On-site partial discharge measurement device and method for dry-type grounding transformer
A technology of grounding transformers and measuring devices, which is applied in the direction of testing dielectric strength, etc., can solve problems such as difficult maintenance work and unidentifiable parts, and achieve the effects of reducing test costs, simple circuit structure, and improving work efficiency
Active Publication Date: 2020-06-30
ELECTRIC POWER SCI & RES INST OF STATE GRID TIANJIN ELECTRIC POWER CO +2
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Problems solved by technology
The partial discharge measurement of the dry-type grounding transformer should adopt the three-phase pressurization method. Since the high-voltage winding of the dry-type grounding transformer adopts the Z-type connection method, the part where the partial discharge occurs cannot be identified when the voltage is applied to the three phases at the same time. Difficulties in overhaul work
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Embodiment Construction
[0019] Embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.
[0020] Design principle of the present invention is:
[0021] like figure 1 As shown in (b), remove the neutral point connecting wire of the high-voltage side winding of the dry-type grounding transformer, lead it out from the X, Y, and Z terminals of the high-voltage winding and ground it through the detection impedance ZkA, ZkB, and ZkC. Apply the test voltage u between the ao terminals of the low voltage side and short-circuit the bo terminal, according to the magnetic circuit structure and the principle of electromagnetic induction, there is a voltage u of equal magnitude and opposite direction on the ax and cz windings, and the voltage on the by winding is zero . Correspondingly, the voltage U is induced on the high-voltage windings AA', CC', XX', ZZ', while the voltage on the high-voltage windings BB', YY' is zero. Among them, the magn...
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The invention relates to a dry type grounding transformer field partial discharge measuring device and method; the measuring device is featured by comprising a control unit, a single phase frequency conversion power supply, a single-phase excitation transformer, a measuring unit, a switching unit and a display unit; the control unit is respectively connected with the measuring unit, the switchingunit and the single-phase frequency conversion power supply; the switching unit is connected with a low voltage side three-phase winding and a low tension side winding neutral point; the measuring unit is connected with a detection impedance of the dry type transformer; the control unit controls the single-phase frequency conversion power supply, and boosts the voltage up to the test voltage through the single-phase excitation transformer; the switching unit can realize test voltage output and special terminal short circuit according to a control unit control order. The method employs a single-phase voltage adding mode and automatically replaces the voltage adding side test wires, thus fast and accurately identifying the partial discharge generation position, effectively improving work efficiency, and reducing test costs.
Description
technical field [0001] The invention belongs to the technical field of high-voltage testing of transformers, in particular to an on-site partial discharge measuring device and method for dry-type grounding transformers. Background technique [0002] Partial discharge level is a key index to measure the pouring process and production quality of insulation materials for dry-type grounding transformers. Burning or explosion of dry-type grounding transformers due to poor production technology occurs frequently, so measuring its partial discharge level is very important to ensure the safe and stable operation of the power grid. According to the national standard GB1094.11, the partial discharge measurement of dry-type grounding transformers should adopt the three-phase pressurized method. The corresponding test equipment is large in size and heavy in weight, and lifting facilities are required to complete the handling of the test equipment. Dry-type grounding transformers are ge...
Claims
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IPC IPC(8): G01R31/12
Inventor 王伟王楠张弛张鑫冯军基
Owner ELECTRIC POWER SCI & RES INST OF STATE GRID TIANJIN ELECTRIC POWER CO