KBCH 120, 130, 140 - ElectricalManuals.net
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1. A B C wel fe Sy B s Logic input common 1 43 4 e e lo gt HVLV1 LV2 Vi trip nia ire ml E 4 Initiate aux timer 3 L3 9 a aS la 501 11 R akal Ti a Initiate aux timer 4 L4 Ip i 2 SF oe nivale aur Umer by Case earth connection a1 1a op 5 sa Sa y Ta sl iti ji pl i R Aa E e Initiate aux timer 5 L5 9 5 54 Si ra senoes lia wat iE l Initiate aux timer 6 L6 e Ji 56 5 gt K Bus communications port Module terminal blocks SONI viewed from rear l See Nos T Initiate aux timer 7 L7 e ila les y 7 fs Logic input common 21 e gt a Notes 1 a 2S CT shorting links make 2 VT input must be supplied with phase phase voltage before b and c disconnect Connections are typical only b Short terminals break before c 3 Earth connections are typical only SCN Screen connection for K Bus KBCH Quick to configure simple to test PEPEE KBCH 120 Notes 1 See Service Manual R8530 for the setting of the external stabilising resistor ene 2 Optional voltage limiting non linear resistor see Service Manual R8530 Figure 7 gt Technical Data 24 125V dc 20 150V dc or 190V crest 110V 50 60Hz ac 50 133V ac 48 250V dc 33 300V dc or 380V crest 220V 50 60Hz ac 87 265V ac Field voltage supply for optically isolated digital inputs 48V dc current2. gt Over 10 500 KBCH differential relays delivered since launch in 1994 gt gt MiCOM P63x series available for fully integrated transformer protection with extra overcurrent protection and Programmable Logic PSL gt gt KVGC 202 available for voltage regulation tap change control marks of AREVA 389191982 RCS PARIS Printed in France SONOVISION ITEP demarks and servi version thereof 2005 AREVA AREVA the AREVA logo and any mes or trademarks mentioned h K BCH BR 04 05 0910 GB d trademark of AREVA AUTOMATION MiCOM is a regi Our policy is one of continuous development Accordingly the design of our products may change at any time Whilst every effort is made to produce up to date literature this brochure should only be regarded as a guide and is intended for information purposes only Its contents do not constitute an offer for sale or advise on the application of any product referred to in it We cannot be held responsible for any reliance on any decisions taken on its contents without specific advice
3. 0 140 HV LV x2 3 J KBCH130 140 HV x2 LV1 LV2 4 Only KBCH140 HV LV1 x2 LV2 4 B Only KBCH140 HV x2 LV x2 4 8 Only KBCH140 Transformer generator or reactor differential and busbar protection arrangements with up to 4 feeders CASE The KBCH unit is housed in a size 8 Midos case as shown in Figure 8 200 Figure 8 Push button Case outline size 8 F k men All dimensions in mm projection 10 max ie E 4 holes 4 4 24 aa L eer Panel cut out Flush mounting fixing details 32 I 212 Flush mounting L INFORMATION REQUIRED WITH ORDER Unit type KBCH1 L e 2 bias inputs per phase 3 bias inputs per phase 4 bias inputs per phase w Configuration Standard Case Size Size 8 Midos flush mounting Auxiliary voltage 24 125V 48 250V Rating Vn 100 120V In 1A Vn 100 120V In 5A Vn 100 120V In 1A 5A Ver Language English French German Spanish og nmm Not available for KBCH 130 AREVA T amp D Worldwide Contact Centre http www areva td com contactcentre Tel 44 0 1785 250 070 www areva td com www areva td com protectionrelays AREVA TRACK RECORD TRANSFORMER DIFFERENTIAL PROTECTION Over 34 000 predecessor MBCH relays shipped gt
4. PROTECTION KBCH 120 130 140 Differential Protection for Transformers and Generators Type KBCH relays offer biased differential current t EJ restricted earth fault and overfluxing protection O a R A primarily for the protection of two or three winding power transformers auto transformers or generator transformer units The KBCH provides these features in a very compact and space efficient case size for ease of installation All models are three phase units with internal vector group compensation and line current aE transformer ratio correction thus eliminating the a i oa need for interposing transformers Figure 1 Up to four biased current inputs per phase can be provided to cater for power transformers with more than two windings and or more than one circuit breaker controlling each winding as in mesh or one and a half circuit breaker busbar arrangements Versions are available that can accommodate a mixture of 1A HV and 5A LV CTs as well as standard models having all 1A or all 5A CTs KBCH relay MODELS AVAILABLE gt KBCH120 offers 2 bias inputs per phase for the protection of a two winding power transformer gt KBCH130 Customer Benefits Biased differential protection e Restricted earth fault protection e Overfluxing protection e Integral CT ratio and vector group compensation e Measurement of phase differential and bias currents AREVA T amp D off
