SU1215072A1 - Apparatus for testing high-voltage alternating current equipment for disconnection of capacitive currents (its versions) - Google Patents

Abstract

The invention relates to the field of electrical engineering and can be used to test high-voltage AC apparatus for disconnecting capacitive currents. The purpose of the invention is to expand the field of application of the device by testing for large values of capacitive currents. The first version of the device contains an AC source 1, capacitors 5 and 8, reactor 2, clamps 3, resistor 9. To achieve this goal, reactors 4 and 7, capacitors 10 and 12, resistors 11 and 13, and an auxiliary disconnecting device 6 are added to it. The second version of the device contains similar circuit elements and differs from the first by another circuit connection of a chain of series-connected capacitor 10 and resistor 11. The use of each of the device variants allows for more power testing. devices without major adjustment of the device. 2 sec. zp f-ly, 2 ill. (L 01 O 1C R (/ g;

Description

The invention relates to the field of electrical engineering and can be used to test high-voltage alternating-voltage devices for switching off capacitive currents.

The purpose of the invention is to expand the field of application by testing at high values of capacitive currents, which allows testing of various high-voltage devices.

FIG. Figures 1 and 2 show schematic diagrams of the first and second versions, respectively, of the device for testing AC apparatus for switching off capacitive currents.

Fig. 1 denotes: an alternating current source 1, a first reactor 2 clamps 3 for connecting a test apparatus, a second reactor 4, a first capacitor 5, an auxiliary shutdown device 6, a third reactor 7, a second capacitor 8, a first resistor 9, a third capacitor 10, the second resistor 11, the fourth capacitor 12, the third resistor 13, the device under test 14, the first 15 and the second 16 terminals for connecting the test apparatus, the first capacitor 5, the AC source 1, the first reactor 2 and the terminals 3 for connecting the test apparatus ineny sequentially, the first terminal of the first resistor 9 is connected to the first terminal of the first capacitor 5, a first terminal of the second capacitor & connected to the first terminal 15 for connecting the apparatus under test, the second terminals of the first resistor 9 and the second capacitor 8 are interconnected.

The first terminals of the second reactor 4, the auxiliary disconnecting device 6 and the third capacitor 10 are connected to the second terminal 16 for connecting the test apparatus to the second terminal of the first capacitor 5 and the first terminal of the second resistor 11 are connected to the second terminal of the second reactor 4, the second terminals of the second resistor 11 and the third the capacitor 10 is interconnected, the first terminals of the third reactor 7 and the fourth capacitor 12 are connected to the second output of the auxiliary shutdown device 6, the first output of the third resist ora 13 and the second terminal of the third reactor 7 are connected to the first terminal of the first capacitor 5, and the second terminals of the third

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the resistor 13 and the fourth capacitor 12 are interconnected.

FIG. 2 marked: AC source 1, the first reactor

2, clamps 3 for connecting the test apparatus, the second reactor 4, the first capacitor 5, the auxiliary shut-off device 6, the third reactor 7, the second capacitor 8,

the first resistor 9, the third capacitor 10, the second resistor 11, the fourth capacitor 12, the third resistor 13 and the device under test 14, the first

15 and the second 16 terminals for connecting the apparatus under test, the first capacitor 5, the AC source 1, the first reactor 2 and the terminals 3 for connecting the apparatus under test being connected in series,

the first terminal of the first resistor 9 is connected to the first terminal of the first capacitor 5, the first terminal of the second capacitor 8 is connected to the first terminal 15 for connecting the apparatus under test, the second terminals of the first resistor 9 and the second capacitor 8 are connected to each other.

The first conclusions of the second reactor

4, the auxiliary shutdown device, 6 and the third capacitor 10 are connected to the second terminal

16DL connect the test apparatus, the second output of the first capacitor 5 is connected to the second output of the second reactor 4, the second output of the second resistor 11 and the third capacitor 10 are interconnected, the first output of the third resistor 13, the second output of the third reactor 7 and the first output of the second 11 and

the third 13 resistors are connected to the first output of the first capacitor

5, the first conclusions of the third reactor

7 and the fourth capacitor 12 is connected to the second terminal of the auxiliary disconnecting device 6, and the second terminals of the third resistor 13 and the fourth capacitor 12 are interconnected.

The first version of the device (see

FIG. 1) operates as follows.

An alternating current source 1 is closed by a switching-on apparatus (not shown) on the test circuit with the test apparatus 14 and the auxiliary shut-off apparatus 6 switched on, and the test device 14 begins to flow

The current is equal to the difference between the lagging current of the third reactor 7 and the leading current of the first capacitor 5.

After transients decay, the leading current of the first capacitor 5 will cause a voltage drop in the second reactor 4 and on the third capacitor 10, which will lead to a corresponding voltage increase on the first capacitor 5. This voltage drop exceeds the predetermined normalized value of the voltage drop in the first reactor 2 from the lagging test current of the test apparatus 14.

