专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

91. 发明申请

US20050201033A1 Apparatus for monitoring open state of the secondary terminals of a current transformer 有权
标题翻译：用于监测电流互感器的次级端子的开路状态的装置
公开(公告)号：US20050201033A1
公开(公告)日：2005-09-15
申请号：US11076562
申请日：2005-03-09
申请人： Ki-Chan Song
发明人： Ki-Chan Song
IPC分类号： H02H7/125
CPC分类号： H02H7/04
摘要： Disclosed herein is an apparatus for connection to the secondary terminals of a CT to prevent CT damage and electric shock when the secondary terminals are opened, by providing an input signal and operating a relay circuit to short the CT secondary terminals. The apparatus monitors opening of the CT secondary terminals, and to prevent accidental opening, determines opening and provides an over voltage breaking upon opening. To prevent false operation of the protecting relay connected to the secondary terminals caused by the over voltage generated by accident other than opening of the CT secondary terminals, a secondary delay time of operation of the protecting relay is provided that can be variously set by DIP switch or otherwise, allowing the user to choose a desired setting. Further, expected over voltage values can be set according to load characteristics, allowing the apparatus to operate during voltage above the set value.
摘要翻译：这里公开了一种用于连接到CT的二次端子的装置，用于通过提供输入信号并操作中继电路来使CT二次端子短路，以防止二次端子打开时的CT损坏和电击。该装置监视CT二次端子的开度，并且防止意外打开，确定打开并在打开时提供过电压断开。为了防止连接到二次端子的保护继电器由于CT二次端子开启以外的过电压而产生的过电压的误操作，提供了保护继电器的辅助延迟时间，可以通过DIP开关进行各种设置或以其他方式允许用户选择期望的设置。此外，可以根据负载特性来设定预期的过电压值，允许装置在高于设定值的电压期间运行。

92. 发明授权

US06839207B2 Protection system for protecting a poly-phase distribution transformer insulated in a liquid dielectric, the system including at least one phase disconnector switch 失效
标题翻译：用于保护在液体电介质中绝缘的多相配电变压器的保护系统，该系统包括至少一个隔离开关
公开(公告)号：US06839207B2
公开(公告)日：2005-01-04
申请号：US10274406
申请日：2002-10-21
申请人： Philippe Folliot , Stéphane Melquiond , François Hebert , Patrice Grave
发明人： Philippe Folliot , Stéphane Melquiond , François Hebert , Patrice Grave
IPC分类号： H01H9/10 , H01H79/00 , H02H7/04
CPC分类号： H01H79/00 , H01F27/402 , H01H9/104 , H02H7/04
摘要： The distribution transformer is installed in a station having N phases, at least N-1 phases being equipped on the high-voltage side of the transformer with respective current-limiting fuses capable of blowing in the event of a dead short circuit between the phases. The protection system includes: at least one fault detector for detecting faults on the basis of at least one of the following indicators: pressure in the tank, level of the dielectric, or temperature of the transformer; a short-circuiter acting on all the phases situated upstream from the high-voltage windings, said short-circuiter being capable of being triggered by said fault detector to establish a dead short circuit between the phases; and on at least N-1 phases, a detector for detecting an abnormal current upstream from the transformer, said detector being associated with a controller for controlling said short-circuiter. In the system, at least the phase that is not equipped with a limiting fuse is equipped with a disconnector switch which is normally closed in the absence of any fault, said disconnector switch being disposed on the high-voltage side of the transformer upstream from the short-circuiter, and opening thereof being triggered by the short-circuiter in the event of a fault, but with a certain delay.

93. 发明授权

US06424266B1 Apparatus for preventing thermal damage to an electrical power transformer 失效
标题翻译：用于防止对电力变压器的热损伤的装置
公开(公告)号：US06424266B1
公开(公告)日：2002-07-23
申请号：US09617761
申请日：2000-07-17
申请人： Mark Anthony Weekes , Robert George Coish , Zhiying Zhang , Glenn William Swift
发明人： Mark Anthony Weekes , Robert George Coish , Zhiying Zhang , Glenn William Swift
IPC分类号： G08B1700
CPC分类号： H02H6/005 , H02H5/06 , H02H7/04
摘要： An apparatus for monitoring and controlling the operation of an electrical power transformer includes a processor with input transducers for providing to the processor inputs indicative of electrical current in a winding of the transformer and ambient temperature outside the transformer. The processor is arranged using an algorithm based upon heat transfer to repeatedly calculate a first prediction, based upon the present values of electrical current and ambient temperature, of a time period before the hot spot temperature exceeds a pre-set allowable maximum and a second prediction, based upon the current value of power, of a time period before the accumulated loss of life exceeds a pre-set allowable maximum. If the shorter time period of the two calculations is less than a pre-set value, for example one half hour, the processor generates an alarm signal and a display counting down the time remaining in the period, together with a second alarm signal at a shorter second time of for example one quarter hour.
摘要翻译：用于监测和控制电力变压器的操作的装置包括具有输入换能器的处理器，用于向处理器提供指示变压器的绕组中的电流和变压器外部的环境温度的输入。处理器使用基于热传递的算法来布置，以基于热点温度超过预设允许最大值和第二预测之前的时间段的电流和环境温度的当前值重复计算第一预测基于当前的功率值，在累积的寿命损失超过预定的允许最大值之前的时间段内。如果两次计算的较短时间段小于预定值（例如一个半小时），则处理器产生一个报警信号和一个在该周期内剩余时间的下降的显示以及第二个报警信号较短的第二次例如四分之一小时。