5. ers 3 bias inputs per phase for the protection of a three winding power transformer or a two winding power transformer with 2 sets of CTs on one winding gt KBCH140 offers 4 bias inputs per phase AREVA All models are available with either 1A or 5A inputs on the primary and secondary side Alternatively the KBCH 120 and 140 can be provided with 1A CTs on the high voltage windings and 5A CTs on the low voltage windings In addition to the biased differential protection restricted earth fault protection has been included to cover a larger percentage of the transformer windings Figure 7 shows some typical restricted earth fault applications The differential protection has been designed to restrain when the transformer is overfluxed so that an instantaneous trip is not issued for transient overfluxing Since a transformer cannot withstand a severe overfluxing condition indefinitely time delayed overfluxing protection and an alarm stage has been incorporated Contacts that monitor the status of external plant such as Buchholz protection and temperature measuring devices can be connected to any of the eight control inputs that are available Each input can be routed to any number of the output relays via a variable time delay if required FUNCTIONS gt Biased differential element Each relay contains a biased differential element per phase with a characteristic as sho
6. h 1 normally open and 1 normally closed contact is also available gt Alternative setting group Two setting groups are provided This allows the user to set one group to normal operating conditions while a second group may be set to cover alternative operating conditions ANCILLARY FUNCTIONS gt Measurements The relay can display the magnitude of phase currents for each input differential current and average bias current The power system frequency is also displayed gt Fault records The fault flags for the last five faults are recorded by the relay Additional records of the magnitude of the fault currents are also stored for the last fault Operating time as a function of the actual excitation and the set starting value for different time multiplier settings K time s 1000 100 1 14 1 2 1 3 1 4 1 5 1 6 Wi V f setting Figure 4 Inverse time characteristic for overfluxing protection gt Event records Fifty events can be stored in a buffer Software is available to allow the events to be accessed remotely by a PC via the communications system gt Disturbance records Oscillography The analogue channels record up to nine phase currents three per transformer winding three differential currents three average bias currents and the voltage The digital channels record the status of the output relays and control inputs gt Power on diagnostics and self monit
7. ided on settings which alter the configuration of the relay any accidental change to which could seriously affect the ability of the relay to perform its intended function c e Long terminals d Pin terminal PCB type Figure 6 Typical application diagram KBCH120 69 Dall pzd 64 70 65 Zi Z Bd 66 Ri 167 731 pa Bzg i KBCH 120 K 75 21 7 m a Je 22 78 123 791 ZE Je F d 25 Dae 26 2 27 83 HV lo gt see Figure 10 S E 3 Z TV1 lo gt see Figure 10 128 H A 1 41 A wD eb Relay healthy roo 8 PZ Bee Bd Pete smd 5 w Bt Roly ad x les Phase tation j 30 a N Lo ti eane Id gt gt A B C H REO 732 io gt HVLV1 Lv2 Vif trip 34 aie ALi ast bp 9 gt ABC 1d gt gt ABC ZEEE lo gt HVLVI LV2 Vit trip 38 af of c i e Id gt AB C Id gt gt A B C zat be tenuis Vit trip 42 117 ie ae To pene eae 37 NeT C a Sg ee en 291 s 4 amp A g e tal RL 3i thr 4 ele B l Sa BA By ER SI D gt a Se Initiate aux timer 0 LO 93 z xt aa gt amp St f Yat 5 7_ 51 f Tap down 63 170 I O amp Initiate aux timer 1 L1 KAR mul g a A I Y RLS ai Aum vila UG yet Initiate aux timer 2 L2 4s ni ao ol y oal le Y niga at erage Id gt gt
