Main functions

On the basis of the traditional DTU function, the metering-level distribution line loss collection function is added, the judgment and positioning function of small current grounding faults is optimized, and the sampling frequency is increased, so that the waveform of the fault recording is closer to the real waveform.

◇Line loss collection function

The distribution line loss collection module is used to realize the interval electric energy collection function, and the electric energy data on the line is measured in real time, including: forward and reverse active energy calculation and four-phase limited reactive energy calculation, so as to realize the bidirectional metering function and support the positioning function;

◇Small current grounding fault judgment and positioning function

Through the analysis and collection of phase current transformer and zero-sequence current transformer data, the control unit judges these characteristic quantities through multiple algorithms, so as to accurately locate the area where the fault occurs;◇Fault recording function

Through sampling of 128 points per cycle and complete recording of each channel waveform of the 4 cycles before the fault and the 8 cycles after the fault, as well as the open position and other telesignal information, it is sent to the auxiliary station for analysis of the cause of the fault, and supports the cyclic storage of 64 fault recordings.

Main features

◇Adopt voltage-time electromagnetic mechanism or conventional spring operating mechanism;

◇With conventional protection, voltage-current type, and distributed intelligent FA functions;◇Adopt "centralized and decentralized" control terminal, intuitive and easy to use;

◇Adopt CVT electronic voltage sensing technology;

◇Isolation knife and vacuum interrupter linkage;

◇Supercapacitor backup power supply, maintenance-free throughout the life cycle;◇Circuit breaker/load switch can be assembled in any cabinet, flexible and convenient.

Functional characteristics

◇Adapt to the requirements of feeder automation, the controller uses line voltage as the criterion, and realizes local fault processing through delayed closing and substation protection. It does not require batteries, does not rely on communications and master stations, and can realize complete feeder automation functions on site;

◇The design abandons the system instability caused by maintenance devices such as batteries;◇Clear distribution of distribution network automation system functions, easy to operate;

◇Adopt frequently operated load switches/circuit breakers to meet the requirements of economic operation of distribution network automation;◇Adopt vacuum arc extinguishing, SF6 gas external insulation, and oil-free design;

◇Three-phase common box layout, porcelain cable casting outlet, fully sealed mechanism, Military-grade aviation plugs and overall full sealing technology ensure that the product has strong weather resistance, good anti-condensation performance, and is maintenance-free for fifteen years;◇The built-in isolation break is asynchronously linked in series with the vacuum interrupter, with strong switching ability and high safety;

◇Reliable sealing performance: It has mature sealing shell technology and IP67 protection level. The shell is processed by a one-time molding process of mold stretching, which is easy to seal the box, has high airtightness and high mechanical strength;

◇It has maintenance-free characteristics. The main circuit of the load switch/circuit breaker, secondary components, and operating mechanism are all sealed in SF6 gas (zero gauge pressure), which is not affected by the external environment, and has stable performance, reliable, and maintenance-free.