86results about How to "Does not affect correct action" patented technology

The invention discloses a phase-splitting difference stream method for preventing voltage transformer differential protection unwanted operation by utilizing fault components, wherein the three-phase difference current variation in the transformer differential protection constitute ratio braking element with the zero-sequence current variation, when the ratio of the differential current variation and the zero-sequence current variation is smaller than a setting value K, the corresponding differential current is judged to be the error current caused by the faults outside the area, and outputs corresponding brake signal, brake the corresponding phase ratio differential protection, thus preventing the differential protection accidental operation of the transformer, The advantage of the invention is, the transformer differential protection false operation resulted from neutral ground lateral area outer earth fault can be fully prevented, without influencing the correct actuation of the differential protection under the circumstance of in-area faults.

This invention discloses a longitudinal deviation protection method for a transformer with the largest side zero sequence rate brake, which weights a brake current representing through current in the longitudinal difference protection and the maximum value in the zero sequence current of the earth side of the neutral points in the transformer and sums to get a brake current with zero sequence current, which is used to get the phase rate brake element with the differential current of a related phase, when the differential current is greater than the brake current with the zero sequence current and the smallest action current, the action signal of the rate brake element of said phase is output.

The invention relates to a circular plate bimetallic type steam drain valve featuring large drainage capacity. The valve is characterized in that an inner cavity of a valve body (11) is provided with a filtering net (12), the centers of a water inlet hole (24) and an a water outlet hole (25) respectively at the left side and right side of the valve body (11) is on the same axis, screw holes (26) are evenly distributed at the bottom part of the inner cavity of the valve body (11) to communicate with the water outlet hole (25). Positioning pins (4) are symmetrically arranged at the upper part of the valve body (11) to position with a valve cover (2), a screw bolt (17) is used to tighten the positioning pins (4) and the valve cover (2); the valve cover (2) is connected with a valve bonnet (21) by a screw thread. A small head end of a valve seat (8) is connected with the screw holes, the outer diameter of the valve seat (8) is sheathed with a spring (7), the inner cavity is provided with a support (6), the support (6) is internally provided with a core sleeve (5), the core sleeve (5) is internally provided with a core shaft (3), the core shaft (3) is provided with a bimetallic strip group (14) which is positioned by an E-shaped clamp spring (13), an adjusting bolt (20) is connected with the valve cover (2) in thread. The steam drain valve of the invention features high operation reliability, contribution to recovery of condensed water, elimination of air blocking and steam locking, agile and reliable movement, low noise, long service life, convenient horizontal installation and easy maintenance.

This invention discloses a longitudinal deviation protection element of a fault component transformer with multiple side zero sequence rate brakes, in which, the brake current fault components of three phases representing the through current in the present transformer differential protection is weighted with the weighted values of zero sequence currents of neutral point earth sides to get the fault components of the brake currents with zero sequence currents of the three phases to be used to make up of rate differential elements of related phases with the differential current components, when that of the differential current is greater than that of the brake current containing zero sequence current, a rate differential action signal of related phase is output.

The invention discloses a phase-splitting integrated brake device for preventing multiple-branch voltage transformer differential protection unwanted operation, wherein the three-phase difference currents in the transformer differential protection constitute ratio braking element with the maximum value of zero-sequence current on each of the neutral point earthing end (or branches), when the positive input end signal is less than the negative input end signal on the comparator 51-53, the comparator outputs 0, the corresponding differential current is judged to be the error current caused by the faults outside the area, and outputs corresponding brake signal, brake the corresponding phase ratio differential protection, thus preventing the differential protection accidental operation of the transformer, otherwise the comparator outputs 1, and the corresponding differential protection actuations are allowed. The advantage of the invention is, the transformer differential protection false operation resulted from neutral ground lateral area outer earth fault can be fully prevented, without influencing the in-area breakdown, the correct actuation of differential protection can be guaranteed.

