Protection Relays Neutral-Grounding-Resistor Monitoring SE-330, SE-330HV SERIES Neutral-Grounding-Resistor Monitor Description The SE-330 is an advanced ground-fault and neutral-grounding- resistor monitoring relay that is compliant with Rule10-302 of the 2018 Canadian Electrical Code Part I (CE Code). It measures neutral current, neutral-to-ground voltage, and neutral-to-ground resistance. It provides continuous monitoring of the neutral-to-ground path to verify that the neutral-grounding resistor (NGR) is intact and that it has not been bypassed or shorted. An open NGR renders current- sensing ground-fault protection inoperative and could result in a false belief that the system is functioning properly. A shorted NGR results in higher-than-expected ground-fault current. The SE-330 can be used with low- and medium-voltage transformers and generators with low- or high-resistance grounding used in processing, manufacturing, chemical, pulp and paper, petroleum, and water-treatment facilities. For high-voltage applications, use the SE-330HV. For applications that require conformance to Australian standards, use the SE-330AU. Simplified Circuit Diagram Resistor Monitoring The SE-330 combines the measured values of resistance, current, and voltage to continuously determine that an NGR is intact. It is able to detect an open or shorted resistor with or without a ground fault present. Sensing resistors are matched to the system voltage CT B and are used to monitor NGRs on systems up to 72 kV. ER SERIES Ground-Fault Monitoring SE-330 SERIES (Sensing Resistor) The SE-330 uses an application-appropriate current transformer to (NGR Monitor) NGR A L1 reliably detect ground-fault currents as small as 100 mA. Discrete- L2 Fourier Transform (DFT) filtering ensures that false trips due to harmonic noise from adjustable-speed drives do not occur. Should For detailed wiring diagram, see adjacent page. the resistor open and a ground fault subsequently occur, the SE-330 will detect the fault through voltage measurement, while other Ordering Information current-only sensing relays would be ineffective. ORDERING POWER K4 UNIT HEALTHY COMM NUMBER SUPPLY CONTACT Pulsing Ground-Fault Location SE-330 - X X - 0 X The SE-330 is capable of controlling a pulsing contactor, which is used to switch the NGR resistance in a pulsing-compatible NGR 0=USB Only package. The resulting ground-fault current is distinguishable from 1=DeviceNet charging currents and noise and will only appear upstream of the 3=EtherNet ground fault, making fault location fast and easy, even without (Dual RJ45) SE-330 isolating feeders or interrupting loads. 4=EtherNet for applications (SC Fiber & RJ45) 0=120/240 0=Normally Open 35 kV or less Vac/Vdc 5=EtherNet Accessories (Dual SC Fiber) SE-330HV 1=Normally Closed 2=48 Vdc 6=IEC61850 for 72 kV ER Series Sensing Resistor A applications (Dual RJ45) Required interface between the power system and the 7=IEC61850 SE-330/SE-330HV. Eliminates hazardous voltage levels at (SC Fiber & RJ45) the relay. 8=IEC61850 (Dual SC Fiber) B ELCT5 Series Ground-Fault Current Transformer NOTE: For Australian applications, see the SE-330AU. Sensitive ground-fault current detection (5 A primary). ACCESSORIES REQUIREMENT ER Series Sensing Resistor Required ELCT30 Series Ground-Fault Current Transformer Sensitive ground-fault current detection (30 A primary). Current Transformer Required Other Current Transformer SE-IP65CVR-G Optional For low-resistance NGRs choose a CT primary SE-MRE-600 Optional approximately equal to the NGR rating. Inputs are provided for 1- and 5- A- secondary CTs. RK-332 Optional NGRM-ENC Optional SE-IP65CVR-G Hinged Transparent Cover PGA-0520 Optional Watertight cover, tamper resistant, IP65 protection. SE-330-SMA Optional Littelfuse reserves the right to make product changes, without notice. Material in this document is as accurate as known at the time of publication. Visit Littelfuse.com for the most up-to-date information. Rev: 4-D-042519 2019 Littelfuse Protection Relays & Controls 2018 Littelfuse Protection Relays & Controls Based on SE-330 Manual Rev: 11-A-063018 Littelfuse.com/se-330 Littelfuse.com/se-330hv Based on SE-330 HV Manual Rev: 5-M-101817Protection Relays Neutral-Grounding-Resistor Monitoring SE-330, SE-330HV SERIES Neutral-Grounding-Resistor Monitor Features & Benefits FEATURES IEEE BENEFITS Continuous NGR monitoring 3 Detects resistor failure within seconds, reduces transient-overvoltage risk, removes risk of ground-fault-detection failure Shorted NGR detection 3 Detects a ground