CN211701459U - Realize residual current operated circuit breaker device - Google Patents
Realize residual current operated circuit breaker device Download PDFInfo
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- CN211701459U CN211701459U CN202020551206.4U CN202020551206U CN211701459U CN 211701459 U CN211701459 U CN 211701459U CN 202020551206 U CN202020551206 U CN 202020551206U CN 211701459 U CN211701459 U CN 211701459U
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Abstract
The utility model provides a realize residual current operated circuit breaker device, includes microprocessor, microprocessor links to each other with clock circuit, data storage circuit, serial ports to RS485 communication circuit, keying circuit, display circuit, dropout executive circuit, power conversion circuit, current-voltage acquisition circuit, current detection circuit. The invention adopts the design and the method, and the residual current operated circuit breaker equipment adopts an integrated design, thereby greatly reducing the volume of the circuit breaker equipment, being very convenient to install, reducing the configuration time of a power line, improving the configuration efficiency of the power line, simultaneously reducing the maintenance cost, having high accuracy of the acquisition method, and fundamentally solving the problem of unclear district to which the ammeter belongs due to the reasons of district crosstalk, the relation disorder of the district ammeter and the like.
Description
The technical field is as follows:
the utility model belongs to the technical field of electric power and specifically relates to a realize residual current operated circuit breaker device.
Background art:
the residual current operated circuit breaker is a commonly used electric appliance, and is mainly used for detecting residual current, comparing a residual current value with a reference value, and disconnecting a main circuit contact when the residual current value exceeds the reference value. Currently, residual current operated circuit breakers have some problems:
(1) the existing residual current operated circuit breaker is inconvenient to install, and according to the requirement of the electrical appliance installation specification of a low-voltage distribution network side, a switch device needs to be installed on each middle and low-voltage side box body node, the residual current operated circuit breaker is installed in a small space in a box body, and due to the fact that the installation position and the space are not limited, under the condition that an installation line is not reserved, the installation line is messy, the line flies and is broken, and serious potential safety hazards are buried in the whole middle and low-voltage platform area nodes.
(2) The conventional circuit breaker has single function, only has the circuit breaker attribute function and the residual current protection function of a residual current circuit breaker, and does not have the corresponding functions of identifying, analyzing and transmitting the network topology of the transformer area.
With the continuous expansion of system scale, especially the formation of interconnected large power grids, medium and high voltage transmission network lines are relatively clear, and the effect of medium and high voltage transmission network relation is relatively weakened, so that the medium and low voltage network topological structure in the power system becomes especially important. The interconnection of power grids is an objective rule for the development of the electric industry of various countries and is a necessary trend for the development of electric power of various countries in the world. In the large medium and low voltage transformer area network, the number of nodes is large, the connection is super-complex, the change is changeable, and the real-time requirement is ultrahigh, so that the network topology of the medium and low voltage transformer area is difficult to draw in real time, the manual drawing needs to consume a large amount of manpower, the drawn topological structure is difficult to correspond in real time, and the error is large.
The conventional circuit breaker cannot meet the requirement of automatic identification of a power grid in a medium-low voltage transformer area; if a low-voltage distribution area network topology device is additionally installed, the low-voltage distribution area network topology device and the low-voltage distribution area network topology device are installed at the same time, the matching degree is poor, the integration level is low, the cost is high, the maintenance is inconvenient, and the efficiency of the whole system is reduced.
(3) Even if the existing medium and low voltage transformer area network topology device is integrated into a conventional circuit breaker, the existing medium and low voltage transformer area network topology device also has a plurality of defects: at present, the network topology of the whole medium and low voltage transformer area is very complicated to draw, and the method is a system project. The current implementation mode comprises a partial implementation mode of a topological device and an artificial + topological device implementation mode.
