SU1525804A1 - Phase inditcator - Google Patents

Abstract

The invention relates to electrical engineering. The purpose of the invention is to increase the reliability of information on the phase sequence. The phase indicator contains the first series circuit, which is connected between the first and second phases of the network. A second series circuit is connected between the second and third phases of the network. Each circuit consists of a series-connected capacitor and a resistor, and their resistance at the frequency of the monitored network is equal. The display elements are made threshold and some of the findings connected to the middle points of the serial circuits, and the other findings are connected to the third and first phases. If the phase rotation is correct, then one element of the display is lit, and the other is not. In the case of reverse phase rotation, their glow changes in places. 4 il.

Description

one

(21) 4295032 / 24-07

(22) 08/10/07

(46) 30. L.89. Bul № 44 (75) A.Ya. Druzhinin

(53) 52.316.925 (088.8)

(56) USSR Author's Certificate No. 936191, cl. H 02 H 7/09, 1978..

USSR author's certificate 1259348, cl. H 02 H 7/09, 1985.

(54) FACTOR

(57) The invention relates to electrical engineering. The purpose of the invention is to increase the reliability of information on the phase sequence. Phase indicator contains the first serial circuit that is connected between

the first and the second fa. of the network, the Second Jury a includes between, second and third | 1) a; L; n certi, {alda circuit consists of successively connected kp1-: densate and resistor, while at the frequency of the monitored network and resistance are equal. The elements of the indicator and the R-P-HY are threshold and some of them are connected by H11 with the middle-ts of pospeg electric circuits, and the other syvsdy connected with the third and Lazu;, Eu-chi phase alternation right, then light one element N call; -i1-, on the other hand, does not have a rj ;, Urn oorat-n: - the coupling of phases is reduced to them (tf MR.S-tami. 4 ill.

The invention relates to electrical engineering and can be used to control a three-phase AC network in those cases, but working conditions on an electrical installation require a well-defined sequence of alternation of phases.

The purpose of the invention is to increase the reliability of information on the phase sequence.

FIG. 1 shows a phase indicator circuit for a three-wire network; in fig. 2 is its voltage chart; in fig. 3 is a phase diagram for a four-wire network; in fig. 4 is his stress diagram

Phase indicator for three-wire network (Fig. 1) contains the first serial RC-circuit of resistor 1

and a capacitor 2 connected between the nerve 3 and the second 4 phases of the network, the second successive RC-ueiib from the resistor 5 and the capacitor 6 connected between the second 4 and the third 7 fg. the networks, the first and second KC circuits, are connected to the second phase by the same type of elements - resistors 1 and 5, the first 8 and second 9 sjreMeHTfci indicators are connected by the first terminals to the middle points of the first and second RC circuits, and the second terminals, respectively, to the third 7 and the 3 phase network,

In phase indications-1e for a four-wire network (FIG. 2), the second terminals of elements 8 and 9 of the indicator are connected to the neutral wire 10 of the network.

SP

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 Phase indicator works as follows.

With direct phase rotation, as shown in FIG. 1, the voltage between the points m and C is minimal, while the voltage U g (Fig. 2) is not enough to unlock the threshold display element 8, so it does not light up. The voltage between the points p and A is maximal, while the voltage exceeds the threshold for unlocking the display element 9, a current passes through it and it is lit. When the phase order changes, for example, by exchanging phases A and C, the indication element is connected to a different phase: element 8 to phase A, and element 9 to phase C, and in the diagram in FIG. 2, triangle ABT and SVP are transformed into triangles AVP and SW. In this case, the points of the type are reversed, and the minimum is the voltage b

X (9

while element 8, the voltage U, j becomes maximum. As a result, with reverse phase rotation, only the display element 8 is lit.

In the phase indicator shown in FIG. 3, with direct phase rotation, the voltage between the points m and O is minimal, while the voltage U (Fig. 4) is not enough to unlock the threshold element 8 of the display, so it does not light up. The voltage between the points p and O is maximum and corresponds to the voltage i., „(Fig. 4),

X x 3

It exceeds the threshold for unlocking element 9, therefore, it is illuminated by the passage of current. In the case of reverse phase rotation, for example, by changing the phases A and C, the vectors L and Uj 4 are replaced by the vectors U and U, which are interchanged with the vectors and, and and, like the points type. As a result, the minimum is the voltage on the element 9, and the maximum is on the element 8, which is lit by the passage of current.

As a threshold, display elements can be used as elements that combine

functions of indicator and threshold, and elements of two elements, each of which performs its function. Passing through a load element, for example, a gas-discharge lamp element 9 indica- 25

thirty

35

40

45

50

55

0

five

0

five

0

five

0

five

0

five

 TLO with ignition voltage 145– 185 V, current in each half period of the network. increases the efficiency of use of the display element.

In the phase indicator shown in FIG. 1, the minimum voltage on the display element 1; „„ ,. , 0.51 U ,, where and is the linear voltage of the controlled network. With a 220V mains voltage, this is 112V.

In the phase indicator shown in FIG. 3, the minimum voltage on the display element H,. "", 0, 3 U, that, with a voltage of 220 V, is 66 V.

The amplitude values of the stresses — the maximum — in the phase indicators shown in FIG. 1 and 3 are respectively 1.9 and and 1.1, and that; when the voltage of the 220 V network is 418 and 242 respectively.

The specified maximum and minimum voltages allow the use of a wide range of different display threshold elements, both light emitting devices and various relays.

Claims (1)

With the use of the proposed phase shift, the reliability of the information is ensured with different phase rotation. Invention Formula Phase indicator containing the first serial KS circuit connected to the terminals for switching between the first and second phases of the network, the second serial RC circuit connected to the terminals for switching between the second and third phases of the network, and the first display element connected by the first output to the middle point of the first RC circuit, characterized in that, in order to increase the reliability of information on the order of phase rotation, a second display element is additionally introduced in it, the first terminal of which is connected to the midpoint of the second RC circuit, the first and second RC circuits are connected to the terminal for connecting to the second phase of the network with the same type of elements, the first and second elements of the display are made threshold, their second terminals are connected to the terminals for connecting the third and first phases with the neutral wire, respectively, and each RC the capacitor resistance circuit at the frequency of the monitored network is chosen equal to the resistance of the resistor. 1 FIG. g Fig.Z FagL