein the current signal output end of the first current detection unit is connected to the first current input end of the controller, the current signal output end of the second current detection unit is connected to the second current input end of the controller, the network connection end of the controller is connected to the connection end of the network module, and the controller is connected to the cloud server through the network connection module.
The invention also discloses a working method of the unattended alarm circuit of the transformer substation, which comprises the following steps:
s1, a controller respectively sends current obtaining signals to a current first detection unit and a current second detection unit;
s2, judging whether the current value of the output end of the first current detection unit collected by the controller is larger than or equal to a preset first current threshold value:
if the current value of the output end of the current first detection unit collected by the controller is greater than or equal to a preset first current threshold value, a person enters a transformer substation area at the moment, an alarm device gives an alarm, and the moment when the person enters the transformer substation area is recorded as t1; an alarm is sent to remind the external personnel of paying attention to the danger nearby the transformer substation, and the transformer substation should be kept away.
If the current value of the output end of the current first detection unit collected by the controller is smaller than a preset first current threshold value, no personnel enter the transformer substation area at the moment, the alarm device stops alarming, and the moment when the personnel leave the transformer substation area is recorded as t2;
if t2-t1+t is greater than or equal to a preset first time threshold, wherein t is the charging time when the triode VT2 is conducted, or the controller detects that the current value of the output end of the first current detection unit collected by the controller is continuously greater than or equal to the preset first current threshold; sending the position of the transformer substation to a cloud server, and dispatching a worker to patrol the transformer substation; patrol of the transformer substation is enhanced, and foreign personnel stay nearby the transformer substation for a long time to be persuaded away, so that danger is avoided.
S3, judging whether the current value of the output end of the current second detection unit collected by the controller is larger than or equal to a preset second current threshold value:
if the current value of the output end of the current second detection unit collected by the controller is larger than or equal to a preset second current threshold value; then the current value of the output end of the second current detection unit is recorded in the daytime;
if the current value of the output end of the current second detection unit collected by the controller is smaller than a preset second current threshold value; then at night, recording the current value of the output end of the current second detection unit; the respective durations of day and night may be recorded.
If the current value of the output end of the second detection unit recorded in the daytime is smaller than a preset second current threshold value and the duration time is larger than or equal to a preset second time threshold value;
or if the current value of the output end of the second detection unit recorded at night is larger than or equal to a preset second current threshold value and the duration time is larger than or equal to a preset third time threshold value;
the substation location is sent to the cloud server and a staff is dispatched to check the substation. When overcast and rainy weather occurs in the daytime or Lei Shandian ringing occurs at night, workers are dispatched in time to check the safety of the transformer substation, and accidents are prevented.
In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows: the invention can alarm the personnel entering the transformer substation area, remind the personnel away from the transformer substation and prevent accidents.
Drawings
Fig. 1 is a schematic block diagram of the connection of the present invention.
Fig. 2 is a schematic diagram of the circuit connection of the present invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
The invention discloses an unattended alarm circuit of a transformer substation, which is shown in figure 1 and comprises one or more microwave induction switches, a charge-discharge input control module, a power supply module, a charge-discharge module and an alarm module, wherein the one or more microwave induction switches are arranged around an isolated transformer substation;
the signal output end of the microwave inductive switch is connected with the signal input end of the charge-discharge input control module, the signal output end of the charge-discharge input control module is connected with the control end of the power supply module, the power output end of the power supply module is respectively connected with the microwave inductive switch, the charge-discharge input control module and the charge-discharge module, the microwave inductive switch, the charge-discharge input control module and the charge-discharge module are respectively powered, the charge-discharge input control module controls the power supply module to supply power to the charge-discharge module according to the signal output by the microwave inductive switch, and the power output end of the charge-discharge module is connected with the alarm module.
In a preferred embodiment of the present invention, the charge-discharge input control module includes a triode VT2, a base electrode of the triode VT2 is connected to a signal output end of the microwave inductive switch, an emitter electrode of the triode VT2 is connected to a power output end of the power module, a collector electrode of the triode VT2 is connected to a first end of a resistor R3, and a second end of the resistor R3 is connected to a control end of the power module.
