On-site digital pole-mounted circuit breaker primary and secondary fusion system

Abstract

The utility model provides a primary and secondary fusion system for an on-site digital pole-mounted circuit breaker. The primary and secondary fusion system comprises a 10KV switch body, a capacitance electricity-taking digital controller FTUI and a man-machine interaction device FTU2, the 10KV switch body comprises a capacitor power taking device, an actuating mechanism, an ECT4 path and an EVT4 path; wherein the capacitance power-taking digital controller FTUI comprises an MCU (Microprogrammed Control Unit); the capacitor power taking device supplies power to the MCU through the power supply module; the actuating mechanism is electrically connected with the MCU, and outputs of the ECT4 path and the EVT4 path are processed and then sent to the MCU; the man-machine interaction device FTU2 comprises a man-machine interaction function and a 485 communication module, and the 485 communication module is in signal connection with the MCU through a 485 isolation sending module; according to the on-site digital pole-mounted circuit breaker primary and secondary fusion system, the FTU1 is mainly responsible for basic functions of data acquisition and processing, relay protection and the like; the FTU2 is mainly responsible for functions such as man-machine interaction and communication which need to be frequently changed according to customer requirements, the problem of long-distance transmission of analog signals or sampling value digital messages can be completely avoided, and the reliability of the system is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to in situ digitalization column breaker primary and secondary fusion system technical field, concretely relates to a kind of in situ digitalization column breaker primary and secondary fusion system. BACKGROUND

[0002] With the digital transformation of distribution network under new situation, the promotion of intelligent distribution network construction, a large number of traditional power equipment ushered in a new round of iteration, at the same time, the boundary of primary and secondary equipment in traditional sense becomes blurred, the fusion of FTU and switch body, voltage and current transformer / sensor is also deepening. To solve the problem that primary high-voltage switch and secondary intelligent feeder terminal device do not match in large-scale construction and reconstruction of distribution network, the existing primary and secondary fusion column breaker scheme and peer scheme mainly adopt primary and secondary complete set mode, that is, various types of transformers / sensors such as CT, LPCT, EVT and CVT are combined with primary body equipment, and standardized aviation connector is used to interact with terminal equipment for measurement, metering and control information, to realize bidding and procurement and detection of primary and secondary complete set equipment. In recent years, the industry has appeared that electronic voltage and current sensors are combined with digital unit (ADMU), and the collected electrical analog signals are digitized by ADMU and transmitted to feeder terminal, which has similar structure to electronic mode structure. Compared with traditional FTU, this method uses digital signal transmission sampling value, avoids analog small signal long-distance transmission, and solves part of the original distribution automation problem.

[0003] For example Figure 1 The system structure of the above-mentioned ADMU-based FTU is used to illustrate. The ADMU-based FTU is very similar to the traditional FTU in structure and function, and its main components are: primary voltage and current sensors and digital unit ADMU together constitute a digital combined transformer with digital output interface, and the digital combined transformer and digital FTU use cable to communicate with FT3 protocol, which has the following problems in actual use.

[0004] 1) The ability to resist strong electromagnetic interference is still insufficient. In addition, since RS485 interface is used to transmit sampling value data, the communication rate is very high, and error code is also easy to produce.

[0005] 2) FT3 protocol has the characteristics of privacy and protocol format diversification. The ADMU and decoding board FT3 protocol of existing manufacturers are difficult to realize mutual connection and plug-in replacement, and there is still a problem that manufacturers' protocol formats are inconsistent, causing the problem of unable to interconnect in actual application.

[0006] 3) The sampling data is converted into digital data after analog-digital conversion, and then is double digital converted by ADMU coding and decoding board on the digital FTU, so as to be used by the CPU of the FTU, the sampling data transmission link is redundant, error-prone and increases the hardware cost, and is not suitable for occasions with high sampling value delay requirement.

[0007] 4) This method still faces the same problems as the traditional method, such as: the interface of the primary and secondary devices is not matched, the compatibility, expandability and interchangeability are poor; the responsibility disputes of the primary and secondary device manufacturers; the precision and dynamic range cannot support the line loss calculation and single-phase grounding fault detection requirements; the remote signaling jitter and device condensation phenomenon; the lack of primary and secondary device linkage test mechanism; the material bidding management work is complicated, and the material supply link occupies a long time, and these problems have not been effectively solved.

