Zw32-12f Intelligent Vacuum Circuit Breaker (with Watchdog)

Summary
ZW32-12F high-voltage intelligent dividing vacuum circuit breaker (commonly known as watchdog) is used to switch off and close the load current, overload current and short-circuit current of rural power network, urban power network and small power system. The overall layout of the product is three-phase pole type. The three-phase vacuum interrupter is placed in the sealed pole. The insulation material is used to insulate between phases and the ground. The performance is reliable and the insulation strength is high. Recloser type intelligent circuit breaker. The basic and coincidence controller matches are applicable to the occasion of easy power supply, the PT and coincidence controller matches are applicable to the occasion of no power supply, the intelligent circuit breaker is applied to the radial power supply and loop network power supply system, the subsidy system eliminates the instantaneous impediment, actively regulates the power supply, also can cut off the eternal impediment, and realize the initiative of distribution network. Intelligent circuit breakers are equipped with 1-3 times of reclosure results, and the parameters of reclosure can be adjusted; Intelligent circuit breakers are equipped with the results of inrush current control, overcurrent shield and short-circuit quick-break combined shield, and the parameters can be continuously adjusted; Intelligent circuit breakers are equipped with small current grounding shield results, and the parameters can be continuously adjusted; The circuit can be controlled by wired remote control or by wireless remote control under the pole.  Three-phase power system for switching 50Hz, voltage 10-12kV, used for interrupting and closing load current. It has overload and short-circuit shielding results, quick-break shielding results, time-delay shielding results, active reclosing results. It can also be equipped with lightning arrester or interrupting switch (i.e. combination of circuit breaker and interrupting switch) according to user's need. The intelligent circuit breaker has its own power supply, which can be operated by remote control in the vicinity, with CT and PT interfaces, and can satisfy the requirements of telemetry. The circuit breaker has arc extinguishing device, so the circuit breaker can be operated with load, not only to control the load current, but also to control the obstruction (short circuit) current; the circuit breaker has excellent packaging conditions.  Potential, therefore, simply observing the circuit breaker, can not directly determine whether it is in the closed or open position.

There is no arc extinguishing device for the disconnection switch, although the regulation stipulates that it can be operated in the case of load current less than 5A, but it can not be operated with load in general; but the layout of the disconnection switch is simple, and its operation status can be seen at a glance from the surface, and there is a significant breaking point during inspection.

Circuit breaker is abbreviated as "switch" in use, and cut-off switch is abbreviated as "knife gate" in use. They are often used together. Line shield setting is relatively simple

As usual, the shield of 10 kV tilt-rolling line in substation only includes overcurrent, quick break and reclosure shield, and two zero sequence shield in small resistance grounding system.  Therefore, in order to guarantee the selectivity and sensitivity of relay shield, it is necessary to make the whole line within the scope of shield, requiring that the shield should be sufficiently sensitive when the end of the line is obstructed. In this way, due to one obstruction of Yucheng power cut, and the line shield between the upper and lower levels of the common path, there is no shield differential time at the end of the line, can only lose the selectivity to prevent the trip and cause the whole line trip.
Differential 10 kV Grounding Method
In dealing with arc suppression coil grounding system, 10 kV distribution line will not switch off when single-phase grounding obstruction occurs, and only send grounding signal. To deal with the small resistance grounding system, 10 kV distribution lines are protected by zero sequence, and the single-phase grounding system will trip when the single-phase grounding is obstructed.

The 10 kV feeder tilt rolling line has high impediment rate and poor reliability, while the 10 kV feeder has high impediment rate and poor reliability.

With the increasing demand of users for the reliability of silent power supply, the installation of user demarcation switch with computer shield, measurement and control, and integration of communication module, has become one of the effective ways to deal with the above topics in distribution network.
Performance and Important Role of Boundary Circuit Breaker
Our company's dividing circuit breaker has its important achievements: active disconnection of user side short circuit hindrance, active removal of user side grounding hindrance, and can be used to manipulate disconnection hindrance current.

The dividing circuit breaker has a set of external voltage transformer and a set of built-in current transformer, a CPU internal processing penalty and communication module, a voltage judgment and impediment image when impeding tripping, and a result of tripping and blocking.

The demarcation circuit breaker is applied to the demarcation between 10 kV tilt-rolled distribution lines and users (including temporary users) which are not grounded at 10 kV neutral point, grounded by arc suppression coil or grounded by low resistance system. Active removal of single-phase grounding hinders the active switching of the demarcation switch when a single-phase grounding hindrance occurs on the user's branch line, discarding the hindrance branch line, and ensuring the quiet operation of the substation and other branch users on the feeder line.
Active disconnection of phase-to-phase short circuit hinders that when the user branch produces phase-to-phase short circuit hindrance, the demarcation circuit breaker immediately switches off and discards the hindered line. It prevents the line from being cut off and makes other branch users on the feeder supply power with agile rules.
Fast Location of Obstacles

After the user branch line obstruction factor boundary switch initiative, only the responsible user blackout, and can actively report the obstruction information, so that the power company can quickly understand the point of change, timely conduct on-site treatment and punishment, so that the obstruction line as soon as possible to regulate power supply.





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