SU1437800A1 - Method of measuring insulation resistance of structural members of electrolyzers - Google Patents

Description

(21) 4183002 / 24-21

(22) 1/16/87

(46) 11/15/88. Bul No. 42

(71) All-Union Scientific Research Institute of Labor Protection and Safety Engineering of Ferrous Metallurgy

(72) S.N.Karelin, V.A.Pokazaneva and V.I. Sorokin

(53) 621.382.2 (088.8)

(56) Tsapenko E.F. Insulation monitoring in networks up to 1000 V. - M .: Energie, 1972, p. 35-36.

Zhuravlin Yu.D., Mincis K.Ya. Features of electrical supply of aluminum electrolysis cells. - M .: Metallurgi, 1982, p. 67.-77.

(54) METHOD FOR DETERMINING THE RESISTANCE OF THE ISOLATION OF CONSTRUCTIVE ELEMENTS OF ELECTROLISERS

(57) The invention relates to methods for monitoring the insulation resistance of elements of an electrical circuit and can be used when monitoring the insulation condition of structural elements of electrolyzers. The purpose of the invention is to increase the reliability and simplify the method for determining the insulation resistance. The method consists in successively measuring the conductivity of the insulation of structural elements, shorting from this. ; 1kie elements of the electrical circuit, and when the first measurement short-circuit the resistance of the cell body relative to the busbar ,; in the second dimension, the insulation resistance of the body-to-ground is short-circuited; in the third, the insulation resistance of the part of the series is short-circuited. From the measured values, the resistance of the series elements is calculated. The proposed method allows periodically cont. Rolling the insulation resistance of the elements of electrolysis cells, their influence on the potential values on the housings and leakage currents. 1 з, п, ф-л, 5 Il.

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The invention relates to methods for monitoring the insulation resistance of elements of an electrical circuit, in particular the structural elements of electrical releasers.

The purpose of the invention is to increase the reliability and simplify the method for determining the insulation resistance.

The essence of the method is as follows.

The conductivities of the insulation of constructive elements are successively measured, shorting the individual elements of the electric circuit; in the first measurement, the resistance of the electrolyzer body is short-circuited relative to the busbar; in the second measurement, the insulation-body resistance is shortened by electrically connecting the electrolyzer body to ground; the third dimension is shorting the insulation resistance of the part of the series, in addition to the electrolyzer on which the measurement is made, by connecting the busbar to by land

Fig. 1 shows an electrical circuit for replacing an electrolyzer series, which is a non-switchable load; Figs 2-5 show the order and measurement schemes.

The diagrams show the resistance of the electrolysis cell 1, determined by the resistance of the molten salt through which the process current passes, the resistance 2 of the insulation of the cell body relative to the melt in the electrolysis bath, or relatively anodic (or cathode bus), as the resistance of the melt to the technological current It is small and consists of Ohms ohms, the resistance of the 3rd insulation of the electrolyzer housing relative to the ground consists of the resistances of the insulation of the housing relative to the foundation, m ,, electrolyzer has a bath meter -4, 5 jumper, zakorachivayuscha (eliminating from the measurements) necessary resistance circuit 6 substitution insulation resistance of the circuit without a electrolyzer, which are produced measurements.

In the first measurement (Fig. 2), a short-circuited resistance 2 is excluded, the resistance of parallel circuits, resistances 3 and 6, is measured,

Kz kb

compiled ie

"G

3

R.

where R j is the measurement reading

instrument at the first measurement

E3 the resistance of the insulation of the body of the electrolyzer relative to the earth, RJ - the resistance of the insulation

the parts of the series without electrolyzer on which the measurements are made.

In the second dimension (Fig. 3), the insulation resistance of the casing — ground, is eliminated — the insulation resistance of parallel circuits of resistances 2 to 6, i.e.

R, i

.RI + R

t

Where

Rh

0

five

meter reading in the second measurement

R., - resistance of the electrolyzer case relative to the busbar.

In the third dimension (Fig. 4), the busbar is shorted to the ground, i.e. measurements are made only on a controlled electrolyzer. The resistance of the parallel

resistance chains 2 Ra P-i

and J,

T,

R

Sh

R. + R

.

- the meter reading in the third dimension.

Solving the resulting system of equations s get

R.1

-qr + q ,, + q.ri

50

R -q g and + q w

where q. -;

H,

Rj

j R.r

On electrolyzers, the insulation resistance of the housing of which is relatively ground is almost O, to determine the insulation resistance of the housing relative to the busbar (R), it is necessary to perform all the measurements in FIGS. 2, 3, 4 on the adjacent electrolytic cell, then, by connecting the jumper of the housing of the two electrolyzers, perform an additional measurement on connected electrolyzers with a grounded busbar. The additional measurement is explained in the circuit shown in FIG.

When measured in FIG. 5, the shells of adjacent electrolysis cells are connected. By a jumper 7, the busbar is grounded by a jumper 5, the insulation-resistance of the body-to-ground parallel circuits and the two body resistances of both pots relative to the busbars are measured.

The proposed method allows periodically monitoring the insulation resistance of the elements of electrolysis cells, which affect the magnitudes of the potentials on the housings of the electrolyzers and leakage currents. The timely detection of electrolyzers with reduced insulation resistance (less than the minimum permissible value) allows to increase the electrical safety conditions, reduce leakage points and, consequently, reduce electric power losses.

Claims (2)

1. A method for determining the insulation of structural elements of electrolytic cells, which consists in measuring the insulation resistances of the elements of an electrical circuit of an electrolysis series, in order to improve the reliability and simplify the method for determining insulation resistance, shred a body-busbar section and measure the insulation resistance in the body-ground section, short the body-ground section and measure the insulation resistance in the body-busbar section, short a portion of the electrolysis series, in addition to the measured electrolyzer, and measure the insulation resistance on the section of the housing is earth and determine the resistance of the elements of the series by the formulas 2 R, -q + q - -fq G 1 lU 3 q - q - + q.  r and fl five 0 five 0 five 0 3 where is the insulation resistance of the case — busbar} insulation resistance of the case — earth conduction of the insulation obtained in the first measurement with a shorted insulation resistance of the case relative to the busbar; insulation conductivity obtained in the second measurement with a shorted insulation resistance of the body relative to the ground; the conductivity of the insulation obtained in the third dimension with the short-circuited part of the electrolysis series, in addition to the measured electrolyzer. 2. Method POP.1, differ-; Sch and with the fact that when the insulation resistance is ground - equal to zero, all measurements are performed on the adjacent electrolyzer, the housing of the two electrolyzers is connected with a jumper, busbar is connected to the ground and measurements are made on the connected electrolyzers. 7 , R, Fi &. one fi &. 2 Thebes. J FIG. H 0 (puz.S