Arc suppression cabinet (JNXG)

JNXG harmonic elimination of line selection and over-voltage protection devicesuitable for 3 ~ 35 medium voltage power system, the product is widely used in the 3 ~ 35KV neutral non grounding, neutral grounding by arc suppression coilor neutral point of power system grounding with high resistance, can restrict all kinds of the system over voltage, effectively improves the system's operational safety and reliability of power supply. With arc suppression function, and bothPT, over-voltage protection function; optional harmonic elimination, small current line selection function; suitable for cable line based grid, cables and overhead lines hybrid grid and overhead line based grid.

The working principle and basic function:

When the system is in normal operation, open delta voltage U △ is small,system display "operation", when U △ from low level to high level, that the system failure, the micro controller HDHK to immediately start interrupt,according to PT two input signal Ua, U B, U C type of fault and fault typejudgment.

When the single-phase grounding fault occurs, the arc suppression circuit breaker operation, fault phase grounding, in 15ms so will the arc light, and the arc grounding overvoltage limit online voltage level, which can effectively avoid short leading to arc grounding and lightning arrester due to arc grounding overvoltage cause of the explosion.

When the PT disconnection fault alarm, controller and switch quantity outputcontact signal, so that users of the likely due to PT break cause of interlockprotection misoperation.

Alarm, arc suppression controller panel displays the fault type PT wire,grounding fault and not, at the same time output passive switch quantity signal contact.

Device configuration of RS485 interface, can transmit data according to thecommunication protocol provided by the user.

Voltage transformer in the device can provide a signal to the meter and relay protection, can replace the conventional PT cabinet.

The device has the function of fault types can be recorded 20 fault time andfault.

Optional features:

The device can also be equipped with automatic line selection function.

The device can be configured according to user requirements (in addition to)harmonic elimination (vibration) function.

The switch state display and control device with a simulation diagram, live shows, switching status indication, grounding indicator, energy storageinstructions, hand trolley position indication, speech error prevention tips,temperature and humidity control, RS485 remote communication and other functions.

The company specifically for the elimination of switch time harmonic eliminationarc device is developed, its principle is to install a sensitive devices in PT aneutral point, in the non resonant case, the resistance is small, the PT neutral point grounding, once the resonance, the device has the high resistance statein tens of milliseconds, equivalent to the neutral point of PT is disconnected,the PT out of saturation, resonance elimination. Resonance is eliminated, the device back to the low resistance state in about 1 second, does not affect themeasurement of PT.

Product advantages:

The device adopts phase control circuit breaker imports, adapt to thecapacitive current range, up to 1250A, and not subject to breaking short circuit current small restricted, with good thermal stability.

The circuit breaker to replace the arc phase control scheme to eliminate thetraditional fuse and the contactor, reduces the workload of daily maintenanceand replacement of fuse cost and time.

Device operation speed, can be in about 15ms of fast action, greatly shorten the single-phase grounding arc duration.

Device can immediately extinguish the arc, and can effectively limit the arc grounding over voltage.

Device action, capacitive current allows 1250A continuous by at least 2 hours or more, the user can then handle the fault line after the switch operationcompleted the transfer of load.

The protection function of the device is not affected by the grid size andoperation mode.