CN112803351A - Combined residual voltage detection protection device - Google Patents
Combined residual voltage detection protection device Download PDFInfo
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- CN112803351A CN112803351A CN202011638746.7A CN202011638746A CN112803351A CN 112803351 A CN112803351 A CN 112803351A CN 202011638746 A CN202011638746 A CN 202011638746A CN 112803351 A CN112803351 A CN 112803351A
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- protection device
- residual voltage
- circuit
- voltage detection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2503—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques for measuring voltage only, e.g. digital volt meters (DVM's)
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- General Physics & Mathematics (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention relates to the field of power line protection, in particular to a combined residual voltage detection and protection device which comprises a residual voltage detection circuit, a voltage and current analog quantity acquisition circuit, a key module, a power module, a microprocessor module, a display screen module, a network communication interface module, a storage module, a remote signaling input interface and a control output interface, wherein the key module is used for receiving a control signal from the microprocessor module; the residual voltage detection circuit is connected with the I/O of the microprocessor module, the control output interface is connected with the output port of the processor, and the voltage and current sensor analog quantity acquisition circuit is connected with the AD circuit of the microprocessor module; the output end of the key module is connected with the input end I/O of the microprocessor module; the output end of the power supply module is connected with the corresponding power supply port of the microprocessor module; the input end of the display screen module is connected with the I/O of the output end of the microprocessor module. The device effectively improves the power grid reorganization and self-healing efficiency, reduces the power grid network reorganization time, and greatly enhances the power supply reliability of the power grid.
Description
Technical Field
The invention relates to the field of power line protection, in particular to a combined residual voltage detection and protection device.
Background
With the continuous investment and development of the state on the smart grid, the self-healing function requirement on the smart grid is higher, how to reduce the action times in the process of re-networking after a grid accident, and the requirement of self-healing in the fastest time is met, so that the power supply reliability is effectively improved, and the power supply quality is improved more urgently. The effective judgment of the residual voltage in the power grid network recombination process can shorten half of the network recombination time, but the residual voltage time is short, the time is required for restarting a general protection device under the condition of power failure, particularly, in order to realize that the protection device is maintenance-free for the whole life, a backup power supply adopts a super capacitor, but the super capacitor has the advantages of long service life and high instantaneous output power compared with a storage battery, but the power density is relatively low, the backup power supply has short maintenance time under the condition of no external power supply, the power failure is often caused in the network recombination process, at the moment, the effective judgment of the residual voltage becomes a difficulty, and the residual voltage is often judged to be not started by a control device, so that the residual voltage judgment is lost.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the combined residual voltage detection and protection device, which effectively improves the power grid reorganization and self-healing efficiency, reduces the power grid network reorganization time and greatly enhances the power supply reliability of the power grid.
The technical purpose is achieved, the technical effect is achieved, and the invention is realized through the following technical scheme:
a combined residual voltage detection protection device comprises a residual voltage detection circuit, a voltage and current analog quantity acquisition circuit, a key module, a power supply module, a microprocessor module, a display screen module, a network communication interface module, a storage module, a remote signaling input interface and a control output interface; the residual voltage detection circuit is connected with the I/O of the microprocessor module, the control output interface is connected with the output port of the processor, and the analog quantity acquisition circuit of the voltage and current sensor is connected with the AD circuit of the microprocessor module; the output end of the key module is connected with the input end I/O of the microprocessor module; the output end of the power supply module is connected with the corresponding power supply port of the microprocessor module; the input end of the display screen module is connected with the I/O of the output end of the microprocessor module; the network communication interface module is connected with the communication interface of the microprocessor module; the input end of the storage module is connected with the I/O of the output end of the microprocessor module, the remote signaling input interface is connected with the I/O of the input end of the microprocessor module, and the control output interface is connected with the I/O of the output end of the microprocessor module.
Further, the residual voltage detection circuit comprises a bistable relay, and the bistable relay adopts HFD 2.
