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    • 2. 发明专利
    • Power system protective device
    • 电力系统保护装置
    • JP2009033967A
    • 2009-02-12
    • JP2008276933
    • 2008-10-28
    • Tokyo Electric Power Co Inc:TheToshiba Corp東京電力株式会社株式会社東芝
    • YANAGIBASHI TAKESHISUZUKI MAMORUMAEDA TAKAFUMIISHIBASHI SATORUNISHITANI YASUNORI
    • H02J3/14H02J3/00H02J3/18
    • H02J3/18Y02E40/30Y10T307/461
    • PROBLEM TO BE SOLVED: To detect a decrease in voltage caused by reactive power characteristics with high sensitivity and no incorrect decision even if the system busbar is an electric power system connected by network electric feeder line while protective operation is actualized adequately.
      SOLUTION: A master device, which acquires system electrical quantity of one or more high-order substations, detects a voltage drop resulting from the reactive power characteristics of the electric power system and transmits a detection signal of voltage decrease to a terminal device, which acquires the system electrical quantity of one or more low-order substations. Based on a load voltage and a load current of the load busbar, each terminal device disconnects sequentially a load in order of magnitude of voltage-drop influence resulting from the reactive power characteristics, and thereby the voltage drop caused by reactive power characteristics in power system can be prevented.
      COPYRIGHT: (C)2009,JPO&INPIT
    • 要解决的问题:即使系统母线是通过网络供电线路连接的电力系统,在保护操作充分实现的情况下,也可以高灵敏度地检测由无功功率特性引起的电压降低,并且不准确地决定。 解决方案:获取一个或多个高次变电站的系统电量的主设备检测由电力系统的无功功率特性引起的电压降,并将电压降低的检测信号发送到终端设备 ,其获取一个或多个低阶变电站的系统电量。 根据负载母线的负载电压和负载电流,每个终端设备按照无功功率特性导致的压降影响的大小顺序依次断开负载,从而导致电力系统无功功率特性引起的电压降 可以防止。 版权所有(C)2009,JPO&INPIT
    • 7. 发明专利
    • SYSTEM PROTECTIVE UNIT
    • JPH04109818A
    • 1992-04-10
    • JP22522890
    • 1990-08-29
    • TOKYO ELECTRIC POWER COTOSHIBA CORP
    • SUZUKI MAMORUMAEDA TAKAFUMIKOMATA KAZUYAKAMIMURA YOICHISATO MASAHIROKOYANAGI KAORUTSUKUI RYOICHI
    • H02H3/48
    • PURPOSE:To obtain a system protective unit for supplying power stably at the time of peak demand in Summer by providing a load with an interruption command when conditions that the variation amount and variation ratio of the admittance of system load are higher than or equal to predetermined values and conditions that the system voltage is lower than a predetermined level sustain for a predetermined time. CONSTITUTION:A high bus voltage V1 is introduced through a transformer 14 while current ITr of a transformer 11 is introduced through a current transformer 13 and then effective and reactive powers of a system load are operated based on thus introduced high bus voltage and transformer current thus determining the admittance of the system load required for judgment. On the other hand, a low bus voltage V2 is introduced through a transformer 16 and currents I1, I2..., In of respective load transmission lines 11 are introduced in order to operate the power factor of load connected with each transmission line. When the voltage conditions and the admittance conditions of the system load satisfy the operating conditions of a system protective unit 8, an interruption command is provided to a particular transmission line. According to the constitution, power can be supplied through optimal interruption of load resulting in a highly reliable system protection.
    • 10. 发明专利
    • STEADY STATE STABILITY MONITORING METHOD
    • JPH048127A
    • 1992-01-13
    • JP11086890
    • 1990-04-26
    • TOKYO ELECTRIC POWER COTOSHIBA CORP
    • SUZUKI MAMORUSEDEI TADASHISATO MASAHIROAOYANAGI MARI
    • H02J3/24
    • PURPOSE:To judge a steady state stability with a high accuracy by a method wherein, in order to contract the exact model of a generator and produce a simplified model, the braking factors of the generator are so adjusted as to have attenuation constants and periods of both the models agree with each other. CONSTITUTION:An adjusted quantity calculating means S10 calculates the adjusted components D1, D2- Dm by adjusting breaking factors. A factor matrix A producing means S20 produces the factor matrix A and a characteristic value calculation and stability judging means S30 obtains the factor matrix A. The output values, phase angles, etc., of a generator which are measured by a measurement means S40 from a power system (P) at the time of operation are transmitted through a transmission means S50 as the elements of the characteristic values sigma+jomega and the factor matrix A is produced by the central judging and processing part. The characteristic value sigma+jomega is calculated from the factor matrix A and, if sigma of the characteristic value is negative, the state is judged to be stable and, if sigma is positive, the state is judged to be unstable. With this constitution, the degree of the factor matrix of a simplified model is degraded, so that the matrix can be solved with a high speed.