CN106785982A - A kind of high-tension switch gear - Google Patents

Abstract

The invention relates to a high-voltage switchgear and belongs to the technical field of high-voltage switchgear monitoring. In the present invention, an intelligent unit packaged in a casing is arranged in the high-voltage switch mechanism box, and the intelligent unit includes a microprocessor, a power circuit connected to the microprocessor, a switching value input circuit, a sensor input circuit, and an opening and closing control output circuit. , The motor control output circuit and the communication circuit directly process a large number of signals that need to be transmitted to the control cabinet. The invention simplifies the connection between the high-voltage switch mechanism and the control cabinet, shortens the assembly and debugging time, and The substation site is not easily disturbed by overvoltage.

Description

A high voltage switchgear

technical field

The invention relates to a high-voltage switchgear and belongs to the technical field of high-voltage switchgear monitoring.

Background technique

As the core equipment of the substation, high-voltage switchgear is organically combined with components such as circuit breakers, disconnectors, grounding switches, transformers, lightning arresters, and incoming and outgoing line terminals. The control cabinet is connected using cables. At present, a large number of cables need to be connected between the high-voltage switchgear mechanism of 110kV and above voltage level and the control cabinet. These cables must be laid through cable trenches or cable trays provided by users, and these cable trenches or cable trays are generally set on the ground. Under the circumstances, assembly in the workshop and on-site construction require a lot of labor, and it is difficult to troubleshoot after a problem occurs. It is easy to be affected by overvoltage at the substation site, resulting in misoperation or damage to the secondary equipment in the control cabinet.

Contents of the invention

The purpose of the present invention is to provide a high-voltage switchgear to solve the problem of difficulty in troubleshooting due to the connection between the high-voltage switchgear mechanism and the control cabinet through a large number of cables.

In order to solve the above technical problems, the present invention provides a high-voltage switchgear. Solution 1: It includes a high-voltage switchgear body, an operating mechanism, a sensor acquisition module, and a switching value acquisition module arranged on the high-voltage switchgear body. The high-voltage switchgear body There is also an intelligent unit packaged in a casing, and the casing is grounded, the intelligent unit includes a microprocessor, a power supply circuit, a switch input circuit, a sensor input circuit, a control output circuit and a communication circuit. The communication circuit is used to realize the communication between the microprocessor and the upper equipment or the control cabinet. The power supply circuit is connected to the microprocessor. Connect with the microprocessor, the input end of the sensor input circuit is connected with the output end of the sensor acquisition module, the output end of the sensor input circuit is connected with the microprocessor, the input end of the control output circuit is connected with the microprocessor, and the output of the control output circuit Terminal control connection operating mechanism.

Scheme 2: On the basis of Scheme 1, the power supply circuit includes an energy storage circuit and a battery, the energy storage circuit is connected to the high-voltage current energy-taking coil of the high-voltage switch, and the energy storage circuit and the battery form a seamless switching power supply circuit .

Solution 3: On the basis of solution 1 or 2, the communication circuit includes a wireless communication module or an optical fiber communication module, and the microprocessor is connected to the wireless communication module or the optical fiber communication module through the serial port communication module.

Solution 4: On the basis of solution 1 or 2, the communication circuit also includes an RS232 module, and the microprocessor is connected to the local debugging device of the high-voltage switch through the RS232 module to receive the setting parameters of the local debugging device.

Scheme 5: On the basis of Scheme 1 or 2, the control output circuit includes an opening and closing control output branch, a motor control output branch and a temperature control output branch. The opening and closing control output branch adopts IGBT, and the motor Both the control output branch and the temperature control output branch use solid-state relays.

Scheme 6: On the basis of Scheme 5, the control output circuit is also equipped with a photoelectric isolation module, one end of the photoelectric isolation module is connected to the microprocessor, and the other end is respectively connected to the opening and closing control output branch and the motor control output Branch and temperature control output branch connection.

