SE-701 MANUAL GROUND-FAULT MONITOR

Transcription

1 SE-701 MANUAL GROUND-FAULT MONITOR DECEMBER 19, 2000 REVISION 4 Copyright 2000 by Startco Engineering Ltd. All rights reserved. Publication: SE-701-M Document: S95-C Printed in Canada.

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3 Startco Engineering Ltd. Page i TABLE OF CONTENTS PAGE Table of Contents...i List of Figures...i 1. General Operation Configuration-Switch Settings Relay Operating Mode Inhibit CT Verification Filter Selection Autoreset Front-Panel Controls Ground-Fault Trip Level Ground-Fault Trip Time Reset Test Front-Panel Indication Power Ground-Fault Trip Inhibit Analog Output...3 FIGURE LIST OF FIGURES PAGE 1 SE-701 Outline and Mounting Details Typical Connection Diagram EFCT-1 Outline and Mounting Details EFCT-2 Outline and Mounting Details PMA-55 Panel-Mount Adapter... 8 DISCLAIMER Specifications are subject to change without notice. Startco Engineering Ltd. is not liable for contingent or consequential damages, or for expenses sustained as a result of incorrect application, incorrect adjustment, or a malfunction. 3. Installation Technical Specifications Ordering Information...5

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5 Startco Engineering Ltd. Page 1 1. GENERAL The SE-701 is a microprocessor-based ground-fault monitor for resistance-grounded and solidly grounded systems. Its output relay can operate in the fail-safe or nonfail-safe mode for undervoltage or shunt-trip applications, and the output contacts are isolated for use in independent control circuits. Additional features include LED and fluorescent-flag trip indication, autoreset or latching trips with front-panel and remote reset, self test, 0 to 5-V analog output, inputs for standard and sensitive ground-fault current transformers, CT verification for sensitive current transformers, digital selector switches, switch-selectable algorithms for fixed-frequency or variable-frequency applications, and an inhibit that can be enabled to prevent the output relay from operating during a high-current ground fault. Ground-fault current is sensed by a standard CT with a 1-A or 5-A secondary, or by a sensitive CT with a 5-Aprimary rating (EFCT-1 or EFCT-2). The trip level of the ground-fault circuit is digital-switch selectable in 1% increments from 1% to 99% of the CT-primary rating. Trip time is digital-switch selectable with 10 settings from 0.05 to 2.5 s. 2. OPERATION 2.1 CONFIGURATION-SWITCH SETTINGS (See Fig. 1) RELAY OPERATING MODE The SE-701 has one output relay with isolated normally open and normally closed contacts. Switch 1 is used to set the operating mode of the output relay. In the fail-safe mode, the output relay energizes when the ground-fault circuit is not tripped. In the non-fail-safe mode, the output relay energizes when a ground-fault trip occurs INHIBIT Switch 2 is used to select Class I or Class II operation. In the INHIBIT OFF position, high-current inhibit is off for Class I operation. In the INHIBIT ON position, highcurrent inhibit is on for Class II operation. If high-current inhibit is on and ground-fault current escalates above eleven times the CT-primary rating before the ground-fault circuit trips, the output relay will not operate until ground-fault current falls below eight times the CT-primary rating. This feature allows the overcurrent protection to operate in applications where the ground-fault current can be larger than the interrupting capacity of the device tripped by the SE CT VERIFICATION Switch 3 is used to enable CT verification with the EFCT-1 or EFCT-2. In the CT VERIFY ON position, a trip will occur if the CT is disconnected. The red LED will flash to indicate a trip initiated by a CT fault. Switch 3 must be in the CT VERIFY OFF position when a 5-A- or 1-Asecondary CT is used FILTER SELECTION Switch 4 is used to select the filtering algorithm for a fixed-frequency (50/60 Hz) or variable-frequency application. The fixed-frequency algorithm allows lower trip levels to be used by rejecting harmonics that can cause nuisance tripping. The variable-frequency setting should be used if the CT is located on the load side of a variablefrequency drive AUTORESET Switch 5 is used to select autoreset or latching trips. See FRONT-PANEL CONTROLS GROUND-FAULT TRIP LEVEL The % CT PRIMARY selector switches are used to set the ground-fault trip level as a percentage of the CT-primary rating. Protection against arcing ground faults in a solidly grounded system requires a ground-fault CT that will not saturate below the operating value of the overcurrent protection. For reliable ground-fault detection, the groundfault trip level must be substantially below the prospective ground-fault current. To avoid sympathetic tripping, the trip level must be above the charging current of the largest feeder; and to eliminate nuisance tripping, surge current must not saturate the CT. See Startco Technical Information 11.1 available at GROUND-FAULT TRIP TIME The TIME (s) selector switch is used to set the groundfault trip time for coordination with upstream and downstream ground-fault devices. Coordination requires the same trip level for all ground-fault devices in a system and the trip time to progressively increase upstream. The amount of equipment removed from the system will be a minimum if the first ground-fault device to operate is the one immediately upstream from the fault RESET The reset circuit responds only to a momentary closure so that a jammed or shorted switch will not prevent a trip. The front-panel RESET switch is inoperative when the remotereset terminals (6 and 7) are shorted.

