• 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:
    A device for continuous supervision of the attenuation (d), dissymmetry (k) and mismatch (v) system parameters in impedence earthed power systems. The parameters are calculated from the circle diagram uEN=f(v), i.e. the relative neutral point voltage as a function of the mismatch. The circle diagram is in turn defined by two measuring points for uEN which are derived by connection or disconnection of a reactance complement between system neutral and earth. The invention improves known devices for control of condition in impedence-earthed power systems. Then the continuous a supervision of the mentioned power parameters enables, inter alia, a better detecting of high-resistive earth connection. The invention can be implemented in any computer system capable of providing the necessary measurement, control and calculating functions.
    公开号:SU1627100A3
    申请号:SU874202625
    申请日:1987-05-18
    公开日:1991-02-07
    发明作者:Винтер Клаус
    申请人:Клаус Винтер (ЯЕ)；
    IPC主号:
    专利说明:

    The invention relates to power transmission systems having reactive grounding, i.e. not direct grounding.
    The purpose of the invention is to expand the functionality.
    FIG. 1 shows a pie chart Ug f (V) of this three-phase system; FIG. 2 is a device implementing the inventive method, hereinafter referred to as the NX analyzer} in FIG. 3 and 4 are performance diagrams for a measurement program;
    control and management of the NX-analyzer.
    Bearing in mind that the criterion for evaluating the voltage at the neutral point is used to monitor and control systems, it is clear that the magnitude of this voltage should be measured. A measurement of this quantity is used to indicate an abnormal operation of a power transmission system, for example, ground-to-ground breakdown of a single phase. Resonance curves or ratios are also used.

    SI
    J16
    between the neutral voltage and the degree of detuning of the automatic tuning device of Peterson windings.
    At the same time, the applicability of the amplitude criterion for tuning the system as a whole is limited due to the fact that some voltages on the neutrals occur even in the case when the system is not damaged. In this situation, the NX-analyzer provides improved system performance. The continuously calculated values of these quantities are a set of new parameters that can be used for various control and monitoring purposes of the indicated systems. For example, the following patterns can be considered established.
    1. The degree of mismatch (V). An important condition for the operation of high-voltage power systems is the ability to control parasitic, self-emerging processes in accordance with the requirements of DIN 57288 and the need to limit current limit values.
    The existence of known such requirements is determined by the automatic Petersen winding tuning system. R most devices use the resonance curve (FW) f (V) as a control criterion and the fact that U - # reaches the maximum value at the tuning point (V 0).
    According to another technique of the ratio -Y, Јts f (d), the change in the angle depends on the degree of mismatch.
    A common feature of all known tuning methods is that they require a stepwise change in the reactivity of the neutral. The control (adjustment) process is also limited by the degree of change in reactivity. Significant advantages would be achieved if the criteria for quantifying the degree of detuning were excluded, regardless of the degree of winding adjustment in each particular case. In this case, it would not be necessary to control the neutral reaction, in addition, control of the degree of mismatch could be continuous to ensure adjustment of the reactor. The use of the NX analyzer also provides a separation of control and control functions. For many systems, only
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    IRITs are the total losses in the system, most of which are
    control, and the necessary adjustments to the core of the reactor, if necessary, could be made manually.
    2. Attenuation (d). The attenuation coefficient can also be defined as the ratio, where the resistive component of the leakage current to earth, and 1C is the capacitive component
    topic
    represses leakage across the surface of the insulator. Leakage losses increase in proportion to the contamination of the insulator surface. In areas with low precipitation, a significant accumulation of dirt on the surface of the insulator can lead to serious system disturbances. In this situation, continuous monitoring of the value of the attenuation coefficient is necessary in order to increase the efficiency of the system.
    3. The degree of asymmetry (K). By continuously controlling the degree of asymmetry or changing its active component, a highly sensitive criterion for detecting various faults in power transmission systems is obtained. In particular, attention can be paid to the possibility of detecting a component of high impedance ground losses. The asymmetry value K ± 0 ± Q g of the power transmission system contains the components of the asymmetry K ..,. etc. individual lines. They, in turn, are quite different and result from the difference in capacitances of the individual phases on the earth, due to their geometrical arrangement. Switching on or off individual phases leads to a change in the total asymmetry value, which is measured by an NX analyzer, which limits the practical use of the value of Kg ag or its relative change D K g the ground test criterion.
