Опис
The meter of the distance to the place of damage of the cable ЦР0200 (hereinafter the meter) is designed to determine the distance to the place of damage of the “floating breakdown” type and to the place with reduced electrical resistance of the insulation of power electric high-voltage cables with paper-oil insulation of the SB, ASB, AAB, OSB type with a nominal voltage 6 – 22 kV at a distance of up to 40 km to the place of damage.
The meter works together with a high-voltage rectifier unit (purchased separately) type AID-70 or similar.
Measurement methods:
– determination of the distance to the place of the “swimming breakdown” in the cable is carried out by the oscillating discharge method, which is based on the measurement of the time of the half-period of the oscillating electromagnetic process that occurred when the insulation of the charged cable breaks down;
– determination of the distance to the damage site with transient resistance at the damage site from 0 to 100 kΩ is carried out by sending a high-voltage pulse from the charged capacitor through the arrester to the damaged cable core and measuring the time interval between the two reflected pulses. For the vast majority of high-voltage cables with paper-oil insulation with an operating voltage of 6-22 kV, the propagation speed of the electromagnetic wave is 160 m/μs and practically does not depend on the type and cross-section of the cable.
Technical characteristics
The range of measuring the distance to the place of cable damage is from 40 to 40,000 m.
The limit of the value of the main permissible error is equal to ± 20 m.
The sub-ranges for adjusting the delay duration are shown in the table:
|
Subranges of delay regulation, m |
Indicators of the meter in the extreme positions of the handle DELAY SMOOTH, m |
|
|
minimal, no more |
maximum, no less |
|
|
0 60 – 250 250 – 1,500 1,500 – 7,500 7,500 – 40,000 |
0 60 230 1 420 7 120 |
0 270 1,580 7,880 42,000 |
The range of input signals is from 2 to 250 V.
The meter is powered by an alternating current network with a frequency of 50 or 60 Hz with a deviation of ± 0.5 Hz, a voltage of 220 V with a permissible deviation of ± 10%. The content of harmonics is 5%.
The power consumed by the meter from the power supply circuit is no more than 20 V × A.
The duration of continuous work is 8 hours.
The break time before turning on again is 15 minutes.
The time to set up the working mode is no more than 5 minutes.
The average service life of the meter should be at least 8 years.
The average working time before failure is at least 8,000 hours.
Overall dimensions, mm:
– measuring 335x305x140;
– connecting device voltage 140x110x700;
– current connecting device 79.5x192x192.
Mass, not more, kg:
– meter (without connecting devices) – 5.5;
– connecting device voltage – 2.5;
– current connecting device – 1.2.