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The relay has 2 serial gates and three connectors. Gate 1 can be reached from the front of the relay in connector 1
(PORT 1 connector) or from the rear (PORT 2 connector). The second gate can be reached from connector 3 (PORT
3 connector) which is located on the rear.
There are different models each with a different physical connection for the PORT 3 connector (RS3232 or fiber-
optic). In the "RS232" models the three connectors are RS232. In the "RS232 and fiber-optic" models the PORT1 and
PORT2 connectors are RS232 while the PORT3 connector is replaced by a fiber-optic connector.
The PORT 1 connector has priority over the PORT 2 connector and is selected when the DCD (Data Carrier Detect)
signal is activated. Fig8 shows how to make the connections to a personal computer.
The communications protocol is the same as that used for the rest of the GE digital protection systems and requires
the use of the GE_LOCAL software. The protocol is reliable and allows communication with different protection
systems. It guarantees very efficient data transfer (especially for large files) along with error detection and automatic
communication recovery.
The status of the local/remote communication is indicated on the front of the unit by LED indicator 16 (in default
configuration). Local communication refers to communication via the keyboard/display (local display showing any
information except for the initial DTR GENERAL ELECTRIC), or via communication gate 1 (PORT 1), and remote
communication refers to connection via gate 1 (PORT 2) or gate 2 (PORT 3).
Local and remote communications can exit at the same time, although there is only one possibility for changing
settings and carrying out operations, since this can only be done with the communication which has priority (local
communication) while the other is limited only to accessing information. When the local communication is interrupted,
either by the disconnection of PORT 1 connector or because the HMI is on the initial screen (a situation which can be
caused intentionally, or automatically if no key has been pressed for 15 minutes), the remote communication
recovers the ability to modify and carry out operations.
The GE_NESIS software include five different programs, each one with a different function:
GE-LOCAL.
GE-INTRO.
GE-POWER.
GE-CONF.
The GE_Local and GE_Intro programs constitute the basic communication and configuration software for DTR
systems, allowing the communication with one device at one time, either for level 1 devices integrated in a system or
for non integrated devices (operating as individual relays).
GEK-106305A
2. OPERATION PRINCIPLES
Level 1 communication software.
Level 1 configuration software.
Level 2 communication software.
Level 2 configuration software.
DTR Digital Tap Changer Controller
2.5.2 REMOTE COMMUNICATIONS. SOFTWARE
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