Furthermore, the voltage and current analog quantity acquisition circuit comprises a voltage transformer and a current transformer, wherein the voltage transformer adopts a TR1176-3CH transformer, the current transformer adopts a TR211R1-1C transformer, and the AD circuit adopts AD 7606.
Further, the key module adopts a 4X4 keyboard; the display screen module adopts an HF12864 lattice type LCD display screen.
Further, the power module is also provided with a backup power supply, the backup power supply adopts a NBC300-220D27 super capacitor management module, and the super capacitor management module adopts a TBC2835 super capacitor group.
Further, the microprocessor module adopts an STM32F407 microprocessor.
Furthermore, the RS232 communication interface module adopts an RS232 chip with isolation; the network communication interface module adopts a W5500 network module; the wireless communication module adopts an INDTU331LH00-232-DS module.
Furthermore, the remote signaling input interface adopts optical coupling isolation type remote signaling quantity input.
Further, the control output interface adopts 942H-1A-12DS relay to isolate output.
The invention also provides a combined residual voltage detection protection method, which adopts the protection device, under the condition that the protection device is not electrified, a residual voltage detection circuit of the protection device is adopted to detect residual voltage pulses of an input side PT and an output side PT, if the input side PT has the residual voltage pulses, a first bistable relay K1 triggers suction, which indicates that an instantaneous fault occurs at the input side of the circuit, if the input side circuit is normally restored to supply power, the protection device restores the power supply, at the moment, the protection device can detect a residual voltage relay closing signal at the input side through a remote communication input port, and detect that the input side PT voltage is normal through a voltage sensor, the protection device judges that the circuit is normally supplied with power, a control switch is normally powered on and closed, if the output side circuit is restored to supply power, the protection device restores the power supply, at the moment, the residual voltage relay closing signal at the input, however, the voltage sensor detects that the input side PT is non-electrified, the output side PT is normal, the protection device judges that the input side of the circuit has faults and is not recovered, the protection device can be locked, and the switch is prevented from being switched to have faults; if the protection device is in a non-power condition, such as residual voltage pulse at the output side PT, the second bistable relay K2 triggers pull-in, which indicates that transient fault occurs at the output side of the line, if the power supply of the output side circuit is normally recovered, the protection device recovers the power supply, at the moment, the protection device can detect the closing signal of the residual voltage relay at the output side through the remote signaling input port, and the voltage sensor detects that the PT voltage at the output side is normal, the protection device judges that the line supplies power normally, the control switch is normally powered on and switched on, if the input side line recovers power supply, the protection device recovers power supply, at the moment, the protection device can detect the closing signal of the residual voltage relay at the output side through the remote signaling input port, however, the output side PT is powerless, the input side PT is normal, the protection device judges that the output side of the circuit fails and is not recovered, the protection device can be locked, and the switch is prevented from being switched to fail; under the condition that the PT on both sides of the protection device is in voltage loss, the residual voltage signal clearing signal pin is controlled to clear states of the first bistable relay K1 and the first bistable relay K2, and residual voltage pulse detection under the condition that the protection device is not electrified next time is waited.
Advantageous effects
The invention adopts combined residual voltage detection, which can effectively solve the problem, a special residual voltage detection circuit for double-sided PT is additionally arranged on hardware through a PT voltage transformer except for normal voltage analog signal detection, a bistable relay is adopted as a residual voltage memory circuit, the circuit can effectively record residual voltage pulse signals for more than 20ms under the condition that a protection device is not electrified, after the protection device is started up by a call, the residual voltage pulse or normal line call can be effectively judged by the joint judgment of the PT voltage and the signals of the residual voltage memory circuit, if a backup power supply of the protection device is electrified, the residual voltage detection can be effectively judged whether the residual voltage exists or not through the PT voltage detection, the residual voltage detection under various conditions can be effectively realized through the combined residual voltage detection protection device, thereby effectively improving the power grid recombination self-healing efficiency and reducing the power grid network recombination time, the power supply reliability of the power grid is greatly enhanced.
