CN106549368B - Software protection method for intelligent IED control switch cabinet - Google Patents

Abstract

The invention discloses a software protection method of an intelligent IED control switch cabinet, which comprises an MCU, a human-computer interface, a control execution unit, a display unit, a communication unit and a conversion circuit which are integrated on the same equipment shell, wherein the acquisition unit is connected with the MCU through the conversion circuit which can convert an acquired signal into MCU identification, the MCU is also electrically connected with the human-computer interface and the communication unit respectively, and the human-computer interface is electrically connected with the control execution unit and the display unit respectively. The invention has perfect comprehensive protection function, meets the operation requirements of different projects, integrates the on-line monitoring, control, protection and communication of the state of the switch cabinet into a whole, and avoids the problems of repeated signal acquisition, complicated wiring and the like.

Description

A software protection method for intelligent IED control switchgear

technical field

The invention relates to an intelligent electronic device (IED), in particular to a software protection method for an intelligent IED to control a switch cabinet.

Background technique

The instrument room of the existing switchgear generally has integrated protection device + digital display instrument + intelligent control device + wireless temperature measurement device + temperature and humidity controller + three-phase live display + electric chassis vehicle control module + electric floor knife control module, the above equipment Independent and large in number, the results are: 1. The instrument room of the switchgear is large, making it impossible to miniaturize the switchgear; 2. There are many secondary cables, the wiring workload is large, and there are many fault points; 3. The hardware configuration is repeated, Each device needs to be equipped with a power module, communication module, CPU, housing, and display screen, resulting in waste of hardware costs; 4. Repeated collection and processing of signals, switching signals, and remote measurement lights; 5. Diversified communication interfaces, communication between manufacturers The protocol is not fully compatible; 6. The equipment interoperability is poor, and the operation methods and interfaces of equipment from different manufacturers are inconsistent, which brings inconvenience to on-site maintenance.

Based on the above problems, there is an urgent need for a solution that can not only cover all required functions, but also highly integrate various devices, and this kind of integration cannot be a simple superposition of building blocks, but to remove duplicate components and achieve functional integration.

Contents of the invention

In order to solve the above technical problems, the object of the present invention is to provide a software protection method for an intelligent IED control switch cabinet.

The technical scheme adopted in the present invention is:

A software protection method for an intelligent IED controlling a switch cabinet. The intelligent IED includes an MCU, a man-machine interface, a control execution unit, a display unit, a communication unit, and a conversion circuit integrated on the same equipment shell. The acquisition unit can convert the acquisition signal into The conversion circuit identified by the MCU is connected to the MCU, and the MCU is also electrically connected to the man-machine interface and the communication unit, and the man-machine interface is respectively electrically connected to the control execution unit and the display unit; the software protection method includes a vacuum circuit breaker Monitoring mode: the abscissa is the effective accumulated value of the breaking current collected by the acquisition unit (1) when the protection function is triggered, and the number of opening and closing operation cycles is the ordinate, and the circuit breaker rated value is set on the man-machine interface (3). The current and rated mechanical life opening and closing times are taken as the first inflection point, and the circuit breaker’s rated short-circuit withstand current and rated short-circuit current breaking times are taken as the second inflection point; the MCU (2) makes a logical judgment: When it is within the interval range, it indicates that the electrical life of the circuit breaker is normal. When the action value is at the edge of the interval or outside the interval, it indicates that the contacts of the circuit breaker are severely worn. The display unit (5) or communication unit (6) reminds the maintenance personnel to perform maintenance in time.

The software protection method also includes a switch cabinet arc protection mode: the intelligent IED accesses several light signals from the arc sensor and the current value from the electronic current transformer, and when an arc or current increment of a specific intensity is detected When a trip command is issued, the action criterion is set as follows according to the different protection devices: Arc and Current Components: A trip signal is issued when both arc and overcurrent are detected. Arc light component: When a certain intensity of arc light is detected, a trip signal is issued. Overcurrent component: A trip signal is issued when an overcurrent is detected.

Further, the acquisition unit includes a temperature sensor (wireless or optical fiber), a temperature and humidity sensor, a charging sensor, a switching value sensor, an energy storage current transformer, an opening and closing circuit current transformer, an electric ground knife motor current transformer, and an electric chassis Vehicle motor current transformers, electronic current transformers, electronic voltage transformers and arc sensors.