The invention discloses an integrated differential flow method for preventing voltage transformer differential protection unwanted operation, wherein the base wave positive sequence current or negative sequence current of the three-phase difference currents in the transformer differential protection constitute ratio braking element with the zero-sequence current on the Y0 side, when the ratio of the base wave positive sequence current or base wave negative sequence current and zero-sequence current is less than a setting integer K, the Y0 lateral area outer ground fault is determined, The advantage of the invention is, the transformer differential protection false operation resulted from neutral ground lateral area outer earth fault can be fully prevented.

The invention discloses a phase-splitting brake device for preventing voltage transformer differential protection unwanted operation by utilizing fault components, wherein the three-phase difference current variation in the transformer differential protection constitute ratio braking element with the zero-sequence current variation, when the ratio of the differential current variation and the zero-sequence current variation is smaller than a setting value K, the comparator outputs 0, the corresponding differential current is judged to be the error current caused by the faults outside the area, and outputs corresponding brake signal, brakes the corresponding phase ratio differential protection, thus preventing the differential protection accidental operation of the transformer. otherwise the comparator outputs 1, and the corresponding differential protection actuations are allowed. The advantage of the invention is, the transformer differential protection accidental operation resulted from ground fault outside the Y0 lateral area when the errors of the three-phase current transformer are in inconformity, and without influencing the correct actuation of the differential protection under the circumstance of in-area faults.

The invention discloses a phase sequence synthesizing method for preventing multiple-branch voltage transformer differential protection unwanted operation, wherein the three-phase difference currents in the transformer differential protection constitute ratio braking element with the maximum value of zero-sequence current on each of the neutral point earthing end (or branches), when the ratio value is less than a setting value K, the Y0 lateral area outer ground fault is determined, and outputs corresponding brake signal, brake the corresponding phase ratio differential protection, The advantages of the invention are, the transformer differential protection accidental operation resulted from ground fault outside the lateral area when the errors of the three-phase current transformer are in inconformity.

The invention provides an AC filter differential protection method based on a high-voltage side current effective value. The method comprises the following steps that step one, high-voltage side current and low-voltage side current of an AC filter are sampled; step two, 50HZ filtering is performed on the sampled high-voltage side current and low-voltage side current, differential current of high-voltage side and low-voltage side current is calculated by adopting a 50HZ component and is compared with a differential current fixed value; step three, a high-voltage side current effective value is calculated and compared with an effective value fixed value; and step four, when differential current of high-voltage side and low-voltage side current is greater than the differential current fixed value and the high-voltage side current effective value is greater than the effective value fixed value, actuation of differential protection is outputted without time delay, a high-voltage side switch is tripped off, and differential protection does not actuate under other conditions. Distinguishing is performed by adopting different characteristics of high-voltage side current when the AC filter withdraws and fails to work so that reliable actuation protection in a local grounding fault can be guaranteed and no actuation in the withdrawing process of the AC filter can be reliably guaranteed.

This invention discloses a longitudinal deviation protection method for a fault component transformer with the largest side zero sequence rate brake, which weights the fault component of the brake current representing the through current and the maximum value in the fault components of the zero sequence currents of the neutral point earth sides of the transformer to get the fault component of the brake current containing zero sequence current, the fault component of which and that of the differential current of a related phase are used to make up of a fault component rate brake element of said phase, when the component of the differential current is greater than that of the brake current containing zero sequence current and greater than the minimum action current, a signal of the fault component rate brake element of said phase is output.

The invention discloses an integrated difference stream brake device for preventing voltage transformer differential protection unwanted operation by utilizing fault components, wherein the base wave positive sequence current or negative sequence current of the three-phase difference currents in the transformer differential protection constitute ratio braking element with the zero-sequence current on the Y0 side, when the ratio of the differential current variation and the zero-sequence current variation is smaller than a setting value K, the comparator outputs 0, the Y0 lateral area outer ground fault is determined, the three-phase differential protection exit is locked, otherwise the comparator 7 outputs 1, and the corresponding differential protection actuations are allowed. The advantages of the invention are, the transformer differential protection accidental operation resulted from ground fault outside the Y0 lateral area when the errors of the three-phase current transformer are in inconformity, and without influencing the correct actuation of the differential protection under the circumstance of in-area faults.

