SU412573A1 - DEVICE FOR MEASUREMENT OF REDUCING ELECTRIC STRENGTH OF HIGH-VOLTAGE SWITCH - Google Patents

Description

Isab, retention, belongs to the field of research of high-voltage switches, and can be used in the laboratory of high-performance volatility to one switch for its switching capacity. A well-known Ostaoak for measuring the recovery of electrical strength (CDW) of switches, containing a circuit of alternating current and coit high (probing), female, and connected to the switch under study. The alternating current circuit contains a current source, a current-limiting reactor, including a device and a shuntyr. Auxiliary and test switches with capacity. iKoHTyp is high (probing). On the other hand, it contains a source, including an apparatus, high, a co-resistance. In order to measure the HPE, before the transition of the current 4eipe3. Zero, the voltage of the high-voltage source (probe generator) is applied to the test switch. In case of a dead zero current, an auxiliary switch opens the circuit. p, and the current and (after 1 discontinuity | I remain: the power in the test switch on its contacts shunned by a small capacitance .. (voltage divider, capacitance of wires, etc.), eksponon comes ., iapn. iarastan: no voltage before spark penetration; breakdowns occur every time when the applied voltage reaches the VEP switch value. Thus, the VEP characteristic represents the envelope of the saw-like sounding pulses and voltage pulses. ko in such an installation disable the studied switch The current loop circuit before sounding VEP is performed by an auxiliary switch, which affects the flow of current in the area of its crossing through zero, which introduces distortions in its output; depends on the magnitude of the switchable current source, current source, arc-suppressing properties of auxiliary switch. KpOLMe, there is no (there is a possibility of overload (Ren and VEP with high residual conductivity) in the switch under study due to the full fall of voltage under high-Om internal res. removed s probing genera | ra. The installation does not provide - leakage of residual current in the circuit breaker under study, which limits its use only for auxiliary switches and works only with a small capacitor shunting the circuit breaker under investigation. In the case of a case where the energy allocated by three n {rsUBO) Ya.x intercontact gap can be very strong, it can strongly detract the measured CDW.

iB in most cases, in parallel with the contacts of the test switch, B1 is turned on with significant capacitance and resistance.

The purpose of the invention is to measure HPB in switches with high post-residual conductivity, ILI in oil switches, and also to bring the test conditions in the field of current to real, as a result of eliminating the effect of the auxiliary shut-off switch.

For this, a device is known which contains a source of alternating current, (V-switch and safety switches, current-limiting peiaiKTOp, RiC-iuenb, connected to a parallel-studied switch, and sounding 1 generator), which is quickly operating. | a | WE, a catheter connected in parallel to the tank, and a saturation throttle with the drive coils, 1M (or in series with the same choke; m; and saturation), including .N1M instead of the auxiliary switch between the fast short-circuit. m. switch. As a probing generator, a gene.rao | p short Shmpulse, having a small internal resistance, which has an owl (locally with a short recorder, includes .p | ohm. , later. Target time after current zero crossing.

. Introduction of i3aKqpa4RBaiH.nH chain. The iKQpOTiKoaa; mykatele .m allows you to translate the throttle into an unsaturated state, which is sharply 1B (0 | w. current zero. The introduction of a low-power generator of short-current sounding im. pulses allows one to (measure the VE, D) in the presence of residual wiring, the bridge, and also use a choke with a negligible inductance at the installation, with its saturation.

FIG. 1 shows a setup diagram for measuring WEP; in fig. 2 - saturation throttle with constant bias; ya fig. 3 is a diagram of the probe generator .a. Short pulses.

The installation contains a source of AC current /, including 2 and a protective 3 switches, a current-wounding pea.KTdp 4 and a series-connected choke 5 of saturation, the switch 6 being investigated, synchronizing; PI | connect an RC circuit 8, which determines the speed of the recovery. , and a high-speed .ko: rotator 9. In parallel with the switch 6 under investigation, through a spark discharge 10, a unit is dis- played / a unit /: / oscillography and a generator 12 short probing pulses. The switch-on unit 13 is operatively associated with a peak transformer 7, a quick-acting short-circuit. 9. And a generator of 12 short probing and, mp. Pulses. The saturation throttle 5 (or each of the series-connected chokes) has on the twisted permalloy core 14 (see Fig. 2), in addition to the winding 15, a permanent magnet 16- (or a winding current) that carries out the magnetic current ( the norm of the ich of the calorific power permallo) in the direction of the floor of the bale being disconnected.

5 iB as a high-speed korobkozamykatel 9 {sm. f.ig. 1) (A plasma valve or a high-current high-speed rac3 | rg monitor may be named lr.

Diagram of the generator circuit 12. Short

0 probe pulses are presented on fit. 3. The generator contains a source / voltage of 17 constant voltage (la.kopitelnaya capacitance), which equals the three-electrode range of currents 18, resistance 19, current KOTQp.oe flows, maintains 5 for cyclical charging of the tank 21 (), a spark-free right-hand wire between 22 with blown air (or a cold 1-minute contact interval of the air switch), a resistance of 23 on which

 | form | M1Iryutsya- short .i.pulse high voltage, and current-limiting resistance 24 at the output of the generator.

Described On the installation works as follows.

The iB process of experience before removing VEP is closed. The contacts of the switching-on apparatus are closed. And the FOF. K KOpoTiKoro interconnects through the tested 6.

 During the last zero-current transition, the peak-transformer .7 generates a pulse and a jump, which is connected to the switch-on unit 13, which is set to the specified zero point, after a period of time required for the expected residual current to flow. Oscillator; Mycatel 9 and generator 12, based on a relaxation principle (see Fig. 3). After ignition of the 18 I1pulso discharge unit, m of the switch-on unit 13 (see Fig. 1), a capacity of 2: 1 is charged (see Fig. | 3) until the sample is received, span 22, due to blowing. small amount of restoration of electrical strength. At each breakdown of the gap 22, a short pulse .3 | 0 of the measuring voltage is generated at a resistance of 23 and 23 forms.

With the appearance of probing pulses following constant intervals, it punches through resistance 24 (see Fig. E), remaining ionized, the spark discharge 10 (see Fig. 1) and the test switch 6 at the level of instantaneous strength . The voltage at each breakdown of the test switch 1 is fixed by the oscillograph unit 11.