Capacitive-type voltage transformer testing method
A technology of voltage transformers and test methods, which is applied in the direction of instruments, measuring electrical variables, measuring devices, etc., can solve the problems of lowering voltage levels and power supply capacity requirements, high voltage levels, and inability to test, etc., to achieve lower voltage levels and power supply capacity required effect
Active Publication Date: 2016-01-27
HUAZHONG UNIV OF SCI & TECH
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[0004] Aiming at the above defects or improvement needs of the prior art, the present invention provides a test method for a capacitive voltage transformer, which can accurately obtain the overall transfer characteristics of the CVT, and significantly reduces the voltage level and power supply during the high-voltage test of the CVT. capacity requirements, which effectively solves the problem that the traditional test method cannot be tested due to the high voltage level required and the large power supply capacity under special circumstances.
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[0015] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.
[0016] It is known that the transfer characteristic of a CVT is mainly determined by its internal electromagnetic unit, and is not directly related to the capacitor voltage division ratio of the capacitor voltage divider unit. Such as figure 1 As shown, the conventional test method is to use the high-voltage end of the CVT as an input, apply a working voltage that satisfies its rated working co...
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The invention discloses a capacitive-type voltage transformer testing method. The method employs a CVT structure and wave transmission characteristics, carries out voltage increase testing through a central node between the CVT capacitive unit and an electromagnetic unit, records the voltage of the central node, a CVT output voltage, and the current of an injection node, calculates and obtains transmission characteristics, similar to actual working conditions, of a CVT. The method effectively solves a problem that a conventional testing method cannot carry out testing under special conditions because the level of a needed voltage is too high or the capacity of a needed power supply is too large, accurately obtains the overall transmission characteristics of the CVT under the conditions that the transmission characteristics are not affected and the rated condition of the electromagnetic unit of the CVT is precisely simulated, and remarkably reduces the requirements for the voltage level and the capacity of the power supply during the high-voltage testing of the CVT.
Description
technical field [0001] The invention belongs to the field of capacitive voltage transformers, and more specifically relates to a test method for capacitive voltage transformers. Background technique [0002] Compared with the traditional electromagnetic voltage transformer (IVT), the capacitive voltage transformer (CVT for short) has the advantages of high insulation strength, can reduce the steepness of lightning shock wave, low cost, and can also be used as a coupling capacitor for power line carrier communication. , Widely used in power grids with voltage levels of 35kV and above. When the primary system fails or suffers from transient intrusion waves, since the CVT contains energy storage elements such as capacitors and damping reactors, the output voltage on the secondary side cannot reflect the change in the input voltage on the primary side in a timely and accurate manner, and the transient response is poor. , and the transmission characteristics of CVT to harmonics ...
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IPC IPC(8): G01R35/02
Inventor 刘毅周古月廖爽林福昌刘思维
Owner HUAZHONG UNIV OF SCI & TECH