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Littelfuse SE-330 Manual

Neutral-grounding-resistor monitor
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Tel: +1-800-832-3873
E-mail: techline@littelfuse.com
www.littelfuse.com/SE-330
SE-330 MANUAL
NEUTRAL-GROUNDING-RESISTOR MONITOR
REVISION 10-P-101817
Copyright Ó 2017 Littelfuse Startco
All rights reserved.
Document Number: PM-1200-EN
Printed in Canada.

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Summary of Contents for Littelfuse SE-330

  • Page 1 Tel: +1-800-832-3873 E-mail: techline@littelfuse.com www.littelfuse.com/SE-330 SE-330 MANUAL NEUTRAL-GROUNDING-RESISTOR MONITOR REVISION 10-P-101817 Copyright Ó 2017 Littelfuse Startco All rights reserved. Document Number: PM-1200-EN Printed in Canada.
  • Page 2 Page i SE-330 Neutral-Grounding-Resistor Monitor Rev. 10-P-101817 This page intentionally left blank.

  • Page 3: Table Of Contents

    9.3 Analog-Output Test ..........34 General ..............1 9.4 Ground-Fault Performance Test ......35 1.1 Modern Resistance-Grounded Systems ....1 Appendix A SE-330 Revision History ......36 1.2 SE-330 NGR Monitoring ........1 Operation .............. 2 2.1 Settings ..............2...
  • Page 4 Page iii SE-330 Neutral-Grounding-Resistor Monitor Rev. 10-P-101817 This page intentionally left blank.

  • Page 5: General

    The NGR selection depends on system charging current and components required to monitor an NGR are an SE-330, a whether the system is an alarm-only or a tripping system. 20- or 100-kW ER-series sensing resistor, and a current Alarm-only systems are usually restricted to system transformer (CT).

  • Page 6: Operation

    5% of the CT rating, the 2. O PERATION SE-330 will trip on resistor fault. If the resistor-fault circuit is tripped and the neutral voltage exceeds the V TRIP 2.1 S...

  • Page 7: Pulse-Period Adjustment

    DJUSTMENT Pulse period is the cycle time of relay K1 when the SE-330 is configured for pulsing operation. Pulse period is adjustable from 1.0 to 3.0 seconds with a fixed duty cycle of 50%. For example, with the 1.0-s setting, relay K1 will alternately be energized for 0.5 seconds and de-...

  • Page 8: Relay K1 Function (S1)

    AULT ATCH (S3) Set switch S3 to select latching or non-latching ground- : If the SE-330 is not calibrated and is supplied fault-circuit operation. Non-latching operation defeats from the load side of the breaker (non-fail-safe mode), ground-fault-trip memory. See Sections 2.1.5.2 and 2.4.

  • Page 9: Pulsing Operation

    See Section 2.8. When supply voltage is applied with switch S2 set to FAIL-SAFE, the SE-330 returns to its state prior to loss of supply voltage unless switch S3 or S4 is set to non- latching. When supply voltage is applied with switch S2 set to NON-FAIL-SAFE, SE-330 trips are reset.

  • Page 10: Analog Output

    24-Vdc supply allows the analog output to be connected as a self-powered output. Power from an shown in Fig. 4. To panel mount the SE-330, insert it external supply is required for loop-powered operation. through the panel cutout and secure it with the four See Fig.

  • Page 11: Se-330 Connection Diagram

    Page 7 SE-330 Neutral-Grounding-Resistor Monitor Rev. 10-P-101817 FIGURE 3. SE-330 Connection Diagram.

  • Page 12: Se-330 Outline And Panel-Mounting Details

    Page 8 SE-330 Neutral-Grounding-Resistor Monitor Rev. 10-P-101817 FIGURE 4. SE-330 Outline and Panel-Mounting Details.

  • Page 13: Se-330 Outline And Surface-Mounting Details

    Page 9 SE-330 Neutral-Grounding-Resistor Monitor Rev. 10-P-101817 FIGURE 5. SE-330 Outline and Surface-Mounting Details.

  • Page 14: Se-Ip65Cvr-G Weatherproof Cover Outline

    Page 10 SE-330 Neutral-Grounding-Resistor Monitor Rev. 10-P-101817 FIGURE 6. SE-IP65CVR-G Weatherproof Cover Outline.
  • Page 15 Page 11 SE-330 Neutral-Grounding-Resistor Monitor Rev. 10-P-101817 FIGURE 7. SE-IP65CVR-G Weatherproof Cover Installation.

