CN217984504U - Reverse power transmission risk prevention equipment - Google Patents
Reverse power transmission risk prevention equipment Download PDFInfo
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- CN217984504U CN217984504U CN202222032566.5U CN202222032566U CN217984504U CN 217984504 U CN217984504 U CN 217984504U CN 202222032566 U CN202222032566 U CN 202222032566U CN 217984504 U CN217984504 U CN 217984504U
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Abstract
The utility model relates to a counter-power transmission risk prevention device, which comprises a voltage sensor, a time-delay tripping circuit breaker and a locking device; the voltage sensor is used for sensing the voltage of the main power supply circuit; the time delay tripping circuit breaker is arranged on the main power supply circuit and used for disconnecting a loop of the main power supply circuit and a load when the voltage of the main power supply circuit is in long-term voltage loss or long-term undervoltage; the latch is used for locking the time delay tripping circuit breaker in an off state after the time delay tripping circuit breaker is switched off. The method can reduce the risk of reverse power transmission from a multi-power-supply user to the power grid side.
Description
Technical Field
The utility model relates to a field is guard against to anti-power transmission risk, concretely relates to equipment is guard against to anti-power transmission risk.
Background
In order to improve the power supply reliability, a power user supplies power by using double power supplies or double loops, or a self-contained emergency power supply is arranged on the user side, so that the problems of the source and the safety risk of the reverse power transmission become more and more complex, and the safety of distribution network operating personnel and equipment is endangered.
Patent document CN110165786A discloses an intelligent low-voltage photovoltaic anti-reverse power transmission monitoring control system, wherein a public network enters an indoor distribution box at a user end through a metering cabinet of a power supply company, and the indoor distribution box is communicated with internal loads of users; the system mainly comprises an operating mechanism and a control mechanism, wherein the photovoltaic power station and an inverter are connected with a user side power generation metering box through an alternating current grid-connected switch, photovoltaic power generation is connected into an indoor power distribution box through a power generation metering electric energy meter to directly supply power to internal loads of users or transmit electric energy to a public network side; the operation mechanism is arranged in the metering cabinet of the power supply company, is used for cutting off and closing the connection between the public network and the user side, and consists of an operation unit, a motor and a switch, wherein the operation unit receives a switching-off and switching-on signal and controls the motor to act, and the motor controls the switch to be switched on and off so as to cut off and close the connection between the public network and the user side; the control mechanism consists of a voltage monitoring unit, a control unit and a communication module and is arranged on the public network side; the voltage monitoring unit of the control mechanism and the operation unit of the operation mechanism are connected with each other to realize switching-on and switching-off signal transmission; the voltage monitoring unit monitors the voltage of the public network in real time and outputs a signal to the control unit, and the control unit analyzes the voltage acquired by the voltage monitoring unit and sends a control signal to the operation unit so as to realize the opening or closing of the switch; the control unit collects switch action signals and transmits the switch action signals to the communication module, and the communication module sends switch state information to operation and maintenance personnel immediately. This technical scheme is applicable to the emergent processing of opening circuit after taking place the reverse power transmission, can not realize the reverse power transmission risk and take precautions against.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a reverse power transmission risk precaution method, reverse power transmission risk precaution equipment to reduce the reverse power transmission risk of many power users to the electric wire netting side.
The technical scheme of the utility model is that:
a reverse power transmission risk prevention device comprises a voltage sensor, a time delay tripping circuit breaker and a locking device; the voltage sensor is used for sensing the voltage of the main power supply circuit; the time delay tripping circuit breaker is used for being installed on the main power supply circuit and is used for disconnecting a loop of the main power supply circuit and a load when the voltage of the main power supply circuit is in long-term voltage loss or long-term undervoltage; the latch is used for locking the time delay tripping circuit breaker in an off state after the time delay tripping circuit breaker is switched off.