In a preferred embodiment of the present invention, the microwave induction switch further comprises a delay circuit module, the delay circuit module comprises a triode VT1, a base electrode of the triode VT1 is connected with a first end of a resistor R1, a second end of the resistor R1 is connected with a signal output end of the microwave induction switch, an emitter electrode of the triode VT1 is connected with a grounding end of the power supply module, a collector electrode of the triode VT1 is respectively connected with a first end of an adjustable resistor R2, a sliding end of the adjustable resistor R2 and a first end of a capacitor C1, a second end of the capacitor C1 is connected with a power output end of the power supply module, and a second end of the adjustable resistor R2 is connected with a base electrode of the triode VT 2.
In a preferred embodiment of the present invention, the present invention further includes a period selection module, where the period selection module includes a triode VT3, a base electrode of the triode VT3 is connected to a first end of a resistor R4 and a first end of an adjustable resistor RP, a second end of the adjustable resistor RP and a sliding end of the adjustable resistor RP are connected to a ground end of the power module, a second end of the resistor R4 is connected to a first end of a photo resistor RL, a second end of the photo resistor RL is connected to a power output end of the power module, a collector electrode of the triode VT3 is connected to a control end of the power module, and an emitter electrode of the triode VT3 is connected to a ground end of the power module.
In a preferred embodiment of the present invention, the power supply module includes a mains supply, a live wire end of the mains supply is respectively connected to a first end of the capacitor C3 and a first end of the resistor R5, a second end of the capacitor C3 and a second end of the resistor R5 are respectively connected to an anode of the rectifier diode VD2 and a cathode of the zener diode VD1, the cathode of the rectifier diode VD2 is respectively connected to the first end of the capacitor C2, a power input end of the microwave inductive switch, a power input end of the charge-discharge input control module and a power input end of the charge-discharge module, a zero line end of the mains supply is respectively connected to an anode of the zener diode VD1, a second end of the capacitor C2, a first end of the thyristor, a ground end of the microwave inductive switch and a ground end of the charge-discharge input control module, and a second end of the thyristor is connected to a ground end of the charge-discharge module, and a control end of the thyristor is connected to a signal output end of the charge-discharge input control module.
In a preferred embodiment of the present invention, the charge-discharge module includes a triode VT4, a base electrode of the triode VT4 is connected to a first end of a resistor R22 and a first end of a capacitor C11, a collector electrode of the triode VT4 is connected to a first end of an input loop of a relay J, a second end of the input loop of the relay J is connected to a first ground end of the power module, an emitter electrode of the triode VT4 is connected to a first end of a resistor R23 and a power output end of the power module, a second end of the resistor R23 is connected to a second end of the resistor R22 and a first end of a normally-closed contact of the relay J, a second end of the normally-closed contact of the relay J is connected to a first end of the resistor R21 and a power input end of the alarm module, and a second end of the resistor R21 is connected to a second end of the capacitor C11.
In a preferred embodiment of the invention, the alarm module is one or more parallel LED lamps.
In a preferred embodiment of the present invention, the power supply further comprises an audible alarm device, wherein a first end of the audible alarm device is connected with the power supply output end of the power supply module, and a second end of the audible alarm device is connected with the grounding end of the power supply module.
In this embodiment, the type of the microwave inductive switch U1 is not limited to HB100 or TWH9250A, but may be TX982, the resistance of the resistor R1 is 1K, the resistance of the adjustable resistor R2 is 200 uF, the resistance of the resistor R3 is 3 uF, the resistance of the resistor R4 is 30K, the resistance of the resistor R5 is 510K, the type of the photo resistor RL is MG44-05, the resistance of the adjustable resistor RP is 10K, the resistance of the resistor R21 is 5K, the resistance of the resistor R22 is 10K, the resistance of the resistor R23 is 15K, the types of the transistors VT1, VT2, VT3 and VT4 are C9014, the capacitance of the capacitor C1 is 47uF, the capacitance of the capacitor C2 is 220uF, the capacitance of the capacitor C3 is 0.47uF, the capacitance of the capacitor C11 is 4.7uF, the type of the controllable silicon VS is MAC94A4, the type of the rectifier diode 1N4 is VD1 to VD 5.
