SU140289A1 - Device for electrofishing fish - Google Patents

Description

The invention relates to electrical device circuits that provide bipolar pulses of variable parameters for electrocution of marine fish. Devices for electrofishing fish are known by creating an AC electric field that prevents the fish from moving, made in the form of a DC generator connected through a switch to one of two electrodes immersed in a pond with fish, and through a choke and controlled ion valve to another an electrode with a capacitor battery and a chain parallel to it from another controlled ion valve and throttle. However, these devices can be used in the application of high-power current, which is not always possible to provide, as well as complex in design.

In the described device, one pole of a capacitor battery is connected to one of the electrodes, and the other through one of the valves to the positive pole of the generator and through the other valve to the negative pole of the generator and to the other electrode. For overload protection, the generator is enclosed by a capacitor.

FIG. 1 shows a diagram of a generator of bipolar pulses; in fig. 2 is a graphic representation of the current in the electrode circuit as a function of time.

In accordance with the device circuit, a change in the direction of the current in the circuit of the electrodes / is obtained by using the natural change in the polarity of the current in the circuit of the working capacitor battery 2 when it is charged. For this purpose, the electrodes are directly connected to the capacitor circuit 2. Thus, the charge of the capacitors in the pulse generator circuit is a duty cycle. The operation of the circuit is as follows.

With the supply of a control pulse from the control unit to the ion valve 3, the charge of the capacitor battery 2 starts through the valve and the 4 electrode circuit. At the end of the charge, the ion

No. 140289- 2., ...,

the valve goes out, and the control unit pulses the pulse, igniting the discharge valve 5, in connection with which the discharge of the condenser battery occurs. The discharge current passes through the valve 5 and the 4-electrode circuit, but in the opposite direction. Thus, the current pulses in the electrode circuit periodically change their polarity, and therefore the generator generates bipolar current pulses. Using the control unit, the delay time to and / i can smoothly change the pulse repetition frequency, and the relative distribution of pulses of different polarities in the period (-f). Battery 6 serves as

a buffer protecting the current source 7 from instantaneous overloads (current peaks). The battery can be assembled from electrolytic capacitors.

The proposed device was assembled and tested in the laboratory of electrofishing fish of the Klaipeda branch “Giprorybflot and laboratory tests showed good results.

All-Union Scientific Research Institute of Marine Fisheries and Oceanography “VNIRO notes that the electrical device scheme provides for the possible change in the frequency of pulse repetition, as well as their relative distribution, which is of great importance in electric fishing.

Subject invention

A device for electrofishing fish by creating an alternating voltage in a water-depleting electric field, including a DC generator connected to the circuit, two controlled gas-discharge valves, a discharge capacitor battery and two discharge electrodes immersed in a reservoir that are that, in order to simplify it, a capacitor battery is connected by one pole to one of the electrodes, and the other to the positive pole of the generator through one of the gates and through the other to the negative terminal Luce the generator and to the other electrode, wherein the generator is shunted capacitor to protect against overload.

F

,

Tt

i to