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16

Instruction Leaflet

IL019226EN

Effective October 2018

C-HRG technical information

and adjustment procedure

EATON

www.eaton.com

Note

: When using clamp-on ammeter to trace fault,

always include all three phases within ammeter jaws.

Figure 16. Clamp-on ammeter

Note

: 3W load, one cable per phase, phase C is faulted to ground inside conduit. Ground current can

divide into several components, depending on number, conductivity, and location of conduit ground points.

Figure 17. Example of a typical fault

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Summary of Contents for C-HRG

Page 1: ... PROCEDURES DESCRIBED IN THIS INSTRUCTION LEAFLET COULD RESULT IN DEATH BODILY INJURY OR PROPERTY DAMAGE CAUTION SPECIFIC OPERATING PROCEDURES MUST BE DEVELOPED BY THE RESPONSIBLE PARTY BECAUSE OF THE UNIQUE APPLICATION AND VAST VARIETY OF SYSTEM AND USER REQUIREMENTS FAILURE TO DEVELOP SPECIFIC PROCEDURES COULD LEAD TO IMPROPER USE OR OTHER MORE SERIOUS CONSEQUENCES C HRG equipment components and...

Page 2: ...or a separately mounted resistor assembly keep in mind that it will give off considerable heat Do not mount it on a combustible surface or adjacent to heat sensitive material or equipment Walls or floor must be sufficiently level to allow doors and covers to remain properly aligned with the structure If embedded channel iron floor sills are used they must be at or above floor level Refer to assemb...

Page 3: ...he current This is normal and comes from residual process oils and the curing of the resistor tube insulation Lower current levels may allow the initial burn off to occur gradually with little or no visible smoking Smoking may reoccur after the initial burn off if dust or other contamination is allowed to accumulate Refer to maintenance procedures outlined in this manual Current relay device 51N T...

Page 4: ... through the resistor causing ground current to flow The system then reacts as it would under actual system ground conditions The lights turn on alarm contacts transfer and the optional alarm horn sounds Because periodic testing is the only assurance of continuing reliability a program of regular testing and maintenance is strongly recommended Pulser circuit The pulser circuit offers a convenient ...

Page 5: ...o change in the pulsing current is noted along the entire length of a conduit then the fault may be in the connected load If the load is a panelboard distribution switchboard or motor control center repeat the process of checking all outgoing cable groups and conduits to find the faulted feeder If the fault is not found in an outgoing feeder the fault may be internal to that equipment An important...

Page 6: ...o allow application on power systems with an available fault current of 200 kA rms at 600 Vac maximum If any fuse must be replaced be certain that only an identically rated ULT listed fuse is installed If a substandard or underrated fuse is used it may rupture violently causing burns electrical shock and or substantial equipment damage If the original fuse is not available or its markings not legi...

Page 7: ... 141 IEEE Recommended Practice for Electrical Power Distribution for Industrial Plants recommends a resistance value that limits the maximum ground current between 5 A and 10 A for high resistance ground systems It also recommends for high resistance grounding to be used only in systems of 5 kV or lower charging currents of 5 5 A or lower and never in 15 kV systems A way to estimate the capacitive...

Page 8: ...ent 5 Put the C HRG in test mode 6 Make sure the selector switch is held in test position The switch has a spring return to normal position and must be held in test position 7 The relay should not pick up the test current 8 De energize the equipment 9 Set the relay to one setting below the allowed ground return current 10 Re energize the equipment 11 Put the C HRG in test mode and hold the switch ...

Page 9: ...019226EN Effective October 2018 C HRG technical information and adjustment procedure EATON www eaton com Figure 4 Four wire system fault detection via current relay Figure 5 Four wire system fault detection via voltmeter relay ...

Page 10: ...g zag grounding transformers fault detection via current relay Figure 7 Three wire system zig zag grounding transformers fault detection via voltmeter relay Figure 8 Three wire system wye broken delta grounding transformers fault detection via current relay Figure 9 Three wire system wye broken delta grounding transformers fault detection via voltmeter relay ...

Page 11: ...ion Leaflet IL019226EN Effective October 2018 C HRG technical information and adjustment procedure EATON www eaton com Figure 10 Typical enclosure dimensions for NEMA 1 free standing system dimensions in inches mm ...

Page 12: ...ion Leaflet IL019226EN Effective October 2018 C HRG technical information and adjustment procedure EATON www eaton com Figure 11 Typical enclosure dimensions for NEMA 1 wall mounted system dimensions in inches mm ...

Page 13: ...13 Instruction Leaflet IL019226EN Effective October 2018 C HRG technical information and adjustment procedure EATON www eaton com Figure 12 Test log ...

Page 14: ...ction Leaflet IL019226EN Effective October 2018 C HRG technical information and adjustment procedure EATON www eaton com Figure 13 Standard front control panel detail voltmeter relay and alarm horn options shown ...

Page 15: ...d adjustment procedure EATON www eaton com Figure 14 Typical control scheme with fault detection via current relay and alarm option with re alarm timer Figure 15 Typical control scheme with fault detection via voltmeter optional loss of control power relay and optional push to test lights ...

Page 16: ... clamp on ammeter to trace fault always include all three phases within ammeter jaws Figure 16 Clamp on ammeter Note 3W load one cable per phase phase C is faulted to ground inside conduit Ground current can divide into several components depending on number conductivity and location of conduit ground points Figure 17 Example of a typical fault ...

Page 17: ...ion and adjustment procedure EATON www eaton com Note 3W load one cable per phase phase C is faulted to ground inside conduit Ground current can divide into several components depending on number conductivity and location of conduit ground points Figure 18 Example of a typical fault ...

Page 18: ...18 Instruction Leaflet IL019226EN Effective October 2018 C HRG technical information and adjustment procedure EATON www eaton com C HRG maintenance form Date Maintenance item By ...

Page 19: ...19 Instruction Leaflet IL019226EN Effective October 2018 C HRG technical information and adjustment procedure EATON www eaton com ...

Page 20: ... All Rights Reserved Printed in USA Publication No IL019226EN Z21760 October 2018 Eaton is a registered trademark All other trademarks are property of their respective owners C HRG technical information and adjustment procedure Instruction Leaflet IL019226EN Effective October 2018 ...

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