701 Motor Protection Relay
Date Code 20010719
Installation
Relay Connections
2.10
Relay Connections
!
DANGER:
Contact with instrument terminals may cause
electrical shock which can result in injury or death.
Input Power Connections
The SEL-701 Relay power supply has a broad operating range that can accept
ac or dc inputs.
Power Supply Operating Range:
95–240 ±10% Vac 50/60 Hz.
20–250 ±20% Vdc.
<15 VA, typical.
The relay power supply is fused internally. If the fuse operates, make sure that the
cause of the fuse operation has been isolated and corrected before replacing the fuse
and returning the relay to service. See
Section 10: Maintenance & Troubleshooting
for
instructions on how to replace the power supply fuse.
Replacement Power Supply Fuse Ratings: T 2 A/250 V, high breaking capacity.
Relay Chassis Ground Connection
Terminals D01 and D10 are the chassis ground terminals. At least one of these
terminals must be solidly connected to the cabinet ground bus for correct relay
operation and personal safety.
Current Transformer Inputs
The SEL-701 Relay is equipped with four current transformer inputs: IA, IB, IC,
and IN. Each input can accept either 1 A nominal or 5 A nominal CT secondary inputs.
The relay sequence current and power measurements are sensitive to the polarity
of current applied to the relay. Make sure that the current connections observe the
polarity markings shown in
and
Connect the CT nonpolarity lead to the COM CT terminal. Connect the CT polarity
lead to the 5 A or 1 A input, depending on the secondary rating of the CT.
Select the phase CT ratios so that the motor full load current is greater than 50%
of the CT primary rating.
EXAMPLE 2.1
Phase CT Ratio Selection
A 200 HP, 575 V, three-phase motor draws 192 A at full load. Use
one of the following CT ratios:
200:5.
250:5.
300:5.
Содержание SEL-701
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