fault on the neutral that could bypass the resistor, ensures fault current is not higher than expected Ground-fault detection 50G/N, 51G/N, 59N Main or backup protection to detect a ground fault anywhere on the monitored system Adjustable pickup (2-100%) Select greatest sensitivity without false operation, adjustable in 1% increments (MEM setting) Adjustable time delay (0.1 - 10 s) Adjustable trip delay allows quick protection and system coordination Universal CT compatibility Allows the use of a CT that gives required ground-fault settings Programmable output contacts Two programmable Form C and One programmable Form A (Ground Fault, Resistor Fault, Unit Health) Selectable contact Selectable fail-safe or non-fail-safe operating modes allows connection to shunt or undervoltage breaker operating mode coil or alarm circuit (K1, K2, and K3 output contacts) Analog output (4 - 20 mA) Connect an optional PGA-0520 meter or control system Pulsing output (SE-330 only) Control the operation of a pulsing ground-fault-location circuit Trip records On-board 100-event (with date and time) recorder helps with system diagnostics Harmonic filtering (DFT) Eliminate false trips due to harmonic noise from ASDs Local communications Mini USB port to view measured values, configure settings, and check event records Data logging On-board microSD card (included) can be used for long-term data logging Remotely view measured values and event records, reset trips, and cause a remote trip Available Protocol Options: IEC 61850 - with dual RJ45, SC Fiber and RJ45, or Dual SC Fiber Interface Network communications Modbus TCP and Ethernet/IP - with dual RJ45, SC Fiber and RJ45, or Dual SC Fiber Interface DeviceNet - with CAN interface Software PC-interface software (SE-MON330) is available at Littelfuse.com/RelaySoftware Selectable reset mode Selectable latching or auto-reset operation Unit-healthy output Verifies SE-330 is operating correctly, available as Form A or Form B output contact Conformal coating Internal circuits are conformally coated to protect against corrosion and moisture Typical Values NEUTRAL-GROUNDING RESISTOR SENSING RESISTOR GROUND-FAULT SYSTEM VOLTAGE V PICKUP LEVEL N PICKUP LEVEL CURRENT RESISTANCE RESISTANCE (VOLTS) (VOLTS) MODEL (AMPERES) (AMPERES) (OHMS) (SWITCH S5 SETTING) 480 5 55 ER-600VC 20 k 2.5 170 600 5 69 ER-600VC 20 k 2.5 200 2,400 5 277 ER-5KV 20 k 2.5 800 4,160 5 480 ER-5KV 20 k 3 1,700 7,200 10 416 ER-15KV 100 k 2 170 x 5 = 850 14,400 15 554 ER-15KV 100 k 3 340 x 5 = 1,700 DISCLAIMER: The above table is for illustrative purposes only. Actual values may differ based on a variety of individual system considerations, such as capacitive charging current and coordination study results. Specifications Wiring Diagram IEEE Device Numbers Ground Fault (50G/N, 51G/N, 59N), Checking Relay (3), Lockout Relay (86) 12 1 UNIT Input Voltage See ordering information CONTROL HEALTHY 13 POWER 2 Dimensions H 213 mm (8.4 ) W 98 mm (3.9 ) D 132 mm (5.2 ) RESET 3 GF Trip-Level Settings 2-100% of CT-Primary Rating in 1% increments POWER SYSTEM 15 NEUTRAL (X0) GF Trip-Time Settings 0.1-10 s 16 NEUTRAL-GROUNDING- 17 Vn Trip-Level Settings 20-2,000 Vac (5 kV systems) 100-10,000 Vac (>5 kV systems) RESISTOR MONITOR SENSING RESISTOR PULSE SE-330 SERIES (SE-330 ONLY) ER SERIES ENABLE Contact Operating Mode Selectable fail-safe or non-fail-safe (K1, K2, K3) +24 Vdc 18 ANALOG + 19 Harmonic Filtering Standard feature (required) OUTPUT N R 6 R 20 4-20 mA Reset Button Standard feature 7 G 21 0 V A G Output Contacts Two Form A and two Form C 22 Pulsing Circuit 1.0-3.0 s in 0.2 s increments (SE-330 only) TRIP OR PULSING 23 Approvals CSA certiefi d, UL Listed (E340889), CE (European Union), RCM (Australian) (K1) CURRENT TRANSFORMER EFCT FAMILY Communications Mini USB (standard) DeviceNet (optional), IEC 61850 (optional), 24 8 EFCT GROUND Modbus TCP and EtherNet/IP (optional) 25 9 1 A FAULT (required) (K2) 26 10 5 A Analog Output 4-20 mA, self or loop powered B 11 COMMON 27 Conformally Coated Standard feature RESISTOR 28 FAULT Warranty 5 years (K3) 29 Mounting Panel and Surface (optional) Littelfuse reserves the right to make product changes, without notice. Material in this document is as accurate as known at the time of publication. Visit Littelfuse.com for the most up-to-date information. Rev: 4-D-042519 2018 Littelfuse Protection Relays & Controls 2018 Littelfuse Protection Relays & Controls Based on SE-330 Manual Rev: 11-A-063018 Littelfuse.com/se-330 Littelfuse.com/se-330hv Based on SE-330 HV Manual Rev: 5-M-101817