The invention discloses a negative sequence differential flow integrated brake device for preventing multiple-branch voltage transformer differential protection unwanted operation, wherein the three-phase difference currents in the transformer differential protection constitute ratio braking element with the maximum value of zero-sequence current on each of the neutral point earthing end (or branches), when the ratio value is less than a setting value K, the comparator outputs 0, the lateral area outer ground fault is determined, the three-phase differential protection exit is locked, otherwise the comparator 6 outputs 1, and the corresponding differential protection actuations are allowed. The advantages of the invention are, the transformer differential protection accidental operation resulted from ground fault outside the lateral area when the errors of the three-phase current transformer are in inconformity.

The invention discloses a negative sequence synthesized integrated brake device for preventing multiple-branch voltage transformer differential protection unwanted operation by utilizing fault components, wherein the three-phase difference currents in the transformer differential protection constitute ratio braking element with the maximum value of zero-sequence current on each of the neutral point earthing end (or branches), when the positive input end signal is less than the negative input end signal on the comparators, the comparator outputs 0, the lateral area outer ground fault is determined, the three-phase differential protection exit is locked, otherwise the comparator 9 outputs 1, and the corresponding differential protection actuations are allowed. The advantage of the invention is, the transformer differential protection accidental operation resulted from ground fault outside the lateral area when the errors of the three-phase current transformer are in inconformity without influencing the correct actuation of the differential protection under the circumstance of in-area faults.

The invention discloses a negative sequence synthesized brake device for preventing multiple-branch voltage transformer differential protection unwanted operation by utilizing fault components, wherein the three-phase difference currents in the transformer differential protection constitute ratio braking element with the maximum value of zero-sequence current on each of the neutral point earthing end (or branches), when the positive input end signal is less than the negative input end signal on the comparators, the comparator outputs 0, the lateral area outer ground fault is determined, the three-phase differential protection exit is locked, otherwise the comparator 8 outputs 1, and the corresponding differential protection actuations are allowed. the transformer differential protection accidental operation resulted from ground fault outside the lateral area when the errors of the three-phase current transformer are in inconformity.

The invention discloses a phase-splitting difference stream method for preventing multiple-branch voltage transformer differential protection unwanted operation by utilizing fault components, wherein the three-phase difference currents in the transformer differential protection constitute ratio braking element with the maximum value of zero-sequence current on each of the neutral point earthing end (or branches), when the ratio value is less than a setting value K, the corresponding differential current is judged to be the error current caused by the faults outside the area, brake the corresponding phase ratio differential protection, thus preventing the differential protection accidental operation of the transformer. The advantage of the invention is, the transformer differential protection accidental operation resulted from ground fault outside the lateral area when the errors of the three-phase current transformer are in inconformity.

The invention discloses a positive sequence synthesized brake device for preventing multiple-branch voltage transformer differential protection unwanted operation, wherein the three-phase difference currents in the transformer differential protection constitute ratio braking element with the maximum value of zero-sequence current on each of the neutral point earthing end (or branches), when the positive input end signal is less than the negative input end signal on the comparators, the comparator outputs 0, the lateral area outer ground fault is determined, the three-phase differential protection exit is locked, otherwise the comparator 5 outputs 1, and the corresponding differential protection actuations are allowed. The advantages of the invention are, the transformer differential protection accidental operation resulted from ground fault outside the lateral area when the errors of the three-phase current transformer are in inconformity.

