ABB RELION 670 Series Technical Manual page 1370

Section 23
Injection equipment hardware
Overvoltage reset
Stator module (SIM) and rotor module (RIM) injection outputs are protected against voltages
exceeding maximum operating range (10% of rated VT/DT for the stator and 75 % of max voltage
during gain dependent time for the rotor) by a relay blocking the injection circuit. This blocking is
controlled by measuring the sense voltage, and remains blocked by stored status in non-volatile
memory. Injection block is released by performing the following sequence:
1. Power off the REX060
2. Simultaneous press the C and key buttons
3. Power on the REX060 and wait until status indication Over-voltage is removed from display
Stator and rotor overvoltage protection of injection circuit
Both rotor and stator have two levels of protection, injection circuit interruption controlled by the
voltage sense input and a fuse for over-current protection. The voltage controlled interruption,
overvoltage, will normally occur prior to interruption by fuse and the reset sequence is described
above. A blown fuse requires module disassembling to replace the fuse (F 4 A 250 V for stator and
F 160 mA 250 V for rotor). However, if this occurs it is recommended to identify the reason for the
over-current and take necessary actions to reduce the current before restarting the unit. The
problem must be outside the injection unit since this unit cannot provide enough energy to blow
the fuse.
Saturation
When the voltage or current amplifiers in an injection module saturates due to high voltage level, it
is indicated with a warning symbol in the status column in the REX060 display . Besides this a
binary out for the specific module is set active to indicate to the IED that the signal may not be
reliable due to saturation and could cause incorrect measurements.
Binary in
The injection can be blocked by application in the IED. For this purpose, two binary inputs to the
REX060 exist:
• BLOCK on X61 terminal 1, 2 or 3: Prohibits injection on the injection unit inserted in X62
• BLOCK on X81 terminal 1, 2 or 3: Prohibits injection on the injection unit inserted in X82
The used terminal is depending on actual binary voltage, pin 1 for 220 V, 2 for 110 V, 3 for 48 V and
4 for return (common).
Binary out
The following binary outputs exist on the REX060:
• INJ_BLOCKED_NC on X61 terminal 5:
Indicates to the IED that the injection on X62 is blocked. The reason for blocking is indicated
in the REX060 LCD.
• SAT_NO on X61 pin 6:
Indicates to the IED that there is a risk of saturated amplifier on voltage and/or current
output at X61, indication is also given in the REX060 LCD.
• COMMON on X61 terminal 7:
Common return for X61 terminal 5 and 6
• INJ_BLOCKED_NC on X81 pin 5:
1364
1MRK 502 066-UUS B
Technical manual