Checking The Temperature Measurement Via Rtd-Box - Siemens SIPROTEC 7SJ62 Manual

Multi-functional protective relay with local control

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Checking the Temperature Measurement via RTD-Box

After the termination of the RS485 port and the setting of the bus address have been verified according to

Section 3.2, the measured temperature values and thresholds can be checked.

If temperature sensors are used with 2-phase connection you must first determine the line resistance for the

temperature detector being short-circuited. Select mode 6 at the RTD-Box and enter the resistance value you

have determined for the corresponding sensor (range: 0 to 50.6 Ω).

When using the preset 3-phase connection for the temperature detectors no further entry must be made.

For checking the measured temperature values, the temperature detectors are replaced by adjustable resistors

(e.g. precision resistance decade) and the correct assignment of the resistance value and the displayed tem-

perature for 2 or 3 temperature values from the following table are verified.

Temperature in °C

Temperature thresholds that are configured in the protection device can be checked by slowly approaching the

resistance value.

SIPROTEC, 7SJ62/64, Manual

C53000-G1140-C207-2, Release date 01.2008

Assignment of the resistance value and the temperature of the sensors

Temperature in °F

Ni 100 DIN 43760

Ni 120 DIN 34760

Mounting and Commissioning

3.3 Commissioning

Pt 100 IEC 60751