Electromagnetic location methods
Electromagnetic location methods
Electromagnetic location methods – the method is based on electromagnetic induction. Locators do determine the position of pipes and cables.
Electromagnetic location methods has the following distinctive characteristics:
1. search from the ground and definition the presence of underground communications;
2. trace and identify specific lines;
3. measurement of the depth of communication directly from the ground;
4. portability of equipment;
5. low equipment weight and capability effective use even inexperienced by the operator (for most operations);
6. possibility of using equipment on all types of soil and even under water;
7. low cost of equipment and its individual components for the implementation of this method.
Electromagnetic location methods – detect the magnetic field around the communication created by alternating current flowing through it. Presence of magnetic fields around communication with current and allows you to define her position. Communication isolation or presence different types of soil does not change the type of field. Variable the current generates a detectable electromagnetic field or “signal”. Which is installed on the generator and provides the possibility of efficient location using electromagnetic induction. Let’s start with the fact that, in general, most of the locators known today.
Electromagnetic location methods are like domestic and foreign production, operates on one principle – the electromagnetic induction. They all respond to changes in the electrical current flowing through the communication. If we work with a live cable – we work in a passive mode (without a generator). The cable de-energized – create it with a generator. Thus, it can be concluded that any the tracker can work and seek equal results.
However, Electromagnetic location methods in practice everything goes much harder. And the slightest features of the device allow significantly win in the end result. The most effective devices that allow to work both in active mode and in passive mode, which predetermines. The receiver has 2-3 active frequencies and industrial frequencies of 50 and 100 Hz. Currently these capabilities are in the FM series (Germany), RD (UK), PL (Japan) of foreign production.
Electromagnetic location methods series “Success ATG”, “Success AG”, “Athlete” company “TECHNO-AC” (Kolomna). The main disadvantage of the electromagnetic location method is that with its help can not be held tracing plastic pipes. Solve this complex problem, apply only acoustic location method based on listening from the ground. With an acoustic sensor the signal generated by the sound pulse generator pipeline.
Electromagnetic location methods thus, to solve the whole complex of tasks on localization of underground communications in the kit should include a generator of sound pulses. Currently, the only domestic device such type developed and produced LLC “TECHNO-AC” (Kolomna). Foreign analogue of the RSP-3. The presence of an acoustic sensor for a series of devices “The success of the ATG”. “The success of the TPT” in addition to tracing pipelines from any materials.
Electromagnetic location methods, allows you to solve the problem of finding places depressurization of pipelines and places of damage cable-induction and acoustic lines. In addition, the presence in the set of sensors step voltage (DKI, DODK). Allows you to search for a place of decrease insulation resistances of the external covers of communications. And Also search for the place of cable damage by the capacitive method. To solve the problems facing the services, operating underground communications:
- localization and tracing underground communications;
- control of isolation of external covers of communications;
- finding for unauthorized inserts into pipelines;
- for places of depressurization of pipelines;
- search for damage to power cable lines;
- monitoring the state of Cable.