Diode-resistor Unit (DRU)

Application

For simultaneous protection of up to 4 unrelated underground metal structures against corrosion and for elimination of adverse effect of segregated protection units on adjacent utility networks. They operate in combination with a rectifier and ensure cathodic protection of structures by setting of protective current for each of the protected objects depending on the state of their isolation.

The units can also be used for polarized drainage.
Required user qualification – technical vocational education.
Ingress protection rating IP34.

The units ensure reliable and sustainable operation under exposure to the external climatic and atmospheric conditions:

  • — ambient temperature from -60 to +40 С°;
  • — relative air humidity 100% (upper value) at +25 °С;
  • — atmospheric pressure 86.6-106.7 kPa (650 – 800 mm Hg).

 

Specification

Sr. NoDescription of parameter10 A25 A50 A
1 Number of independent channels 1-4
2 Rated current of each channel, A, minimum 6 15 30
3 Peak current of each channel, A, minimum 10 25 50
4 Control resistance, Ohm 0.095 0.08 0.05
5 Resistance control range for each channel, Ohm 0 to 0.3±0.04 0 to 0.24±0.04 0 to 0.12±0.04
6 Number of control steps for each channel 2 3 1000 (10)
7 Permissible (maximum) reverse voltage, minimum, V 1000 (10) 1000 (10) 3
8 DC rated voltage, maximum, V 150 150 150

Appearance

Fig. 1 – DRU appearance and overall dimensions

Fig. 2 – General view of PSS TS with DRU (in a triangular sectioned stand):

1 – stand cover;
2 – labeling stickers (or area for marking);
3 – DRU channel cover;
4 – terminal block cover;
5 – PSS TS rest;
6 – air inlets;
7 – device preventing free removal of the stand from soil (two 500 mm long plastic tubes, d=33 mm)

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