For fencing of grazing cattle can be temporarily applied electric fence consisting of a single-wire line and the device for voltage conversion.
Single-wire line is made on metal racks. The racks one end is sharpened, and the second threaded for screwing porcelain insulators. On, the insulators fix a wire strung between the posts. Line length can reach up to 2000 m and more.
Device voltage conversion is assembled according to the scheme shown in the figure. Load widespread voltage Converter, the main parts of which are the transistors T1 and T2, the transformer TR1, the battery B1 is the ignition coil KZ1. One end of the secondary winding of the coil is grounded, and the second, high voltage is connected to wire line.
Metal rack manufactured length of 120 cm To the counter at a distance of 20 cm from the pointed end welded to the bracket that is used for indentation rack foot in the ground. In the manufacture of a single-wire line can be applied steel wire, used for knitting bales of straw or hay.
All the details of the voltage Converter is placed on a plate having dimensions 130x130 mm, made of insulating material (plated hardened paper, plywood, etc.). The plate is placed in a box where the battery and ignition coil.
The voltage Converter can be applied to the transistors P and P. For better cooling place them on aluminum radiators having dimensions HH mm.
Transformer TR1 Converter harvested using core Sh or Sh. Winding 1 contains 14 turns with tap from the middle of the wire enamel insulation is 0.7. Her first wound on the frame directly into the two wires. Winding II has 60 turns with a branch of the middle. It is made by a wire of PEL of 1.0. The last wound coil III, containing 120 -130 turns of wire PEL of 1.0. Between the windings must be two or three layers of insulating paper.
Ignition coil could be from a car or motorcycle for 12 or 6 V.
Described electric fence works flawlessly for three seasons on cultural pasture farm "Path to communism" of the Volgograd region.
Editor's note. We were asked to comment on an article about the electric fence comrade. I. R. Viksna, Deputy head of the leading specialised design Bureau on a range of machines for cattle farms. Here's what he told us.
Electric fence proposed tov. A. dancing East dances, has its advantages and disadvantages. The advantages of it is the application of porcelain insulators, which have high insulating properties even in wet weather (insulators have the so-called "dry zone"). The battery serving as a power source device, safe and easy to handle. Since the output impedance of the Converter is determined by the resistance of the secondary winding of the ignition coil, large, then when you touch the animal, the output voltage will be reduced from a few thousand to 10-30 V.
The disadvantages of the fence should include the use of steel wire without coating, which increases its corrosion. It is better to use galvanized steel wire. The battery that feeds the hedge, require frequent charging, which increases the cost of the device. Converter of an electric fence is ineffective and has low efficiency. If you increase the power delivered from the Converter, and to reduce its output impedance, the effectiveness of an electric fence will increase, but such a fence can become hazardous to animals and humans. In this case, it is necessary to use instead of the transmitter oscillator operating in a pulsed mode.
Therefore, the described electric fence safe to handle and can be used for fencing small areas or for grazing of horses that are 10 times more sensitive to electric current than cattle. Electric fence may be temporarily used, if it is not possible to buy mass-produced electric fence IE-200 through a local Association "Agriculture".
Author: A. dancing East dances, Elan Volgograd region; the Publication: N. Bolshakov, rf.atnn.ru