If an equipment part implementation mode is adopted, one part of the troubleshooting is carried out through the functions of the topological device, so that the problems in real time and accuracy are more, an accurate result cannot be achieved, power failure and installation are needed for installing equipment, the process is very complex, the efficiency is not high, and the result is not ideal;
if the manual and equipment mode is adopted, although the accuracy is improved, the real-time performance is poor, the time required for one-time manual general survey is long, the real-time topological graph cannot be corresponded, and the efficiency is low.
The utility model has the following contents:
the utility model provides a realize residual current operated circuit breaker device, solved the problem that exists among the prior art.
The utility model discloses a solve the technical scheme that above-mentioned technical problem adopted and be:
a circuit breaker device for realizing residual current action comprises a microprocessor, wherein the microprocessor is connected with a clock circuit, a data storage circuit, a serial port-to-RS 485 communication circuit, a key circuit, a display circuit, a tripping execution circuit, a power supply conversion circuit, a current and voltage acquisition circuit and a current detection circuit;
the current detection circuit is connected with the current transformer and the drive circuit;
the power conversion circuit is connected with the broadband carrier communication circuit, and the broadband carrier communication circuit is connected with the current pulse circuit;
the clock circuit provides working clock frequency for the microprocessor;
the data storage circuit is used for storing valid data and codes;
the serial port-to-RS 485 communication circuit is used for data interaction between microprocessor data and peripheral equipment;
the key circuit is used for setting or correcting the set parameters and states through manual operation;
the display circuit is used for displaying data, parameters and alarm information;
the tripping execution circuit is used for controlling the opening and closing state of the structural part of the tripper according to the instruction of the microprocessor or manual control action;
the power conversion circuit is used for converting an on-site three-phase/single-phase power supply into available voltage of equipment;
the current and voltage acquisition circuit is used for acquiring voltage and current data under the environment of the outgoing line side of the three-phase or single-phase switch;
the current detection circuit is used for converting the residual current signal into a voltage signal to obtain a sampling voltage;
the current pulse circuit is used for transmitting transient pulse current at a three-phase or single-phase acquisition voltage end;
the broadband carrier communication circuit is used for broadband carrier communication among equipment in the electric wire of the low-voltage transformer area;
the microprocessor collects the voltage information obtained by the current detection circuit and sends an instruction to the tripping execution circuit according to the voltage information so as to control the tripper; and simultaneously, acquiring current and voltage information obtained by the current and voltage acquisition circuit to form a corresponding relation of physical lines in the low-voltage transformer area.
The current transformer comprises an iron core and a current modulation circuit, a primary coil or a secondary coil of the current modulation circuit is wound on the iron core, and the output end of the current modulation circuit is connected with a current detection circuit.
The display circuit comprises an LCD display circuit and a digital display circuit, and the LCD display circuit and the digital display circuit are connected with the microprocessor;
the LCD display circuit includes: the backlight control circuit, the frequency control circuit and the low-frequency filter circuit are connected with the power supply; the backlight control circuit is used for controlling the LCD to display contrast brightness parameters; the frequency control circuit is used for controlling the flickering frequency of the LCD screen; the low-frequency filter circuit is used for removing the crosstalk problem of the low-frequency signal to the display screen signal;
the digital display circuit comprises a one-bit or multi-bit digital tube group, and a control interface of the digital tube is connected with an A/D interface of the microprocessor.
The utility model adopts the above design scheme, have following advantage:
(1) the residual current operated circuit breaker equipment adopts an integrated design, and each circuit part is reasonable in design, so that the volume of the circuit breaker equipment is greatly reduced, and the installation is very convenient; the situations of messy installation lines, wire flying and wire breaking during installation are avoided, and potential safety hazards are eliminated;
(2) the attribute function and the residual current protection function of the circuit breaker are combined with the low-voltage distribution area network topology identification function, and when power is configured, a low-voltage distribution area network topology device does not need to be additionally installed, so that the integration level is high, the cost is reduced, the power line configuration time is shortened, the power line configuration efficiency is improved, and meanwhile, the maintenance cost is also reduced;
(3) the low-voltage distribution area network topology identification function combined in the residual current operated circuit breaker is ingenious in design, the mortgage distribution area network topology structure can be automatically obtained, when the topology in the distribution area changes, the topology structure result after the topology structure changes can be automatically identified through the intelligent distribution terminal, the real-time performance is high, meanwhile, the link of manual inspection is omitted, and the labor cost is saved; the acquisition method is high in accuracy, and the problem that the region to which the ammeter belongs is unclear due to the reasons of region crosstalk, region ammeter relation disorder and the like is fundamentally solved.