94. 发明授权

US5949633A Fluorescent lamp drive system with transformer over-voltage protection circuit 失效
标题翻译：荧光灯驱动系统带变压器过电压保护电路
公开(公告)号：US5949633A
公开(公告)日：1999-09-07
申请号：US962157
申请日：1997-10-31
申请人： David W. Conway
发明人： David W. Conway
IPC分类号： H02H3/12 , H02H7/04 , H05B41/298 , H05B41/392
CPC分类号： H05B41/2985 , H02H7/04 , H05B41/3922 , H05B41/3927 , H02H3/12
摘要： A transformer over-voltage protection circuit shuts down a resonant inverter when high voltages occur at the output of a transformer. The high voltages can be caused by a broken or removed display tube. The system is designed to be used in display system, such as, an active matrix liquid crystal display (AMLCD). The system senses the voltage at the output of the transformer by utilizing a tickler or a tertiary winding. The signal from the tertiary winding is rectified and compared to a threshold. If the signal from the tertiary winding is greater than the threshold, the inverter is shut down for a period of time.
摘要翻译：变压器过压保护电路在变压器输出端发生高电压时关闭谐振逆变器。高电压可能由断开或移除的显示管引起。该系统设计用于显示系统，如有源矩阵液晶显示器（AMLCD）。该系统通过使用一个嘀嗒声或三次绕组来感测变压器输出端的电压。来自三级绕组的信号被纠正并与阈值进行比较。如果来自三级绕组的信号大于阈值，则逆变器将关闭一段时间。

95. 发明授权

US5847910A Fault protection device in a transformer 失效
标题翻译：变压器故障保护装置
公开(公告)号：US5847910A
公开(公告)日：1998-12-08
申请号：US926935
申请日：1997-09-10
申请人： Antonios Efantis , Nicolas Alexandris
发明人： Antonios Efantis , Nicolas Alexandris
IPC分类号： H02H1/00 , H02H7/04 , H05B41/285
CPC分类号： H05B41/2855 , H02H7/04 , H02H1/0015
摘要： A fault protection device incorporated in a transformer having a primary winding and at least two secondary windings connected to ground, and having a sensing coil to sense the fluxes generated by each of the secondary windings and generating a flux signal when an imbalance in the fluxes in the secondaries is detected and in which the sensing coil is in the form of at least two sensing coil portions, the sensing coil portions being positioned near but spaced from the sides of the secondary windings, the flux signal being constituted by a voltage induced in the sensing coil by fluxes produced by the secondary windings, and a switch connected to the sensing coil and connected in series with a power supply and at least one terminal of the primary winding, the switch being conditioned to an open condition in response to the flux signal to isolate the primary winding from the power supply.
摘要翻译：一种包含在具有初级绕组和至少两个连接到地的次级绕组的变压器中的故障保护装置，并且具有用于感测由每个次级绕组产生的磁通的感测线圈，并且当通量中的磁通不平衡时产生通量信号检测到二次检测，其中感测线圈为至少两个感测线圈部分的形式，感测线圈部分位于与次级绕组的侧面相邻但间隔开的位置，该磁通信号由在该感测线圈由次级绕组产生的磁通和连接到感测线圈并与电源和初级绕组的至少一个端子串联连接的开关，开关被调节到响应于磁通信号的打开状态以将初级绕组与电源隔离。

