DSR-8 Current Differential Relay
The DSR-8 is a device for measurement and monitoring of differential current at generators, motors and transformers. As well possible is the monitoring of mixed constructions, such as a generator with an upstream transformer. In addition to the differential current, it is also possible to measure the individual conductor currents as well as the earth current in three-wire networks. The connection to the system must be done using external current transformers.
The DSR-8 includes the following protective functions [according to ANSI/IEEE C37.2]: - Protection on differential current for generators, motors and transformers [87GP, 87MP, 87TP] - (Earth-) overcurrent protection [50, 50N, 50G] - Overcurrent-time-protection [51] - Frequency monitoring [81U, 81O]
The comfortable configuration of all settings of the DSR-8 is done by means of the para-meterisation software 'Geräteverwaltung' (GV 2 – Version V2.36 or later required). Alternatively values can be entered directly at the device. Any access to the device's parameterisation can be protected by a PIN. The output of display-texts at the device standardly takes place in German and English (switching between languages is possible at any time during operation). Alternative languages, suitable to the customers requirements, can be configured and conveniently made available, by means of our parameterisation software ''Geräteverwaltung'.
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Technical data |
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| Auxiliary voltage | 24 V DC (18 – 36 V DC) 230 V AC / 12 V DC * |
| Power consumption | approx. 4 W at 24 V DC approx. 6 VA at 230 V AC *on customers request |
| Digital inputs | LowActive (contact voltage 12 V DC, 5 mA, opto-decoupled) cables not longer than 3 m. |
| Relay outputs | 230 V / 50 cy / 2 A (potential free) |
| Ambient temperature | in operation: -20 … +55 °C transport / storage: -25 … +55 °C |
| Dimensions | W / H / D 100 x 75 x 110 mm for mounting on 35 mm top-hat rail according to DIN EN 60715 |
| Measurement range | approx. 0.02 to 4.0 A AC (1 A Version) approx. 0.08 to 20.0 A AC (5 A Version) tolerance < 0.2 % of full scale |
| Frequency: | 15.0 cy up to 100.0 cy from approx. 150 mA measured accuracy< 0,01 cy |
| Download PDF |  Data sheet |
 Description |
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| Ordering information | DSR-8 / 1 A / 24 V DC: E1988 DSR-8 / 5 A / 24 V DC: E1990 |
| Accessories | USB A : USB Mini B parameter. cable 1,5 m: KC0215 parameter. cable 3,0 m: KC0329 current transformers, various converter ratios, e.g. 200A/5 A |