SU473967A2 - Device for testing high-voltage switches - Google Patents

Description

If only the R-Co branch is connected to the terminals A-A and the amplitude of the reducing voltage on the IW (or OU) is equal to bn, then the voltage on the capacitor Co at the time to reach the amplitude of the voltage on the Io, Uc, UaB-Ui, where Ui is the voltage across the battery Cl (see Fig. 1) at time to.

If the arc is re-ignited at the time to to the IW (or op-amp), then in the circuit: capacitor Co — resistor R — battery Ci — spark PI — condenser Cd — inductance Ln begins the transient process of recharging capacitance With the main battery C b since. Since the initial voltage on the capacitor CQ is equal to b, and the final voltage is Uj, the transition voltage is

, per - - 1 - s, ---- (1 + V, i)

If there was no cooling in the specified circuit, then the 15 transition process would have the highest voltage on the capacitor Co

Uc, max -U, + - (U, + Uc,) .. - 2L /, - and ,,,

i.e. exceed the L / c value by the voltage value 2Ui. If the value of the resistor R is less than the critical, then this process will not be fully damped and the voltage on the capacitor Co may significantly exceed the voltage Uc. In this case, the voltage P is triggered, the capacitor Co is bridged by a small RO and the voltage across the capacitor Co begins to decrease. The resistor Ro is chosen so that the current in the circuit when the battery Ci is discharged to the resistors R it R does not exceed the allowable value (for resistors R and RO). It does not take into account the processes caused by the presence of the LZ-Cd branch, which is quite acceptable, since, tde n, is the number of links in the catenary line. Resistor R can only have a beneficial effect, additionally damping the transition under consideration. Similarly, on capacitors Cb. . . When the two-pole device is re-ignited in the IW (or OU) at time o, during a transient process, voltages may exceed the voltage applied to them at time 0 by an amount of 2Ui. In this case, significant currents occur in the reactors LI,. . ., Ln when

recharging these distributors. For example, in FIG. 1 in the absence of a chain circuit Lji-Сл in momeit to to reactors L,. . ., Ln is applied voltage

L7, L /, + 6, „and, + (AND ,, - b: and ,,.

In this case, the currents in the reactors are equal, respectively

and

U:

willow

IW

1 / L

Woo,

- P

When connecting branches Rn -P,. ., RO-P parallel to reactors L,. ., Ij, s ;; :: ozrs -:,: o1P10, the voltages on the capacitors Ci,. . . , C and currents passing through the reactors LI,. .. , one". In these momeit / o reactors, the voltage Vg is applied in a measuring magnitude, which leads to the triggering of the arresters P, ..., P and the process of recharging capacitors Cf. . . C "is damped by resistors Ro,. . . , Ro With an appropriate choice of the size of the resistors RO,. . ., RQ currents in reactors LI,, p and voltage across capacitors Cf. . . , Cn is essentially limited.

Subject invention

Claims (3)

1. Device for testing high-voltage circuit breakers according to ed. St. 434338, characterized in that, in order to reduce voltages and currents acting on a two-port network consisting of capacitors and reactors; resistors are installed in parallel with the reactors and are connected through discharge gaps. 2. The device according to claim 1, characterized in that, in order to reduce the voltage on a capacitor connected in series with a resistor, an additional resistor is connected in parallel with said capacitor, plug-in gap. 3. Uetroyetvo on PP. 1 and 2, from the fact that, in order to enable the switches to be tested in a non-Fault short circuit mode, a model of a short-circuited line of a given length is installed between the tested switch and the high-voltage circuit connected to it in series with a high-voltage circuit.