Main: ARC protection equipment|
The Institute develops and manufactures the arc protection equipment based on the fiber-distributed detector. Whenever the electric arc appears in the cabinets of the integrated distribution devices 0.4-35 kV the electric signal to switch off the cabinet is generated into the automatics and relay protection circuits. Max length of the detector covering one or a number of cabinets is 25 m, the number of sections monitored at one and the same time is 24.
Arc protection equipment ÔÂÈÏ.423133.004 (APE) with fiber-distributed sensor is intended for arc origin registration whenever it appears in cabinets of the integrated distribution devices (CIDD) and build-up one-side operating cabinets (BOC) (0.4…35 kV) and for generation of electric signal into the automatics and relay protection circuits to switch off the cabinet section.
APE consists of power supply and signaling unit and either one or two sensors with 25 m lengths. Single-channel equipment provides control of 10 up to 12 cabinets (CIDD), and two-channel equipment - of 20 up to 24 cabinets in one section. APE is a universal device that can be mounted without any additional updates inside CIDD cells or BOC of any type. APE response time is no more than 26 ms.
APE distinctive feature lies in use of in-space-distributed illumination sensor, i.e. sensor that can register light with its full length and with any part of lateral surface. APE actuates from arc at the moment this origins inside CIDD or BOC, when this current is from 0.5 kA and the illuminated area of sensor is no less than 0.3 m. The sensor is made from dielectric materials that provide galvanic isolation of high-voltage circuits from low-voltage circuits, increase operating safety, and exclude a possibility of commutation electromagnetic noises or other types of noises from high-voltage circuits to relay protection circuits transfer.
The electronic unit is intended for conversion of visible signal from fiber-optic led to electric signal and discrete signals ("dry contact" type) generation (contacts closure/breaking of ÐÏ21 electromagnetic relay). These discrete signals are sending into the relay protection for switching off power supply circuits of section where arc appeared. It is foreseen the "dry contact" type of power supply output for remote control of electronic unit power supply. There are indicators on the front panel of electronic unit that provide user with information about arc origin and the device power-up.
In order to provide the interlock of device response for current, the output relay contacts allow tandem connection of contacts (means front or back contacts) of maximum current relay ÐÒ40 type). It is allowed a commutation of ÐÏ23 type of interposing relay coil for increase of commutating current or number of output contacts.
The photoflash with leading value that is no less than 24 and pulse duration from 0.5 to 1 ms can be used for verification of device workability.
APE is notable for high operability and service safety, mounting simplicity and almost maintenance needless. During the operating life period there were no cases of electrical arc origin. In all those mentioned cases the device operated in a regular way, i.e. generated signals for removing a high-voltage from emergency state circuits that allowed putting out electrical arc in a proper time without visibly noticed defects of protecting equipment.
The device overcame all testing procedures at SRC VVA and ORGRES firm and was accepted by interdepartmental committee that entered OAO RAO "UES of Russia" and "ROSENERGOATOM" representatives.
ÔÂÈÏ-Ñ microprocessor-based arc protection equipment (APE) is designed for detection of an arcing fault inside cabinets of 0.4 to 35.0 kV integrated distribution devices (KRU) and for generation of control signals to the automatics and relay protection circuits. ÔÂÈÏ.423133.004 device developed and manufactured by VNIIA is a prototype for ÔÂÈÏ-Ñ device.
ÔÂÈÏ-Ñ equipment Ensures:
The device remains healthy 1 s after power failure. In case of long power-off the device saves in its nonvolatile memory information on operating mode, state of ÄÓÃÀ, ÎÒÊÀÇ, and ÌÒÇ indicators, and ensures their recovery after resumption of supply. ÔÂÈÏ-Ñ requires minimum expenditures in case of rapid and ordinary mounting of the device without essential alterations of the KRU cabinet design.
ÔÂÈÏ-Ñ main technical characteristics