• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    1. Measuring arrangement for electric currents, comprising two transformers (1, 2) wherein the current to be measured flows through the primary winding (5) of the one transformer (1) and a current representing the current to be measured flows through the primary winding (6) of the other transformer (2), characterized in that each of the transformers (1, 2) includes a magnetic core and both have substantially the same transformation characteristic, that the secondary windings (3, 4) of both transformers are connected in parallel, and that an active four-terminal network (7) is connected to the juncture of the secondary windings (3, 4) said network being controlled by the difference between the currents of the secondary windings (3, 4) and driving the current in the primary winding (6) of the other transformer (2).
    公开号:SU1394153A1
    申请号:SU807771460
    申请日:1980-10-29
    公开日:1988-05-07
    发明作者:Эрмиш Йохен；Брендлер Вернер
    申请人:Институт "Испытательная Лаборатория Мощных Электрических Аппаратов" (Инопредприятие)；
    IPC主号:
    专利说明:

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    : The invention relates to the measurement of electric currents, in particular those which, because of their magnitude, cannot be measured directly. J
    A current transformer is known, through whose windings the measured current flows, and the signal of the secondary winding is proportional to the measured current.
    The disadvantages of such a current transformer are the presence of a load in the secondary circuit and a power take-off for measurement, which affects the error
    measurements.
    Known measuring current transformer with error compensation l
    hanging
    from the impedance of the load (DE - AS 1 303 532; c | p. G 01 R 1/20, 1972), This is carried out with the help of an amplifier with feedback and an inductive element of communication. The communication element is the so-called magnetic equivalent of the instrument transformer, i. E. the material of both magnetic cores has the same magnetic characteristic. The amplifier compares the voltages of the transformer and the communication element, depending on the level of current measurement, and feeds in addition an internal full load and a current transformer. ; This amplifier compensates for a per- sonal error, however, it does not provide the measuring power of the current transfer mater, so the measuring 1 | transformer itself must be calculated liaH for the required total power from the load resistance.
    The aim of the invention is to measure the accuracy of measurements in a wide range of load variation, cost reduction, since it is possible to use built-in current transformers in operation.
    Figure 1 is a schematic diagram of a measuring device; Fig. 2 is an amplifier control circuit; Fig. 3 is a diagram of a measuring device for measuring direct currents; 4 is a diagram of a device in a zero-current transformer; FIG. 3 is a diagram of a device with a gal ™ vanishing between a measuring circuit and an amplifier; Fig.6 is a diagram of the device with the indication of the measured 0
    five
    0
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    Rated current using ammeter alternating current.
    The device contains main 1 and additional 2 current transformers, which contain secondary 3 and 4 and primary 5 and 6 windings, respectively, amplifier 7 and indicator 8, while the conclusions of the secondary winding 3 are connected to the corresponding terminals of the secondary winding 4 and the inputs of amplifier 7, the outputs of which connected to each other through a serially connected primary winding 6 and indicator 8.
    In addition, the device (Fig. 2) contains additional secondary windings 9 and 10, with one input of amplifier 7 connected through series-connected additional secondary windings 9 and JO connected to the second input of amplifier 7.
    The device (FIG. 3) contains additional secondary windings 11 and 12, the outputs of which are interconnected and with the outputs of the alternating voltage generator 13, respectively. The main current transformer is made in the form of a zero current transformer containing primary windings 14.
    The device (FIG. 3) contains an isolation transformer 15, which is connected to the corresponding outputs of the amplifier 7 by the terminals of the primary winding, and the terminals of the secondary winding of the connection 1-1s in series with the primary winding 6 and the indicator 8. The output of the indicator 8 is connected to the first output of the diode diagonal rectifier bridge 16, the second output of which is connected to the output of amplifier 7, the outputs of the diagonal of rectified voltage are connected to the terminals of the ammeter 17 of direct current.
    The device works as follows.
    The current transformers 1 and 2 have the same characteristics, and the currents in the secondary windings 3 and 4 are equal, therefore, the current in the primary winding 6 of the additional current transformer 2 is proportional to the modulus and phase of the current being measured. If the measured current flows through the primary winding 5, the amplifier 7 applies a current of Hbi to the primary winding 6 that the voltage between the two connecting points of the secondary windings 3 and 4 approaches zero and in both
    313
    transformers 1 and 2 are set to the same magnetizing force related to the length of the magnetic path. In this case, the load value does not affect the transfer characteristics of the device, since the power dissipated by the load impedance of the indicator is set by the amplifier 7.
    Transformer 1 is complete in the form of a single-turn transformer on a ring core, since it practically does not draw power from the current measurement circuit.
