Inverse-Time Overcurrent & E/F Relays. Type ICM 21, ICM 21B. Station Automation & Protection. ABB Substation Automation Products

Size: px

Start display at page:

Download "Inverse-Time Overcurrent & E/F Relays. Type ICM 21, ICM 21B. Station Automation & Protection. ABB Substation Automation Products"

Debra Tyler
6 years ago
Views:

1 Station Automation & Protection Inverse-Time Overcurrent & /F Relays Type ICM, ICM B ABB Substation Automation Products

Features the driving solenoid has tappings, corresponding to the seven stages of the non-interrupting setting Reliable, robust Ferraris measuring system switch for the relay current.

2 Features the driving solenoid has tappings, corresponding to the seven stages of the non-interrupting setting Reliable, robust Ferraris measuring system switch for the relay current. without gearing or coupling The adjustment of the time setting disc determines Range of time setting 0-00% (see the angle of rotation of the Ferraris disc prior to current/time characteristic) contact making. Range of current setting :, adjustable in The braking magnet consisting of a pair of cross- 7 steps by means of non-interrupting setting magnetized magnets determines the speed of switch rotation of the Ferraris disc at a given current. High resetting current, at least 90% of relay setting Max. overrun time of 0.0 s Temperature -compensated measuring system Instantaneous maximum-current trip with own contact and own visual signal Instantaneous trip is continuously adjustable in either I x.5-0 or I x -0 range and to infinity Separate double-pole tripping contactor with indicator, for high contact rating Low internal consumption. Plug-in active part, the C.T. connections being automatically short-circuited when the relay is withdrawn. Tropicalized design. Fig. - Active part of the relay ICM = Coil terminals of the indicating contactor Application = Indicator button of delayed trip The relay type ICM is an over current relay with an = Contacts of the indicating contactors CV = Time setting disc inverse-time characteristic. That means to say, its 5 = Moving contact pin of the relay time contact tripping time is shorter, the greater the fault current. 6 = Relay time contact As secondary relay parts it is fed by current 7 = Indicator button of instantaneous trip transformers. It is used to protect parts of electrical installations and simple line systems against over 9 = Damping magnet 0 = Damping magnet mounting screw current, earth fault and short circuits. For the = Temperature compensating lever. protection of solidly earthed systems against earth = Pointer of arm faults, relays are available with current setting up to = Locking arm 0. A. The relay can be employed in all situations 5 = Slide for adjusting current where delayed interruption of short circuits is required, provision also being made for 7 = Driving magnet instantaneous tripping at a set maximum current. Design & principle The relay comprises a temperature-compensated Ferraris measuring system which requires no coupling, gearing or hinged armature. The mm thick Ferraris disc of aluminum is drawn by a recall spring, a recall tape and a worm against a stop on the time adjustment disc, and is thus held in its position of rest. The worm compensate for any change in the force of the recall spring within an angle of rotation of o the Ferraris disc of 0. Thus the recall torque remains constant. The driving torque and the angular speed of the Ferraris disc are constant. As a result the current/time characteristics of the relay are exactly proportional.the relays are manufactured with two current/time characteristic for 50 Hz (Fig. 6, 7 ). The characteristic determines the type designation of the particular relay. The current coil of 8 = Drum for setting the instantaneous trip = Switch for setting relay pick-up current 6 = Scale for marking factory adjustment of slide 8 = Coil of the driving magnet 9 = Ferraris disc 0 = Test Contacts T x I a b a b D D Fig. - Wiring diagram of relay types ICMKP, ICMBKP with test terminals (MR 0059) B A C

- 7 5 7 5 current release is drawn by the leakage flux of the driving magnet, acting against the force of a spring. The maximum current setting may be adjusted at the adjusting cylinder.

3 current release is drawn by the leakage flux of the driving magnet, acting against the force of a spring. The maximum current setting may be adjusted at the adjusting cylinder. When set to infinity ( ) the release is blocked. The release has its own contact (normally open) and a signal button which can be reset from outside. The indicating release contactor (CV) has two separate contacts with double interruption and a signal button which pops out when the relay trips and can be reset manually. The contactor coil is a voltage coil. When the relay picks up, the contactor coil is connected to the auxiliary voltage by relay contacts. The breaker tripping current is handled by the indicating contactor. a a b Legend : A : Current coil B : Time-lag contact C : Instantaneous contact D : Indicating tripping contactor : Shorting switch XI : Signal button of instantaneous trip T : Signal button of indicating contactor T T b D It is possible to incorporate two separate indicating contactors, one for the inverse-time tripping, the Fig. - Wiring diagram of relay types ICMNP, ICMBNP with test terminals (MR 005) D B x C Fig. - Wiring diagram of relay types ICMP, ICMBP with test terminals (AK 56) B A A other for the instantaneous maximum-current tripping. The active part of the relay is plugged into the dust-tight casing. The locking arm, normally vertical, can then be pulled down, in which position the active part of the relay is already disconnected from the leads and the C.T. connections automatically short-circuited. The relay can now be entirely withdrawn from its casing, for instance for testing or repair. Designation of types Type of relay ICM Inverse time relay, British Standard / Fig. 6 IS : ICM B Very inverse time relay Fig. 7 The relay casing is supplied for flush mounting in a switchboard. (see Fig. 8). Test terminals, type suffix p At the front of the relays are the easily accessible test terminals 0 (Fig.). When terminals and are provided for relays with two indicating contactors, test terminals can only be provided for relay terminals - 0. Circuit - (signal for instantaneous trip) is therefore not equipped with test terminals. Current/time characteristic 50 Hz For the special model with test terminals a separate test plug (Fig.5) can be supplied. For testing, it is inserted beneath the pair of lugs in the casing, and then the drawout arm is lowered. First of all the shorting switches close, then the connections to the terminals of The armature of the instantaneous maximumthe casing are interrupted and finally the test terminals are connected to the terminals of the test plug. The test plug is supplied with m of cable but without any terminals on the supply side. Fig. 5- Test plug for inverse-time overcurrent relay type ICM.

