公开(公告)号：US4241306A

公开(公告)日：1980-12-23

申请号：US937783

申请日：1978-08-29

申请人： Russell E. Bump

发明人： Russell E. Bump

IPC分类号： G01R29/20 ,  G01R31/00

CPC分类号： G01R29/20 ,  G01R31/027 ,  Y10T307/747

摘要： This disclosure relates to a transformer terminal switching unit or fixture with specially designed output terminals and transformer attachment cables. The disclosed transformer terminal switching unit is especially useful as an accessory to the BIDDLE Transformer Turn Ratio (TTR), tester, catalogue number 55003. The design of the transformer terminal switching test fixture is especially useful to test delta-star connected, three phase utility transformers with subtractively connected winding polarity. A transformer with additive windings can also be tested with the disclosed testing fixture.

摘要翻译： 本公开涉及具有特别设计的输出端子和变压器附接电缆的变压器端子开关单元或固定装置。 所公开的变压器端子开关单元特别适用于BIDDLE变压器匝数比（TTR），测试仪，目录号55003的附件。变压器端子开关测试夹具的设计特别适用于测试三角星型连接的三相实用 变压器的绕组极性相差相近。 具有添加绕组的变压器也可以用所公开的测试夹具进行测试。

公开(公告)号：US3928799A

公开(公告)日：1975-12-23

申请号：US47148274

申请日：1974-05-20

申请人： CANADIAN PATENTS DEV

发明人： KUSTERS NORBERT L ,  MACMARTIN MALCOLM P

IPC分类号： G01R17/06 ,  G01R29/20

CPC分类号： G01R29/20 ,  G01R17/06

摘要： An apparatus for measuring potentials with great accuracy using a self-balancing current comparator. The comparator includes a variable primary winding and a secondary winding wound on a magnetic core. The primary is fed a constant current I2 and the secondary is fed with a direct current such that ampere-turns balance is achieved between the windings. A resistor R1, to which the unknown potential Vin is connected, is in turn connected to the secondary winding. An operational amplifier is connected to the junction between the resistor and the secondary winding. The output of the amplifier adjusts the turns in the primary winding and as a result when the potential across the amplifier is zero, the unknown voltage Vin R1.N2/N3. I2 where N2 and N3 are the turns in the primary and secondary windings respectively.

摘要翻译： 一种使用自平衡电流比较器以高精度测量电位的装置。 比较器包括可变初级绕组和缠绕在磁芯上的次级绕组。 初级线圈馈送恒流电流I2，二次线路馈送直流电，使得绕组之间实现安培匝数平衡。 连接未知电位Vin的电阻器R1又连接到次级绕组。 运算放大器连接到电阻和次级绕组之间的结。 放大器的输出调节初级绕组中的匝数，因此当放大器两端的电位为零时，未知电压Vin = R1.N2 / N3。 I2，其中N2和N3分别是初级和次级绕组的匝数。