Scheme 7: On the basis of scheme 1 or 2, the switch input circuit is provided with a photoelectric isolation module, one end of the photoelectric isolation module is connected to the microprocessor, and the other end is connected to the switch acquisition module.

Scheme 8: On the basis of Scheme 7, a limiting diode module is also arranged between the photoelectric isolation module and the switch value acquisition module.

Scheme 9: On the basis of scheme 1 or 2, the sensor input circuit includes an A/D conversion module, the digital signal terminal of the A/D conversion module is connected to the microprocessor, and the analog signal terminal of the A/D conversion module It is connected with the output end of the sensor acquisition module.

Solution ten: On the basis of solution nine, the sensor input circuit further includes a filter conditioning circuit, and the filter conditioning circuit is set between the analog signal terminal of the A/D conversion module and the output terminal of the sensor acquisition module.

Scheme 11: On the basis of Scheme 1 or 2, the intelligent unit also includes an opening and closing indicating circuit, and the opening and closing indicating circuit and a microprocessor are used to display the operating position of the high-voltage switch.

Scheme 12: On the basis of scheme 11, the opening and closing indication circuit includes an opening LED and a closing LED, and both the opening LED and the closing LED are connected to the microprocessor through a D flip-flop.

Scheme 13: On the basis of scheme 2, the high-voltage switchgear also includes a primary current and voltage acquisition module, which is connected to the microprocessor of the intelligent unit.

Solution 14: On the basis of solution 1 or 2, the intelligent unit further includes a clock circuit connected to the microprocessor, which is used to provide a clock signal for the microprocessor.

Solution fifteen: On the basis of solution one or two, the microprocessor is an FPGA.

The beneficial effects of the present invention are: the present invention is provided with the intelligent unit that is encapsulated in a casing in the high-voltage switchgear box, and the intelligent unit comprises a microprocessor and a power supply circuit connected with the microprocessor, a switching value input circuit, and a sensor input circuit , opening and closing control output circuit, motor control output circuit and communication circuit, and directly process a large number of signals that need to be transmitted to the control cabinet. The invention moves the monitoring and control functions in the control cabinet to the mechanism box, simplifies the connection between the high-voltage switch mechanism box and the control cabinet, shortens the assembly and debugging time, and is not easily disturbed by overvoltage at the substation site.

In addition, the smart unit adopts a seamlessly switched power supply circuit composed of an energy harvesting circuit and a battery to avoid the influence of electromagnetic interference coupled by the power line on the smart unit.

Description of drawings

Fig. 1 is the structural block diagram of the intelligent unit in the high-voltage switchgear of the present invention;

Fig. 2 is a working flow chart of the high voltage switchgear of the present invention.

detailed description

The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

The high-voltage switchgear of the present invention cancels the cable between the high-voltage switchgear and the control cabinet, and concentrates the monitoring and control functions arranged in the control cabinet into the mechanism box, that is, the intelligent unit with monitoring and control functions is arranged in the mechanism box, which is just Realize the digitalization and uploading of switch value status information, sensor monitoring information, and control of the operating mechanism, saving a lot of cables and improving assembly efficiency.

The high-voltage switchgear of the present invention includes an operating mechanism, a sensor acquisition module, a switching value acquisition module and an intelligent unit arranged in the high-voltage switch mechanism box. Since the intelligent unit is arranged in the high-voltage switch mechanism box, the environment is worse than the control cabinet, so The intelligent unit needs to be packaged in a housing, and the housing can be reliably grounded; at the same time, in order to further reduce the influence of electromagnetic interference, vibration and other external environments on the intelligent unit, the intelligent unit is suspended in the high-voltage switch mechanism box.