Preferably, the voltage sensor includes a voltage sensor, the time-delay tripping circuit breaker includes a control processor and a main circuit control switch, an output end of the voltage sensor is electrically connected with an input end of the control processor, and an output end of the control processor is electrically connected with a control end of the main circuit control switch.
Preferably, the system further comprises an auxiliary circuit control switch, and the output end of the control processor is electrically connected with the control end of the auxiliary circuit control switch.
Preferably, the locking device includes an and gate circuit, the main circuit control switch is an NPN-type control switch, two output ends of the control processor are respectively configured as a switch control end and a locking control end, the switch control end and the locking control end are respectively electrically connected to an input end of the and gate circuit, and an output end of the and gate circuit is electrically connected to a control end of the control switch.
Preferably, the latch includes a nand gate circuit, the main circuit control switch is a PNP type control switch, two output terminals of the control processor are respectively configured as a switch control terminal and a latch control terminal, the switch control terminal and the latch control terminal are respectively electrically connected to an input terminal of the nand gate circuit, and an output terminal of the nand gate circuit is electrically connected to a control terminal of the control switch.
Preferably, the locking device comprises a shell, an electromagnet, a locking rod and a reset piece, the locking rod is connected with the shell in a sliding mode, a soft magnetic sheet is fixed on the locking rod, the electromagnet is arranged at one end of the shell and used for being matched with the soft magnetic sheet to drive the locking rod to move, and the reset piece is used for resetting the locking rod.
The beneficial effects of the utility model are that:
1. the voltage sensor and the time delay tripping circuit breaker are matched, so that the problem of mistaken tripping of a main circuit control switch caused by instantaneous fluctuation and flicker of the voltage of a power grid can be avoided. After the time delay tripping circuit breaker trips, the locking device locks the time delay tripping circuit breaker in a disconnected state, and the reverse power transmission risk caused by the time delay tripping circuit breaker which is switched on by mistake can be avoided.
2. When the auxiliary power supply is used, the auxiliary circuit control switch is installed on an auxiliary power supply circuit between the standby power supply and a load, the output end of the control processor is also electrically connected with the control end of the auxiliary circuit control switch, and the auxiliary power supply circuit can be disconnected by means of the control processor and the auxiliary circuit control switch.
3. The locking device comprises an AND gate circuit, the main circuit control switch is an NPN control switch, and the control processor, the AND gate circuit and the main circuit control switch can form an electric locking device, so that the locking device is simple in structure and small in occupied space.
4. The latch comprises a NAND gate circuit, the main circuit control switch is a PNP type control switch control processor, the NAND gate circuit and the main circuit control switch can form an electric latch, and the latch is simple in structure and small in occupied space.
5. When the locking device comprises a shell, an electromagnet, a locking rod and a reset piece, mechanical locking can be realized, and the locking effect of the locking device is stronger than that of electric locking.
Drawings
Fig. 1 is a circuit diagram of a reverse power transmission risk prevention apparatus;
fig. 2 is a second circuit diagram of a reverse power transmission risk prevention apparatus;
fig. 3 is a third circuit diagram of a reverse power transmission risk prevention apparatus.
Fig. 4 is a circuit diagram of another reverse power transmission risk prevention apparatus;
fig. 5 is a second circuit diagram of another apparatus for preventing a power return risk.
Fig. 6 is a structural diagram of a latch of the reverse power transmission risk prevention device.
The reference number indicates 1-shell, 2-locking rod, 21-soft magnetic sheet, 3-electromagnet, 4-reset piece.
Detailed Description
The present invention is described below in terms of embodiments with reference to the accompanying drawings to assist those skilled in the art in understanding and realizing the invention. Unless otherwise indicated, the following embodiments and technical terms therein should not be understood to depart from the background of the technical knowledge in the technical field.
Example 1: a reverse power transmission risk prevention device, see fig. 1-3, includes a voltage sensor, a time delay trip circuit breaker, and a latch.
