Hardware Description; Physical Description; Case; Electrical Connections - GE MOV 2000 Instructions Manual

5. 5. 5. 5.
The MOV contains electronic components that could be damaged by electrostatic
discharge if those currents flow through certain terminals of the components. The
main source of electrostatic discharge currents is the human body, especially in
conditions of low humidity, carpeted floors and isolating shoes. Where these
conditions exist, care should be exercised when removing and handling the modules.
The persons handling the modules should make sure that their body charge has been
discharged, by touching some surface at ground potential before touching any of the
components on the modules.

5.1. PHYSICAL DESCRIPTION

The MOV case is made from stainless steel and consists of the main body and a covering lid. The main body of
the case contains the blocks of terminals necessary to carry out the external connections and guides to support
the trays which contain the internal parts of the relay. The trays can be pulled out in order to facilitate the
maintenance and servicing of the relay.
All the electrical connections for voltage, current, digital input and output relays are made using the blocks of
terminals fixed to the rear part of the case. The connections required for the unit's communications are made
using three DB-9 type connectors, one on the front and two on the rear when using communication option RS-232.
One of these connectors is replaced by the corresponding fibre-optic connector in the models which include this
option.
Internally the MOV unit is divided into 2 trays and a case. The case consists of the case with the blocks of
terminals described above. Inside the lower tray are located the CT and VT which are connected to the CPU by a
frontal bus.
The lower tray carries the magnetic module and a printed circuit board which contains the power supply, the digital
inputs and also the trip outputs and auxiliary outputs.
The upper tray carries the board with the protection system CPU and the board with the communications. This tray
can also carry as an option the output expansion board.
The front panel consists of a covered keyboard and a board which carries the alphanumeric display, the LEDs and
the Reset button. The model number (see list of models in Chapter 4) and the technical characteristics of the unit
are situated on the front panel of the relay.
The 16 indicator LEDs can be identified using labels which can be placed beside them.
A frontal bus is responsible for the connections between the boards described above. Both trays can be pulled
out. To do so you first have to release the front panel which is fixed to the case with two screws and pull it out,
removing the flat cable which connects it to the CPU. It is then possible to remove the frontal bus.
GEK-106271
CAUTION
MIV Digital Multifunctional Protective Relay

5. HARDWARE DESCRIPTION

HARDWARE DESCRIPTION HARDWARE DESCRIPTION
HARDWARE DESCRIPTION HARDWARE DESCRIPTION

5.1.2. ELECTRICAL CONNECTIONS

5.1.3. INTERNAL CONSTRUCTION

5.1.1. CASE

35