Specifically, as shown in Figure 1, the intelligent unit in this embodiment includes a microprocessor and a power circuit connected to the microprocessor, a switch input circuit, a sensor input circuit, a control output circuit, a motor control output circuit, a temperature control Output circuit, communication circuit, opening and closing indication circuit, clock circuit and memory. The input end of the switch value input circuit is connected with the output end of the switch value acquisition module, the output end of the switch value input circuit is connected with the microprocessor, the input end of the sensor input circuit is connected with the output end of the sensor acquisition module, and the output end of the sensor input circuit The terminal is connected with the microprocessor, the input terminal of the opening and closing control output circuit is connected with the microprocessor, and the output terminal of the opening and closing control output circuit is connected with the operating mechanism.

In order to reduce the impact of interference signals on the normal operation of the intelligent unit through the coupling mode of the power line, the power supply circuit of the present invention uses a battery and an energy harvesting circuit connected to the high voltage switch energy harvesting coil, and the battery and the energy harvesting circuit constitute a power supply circuit for seamless switching; When the primary current is less than 5% In, the working power of the microprocessor is provided by the battery. When the primary current is greater than 5% In, the working power of the device is provided by the energy-taking coil of the high-voltage switch through the energy-taking circuit. In is the rated current of the primary circuit. The two power supply methods can realize seamless switching, and the intelligent unit is in a low power consumption state when the high-voltage switch is not operating.

In order to further reduce the interference to signal transmission, the intelligent unit in the present invention uses wireless or optical fiber to communicate with the upper equipment or the secondary equipment in the control cabinet, that is, the communication circuit adopts a wireless communication module or an optical fiber communication module, and the microprocessor communicates through an RS485 circuit. Connect with a wireless communication module or an optical fiber communication module (including a photoelectric conversion module), convert the signal to be transmitted into a wireless signal or an optical signal, realize wireless or optical fiber communication between the microprocessor and the upper device, and reduce conduction interference when using signal lines . In addition, the high-voltage switchgear is also equipped with local debugging equipment, the microprocessor is connected to the debugging equipment through the RS232 circuit, and the staff can set the operating parameters of the intelligent unit through the debugging equipment.

In order to reduce the interference to the microprocessor in the intelligent unit, the control output circuit in the intelligent unit of the present invention is provided with a photoelectric isolation module. Since the operating mechanism includes not only the opening and closing equipment of the high-voltage switch, but also the motor and temperature adjustment equipment, correspondingly, the control output circuit includes the opening and closing control output branch, the motor control output branch and the temperature control output branch. The closing control branch, the motor control branch and the temperature control branch are all connected with the microprocessor through the photoelectric isolation module. The control of the high-voltage switch by the power grid requires fast response and small delay. The opening and closing control output branch in the control output circuit adopts IGBT, that is, the microprocessor drives the opening and closing IGBT through the photoelectric isolation module to perform opening and closing operations; The motor and temperature regulation equipment have lower requirements on the response speed, and the motor control output branch and the temperature control output branch both use solid-state relays. The intelligent unit receives the opening and closing operation instructions sent by the upper equipment, and after being processed by the microprocessor, it drives the corresponding IGBT through the photoelectric isolation module to realize the opening and closing operation of the high-voltage switch; when the energy storage is lower than the set value, the microprocessor The start-up of the energy storage motor is controlled by the photoelectric isolation module and the solid-state relay to start energy storage.

The switching value status signals collected by the switching value acquisition module include local opening and closing switch signals, opening and closing status signals, energy storage status signals, air pressure locking status signals, oil pressure locking status signals, etc. These status signals are based on logic "1 " or logic "0", the signal may be in the form of voltage, current or switch contacts. Under abnormal conditions, these signals may cause interference such as instantaneous high voltage, over-current, contact jitter and noise. In order to reduce The interference of the above-mentioned switch signal to the microprocessor in the intelligent unit, the switch input circuit in the intelligent unit of the present invention is provided with a photoelectric isolation module, and the microprocessing is connected with the switch acquisition module arranged on the high-voltage switch body through the photoelectric isolation module . At the same time, in order to further reduce the interference caused by overvoltage, a limiting diode is also arranged between the switch value acquisition module and the photoelectric isolation module, and the limiting diode here can be a fast recovery diode.

