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HIGH-VOLTAGE OSCILLOGRAPHIC REFLECTOMETER "ISKRA-4"

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Specifications
Equipment

Maximum measured distance to the place of damage, km ………… 15.3 (35 *).
by individual order, without changing the cost of the device

The minimum measured distance to the place of damage, m ………… ... ………… ..3;

Discreteness of measurement, m …………………………………………………… ... …… .0.5.

Parameters of high-voltage probing pulses at a load of 30 Ohm:

  • amplitude, kV ……………………………………. ……………… .. ……………… from 3 to 25;
  • front duration, microseconds, not more ……………………………………… ... ……… ..0.15;
  • pulse duration, μs, not less ……………………………………… ... …….… ..2.

Parameters of low-voltage probing pulses at a load of 30 Ohm:

  • amplitude, V, not less ……………………………………… ... ………………………… ..5;
  • front duration, μs, not more …………………………. …………… ... ……. …… .0.02;
  • pulse duration, μs ………………………………………… ...…. ……… ..… 0.05-10.

The highest operating voltage of the impulse voltage sensor, kV …………… .60.

The error in measuring the distance to the fault site at high voltage depends on the measurement mode and on the breakdown voltage of the damaged area.

In the case of measuring the distance at high voltage in the "floating breakdown", no-load, short-circuit modes, the error is from +15 to +25 meters at a distance of up to 1 km, and from +20 to +40 meters at a distance of over 1 km. The measurement accuracy depends very much on the accuracy of the shortening factor KU set in the device (the speed of propagation of the voltage wave in the cable. For power cables this parameter is not standardized. In addition, it is not uncommon for a part of the cable line to be laid by another type of cable with a different shortening factor) ...

The OTDR allows continuous operation for ~ 8 hours.

The service life of the reflectometer ………………………………………… .. not less than 5 years.

Name and type of component

Overall dimensions, mm

Weight, kg

Quantity, pcs.

1. High-voltage reflectometer

"ISKRA-4"

280x240x125

3

1

2. Impulse voltage sensor DIN-1

290x180x50

0.7

1 or 2

at the request of the customer *

3. Pulse current sensor DIT-1

110x65x45

0.2

1

4. Low-voltage connecting cable

Length 1.5 m

 

1

5. Coaxial connecting cable

Length 0.4 m

 

1

6. High-voltage oscillographic reflectometer "ISKRA-4". Manual. I-4 / 00.00.00.00RE

 

 

1

7. Set of cables and connectors

 

 

1

8. Adder

60x80x20

0.1

1

High-voltage oscillographic reflectometer "ISKRA-4" (hereinafter referred to as "reflectometer" or "instrument") is designed to determine the distance to the place of damage to power supply cables .

The device allows:

  • to detect and determine the distance to the place of damage or inhomogeneity by the location (reflectometric) method on symmetrical and asymmetrical cables;
  • measure the length of cables (including on drums and in coils) or the distance to break or short circuit;
  • memorize, store and process measurement results;
  • as part of a mobile electrical laboratory, determine the distance to damage in cables up to 15.3 km (35 km) in length for all types of damage without using the preliminary complete burning of the insulation.

An OTDR allows you to determine the distance to the cable breakdown using low and high voltage using the following methods:

  • TDR (low voltage pulse method);
  • ICE (high voltage current coupled oscillatory discharge method);
  • Decay (voltage coupled high voltage oscillatory discharge method);
  • ARC (high voltage pulsed arc method).