1、121. Application 应用The URF 25/10 monitoring relay is an alarm device for oil-insulated high-duty tapping switches of transformer from damage as might be caused by failure of the tapping switch system or the application of excessive currents (strong arc) due to a transformer defect. URF25/10 油流继电器是有载
2、调压分接开关的一个报警装置。当分接开关内部出现故障或由于变压器本体故障引发短路电流（大电弧）时，可起到保护分接开关的作用。On response the monitoring relay will generate a continuous pulse operating the circuit breaker of the transformer to be protected and disconnecting the latter from the source of supply. Observing the instructions of the plant operator, th
3、e transformer can be restarted only after operation of the test and reset button.当故障时，油流继电器持续发出信号以断开变压器的主断路器，这样可以保护后级电气装置不受损坏。按照生产商操作手册的说明，仅当操作油流继电器上的试验和复位按钮后，变压器才能合闸继续运行。The monitoring relay is available with single and double-contact circuit system. On response of the baffle plate due to an increa
4、sed oil flow, the double-contact circuit provides two signals, hence improving operational safety of the equipment.油流继电器可以提供单触点和双触点两种形式。当油流继电器内动作挡板由于油流作用动作时，双触点电路可提供两组独立的信号，这样可以进一步提高设备的安全性。2. Construction结构The monitoring relay consists of the following sub-assemblies:油流继电器由以下部件组成：1) Casing assembly
5、机壳2) Cover assembly 机盖3) Switch mechanism 信号机构2.1 Casing assembly 机壳The casing consists of weatherproof light metal casting. To check the switch system for proper function, the casing is provided with inspection glasses arranged opposite each other. On request, the inspection glasses can be provided
6、 with hinged lids.机壳由防风雨的轻金属材料制成。机壳前后各自安装了一个观察窗，以便于检查内部信号机构的工作情况。如需要的话，观察窗处可另加可旋转的保护盖。2.2 Cover assembly 机盖The cover consists of a weatherproof light metal casting. The connection box, the test and reset button and a technological bleeder screw are arranged above the cover.机盖由防风雨的轻金属材料制成。上面安装有接线盒，试验
7、和复位按钮和放油用的螺栓。In addition to the earth connection, the connection box accommodates the electric bushings in the floor. The connection box is closed by a hinged cap so that it is accidental-shock safe and no dirt get inside the box.除有接地点外，接线盒内还提供了信号引出的接线柱。接线盒上有一个盖子可以防止意外撞击和灰尘进入内部。The connecting cable
8、can be inserted optionally through either PG 16 screwed conduit. The test and reset button is covered by a cap nut.3信号连接电缆可以从任一个 PG16 螺纹管内接入。试验和复位按钮上有一个螺帽保护。2.3 Switch mechanism信号机构The switch mechanism consists of the following major components:信号机构由以下部件构成：- Frame as support element支撑框架- Functional
9、element, switch system动作单元，开关系统- Mechanical testing equipment for functional testing测试动作情况的机械试验装置The switching system consists of the following components:开关系统由以下部件构成：- Baffle plate挡板- Switching magnet动作磁铁- Magnetic switch磁性开关The baffle plate is retained in its normal and response positions by perma
10、nent magnets. Via a link the switching magnet is firmly connected with the baffle plate and initiates the contact-making process of the magnetic switch at a certain oil flow.挡板由永久磁铁控制在正常工作位置或是在动作位置。通过一个干簧管，动作磁铁被紧密连接在挡板上。当油流速度超过整定值后，动作磁铁就会带动磁性开关的触点吸合。3. Mode of operation 操作方式If the oil flow from the
11、tapping switch to the expansion tank is excessive or inadmissible, the monitoring relay will be tripped. The oil flow acts on the baffle plate and when the response value set is exceeded, the plate will be operated. Then, the shutoff signal will be tripped.当有载调压开关绝缘筒内的油由于故障膨胀而高速流向油枕时，油流将推动油流继电器内部挡板到
12、动作位置，然后油流继电器将发跳闸信号给主断路器。4. Installation 安装The installation and operating instructions supplied with the monitoring relay describe in detail the installation and electrical connection of the monitoring relay.油流继电器包装内有详细的安装操作指南。有关于安装和电气连接请参考此指南。5. Technical data 技术数据Parameter 参数 Value / Specification
13、值 / 规格 Notes 说明Rated voltage 额定电压 230V A.C. 12V to 250V 230V D.C. 12V to 250VRated current 额定电流 2A A.C. 0.05A to 2A2A D.C. 0.05A to 2AInsulation voltage 绝缘电压Capacity 容量 2000V A.C. Casing contact 短路Ambient temperature -45C to +55C Others available on 4Parameter 参数 Value / Specification 值 / 规格 Notes 说
14、明环境温度 request承接特别要求Insulating liquid 绝缘油- Type 类型 Transformer oil 变压器油 Others available on request承接特别要求- Temperature 温度 -25C to +115COthers available on request承接特别要求- Viscosity 粘滞度 1mm2/sec to 1100mm2/secOthers available on request承接特别要求Response values of the baffle plate 挡板整定值0.9m/sec 2.0m/sec Ot
15、hers available on request承接特别要求1.0m/sec 2.5m/sec1.2m/sec 3.0m/sec1.5m/sec 4.0m/secResponse time of the baffle plate 挡板动作时间 0.1 secNominal installation position 安装位置2% rising towards the expansion tank2% 往油枕方向上翘2% to 4%Type of protection 保护等级 IP44Others available on request承接特别要求Climatic suitability适
16、应环境Suitable for warm and humid as well as extremely cold open air climates适用于各类炎热、潮湿和寒冷的户外环境Others available on request承接特别要求6. Types 型号The monitoring relay is manufactured three basic types with identical external dimensions. The following types are available:此油流继电器有三种基本型号，尺寸完全相同。分别为：- URF 25/10-1
17、Single-contacted circuit 单触点(Contacts: 1 NO contact, 1 NC contact or 1 change-over contact)（触点：1 常开，1 常闭，1，转换触点）- URF 25/10-2 Double-contact circuit 双触点(Contacts: 2 NO contacts, 2 NC contacts, 1 NO contact and 1 NC contact, 2 change-over contacts or 1 change-over contact and 1 NO or NC contact)（触点：2 常开，2 常闭，1 常开和 1 常闭，2 转换触点或 1 转换触点和 1 常开或常闭）- URF 25/10-3 Version approved by RWE Energie AG Germany 德国 RWE Energie 公司定制。(Contact: 1 change-over contact) （触点：1 转换触点）5
