RU97105668A - METHOD FOR DIAGNOSTIC OF ELECTRICAL SWITCHING MACHINE (ITS OPTIONS) - Google Patents

Claims (3)

1. A method for diagnosing an electrical switching apparatus based on measuring at least one phase the moving contact speed of at least one coordinate X _{i of} its trajectory when the diagnosed apparatus is turned on (off), comparing the measurement results with acceptable values and deciding on the state apparatus, characterized in that for the apparatus, taken as a reference, determines at least one phase value of the electrical capacitance C _et.otkl phase contacts between the machine is disabled uninstalled condition selected coordinate X ^* scaling reference capacitance dependencies and diagnosed units equal to the coordinate of the movable contact device at its location in the vicinity of the fixed contact, determines the capacitance C _et.i at that coordinate, determined in the coordinate X _i and capacitance C _et.i forming a first informative parameter that characterizes a change in capacitance between C _et contacts phase in the vicinity of the coordinates X _i, in the form of the first derivative of the capacitance of the coordinate, and when the (disconnected) d agnostiruemogo apparatus during its movement the movable contact measured value of the capacitance C _d of phase contacts between the apparatus and stored in the form of capacitance C _d of time, determine time scale T ^* and the reference capacitance dependences diagnosed when disconnecting devices of the latter, for example by the formula
T ^* = T _n • X ^* / X _makc ,
and when it is turned on - according to the formula
T ^* = T _n • (1-X ^* / X _makc ),
where X _makc is the maximum distance between the phase contacts of the reference apparatus;
T _p - travel time of the movable contact of the phase of the diagnosed apparatus in the open state;
determined by the dependence of the capacitance C _d on time, its value C ^* _d at time T ^* , determine the value of the capacitance C _{di of the} diagnosed apparatus at time T _i , corresponding to the passage of the contact point with the coordinate X _i by the formula

where C _d.off - the capacitance between the phase contacts of the diagnosed apparatus in the off state, according to the dependence of the capacitance C _d on time, form a second informative parameter characterizing the change in capacitance C _d in time in the vicinity of its value C _d.i , in the form of the first derivative of this capacitance in time, and the speed of the moving contact in the coordinate X _i is judged by the ratio of the second informative parameter to the first. 2. A method for diagnosing an electrical switching apparatus based on measuring at least one phase the moving contact speed of at least one coordinate X _{i of} its trajectory when the diagnosed apparatus is turned on (off), comparing the measurement results with acceptable values and deciding on the state apparatus, characterized in that for the apparatus, taken as a reference, determines at least one phase value of the electrical capacitance C _et.otkl phase contacts between the machine is disabled uninstalled condition selected coordinate X ^* scaling capacitance dependencies of the reference and diagnosed units equal the movable contact coordinate device at its location in the vicinity of the fixed contact, define C ^* _fl capacitance at that coordinate, are selected in the vicinity of the coordinates X _i coordinate pair X ₁ and X _2, determine the values of C and C _{fl.1 et.2} capacity in these coordinates and is formed as the difference of coordinate values of X ₁ and X _2, the first information parameter characterizing the change in capacitance between C _fl contact E phase in the vicinity of the coordinates X _i, and switched (turned off) the diagnosed apparatus during its movement the movable contact _d C measured capacitance values between the phase contacts define time scale T ^* and the reference capacitance dependencies of the diagnosed apparatus when disconnected last from the formula
T ^* = X ^* • T _p / X _max ,
and when it is turned on - according to the formula
T ^* = T _m • (1-X ^* / X _max ),
where X _max is the maximum distance between the phase contacts of the reference apparatus;
T _p - time of movement of the movable contact of the phase of the diagnosed apparatus in the open state,
determined by the dependence of the capacitance C _d on time its value C $\genfrac{}{}{0ex}{}{\text{*}}{\text{d}}$ at time T ^* , determine the values of the capacitance C _d1 and C _{d2 of the} diagnosed apparatus at time instants T ₁ and T ₂ corresponding to the passage of contact points with coordinates X ₁ and X ₂ according to the formula

where C _d.off - the capacitance between the phase contacts of the diagnosed apparatus in the off state;
k = 1 and 2 for time points T ₁ and T ₂ ,
according to the dependence of the capacitance C _d on time, a second informative parameter is formed characterizing the change in capacitance C _d in time in the vicinity of its value C _d.i , in the form of a time interval corresponding to the change in capacitance C _d between the values C _d1 and C _d2 , and the speed of movement mobile contact in the coordinate X _i judged by the ratio of the first informative parameter to the second. 3. The diagnostic method according to claim 1 or 2, characterized in that on the basis of the dependence of the capacitance C _d on time, the time T _{p of} moving the movable contact in the open state of the apparatus is determined as the duration of the time interval in which the first derivative of the capacitance C _d is not equal in time to zero.