In this embodiment, the time-delay tripping circuit breaker includes a control processor and a main circuit control switch, and the output end of the control processor is electrically connected with the control end of the main circuit control switch.
In the embodiment, the control processor selects a single chip microcomputer with an internal analog-to-digital converter, the model selects an STM8S105 single chip microcomputer, and pins 18-22 of the single chip microcomputer are multiplexed into ADC functional pins. In other embodiments, the control processor may also select a PLC, an industrial personal computer, or the like.
In this embodiment, the voltage sensor includes a voltage sensor, a voltage sampling circuit, and an analog-to-digital converter, where an output end of the voltage sensor is electrically connected to an input end of the voltage sampling circuit, an output end of the voltage sampling circuit is electrically connected to an analog input end of the analog-to-digital converter, and a digital output end of the analog-to-digital converter is electrically connected to an input end of the control processor. In this embodiment, the voltage sensor selects the voltage transformer PT1, and in other embodiments, the voltage sensor may also select a varistor or the like.
In this embodiment, the main control switch is an NPN type control switch, so that the control processor and the and gate are matched to realize the function of the latch. I.e., its pin 42 outputs a low signal corresponding to the main control switch blocking signal and its pin 42 outputs a high signal corresponding to the main control switch unblocking signal. Its pin 41 outputs a low level signal corresponding to the main control switch off signal, and its pin 41 outputs a high level signal corresponding to the main control switch on signal.
In this embodiment, the main control switch selects the contactor KM1, and the auxiliary contact thereof may output a main control switch off-state signal.
When the time delay tripping circuit breaker is used, the time delay tripping circuit breaker is arranged between a main power supply circuit and a load, and a voltage sensor is arranged on the main power supply circuit. Disconnecting the main power supply circuit and a loop of the load when the main power supply circuit is in long-term voltage loss or under-voltage; the latch locks the time delay trip circuit breaker in an open state after the time delay trip circuit breaker is opened. Long term loss of pressure is generally referred to as loss of pressure. The long under-voltage refers to an under-voltage lasting for 1-5 s, and generally, the under-voltage is considered when the voltage is lower than 75% of the rated voltage.
In this embodiment, when the main power supply voltage is lost or undervoltage for 2 seconds, the pin 41 of the control processor outputs a low level signal, the pin 42 outputs a low level signal, the and & output signal a31 is a low level signal, the signal a31 drives the load end of the switch Q301 to be disconnected, the coil of the contactor KM1 is powered off, the load end of the contactor KM1 is disconnected, and the disconnection of the main control switch is realized. Since the pin 42 outputs a low level signal, even if the pin 41 outputs a high level signal, the and & output signal a31 is a low level signal, and the purpose of locking the main circuit control switch in the off state is achieved. When the duration of the main power supply voltage is 2 seconds and the rated voltage is recovered, the pin 42 of the control processor outputs a high level signal, at this time, the pin 41 of the control processor outputs a low level signal, the coil of the contactor KM1 is powered off, the load end of the contactor KM1 is disconnected, the pin 41 of the control processor outputs a high level signal, the coil of the contactor KM1 is electrified, and the load end of the contactor KM1 is switched on.
Referring to fig. 1-3, in this embodiment, the reverse power transmission risk prevention device further includes an auxiliary circuit control switch KM2, and after the auxiliary circuit control switch KM2 is added, the function of simultaneously turning off the auxiliary circuit control switch and turning on the main circuit control switch, or turning on the main circuit control switch in time after turning off the auxiliary circuit control switch, can be realized. When the main circuit control switch is unlocked, the control processor pin 42 outputs a low level, namely the auxiliary circuit control switch is disconnected, and simultaneously or later, the control processor pin 41 outputs a high level, namely the main circuit control switch is switched on.