The specific circuit connection of the unattended alarm circuit of the transformer substation is as shown in fig. 2: the live wire end of the mains supply is respectively connected with the first end of a capacitor C3 and the first end of a resistor R5, the second end of the capacitor C3 and the second end of the resistor R5 are respectively connected with the anode of a rectifier diode VD2 and the cathode of a voltage stabilizing diode VD1, the cathode of the rectifier diode VD2 is respectively connected with the first end of the capacitor C2, the second end of a photoresistor RL, the emitter of a triode VT2, the second end of the capacitor C1, the positive end of a power supply of a microwave inductive switch and the positive end of a power supply of an alarm device, and the zero line end of the mains supply is respectively connected with the anode of the voltage stabilizing diode VD1, the second end of the capacitor C2, the first end of a silicon controlled rectifier, the grounding end of the microwave inductive switch, the emitter of the triode VT3, the emitter of the triode VT1, the sliding end of the adjustable resistor RP and the second end of the adjustable resistor RP.
The base of triode VT1 links to each other with resistance R1's first end, and resistance R1's second end links to each other with microwave inductive switch's signal output part, and triode VT 1's collecting electrode links to each other with adjustable resistance R2's first end, adjustable resistance R2's slip end and electric capacity C1's first end respectively, and adjustable resistance R2's second end links to each other with triode VT 2's base.
The collector of the triode VT2 is connected with the first end of a resistor R3, and the second end of the resistor R3 is connected with the control end of the controllable silicon VS and the collector of the triode V3 respectively.
The base of the triode VT3 is respectively connected with the first end of the resistor R4 and the first end of the adjustable resistor RP, and the second end of the resistor R4 is connected with the first end of the photoresistor RL.
The base of triode VT4 links to each other with resistance R22's first end and electric capacity C11's first end respectively, triode VT 4's collecting electrode links to each other with relay J input loop's first end, relay J input loop's second end links to each other with silicon controlled rectifier VS's second end respectively, alarm device's power negative terminal and LED lamp's first end, triode VT 4's projecting pole links to each other with resistance R23's first end and rectifier diode VD 2's negative pole respectively, resistance R23's second end links to each other with resistance R22's second end and relay J normally closed contact's first end respectively, relay J normally closed contact's second end links to each other with resistance R21's first end and LED lamp's second end respectively, resistance R21's second end links to each other with electric capacity C11's second end.
In a preferred embodiment of the present invention, the cloud server further comprises a first current detection unit connected to the collector of the triode VT2, and a second current detection unit connected to the collector of the triode VT3, wherein the current signal output end of the first current detection unit is connected to the first current input end of the controller, the current signal output end of the second current detection unit is connected to the second current input end of the controller, the network connection end of the controller is connected to the connection end of the network module, and the controller is connected to the cloud server through the network connection module. In this embodiment, the controller may be a single-chip microcomputer, the specific model may be H27UCG8T2ATR-BC, and the network connection module may be a GPRS module.
The invention also discloses a working method of the unattended alarm circuit of the transformer substation, which comprises the following steps:
the first step, the controller sends current obtaining signals to the current first detection unit and the current second detection unit respectively. In this embodiment, the current first detecting unit and the current second detecting unit may use a max471 chip, and specific circuit connections are not described herein, and reference may be made to a data manual.
Step two, judging whether the current value of the output end of the first current detection unit collected by the controller is larger than or equal to a preset first current threshold value:
if the current value of the output end of the first current detection unit collected by the controller is larger than or equal to a preset first current threshold value, a person enters a transformer substation area at the moment, an alarm device gives an alarm, and the moment when the person enters the transformer substation area is recorded to be t1.
If the current value of the output end of the first current detection unit collected by the controller is smaller than a preset first current threshold value, no personnel enter the transformer substation area at the moment, the alarm device stops alarming, and the moment when the personnel leave the transformer substation area is recorded to be t2.
If t2-t1+t is greater than or equal to a preset first time threshold, wherein t is the charging time when the triode VT2 is conducted, or the time when the controller detects that the current value of the output end of the first current detection unit collected by the controller is continuously greater than or equal to the preset first current threshold is 15-20 min; the substation location is sent to the cloud server and a worker is dispatched to patrol the substation. Wherein t=r 2 C 1 Ln[(V 1 -V 0 )/(V 1 -V t )]，V 0 For the initial voltage value on capacitor C1, V 1 Voltage value V for capacitor C1 to be charged or discharged finally t For the voltage value on the capacitor C1 at time t, R 2 Is the resistance value of the resistor R2, C 1 Is the capacitance of the capacitor C1. In this embodiment, the first time threshold is preset to be 5 to 10 minutes.
