1.1 overview
The electricity sector has always attached great importance to the safe operation of the power system, the power sector in 50 promulgated the "electrical safety regulations", the electricity sector has successively promulgated a variety of anti accident measures and regulations. To prevent the load ($) switch, prevent mistakenly charged interval, prevent misclassification ($) circuit breaker, to prevent electric wire grounding, prevent the ground wire knife switch measures, namely "five preventing lock". The prevent and misoperation device reliability is not high technical reasons, has not completely eliminate five misoperation malignant accidents. With the rapid development of computer coding technology, communication technology and control technology, microcomputer anti misoperation locking technology to obtain the considerable development, and has been more and more widely used in China, China State Grid Corp has also promulgated the "Regulations" preventing electrical misoperation locking device management, and promulgated: power plant, substation "by the computer monitoring system, remote operation on the spot shall have electrical five anti locking function, if has the pre operation function, rules also should have the function". To this end, Jiangsu XJ Electric Co. Ltd. in the original basis of microcomputer anti misoperation lockout operating system series launched a comprehensive anti error operating system series products of SWF2000 computer, the real implementation of the substation, power plant switch, knife switch, an equipment with microcomputer anti misoperation lockout, which prevent belt load knife switch (or push and pull the car), preventing mistakenly charged isolation, to prevent false closing switch, prevent electrified wire grounding ($grounding knife switch), to prevent the earth wire switch (knife switch).
Configuration 1.2 SWF2000 system
SWF2000 type microcomputer five protection system adopts hierarchical distributed architecture, composed of microcomputer anti misoperation locking computer, preventing electrical misoperation device, computer, printer etc.. The basic configuration system as shown in Figure 1-1. This system is available and the substation automation system as a whole, share a host, can also be relatively independent. When the five prevention operation and monitoring of extension, to add five prevention host, printer, mouse and UPS power supply equipment, the five prevention host and host monitor or data acquisition system RTU to serial port or Ethernet networks connected to each other; system can also directly by the five anti simulation screen instead of the five prevention host operation ticket previewing, lower ticket function. Five prevention host or five anti simulation screen through the remote signal receiver data acquisition system RTU or monitoring host computer, and the key back dummy remote signaling, make a system diagram five prevention host, five anti simulation is consistent with the actual running state of the current
Working principle of 1.3 SWF2000 system
SWF2000 type microcomputer five protection system is the result of computer and network communication technology used in substation automation. System logic database by software, the two electrical locking loop large field into Anti misoperation locking rules in a computer, anti misoperation host using the anti misoperation locking rules base logic judgment to preview operation simulation, simulation preview records in accordance with the procedure of anti misoperation locking rules, to generate the actual operating procedures. The operator will computer key is inserted into the key transmission port for connecting tickets, then after operation, operated by personnel holding the key to the site to operate computer. When operating, computer keys according to preview the correct order to display the current operation, operation personnel in accordance with the computer key prompting equipment will key into the corresponding computer coding lock, if correct, then open the locking mechanism, the operator can spot operation circuit breaker, electric isolating switch operation or lock switching to open machine code. Operation of the items, computer key will automatically display operation a. If not properly, will not be unlocked, and a voice alarm, to remind the operator. The operation is completed, the computer will return the key information state of the equipment operation task to host. According to the host operator feedback, the corresponding equipment for a refresh, so that the state and the scene equipment remains the same, reach and field equipment automatic positioning function.
SWF2000 five protection system to realize the digitization of anti misoperation locking, and can realize the past can not be achieved or anti error function is very difficult to achieve, is maloperation prevention technology of electrical equipment of the latest technology and leap.
Characteristics of 1.4 SWF2000 five prevention system
The system is summed up in the original five prevention system based on the set, then director of the public house, to the development of a high technical level five protection system. The system will monitor and control system and data acquisition system organically, realize the sharing of information resources, advanced technology and reasonable, flexible and convenient installation, safe and reliable use. The function of the software user-friendly, practical.
Its main features are as follows:
● the substation integrated automation system and five protection device com., make full use of the hardware and software resources, reduces the cost, improves the performance of the system.
● available five anti simulation screen instead of the five prevention host, to achieve the "two screens", through the simulation screen and return to the screen to achieve online real-time contraposition, electric quantity display, flash alarm, bus luminous function state of the equipment, at the same time simulation rehearsal on the screen, the operation ticket checking correctness. The operation rehearsal, more accurate, intuitive votes.
● perfect locking function: to achieve strong business closing the circuit breaker, isolating switch, grounding switch, temporary grounding wire, mesh doors and other equipment, not only to meet the basic "five anti" lockout function, also can realize the bypass bus charging, generation of road, bus operation, the line side electricity testing complex