The sensor acquisition module includes a vibration sensor, stroke sensor, small current sensor, gas state sensor, oil pressure sensor and temperature and humidity sensor. The sensor input circuit is used to process the above sensor signals and input them into the microprocessor. The processing here mainly refers to It is filtering and A/D conversion. Therefore, the sensor input circuit includes a filter conditioning circuit and an A/D conversion circuit connected in sequence. The input end of the filter conditioning circuit is connected to the above sensor, and the output end of the filter circuit is connected to the A/D conversion circuit. The input end is connected, and the output end of the A/D conversion circuit is connected with the input end of the microprocessor. In this embodiment, the output of the gas state sensor is an analog signal. If the output is a 485 signal, the gas state sensor can be directly connected to the microprocessor through the RS485 circuit.

The travel sensor, small current sensor and vibration sensor are used to monitor the mechanical characteristics and acoustic fingerprint information of the high-voltage switch, and the collected waveform data is input to the intelligent unit through the sensor input circuit for local processing and storage, and the intelligent unit communicates with the stored expert library to judge whether there is a mechanical failure, and if it is judged to be there, the judgment result will be sent to the upper-level equipment in time; The data is returned to the superior device. The oil pressure sensor is used to monitor the oil pressure of the hydraulic mechanism. The microprocessor judges according to the received oil pressure signal. When it is lower than the set value, the oil pump motor starts to store energy; when the oil pressure reaches the rated value, the oil pump motor stops. run. The gas state sensor is used to monitor the high pressure switch SF ₆ gas pressure, density, temperature, humidity and micro-water. The microprocessor judges according to the above-mentioned signals received. When the warning value is exceeded, an alarm message is sent to the upper equipment. In addition, the intelligent unit of the mechanism can be connected to the primary current and voltage signal of the transformer, combined with mechanical characteristics and control information, to realize the electrical life monitoring of the high-voltage switch.

The opening and closing indication circuit is used to indicate the operating position of the opening and closing switch, and is provided with an opening LED and a closing LED, and both the opening LED and the closing LED are connected to the microprocessor through a D flip-flop. Specifically, the opening LED and the closing LED are set on the panel of the intelligent unit of the mechanism. The "point position" light is green, and it is lit when the switch moves to the point position; the "close position" light is red light, and when the switch moves to the close position light up.

The intelligent unit is also equipped with a clock module and a memory, and the clock module supports IRIG-B code and IEEE1588 time synchronization mode, which is used for time label and system time correction. The memory adopts E2PROM, which is used for the signals collected by the microprocessor. The microprocessor adopts FPGA chip, which has fast information processing speed and strong anti-interference ability.

The microprocessor in the mechanism intelligent unit of the present invention adopts an embedded software system, including operating parameters, communication, sensor signal acquisition, data processing and analysis, power supply management, opening and closing control, motor control, status indication and operation log etc. ,as shown in picture 2.

The present invention cancels the cable between the high-voltage switchgear mechanism and the control cabinet, and installs an intelligent unit on the high-voltage switchgear body to process the signals that originally need to be transmitted to the control cabinet for processing on-site, so as to realize the intelligentization of the high-voltage switchgear mechanism and on-site Realize on-site digitalization and uploading of switching status information such as opening and closing status, energy storage status, and air pressure lock status; analyze and process signals from sensors such as vibration sensors, stroke sensors, and small current sensors on site, and upload the analysis results To the upper-level equipment, realize the monitoring of the mechanical characteristics, oil pressure state, and gas state of the high-voltage switch; at the same time, the intelligent unit can receive the opening and closing instructions of the upper-level equipment to operate the high-voltage switch, and the working power is provided by the high-voltage current energy-taking coil or battery , reducing the influence of electromagnetic interference coupled by the power line on the smart unit.

