LOPO. Low Power Instrument Transformers. For Medium Voltage Switchgear
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1 LOO Low ower nstrument Transformers For Medium Voltage Switchgear
2 2 LOO Low ower nstrument Transformers For Medium Voltage Switchgear The introduction of digital technology to measurement and protection instrumentation has modified the requirements for instrument transformers. Trench has developed LOO, a range of voltage and current low power instruments transformers, covered by patents, compatible with digital technology and meeting the requirements of EC standards and LOO are designed for burdens significantly lower than conventional instrument transformers. The output signal for the Trench Low ower Voltage Transformer is volts rather than conventional hundreds of volts; the Low ower Current Transformer output is millivolts rather than conventional amperes. These low power instrument transformers fit into existing as well as future design of switchgears. Several combinations of these instrument transformers with relays from different manufacturers (lstom, SEL, Siemens, Vaasa etc...) and recorders have been successfully tested and field installed. lease refer to the separate leaflet for an up dated list of available relays. Example of integration in a medium voltage switchgear and indication of size comparison Bus bar Vacuum breaker Cable connection Low power current transformer Conventional current transformer Low power voltage transformer 3 to 5 kg Conventional voltage transformer 20 to 50 kg LOO is a registered trademark of Trench
3 3 Features Designed for low power digital protection and measuring in accordance with: EC , Electronic Voltage Transformers, EC , Electronic Current Transformers Cost effective One LOO meets both measuring and protection requirements: a single instrument transformer for measurement and protection purposes, Reduced size and weight: easy to handle, less space required, new opportunity to optimize medium voltage switchgears for size, manufacture, logistics and operation. The low power instrument transformers are supplied with standardised cables and connectors: connection cable, standard length 6,5 m, ODU Mini Snap* connector for connection to the secondary device (see page 6). * Other types on request EMC immunity. Operator safety with earthed metal encapsulated housing. No secondary circuit problem: low power voltage and current transformers can have their secondary open or short circuited. mportant safety feature. High reliability and availability. Environmentally friendly, less raw material required. Medium voltage applications up to 40 kv Rated primary current up to 5000 Rated short circuit current withstand up to 63 k / 3 s Type tested to EC standards Meets EC and requirements Few models to cover the whole range Compact, light and easy to connect Quality ssurance in accordance with SO 900
4 LOO Voltage Transformers The Trench low power voltage transformer LOO is a passive device based on a compensated resistive divider, designed for medium voltage protection and measuring systems in accordance with EC Benefits: One resistive divider for all metering and protection requirements, e.g. class 0.2 or 0.5 and 3. Ferro-resonance free These transformers provide a secondary voltage proportional to the primary voltage, without saturation. LOO transformers are available in different designs, covering the range 6 to 36 kv. No disconnection of the voltage transformer is required during cable and switchgear voltage testing. The voltage transformers are able to withstand the on-line switchgear and cable voltage testing: The components are cast in resin and encapsulated in a metallic housing. Connecting cable (double shielded twisted pair) and connector are parts of the voltage transformer. Very low voltage error and phase displacement. pplied voltage Frequency Duration 2 U m / 3 50 / 60 Hz 60 min 3 U m / 3 0. Hz 50 min 4 U m / 3 DC min Electrical data Type Design Highest voltage for equipment Rated primary voltage Rated power frequency test voltage BL Rated secondary voltage See on p. 6 and 7 U m (kv)* U pr (kv)* U d (kv)* U p (kv)* U sr (kv)* LVT 7, / LVT 2-2 0/ LVT / LVT / LVT / LVT / LVT / *: other values and designs on request System frequency: 6 2/3, 50, 60 Hz ccuracy: Class 0.2 or 0.5 & 3 the accuracy of the voltage transformer is guaranteed between 40% and 20% of the rated voltage Rated voltage factor:.2/continuous;.9/8 hours Type tests: n accordance with EC , including immunity tests and measurement of transmission overvoltage factor 4
5 LOO 2 U pr 3 a U sr Metering n rotection Control N Metal housing 4. Twisted cable pair 2. Cast resin 4.2 nternal screen 3. Over voltage protection 4.3 External screen (gas arrester) 5. nput circuit impedance 4. Double twisted shielded cable rinciple scheme Example of accuracy performance Voltage error (%) 4 3 limits of error measured value Typical voltage error with class 0.2 & 3 U/Upr (%) hase error (min) limits of error measured value Typical phase error with class 0.2 U/Upr (%) 5
6 6 LVT -: Low power voltage transformer vailable up to Um 24 kv Same dimensions for all voltages. rimary connector according to EN 508 (DN 47636), type 24 kv, 250. Outline drawing: Weight: 3.2 kg Connector Bus bar Twisted pair and double shielded cable. 00 M8 Bushing Enclosure 2 3 x φ0 on φ22 LVT -: Low power voltage transformer vailable up to Um 36 kv. Same dimensions for all voltages. rimary connector according to EN 508 (DN 47637), type 36 kv, size 2. Outline drawing: Weight: 4.0 kg Connector Bus bar φ20 Twisted pair and double shielded cable. 35 Bushing Enclosure 8 39 ODU - MN SN connector rotection against polarity reversal Test voltages: 2.5 kv C / 5 kv peak
