SU1215073A1 - High-voltage complex for synthetic testing of switch for disconnection of non-eliminated short circuit - Google Patents

Abstract

This invention relates to electrical measuring technology. The purpose of the invention is to increase the reliability of the switch by increasing the equivalence of the test when forming the restoring voltage on the test switch. The device comprises a current loop 1 consisting of a shock generator 2, a safety switch 3, a switching-on apparatus 4, a reactor 5, a tripping element 6, and conclusions 7 for connecting the switch to be tested. The voltage block 9 contains inductance 10. a short-circuited line, a reactor 11, a surge current 12, a capacitor battery 13 and a restoring voltage shaping unit 14. In the description, embodiments of a restoring voltage forming unit 14 are given. 4 hp f-ly, 5 ill.

Description

The invention relates to electrical measuring equipment and can be used to test the breaking capacity of a high voltage switch in the disconnected short circuit mode.

The purpose of the invention is to increase the reliability of the switch by increasing the equivalence of the test during the formation of the restoring voltage on the test switch,

FIG. 1 is a schematic diagram of a high-level complex for synthetic testing of a switch; in fig. 2 ... 5 are embodiments of a restoring voltage shaping unit.

The high-voltage complex for synthetic testing of a circuit breaker, disconnection of an unreleased short circuit, contains a current circuit 1 consisting of a series-connected shock generator 2, a safety switch 3, a switch-on device 4, the first reactor 5, a disconnecting element 6, and conclusions 7 for connecting the test switch In parallel to the shock generator 2, the protective switch 3 and the switching on apparatus 4, an additional switching apparatus 8 is connected. In parallel to the terminals 7 for connecting the test switch connected voltage circuit 9 consisting of series-connected inductor 10 shorted line, the second reactor 11, surge arrestor 12 to the capacitor bank 13. The parallel outlet 7 for connecting the test switch unit 14 is connected forming a reducing voltage.

FIG. 2, the restoring voltage generation unit 14 comprises two series-connected electrical circuits 15 and 16, the first circuit 15 consisting of a third reactor 17, a first resistor 18 and a first capacitor 19 connected in series, and a second resistor 20 connected in parallel to the third reactor 17, and the second circuit 16 consists of a fourth reactor 21, in parallel with which a third resistor 22 and a second capacitor 23 shunted by a fourth resistor 24 are connected in series, the second terminals are electr2150732

The main circuits 15 and 16 are connected to the terminals of block 14.

FIG. 3, a restoring voltage shaping unit 14 co5 holds two series-connected electrical circuits 15,16, the first circuit consisting of a third reactor 17, a first resistor 18 and a first capacitor 19 connected

10 in series, and a second resistor 20 connected in parallel to the third reactor 17, and the second circuit 16 consists of a fourth reactor 21 in parallel with which

t5 are connected in series the third resistor 22 and the second capacitor 23, as well as the fourth resistor 24, the second terminals of the electrical circuits 15 and 16 are connected to the terminals of the block 14.

20 In FIG. 4, the reset voltage generator unit 14 contains two series-connected electrical circuits 15 and 16, the first circuit 15 consisting of a third 25 reactor 17, a first resistor 18 and a first capacitor 19 connected in series, and a second resistor 20 shunting the third reactor 17 and first resistor 18 and

3Q second circuit consists of a fourth reactor 21, in parallel with which are connected in series the third resistor 22 and the second capacitor 23 shunted by the fourth resistor 24, the second terminals of the electrical circuits 15 and 16 are connected to the terminals of the block 14.. .

FIG. 5, the voltage generating unit 14 of the voltage JV comprises two series-connected electrical circuits 15 and 16, the first circuit 15 consisting of the third reactor 17, the first resistor 18 and the first capacitor 19 connected in series, and the second resistor 20 shunting the third reactor 17 and the first resistor 18, and the second circuit 16 consists of a fourth reactor 21, in parallel with which are connected in series the third resistor 22 and the second capacitor 23, as well as the fourth resistor 24, the second terminals of electrical circuits 15 and 16 are connected to the leads of block 14.

55 High-voltage complex operates as follows.

In the initial state, the protective switch 3, tripping element 6,

45

The tested switch is closed, the capacitor battery 13 is charged from an external energy source (not shown), the switching on device 4 and the additional switching on device 8 are opened.

The test is started by switching on the switching-on apparatus 4, as a result of which a half-wave sinusoidal current passes through the circuit of circuit 1 of the current through the first reactor 5, the tripping element 6 and the test switch. When the current reaches its maximum value, the contacts of the disconnecting element 6 and the switch being tested open and electric arcs appear between the contacts. To increase the current decay rate in the tested switch on the decay of this half-wave current, an additional switching device 8 is activated, as a result of which the current drop in the tested switch determines the inductance of the first reactor 5 and the sum of the voltages on the arcs of the switching off element 6 and the disconnected switch chatel

Shortly before the current passes through zero, the discharge switch 12 triggers and the circuit voltage 9 begins to flow through the switch under test, the frequency of which is determined by the capacity of the capacitor battery 13, the inductance 10 of the short-circuited line ijL of the second reactor 11.