[0008] Therefore, it is necessary to design a primary and secondary fusion system of on-site digital pole-mounted circuit breaker. Practical new type content

[0009] The utility model discloses a primary and secondary fusion system of on-site digital pole-mounted circuit breaker can effectively improve the integration and intelligent level of primary and secondary fusion system of on-site digital pole-mounted circuit breaker for the purpose of solving the problems in the background art.

[0010] The specific technical scheme is as follows:

[0011] A primary and secondary fusion system of on-site digital pole-mounted circuit breaker, comprising: 10KV switch body, capacitor power taking digital controller FTUI, human-computer interaction device FTU2;

[0012] The 10KV switch body comprises a capacitor power taking device, an action mechanism, an ECT4 path and an EVT4 path.

[0013] The capacitor power taking digital controller FTUI comprises an MCU.

[0014] The MCU comprises fault protection logic, recording wave function, data storage, time synchronization, residual voltage detection, line loss calculation and remote signaling and remote control function.

[0015] The capacitor power taking device supplies power for the MCU through a power module.

[0016] The action mechanism is electrically connected with the MCU, and the output of the ECT4 path and the EVT4 path is sent to the MCU after processing.

[0017] The human-computer interaction device FTU2 comprises human-computer interaction function and 485 communication module, and the 485 communication module is connected with the MCU through a 485 isolation sending module.

[0018] As an optimal scheme of the utility model, the MCU controls the opening and closing of the action mechanism and the storage of energy through 3-way remote control, and the open / close / energy storage state of the action mechanism is input into the MCU after being processed by the remote signaling processing circuit.

[0019] As an optimal scheme of the utility model, the 4-way output of IA, IB, IC and IO of the ECT4 is sent to the MCU after current signal processing through high-precision ADC.

[0020] As an optimal scheme of the utility model, the 4-way output of UA, UB, UC and UO of the EVT4 is sent to the MCU after impedance conversion and voltage signal processing through high-precision ADC.

[0021] As an optimal scheme of the utility model, the man-machine interaction device FTU2 further comprises a backup power supply, which provides DC power supply for the 10KV switch body and the capacitor power supply digital controller FTUI.

[0022] As an optimal scheme of the utility model, the man-machine interaction device FTU2 further comprises a Beidou / GPS receiver.

[0023] The utility model has the following beneficial effects:

[0024] The primary and secondary fusion system of the on-site digitalized pole-mounted circuit breaker deeply fuses the primary body device and the secondary terminal device, mainly divided into the primary switch (containing FTU1) and the man-machine interaction terminal with FTU2 as the core, the FTU1 is mainly responsible for data acquisition and processing, relay protection and other basic functions; the FTU2 is mainly responsible for man-machine interaction, communication and other functions that need to be frequently changed according to customer requirements. The system has the following obvious technical advantages compared with the traditional primary and secondary fusion complete set:

[0025] 1. The long-distance transmission problem of analog signals or sampled value digital messages can be completely avoided, and the reliability of the system is improved;

[0026] 2. There is only power supply and communication cable between the primary and secondary, and the fusion degree is higher, completely solving the problem of mismatching and poor interchangeability of the primary and secondary device interfaces.

[0027] 3. The on-site digitalization makes the precision and dynamic range better support the line loss calculation and single-phase grounding fault detection requirements

[0028] 4. The control opening and closing is integrated in the switch body, which shortens the opening and closing time and improves the response speed.

[0029] 5. The remote signaling jitter and equipment condensation problem are solved.

[0030] 6. The problems of complicated linkage test of primary and secondary devices and material bidding management are solved.