96. 发明授权

US5561576A Step down transformer power supply with short circuit protection 失效
标题翻译：降压变压器电源具有短路保护功能
公开(公告)号：US5561576A
公开(公告)日：1996-10-01
申请号：US409593
申请日：1995-03-24
申请人： John R. Baldwin
发明人： John R. Baldwin
IPC分类号： G01R31/06 , G01R31/40 , H02H3/02 , H02H7/04
CPC分类号： H02H7/04 , G01R31/025 , G01R31/027 , G01R31/40 , H02H3/025
摘要： A step down transformer power supply with short circuit protection which uses a minimal size transformer, as opposed to an energy limiting transformer. The transformer is mounted directly on a PC board without additional mounting hardware, and has a fuse in its secondary winding, which is required to pass a UL short circuit test, and is normally nonreplaceable. A low cost circuit limits the current output of the transformer such that the fuse is not blown, even under a shorted output condition, which would normally require replacement of the transformer. A rectifier circuit is coupled across the secondary winding of the step down transformer, and is coupled to a first terminal of a three terminal power regulator circuit which supplies a regulated stepped down voltage through a second terminal connected to a load. The third terminal thereof comprises a current/voltage limiting control terminal. A resistor is coupled in series with the load to sense the output current through the load, and is connected to the base of a transistor having an emitter, collector, and base. The collector and emitter of the transistor are coupled in series with the control terminal of the power regulator circuit, such that as the output current increases above a threshold indicative of a short, the output current of the power regulator is limited to prevent the slow-blow fuse from being blown.
摘要翻译：与限流变压器相反，使用最小尺寸变压器的降压变压器电源具有短路保护。变压器直接安装在PC板上，无需额外的安装硬件，并且其二次绕组中有一个保险丝，需要通过UL短路测试，通常是不可替代的。低成本电路限制了变压器的电流输出，使得即使在短路输出条件下，熔断器也不会熔断，这通常需要更换变压器。整流器电路耦合在降压变压器的次级绕组两端，并且耦合到三端功率调节器电路的第一端子，该三端电力调节器电路通过连接到负载的第二端子提供调节的降压电压。其第三端子包括电流/电压限制控制端子。电阻器与负载串联耦合以感测通过负载的输出电流，并且连接到具有发射极，集电极和基极的晶体管的基极。晶体管的集电极和发射极与功率调节器电路的控制端串联耦合，使得当输出电流增加到高于表示短路的阈值时，功率调节器的输出电流被限制，熔断熔断器。

97. 发明授权

US3855503A Remotely monitored and controlled transformer 失效
标题翻译：远程监控和控制变压器
公开(公告)号：US3855503A
公开(公告)日：1974-12-17
申请号：US40109773
申请日：1973-09-26
申请人： WESTINGHOUSE ELECTRIC CORP
发明人： RISTUCCIA D
IPC分类号： H02H1/00 , H02H7/04 , H02H3/28
CPC分类号： H02H1/0061 , H02H7/04
摘要： A power transformer adapted for remote monitoring and controlling, and system of providing same. The transformer contains a temperature sensor, a pressure sensor, and a deenergizing switch. Electrical signals from the sensors are transferred to a remote load management center which compares the signals to predetermined standards and originates a switching signal when a standard is exceeded. The switching signal opens the switch to de-energize the transformer. The load management center may utilize standards which are fixed or which are variable with other conditions in the power system.
摘要翻译：适用于远程监控的电力变压器及其提供的系统。变压器包含一个温度传感器，一个压力传感器和一个断电开关。来自传感器的电信号被传送到远程负载管理中心，其将信号与预定标准进行比较，并且当超过标准时产生切换信号。开关信号打开开关以使变压器断电。负载管理中心可以使用固定的或与电力系统中的其他条件可变的标准。

98. 发明授权

US3821605A Remote transformer monitoring system 失效
标题翻译：远程变压器监控系统
公开(公告)号：US3821605A
公开(公告)日：1974-06-28
申请号：US27956772
申请日：1972-08-10
申请人： WESTINGHOUSE ELECTRIC CORP
发明人： PENDRAK J
IPC分类号： H01F27/40 , H02H1/00 , H02H3/04 , H02H7/04
CPC分类号： H02H7/04 , H01F27/402 , H01F2027/404 , H02H1/0061 , H02H3/04
摘要： Apparatus for detecting and controlling transformer conditions at a remote location. Detecting sensors and activating controllers are located within the transformer for detecting certain existing conditions of the transformer and for applying control signals for changing the transformer conditions. Signals from the detecting sensors are transmitted to a remote monitoring station where they are processed and displayed. Signals are originated at the remote monitoring station and transmitted to the activating controllers to change the transformer conditions.

99. 发明授权

US3366839A Protective device for gas- or fluidinsulated cascade transformers 失效
标题翻译：气体或流体绝缘级联变压器的保护装置
公开(公告)号：US3366839A
公开(公告)日：1968-01-30
申请号：US49596665
申请日：1965-10-14
申请人： MESSWANDLER BAU GMBH
发明人： DIETER KIND , CLAUS PETERSEN
IPC分类号： H02H5/04 , H02H5/08 , H02H7/04
CPC分类号： H02H5/08 , H02H5/04 , H02H7/04

100. 发明授权

US3366838A Pressure and current responsive protection device for a cascaded transformer arrangement 失效
标题翻译：用于级联变压器布置的压力和电流响应保护装置
公开(公告)号：US3366838A
公开(公告)日：1968-01-30
申请号：US49383165
申请日：1965-10-07
申请人： MESSWANDLER BAU GMBH
发明人： DIETER KIND
IPC分类号： H02H5/08 , H02H7/04
CPC分类号： H02H7/04 , H02H5/08

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式