    In order to circumvent this limitation, the NX analyzer generates a different criterion than D K-tota and UV. This criterion arises from the assumption that the structure of the system only in an exceptional case will change adequately to random breakdown to ground. Other slokak

    You, the change in the degree of asymmetry as a result of a breakdown on the volume does not lead to a simultaneous change in the degree of mismatch. This change in the degree of asymmetry is not field i-readable in an NX analyzer to obtain criteria that ensures detection of the degree of leakage through high resistance.
    The circular diagram., F (V) is proven in FIG. 1, build from sin points: a given point, the curve of which is tangential to the neutral point N of the three-phase system, and two other external measuring points. The position of these two points is leached using an NX analyzer by using a programmed zero total conductivity Q. in principle, these changes can be obtained in various ways, including, which is n (shown on LSh. 7 by connecting capacitive IOMIMIT.I C to the neutral. It gives the values of n two measurement points — EW (t) and -FN (2)). a circle of opoi; niaipaMMi4 fi 1.
    The values of i reactive compounds of the aperture COL and ((01 + 1 / b) C) are 1 H1.1. The holographic mismatch is obtained by projecting the measured values on op i 01 on the opal scale, on which the resonance point (V 0) is also shown, as shown in FIG. 1. The scale is linear and is determined by two and local measured values. Derivative ratio 05 In EW, the shape of the pie chart is determined depending on the load.
    In general, the neutral voltage is defined as follows.
    UEN YR + + a Ut / p YR + Y5 + YT + Y0;
    Imgde v
    Bc + B5 + W- -B (
    BR + BS + W
    G.z + a5 + GT + G0 (3)
    BR + B5 + W i
    K - YR + aY-r (} BR + Bs + W; And;
    what gives
    TO
    and,
    -EH v + d and at the point of resonance, where V Oh,
    (6)
    d and K values are determined by the following
    (6) give the ratio
    THAN
    R
    Fn
     (V dV x A X
    (7)
    with two solutions for V
    V,
    , 1 O, + ((X - 1)
    1a, b)
    From the curve in FIG. 1 followed by two points V4a, b), for which X 2 ° 5. The final calculation of the two values in the “two points” gives



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     - Shend, onse
    In more detail, the NX-analyzer is described n fng.Z. The symbols in the framework refer to the steps of the execution of action 001 ... 030.
    Operation begins (steps 001-013) by determining the limit values A-i :. Cells F and G are used to store the reactive values of neutrin neutrin GJI and CCO L + 1 / i) C), respectively. After storing the voltage at the neutral point Uv and the reference voltage, the initial value of the relative voltage at the neutral point UEN (() 05) is calculated, the amplitude and phase components of which are stored in cell I (006). Then, the reaction composition was entered with C (007). The calculated value is then stored in the K cell (008 ... 010). Using the information stored in the I and K cells and the corresponding reactivity values stored in the F and O cells, the NX analyzer calculates the pie chart f (V) and the initial values of V, d and K, which are then stored in the cells L, Mi N, respectively (OP, 012). The original sequence of calculations is then completed by a transition in cell T, OOP 1 (013).
    The operation of the LOOP 1 cell begins with calculating a new initial value JJfjn, which is then entered
    cell 1 (015 ... 018). The initial value is continuously compared with the current values of the current UEN in cell I (019 .. .022). If the limit value of this value is exceeded, the work program moves to the LOOP 2 (023) cell. For operation in the mode of regular calculations of the system parameters, the LOOP 1 cell can, in principle, be supplemented with a cycle counter or a time control device.
    The LOOP 2 cell is connected to the reactivity calculation cell (025). Further, UJN (026 ... 028) are calculated, followed by V, d and K (029). The values of V and K are temporarily stored by the O and P cells (030). In the event that any value exceeds the predetermined values, an alarm occurs (103 ... 037). The control of the relative asymmetry j is carried out within two limited limits. Provided that the degree of detuning does not change (033), the comparison is made with the limit value K c, which, in principle, can be set more rigidly compared to K. The LOOP 2 cell provides the transfer of V and K values (038) back in cell 1 (039).
    权利要求:
    Claims (3)
    [1]
    1. The method of controlling the mismatch parameter (V) in transmission systems
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    power without direct grounding, which means that they measure the voltage on the neutral lines, measure the phase voltage of the network and use it as a reference voltage, relative to which the relative change of voltage on the neutral voltage U in amplitude is determined and phase, characterized in that, in order to expand the functionality of / t, the attenuation parameters d and the asymmetry K are additionally monitored, for which, at regular intervals or depending on the change of the relative voltage on the neutral point Additional reactive overlap between the neutral system and the ground is yued, after which the relative voltage change on the neutral voltage (CELP) is again determined using the value and after connecting the reactive components, the UEM () pie chart is calculated. mismatch V, K asymmetry and attenuation d.
