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C-EG44EM, February 2021

SIGMA 3

GROUND FAULT RELAY

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Summary of Contents for SIGMA 3

Page 1: ...C EG44EM February 2021 SIGMA 3 GROUND FAULT RELAY...

Page 2: ...omer service and technical leadership We build on this foundation by investing in developing new products in electrical safety education including EFC scholarship program by actively participating in...

Page 3: ...Relay Register Definitions Table 8 5 Relay Status Registers Table 8 6 MODBUS Register Format Conventions Table 10 1 NGR Test Values FIGURES Figure 3 1 Sigma 3 Typical System Diagram HRG System Figure...

Page 4: ...s to 3 15 seconds Neutral to ground voltage is measured by means of the NGRS The NGRS sensing resistor is used by the Sigma 3 monitor relay in combination with the zero sequence current sensor as part...

Page 5: ...See Figure 3 1 below for the typical system with the Sigma 3 connections For Low Resistance Grounded Systems LRG two high frequency injection channels HF1 and HF2 are employed See Figure 3 2 below for...

Page 6: ...m C contact energizes and the trip relays energize The Sigma 3 s NGR let through current setting is set by DIP switch to match the rating of the NGR The trip level is DIP switch selectable as a percen...

Page 7: ...this calculated value is determined to be over 150 of the nominal value or less than 66 of the nominal value the Sigma 3 annunciates an NGR fault 3 4 Pulsing Pulsing is a technique that is employed in...

Page 8: ...there is no fault condition present the trip relay is normally idle or energized The trip relay is tripped of de energized if a fault condition is detected on the system The trip relay is also de ene...

Page 9: ...ntermittently flash when the Sigma 3 is powered up after having been powered down while indicating a ground fault The Sigma 3 must be manually reset to clear this condition The Red GND FAULT LED will...

Page 10: ...trip if the control voltage is removed When control voltage is applied the trip relay will at first be de energized no trip and the Sigma monitor relay will start operating normally If the trip memor...

Page 11: ...liary fault relays are restored to the state these relays had prior to the loss of control power If the Sigma 3 was indicating a fault condition when control power was lost the states of the trip rela...

Page 12: ...ured for let through currents ranging from 1 Ampere through 4 Amperes using a standard I Gard TxA ZSCS with the conductor carrying the NGR current wrapped through the CT s primary window 10 times to...

Page 13: ...t immediately re trip Trip and Aux relays will re trip if a fault is detected after monitoring starts DOWN Table 6 2 Trip Memory Selection Dip Switch 2 Left hand array U Up D Down Ground Fault Trip Ti...

Page 14: ...lay Settings Dip Switches 3 4 5 6 7 left hand array Ground Fault Trip Level of NGR Let Through Current Dip Switch Settings 8 9 10 5 D D D 10 D D U 15 D U D 20 D U U 25 U D D 30 U D U 40 U U D 50 U U U...

Page 15: ...r Rx yA 15 D D D U D TxA or Rx yA 20 D D D U U TxA or Rx yA 25 D D U D D TxA or Rx yA 30 D D U D U TxA or Rx yA 35 D D U U D TxA or Rx yA 40 D D U U U TxA or Rx yA 45 D U D D D TxA or Rx yA 50 D U D D...

Page 16: ...3 TDM using its MODBUS communication The connection of the Sigma 3 to the Sigma3 TDM is shown in Figure 7 1 The Sigma3 TDM touchscreen HMI provides for display of the status and readings of the Sigma...

Page 17: ...ge is shown in Figure 7 5 below From here the Sigma Settings page can be accessed Select the system voltage i e L L voltage Pulse frequency can be selected Settings for the alarm annunciation can be s...

Page 18: ...16 Figure 7 3 Status Screen Figure 7 4 Event Log Page Figure 7 5 Settings Page...

Page 19: ...17 Figure 7 6 Sigma and Alarm Settings Page Figure 7 7 Pulse Contactor Settings Page Figure 7 8 Communications Settings Page...

Page 20: ...3 TDM This is through the Sigma3 TDM TCP IP communication port The protocol supported is MODBUS RTU The MODBUS I D number for the Sigma 3 is not programmable and is set according to the serial number...

Page 21: ...ver communications model or master slave communications model In the client server communications model the Sigma 3 is the MODBUS server and will respond to requests sent to it by a MODBUS client In t...

Page 22: ...Register contents are shown in Tables 8 4 to 8 6 as below NOTE Register number is shown in decimal but must be sent in hexadecimal form in the request The MODBUS register number is translated in the...

Page 23: ...5 The measurement of the let through current expressed as a percentage scaled to 0 1ffH of the set let through current nnnnH 40020 Register CTavg Nresv NGR1 NGR2 Pct1 Pct2 40040 40040 0000H Ctavg 0000...

Page 24: ...lay s three red LEDs is mapped to individual hexadecimal digits in MODBUS register 400031 as shown below 40031 0000H 0zng hex digit 0 g gnd fault led status 0 OFF 1 ON 2 FLASHING hex digit 1 n ngr fau...

Page 25: ...nals of the Sigma monitor relay must be as specified in the installation specifications These include the trip relay terminals the auxiliary fault relay terminals the external reset test and the G F m...

Page 26: ...bolts or self threading screws can be used to mount the 1 to NGRS 7 sensing resistor to a flat surface Refer to Figure 11 1 9 3 3 Connections The neutral terminal of the NGRS XX sensing resistor must...

Page 27: ...y or may not need to be performed 1 2 Calibration of the Sigma3 may need to be done if it is experiencing nuisance NGR faults or if it is failing to produce an NGR fault on the short circuit test or o...

Page 28: ...n in Figure 10 2 below 4 Set DIP switch 14 and 15 to ON with the rest of the DIP switches set to OFF 5 Wait for the FUNC LED to clear 6 Press RESET 7 Enter calibration mode by pressing TEST and RESET...

Page 29: ...in value 9 4 Continue to increase the most significant bit MSB until the meter goes to a little higher than 40 of full scale 9 5 Find the value at which the meter goes lower than 40 and produces an NG...

Page 30: ...28 Figure 10 2 b Example of DC Ammeter used in Calibration Procedure Figure 10 3 Partial Short on NGR when Performing Offline Calibration...

Page 31: ...hown in Figure 10 4 below or refer to the installation section of C EG44 EM 2 From the home page navigate to SETTINGS SIGMA ALARM SETTINGS and ensure that the system settings are correct for the appli...

Page 32: ...the value of Conductance Measurement Note this value as CM normal 5 Turn Calibration Mode to ON 6 Calculate and set the new Open Circuit Sensitivity Threshold as 70 CM normal 7 Calculate and set the...

Page 33: ...ductors are insulated 5 Disconnect the control power leads from the Sigma monitor relay and ensure these conductors are insulated 6 Connect short conductors between the L N and G terminals of the Sigm...

Page 34: ...AC 8A 24VDC 1 2 HP 240VAC Auxiliary NGR Fault Relay Type 1 Form C NO NC Rating 10A 240VAC 8A 24VDC 1 2 HP 240VAC All relays are electrically held and are de energized when control power if OFF Failsaf...

Page 35: ...neutral grounding device shall be a Continuously rated except when ground fault tripping is provided b Monitored so as to de energize the supply in less than 60s if the neutral grounding device opens...

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