The protection device adopts a special residual voltage detection memory circuit based on the bistable relay and residual voltage judgment based on PT voltage detection of the protection device to form a combined residual voltage judgment device, and can accurately judge residual voltage signals under the conditions of electricity and no electricity of the protection device, thereby achieving effective recombination and self-healing of a power grid. The device has multiple functions of segmentation, contact, three-segment, boundary, intelligent distribution and the like, and is suitable for various different self-healing circuits of the power grid. The backup power supply of the device adopts the super capacitor as the backup power supply, and the device can be free of maintenance throughout the life.
Drawings
FIG. 1 is a residual voltage detection circuit of the protection device according to the present invention;
FIG. 2 is a block diagram of the protection device;
fig. 3 is a connection diagram of the protection device and the primary switch, wherein pins 1 and 2 are connected with an input side PT, pins 3 and 4 are connected with an output side PT, YXCOM is a remote signaling common terminal, YX5 and YX6 are input and output side residual voltage signals respectively, and YX7 is a residual voltage signal clearing signal.
Detailed Description
Example 1
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The following detailed description of the principles of the invention is provided in connection with the accompanying drawings.
A combined residual voltage detection protection device comprises a residual voltage detection circuit, a voltage and current analog quantity acquisition circuit, a key module, a power supply module, a microprocessor module, a display screen module, a network communication interface module, a storage module, a remote signaling input interface and a control output interface; the residual voltage detection circuit is connected with the I/O of the microprocessor module, the control output interface is connected with the microprocessor module, and the voltage and current analog quantity acquisition circuit is connected with the AD circuit of the microprocessor module; the output end of the key module is connected with the input end I/O of the microprocessor module; the output end of the power supply module is connected with the corresponding power supply port of the microprocessor module; the input end of the display screen module is connected with the I/O of the output end of the microprocessor module; the input end of the network communication interface module is connected with a communication interface of the microprocessor module; the input end of the storage module is connected with the I/O of the output end of the microprocessor module, the remote signaling input interface is connected with the I/O of the input end of the microprocessor module, and the control output interface is connected with the I/O of the output end of the microprocessor module.
The residual voltage detection circuit comprises a bistable relay which adopts HFD 2. The voltage and current analog quantity acquisition circuit comprises a voltage transformer and a current transformer, wherein the voltage transformer adopts a TR1176-3CH transformer, the current transformer adopts a TR211R1-1C transformer, and an AD circuit adopts AD 7606. The key module adopts a 4X4 keyboard to realize parameter setting. The power module is also provided with a backup power supply, the backup power supply adopts a NBC300-220D27 super capacitor management module, and the super capacitor management module adopts a TBC2835 super capacitor group. The microprocessor module adopts an STM32F407 microprocessor. The display screen module adopts an HF12864 lattice type LCD display screen. The network communication interface module is an RS485/RS 232/network communication interface module; the network communication interface module adopts an RS232 chip with isolation. The network communication interface module adopts a W5500 network module. The network communication interface module comprises a wireless communication device, and the wireless communication device adopts an INDTU331LH00-232-DS module. The remote signaling input interface adopts optical coupling isolation type remote signaling quantity input. The control output interface adopts 942H-1A-12DS relay to isolate output.