    The amplifier 7 is controlled by the difference of the inductions arising on the windings 9 and 10. Such a scheme allows to simplify the calculations in the case of large measured currents in the primary winding 5 and the complexity of calculating the current ratio of the windings in the primary winding 5 and the secondary windings 3 and 4.
    The alternating voltage generator 13 allows the measurement of direct current. In the absence of a measurable current, the excitation in the magnetic circuits of transformers 1 and 2 are equal, therefore, there is no measurement signal. The constant current in the primary winding 5 breaks the equilibrium and the indicator 8 registers the amount of current flowing.
    The average magnetizing force in transformer 1, related to the length of the magnetic circuit, is obtained on the basis of currents in several primary windings 14 of the main current transformer 1, respectively, the average magnetizing force of the additional current transformer 2, referred to the length of the magnetic circuit, is determined by the current in the primary circuit. winding 6, and this current, taking into account the sign of the corresponding-VT sum of currents in the primary windings 14.
    An outlet transformer 17 allows the device to be used in galvanically isolated circuits. The inclusion of a diode pilot bridging bridge 16 makes it possible to use an ammeter 17 of direct current for measurements, through which in this case a current is proportional to the measured current.
    The proposed device allows to increase the measurement accuracy and reduce the cost of use.
    53
    权利要求:
    Claims (7)
    [1]
    1. An electrical current measuring device containing a main current transformer, an amplifier and an indicator, the secondary windings of the main current transformer being connected to the amplifier inputs, characterized in that, in order to improve the measurement accuracy in a wide range of load variation, an additional transformer is inserted into it current with a transfer characteristic identical to that of the main current transformer, with the first output of the primary winding of the additional current transformer connected to the first the second output of the amplifier, and its second output through the indicator is connected to the second output of the primary winding of an additional current transformer, the secondary windings of the additional and main current transformers are interconnected in a sequence that ensures the latter is close to zero, and they are also connected to the first and second inputs amplifier, respectively.
    [2]
    2. The device according to claim 1, characterized in that both transformers are provided with an additional secondary winding each, the first terminals of the additional windings are connected to each other, and the first and second inputs of the amplifier are connected to the second terminals, respectively,
    [3]
    3. The device according to claim 1, characterized in that, in order to extend the functionality by measuring the direct current, it contains additional secondary windings in both current transformers and an alternator, and the first terminals of the additional secondary windings are interconnected respectively and
    with two alternator outputs
    [4]
    4. The device according to Claim 1, which is the fact that the main current transformer is made single-turn with ring magnetic conductor.
    [5]
    5. The device according to Clause 1, about the tl and - that the main current transformer is complete in the form of a zero-sequence current transformer.
    [6]
    6. The device according to ri.l, about tl n - h is that it additionally contains a separate transformer, with the first output of the secondary winding connected to the first BbiJM output of the primary winding of the additional current transformer, and W {the output of the secondary winding of the transformer is connected to the first output of the indicator,
    I
    [7]
    7. The device according to claim 1, about t l and - h | ayutees so that as
    Phi2.1
    the indicator uses a DC ammeter, and the device additionally contains a diode rectifier bridge, with the second output of the amplifier and the second output of the primary winding of the additional current transformer connected to the diagonal of the alternating voltage of the diode rectifying bridge, and its diagonal of the direct voltage is included DC ammeter.
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE603514C|1927-06-01|1934-10-02|Siemens & Halske Akt Ges|Dry plate rectifier arrangement with upstream amplifier, especially for measuring purposes|
    US2358480A|1942-02-12|1944-09-19|Int Standard Electric Corp|Current measuring device|
    DE1076260B|1958-06-06|1960-02-25|Hans Ritz Dr Ing|Current transformer with two cores and error compensation through an electronic amplifier|
    DE2632377C2|1976-07-19|1987-10-01|Richard Dr.-Ing. Friedl|
    DE2812303C2|1978-03-21|1983-12-29|Deutsche Zähler-Gesellschaft Nachf. A. Stepper & Co , 2000 Hamburg|Current transformer arrangement with electronic error compensation|DE3435267C2|1984-09-26|1986-10-30|ANT Nachrichtentechnik GmbH, 7150 Backnang|Current measuring device|
    GB8805245D0|1988-03-04|1988-04-07|Cambridge Consultants|Active current transformer|
    GB2282893A|1993-10-13|1995-04-19|Qifeng Xu|External simulator of current transformers|
    EP1930735A1|2006-12-08|2008-06-11|HÜTTINGER Elektronik GmbH + Co. KG|Method and device for measuring alternating current|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DD79217290A|DD157981A3|1979-11-30|1979-11-30|MEASURING ARRANGEMENT FOR ELECTRIC STROEME|
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