The other overcurrent element will be similarly connected. Current setting range (earth fault units). Suitable trip isolating switch and CT shorting switches are provided on the cradle assembly/case.ģ.
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Insultation The relay meets the requirements of IS3231/IEC 255-5 series C - 2 KV for one minute.Ĭase 3D vertical case or horizontal suitable for flush and finished eggshell black and tropicalised. lĮarth fault unit Make and carry for 0.5 s, 7500VA with maxima of 30A and 660V ac or dc.
Make and carry for 0.5 s, 7500VA with maxima of 30A and 660V ac or dc. on any tap.Ĭurrent operated auxilary unit 0.2/2 amp. Series auxiliary unit is used in series with breaker trip coil or tripping relay and has two current taps selected by screw connection.Ģ0 x setting current for 3 sec. Auxiliary unit may be series connected (current operated) or shunt connected (voltage operated). Phase fault units Auxiliary unit with two pairs of self reset contacts to reinforce the disc contact and a hand reset operation indicator provided. For other models, voltage operated auxiliary unit: 30, 110 or 220V dc refer relevant publication for burden details. Voltage operated auxilary unit Type CDAG 51, 3VA version is self powered. Temperature error Under reference conditions of +45☌ to ≥☌.ĬDG 14: ≣% and +5% Earth fault units Error class index E 5.0 as per BS142, 5.0 as per IS 3231. Phase fault units Error class index E 7.5 as per BS 142 7.5 as per IS 3231 Frequency error Timing error less than 8% for a frequency variation of 2 Hz. on any setting.Īuxiliary units and operation indicators l Short time: 20 x setting current for 3 sec. Operating coil tap Multiples of current setting Make and carry for 0.5 s, 2500VA with maxima of 10A and 660V ac or dc. Two pairs, self reset make contacts and a hand reset operation indicator provided. 1.0VA at current setting on highest tap.Ĭontinuous: (for 60☌ rise in coil temperature) Operating coil tap Multiples of current setting VA burden at current setting on highest tapĮarth fault units 0.9VA at current setting on lowest tap. VA burden at current setting on lowest tap Phase fault units Typical impedance/current curves for the various types of phase fault units are given in the CDG 11, 13 and 14 publications. Stabilising resistors with other ohmic values are also available.Ģ0 - 80% or 10 - 40% adjustable in seven equal steps. Types CDG 11, 13, 14 and type CAG 14 relays are described in the relevant publications.Ĭontinuously variable external stabilising resistors of 200 ohms and 50 ohms are supplied as standard for 1A and 5A relays respectively. Type CDAG is a triple pole relay and comprises two induction disc units (type CDG 11, 13 or 14) for phase fault protection and an instantaneous attracted armature unit (type CAG 14) for restricted earth fault protection. Phase fault units 0 - 3.0 sec., 0 - 1.3 sec., 0 - 1.5 sec., 0 - 0.6 sec at 10 times the current setting, depending on the characteristic selected. IDMT element: 50 - 200% - adjustable in seven steps. at 5 times the current setting.įor time/current characteristics, resetting times and overshoot of phase fault units, refer to CDG 11, 13 and 14 publications. For a general description of the highset instantaneous unit, refer to the CAG 17 publication.Įarth fault units 0.025 sec. The relay provides inverse time phase fault protection and instantaneous restricted earth fault protection.Ī highset instantaneous overcurrent unit can be fitted on the two overcurrent elements to provide instantaneous protection under maximum short circuit conditions and to improve discrimination on time graded protective systems. Phase and earth fault protection of transformers, ac machines, feeders etc. Types CDAG 51, 53 and 54 are types CDAG 31, 33 and 34 relays having highset instantaneous units on the two overcurrent elements.Ĭomprehensive range of auxiliary and highset unit ratings for phase faults.ĭust tight drawout case and tropicalised finish.
Types CDAG 31, 33 and 34 are type CDAG relays having inverse, very inverse and extremely inverse time overcurrent units respectively and an instantaneous earth fault unit, type CAG 14. High stability on external earth faults for restricted earth fault protection. Instantaneous sensitive earth fault protection. Identical time/current characteristics on all taps for overcurrent units.
Type CDAG Combined Overcurrent and Earth Fault Relay Features l Type CDAG Combined Overcurrent and Earth Fault Relay
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