SU513329A1 - Isolation Testing Device - Google Patents

Description

(54) DEVICE FOR INSULATION TESTS

one

The invention relates to the field of electrical engineering and can be used to test the insulation of electrical devices with voltage pulses superimposed on a constant voltage.

The known devices of similar purpose contain sources of constant (with a current-limiting resistor) and pulse voltages, included according or opposite, and a separating element,

with the help of which the source of the POST5

stresses can be separated from the test object.

The separating element can be made in the form of a switching device.

If the constant i pulsed voltage has different polarity, the element separating the constant voltage source and the rest of the test circuit, at the time of application of the pulse, is affected by the sum of the voltages — a pulsed and previously applied constant — and at subsequent time points the voltage may be applied to a constant voltage source. it

causes an increase in the insulation of the separator element beyond the dimensions determined by one of the types of acting voltages, and the ISOLATION of a DC voltage source exceeds the dimensions determined by the voltage of this source. In ultra high voltage test installations (1.5 MB and higher), this leads to a significant increase in the dimensions of the installations due to the nonlinear dependence of the dimensions of the insulation on voltage.

The aim of the invention is to provide a device for testing insulation when super-high voltages of different polarity are applied to one another, in which these disadvantages are eliminated.

This goal is achieved by the fact that the proposed device with a separating switching device is equipped with an additional

(klcim ground) switching device, which is connected between the ground and the output of the separating switching device from the source of a constant voltage at least for the time being) and an impedance voltage.

In this case, the iiao / iimiiH DC voltage source in general does not expose a pulsed voltage, and the isolation of a divided switching device is made in accordance with the value of one of the test voltage of a constant pulse. the functions of the additional switching device can be performed by any device, the transfer of which the conductive conductive material to the non-conducting state or vice versa can be controlled externally, such as a switch, a controllable arrester, a controllable valve. This also applies to a partitioning switching device.

The operating controls of the source of impulse; the voltage separating and grounding the switching devices are interlocked, so that it ensures a sequence of operations in which, before applying the pulse pulse to the test object, the source of constant voltage first separates from the test object, and after that, the output of the dividing switching device from the source of a constant source, eg 1-: Enn, is connected to ground.

The drawing is a diagram of the proposed device.

A constant voltage 1 is connected to the test object 2 through a current-limiting resistor 3 and a section to the switching circuit aiinapaT 4, the source of the pulse voltage of the power source 5 is connected to the test object 2 through a spark gap 6, which prevents a constant voltage on the source / pinch impulse 1 from being applied to the source voltage / pinch impulse 1 to prevent the ingress of a constant voltage on the source / pinch impulse. Voltage 5. to terminal 7 of the device 4 is connected to a continuous switching device 8, which provides the connection of this point to the ground, at least, for the duration of the application. tension The device also contains a capacitive voltage divider 9, a capacitor 10, which is the sum of the capacitance of the supply wires and special capacitors, (if the latter are necessary to increase the capacity of the test object 2), a blocking device 11 providing electrical, mechanical or other the method of communication of the actuators of the apparatus 4 and 8 with the device 12, which is intended to start up the terminal impulse-. voltage 5.

The device works as follows. At the beginning of the test cycle, apparatus 4 is turned on, apparatus 8 is disconnected, a constant voltage from source 1 through resistor 3 and anniapaT 4 is applied to test object 2, divider 9 and capacitor 1O. After charging the source of pulsed voltage 5 using device 12 it is started and simultaneously or proactively, a command is issued to turn off annapaia 4 and turn on device 8 so that device 4 is turned off before device 8 is turned on. After these operations are completed, the source of constant voltage is closed on the

the ground through the resistor 3, and on the object 2 is kept constant (due to the presence of the capacity of the object 2 and the capacitances 9 and 10).

After starting the source 5, the pulse ignites the gap 6 and, being applied to the object of test 2, recharges its capacitance, as well as capacitances 9 and 1 O, to the magnitude of the pulse voltage. After the cessation of the pulse, the apparatus 8 is first turned off, and then the apparatus 4 is turned on, while applying a constant voltage to the test object 2.

Thus, the device is brought to the ready state for the next test cycle.

Claims (1)

Formula of Absorption An isolation test device containing a constant voltage source with a current limiting resistor, a pulse voltage source, and a switching device that separates these sources for the duration of the application of a pulse voltage, different the fact that, in order to reduce the level of isolation of the partition to the switching device, it is equipped with an additional switching device that connects to the ground the output of the separating switching device from the source of a constant voltage, and the working bodies of both switching devices interlocked with each other.