Third, judging whether the current value of the output end of the current second detection unit collected by the controller is larger than or equal to a preset second current threshold value:
if the current value of the output end of the current second detection unit collected by the controller is larger than or equal to a preset second current threshold value; then the current value at the output of the second current detecting unit is recorded during the daytime. In the present embodiment, the preset first current threshold value=the preset second current threshold value= (VCC-1.5)/R 3 ，V CC For the voltage value output by the power supply module, R 3 Is the resistance of the resistor R3.
If the current value of the output end of the current second detection unit collected by the controller is smaller than a preset second current threshold value; then at night, the current value of the output end of the second current detection unit is recorded.
If the current value of the output end of the second detection unit recorded in the daytime is smaller than a preset second current threshold value and the duration time is larger than or equal to a preset second time threshold value.
Or if the current value of the output end of the second detection unit recorded at night is larger than or equal to a preset second current threshold value and the duration time is larger than or equal to a preset third time threshold value. In this embodiment, the preset second time threshold may be 1.5 to 2.5 hours, and the preset third time threshold may be 0.5 to 1.0 hour.
The substation location is sent to the cloud server and a staff is dispatched to check the substation. While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
Claims (8)
1. The unattended alarm circuit of the transformer substation is characterized by comprising one or more microwave induction switches, a charge-discharge input control module, a power supply module, a charge-discharge module and an alarm module, wherein the one or more microwave induction switches, the charge-discharge input control module, the power supply module, the charge-discharge module and the alarm module are arranged around an isolated transformer substation;
the signal output end of the microwave induction switch is connected with the signal input end of the charge-discharge input control module, the signal output end of the charge-discharge input control module is connected with the control end of the power supply module, the power output end of the power supply module is respectively connected with the microwave induction switch, the charge-discharge input control module and the charge-discharge module, the microwave induction switch, the charge-discharge input control module and the charge-discharge module are respectively powered, the charge-discharge input control module controls the power supply module to supply power to the charge-discharge module according to the signal output by the microwave induction switch, and the power output end of the charge-discharge module is connected with the alarm module;
the charge-discharge input control module comprises a triode VT2, the base electrode of the triode VT2 is connected with the signal output end of the microwave inductive switch, the emitting electrode of the triode VT2 is connected with the power output end of the power supply module, the collecting electrode of the triode VT2 is connected with the first end of a resistor R3, and the second end of the resistor R3 is connected with the control end of the power supply module;
the time delay circuit module comprises a triode VT1, wherein the base electrode of the triode VT1 is connected with the first end of a resistor R1, the second end of the resistor R1 is connected with the signal output end of the microwave inductive switch, the emitter electrode of the triode VT1 is connected with the grounding end of the power supply module, the collector electrode of the triode VT1 is respectively connected with the first end of an adjustable resistor R2, the sliding end of the adjustable resistor R2 and the first end of a capacitor C1, the second end of the capacitor C1 is connected with the power supply output end of the power supply module, and the second end of the adjustable resistor R2 is connected with the base electrode of the triode VT 2;
the time period selection module comprises a triode VT3, the base electrode of the triode VT3 is respectively connected with the first end of a resistor R4 and the first end of an adjustable resistor RP, the second end of the adjustable resistor RP and the sliding end of the adjustable resistor RP are respectively connected with the grounding end of the power supply module, the second end of the resistor R4 is connected with the first end of a photoresistor RL, the second end of the photoresistor RL is connected with the power supply output end of the power supply module, the collector electrode of the triode VT3 is connected with the control end of the power supply module, and the emitter electrode of the triode VT3 is connected with the grounding end of the power supply module.
2. The unattended alarm circuit of a transformer substation according to claim 1, wherein the power supply module comprises a mains supply, a live wire end of the mains supply is respectively connected with a first end of a capacitor C3 and a first end of a resistor R5, a second end of the capacitor C3 and a second end of the resistor R5 are respectively connected with an anode of a rectifier diode VD2 and a cathode of a voltage stabilizing diode VD1, the cathode of the rectifier diode VD2 is respectively connected with the first end of the capacitor C2, a power supply input end of a microwave induction switch, a power supply input end of a charge-discharge input control module and a power supply input end of the charge-discharge module, a zero line end of the mains supply is respectively connected with an anode of the voltage stabilizing diode VD1, a second end of the capacitor C2, a first end of a silicon controlled rectifier, a grounding end of the microwave induction switch and a grounding end of the charge-discharge input control module, and a control end of the silicon controlled rectifier is connected with a signal output end of the charge-discharge input control module.
