All-Russia Research Institute of Automatics, STATE ATOMIC ENERGY CORPORATION ROSATOM
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.
The arc protection equipment is fast-response, safe in the operation, easy to install, and requires almost no maintenance.
The arc protection devices are successfully operated at several dozens of power generating facilities and nuclear power plants.

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  Arc protection equipment .423133.004
Arc protection equipment .423133.004
Arc protection equipment .423133.004            

Arc protection equipment .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) (0.435 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 21 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 40 type). It is allowed a commutation of 23 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.

.423133.004 Specification
Specification Units Values
Minimal arc current, calling the response k 0.5
Response time ms, no more than 20
Output signal duration ms, no less than 400
Workability time after power supply switching off ms, no less than 2
Maximal length of arc registration channel For one channel variant (one illumination sensor) M 25
For two channel variant (two illumination sensors) M 225
Supply voltage Alternating current (AC) (50 Hz) V 220
Direct current (DC) V 220
Ambient air temperature For devices with alternating current power supply (- 40+ 40)
For devices with direct current power supply (- 25+ 40)
Output signal   "dry contact"
Dimensions (of signaling unit) mm 290x180x95
Lifetime years 12

APE .423133.004 connection diagrams; APE .423133.004 delivery geography map; License and certificates
  - Arc Protection Equipment
- Arc Protection Equipment
- Arc Protection Equipment         

Commercial video "Arc protection equipment -"

- 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. .423133.004 device developed and manufactured by VNIIA is a prototype for - device.
Commercial operation of over 1250 .423133.004 devices during 12 years confirmed high reliability of the developed and produced by VNIIA arc protection equipment and arc flash fiber-optic sensors (FOS) used in it.
- is installed in each cabinet of the KRU section. The device includes compact power supply and signaling electronic unit (145x123x60 mm) and three FOS, which allows controlling all the 3 bays of a single KRU cabinet, namely busbars bay, drawout unit bay and cabling bay.

- equipment Ensures:

  • Selective disconnection of branch line switches;
  • Generation of control signals:
    • 1st level - by branch line switches;
    • 2nd level - by upstream (input and section) switches;
  • Generation of signal (2nd-level signal with adjustable in broad range delay);
  • Generation of and signals;
  • Capability of joint operating 1 and 2 signals from the switches of the two levels, which ensures protection against false response;
  • Capability to set the device operation modes and adjustable parameters in a wide range meeting the customer requirements;
  • Continuous automatic monitoring of FOS state of health including faulty SOF indication;
  • Indication of KRU cabinet emergency bay;
  • Indication whether there is the device supply voltage or not;
  • Indication of the mode of joint operating 1 and 2 signals;
  • Generation for external control circuits of information signals , (FOS failure), and .

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 , , and indicators, and ensures their recovery after resumption of supply. - requires minimum expenditures in case of rapid and ordinary mounting of the device without essential alterations of the KRU cabinet design.

- main technical characteristics
Electric arc current threshold value of device actuation, kA 0.5
Number of independent arc detection FOS 3
FOS maximum length, m 6
OUTPUT SIGNALS: branch switch turn-off 2 signals
up-stream switch () turn-off 2 signals
2 signals
2 signals
Actuation time, no more than, ms 10
Duration of signals for switches turn-off, at least, ms 300
Duration of signals and till the button is pressed or the power is turned off
Delay time of signal, ms 0 to 500
Type of output signals 'dry contact'
Setting range for 1 and 2 signals waiting time, with 5 ms step, ms 0 to 50
Input signals 1 and 2 - direct or alternating voltage, V 100 to 250
Supply voltage: alternating current 100 to 242 V, 50 Hz
direct current 100 to 300 V
Power consumption, no more than, W 5
Overall dimensions, no more than, mm 145x123x60
Operating temperature range, C - 40 to +40

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