4 Operating Time sec Operating Time sec x I current at 50 Hz x I current at 50 Hz Fig 6 - Inverse time characteristics (BS / Fig 7 - Very Inverse time characteristics of IS ) of relay type ICM.. relay type ICMB.. Technical data Current range : Relay base current setting I :.5/0 A A.0/.0 A A 0.5/.0 A A 0./0.8 A A 0./0.A A Burden at pick-up current : at 50Hz VA Rated frequency Permissible sustained current Short-circuit strength : thermal (for s) Dynamic 50 Hz x set current 00 x minimum set current 500 x minimum set current Timing element Starting current. x I ± % Closing current Not greater than. x I Time-lag as per characteristic, Fig. 6,7 Max. rror upto x I : ± 0 % to x I : ± 7 % to 0 x I : ± 5 % Reset time when time-lag set to 00% Max. overrun time Reset current approx. 9.5 s 0.0 s >0.9 x I

5 Instantaneous maximum-current trip Setting range.5 0 x / and 0 x / and Max. error up to 0 x I setting ± 0% Operating time at twice set current or over Drop-out current 0.07 s. Max. approx...5 x base current I of relay. Indicating contactor Indicating contactor with voltage coil Rated auxiliary voltage Nominal consumption, 0, 8, 0, 0,50 VDC approx. W on d.c. Nature of free contacts normally open ( or N/C and N/O ) Operating time approx. 0.0 s Contact ratings : sustained current making current max. 0 A max. 0 A Maximal break current Voltage 50 Hz a.c. resistive D.C. and inductive, resistive inductive p.f. = 0. contact 0 V. A 0.8 A 0 V 0 A 6 A A -60 V 6 A 7.5 A contacts in series 0 V 6 A.5 A 0 V 5 A 0 A These are max. values for a small number of operations. To attain a contact life of about 0,000 operations, they should be reduced to about 60%. D.C. L/R = 5 ms General items Test voltage kv/50hz, min. Weight with one indicating contactor.8 kg Weight with two indicating contactors.0 kg Weight of test plug with m cable.5 kg Circuit diagrams see page, Dimensions see page 6

6 Table - Contact arrangements, type designations, wiring diagrams of relay type ICM. Contact Arrangement Relay Type NO NO+NC NO NO+NC Wiring Diagram Instantaneous Current trip range. Current Range Amp. Aux. Supply DC ICM ICMP AK-56 AK-56 N.A. N.A..5-0 x I ICMB - 0 x I ICMBP ICMN ICMNP MR-005 MR-005 N.A. N.A. N.A. ICMBN ICMBNP ICMK ICMKP N.A. N.A. MR-0059 MR x I ICMBK - 0 x I ICMBKP 0. to to to to.5 to 0,0, 8, 0, 0, 50 V ICM ICMB Suffix N Suffix K Suffix P Type Designation Inverse time relay ( Sec at 0 x I ) and with instantaneous current trip unit Very inverse time relay (. Sec at 0 x I ) and with instantaneous current trip unit Without instantaneous current trip unit With two elements of indicating contactor With test terminal Dimensions Ge 55 6 Ob Ir ± Panel cut-out Legend: Aa : Terminals M5 Ir : Mounting frame Ge : arthing lug Ob : Fixing screw Aa Fig. 8 - Dimensions for mounting 5 Rear view

7 Ordering Details Item No.... Qty.... Refer table for selection and mark ( ) appropriate boxes. Relay Type : ICMN ICM BN ICMNP ICM BNP ICM ICM B ICMP ICM BP ICMK ICM BK ICMKP ICM BKP Current Range : A A A A.5-0 A Aux Supply : VDC 0VDC 0VDC 0VDC 8VDC 50VDC Instantaneous Current trip range : - 0 x I set.5-0 x I set Contact : NO + NC NO + NC Arrangement NO NO

8 Network Management Business Management Meter & Load Management Consulting & Services Station Automation & Protection Communications Panorama is the standard for a comprehensive range of integrated solutions for efficient and reliable management of power networks. Using innovative information technology, Panorama delivers total control of the power process, from generation to consumption. The Panorama standard covers six application areas, each offering specific solutions. MDB070 -YN 0-00 Asea Brown Boveri Limited Substation Automation Products Maneja, Vadodara 90 0, India. Tel. : , 608, 6087 Fax : mail : aicds@in.abb.com

Inverse-Time Overcurrent & E/F Relays. Type ICM 21, ICM 21B

Inverse-Time Overcurrent & E/F Relays Type ICM 21, ICM 21B ABB a global technology leader ABB is a global leader in Power and Automation technologies that enable utility and industry customers to improve