Claims (15)

1. A high-voltage switchgear, comprising a high-voltage switchgear box arranged on the high-voltage switchgear body, an operating mechanism, a sensor acquisition module and a switching value acquisition module are arranged in the high-voltage switchgear box, it is characterized in that the high-voltage switchgear The switch mechanism box is also provided with an intelligent unit packaged in a casing, and the casing is grounded. The intelligent unit includes a microprocessor, a power supply circuit, a switch value input circuit, a sensor input circuit, a control output circuit and a communication circuit. The communication circuit is used to realize the communication between the microprocessor and the upper equipment or the control cabinet. The power supply circuit is connected to the microprocessor. The output end of the sensor input circuit is connected with the microprocessor, the input end of the sensor input circuit is connected with the output end of the sensor acquisition module, the output end of the sensor input circuit is connected with the microprocessor, the input end of the control output circuit is connected with the microprocessor, and the control output The output terminal of the circuit controls the connection operating mechanism. 2. The high-voltage switchgear according to claim 1, wherein the power supply circuit includes an energy storage circuit and a battery, the energy storage circuit is connected to the high-voltage current energy-taking coil of the high-voltage switch, and the energy storage circuit and the battery Form a power supply circuit for seamless switching. 3. The high-voltage switchgear according to claim 1 or 2, wherein the communication circuit includes a wireless communication module or an optical fiber communication module, and the microprocessor is connected to the wireless communication module or the optical fiber communication module through a serial port communication module. 4. The high-voltage switchgear according to claim 3, wherein the communication circuit also includes an RS232 module, and the microprocessor is connected to the local debugging device of the high-voltage switch through the RS232 module, and is used to receive the setting parameters of the local debugging device . 5. The high-voltage switchgear according to claim 1 or 2, wherein the control output circuit includes an opening and closing control output branch, a motor control output branch and a temperature control output branch, and the opening and closing control The output branch adopts IGBT, and the motor control output branch and temperature control output branch both adopt solid state relays. 6. The high-voltage switchgear according to claim 5, wherein the control output circuit is also provided with a photoelectric isolation module, one end of the photoelectric isolation module is connected to the microprocessor, and the other end is respectively connected to the opening and closing control The output branch, the motor control output branch and the temperature control output branch are connected. 7. The high-voltage switchgear according to claim 1 or 2, characterized in that, the switch input circuit is provided with a photoelectric isolation module, one end of the photoelectric isolation module is connected to the microprocessor, and the other end is connected to the switch input circuit. connected to the acquisition module. 8. The high-voltage switchgear according to claim 7, characterized in that, a limiting diode module is also arranged between the photoelectric isolation module and the switch quantity acquisition module. 9. The high-voltage switchgear according to claim 1 or 2, wherein the sensor input circuit includes an A/D conversion module, the digital signal terminal of the A/D conversion module is connected to the microprocessor, and the A/D The analog signal end of the D conversion module is connected with the output end of the sensor acquisition module. 10. The high-voltage switchgear according to claim 9, characterized in that, the sensor input circuit also includes a filter conditioning circuit, and the filter conditioning circuit is arranged on the analog signal terminal of the A/D conversion module and the sensor acquisition module between the output terminals. 11. The high-voltage switchgear according to claim 1 or 2, wherein the intelligent unit further includes an opening and closing indication circuit, and the opening and closing indication circuit and a microprocessor are used to display the high-voltage switch run location. 12. The high-voltage switchgear according to claim 11, wherein the opening and closing indication circuit includes an opening LED and a closing LED, and both the opening LED and the closing LED are connected to the microprocessor through a D flip-flop. 13. The high-voltage switchgear according to claim 2, characterized in that, the high-voltage switchgear further comprises a primary current and voltage acquisition module, and the primary current and voltage acquisition module is connected with the microprocessor of the intelligent unit. 14. The high-voltage switchgear according to claim 1 or 2, wherein the intelligent unit further comprises a clock circuit connected to the microprocessor, for providing a clock signal for the microprocessor. 15. The high-voltage switchgear according to claim 1 or 2, wherein the microprocessor is an FPGA.