Referring to fig. 1, a combined residual voltage detection protection method, which adopts the protection device, under the condition that the protection device is not powered, residual voltage detection circuits of the protection device are adopted to detect residual voltage pulses of an input side PT and an output side PT, (1) if the input side PT has the residual voltage pulses, a first bistable relay K1 triggers attraction, which indicates that an instantaneous fault occurs at the input side of a line, if the input side line is normally restored to supply power in the first subsequent condition, the protection device is restored to supply power, at the moment, the protection device can detect a residual voltage relay closing signal at the input side through a remote signaling input port, and detects that the input side PT voltage is normal through a voltage sensor, the protection device judges that the line is normally supplied with power, a control switch is normally powered on and closed, if the output side line is normally restored to supply power in the second subsequent condition, the protection device is restored to supply power, at the moment, the residual voltage relay closing, however, the voltage sensor detects that the input side PT is non-electrified, the output side PT is normal, the protection device judges that the input side of the circuit has faults and is not recovered, the protection device can be locked, and the switch is prevented from being switched to have faults. (2) Similarly, if the protection device has no power, if the output side PT has residual voltage pulse, the second bistable relay K2 triggers suction to show that the output side of the circuit has transient fault, if the output side circuit recovers power supply normally in the first subsequent case, the protection device recovers power supply, at this time, the protection device can detect the closing signal of the output side residual voltage relay through the remote signaling input port, and detects that the output side PT voltage is normal through the voltage sensor, the protection device judges that the circuit is normally powered, the control switch normally obtains power and closes, if the input side circuit recovers power supply in the second subsequent case, the protection device recovers power supply, at this time, the protection device can detect the closing signal of the output side residual voltage relay through the remote signaling input port, but the output side PT has no power and the input side PT is normal, the protection device judges that the fault does not recover in the output side of the circuit, the protection device will latch to prevent the switch from opening and closing to a fault. Under the condition that the PT on both sides of the protection device is in voltage loss, the pin of a residual voltage signal clearing signal YX7 is controlled to clear the states of the first bistable relay K1 and the first bistable relay K2, and the residual voltage pulse detection under the condition that the protection device is not electrified next time is waited.
Claims (10)
1. A combined residual voltage detection protection device is characterized by comprising a residual voltage detection circuit, a voltage and current analog quantity acquisition circuit, a key module, a power module, a microprocessor module, a display screen module, an RS 232/network communication interface module, a storage module, a remote signaling input interface and a control output interface; the residual voltage detection circuit is connected with the I/O of the microprocessor module, the control output interface is connected with the output port of the processor, and the voltage and current sensor analog quantity acquisition circuit is connected with the AD circuit of the microprocessor module; the output end of the key module is connected with the input end I/O of the microprocessor module; the output end of the power supply module is connected with the corresponding power supply port of the microprocessor module; the input end of the display screen module is connected with the I/O of the output end of the microprocessor module; the RS 232/network communication interface module is connected with the communication interface of the microprocessor module; the input end of the storage module is connected with the I/O of the output end of the microprocessor module, the remote signaling input interface is connected with the I/O of the input end of the microprocessor module, and the control output interface is connected with the I/O of the output end of the microprocessor module.
2. The combined residual voltage detection and protection device as claimed in claim 1, wherein said residual voltage detection circuit comprises a bistable relay, said bistable relay employs HFD 2.
3. The combined residual voltage detection and protection device as claimed in claim 1, wherein the voltage and current analog acquisition circuit comprises a voltage transformer and a current transformer, the voltage transformer adopts a TR1176-3CH transformer, the current transformer adopts a TR211R1-1C transformer, and the AD circuit adopts an AD7606 transformer.
4. The combined residual voltage detection and protection device as claimed in claim 1, wherein the key module is a 4X4 keyboard; the display screen module adopts an HF12864 lattice type LCD display screen.
5. The combined residual voltage detection and protection device as claimed in claim 1, wherein the power module is further provided with a backup power source, the backup power source adopts a NBC300-220D27 super capacitor management module, and the super capacitor management module adopts a TBC2835 super capacitor group.
6. The combined residual voltage detection and protection device as claimed in claim 1, wherein the microprocessor module adopts an STM32F407 microprocessor.
7. The combined residual voltage detection and protection device according to claim 1, wherein the RS232 network communication interface module adopts an RS232 chip with isolation; the network communication interface module adopts a W5500 network module; the network communication interface module comprises wireless communication equipment, and the wireless communication module adopts an INDTU331LH00-232-DS module.
8. The combined residual voltage detection and protection device according to claim 1, wherein the remote signaling input interface adopts an optical coupling isolation type remote signaling quantity input.
