JPS6046471A - Testing method of winding - Google Patents

Abstract

PURPOSE:To compensate the charging current of windings to be tested to increase test performance, and take simultaneously a dielectric strength test of many pcs. of windings to be tested by connecting a variable reactor to the high voltage side of a testing transformer in parallel to the windings to be tested. CONSTITUTION:The high-voltage variable reactor 4 is connected to the high-voltage side of the testing transformer 2 in parallel to windings 3 to be tested. The voltage regulator 1 connected to the low-voltage side of the transformer 2 is increased slightly from the lowest side to flow the charging current measured by an ammeter A3 provided between the earth-side common connection point of the reactor 4 at the high-voltage side of the transformer 2 and a transformer 5 for an instrument, and the ground; and the reactor 4 is adjusted to minimize the high-voltage side current measured by an ammeter A2 provided to the high-voltage side winding of the transformer 2. Then, the reactor is adjusted up to a necessary voltage while a low-voltage side ammeter A and the high-voltage side ammeter A2 are monitored.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for testing the withstand voltage, etc. of electric machine windings.

Conventionally, as shown in Figure 1, the voltage was applied immediately from the test transformer (2) to the winding under test (3).
3) With the increase in capacity, the test transformer (2) and voltage regulator (]) must have a capacity commensurate with the increase in capacity. Furthermore, in order to increase the capacity of the winding to be tested (3), each winding had to be tested separately.

The present invention compensates for the charging current of the winding under test by inserting a variable reactor on the high voltage side of the test transformer, thereby increasing the testing capacity of the test transformer and voltage regulator, and simultaneously increasing the testing capacity of the test transformer and voltage regulator. Make it possible to apply withstand voltage to the test winding.

An embodiment of the present invention will be described below with reference to FIG. The same parts as in Fig. 1 are given the same reference numerals.

I'll omit the explanation. In other words, a high pressure variable reactor (4
) into the high voltage side of the test transformer (2). Connect the wires in this way, raise the voltage regulator (1) a little above the lowest level, apply the charging current measured by the ammeter 3, adjust the high-voltage reactor (4), and set the test voltage measured by the ammeter 2. Make sure that the high voltage side current of the transformer (2) is the lowest. In reality, if it is made a little capacitive, the power factor on the power supply side will be close to 11C at the test voltage value due to magnetic saturation of the test transformer (2) when the voltage is increased. After that, raise the necessary voltage while monitoring the ammeters ① and ②2.

Next, another embodiment of the present invention will be described with reference to FIG. Since the high-voltage variable reactor (4) is expensive, it is almost satisfactory to use the high-voltage tapped reactor (6) considering the voltage used, the voltage of the test transformer (2), and the winding under test (3). You can do a fast test.

According to the present invention, a large number of windings to be tested can be subjected to withstand voltage tests at the same time, thereby increasing the testing capacity of existing equipment. Furthermore, since a large number of windings to be tested can be tested simultaneously, it is possible to easily grasp the degree of variation in the performance and failure of individual windings.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram showing a conventional winding test method, Fig. 2 is a circuit diagram showing an embodiment of the winding test method of the present invention, and Fig. 3 is a circuit diagram showing an embodiment of the winding test method of the present invention.
FIG. 7 is a circuit diagram of section J showing another embodiment of the present invention. l... Voltage regulating type, 2... Test transformer 13... Winding under test, 41. High voltage reactor 15...Instrument transformer, 6...Reactor with high pressure tap. Agent: Raf Physician Noriyuki Chika

Claims (2)

[Claims] (1) A winding test method in which the winding under test and a variable reactor are connected in parallel to the secondary side of a test transformer. (2) The variable reactor is adjusted so that the combined impedance on the secondary side becomes capacitive when the voltage on the secondary side of the test transformer is low. Winding test method.