RU8166U1 - TWO BAND TV ANTENNA - Google Patents

Abstract

A dual-band television antenna, consisting of two frames located in the same plane with a perimeter equal to the average wavelength of the main range, characterized in that the frames are interconnected by means of short-circuit loop vibrators, the length of which is equal to a quarter of the average wavelength of the additional range, and the power is supplied point of zero potential of one of the frames.

Description

ELECTROMETRIC METER FOR LARGER CONSTANT

PACKAGE CURRENT SSFFL:

The invention relates to the field of electrical measurements, in particular, to measurements of large constant currents (BPT) without breaking the current lead and can be used to control

RZHIMOB THE OPERATIONS OF ELECTRIC SECURITY WITH LARGE SINGLE LOW TOBS.

The invention is aimed at solving the problem, which consists in providing the ability to measure the current package of tires. Such packages are used to supply powerful

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tens of kiloamperes.

Known electrometric devices for measuring BFT in the form of shunts, information about the current from which is taken in the form of an electrochemical value - voltage drop across the shunt when the measured current flows through it, see Spector S.A. Measurement of large constant currents.-L.: Energy, 1978.-S.7-20.

The disadvantages of such devices are the need to break the current paths to connect the shunt, additional power losses, limitation of the upper measurement range, difficulties in measuring the current of the bus package.

Attempts are known to build devices for measuring BBT based on the use of a portion of the current lead as a shunt. This eliminates the need for rupture of the current lead, but leads to errors because the stability of the resistance of the current lead section is very low.

The closest in technical essence to the proposed solution is a BPT meter according to A.S. 819725 (High constant current meter, publ. B.I. / 13, 1981). Such a device implements a test method for reducing errors from instability of the current lead section using

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an information processing unit connected in parallel with a portion of the current lead. Eok contains a small current pulse, a small error shunt, a voltage drop sensor, the device included, a computing unit, and a measuring organ. The algorithm for processing the signals received at the input of the computing unit is such that there is a correction of errors from the instability of the resistance of the current lead section.

However, the prototype has the disadvantage that it is difficult to measure the currents flowing along the tire packets, and

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This drawback is due to the fact that when measuring the current of the bus package, the meter can include only a portion of any bus of the package and, as a result, the current flowing through the second bus will be measured. Kevozmozemot parallel or sequential connection of sections of the tire package for. obtaining information about the total current of the packet is due to the fact that the tires of the packet are at different potentials and the connection of the bus points will be accompanied by the occurrence of significant equalizing currents due to the low impedance Ш1Ш, even with a small potential difference of the buses. Due to the presence of galvanic coupling, it is also impossible to simply connect the output circuits of the meters to obtain the total signal.

The aim of the invention is the provision of the ability to measure the current package of tires.

To achieve the goal of the claimed invention, an electrometric meter of large constant currents of a busbar package, the number of which is equal to n, includes a measuring channel containing a section of bushes through which part of the measured current flows; information processing unit that serves to eliminate errors from instability

the resistance of the bus section, and the input of which is connected parallel to the bus section; measuring device; supplemented by (n-1) measuring channels, as well as a unit for summing the output signals of the measuring channels, which has n inputs connected to the outputs of the n measuring channels, and the output of which, which is the output of the electrometer side meter, is connected to the first output of the measuring device.

The combination of these common essential features is supplemented, developed and clarified by the following particular distinguishing features that are aimed at solving the same problem; the summation block of the output signals of the measuring channels contains a power source galvanically isolated from the measuring channels, the midpoint of which is connected to the output of the first or last measuring channel; n differential amplifiers, the input terminals of which are the inputs of the summing unit, and the output signals are formed by the output terminals of the differential amplifiers 11 and the midpoint of the power supply; a voltage adder having n inputs that are connected to the output terminals of the differential amplifiers, and the output of the adder is the output of the summing unit, and the second output of the measuring device is connected to the midpoint of the power source.

In relation to the prototype of the claimed invention has the following distinguishing features. N measuring channels are being traversed, the number of which is equal to the number of package buses. The introduction of a summation block of the output signals of the measuring channels allows one to obtain a signal proportional to the current of the packet in the presence of a potential difference between the individual buses of the packet.

