PRS-711 Microcomputer-based Line Whole-set Protection Device
PRS-711 device is microcomputer controlled fast protection device for digital high voltage lines, which is applicable for lines with the voltage grade equals to and below 110kV, neutral point direct earthing, and three-phase tripping when fault occurs to keep the stability of the system.
The basic configuration of device protection includes whole distance and zero sequence protection, and the configuration of distance pilot protection and zero sequence pilot protection is available for whole line quick-acting required occasions. Together with dedicated transreceiver, the device can achieve pilot protection though high frequency carrier; it can also build the optical transmitter and receiver inside, and achieve pilot protection through fiber channel. All types of devices have three phase one shot reclosure function, and with tripping and closing control circuit and AC voltage switching circuit.
PRS-711 device adopts advanced hardware platform and perfect software design, the software function configuration of the device is flexible and complete, the interface mode setting of the pilot protection channel can fully meet the customer’s requirements, the communication is very reliable, and supported with powerful auxiliary functions, all of which provide the whole protection device with more excellent performance.
PRS-711 Microcomputer-based Line Whole-set Protection Device
PRS-711 device provides a variety of protection elements, which can be configured according to customer’s requirements. The primary protection elements include:
Distance pilot protection/Zero sequence pilot protection
Variation distance relay
Four-zone phase-to-phase distance/Three-zone earth distance
Four-zone zero sequence directional over-current/Zero sequence inverse time over-current
Unsymmetrical fault sequent quick-acting/Double lines sequent quick-acting protection
Switch onto fault protection
Weak feeder protection
Voltage break detection and emergency state protection
Three phase one shot automatic reclosure/Synchronism check manual close
Slip or no slip lock low frequency load shedding/under voltage load shedding
Over load protection
TA abnormal/angular difference abnormal/TWJ abnormal warning function
The device has whole line quick-acting pilot protection consists of overrange range direction and zero sequence direction elements, which is quick-acting, and the quick break time of the whole line is less than 25ms.
Two CPU plates of the device have independent starting elements, only both starting components are active, the whole protection device opens, so the protection is of high security.
Not affected by oscillation, no false operation at system oscillation (no fault), and can still keep the rapidity and selectivity of the protection action when fault occurs again in oscillation.
Not affected by the installation of weak feed backside, with right protection function for the week power backside.
The switch onto fault protection removes all faults of the whole line rapidly when switching on manually and automatically.
Can input reliable emergency state protection at TV breaking time to ensure the performance of the device.
The device is designed with high performance platform, with high reliability and powerful anti-interference capability. Sampling with 32 bits floating point DSP and 16 bits high precision A/D, and has powerful calculation and logic function.
Unitized design, modular structure, with high expandability.
Large-screen Chinese character color liquid crystal display, intuitive and friendly interface menu, complete process record, intuitive detailed information, and convenient operation and debugging.
With high reliability industrial level devices as the main body, adopts automatic monitoring and compensation technology to improve the stability and reliability of the hardware circuit.
Close and reinforced unit chasis, multilayer screen, etc. anti-vibration and anti strong interference design.
Give full play to the superiority of microcomputer protection, with a variety of auxiliary functions, and reflects the humanized design.
Perfect fault analysis function, including the protection of action event records, fault starting records, fault recording records, device operation records, opening-inserting phase change records, device self inspection records, and lock records, etc., can reappear the status of the fault and the action of the protection device at the fault time. (the device can store the latest 128 action event records and 32 recording records.)
Flexible background communication mode: three TCP/IP Ethernet interfaces, two RS485 interfaces, one CANBUS interfaces, one serial print interface, one GPS pulse access interface (differential input or idle contact input, self-adapting to the three timing modes, namely PPS, PPM, and IRIG-B serial code). Supports IEC60870-5-103 standard of the power industry. The communication speed can be set.
Introduction of Pilot Protection Channel
The pilot protection of the device can connect with all kinds of channel communication devices (dedicated transreceivers and multiplex carriers for relay protection). Sending and stopping control with one contact point, and not send is stop. When applied to the dedicated lock mode, channel logic is achieved by the protection device, and the stopping and sending of the transreceiver is completely controlled by the protection.
The pilot protection sending and receiving of the device can also be achieved though fiber channel, which is available for permissive protection. There are two solutions for the connection between the protection device and the fiber channel, one of which is the connection point mode, meanwhile, equips with optical interface devices, connects the receiving and sending connection of the protection device with the optical interface device to realize the receiving and sending function; the other is adding built-in optical interface plates to connect directly with the fiber channel.
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