In combination with the common knowledge in the field, the main circuit control switch is a PNP type control switch, so that the control processor and the NAND gate are matched to realize the function of the latch. I.e., pin 42 outputs a high signal corresponding to the main control switch lock signal and pin 42 outputs a low signal corresponding to the main control switch unlock signal. Its pin 41 outputs a high level signal corresponding to a main control switch off signal, and its pin 41 outputs a low level signal corresponding to a main control switch on signal.
Example 2: a reverse power transmission risk prevention device, see fig. 1, 4-6, includes a voltage sensor, a time delay trip circuit breaker, and a latch.
In this embodiment, the time delay trip circuit breaker includes a control processor and a main circuit control switch, and an output terminal of the control processor is electrically connected to a control terminal of the main circuit control switch.
In the embodiment, the control processor selects a singlechip with an internal analog-to-digital converter, the model selects an STM8S105 singlechip, and pins 18-22 of the singlechip are multiplexed as ADC (analog-to-digital converter) functional pins. In other embodiments, the control processor may also select a PLC, an industrial personal computer, or the like.
In this embodiment, the voltage sensor includes a voltage sensor, a voltage sampling circuit, and an analog-to-digital converter, where an output end of the voltage sensor is electrically connected to an input end of the voltage sampling circuit, an output end of the voltage sampling circuit is electrically connected to an analog input end of the analog-to-digital converter, and a digital output end of the analog-to-digital converter is electrically connected to an input end of the control processor. In this embodiment, the voltage sensor selects the voltage transformer PT1, and in other embodiments, the voltage sensor may also select a varistor or the like.
Referring to fig. 6, in the present embodiment, the locking device includes a housing 1, an electromagnet 3, a locking rod 2 and a reset member 4, the locking rod 2 is movably connected to the housing 1, and a soft magnetic plate 21 is fixed on the locking rod 2, in the present embodiment, the reset member 4 selects a compression spring, so that the electromagnet 3 and the reset member 4 are disposed on the same side of the soft magnetic plate 21, and if the reset member 4 selects a tension spring, the electromagnet 3 and the reset member 4 are disposed on both sides of the soft magnetic plate 21. When the electromagnet 3 is electrified, the soft magnetic sheet 21 is attracted to drive the locking rod 2 to get close to the electromagnet by overcoming the pulling force of the reset piece 4, and the locking rod 2 retracts. After the electromagnet 3 is powered off, the soft magnetic sheet 21 is demagnetized rapidly, the reset piece 4 drives the locking rod 2 and the soft magnetic piece 21 to reset, and the locking rod 2 extends out. When the locking device is used, the locking device is fixedly connected with the main circuit control switch, the disconnection or closing action of the main circuit control switch is not influenced when the locking rod 2 retracts, and the main circuit control switch is prevented from being switched to a closing state when the locking rod 2 extends out.
When the main circuit control switch is used, when the main power supply voltage is in voltage loss or undervoltage for 2 seconds, the pin 41 of the control processor outputs a low level signal, the signal A31 drives the load end of the switch Q301 to be disconnected, the coil of the contactor KM1 is powered off, the load end of the contactor KM1 is disconnected, and the main circuit control switch is disconnected. After the load end of the contactor KM1 is disconnected, the circuit output EN22 corresponding to the auxiliary contact is a high-level signal, the pin 43 of the control processor outputs a low-level signal, the load end of the switch Q321 is disconnected, the coil of the contactor KM3 is disconnected, the load end of the contactor KM3 is disconnected, the electromagnet 3 is disconnected, the locking rod 2 extends out, and the purpose of locking the main circuit control switch in a disconnected state is achieved. When the main power supply voltage is recovered to the rated voltage for 2 seconds, the pin 43 of the control processor outputs a high-level signal, the load end of the switch Q321 is closed, the coil of the contactor KM3 is electrified, the load end of the contactor KM3 is closed, the electromagnet 3 is electrified, and the locking rod 2 retracts, so that the purpose of unlocking the main control switch is achieved.
