RU105468U1 - HIGH VOLTAGE INSULATION TEST DEVICE - Google Patents

Abstract

A device for testing insulation with increased voltage, consisting of a circuit breaker, an autotransformer, an adjustable inductor on the low voltage side, a test resonant transformer, a rectifier, a button shunting a rectifier, a current-limiting resistor, a test object, characterized in that a capacitor is additionally introduced into the primary circuit.

Description

The utility model relates to the field of electric power and can be used for testing with increased rectified voltage and alternating sinusoidal voltage of industrial frequency 50 Hz of high-voltage insulation of electrical equipment.

Known high-voltage test setup containing a circuit breaker, an adjusting column, a test transformer, a button shunting a milliammeter to protect it from overload, a rectifier, a limiting resistor, a test object [1].

The disadvantages of testing facilities of this type include low power, which provides low currents (10-40 mA) in the secondary circuit, and, as a result, the inability to test with an increased alternating sinusoidal voltage of an industrial frequency of 50 Hz of high-voltage insulation of large-capacity electrical equipment.

Known resonant high-voltage test installation, containing a circuit breaker, autotransformer, test resonant transformer, with an adjustable gap in the magnetic circuit, a rectifier, a button, a shunt rectifier, a test object [2].

In this setup, the possibility of using a resonance circuit with low attenuation formed by the high-voltage insulation capacitance and the leakage inductance of the test transformer is realized, and the effect of the disappearance of resonance during breakdown of the test object due to instantaneous change in circuit parameters is used. The resonance setting is provided by changing the inductance when adjusting the air gap in the magnetic core of the resonant transformer.

The disadvantages of this type of installation are the complexity of the design of the magnetic circuit of the test resonant transformer.

The closest technical solution to the proposed one is a resonant high-voltage test setup containing a circuit breaker, an autotransformer, an adjustable inductor on the low-voltage side, a resonant test transformer, a rectifier, a button, a shunt rectifier, a test object [3].

In this installation, unlike the previous analogues, the possibility of using a non-corroding high-voltage winding due to the small number of turns of the high-voltage winding of the test transformer and performing its single layer is realized. The design of the test transformer is greatly simplified.

The disadvantage of this type of installation is its limited scope, since they work only with high-voltage insulation of large-capacity electrical equipment. In addition, they have a very wide range of tuning the circuit in resonance, increasing the tuning time.

The technical task of the utility model is to eliminate the above disadvantages.

This goal is achieved by the fact that in a known installation comprising a circuit breaker, an autotransformer, an adjustable inductor on the low voltage side, a test resonant transformer, a rectifier, a button, a rectifier shunt, a test object, an additional capacitor is introduced into the primary circuit.

Figure 1 shows the proposed device for testing insulation with high voltage, consisting of a circuit breaker 1, an autotransformer 2, additionally introduced into the primary circuit of a capacitor 3, an adjustable inductor on the low voltage side 4, a test resonant transformer 5, a rectifier 6, a button 7, a shunt rectifier 6, current-limiting resistor 8, of the test object 9. The equivalent circuit of the test object includes a parallel connection of the insulation tank 10, and its active resistance ivleniya 11. Capacitor 3 in the primary circuit is connected in series with an adjustable throttle 4 and the primary winding of the resonant transformer 5.

Figure 2 presents the proposed device for testing insulation with high voltage, in which the capacitor 3 in the primary circuit is connected in parallel with the adjustable inductor 4 and the primary winding of the resonant transformer 5.

The device operates as follows. After turning on the circuit breaker 1, power is supplied to the primary winding of the autotransformer 2. Using an adjustable inductor 4, the value of its inductance and, accordingly, the inductance of the entire circuit for resonance is selected. Then, using the autotransformer, the required test voltage is created at the test object.

This technical solution allows the device to work with electrical equipment whose insulation has both large and small capacities. In addition, the system tuning time to resonance is reduced.

Sources of information taken into account:

1. Jacobson I.A. Tests and checks during the commissioning of electrical equipment. - M.: Energoatomizdat, 1988 .-- 120 p.: Ill.

2. Technique of high voltage theoretical and practical basis of application: TRANS. with him. / M. Beyer, V. Beck, K. Meller, V. Tsaengl; Ed. V.P. Larionova. - M .: Energoatomizdat, 1989 .-- 555 p.: Ill.

3. Certificate for utility model No. 73495 of 05.25.2008. Device for testing insulation with high voltage objects of large capacity. IPC G01R 31/06.

Claims (1)

A device for testing insulation with high voltage, consisting of a circuit breaker, an autotransformer, an adjustable inductor on the low voltage side, a test resonant transformer, a rectifier, a button, a shunt rectifier, a current limiting resistor, a test object, characterized in that a capacitor is additionally introduced into the primary circuit.