DE1791051C3 - Arrangement for the insulation and winding short test of induction coils - Google Patents

Description

2. Arrangement according to claim 1, characterized in that the representation shows.

indicates that the impedance ^{voltage divider ao} The arrangement illustrated in the drawing

(4,5) to the pulse transformer (9) capacitive voltage comprises as an essential component an im-

(Capacitor 6) is coupled. Pedance voltage divider with two in series

3. Arrangement according to one of claims 1 and 2. Chokes, one of which is a choke 4 as normal, characterized in that the impulse transformer _ iron core choke and the other choke is designed as a core mator (9) as an autotransformer. ^he choke S with an almost rectangular magnetization

4. Arrangement according to one of claims 1 to curve is formed. The chokes 4, 5 include 3, characterized in that the input impedance voltage divider is applied via a voltage of the peak value discriminator (24, isolating transformer 1 with a primary winding 26 Aa, 27) as a partial voltage from the pulse transformer and a secondary winding2 a constant formator (9) is removed in parallel. ³ ° AC supply voltage. To improve the

Power factor is to the secondary winding! of

Isolating transformer I a capacitor 31 is connected.

The center tap of the impedance voltage divider

The invention relates to an arrangement for isolating ^3S or the "hot" end of the core choke 5 is over

tion and winding short test of induction a capacitor 6 to a partial tap of an as

coils with a pulse transformer designed on the part of an alternating supply autotransformer

voltage to be operated pulse generator coupled to the tensioner 9. Connections 13, 17 can be used to

loading of the test object. the pulse transformer 9 made of isolation or

There is already an arrangement of the type mentioned ⁴ ° interturn short to be examined test object 14 par-

according to the German patent specification 634 370 known to be allele-switched, the pulse transforma-

in which one has the test item and a fixed capacitor 9 different taps 18, the optional

sator-comprehensive oscillating circuit is excited and the way by means of a 14 He-

Natural frequency of the resonant circuit is determined. Low switch 16 can be set to

If there is an insulation or winding ^45, one to be described below with the

In conclusion, there is a damping of the natural frequency impulse transformer cooperating apex

frequency of the resonant circuit to lower frequencies, value discriminator work in the most favorable measuring range.

there. The excitation of the oscillating circuit takes place through ten to let.

a spark gap, which is a wearing part. Also, an automatic test Lift ye GR ⁵ ° the pulse transformer 9, two Scheitelwcrtdiskrigen the necessity of observation of the minatoren together. A first peak value discriminator test specimen with parallel measuring spark gap not minator includes a performance in response to surge voltages. If, instead, an electronic measuring instrument II is used, which uses a Kopptronic oscillator, then there is an increased condenser 50 as well as an adjustable pre-construction effort. ⁵⁵ switching resistor 12 with a partial tap of the pulse object of the invention is to create a transformer 9 is connected. Compared to this, this peak value arrangement, which is improved in the case of discriminator, requires ongoing monitoring, a simple structure without the use of an operator and is therefore possible for fully wear parts, an automatic examination of automatic examination of test objects 14 in the case of test objects. This is achieved by an automatic feed which is less suitable.
A second peak value discriminator receives its pedance voltage divider, one impedance of which is an input variable through an additional transformer 22 with a Prikurvc, which acts as an insulation current forma core choke with an almost rectangular magnetizing gate and which is connected to a pulse transformer, which is connected to a pulse transformer 21, which via an adjustable parallel is coupled, to which the test object is connected in parallel ^{5 series} resistor at a partial tap of the pulse, and a transformer 9 caused by the test object is located, this partial tapping in the damping of the present example occurring in the pulse transformer being identical to that part

tap is on which the capacitor 6 is located. Hine secondary winding 25 of the boosting transformer 22 is located on a a component of the second Scheitelwertdiskriminators forming thyristor 24 whose Emitier-Kolleklor path connected in Rdne with a switching relay A on the AC supply voltage, which includes the primary winding 26 of the separation! Applied ransformators. 1 Also on the AC supply voltage is a buzzer 27 in series with a relay contact of the switching relay ο A, wherein the components 27, form an α Alarmstronikrcis.

During operation, an alternating voltage of approximately 200 V is applied from the secondary winding 2 of the isolating transformer 1 to the impedance voltage divider comprising the chokes 4.5. During a half cycle of the alternating current, the impedance of the choke 4 decreases continuously due to increasing saturation. while the impedance of the choke 5 is retained for the time being because of the rectangular magnetization curve, until almost the peak value of the voltage of the secondary winding 2 is reached. Only shortly before reaching the failure value does the magnetic core of the choke 5 suddenly go into saturation, as a result of which the voltage at the impedance voltage divider drops close to / u to the value zero. As a result, the charge on the capacitor 6, which was able to build up previously, is suddenly transferred to the pulse trans-

hm-fe

hen and induced there because of the emen very high flow changes

nul-es' of high amplitude due to the impulse flow, -puLes \ on π. Scoldings could

^ Et eggs Au'fbau! Ed.glich by one, -reckenentladung cr / idt be true, dikes oscillator, "a wesenthch
Require construction effort. West of the Prufhng

short circuit or winding circuit. so

will

a test at a guaranteed e.nw

if this reference value is essential
will. The thyristor 24 can be set to a threshold value so that any fluctuations in the peak value of the needle pulses given by the pulse transformer 9 at the selected tap 8 are not taken into account and only those needle pulses are displayed for which the amplitude is compared to the voltage value or setpoint is significantly reduced.

1 sheet of drawings

Claims (1)

Tension impulse on a specified level of patent claims: speaking bogus discriminator. Due to the almost rectangular magnetic 1. Arrangement to the core choke having the insulation and winding curve, one obtains an exclusion test Con induction coils with a sufficiently steep pulse to operate the pulse side of an AC supply voltage to the transformer without the use of a special driving pulse generator for the voltage application spark gap or an electronic oscillator , hitting the test object, which would be correspondingly expensive. By tapping through an impedance voltage divider (4, 5) connected to the supply alternating voltage of the pulse transformer voltage, via the additional transformer, an ^{almost rectangular magnetization curve, which forms an impedance of a core choke (5) with lo} components of the reference value discriminator, is controlled, which is a thydistor continuously via a relay and which can be effectively connected to a pulse transformer (9) on an alarm circuit, is coupled in parallel to which the test object (14) is that an automatic implementation of the parallel is here, and one on the part of the test - testing for a large number of specimens Erlings caused damping possible in lmpulstransfor- ¹⁵ leaves of. The invention is described below on the basis of the Zeidi- fixed value appropriate peak value setting explained in more detail, which an exemplary embodiment criminator (24, A, a. 27). an arrangement according to the invention in Schalibiid-