The essential features characterizing the essence of the claimed invention are not known from the prior art, which allows us to conclude that there is no answer to the criteria for novelty.

According to the author, the essence of the claimed invention does not follow explicitly from the prior art for specialists, since the above effect on the obtained technical result is not revealed from it - a new property of the object of the totality of features that distinguish the claimed invention from the prototype, which allows us to conclude about it

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The set of essential features characterizing the essence of the invention, in principle, can be repeatedly used when measuring large constant currents of more than tens of kilo-shatter, flowing along the current lead in the form of a package of busbars without breaking the measurement circuit, which determines the achievement of the goal, and allows us to conclude that the invention meets the industrial criterion applicability.

SUMMARY OF THE INVENTION GIANT & TOYA GR1 $ 1 PURPOSE MATERIALS

which depicted in FIG. 1 is a block diagram of a device; in FIG. 2 shows an example of the execution of the information processing unit.

The claimed invention according to the first claim contains a system f of n measuring channels, each of which includes a section of bus 2 and an information processing unit (BOI) 3. Buses (their number is equal to n) are part of package 4, the current of which is subject to measurement. The output terminals of the system of measuring channels 1 are connected to the block 5 summing the output signals (BSVS) of the measuring channels. The output of the BSVS 5 is connected to the first output of the measuring device 6.

According to the second paragraph (claims BSBS 5

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I will assign point 8 connected to a common point of the first or last measuring channel, for example, to point 9. B BSVS 5 also includes n pi ($ 10 amplifiers.

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and the output is closed - to the n inputs of the adder //. The second output of the measuring device 6 is connected to the midpoint in the power source 7.

In the process of measuring the inventive device operates as follows.

Each of the n measuring channels containing the bus section 2 and BOI 3 converts the corresponding bus currents I ,, I, ... into output signals U.JJ, -, i7, proportional

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THESE currents with some proportionality coefficient fe: and feJ,. THESE signs are pushed up to the input BSVS D clips, output

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which is connected to the measuring device 6. The input terminals of the differential amplifiers 1o form the inputs of block 5. Differential amplifiers can be made on the basis of operational amplifiers (op amps). The op-amps have an isolated power supply 7, so its middle (grounded) point 8 can be connected to any (but one) of the common points of the BOI 3, for example, to point 9. As you know, OS 1 has a high common mode voltage suppression coefficient (i.e. voltage acting on both inputs simultaneously), responding only to the voltage between the inputs. As a result, the voltage U. 17, ..., U

are brought to the level of the ground plane of the earthed point 8. Further, these voltages

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It is made on the same basis as an op-amp and is powered by a source 7.

An example of execution of the processing unit information 3 of each measuring channel is shown in figure 2. The principle of its action is as follows. Sensor D measures the voltage drop U from the measured current I. In section 2 of the bus with resistance R. /. , R.. In the presence of a current pulse J from the generator, the memory device measures and remembers the increment of voltage drop in section 2 caused by the current pulse:. zashsharzashchey device of the memory detects a fall

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voltage on the shunt I from the current: 17. "- L1". Shunt has

small errors. Voltages and, W, U are applied to

WB computing unit, which processes them in accordance with the expression:

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R. In this case, the errors of current measurement are determined by the stability of the generator G and the errors of the shunt W.

Thus, the claimed solution takes precedence over the prototype, which consists in the possibility of measuring the current packet bus.

The inventive electrometric meter with more than 1 constant currents of the tire package provides significant interest for the national economy, as it will allow measuring BBT with a practically unlimited upper limit without breaking the conductor.

The claimed solution does not adversely affect the state of the environment.

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Claims (1)

A dual-band television antenna, consisting of two frames located in the same plane with a perimeter equal to the average wavelength of the main range, characterized in that the frames are interconnected by means of short-circuit loop vibrators, the length of which is equal to a quarter of the average wavelength of the additional range, and the power is supplied point of zero potential of one of the frames.