Description of the drawings:
FIG. 1 is a block diagram of the present invention;
FIG. 2 is a schematic circuit diagram of an LCD display circuit according to the present invention;
fig. 3 is a schematic circuit diagram of the wideband carrier communication circuit of the present invention.
The specific implementation mode is as follows:
in order to clearly illustrate the technical features of the present invention, the present invention is explained in detail by the following embodiments in combination with the accompanying drawings.
As shown in fig. 1-3, a device for implementing a residual current operated circuit breaker includes a microprocessor, which is connected to a clock circuit, a data storage circuit, a serial port to RS485 communication circuit, a key circuit, a display circuit, a trip execution circuit, a power conversion circuit, a current and voltage acquisition circuit, and a current detection circuit; the current detection circuit is connected with the current transformer and the drive circuit; the power conversion circuit is connected with the broadband carrier communication circuit, and the broadband carrier communication circuit is connected with the current pulse circuit;
the clock circuit is used for providing working clock frequency for the microprocessor;
a data storage circuit for storing valid data and codes;
the serial port-to-RS 485 communication circuit is used for data interaction between microprocessor data and peripheral equipment;
the key circuit is used for setting or correcting the set parameters and states through manual operation;
the display circuit is used for displaying data, parameters and alarm information;
the tripping execution circuit is used for controlling the opening and closing state of the structural part of the tripper according to the instruction of the microprocessor or manual control action;
the power conversion circuit is used for converting an on-site three-phase/single-phase power supply into available voltage of equipment;
the current and voltage acquisition circuit is used for acquiring voltage and current data under the environment of the outgoing line side of the three-phase or single-phase switch;
the current detection circuit is used for converting the residual current signal into a voltage signal to obtain a sampling voltage;
the current pulse circuit is used for transmitting transient pulse current at a three-phase or single-phase acquisition voltage end;
the pulse current is also called as pulsating current, which means current with constant direction and changing intensity. Strictly speaking, the current output by the dc generator is a pulsating current. Except that the magnitude of this change in current intensity is small. Pulsed current is also a current in which a unidirectional (cathodic) current is periodically interrupted by a series of open circuits (no current passing). Unlike commutating current, which does not make the plating part as anode, the power supply is stopped intermittently, and the cathode potential is periodically changed with time due to intermittent interruption of current. The waveform includes square wave, sine wave, triangular wave, sawtooth wave and the like. The utility model discloses the wavelet detection method that adopts, the signal of this method can guarantee not to stride the transformer, can guarantee the point-to-point communication at no dead angle in the platform district moreover, need not the carrier wave and relay, so all residual current circuit breakers in the all table casees of this transformer management, the homoenergetic receives the distribution transformer terminal address and the phase information of platform district identification appearance broadcasting.