6 Startco Engineering Ltd. Page 2 FIGURE 1. SE-701 Outline and Mounting Details.

7 Startco Engineering Ltd. Page 3 If Switch 5 is in the LATCHING position, a trip remains latched until the RESET switch is pressed, the remote-reset terminals are momentarily shorted, or the supply voltage is cycled. Cycling the supply voltage will not reset (black) the fluorescent flag. If Switch 5 is in the AUTORESET position, a trip will reset when the fault is removed. The fluorescent flag will not reset until the RESET switch is pressed or the remotereset terminals are momentarily shorted. Cycling the supply voltage will not reset the fluorescent flag unless the remotereset terminals are shorted. If Switch 5 is in the AUTORESET position and the remote-reset terminals are shorted, operation is the same as for older SE-701 s with the A1 or A2 option TEST The TEST switch is used to test the ground-fault circuit, the indication, and the output relay. When the TEST switch is pressed for one second; the circuit will trip, trip indication will come on, and the output relay will operate. If highcurrent inhibit has been selected, the inhibit indicator will come on. 2.3 FRONT-PANEL INDICATION POWER The green LED labeled PWR indicates presence of the supply voltage GROUND-FAULT TRIP The red LED and the fluorescent flag, labeled TRIP, indicate a trip. A solid red LED indicates a ground-fault trip and a flashing LED indicates a trip initiated by a CT fault INHIBIT The yellow LED labeled INHB indicates that outputrelay operation was inhibited during a high-current ground fault. Inhibit indication is reset when the ground-fault trip is reset. Inhibit operation and indication will not respond if Switch 2 is in the INHIBIT OFF position. 2.4 ANALOG OUTPUT The non-isolated, 0 to 5-V analog output indicates ground-fault current sensed by the ground-fault CT. The output is 5 V at 100% of the CT-primary rating. 3. INSTALLATION Pass the phase conductors through the CT window as shown in Fig. 2 (for 4-wire and single-phase systems, also pass the neutral conductor through the CT window). Do not pass ground conductors through the CT window. In applications that require shields or drain wires to pass through the CT window, return them through the CT window before connecting them to ground. If a groundfault CT with a 5-A secondary is used, connect it to terminals 2 and 3 (terminals 1 and 3 with a 1-A secondary) and ground terminal 3. If the EFCT-1 or EFCT-2 is used, connect it to terminals 4 and 5, connect the shield to terminal 5, and ground terminal 5. Remove the connection to terminal 9 for dielectric-strength testing all inputs and outputs have ANSI/IEEE C37.90 surge-protection circuits that conduct above 300 Vac. 4. TECHNICAL SPECIFICATIONS Supply: 01 Option Vac (+15%, -40%), 50/60 Hz, 2.5 VA 02 Option Vac (+15%, -40%), 50/60 Hz, 2.5 VA 03 Option...24 Vac (+15%, -40%), 50/60 Hz, 2.5 VA 0S Option or 240 Vac (+15%, -40%), 50/60 Hz, 2.5 VA 0U Option...55 to 275 Vac, 50/60 Hz, 3.5 VA 75 to 275 Vdc, 2.0 W (1) 0D Option...9 to 36 Vdc, 3.0 W (1) 0T Option...30 to 70 Vdc, 3.0 W (1) (1) CSA Certification pending. Dimensions: Height...75 mm (3.0") Width...55 mm (2.2") Depth mm (4.5") Shipping Weight kg (1 lb.) Trip-Level Range...1% to 99% CT-Primary Rating in 1% increments (50 ma to 4.95 A with EFCT-1 or EFCT-2) Trip-Time Settings , 0.10, 0.20, 0.30, 0.40, 0.50, 1.0, 1.5, 2.0, and 2.5 s Accuracies: Trip Level...+1%, -5% of trip level for settings 10%. +0.1%, -0.5% of full scale for settings 9%. Trip Time ms, -25 ms