  • Page 16: Sensing Resistor

    The ER-15KV, ER-25KV, and ER-35KV Sensing-resistor terminal R and its connection to SE-330 include moisture-resistant terminal covers. Use suitable terminal R, including interposing terminal blocks, must water-tight fittings. Ground sensing-resistor terminal G.
  • Page 17 Page 13 SE-330 Neutral-Grounding-Resistor Monitor Rev. 10-P-101817 FIGURE 9. SE-MRE-600 Moisture-Resistant Enclosure Outline.

  • Page 18: Se-Mre-600 Moisture-Resistant Enclosure Outline 13 10 Er-600Vc Installed In Se-Mre-600

    Page 14 SE-330 Neutral-Grounding-Resistor Monitor Rev. 10-P-101817 FIGURE 10. ER-600VC Installed in SE-MRE-600.

  • Page 19: Er-5Kv Sensing Resistor

    Page 15 SE-330 Neutral-Grounding-Resistor Monitor Rev. 10-P-101817 FIGURE 11. ER-5KV Sensing Resistor.

  • Page 20: Er-5Wp Sensing Resistor

    Page 16 SE-330 Neutral-Grounding-Resistor Monitor Rev. 10-P-101817 FIGURE 12. ER-5WP Sensing Resistor.

  • Page 21: Er-15Kv Sensing Resistor

    Page 17 SE-330 Neutral-Grounding-Resistor Monitor Rev. 10-P-101817 FIGURE 13. ER-15KV Sensing Resistor.

  • Page 22: Er-25Kv Sensing Resistor

    Page 18 SE-330 Neutral-Grounding-Resistor Monitor Rev. 10-P-101817 FIGURE 14. ER-25KV Sensing Resistor.

  • Page 23: Er-35Kv Sensing Resistor

    Page 19 SE-330 Neutral-Grounding-Resistor Monitor Rev. 10-P-101817 FIGURE 15. ER-35KV Sensing Resistor.

  • Page 24: Ground-Fault Ct

    CT-primary rating. See Section 9.4. Littelfuse Startco current sensors are designed for use at low levels and respond linearly to 2% current rating. The current-sensor insulation class is of no consequence if its secondary is grounded and the conductors through its window are insulated for the system voltage.

  • Page 25: Efct-1 Ground-Fault Current Sensor

    Page 21 SE-330 Neutral-Grounding-Resistor Monitor Rev. 10-P-101817 FIGURE 16. EFCT-1 Ground-Fault Current Sensor.

  • Page 26: Se-Cs30-70 Ground-Fault Current Sensor

    Page 22 SE-330 Neutral-Grounding-Resistor Monitor Rev. 10-P-101817 FIGURE 17. SE-CS30-70 Ground-Fault Current Sensor.

  • Page 27: Efct-26 And Se-Cs30-26 Ground-Fault Current Sensors

    Page 23 SE-330 Neutral-Grounding-Resistor Monitor Rev. 10-P-101817 FIGURE 18. EFCT-26 and SE-CS30-26 Ground-Fault Current Sensors.

  • Page 28: Rk-332 Remote Indication And Reset

    Page 24 SE-330 Neutral-Grounding-Resistor Monitor Rev. 10-P-101817 FIGURE 19. RK-332 Remote Indication and Reset. FIGURE 20. PGA-0520 Analog Percent Current Meter.

  • Page 29: Isolated Ground Connection

    An isolated ground bed can prevent a ground potential rise (GPR) from being transferred to remote equipment. If the G terminals on the sensing resistor and the SE-330 are connected to an isolated ground, the SE-330 will be exposed to the GPR. If the GPR is greater than the...

  • Page 30: Data Interfaces

    Use the SE-MON330 software (version 3.8 or newer) to access set-points, measured values, and trip records through : SD card usage is intended for use with the SE-330 the mini B USB interface located on the front panel. The only. Do not store other data on the SD card – files may be following data can be viewed: automatically deleted.

  • Page 31: Troubleshooting

    : No Change, RF LED : ON, K1:Trip Remote Trip 1 L - 2 S - 1 L The SE-330 was tripped by a signal from network communications. DIAGNOSTIC LED flash code Press RESET to clear the trip. Critical diagnostic code.
  • Page 32 : No Change, RF LED : No Change, K1:No Change DIAGNOSTIC LED = Solid Red SE-330 processor failed to start. Cycle supply. If problem persists, consult Littelfuse Startco. K1: De-energized. Pressing RESET does not clear trips. Trip condition is still present. Locate and correct.