The broadband carrier communication circuit is used for broadband carrier communication among equipment in the electric wire of the low-voltage transformer area;
the broadband carrier communication circuit mainly comprises a power line coupling unit, a zero-crossing detection unit, a power line signal modulation part (comprising a primary band-pass filter circuit, a secondary band-pass filter circuit and a low-frequency filter circuit), a carrier communication chip SPI level signal circuit and a carrier communication chip basic circuit (comprising a clock circuit and a reset circuit). The power coupling unit is an output and input path of the carrier signal and plays a role in isolating 220V/50Hz power frequency. T3 is used as a signal coupling transformer, and the impedance of the power line side is generally 3-30 omega. Then determining the turn ratio or impedance ratio 12/21 of the primary and secondary coils, so as to reduce the impedance interference on the power line side to a certain extent; moreover, the frequency transmitted by the signal coupling transformer T3 is higher (100-400 kHz) and is far greater than the frequency of a power grid; the purpose of isolating high voltage and low voltage is realized, so that the power carrier signal receiving and transmitting channel is smooth and unobstructed, and the high voltage can be isolated. RC in the band-pass filter circuit is used for discharging a capacitor when the capacitor is off-line, so that high voltage is prevented from appearing at two ends of a device plug, and besides, out-of-band clutter is filtered and impedance matching between the front-stage circuit and the rear-stage circuit is guaranteed, so that stable and reliable power line carrier signal communication is guaranteed again. The zero-crossing detection unit is used for detecting the triggering condition of the power line communication channel; because the interference energy of wave crests and wave troughs is large in power carrier transmission, signals need to be transmitted and received in a power carrier wave form zero state; full-wave rectification is carried out through two reverse diodes to form a pulsating direct current waveform, after resistance voltage division, high-frequency components are filtered through capacitance filtering to form a voltage waveform at a collector of the triode; when the voltage of the collector is greater than 0.7V, the triode Q2 is conducted, and a low level is formed at the collector of the triode; when the voltage of the triode collector is lower than 0.7V, the triode is cut off, and the triode collector forms a high level through a pull-up resistor R87. In this way, through the repeated conduction and cut-off of the triode, a 100Hz pulse waveform is formed at the zero-crossing detection 15 port of the carrier communication chip, and the chip detects the zero point of the power line voltage through judgment.
Broadband carrier communication transmits analog or digital signals at high speed in a carrier mode.
The microprocessor is used for collecting the voltage information obtained by the current detection circuit and sending an instruction to the tripping execution circuit according to the voltage information so as to control the tripper; and simultaneously, acquiring current and voltage information obtained by the current and voltage acquisition circuit to form a corresponding relation of physical lines in the low-voltage transformer area.
The current transformer comprises an iron core and a current modulation circuit, a primary coil or a secondary coil of the current modulation circuit is wound on the iron core, and the output end of the current modulation circuit is connected with the current detection circuit.
The current modulation circuit includes: comparing the amplifier and the sampling resistor; the front end of the sampling resistor is respectively connected with the first end of the secondary coil, the inverting input end of the comparison amplifier and the current detection circuit, and the second end of the sampling resistor is grounded; and the output end of the comparison amplifier is connected with the second end of the secondary coil.
The display circuit comprises an LCD display circuit and a digital display circuit, and the LCD display circuit and the digital display circuit are connected with the microprocessor;
the LCD display circuit includes: the backlight control circuit, the frequency control circuit and the low-frequency filter circuit are connected with the power supply; the backlight control circuit is used for controlling the LCD to display contrast brightness parameters; the frequency control circuit is used for controlling the flickering frequency of the LCD screen; the low-frequency filter circuit is used for removing the crosstalk problem of the low-frequency signal to the display screen signal;
the digital display circuit comprises a one-bit or multi-bit digital tube group, and a control interface of the digital tube is connected with an A/D interface of the microprocessor.
The residual current operated circuit breaker is arranged at each node of the power distribution cabinet, the branch cabinet and the meter box, when the residual current operated circuit breaker works, the residual current operated circuit breaker collects current data through a current transformer, when a fault point occurs in a circuit, the current transformer generates unbalanced residual current, the residual current signal passes through a current modulation circuit, and then the current detection circuit converts the current signal into a voltage signal and obtains sampling voltage; and if the sampling voltage is greater than the voltage threshold value data, controlling the tripping circuit to execute the tripping operation action.