8 Startco Engineering Ltd. Page 4 FIGURE 2. Typical Connection Diagram.

9 Startco Engineering Ltd. Page 5 Inhibit: Off... Class I On... Class II Level x CT-Primary Rating Input: Algorithms... DFT Digital or Peak Digital Filter to 60 Hz, Bandpass CT... 1-A or 5-A Secondary Rating, EFCT-1, or EFCT-2 Thermal Withstand: Continuous... 5 x CT-Secondary Rating 1-Second x CT-Secondary Rating Burden... < 0.01 Ω for 5-A input < 0.05 Ω for 1-A input Operating Mode... Latching or Autoreset Analog Output: Range... 0 to 5 V, 5 V = 100% Output Impedance Ω Reset... Front-Panel Switch and Remote, N.O. Contact Functional Test... Front-Panel Switch Output Relay: Contact Rating... 8 A Resistive, 250 Vac/30 Vdc Contact Configuration... Isolated N.O. and N.C. Operating Mode... Fail-Safe or Non-Fail-Safe Supplemental Contact Ratings: Make/Carry 0.2 s...20 A Carry Continuous...8 A Break: dc...30 W Resistive, 15 W Inductive (L/R = 0.4 s) ac VA Resistive 1400 VA Inductive (PF = 0.4) Subject to maximums of 8 A and 250 V (ac or dc). Environment: Operating Temperature C to 60 C Storage Temperature C to 80 C Humidity...85% Non-Condensing Surge Withstand...ANSI/IEEE (Oscillatory and Fast Transient) Certification...CSA NRTL/C (Canada & USA) 5. ORDERING INFORMATION SE Vac Supply Vac Supply 3 24-Vac Supply S 120- or 240-Vac Supply U Universal ac/dc Supply D 9- to 36-Vdc Supply T 30- to 70-Vdc Supply EFCT-1...Sensitive Ground-Fault CT, 5-A Primary Rating, 82-mm (3.2") Window EFCT-2...Sensitive Ground-Fault CT, 5-A Primary Rating, 155-mm (6.1 ) Window EFCT-1FC...Flux Conditioner, 70 mm (2.7 ) Window EFCT-2FC...Flux Conditioner, 139 mm (5.5 ) Window PMA-55...Panel-Mount Adapter SE-EFVC...Voltage Clamp NRTL /C LR Consult factory for custom mounting adapters.

10 Startco Engineering Ltd. Page 6 FIGURE 3. EFCT-1 Outline and Mounting Details.

11 Startco Engineering Ltd. Page 7 FIGURE 4. EFCT-2 Outline and Mounting Details.

12 Startco Engineering Ltd. Page 8 SE-701 Ground-Fault Monitor Rev. 2 FIGURE 5. PMA-55 Panel-Mount Adapter.