发明名称 |
D.C. CURRENT TRANSFORMER CIRCUITS |
摘要 |
A D.C. current transformer (used for measuring D.C.) comprising a common primary winding and a pair of saturable magnetic cores on which respective secondary windings are wound and connected in opposite series in series to a source of alternating e.m.f., is provided with phase-sensitive device for determining the sense of the unknown D.C. in the primary winding. The phase sensitive device periodically senses and integrates the voltage (whose waveform is the -45 DEG to +45 DEG portion of a sine wave) across at least one of the secondary windings. The sense of the integrated waveform depends on whether said voltage is initially positive or negative, and is determined by the sense of the unknown D.C. in the primary winding. Preferably said voltage is sensed at each half cycle of said alternating e.m.f. |
申请公布号 |
DE3463850(D1) |
申请公布日期 |
1987.06.25 |
申请号 |
DE19843463850 |
申请日期 |
1984.03.07 |
申请人 |
ASSOCIATED ELECTRICAL INDUSTRIES LIMITED |
发明人 |
AINSWORTH, JOHN DESMOND |
分类号 |
G01R15/18;G01R19/14;(IPC1-7):G01R19/20 |
主分类号 |
G01R15/18 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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