  • Page 33: Technical Specifications

    Page 29 SE-330 Neutral-Grounding-Resistor Monitor Rev. 10-P-101817 6. T ECHNICAL PECIFICATIONS Trip-Level Accuracy ..... Maximum of 1% of CT- Primary Rating or 3% of 6.1 SE-330 Setting Supply: Trip-Time Accuracy ....10% of Setting, 20 ms Option 0 ....... 30 VA, 120 to 240 Vac minimum (+10, -45%), 50/60 Hz;...
  • Page 34 Page 30 SE-330 Neutral-Grounding-Resistor Monitor Rev. 10-P-101817 ac ........2,000 VA resistive, 1,500 Mounting Configurations .... Panel Mount and Optional VA inductive (PF = 0.4) Surface Mount Dimensions: Subject to maximums of 8 A at 250 Vac, 8 A resistive Height ........

  • Page 35: Sensing Resistors

    Page 31 SE-330 Neutral-Grounding-Resistor Monitor Rev. 10-P-101817 microSD™ and microSDHC™ are trademarks of Magnetic Field SD-3C, LLC. Immunity ......IEC 61000-4-8 Remote-reset and pulse-enable wiring is limited to 50 Hz and 60 Hz 10 m (32’). 30 A/m and 300 A/m This value can only be modified using SE-MON330 software.

  • Page 36: Current Sensors

    Certifications ....... CSA, UL, CE Compliance ......RoHS, IEC 60044-1 CE, European Union Extended Operating Temperature ......-55 to 60°C (-67 to NOTES: 140°F) Electrical specifications have been verified at a Littelfuse lab. CT200: Current Ratio ....... 200:5 A 6.3 C URRENT ENSORS Insulation ......

  • Page 37: Ordering Information

    300-A-primary rating, 64-mm (2.5”) window 7SHT-401-E ......Current Sensor, 400-A-primary rating, 64-mm (2.5”) window Please refer to the SE-330 Product Change Notice OTE: Accessories: (PCN) document for updated ordering information and new RK-332 ........Remote Indication and revision details, available at www.littelfuse.com/se-330.

  • Page 38: Warranty

    Applying the test voltage to the R and G terminals purchase. OTE: will damage the SE-330 and the ER sensing resistor. The V Littelfuse Startco will (at Littelfuse Startco’s option) TRIP LEVEL is the trip voltage at terminal N, not terminal R.

  • Page 39: Ground-Fault Performance Test

    This check can be done visually with knowledge of the circuit. connection of the current-sensor secondary to the SE-330 is not polarity sensitive. c) Verify that the system is correctly grounded and that alternate ground paths do not exist that bypass the current sensor.

  • Page 40: Appendix A Se-330 Revision History

    Page 36 SE-330 Neutral-Grounding-Resistor Monitor Rev. 10-P-101817 APPENDIX A SE-330 REVISION HISTORY HARDWARE REVISION MANUAL MANUAL (REVISION NUMBER FIRMWARE REVISION RELEASE DATE REVISION ON PRODUCT LABEL) October 18, 2017 10-P-101817 2.60 December 7, 2016 10-N-120716 2.55 2.54 September 21, 2016 10-M-092116 2.53...
  • Page 41 Page 37 SE-330 Neutral-Grounding-Resistor Monitor Rev. 10-P-101817 10-K-090815 EVISION ECTION Section 4.1.2 updated. ECTION SD card diagnostic troubleshooting updated. 10-J-062215 EVISION ECTION Section 2.1.7 added. ECTION SD Card approximate yearly data logging usage updated. SE-MON330 software version updated. ECTION Resistor-fault trip level ranges added.
  • Page 42 ARDWARE EVISION Update to RTC circuit. ARDWARE EVISION Updated SE-330 platform to include USB and microSD™ interfaces, programmable trip level (MEM) feature, and ability to add future options. Real-time clock added. Added dual cable and fiber Ethernet ports. IRMWARE EVISION ISTORY 2.60...
  • Page 43 Page 39 SE-330 Neutral-Grounding-Resistor Monitor Rev. 10-P-101817 2.53 IRMWARE EVISION Fixed NAND FLASH bit error correction code to prevent solid-red diagnostic error. 2.52 IRMWARE EVISION Improved compatibility with Internet Explorer™ web browser. 2.50 IRMWARE EVISION Added support for adjustable resistor-fault trip level.
  • Page 44 Page 40 SE-330 Neutral-Grounding-Resistor Monitor Rev. 10-P-101817 This page intentionally left blank...

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