A method for realizing automatic identification of a residual current operated circuit breaker device and topology comprises the following steps: the method comprises the following steps:
(1) and (3) identifying the user variation relationship:
A. installing a breaker: residual current operated circuit breakers are arranged in the power distribution cabinet, the branch box and the meter box;
B. the main node sends an instruction: a broadcast sending and responding mechanism is arranged among microprocessors based on residual current operated circuit breakers, a current pulse circuit of a residual current operated circuit breaker V arranged on a W main node of a power distribution cabinet sends a broadcast station area identification instruction of a station area where the residual current operated circuit breaker V is located through a switch outlet side of the power distribution cabinet, and the identification instruction comprises ID number information and phase information of a power distribution terminal;
when the identification instruction is sent, the phase A, the phase B and the phase C are respectively sent, the sending signal needs 60 seconds, and in order to ensure that all nodes under a transformer area receive the identification instruction signal, each phase is sent for 2 times;
due to the characteristic that the current pulse signal does not cross the transformer area, the signal cannot be sent to other residual current operated circuit breakers which are not in the transformer area;
C. receiving instructions from the node: after all residual current operated circuit breakers of slave nodes arranged at different levels under the power distribution cabinet W receive the identification instruction information in the step B, the microprocessor can automatically store the ID number information and the phase information in the identification instruction, and even if the power failure information is not lost;
D. registering from the node: the residual current operated circuit breaker of the slave node sends registration information through the broadband carrier communication circuit, the registration information comprises the ID number information and the phase information in the step C, the registration information sent by the broadband carrier communication circuit comprises all the information automatically stored in the step C, and the sent registration information is received by the residual current operated circuit breaker V of the master node;
E. polling from the node: d, the residual current operated circuit breaker V inquires the received registration information in the step D, compares ID number information and phase information in the registration information, if the ID number information and the phase information are consistent with the identification information in the step B, the slave node belongs to the current transformer area, and if the ID number information and the phase information are different, the slave node does not belong to the current transformer area and is deleted;
since the problem of the channel crossing region occurs in the transmission mechanism of the broadband carrier communication circuit, all the registered slave nodes received by the master node in step D are not necessarily slave nodes of the current channel, and therefore, screening is required. Whether the slave node is the slave node of the local area can be clearly judged according to the ID number information and the phase information in the registration information.
F. And (3) reporting by the slave node: e, the residual current operated circuit breaker V of the main node reports the slave nodes which are subjected to the network access after the step E to the main station;
(2) branch recognition
G. Selecting a residual current operated circuit breaker X arranged in the meter box, generating a branch identification signal on one phase of electricity by the residual current operated circuit breaker X, receiving the branch identification signal by all residual current operated circuit breakers belonging to a branch line, and acquiring branch information of an operated circuit breaker of the branch identification signal by collecting residual current operated circuit breakers V of a main node, so as to acquire the branch information of the residual current operated circuit breaker X;
based on the KCL current main loop conservation theorem, that is, a load current is generated on a certain phase of the end device, an equivalent current is added to all branch lines supplying power to the meter box, and the currents of other branch lines are not changed, so that which nodes are included in the branch where the residual current operated circuit breaker X is located can be obtained through the step G.
H. Step G is sequentially carried out on residual current operated circuit breakers arranged in the meter box, branch information of all residual current operated circuit breakers located in the meter box is obtained, and all the branch information is reported to the master station by the residual current operated circuit breaker V of the master node;
after the branch information of all residual current operated circuit breakers located in the meter box is obtained, the main node can perform reasoning calculation according to the branch crossing condition of each residual current operated circuit breaker to obtain a complete branch structure and a complete hierarchy structure.
(3) And (3) the master station collects the user variation relationship information obtained in the step (1) and the branch information obtained in the step (2) to obtain a complete network topology structure.
The above-mentioned specific embodiments can not be regarded as the restriction to the scope of protection of the utility model, to technical personnel in this technical field, it is right the utility model discloses any replacement improvement or transform that embodiment made all fall within the scope of protection of the utility model.