7 7 LVT -: Low power voltage transformer for SF6 switchgear. vailable up to Um 36 kv with the same dimensions. The LVT- model is suitable for single phase encapsulated SF6 switchgear. Outline drawing: Twisted pair and double shielded cable, with connector. Weight: 5.2 kg. Bus bar SF6 32 φ296 φ239.4 Diameter and holes to requirement Enclosure LVT -: Low power voltage transformer for SF6 switchgear. vailable up to Um 36 kv with the same dimensions. The LVT- series is suitable for encapsulated SF6 switchgear. Outline drawing: Weight: 4.0 kg. Bus bar SF 6 Enclosure Twisted pair and double shielded cable, with connector Bus bar 30 φ φ45 M
8 LOO Current Transformers The Trench low power current transformer LOO is a passive device, based on the principle of a ring core transformer with an integrated precision shunt, designed for medium voltage protection and measuring systems in accordance with EC The LOO current transformer provides a voltage output proportional to the primary current. t replaces conventional current transformers with significant space and weight advantages. Benefits: Only one core required for all measurement and protection requirements, e.g. class 0.2 or 0.5 and 5, with the transient performances of TY cores in accordance with EC Reduced inventory: one LOO current transformer covers currents from 50 to Linear and saturation free up to short time current. nsensitive to burden: accurate for a total burden 20 kω, making it possible for several relays and meters to be connected in parallel to the LOO current transformer without affecting accuracy. Connecting cable (double shielded twisted pair) and connector are parts of the LOO CT Very low voltage error and phase displacement (ideal for earthfault protection). Technical data Measuring range Each LOO CT covers the range from 50 up to 5000 Rated primary current pr : 50 up to 5000 Secondary voltage* U sr : 22.5 mv up to 2.25 V e.g. pr = 000 => U sr = V th = 0 k => U sr = 4.50 V System frequency: 6 2/3, 50, 60 Hz Rated short time thermal current: up to 63 k / 3 s ccuracy*: Class 0.2, 0.5 or.0 and simultaneously class 5 up to 63 k Usr (V) , 0, pr () Burden: 20 kω For distance protection *: other values and designs on request Type tests: n accordance with EC , including immunity tests and measurement of the overvoltage transmission factor 8
9 LOO 2 2 S 3 U sr S Measuring, Control, rotection 3.3 pr. Metal housing 3. Twisted cable pair 2. High stability shunt 3.2 nternal screen 3. Double shielded cable 3.3 External screen rinciple scheme Example of accuracy performance 0,5 limits of error measured value 0-0, Typical current error with class 0.2 pr () hase error (min) limits of error measured values pr () Typical phase error with class 0.2 9
10 0 LCT 25-: Low power current transformer vailable for rated current up to Outline drawing number: Weight: 4.0 kg Twisted pair and double shielded cable with connector φ M8 63 LCT 25-B: Low power current transformer vailable for rated current up to Outline drawing number: Weight: 4.2 kg φ x φ25 on CD 90 φ25 Twisted pair and double shielded cable with connector φ70 LCT 25-C: Low power current transformer vailable for rated current up to Outline drawing number: Weight: 6.0 kg 5,5 φ 303 Twisted pair and double shielded cable with connector 370 LCT 25-D: Low power current transformer vailable for rated current up to Outline drawing number: Weight 5.5 kg Φ Twisted pair and double shielded cable with connector 6 82
11 LCT K-60: Split core low power current transformer Rated current 60 (vailable for rated current up to 00 ). Outline drawing number: Weight: 5.0 kg Twisted pair and double shielded cable with connector φ rinciple: The LOO split core current transformer sums magnetically the three line currents (Fig. ) to measure the zero sequence current of the three lines. This method provides a better result than obtaining the zero sequence by the summation of the output signals of three single current transformers. pplication: Measurement of zero sequence in networks with isolated or compensated neutral point (arc suppression coil or etersen coil) for detection and disconnection of faulty feeders in a substation (Fig. 2). Error of a LOO split core transformer type LCT K with voltage output. Current % 0, () ( N =00 ) 0, Current error (%) 6 3,5,2 hase error ( ) 3,5 0,5 0,5 0,5 Metallic screen Split core transducer Cable L L2 L3 Earthing of the metallic screen Fig. : Measurement of earthfault current Fig. 2: Mounting of the split core transformer
12 Trench Facilities The Trench roup is your partner of choice for electrical power transmission and distribution solutions today; and for the development of your new technology solutions of tomorrow. Trench ustria mbh aschinger Strasse 49 ostfach Linz-Leonding ustria hone: Fax: Trench Brasil Ltda Via Expressa de Contagem, 2685 Contagem, Minas erais CE Brazil hone: Fax: Trench China MWB (Shanghai) Co., Ltd. No. 3658, Jiancheng Road Minhang, Shanghai eoples Republic of China hone: Fax: Trench High Voltage roducts Ltd., Shenyang No. 2 Zhengliang Er. Road Jing Shen Xi San Street Dao Yi Economic Development Zone Shenyang 036.R. China hone: Fax: Trench Limited Bushing Division 432 Monarch venue jax, Ontario Canada LS 27 hone: Fax: Trench Limited Coil roduct Division 7 Maybrook Drive Scarborough, Ontario Canada MV 4B6 hone: Fax: Trench Limited nstrument Transformer Division 390 Midwest Road Scarborough, Ontario Canada M 3B5 hone: Fax: Trench Limited ower Line Carrier Division 85 Middlefield Road, Unit 6 Scarborough, Ontario Canada MV 29 hone: Fax: Trench France S.. 6, Rue du énéral Cassagnou B.. 70 F St. Louis, Cedex France hone: Fax: Trench ermany mbh Nürnberger Strasse 99 D Bamberg ermany hone: Fax: Trench Switzerland Lehenmattstrasse 353 CH-4028 Basel Switzerland hone: Fax: Trench (UK) Limited South Drive Hebburn Tyne & Wear NE 3 UW hone: Fax: E 90 Subject to change without notice ( ) rinted in Canada.
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