Further, the conversion circuit includes an analog-to-digital converter and a Hall sensor to match different types of acquisition units.

Further, the control execution unit includes an electric ground knife control unit, an electric chassis vehicle control unit, a circuit breaker control unit, and a temperature and humidity control unit.

Further, the display unit is used to display the primary main wiring diagram of the switchgear, three-phase live data, electrical quantity, temperature data, SOE and remote control record data, and alarm information.

Further, the communication unit includes an RS485 interface, a CAN interface, a network port and a WiFi module.

Beneficial effects of the present invention:

(1) It not only has a perfect comprehensive protection function to meet the operation needs of different projects; it also has an arc protection function to quickly remove faults and reduce arc hazards.

(2) Highly integrated. Integrate on-line monitoring, control, protection and communication of switchgear status to avoid problems such as repeated signal collection and complicated wiring.

(3) Electronic transformers are used to replace traditional electromagnetic transformers, which make up for the shortcomings of electromagnetic transformers such as large volume and magnetic saturation. Not only analog inputs can be input, but digital inputs can also be selected.

(4) The hardware design of the main IED adopts power isolation, and the shell is made of metal. Effective measures are taken to improve the anti-interference ability of the equipment in the environment of strong electromagnetic interference with high current and high voltage.

(5) Real-time online monitoring. Upload all data to the remote end in real time through communication, view the data in real time on the PC/mobile phone, and perform remote control according to the data analysis results; realize flexible remote/local control of circuit breakers, electric chassis vehicles, and electric grounding switches Control, truly realize unattended, reduce maintenance intensity and maintenance costs.

(6) Modular design, each functional module can be selected according to user needs.

(7) A variety of communication protocols are optional, meeting the IEC61850 (MMS and Goose) standard.

Description of drawings

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

Fig. 1 is a functional block diagram of an intelligent electronic device of the present invention.

Detailed ways

Referring to Fig. 1, it is an intelligent IED control switchgear based on the present invention, including MCU2, man-machine interface 3, control execution unit 4, display unit 5, communication unit 6 and conversion circuit integrated on the same equipment shell 7. The acquisition unit 1 is connected to the MCU2 through a conversion circuit 7 that can convert the acquisition signal into an identification of the MCU2. The MCU2 is also electrically connected to the man-machine interface 3 and the communication unit 6. The man-machine interface 3 is respectively connected to the control execution The unit 4 and the display unit 5 are electrically connected.

Wherein, the acquisition unit 1 includes a temperature sensor (wireless or optical fiber), a temperature and humidity sensor, a charging sensor, a switching value sensor, an energy storage current transformer, a current transformer for opening and closing circuits, an electric ground knife motor current transformer, an electric Chassis car motor current transformer, electronic current transformer, electronic voltage transformer and arc sensor, collect temperature and humidity signals from temperature and humidity sensors, temperature signals from temperature sensors, live information, circuit breakers, handcarts, ground knives, etc. Switching value, current, voltage, opening and closing circuit, energy storage motor, electric ground knife, electric chassis motor current and other data are sent to the micro control unit MUC 2.

In order to match the different sensors of the above acquisition unit, the conversion circuit 7 includes an analog-to-digital converter and a Hall sensor to match different types of acquisition units 1, wherein the opening and closing circuit current transformer, electric ground knife motor current transformer, The motor current transformer of the electric chassis vehicle is converted by a Hall sensor, and the others are converted by an analog-to-digital converter.

After the micro control unit MCU2 integrates, analyzes and processes the data, it interacts with the man-machine interface 3 for data. The micro control unit MCU 2 displays telemetry and telesignal data on the man-machine interface 3 in real time through data processing, and receives operation instructions on the man-machine interface 3 to perform corresponding actions. Wherein, the control execution unit 4 includes an electric ground knife control unit, an electric chassis vehicle control unit, a circuit breaker control unit, and a temperature and humidity control unit, and the electric ground knife control unit and the electric chassis vehicle control unit respectively correspond to specific motor drivers, The circuit breaker control unit corresponds to the opening and closing coil of the circuit breaker to control the opening and closing of the circuit breaker, and the temperature and humidity control unit uses heaters and fans to adjust the temperature and humidity of the switch cabinet.

