Method for determining test parameter of winding and sleeve of power transformer
A technology for power transformers and test parameters, applied in the direction of measuring electrical variables, measuring current/voltage, instruments, etc., can solve problems such as affecting power generation, power transmission, damage to transformers, etc., to avoid misoperation and illegal operations, and ensure the effect of safety.
Active Publication Date: 2010-08-18
四川中鼎科技有限公司
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Problems solved by technology
At this time, if there is no accurate calculation of the parameters, it is impossible for the test operators to observe multiple meters at the same time under the condition of high tension, and then adjust the test equipment. The harm caused by excessive parameter deviation will be direct damage worth millions. Yuan Nai and tens of millions of yuan of voltage transformers, high-voltage test damage transformer accidents often occur, greatly affecting power generation and transmission
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[0021] All features disclosed in this specification, or steps in all methods or processes disclosed, may be combined in any manner, except for mutually exclusive features and / or steps.
[0022] Any feature disclosed in this specification (including any appended claims, abstract and drawings), unless expressly stated otherwise, may be replaced by alternative features which are equivalent or serve a similar purpose. That is, unless expressly stated otherwise, each feature is one example only of a series of equivalent or similar features.
[0023] A method for determining test parameters of a power transformer winding together with a bushing, comprising the following steps:
[0024] The first step is to collect the technical data of the power transformer under test, such as voltage level, connection group, capacitance of each winding to ground and each other, no-load loss value, etc.;
[0025] The second step is to use the technical data of the tested power transformer to derive...
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The invention discloses a method for determining test parameters of a winding and a sleeve of a power transformer. The method comprises the following steps of: obtaining a capacitive reactive power component by utilizing data obtained by the design, the manufacturing and the routine tests of the transformer through using a multiple-step integral method; establishing a physical model matched with a practical situation in consideration of counteraction effects of inductive reactive power to the capacitive reactive power component in the state of each test and the variation of an active power component of each test state, and finally forming a computer model, calculating an optimum frequency of each process according to the principle of complete reactive power compensation and calculating the active power component of each time period; converting each component into test parameters, such as actual current, voltage, power, efficiency and the like and constructing a run chart of various variables. The invention has the advantages of controlling an error range between a calculated value and an actual value within 1%, providing the actual guide value for the tests, avoiding mis-operations and illegal operations and ensuring the safety of test equipment and the tested transformer.
Description
technical field [0001] The invention relates to a method for realizing high-voltage test technology of large and medium-sized power transformers, in particular to a method for determining test parameters of "measurement of long-term induced voltage and partial discharge of power transformer winding and bushing" by using variable frequency power supply. Background technique [0002] According to the regulations, before putting into operation, after overhaul and after insulation accidents, large and medium-sized power transformers, in order to check whether there are insulation defects in the primary components of the transformer, and whether the insulation level meets the requirements of relevant standards and the requirements of the manufacturer's technical conditions, the winding together with the sleeve must be carried out. Tube long-term induced voltage and partial discharge measurement, timely and effectively find defects in transformer manufacturing, installation and mai...
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Login to View More IPC IPC(8): G01R31/00G01R19/00G01R31/12
Inventor 王先秀汪智勇蒋旭平谭萍丁韬杨光
Owner 四川中鼎科技有限公司