3. The unattended alarm circuit of a transformer substation according to claim 1, wherein the charge-discharge module comprises a triode VT4, a base electrode of the triode VT4 is connected with a first end of a resistor R22 and a first end of a capacitor C11 respectively, a collector electrode of the triode VT4 is connected with a first end of a relay J input loop, a second end of the relay J input loop is connected with a first grounding end of the power module, an emitter electrode of the triode VT4 is connected with a first end of a resistor R23 and a power output end of the power module respectively, a second end of the resistor R23 is connected with a second end of the resistor R22 and a first end of a normally-closed contact of the relay J respectively, a second end of the normally-closed contact of the relay J is connected with a first end of the resistor R21 and a power input end of the alarm module respectively, and a second end of the resistor R21 is connected with a second end of the capacitor C11.
4. The unattended alarm circuit of a substation according to claim 1 wherein the alarm module is one or more parallel LED lamps.
5. The unattended alarm circuit of a substation according to claim 1, wherein the microwave inductive switch is of a type HB100 or TWH9250A.
6. The unattended alarm circuit of the transformer substation according to claim 1 further comprising an audible alarm device, wherein a first end of the audible alarm device is connected to a power output end of the power module, and a second end of the audible alarm device is connected to a ground end of the charge-discharge module.
7. The unattended alarm circuit of a transformer substation according to one of claims 1 to 6, further comprising a first current detection unit connected to a collector of the triode VT2 and a second current detection unit connected to a collector of the triode VT3, wherein a current signal output end of the first current detection unit is connected to a first current input end of the controller, a current signal output end of the second current detection unit is connected to a second current input end of the controller, a network connection end of the controller is connected to a connection end of the network module, and the controller is connected to the cloud server through the network connection module.
8. The method of operating an unattended alarm circuit of a substation according to claim 7, comprising the steps of:
s1, a controller respectively sends current obtaining signals to a current first detection unit and a current second detection unit;
s2, judging whether the current value of the output end of the first current detection unit collected by the controller is larger than or equal to a preset first current threshold value:
if the current value of the output end of the current first detection unit collected by the controller is greater than or equal to a preset first current threshold value, a person enters a transformer substation area at the moment, an alarm device gives an alarm, and the moment when the person enters the transformer substation area is recorded as t1;
if the current value of the output end of the current first detection unit collected by the controller is smaller than a preset first current threshold value, no personnel enter the transformer substation area at the moment, the alarm device stops alarming, and the moment when the personnel leave the transformer substation area is recorded as t2;
if t2-t1+t is greater than or equal to a preset first time threshold, wherein t is the charging time when the triode VT2 is conducted, or the controller detects that the current value of the output end of the first current detection unit collected by the controller is continuously greater than or equal to the preset first current threshold; sending the position of the transformer substation to a cloud server, and dispatching a worker to patrol the transformer substation;
s3, judging whether the current value of the output end of the current second detection unit collected by the controller is larger than or equal to a preset second current threshold value:
if the current value of the output end of the current second detection unit collected by the controller is larger than or equal to a preset second current threshold value; then the current value of the output end of the second current detection unit is recorded in the daytime;
if the current value of the output end of the current second detection unit collected by the controller is smaller than a preset second current threshold value; then at night, recording the current value of the output end of the current second detection unit;
if the current value of the output end of the second detection unit recorded in the daytime is smaller than a preset second current threshold value and the duration time is larger than or equal to a preset second time threshold value;
or if the current value of the output end of the second detection unit recorded at night is larger than or equal to a preset second current threshold value and the duration time is larger than or equal to a preset third time threshold value;
the controller sends the substation location to the cloud server and sends a staff to check the substation.
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| CN204291450U (en) * | 2014-11-15 | 2015-04-22 | 广东良得光电科技有限公司 | A kind of leading microwave sensing LED switch control circuit |
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| CN205655933U (en) * | 2016-05-24 | 2016-10-19 | 江苏亿莱顿智能科技有限公司 | Intelligent transformer substation |
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| CN202475896U (en) * | 2012-03-15 | 2012-10-03 | 商丘市电业局永城分局 | Intelligent lamp applicable to inspection of transformer substation |
| CN104751583A (en) * | 2015-03-13 | 2015-07-01 | 国家电网公司 | Nighttime anti-theft device of transformer substation |
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