An important point of this technical solution is that the service life of the vacuum circuit breaker is a combination of mechanical life and electrical life. The mechanical life focuses on the ability of mechanical action, and the mechanical life is relatively long, which can reach more than 10,000 times. The electrical life is the electrical breaking capacity of the vacuum circuit breaker, usually expressed by the breaking times of the rated short-circuit breaking current. Due to the ablation of the contacts by the powerful arc, the electrical life of the vacuum circuit breaker is only dozens of times. Generally speaking, the electrical life of a vacuum circuit breaker determines its real service life. If the electric life is exceeded, the vacuum interrupter will fail, the arc cannot be disconnected, and the interrupter may explode, causing major accidents. Therefore, the monitoring and evaluation of its electrical life is very necessary.

Therefore, the main invention of this technical solution lies in: using the effective accumulated value of the breaking current when triggered by the protection function and the curve of opening and closing operation cycles as the basis for monitoring the electrical life of the circuit breaker, the effective breaking current when triggered by the protection function The accumulative value is the abscissa, the number of opening and closing operation cycles of the circuit breaker is the ordinate, the rated current of the circuit breaker, the number of times of opening and closing of the rated mechanical life are taken as the first inflection point, the rated short-circuit withstand current of the circuit breaker, and the number of breaking times of the rated short-circuit current as the second inflection point. The values of the above parameters for different models of circuit breakers from different manufacturers may be different, which need to be given by the circuit breaker manufacturer after repeated tests. The above parameters can be set in the intelligent IED. When the action value of the circuit breaker is within the interval range, it indicates that the electrical life of the circuit breaker is normal. When the action value is at the edge of the interval or outside the interval, it indicates that the contacts of the circuit breaker are severely worn, and the maintenance personnel are reminded to perform maintenance in time.

The main IED collects the temperature sensor data of 6 points of the circuit breaker contact, 3 points of the busbar lap, and 3 points of the cable connection through the 433MHz wireless signal or optical fiber. The temperature value and temperature curve of each point can be displayed in real time through the intelligent IED. Users can set the temperature alarm limit of each point through the main IED, intelligent IED cluster analysis, fuzzy judgment, provide switch joint temperature warning information, and record alarm data, which can effectively warn of temperature rise and fire accidents.

In terms of control of electric floor knives and electric chassis vehicles: from the perspective of operator safety, the complete electric operation of the handcart in and out and the grounding switch in the two modes of remote and local modes is realized, and the original manual function is retained. , breaking through the bottleneck of the traditional switchgear that can only be completed by manpower on the ground switch opening and closing operation and handcart in and out operation.

In the local mode, the user can make the electric chassis vehicle complete the entry and exit operation between the working position and the test position or complete the opening and closing operation of the ground knife through the intelligent IED. The failure should be dealt with in time (stop or return to the original position).

In the remote mode, the user can directly control the opponent car or the ground knife through the remote control. Due to the different specifications and models of the chassis and floor knives, in order to ensure the versatility of the product and the convenience of manual and electric switching, the setting page of the main IED provides the setting of the motor operating parameters, which can be adjusted according to different situations. adjustment.

This technical solution also has a complete comprehensive protection function, which is suitable for different application occasions such as lines, transformers, motors, capacitors, bus couplers, and PT cabinets. Provide 15 sets of independently set protection customization to apply to various operating conditions on site.

In addition, this technical solution has improvements in arc light protection: arc light sensors are installed in the switch cabinet busbar room and cable room to detect arc light signals in the switch cabinet. The working range of the sensor: -40~+70°C, the length of the optical fiber can be customized, and the installation is simple and stable.

Intelligent IED can access several light signals from arc sensor and current value from current transformer, and send trip command (jump into line or feeder) when detecting arc light or current increment of specific intensity, according to protection equipment different, the action criterion can be set as: Arc and current components; trip signal is issued when both arc and overcurrent are detected. Arc component; a trip signal is issued when an arc of a certain intensity is detected. Overcurrent component; trip signal is issued when overcurrent is detected. These three protection logics can be realized in the intelligent IED at the same time.

In terms of display, the intelligent IED adopts LCD full-color touch screen, which can not only dynamically and synchronously simulate the primary wiring diagram and various switch action states of the display switch, but also display various information of various analog quantities, switch quantities and digital quantities; especially It is possible to use the method of analog display to visually display the information of the mechanical positions of various switches and circuit breakers. It can also be distinguished by different colors and simulated to display the status of live, uncharged or grounded under the switch action.