The parts of the present invention not described in detail are the known techniques of those skilled in the art.
Claims (3)
1. The utility model provides a realize residual current operated circuit breaker device which characterized in that: the intelligent control circuit comprises a microprocessor, wherein the microprocessor is connected with a clock circuit, a data storage circuit, a serial port-to-RS 485 communication circuit, a key circuit, a display circuit, a tripping execution circuit, a power conversion circuit, a current and voltage acquisition circuit and a current detection circuit;
the current detection circuit is connected with the current transformer and the drive circuit;
the power conversion circuit is connected with the broadband carrier communication circuit, and the broadband carrier communication circuit is connected with the current pulse circuit;
the clock circuit provides working clock frequency for the microprocessor;
the data storage circuit is used for storing valid data and codes;
the serial port-to-RS 485 communication circuit is used for data interaction between microprocessor data and peripheral equipment;
the key circuit is used for setting or correcting the set parameters and states through manual operation;
the display circuit is used for displaying data, parameters and alarm information;
the tripping execution circuit is used for controlling the opening and closing state of the structural part of the tripper according to the instruction of the microprocessor or manual control action;
the power conversion circuit is used for converting an on-site three-phase/single-phase power supply into available voltage of equipment;
the current and voltage acquisition circuit is used for acquiring voltage and current data under the environment of the outgoing line side of the three-phase or single-phase switch;
the current detection circuit is used for converting the residual current signal into a voltage signal to obtain a sampling voltage;
the current pulse circuit is used for transmitting transient pulse current at a three-phase or single-phase acquisition voltage end;
the broadband carrier communication circuit is used for broadband carrier communication among equipment in the electric wire of the low-voltage transformer area;
the microprocessor collects the voltage information obtained by the current detection circuit and sends an instruction to the tripping execution circuit according to the voltage information so as to control the tripper; and simultaneously, acquiring current and voltage information obtained by the current and voltage acquisition circuit to form a corresponding relation of physical lines in the low-voltage transformer area.
2. A device for realizing a residual current operated circuit breaker, as claimed in claim 1, characterized in that: the current transformer comprises an iron core and a current modulation circuit, wherein the current modulation circuit is used for adjusting current, a primary coil or a secondary coil of the current modulation circuit is wound on the iron core, and the output end of the current modulation circuit is connected with a current detection circuit.
3. A device for realizing a residual current operated circuit breaker, as claimed in claim 1, characterized in that: the display circuit comprises an LCD display circuit and a digital display circuit, and the LCD display circuit and the digital display circuit are connected with the microprocessor;
the LCD display circuit includes: the backlight control circuit, the frequency control circuit and the low-frequency filter circuit are connected with the power supply; the backlight control circuit is used for controlling the LCD to display contrast brightness parameters; the frequency control circuit is used for controlling the flickering frequency of the LCD screen; the low-frequency filter circuit is used for removing the crosstalk problem of the low-frequency signal to the display screen signal;
the digital display circuit comprises a one-bit or multi-bit digital tube group, and a control interface of the digital tube is connected with an A/D interface of the microprocessor.
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| CN202020551206.4U CN211701459U (en) | 2020-04-14 | 2020-04-14 | Realize residual current operated circuit breaker device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111342425A (en) * | 2020-04-14 | 2020-06-26 | 山东德源电力科技股份有限公司 | Residual current operated circuit breaker and platform area network topology identification method |
| CN112583123A (en) * | 2020-12-15 | 2021-03-30 | 国网北京市电力公司 | Intelligent molded case circuit breaker |
-
2020
- 2020-04-14 CN CN202020551206.4U patent/CN211701459U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111342425A (en) * | 2020-04-14 | 2020-06-26 | 山东德源电力科技股份有限公司 | Residual current operated circuit breaker and platform area network topology identification method |
| CN112583123A (en) * | 2020-12-15 | 2021-03-30 | 国网北京市电力公司 | Intelligent molded case circuit breaker |
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