The invention discloses a three-phase brake device for preventing multiple-branch voltage transformer differential protection unwanted operation by utilizing fault components, wherein the three-phase difference currents in the transformer differential protection constitute ratio braking element with the maximum value of zero-sequence current on each of the neutral point earthing end (or branches), when the ratio value is less than a setting value K, the comparator outputs 0, the corresponding differential current is judged to be the error current caused by the faults outside the area, the signal is outputted through an OR gate 9, or when the OR gate 9 outputs 0, the three-phase differential protection exit is locked, otherwise the OR gate 9 outputs 1, and the corresponding differential protection actuations are allowed. The advantage of the invention is, the transformer differential protection accidental operation resulted from ground fault outside the lateral area when the errors of the three-phase current transformer are in inconformity without influencing the correct actuation of the differential protection under the circumstance of in-area faults.

The invention discloses a phase-splitting integrated zero-sequence brake method for preventing multiple-branch voltage transformer differential protection unwanted operation, wherein the three-phase difference currents in the transformer differential protection constitute ratio braking element with the maximum value of zero-sequence current on each of the neutral point earthing end (or branches), when the ratio value is less than a setting value K, the corresponding differential current is judged to be the error current caused by the faults outside the area, brake the corresponding phase ratio differential protection, thus preventing the differential protection accidental operation of the transformer. The advantage of the invention is, the transformer differential protection accidental operation resulted from ground fault outside the lateral area when the errors of the three-phase current transformer are in inconformity.

The invention discloses a positive sequence synthesized integrated brake device for preventing multiple-branch voltage transformer differential protection unwanted operation by utilizing fault components, wherein the three-phase difference currents in the transformer differential protection constitute ratio braking element with the maximum value of zero-sequence current on each of the neutral point earthing end (or branches), when the positive input end signal is less than the negative input end signal on the comparators, the comparator outputs 0, the lateral area outer ground fault is determined, the three-phase differential protection exit is locked, otherwise the comparator 9 outputs 1, and the corresponding differential protection actuations are allowed. The advantage of the invention is, the transformer differential protection accidental operation resulted from ground fault outside the lateral area when the errors of the three-phase current transformer are in inconformity without influencing the correct actuation of the differential protection under the circumstance of in-area faults.

The invention discloses a phase-splitting brake device for preventing multiple-branch voltage transformer differential protection unwanted operation, wherein the three-phase difference currents in the transformer differential protection constitute ratio braking element with the maximum value of zero-sequence current on each of the neutral point earthing end (or branches), the ratio value is utilized to determine the ground fault outside the lateral area, when the ratio value is less than a setting value K, the comparator outputs 0, the corresponding differential current is judged to be the error current caused by the faults outside the area, and outputs corresponding brake signal, brake the corresponding phase ratio differential protection, thus preventing the differential protection accidental operation of the transformer, otherwise the comparator outputs 1, and the corresponding differential protection actuations are allowed. The advantage of the invention is, the transformer differential protection false operation resulted from neutral ground lateral area outer earth fault can be fully prevented without influencing the in-area breakdown, the correct actuation of differential protection can be guaranteed.

The invention discloses a three-phase brake device for preventing multiple-branch voltage transformer differential protection unwanted operation, wherein the three-phase difference currents in the transformer differential protection constitute ratio braking element with the maximum value of zero-sequence current on each of the neutral point earthing end (or branches), when the ratio value is less than a setting value K, the corresponding differential current is judged to be the error current caused by the faults outside the area, the comparator outputs 0, the signal is outputted through an OR gate 5, or when the OR gate 5 outputs 0, the three-phase differential protection exit is locked, or when the OR gate 5 outputs 1, and the corresponding differential protection actuations are allowed. The advantage of the invention is, the transformer differential protection accidental operation resulted from ground fault outside the lateral area when the errors of the three-phase current transformer are in inconformity, and without influencing the correct actuation of the differential protection under the circumstance of in-area faults.

This invention discloses a longitudinal deviation protection element for a transformer with the largest side zero-sequence rate brake, which carries out weight and sum of three phase brake currents representing the through current in the differential protection of the present transformers with the maximum value in the zero sequence current of the earth side of each neutral point to get brake currents of three phases containing the zero sequence current to be used to get rate brake elements of related phases with the three phase differential currents, when the differential current is greater than the brake current containing the zero sequence current, a rate differential action signal of a related phase is output.