Date Code 20011026 Maintenance and Testing 7-1
SEL-321/321-1 Instruction Manual
SECTION 7: MAINTENANCE AND TESTING
INTRODUCTION
This section contains the following items:
• Initial Checkout Procedure
• SEL Relay Testing Philosophy
• Test Methods and Tools
• Test Procedures for overcurrent, directional, and distance elements
• Relay Test and Operation Troubleshooting Guides
• Firmware Upgrade Installation Procedures
INITIAL CHECKOUT
The initial checkout procedure should familiarize you with the relay. Study Functional
Specifications and Descriptions in Section 2: Specifications, Command Descriptions in
Section 3: Communications, Section 4: Event Reporting, and Section 5: Applications for a
complete understanding of the relay capabilities.
Equipment Required
The following equipment is necessary for initial checkout.
1. Source of control power.
2. Source of three-phase voltages and at least two currents.
3. Ohmmeter or contact opening/closing sensing device.
Checkout Procedure
Step 1.
Purpose: Be sure you received the relay in satisfactory condition.
Method: Inspect the instrument for physical damage such as dents or rattles.
Step 2.
Purpose: Refer to the Relay Part Number and Hardware Identification Sticker on the
relay rear panel to verify the power supply voltage, dc control voltage, and nominal
ac signal magnitudes appropriate for the relay under test.
Method: Refer to the information sticker on the rear panel of the relay. Figure 7.1
provides an example. Information on this sticker is important to note before
applying power to the relay or starting tests.
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