Referring to fig. 1, 4-5, in this embodiment, the reverse power transmission risk prevention device further includes an auxiliary circuit control switch KM2, and after the auxiliary circuit control switch KM2 is added, the function of simultaneously turning off the auxiliary circuit control switch and turning on the main circuit control switch, or turning on the main circuit control switch in time after turning off the auxiliary circuit control switch can be realized. When the main circuit control switch is unlocked, the control processor pin 42 outputs a low level, namely the auxiliary circuit control switch is disconnected, and simultaneously or later, the control processor pin 41 outputs a high level, namely the main circuit control switch is switched on.
The present invention has been described in detail with reference to the accompanying drawings and examples. It should be understood that in practice the description of all possible embodiments is not exhaustive and that the inventive concepts are presented herein by way of illustration as much as possible. Without departing from the inventive concept of the present invention and without paying creative labor, technical personnel in the technical field can make up the technical features in the above embodiments, make experimental changes of specific parameters, or use the prior art in the technical field to the specific embodiments of the present invention that the disclosed technical means are formed by conventional replacement, all belong to the content of the present invention.
Claims (6)
1. The reverse power transmission risk prevention equipment is characterized by comprising a voltage sensor, a time delay tripping circuit breaker and a locking device; the voltage sensor is used for sensing the voltage of the main power supply circuit; the time delay tripping circuit breaker is arranged on the main power supply circuit and used for disconnecting a loop of the main power supply circuit and a load when the voltage of the main power supply circuit is in long-term voltage loss or long-term undervoltage; the latch is used for locking the time delay tripping circuit breaker in an off state after the time delay tripping circuit breaker is switched off.
2. The reverse power transmission risk prevention device of claim 1, wherein the voltage sensor comprises a voltage sensor, the time delay trip breaker comprises a control processor and a main circuit control switch, an output of the voltage sensor is electrically connected with an input of the control processor, and an output of the control processor is electrically connected with a control terminal of the main circuit control switch.
3. The reverse power transmission risk prevention device according to claim 2, further comprising an auxiliary circuit control switch, wherein the output terminal of the control processor is further electrically connected to a control terminal of the auxiliary circuit control switch.
4. The reverse power transmission risk prevention device according to claim 2, wherein the latch includes an and gate circuit, the main control switch is an NPN-type control switch, two output terminals of the control processor are respectively configured as a switch control terminal and a latch control terminal, the switch control terminal and the latch control terminal are respectively electrically connected to an input terminal of the and gate circuit, and an output terminal of the and gate circuit is electrically connected to a control terminal of the main control switch.
5. The reverse power transmission risk prevention device according to claim 2, wherein the latch includes a nand gate circuit, the main circuit control switch is a PNP type control switch, two output terminals of the control processor are respectively configured as a switch control terminal and a latch control terminal, the switch control terminal and the latch control terminal are respectively electrically connected to an input terminal of the nand gate circuit, and an output terminal of the nand gate circuit is electrically connected to a control terminal of the main circuit control switch.
6. The reverse power transmission risk prevention device according to claim 2, wherein the locking device comprises a housing, an electromagnet, a locking rod and a reset piece, the locking rod is slidably connected with the housing, a soft magnetic sheet is fixed on the locking rod, the electromagnet is arranged at one end of the housing and used for being matched with the soft magnetic sheet to drive the locking rod to move, and the reset piece is used for resetting the locking rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222032566.5U CN217984504U (en) | 2022-08-03 | 2022-08-03 | Reverse power transmission risk prevention equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222032566.5U CN217984504U (en) | 2022-08-03 | 2022-08-03 | Reverse power transmission risk prevention equipment |
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| Publication Number | Publication Date |
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| CN217984504U true CN217984504U (en) | 2022-12-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202222032566.5U Active CN217984504U (en) | 2022-08-03 | 2022-08-03 | Reverse power transmission risk prevention equipment |
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| CN (1) | CN217984504U (en) |
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- 2022-08-03 CN CN202222032566.5U patent/CN217984504U/en active Active
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