Initially, the total current passes through zero in the tripping element 6 and the arc goes out in it, as a result of which the test switch turns out to have a voltage connected only to the circuit of circuit 9, the parameters of which correspond to the parameters of the full | Power circuit, after the arc is extinguished in the switchable switch , a transient voltage is restored on it, the parameters of which are determined by the structure and the values of the nominal values of the elements of the unit for the formation of a restoring voltage.

The structure and values of the denominations of the elements of the unit 14 for restoring the voltage of the voltage are determined from the condition of equality of the input operator resistances to each other and the original circuit by the methods of synthesis of passive electric circuits. The original circuit contains a series-connected short-circuited line model and a model of the power supply system. From the point of view of energy supply to the arc of the tested switch and other conditions of equivalence of tests to actual conditions of the switch in

power system, all structures of the restoring voltage generation unit 14 are equivalent.

The proposed high-voltage complex for synthetic testing of a switch for disconnecting an unresolved short-circuit can also be used in direct test circuits.

In this case, the equivalent test power of the percussion generator rises, since the inductance-bone of the short-circuited line enters the internal inductance of the generator and does not reduce its short-circuit current.

Using the proposed structures of unit 14 reduces the total capacitance used to form a two-component regenerative voltage by a factor of about 2, which is an additional factor that increases the equivalence of the switch tests. The smaller the total capacitance of the capacitors, the smaller the portion of the charge capacitor

The batteries are consumed by the charge of the capacitors of the block of formation of the restoring voltage, and the closer the values of the return voltage in the synthetic circuit and in the direct test circuit coincide.

Claims (5)

1. A high-voltage complex for synthetic testing of a circuit breaker for disconnecting an unreleased short circuit, containing a current loop from a series-connected shock generator, a safety switch, and a switch-on device, the first reactor, the disconnecting element and the terminals for connecting the test switch, in parallel with which the voltage circuit is connected from the series-connected inductance of the short-circuited line, the second reactor, the discharge voltage and the capacitor bank, the restoring voltage forming unit, the first terminal of which is connected with a second terminal for connecting a test switch, characterized in that, in order to increase the reliability of the switch due to the equivalence of tests, an additional switching apparatus is introduced into it, the second output of the recuperating voltage shaping unit is connected to the first output for connecting the test switch, and the second inductance terminal of the short-circuited line, and the first output to the second output of the capacitor battery. 2 о Pop-up complex 1, characterized in that the restoring voltage shaping unit contains two series-connected electrical circuits, the first circuit consisting of a third reactor, a first resistor and a first capacitor connected in series, and a second resistor connected in parallel to the third reactor, the second circuit is from the fourth reactor, in parallel with which the series-connected third resistor and the second capacitor shunted by the fourth resistor are connected; the second terminals are electric ical circuits are connected to the terminals of the block 3. Pop-1 complex, characterized in that the regenerative voltage shaping unit contains two series-connected electrical circuits, the first circuit consisting of a third reactor, a pair resistor and a first capacitor connected in series, and a second resistor connected in parallel to the third reactor, the second circuit is from the fourth reactor, parallel to which is under ---. I Ng C this . ± J “2” - VNIIPI Order 904/54 Circulation 730 Subscription .V in .. “. ". w ".." .. ".,". "----- - Branch PPP Patent, Uzhgorod, Project Project, 4 five five 0 The fourth resistor and the third resistor and the second capacitor connected in series are connected; the second terminals of the electrical circuits are connected to the terminals of the unit. 4. Pop-1 complex, characterized in that the formation voltage recovery unit 0 contains two series-connected electrical circuits, the first circuit consisting of a third reactor, a first resistor and a first capacitor connected in series, and a second resistor shunting the third reactor and the first reactor, and the second circuit - from the fourth reactor, in parallel with which the third resistor and the second capacitor, shunted by the fourth resistor, are connected in series, the second terminals an insulating circuit connected to the output unit. i 5. Complex pop.1, which differs from the fact that the block for the formation of a restoring voltage contains two series-connected electrical circuits, the first circuit consisting of the third reactor, the first resistor and the first capacitor connected in series, and the second a resistor shunting the third reactor and the first resistor, and the second circuit is from the fourth reactor, in parallel with which the fourth resistor and the third resistor and the second capacitor connected in series, the second terminals of electrical circuits oedineny a block pin. 1/4. ; " five 0 five