[0031] 7. Compared with the digitization of ADMU, the encoding and decoding links are reduced, less electronic circuit, less connection cable and plug, and thus more economical and environmental. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 The figure is a schematic diagram of prior art digitization unit ADMU and digital FTU;

[0033] Figure 2 The figure is a whole schematic diagram of the primary and secondary fusion system of the on-site digitization pole circuit breaker provided by the embodiment of the utility model;

[0034] Figure 3 The figure is a local circuit of the primary and secondary fusion system of the on-site digitization pole circuit breaker provided by the embodiment of the utility model; Figure 1

[0035] Figure 4 The figure is a local circuit of the primary and secondary fusion system of the on-site digitization pole circuit breaker provided by the embodiment of the utility model; Figure 2

[0036] Figure 5 The figure is a main circuit of the primary and secondary fusion system of the on-site digitization pole circuit breaker provided by the embodiment of the utility model; Figure 3

[0037] Figure 6 The figure is a main circuit diagram of the primary and secondary fusion system of the on-site digitization pole circuit breaker provided by the embodiment of the utility model; Figure 4 DETAILED DESCRIPTION

[0038] The technical scheme of the utility model will be further illustrated by specific embodiments in combination with the drawings.

[0039] The drawings are only used for example illustration, and the representation is only a schematic diagram, not a real object diagram, and cannot be understood as the limitation of the patent; in order to better illustrate the embodiment of the utility model, some components of the drawings will be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some known structures and their descriptions in the drawings can be omitted.

[0040] ​​​​The same or similar reference signs in the drawings of the embodiments of the present utility model correspond to the same or similar components; in the description of the present utility model, it is understood that, if the terms "upper", "lower", "left", "right", "inner", "outer" and the like appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, and therefore the terms describing the position relationship in the drawings are only used for exemplary illustration, and cannot be understood as a limitation on the present patent, and for ordinary skilled persons in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0041] In the description of the present utility model, unless explicitly specified and limited, if the term "connection" and the like appear to indicate the connection relationship between components, the term should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication inside two components or the interaction relationship between two components. For ordinary skilled persons in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0042] Embodiment one

[0043] As Figure 2 The utility model embodiment provides a kind of digital pole-mounted circuit breaker primary and secondary fusion system on site, comprising: 10KV switch body, electric capacity power taking digital controller FTUI, man-machine interactive equipment FTU2;

[0044] Wherein, 10KV switch body includes electric capacity power taking device, action mechanism, ECT4 way, EVT4 way;

[0045] Wherein, electric capacity power taking digital controller FTUI includes MCU, and MCU is connected with man-machine interactive equipment FTU2 signal;

[0046] MCU includes fault protection logic, recording wave function, data storage, time, residual voltage detection, line loss calculation, remote signaling and remote control function;

[0047] Electric capacity power taking device is powered for MCU by power module;

[0048] MCU is controlled to the action mechanism by 3-way remote control and is opened, closed and energy storage, and the open / close / energy storage position of action mechanism is input to MCU after being handled by remote signaling processing circuit;

[0049] The 4-way output of IA, IB, IC, IO of ECT4 way is sent to MCU by high-precision ADC after current signal processing;

[0050] The 4-way output of the UA, UB, UC, UO of the EVT4 way is sent to the MCU through impedance conversion, voltage signal processing and high-precision ADC;

[0051] The man-machine interaction device FTU2 includes a man-machine interaction function, a 485 communication module, a Beidou / GPS receiver and a backup power supply.

[0052] The backup power supply provides DC power supply for the 10KV switch body and the capacitor power supply digital controller FTUI, and the 485 communication module is connected with the MCU signal through the 485 isolation sending module.

[0053] The primary and secondary fusion system of the on-site digital pole-mounted circuit breaker:

[0054] The scheme is combined with the standardized design of primary equipment, and the main work is to deeply fuse the primary body equipment and high-precision sensors with secondary terminal equipment into a pole-mounted circuit breaker with a highest rated voltage of 12kV and a three-phase alternating current of 50Hz. It is mainly used for breaking overload current and short-circuit current, and realizing line fault monitoring, judgment and processing, and has the characteristics of simple installation and convenient maintenance.

[0055] As Figure 2 The switch overall structure is mainly divided into two parts of the primary and secondary fusion switch containing the capacitor power supply digital controller FTUI and the man-machine interaction terminal with the man-machine interaction device FTU2 as the core.

[0056] The specific implementation of the primary and secondary fusion system of the on-site digital pole-mounted circuit breaker is as follows:

[0057] 1. Integrated design of power supply device, providing working power supply for device components.

[0058] This switch adopts an integrated pole, and high-voltage capacitor power supply devices are arranged in the A and C phase poles from the power supply side and the load side respectively, and a double-sided power supply mode is adopted, so that the switch body and the power supply device are integrated designed. The power supply device is not affected by weather and load current changes, and is stable and reliable.