9. The combined residual voltage detection and protection device as claimed in claim 1, wherein the control output interface adopts 942H-1A-12DS relay to isolate the output.
10. A combined residual voltage detection and protection method is characterized in that the protection device of any one of claims 1 to 9 is adopted, under the condition that the protection device is not electrified, residual voltage detection circuits of the protection device are adopted to detect residual voltage pulses of an input side PT and an output side PT, if the input side PT has the residual voltage pulses, a first bistable relay K1 triggers attraction, an instantaneous fault occurs on the input side of a circuit is indicated, if the input side circuit is normally powered up, the protection device is powered up again, at the moment, the protection device can detect an input side residual voltage relay closing signal through a remote signaling input port, and detects that the input side PT voltage is normal through a voltage sensor, the protection device judges that the circuit is normally powered up, a control switch is normally powered on and closed, if the output side circuit is powered up again, the protection device is powered up again, at the moment, the input side residual voltage relay closing signal can be detected through the remote signaling input port, however, the voltage sensor detects that the input side PT is non-electrified, the output side PT is normal, the protection device judges that the input side of the circuit has faults and is not recovered, the protection device can be locked, and the switch is prevented from being switched to have faults; if the protection device is in a non-power condition, such as residual voltage pulse at the output side PT, the second bistable relay K2 triggers pull-in, which indicates that transient fault occurs at the output side of the line, if the power supply of the output side circuit is normally recovered, the protection device recovers the power supply, at the moment, the protection device can detect the closing signal of the residual voltage relay at the output side through the remote signaling input port, and the voltage sensor detects that the PT voltage at the output side is normal, the protection device judges that the line supplies power normally, the control switch is normally powered on and switched on, if the input side line recovers power supply, the protection device recovers power supply, at the moment, the protection device can detect the closing signal of the residual voltage relay at the output side through the remote signaling input port, however, the output side PT is powerless, the input side PT is normal, the protection device judges that the output side of the circuit fails and is not recovered, the protection device can be locked, and the switch is prevented from being switched to fail; under the condition that the PT on both sides of the protection device is in voltage loss, the residual voltage signal clearing signal pin is controlled to clear states of the first bistable relay K1 and the first bistable relay K2, and residual voltage pulse detection under the condition that the protection device is not electrified next time is waited.
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| CN202011638746.7A CN112803351B (en) | 2020-12-31 | 2020-12-31 | Combined residual voltage detection protection device |
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| CN202011638746.7A CN112803351B (en) | 2020-12-31 | 2020-12-31 | Combined residual voltage detection protection device |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106771545A (en) * | 2017-01-25 | 2017-05-31 | 江苏大烨智能电气股份有限公司 | A kind of intelligent identification Method of 10kV line short faults voltage |
| CN108072784A (en) * | 2017-11-30 | 2018-05-25 | 南京四方亿能电力自动化有限公司 | A kind of distribution line residual voltage detection circuit based on single pulse Detection ＆ Controling |
| CN109842211A (en) * | 2019-03-04 | 2019-06-04 | 石家庄科林电气股份有限公司 | A kind of residual voltage detection method of residual voltage logging modle and automatic circuit formula line feed terminals |
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2020
- 2020-12-31 CN CN202011638746.7A patent/CN112803351B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106771545A (en) * | 2017-01-25 | 2017-05-31 | 江苏大烨智能电气股份有限公司 | A kind of intelligent identification Method of 10kV line short faults voltage |
| CN108072784A (en) * | 2017-11-30 | 2018-05-25 | 南京四方亿能电力自动化有限公司 | A kind of distribution line residual voltage detection circuit based on single pulse Detection ＆ Controling |
| CN109842211A (en) * | 2019-03-04 | 2019-06-04 | 石家庄科林电气股份有限公司 | A kind of residual voltage detection method of residual voltage logging modle and automatic circuit formula line feed terminals |
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