English
简体中文
News
Get to know our latest news
GE Multilin MIV II series
Source: | Author:kongjiang | Published time: 2026-09-20 | 27 Views | 🔊 Click to read aloud ❚❚ ▶ | Share:
The MIV II, a member of the M II Family, is a digital device that provides voltage and frequency protection for a wide range of applications at any voltage level. Specialized Protection & Control NOTE: The MIV II includes four independent time delayed phase under/overvoltage elements, and two independent fixed time ground overvoltage elements, the MIV II 2000 includes frequency functions (four units), and the MIV II 3000 includes both voltage and frequency (two) units.
MIV II DIGITAL VOLTAGE AND FREQUENCy RELAy
Economical voltage and/or Frequency protection for motors, generators, automatic transfer systems, lines and busbars.
KEy BENEFITS
• Reduce troubleshooting and maintenance cost - event recording, and analogy/digital oscillography
• Design Flexibility - easy to use programming logic
• Access to information - Modbus RTU® communications
• Configurable logic, curves, digital I/Os, and LEDs
• Flash memory for field upgrades
• Two settings groups
• Password protection for local operation APPLICATIONS
• Automatic display of last fault information
• Three models available for voltage, frequency and combined protection
• AC/DC power supply
• Access via front panel keypad or communication links
• EnerVistaTM compatible
• Isolated RS232 port
APPLICATIONS
• Voltage and/or frequency protection at any voltage in automatic transfer systems, generators, motors, lines and busbars
FEATURES
Protection and Control
• Three-phase over and undervoltage, ground overvoltage
• Voltage unbalance, over and underfrequency, with the following options:
- Four independent time delay phase under/overvoltage elements complete with two independent fixed time ground overvoltage elements Four units of frequency protection Both voltage protection and two elements of frequency protection
• Circuit Breaker control (open/close)
• Configurable I/O
• 6 outputs, four configurable, plus trip and alarm
Monitoring and Metering
24-event record
• Analog/digital oscillography - 24 cycles at 8 samples per cycle
• Frequency and per-phase voltage
• Monitoring of the last 5 trips information from the display User Interfaces
• 2x16 character LCD display
• 6 LED indicators, 4 configurable in function and color
• Front RS232 and rear RS485 ports using ModBus® RTU protocol up to 19,200 bps
• EnerVistaTM software - an industry leading suite of software tools that simplifies every aspect of working with GE Multilin devices
Overview
The MIV II, a member of the M II Family, is a digital device that provides voltage and frequency protection for a wide range of applications at any voltage level. Specialized Protection & Control NOTE: The MIV II includes four independent time delayed phase under/overvoltage elements, and two independent fixed time ground overvoltage elements, the MIV II 2000 includes frequency functions (four units), and the MIV II 3000 includes both voltage and frequency (two) units. The basic MIV II has two fixed digital inputs and six fixed digital outputs. An option is provided allowing the two inputs and four of the outputs to be user configurable. The basic MIV II has six fixed status LEDs. An option is provided allowing four of these LEDs to be user configurable. The front panel also features a 5-button keypad and a 16x2 LCD display that provides an easy to use user interface. The front keypad allows the user to set the baud rate and relay address for communication. A front RS232 and a rear RS485 communication port are provided for computer access using ModBus® RTU protocol. The rear RS485 can be converted to an RS232 or fiber optic port (plastic or glass fiber optics) by means of using an external converter, such as GE Multilin DAC300 or F485. Windows® based EnerVistaTM software is provided free of charge with the relay to allow setup and configuration of MIV units. Computer access allows setting and configuration (inputs, outputs, LEDs and configurable logic) of the units, display of metering information and real time status of the unit. An option is provided allowing the display of event records and an oscillography record for the last fault. The MIVII has a drawout construction in 1/4 of a 19’’ rack case.
Protection
Phase Under/Overvoltage
Four independent time delayed under/ overvoltage elements. Each of them can be enabled and set independently, with a pickup range from 2 to 60 V or 10 to 250 V, depending on the selected model, and a time delay range from 0 to 600 seconds. The protection elements can operate either on phase-to-phase or phase-to-ground voltage magnitudes. To avoid permanent undervoltage tripping whenever a breaker is open and the VTs are located on the line side, a separate setting is provided to enable/disable undervoltage protection elements when a breaker is open.
Ground Overvoltage
Two independent fixed time ground overvoltage elements. Each of them can be enabled and set independently, both for pickup voltage and timing.
The pickup setpoint range is from 2 to 60V or from 10 to 250 V, depending on the selected model, and a time delay range from 0 to 600 seconds.
Voltage Unbalance
This function operates on negative sequence voltage, and is included in the MIV II 3000 relay. Pickup and time delay settings are the same as those of voltage functions.
Frequency Functions
Depending on the model, either two or four independent definite time frequency units are provided. Each unit can be independently set as over and underfrequency, and is supervised by an independently adjustable undervoltage element.
Metering
MIV II provides metering values for phase and ground voltages. The accuracy is 3% in the complete range, and 1% at the rated voltage.
Primary or Secondary Metering
The MIV II can monitor both the primary and secondary voltage metering values, by previously setting the corresponding CT ratio.
Event Recording
Events consist of a broad range of change of state occurrences, including pickups, trips, contact operations, alarms and self test status. The MIV II stores up to 24 events time tagged to the nearest millisecond. This provides the information needed to determine sequence of events which facilitates diagnosis of relay operation. Each event is individually maskable in order to avoid the generation of undesired events, and includes the voltage values and status of all the protection elements at the moment of the event.
Oscillography (MIV II 1000 and 3000)
MIV II captures current waveforms and digital channels at 8 samples per cycle. One oscillography record with a maximum length of 24 cycles is stored in memory. Oscillography is triggered either by internal signals or an external contact.
Oscillography (MIV II 2000)
MIV II 2000 stores an oscillography record, with a resolution of 2 samples per cycle and a length of 432 cycles. Oscillography is triggered either by internal signals or an external contact.
Configurable I/O and LEDs
Two digital inputs are user configurable. Out of the six digital outputs incorporated, two have a fixed function (trip and service required), while the other four are user programmable. Those configurable outputs can be assigned either to a set of pre-configured values, or an OR/NOT combination of the same values. Each configurable output can be independently latched, and individually selected as NO or NC by means of a jumper.
Outputs 1 and 2 can be isolated from outputs 3 and 4 by removing jumperJX. Four of the 6 LED indicators can also be programmed by the user. The first LED has a fixed assignment (relay in service), the second is fixed for trip, and the remaining four LEDs are configurable in function, memory and color (red or green).
Configurable Logic
Up to a maximum of 4 configurable logic schemes can be implemented into the MIV II by means of using a set of 4 pre configured logic gates and timer cells. A graphical user interface is provided for configuration of MIV II logic. The outputs of the MIV II configurable logic can be assigned to contact outputs and/or LEDs.
Circuit Breaker Control
The MIV II permits operation of the circuit breaker. Breaker opening and closing operations can be carried out by programming specific outputs, and digital inputs can be used for verifying the success of the operation.
MIV II 1000
MIV II 2000

MIV II 3000