[0059] 2. Integrated design of capacitor power supply digital controller FTUI, realizing information acquisition and automatic control.

[0060] The intelligent measurement and control terminal is integrated with the switch body. The core control software and circuit based on adaptive data acquisition, measurement and fault judgment algorithm are designed to realize the functions of power parameter acquisition, line voltage discrimination, over-limit alarm sending, fault detection and discrimination, fault tripping removal, automatic reclosing and other functions. Negative sequence / zero sequence / grounding, over / low voltage, over / low frequency, surge protection is prepared. Electronic transformer is supported. The switch device state monitoring function is integrated. Thus, the intelligent control of circuit breaker and the primary and secondary integration are realized to meet the requirements of intelligent, automatic and multi-functional distribution network.

[0061] 3. The man-machine interaction device FTU2 is installed in the middle of the tower to realize remote communication.

[0062] The FTU2 is configured with Beidou / GPS to undertake the tasks of distributed peer-to-peer communication, fault identification and isolation, and man-machine interaction, uplink and downlink communication. The data exchange between FTU2 and FTU1 adopts serial port or Ethernet communication mode. The communication medium can be wired or wireless, and the communication protocol can be flexibly selected.

[0063] 4. It is convenient for on-site installation and eliminates on-site wiring errors.

[0064] No other power supply device needs to be connected on site. Once the outdoor high-voltage vacuum circuit breaker is hoisted, the construction is completed. The construction period is short, and the power-off time is reduced. All secondary wiring is completed in the factory to reduce the risk of on-site wiring errors.

[0065] 5. It has a current transformer open circuit safety protection design.

[0066] The outgoing line of all high-voltage current transformers is converted and processed by a secondary current sensor in the base. When the intelligent measurement and control terminal is not installed, the risk of high-voltage current transformer mis-opening is not considered, reducing the risk of on-site construction misoperation accidents.

[0067] 6. It adopts a fully enclosed structure with good insulation performance.

[0068] It adopts a three-phase pillar type fully enclosed structure with good sealing performance, moisture and condensation resistance, and is especially suitable for use in cold or high-temperature and humid areas. The three-phase pillar has increased silicon rubber umbrella skirts inside and outside, greatly increasing the creepage distance, and the phase spacing is 300 mm, meeting the requirements for use in areas below an altitude of 3000 meters.

[0069] 7. Live working function.

[0070] This system architecture also facilitates FTU upgrades and updates. FTU1, installed atop the tower, is responsible for data acquisition and protection, so upgrades are rare. FTU2, which contains software related to human-computer interaction and communications, is located mid-tower, making upgrades and updates more convenient. Furthermore, FTU1 supports live plug-in removal and replacement.

[0071] This on-site digital pole-mounted circuit breaker primary and secondary integration system deeply integrates primary equipment with secondary terminal equipment. It is mainly divided into two parts: the primary switch (including FTU1) and the human-machine interaction terminal with FTU2 as the core. FTU1 is mainly responsible for basic functions such as data acquisition and processing, relay protection, etc.; FTU2 is mainly responsible for human-machine interaction, communication and other functions that need to be frequently changed according to customer needs. Compared with traditional primary and secondary integration systems, this system has the following significant technical advantages:

[0072] 1. It can completely avoid the long-distance transmission problem of analog signals or sampled value digital messages and improve the reliability of the system;

[0073] 2. The only connection between the primary and secondary systems is the power supply and communication cables, which results in a higher degree of integration and completely solves the problem of mismatched interfaces and poor interchangeability between the primary and secondary equipment.

[0074] 3. On-site digitization enables accuracy and dynamic range to better support line loss calculation and single-phase grounding fault detection needs

[0075] 4. The opening and closing control is integrated into the switch body, which shortens the opening and closing time and improves the response speed.

[0076] 5. Solved the problems of remote signal jitter and equipment condensation.

[0077] 6. Solved the problems of primary and secondary equipment linkage testing, and cumbersome material bidding management.

[0078] 7. Compared with the digitalization of ADMU, it reduces the encoding and decoding links, uses fewer electronic circuits, fewer connecting cables and aviation plugs, and is therefore more economical and environmentally friendly.