In terms of communication, the communication unit 6 includes RS485 interface, CAN interface, network port and built-in WiFi module, supports Modbus RTU, Modbus Plus, IEC61850 (MMS and Goose), IEC60870-5-103\104 and other communication protocols, supports national Net/South Net data encryption function. It can be connected to the built-in Wi-Fi module through a mobile phone or a maintenance notebook, and can realize wireless parameter setting, operation data viewing, remote control operation, and data reading without power failure or opening the cabinet door, reducing operation and maintenance costs. As an intelligent IED applied to the substation bay layer, based on the new communication network and system protocol IEC61850, the intelligent equipment has good scalability and meets the needs of the future development of the substation automation system.

The above descriptions are only preferred implementations of the present invention, and the present invention is not limited to the above-mentioned implementations, as long as the technical solutions that achieve the purpose of the present invention by basically the same means fall within the protection scope of the present invention.

Claims (7)

1. a kind of method for protecting software of intelligence IED controls switchgear, intelligent IED include being integrated on same device housings MCU (2), man-machine interface (3), control execution unit (4), display unit (5), communication unit (6) and conversion circuit (7), are adopted Collection unit (1) is connect by the way that acquisition signal can be converted to the conversion circuit (7) of MCU (2) identifications with MCU (2), and the MCU (2) is also Respectively with man-machine interface (3), communication unit (6) be electrically connected, the man-machine interface (3) respectively with the control execution unit (4), Display unit (5) is electrically connected；It is characterized in that：The method for protecting software includes vacuum circuit breaker monitoring pattern：With by protecting The effective accumulated value of drop-out current that collecting unit (1) is acquired when function triggers is abscissa, circuit-breaker switching on-off operation circulation Number is ordinate, and breaker rated current, specified mechanical life divide-shut brake number are set in man-machine interface (3) as first A inflection point, breaker nominal short-circuit tolerance electric current, rated short circuit current open and close times are as second inflection point；MCU (2) is patrolled It collects and judges：Show that circuit breaker electrical endurance is normal when the working value of breaker is in interval range, when working value is at section edge Or show contact of breaker serious wear when outside section, remind service personnel timely by display unit (5) or communication unit (6) Maintenance.

2. a kind of method for protecting software of intelligence IED controls switchgear according to claim 1, it is characterised in that：Also wrap Include switchgear arc protection pattern：Intelligent IED accesses several optical signals and current transformer for being transmitted by arc photosensor Come current value, send out trip signal when the arc light or current increment for detecting certain strength, according to protection equipment difference, Operating criterion is set as：1. arc light and current component：Trip signal is just sent out when being detected simultaneously by arc light and overcurrent；2. arc light Component：Trip signal is sent out when the arc light for detecting certain strength；3. cross flow component：Tripping letter is sent out when detecting overcurrent Number.

3. a kind of method for protecting software of intelligence IED controls switchgear according to claim 1, it is characterised in that：It is described Collecting unit (1) includes temperature sensor, Temperature Humidity Sensor, electrified sensor, Boolean value output sensor, energy storage Current Mutual Inductance Device, divide-shut brake loop current mutual inductor, electronic earthing knife-switch current of electric mutual inductor, electric chassis truck current of electric mutual inductor, electronics Formula current transformer, electronic type voltage transformer and arc photosensor.

4. a kind of method for protecting software of intelligence IED controls switchgear according to claim 3, it is characterised in that：It is described Conversion circuit (7) is including analog-digital converter and Hall sensor to match different types of collecting unit (1).

5. a kind of method for protecting software of intelligence IED controls switchgear according to claim 1, it is characterised in that：It is described Control execution unit (4) includes electronic earthing knife-switch control unit, electric chassis truck control unit, circuit breaker control unit, humiture Control unit.

6. a kind of method for protecting software of intelligence IED controls switchgear according to claim 1, it is characterised in that：It is described Display unit (5) for the primary connection circuit figure of display switch cabinet, three-phase charged data, electrical quantity, temperature data, SOE with it is distant Control record data, warning information.

7. a kind of method for protecting software of intelligence IED controls switchgear according to claim 1, it is characterised in that：It is described Communication unit (6) includes RS485 interfaces, CAN interface, network interface and WiFi module.