8. ivity for earth faults is obtained by including restricted earth fault protection A separate element per winding is provided An externally mounted stabilising resistor will be necessary for optimum performance In applications where heavy internal earth fault levels can occur and where a high stabilising resistor setting is used a voltage limiting non linear resistor may be required gt Overfluxing Alarm and Tripping Protection A single phase phase connected voltage input is provided to enable overfluxing detection Alarm and tripping characteristics which are based on a measurement of the voltage frequency ratio are provided The alarm is definite time delayed whilst the trip characteristic may be selected as either definite time or an IDMT curve Figure 4 Integrated transformer protection in a small package for ease of fitting retrofitting CONFIGURATION The setting of logic function links together with the input and output masks define the way the relay will operate This allows Selection of features Implementation of user defined logic using auxiliary timers 8 available Control of the integral disturbance recorder gt Inputs and outputs KBCH has 8 optically isolated inputs which may be reassigned by the user with any of the available functions from the setting menu There are 8 programmable outputs each comprising a relay with 1 normally open contact A dedicated watchdog contact wit
9. limit 60mA gt Operating time low set typically 30 35ms high set typically 15ms REF typically 20 40ms Vector group and ratio correction Typical restricted earth fault connections HV Ratio Cor primary LV1 Ratio Cor secondary LV2 Ratio Cor tertiary Yy0 Odeg Yd1 30deg Yd2 60deg Yd3 90deg Yd4 120deg Yd5 150deg Yy6 180deg Yd7 150deg Yd8 120deg Yd9 90deg Yd10 60deg Yd11 30deg Ydy0 Odeg Ydy6 180deg HV Ratio Cor primary 0 05 to 2 in steps of 0 01 LV1 Ratio Cor secondary 0 05 to 2 in steps of 0 01 LV2 Ratio Cor tertiary 0 05 to 2 in steps of 0 01 gt Digital Inputs Optically isolated inputs gt Contacts gt Contact ratings 8 energised from the 48V field voltage e Output relays 8 single make gt Watchdog relays 1 make and 1 break Make 10A and carry for 0 2s e Carry 5A continuous Break DC 30W resistive 15W inductive L R 0 04s AC 1250VA 5A maximum e Make 30A and carry for 0 2s Subject to maxima of 5A and 300V e Carry 5A continuous e Break DC 50W resistive 25W inductive L R 0 04s AC 1250VA 5A maximum Subject to maxima of 5A and 300V TRANSFORMER CONFIGURATION No of bias i F A Setting inputs Configuration Applicable to HV LV 2 6 KBCH120 130 140 HV HV LV1 LV2 3 O KBCH130 140 Lvi LV2 HV x2 LV 3 8 KBCH13
10. oring Power on diagnostic tests are carried out by the relay when it is energised Continuous self monitoring in the form of watchdog circuitry and memory checks are also performed In the event of a failure the relay will either lock out or attempt a recovery depending on the type of failure detected Figure 5 Basic communication system Relay 4 Relay 3 g Desktop computer PC Protocol converter i H o pooooooooooooooo poooooonoonnnonnnnnn USER INTERFACE gt Front panel user interface The features of the relay can be accessed through a menu driven system The user can move around the menu by means of the keys on the relay frontplate This can be done with the cover in place but any change to the settings requires the cover to be removed gt Remote access user interface The menu table can also be accessed via the remote communications facility This allows all of the menu screen of a PC cells in a column to be displayed simultaneously on the gt Relay interconnection The relays can be interconnected via a shielded twisted wire pair known as K Bus The K Bus is connected through a protocol converter known as KITZ either directly or via a modem to the RS 232 port of the PC This system allows up to 32 relays to be accessed through one RS 232 communications port Figure 5 gt Password protection Password protection is prov
11. wn in Figure 2 The KBCH has a dual slope bias characteristic The initial slope of 20 from zero to rated current ensures sensitivity to faults whilst allowing for up to 15 mismatch when the power transformer is at the limit of its tap range in addition to current transformer ratio errors At currents above rated extra errors may be gradually introduced as a result of CT saturation The bias slope is therefore increased to 80 to compensate for this The current waveform associated with magnetising inrush is characterised by a period of each cycle where its magnitude is very small as shown in Figure 3 By measuring the time of this period of low current an inrush condition can be identified Overfluxing restraint is conditioned by the percentage of fifth harmonic current present gt High set differential element An additional high set instantaneous differential element is provided to ensure rapid clearance of heavy faults This element is essentially peak measuring to ensure fast operation for internal faults with saturated CTs Operate Differential current xIn SS See Restrain I1 11 13 414 Ne jowan Y Setting range 0 1 0 5In 0 3 3 4 11 12 I3 14 Effective Bias xIn s Figure 2 Biased differential characteristic AO oS a ar c O Figure 3 Typical magnetising inrush waveforms gt Restricted earth fault protection Greater sensit
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