Item No.: CO3301-4M

Transformer / Generator differential protection relay with time over current protection

Training panel with digital, three-phase current differential protection and overcurrent time protection for machines and transformers (protected object). Fault notifications and operating status are indicated by LEDs and shown on a display.

Functions of current differential and overcurrent time protection

Configurable trip delays
Configurable trip characteristic
Configurable definite-time trip limits

  • Current differential protection (Id)
  • Stabilising current protection (Is)

Configurable converter ratio
Configurable vector group
Transformer inrush current protection/suppression
Separate adjustable converter ratios for high-voltage and low-voltage sides of the transformer/machine to be protected

Monitoring and protective functions:

  • Transformer differential protection (for 2 windings), Id, curve with zero-point calibration and three gradient settings, plus non-stabilised high-current differential stage IdH, stabilisation via 2nd, 4th and 5th harmonics (ANSI 87T)
  • Earth current differential protection, IdE, similar curve to 87T (ANSI 87TN)
  • Overcurrent/short-circuit protection (non-directional) (ANSI 50P / 51P)
  • I2>, asymmetric load protection with evaluation of negative-sequence currents (ANSI 46)
  • ThA, overload protection with thermal imaging and separate settings for alarm and tripping (ANSI 49T)
  • IH2/In, inrush detection for overcurrent – short-circuit protection (ANSI inrush)
  • IE, earth-overcurrent/short-circuit protection (non-directional) (ANSI 50N/51N)
  • Circuit breaker failure protection (ANSI 50BF)
  • Trip circuit monitoring (ANSI 74TC)
  • Current transformer monitoring (ANSI 60L)

Inputs and outputs: 4-mm safety sockets:

  • 6 Digital inputs
  • 5 Alarm relays (250 VAC, 2 A)

Operation and display:

  • LCD with LED backlighting, 128 x 64 pixel resolution
  • 14 Arbitrarily definable two-colour LED indicators
  • 8 Soft keys for operation and parameter setting

Technical data:

  • Nominal current: IN = 1 A
  • Nominal voltage: UN = 400 V
  • Nominal frequency: 50-60 Hz
  • Interfaces: USB, Modbus TCP/IP
  • Dimensions: 297 x 456 x 250mm (HxWxD)
  • Weight: 7 kg