[0079] like Figures 3 to 6 As shown, the MCU is preferably a smart chip of model MK64FX512VLQ12;

[0080] Also included are chips Y1, U24, U29, and U31;

[0081] Among them, pins 2 and 3 of Y1 are connected to the positive pole of the power supply and the CLKO interface of the smart chip respectively, and pin 4 of Y1 is connected to one end of C150, C151, and FB1. The other ends of C150 and C151 are connected to the positive pole of the power supply, and the other end of FB1 is 3V3-D.

[0082] Wherein, 3 foot of U24 is connected with C139 and one end of BT1, the other end of C139 and BT1 is connected with 4 foot of U24 and positive power supply, 5, 6 foot of U24 is connected with RTC-SDA, RTC-SCL foot of smart chip respectively, 7 foot of U24 is connected with one end of R160, R159, the other end of R160 is connected with 3V3-D, the other end of R159 is connected with RTC-INT foot of smart chip, 8 foot of U24 is connected with 3V3-D, one end of C138, the other end of C138 is connected with positive power supply.

[0083] Wherein, 1 foot of U29 is connected with one end of R182 and JTAG-VREF foot of smart chip, the other end of R182 is connected with positive power supply, 2 foot of U29 is connected with GPIO-WDI foot of smart chip, 3 foot of U29 is connected with positive power supply, 4 foot of U29 is connected with 6 foot of U31, 5 foot of U29 is connected with 3V3-D and one end of C163, the other end of C163 is connected with positive power supply.

[0084] Wherein, 1 foot of U31 is connected with one end of R195, the other end of R195 is connected with 8 foot of U31 and one end of R189, the other end of R189 is connected with 3V3-D, 2 foot of U31 is connected with 3V3-D and one end of C168, the other end of C168 is connected with positive power supply, 3 foot of U31 is connected with positive power supply, 7 foot of U31 is connected with one end of R197, the other end of R197 is connected with one end of R190 and HW-RST foot of smart chip, the other end of R190 is connected with 3V3-D.

[0085] The above is only the preferred embodiment of the present application, and is not limited to the implementation and protection scope of the present application, and for those skilled in the art, it should be realized that the equivalent replacement and obvious changes obtained by the application of the present application and the drawings should be included in the protection scope of the present application.

Claims

1. A digitalizing on-site pole-mounted circuit breaker primary and secondary fusion system, characterized in that, Comprise: 10KV switch body, capacitor power supply digital controller FTUI, man-machine interaction equipment FTU2; Among them, 10KV switch body includes capacitor power supply device, action mechanism, ECT4 way, EVT4 way; Among them, capacitor power supply digital controller FTUI includes MCU; The MCU includes fault protection logic, recording function, data storage, time, residual voltage detection, line loss calculation, remote signaling and remote control function; The capacitor power supply device supplies power for MCU through power module; The action mechanism is electrically connected with MCU, and the output of ECT4 way and EVT4 way is sent to MCU after processing; The man-machine interaction equipment FTU2 includes man-machine interaction function, 485 communication module, and 485 communication module is connected with MCU signal through 485 isolation sending module.

2. The on-site digitized pole-mounted circuit breaker primary and secondary fusion system according to claim 1, characterized in that, The MCU controls the action mechanism through 3-way remote control to open and close and store energy, and the open / close / energy storage position of the action mechanism is input to the MCU after being processed by the remote signaling processing circuit.

3. The on-site digitized pole-mounted circuit breaker primary and secondary fusion system of claim 1, wherein, The 4-way output of IA, IB, IC and IO of ECT4 way is sent to MCU through high-precision ADC after current signal processing.

4. The on-site digitized pole-mounted circuit breaker primary and secondary fusion system of claim 1, wherein, The 4-way output of UA, UB, UC and UO of EVT4 way is sent to MCU through high-precision ADC after impedance conversion and voltage signal processing.

5. The on-site digitized pole-mounted circuit breaker primary and secondary fusion system of claim 1, wherein, The man-machine interaction equipment FTU2 further includes backup power supply, which provides direct current power supply for 10KV switch body and capacitor power supply digital controller FTUI.

6. The on-site digitized pole-mounted circuit breaker primary and secondary fusion system of claim 5, wherein, The man-machine interaction equipment FTU2 further includes Beidou / GPS receiver.

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