    [2]
    2. The method according to claim 1, about tl and h and y - 0 w and with the fact that they constantly remember the result of the previous calculations of the mismatch control parameters V, K asymmetry and attenuation d, each subsequent value of these parameters is compared with their previous value and calculate the relative change of these parameters delta V, delta K and delta d.
    i
    [3]
    3. The method of PP.1 and 2 differs from the fact that they control the parameters of delta K and delta V and with a constant mismatch parameter delta V and a change in the parameter delta K fix accidental leaks of the power transmission system line to earth.
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    同族专利:
    公开号 | 公开日
    JPS62500907A|1987-04-09|
    AU5093785A|1986-06-18|
    WO1986003350A1|1986-06-05|
    US4729052A|1988-03-01|
    FI88834B|1993-03-31|
    EP0235145B1|1991-02-27|
    AU583868B2|1989-05-11|
    FI872188A0|1987-05-18|
    EP0235145A1|1987-09-09|
    SE8405806D0|1984-11-19|
    SE450675B|1987-07-13|
    DE3581944D1|1991-04-04|
    FI88834C|1993-07-12|
    SE8405806L|1986-05-20|
    BR8507285A|1987-11-03|
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    AT294230B|1969-04-18|1971-11-10|Elin Union Ag|Arrangement for monitoring the resonance tuning in networks protected by earth fault extinguishing coils|
    DE2358197C3|1973-11-22|1979-07-05|Robert 7995 Neukirch Buck|Procedure for the automatic setting of earth fault coils |
    US3992661A|1975-08-25|1976-11-16|General Electric Company|Reactive current compensating apparatus for electric power systems|
    DE2911169A1|1979-03-22|1980-10-02|Licentia Gmbh|Multiple network earth compensating system - has earthing coils connected by voltage monitoring circuits and selector to central control unit|
    DE3067249D1|1979-09-27|1984-05-03|Siemens Ag|Device for controlling the voltage between two conductors of an a.c. supply mains for a rapidly changing load|
    CH659157A5|1982-11-02|1986-12-31|Bbc Brown Boveri & Cie|CIRCUIT FOR COMPENSATING BLIND POWER IN AN ELECTRICAL AC VOLTAGE NETWORK.|
    CA1193351A|1983-06-14|1985-09-10|Gerald Roberge|Method and system for interconnecting three-phasesynchronous or asynchronous circuits throughvariable reactive impedances|IE921252A1|1991-04-19|1992-10-21|Elektro Bau Ag|A method for determining an earth-shorted branch circuit in¹an electrical supply or distributor network|
    GB9125280D0|1991-11-28|1992-01-29|Smiths Industries Plc|Patient support tables and monitors|
    FR2697341B1|1992-10-26|1995-01-13|Electricite De France|Method and device for measuring the agreement and the disagreement of compensation of an electrical distribution network.|
    AT402770B|1995-04-25|1997-08-25|Haefely Trench Austria Gmbh|METHOD FOR MONITORING A THREE-PHASE NETWORK FOR A CHANGE IN THE TUNING COOLER|
    DE19525417C2|1995-07-12|2000-03-23|Starkstrom Geraetebau Gmbh|Arrangement for earth leakage current compensation of a multi-phase electrical network|
    FI100922B|1996-11-04|1998-03-13|Abb Transmit Oy|Method for detecting and locating a grounding fault with great resistance in an electricity distribution network|
    FI108894B|2000-09-22|2002-04-15|Abb Substation Automation Oy|A method for detecting a faulty or faulty output or branch of a power grid, for example in a compensated network|
    DE10146294C1|2001-09-19|2003-07-17|Edc Gmbh|Network compensation determination method for tuning Petersen coil uses equations obtained from measured phase voltages and line currents for calculation of capacitive zero current|
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    法律状态:
    优先权:
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    SE8405806A|SE450675B|1984-11-19|1984-11-19|DEVICE FOR MONITORING OF THE NETWORK PARAMETERS DIMENSION, OSYMMETRIGRADE AND SCREW RECONCILIATION IN IMPEDANCED POWER NETWORK|
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