Then, the test apparatus 14 and the auxiliary shut-off apparatus 6 are simultaneously disconnected and, when the currents change over the zero arc, they are extinguished. As in actual conditions of disconnection of a concentrated capacitance, the transient recovery voltage at the terminals of the apparatus under test 14 is determined by the DC voltage on the first capacitor 5, the voltage of the pulsed frequency of the AC source 1 constituting the damped oscillating discharge the third capacitor 10 to the second reactor 4 through the second resistor 11 and the component associated with the increase in voltage on the branches of the second capacitor 8 and the first resistor 9 due to the termination of the flow of lagging second test current through the test apparatus 14 and the first reactor 2.

The latter two components have the same frequencies and damping decrements and are directed mutually opposite, and the first one of them exceeds the second one, which ensures the correct reproduction of the transient recovery voltage.

The device of FIG. 2 works as follows.

An alternating current source 1 is closed by a switching device (not shown) on the test circuit with the test device 14 and the auxiliary shutdown device 6 turned on, and a lagging alternating current flowing through the test device 14, which is equal to the difference between the lagging current of the third reactor 7 and the leading current of the first capacitor 5. After decay

to

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20

25

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transients, the leading current of the capacitor 5 will cause a voltage drop in the second reactor 4, which will lead to a corresponding increase in the voltage on the first capacitor 5 compared to the voltages on the third reactor 7 and on the third capacitor 10, whose capacitance is much less than the capacitance five.

This voltage drop exceeds by a predetermined normalized value of the voltage drop at the first reactor 2 from the lagging current of the test apparatus 14.

Then, the test apparatus 14 and the shut-off apparatus 6 are simultaneously switched off and when the currents pass through zero, the arcs in them are extinguished. As in the actual conditions of disconnection of the lumped capacitance, the transient recovery voltage at the terminals of the test apparatus 14 is determined by the voltage of the industrial frequency of source 1, which is a damped oscillatory and constant as a result of charging the third capacitor 10 from the first capacitor 5 through the second capacitor the reactor 4 and the second resistor 11 and the component associated with the increase in voltage on the legs of the second capacitor 8 and the second resistor 9, due to the cessation of the lagging test ka through

 the test apparatus 14 and the first reactor 2. The two damped oscillatory components have the same frequencies and damping decrements and are directed mutually opposite, and the first of them exceeds the second, which ensures the correct reproduction of the required variable regenerating voltage.

Thus, the use of both the first and second variants of the device allows us to expand the range of test capacitive currents in the direction of their increase, i.e. conduct more powerful tests

50 devices without major device adjustment.

thirty

40

45

Claims (4)

Invention Formula 55 1. Device for testing high-voltage AC apparatus for switching off capacitive currents, containing an AC source. the first and second capacitors, the first reactor, the first resistor and terminals for connecting the test apparatus, the first capacitor, the AC source, the first reactor and the terminals for connecting the test apparatus are connected in series, the first terminal of the first resistor is connected to the first terminal of the first capacitor, the first terminal The second capacitor is connected to the first terminal for connecting the apparatus under test and the second terminals of the first resistor and the second capacitor are interconnected, characterized in that After expanding the field of application, the second and third reactors, the second and third resistors, the third and fourth capacitors and the auxiliary shutdown device are introduced, the first terminals of the second reactor, the auxiliary shutdown device and the third capacitor are connected to the second clamp the test apparatus, the second terminal of the first capacitor and the first terminal of the second resistor are connected to the second terminal of the second reactor, the second terminals of the second resistor and the third capacitor are connected between the first terminals of the third reactor and the fourth capacitor are connected to the second output of the auxiliary shutdown device, the first terminal of the third resistor and the second terminal of the third reactor are connected to the first terminal of the first capacitor, the second terminals the third resistor and the fourth densator interconnected. 2. A device for testing high-voltage AC apparatus for disconnecting capacitive currents, containing an AC source, first and second capacitors, a first reactor, a first resistor and clamps for connecting a test apparatus, the first capacitor, an AC source, the first reactor and g 5 0 5 o . - the terminals for connecting the test apparatus are connected in series, the first terminal of the first resistor is connected to the first terminal of the first capacitor, the first terminal of the second capacitor is connected to the first terminal for connecting the device under test, and the second terminals of the first resistor and the second capacitor are interconnected, In order to expand the field of application, it introduced the second and third reactors, the second and third resistors, the third and fourth capacitors, and an auxiliary shutdown device, with this Volume: the first terminals of the second reactor, the auxiliary shutdown device and the third capacitor are connected to the second terminal for connecting the test apparatus, the second terminal of the first capacitor is connected to the second terminal of the second reactor, the second terminals of the second resistor and the third capacitor are connected to each other, the first terminal of the third resistor, the second terminal the third reactor and the first terminals of the second and third resistors are connected to the first terminal of the first capacitor, the first terminals of the third reactor and the fourth to the capacitor is connected to the second output of the auxiliary shutdown device, and the second terminals of the third resistor and the fourth capacitor are interconnected. 3. The device according to claim 1, characterized in that the conductivity of the third reactor is more than two times higher than the conductivity of the first condenser at an industrial frequency. 4. A device according to claim 2, characterized in that the conductivity of the third reactor is more than two times higher than the conductivity of the first capacitor at an industrial frequency. FIG. 2