中文版
Description
MRN3-11D | MRN3 – Mains decoupling relay
Product Description
The MRN3 is a universal mains decoupling device and covers the protection requirements from
VDEW and most other utilities for the mains parallel operation of power stations.
- Over/ and under voltage protection,
- over/ and under frequency protection,
- extremely fast decoupling of generator in case of mains failure (MRN3-1) or
- rate of change of frequency df/dt (MRN3-2)
Because of combination of three protection functions in one device the MRN3 is a very compact mains decoupling device. Compared to the standard used single devices it has a very good price/performance ratio.
For applications where the single protection functions are required SEG can offer the single MR
relays as follows:
- MRU3-1 four step independent over-/ and under voltage protection (also used for generator earth fault protection).
- MRU3-2 two step independent over-/ and under-voltage protection with evaluation of the symmetrical voltage components.
- MRF3 four step independent over/ and under- frequency protection and two step frequency gradient supervision df/dt.
- MRG2 generator mains monitor / vector surge detection.
MRN3-11D
Product parameter
- Microprocessor technology with watchdog,
- digital filtering of the measured values by
- effective analog low pass filter for suppressing harmonics when measuring frequency and vector surge, using discrete Fourier analysis to suppress
- higher harmonics and d.c. components induced by faults or system operations,
- integrated functions for voltage, frequency and vector surge in one device as well as single voltage, frequency and vector surge devices,
- two parameter sets,
- voltage supervision each with two step under-/and overvoltage detection,
- frequency supervision with three step under-/or over frequency (user setting),
- completely independent time settings for voltage and frequency supervision,
- adjustable voltage threshold value for blocking frequency and vector surge measuring,
- display of all measuring values and setting parameters for normal operation as well as tripping via a alphanumerical display and LEDs,
- display of measuring values as primary quantities
- Storage of trip values and switching-off time (tCBFP) of 5 fault occurrences (fail-safe of voltage),
- recording of up to eight fault occurrences with time stamp
- for blocking the individual functions by the external blocking input, parameters can be set according to requirement,
- user configurable vector surge measurement 1-of-3 or 3-of-3,
- reliable vector surge measuring by exact calculation algorithm,
- suppression of indication after an activation (LED flash),
- free assignment for output relays,
- display of date and time,
- in compliance with VDE 0435, part 303 and IEC 255,
- serial data exchange via RS485 interface possible; alternatively with SEG RS485 Pro-Open Data Protocol or Modbus Protocol.
Application field
The MRN3 has a fault value recorder which records the measured analog values as instantaneous values.
The instantaneous values UL1; UL2; UL3 for star connection or U12; U23; U21 for delta connection are scanned at a raster of 1.25 ms (at 50 Hz) and 1.041 ms (at 60 Hz) and saved in a cyclic buffer.
It is possible to store 1 – 8 fault occurrences with a total recording time of 16 s (with 50 Hz) and 13.33 s (with 60 Hz) per channel.
Storage division
Independent of the recording time, the entire storage capacity can be divided into several cases of disturbance with a shorter recording time each. In addition, the deletion behavior of the fault recorder can be influenced.
No writing over
If 2, 4 or 8 recordings are chosen, the complete memory is divided into the relevant number of partial segments. If this max. number of fault event has been exceeded, the fault recorder block any further recordings in order to prevent that the stored data are written over. After the data have been read and deleted, the recorder to ready again for further action.
Please contact Sunny sales@xiongbagk.cn for the best price.
➱ sales manager: Sunny
➱ email mailto: sales@xiongbagk.cn
➱ Skype/WeChat: 18059884797
➱ phone/Whatsapp: + 86 18059884797
➱ QQ: 3095989363
➱ Website:www.sauldcs.com
