7
IEEE Transactions on Energy Conversion, Vol. EC-2, No. 4, December 1987 513 AN UNINTERRUPTIBLE POWER SYSTEM AS A SAFETY RELATED ISOLATION DEVICE FOR NUCLEAR POWER PLANTS Valdas Gelazis - Member IEEE David C. Griffith - Sr. Member IEEE William Kosarko Cyberex, Inc. 7171 Industrial Park Blvd. Mentor, Ohio Abstract - This paper describes the test The test program was designed to measure the procedure and results of a program to qualify a effects on the inputs to the UPS when its output is Class lE uninterruptible power supply (UPS) as a short circuited or grounded. Application of power circuit isolation device between Class 1E certain UPS systems is such that the UPS input is power input sources and non-Class IE load circuits supplied from Class IE power sources while the UPS for application in a nuclear power plant. Results output supplies non-Class IE loads. Therefore, the demonstrate that the tested equipment provides system must operate in the event of a short suitable isolation and that the UPS is completely circuited or grounded UPS output fault condition. self-protecting as well as providing its norinal UPS The UPS system must function as a power circuit functions with automatic static bypass in the event isolation device to limit the effects on the Class of UPS failure or externally applied overload. IE power sources to acceptable values as a result of these faults. Thirty four system configurations Introducti on were involved in the testing. A 20 KVA single phase 60 Hz static UPS system Acceptance Criteria previously qualified for Class IE service and configured as shown in Figures 1 and 2 was Testing is to demonstrate that the application subjected to a series of tests to determine its of line to line or line to ground faults at the suitability as a power isolation device*. The UPS inverter output and at the UPS output does not contained a static inverter with input cause the UPS input source to exceed the input auctioneering diodes connected to a 125 VDC Class current and voltage as shown below: 1E battery bus which acted as its alternate input. The battery was charged externally and also energized other Class IE loads. The normal input Source Vaniation to the inverter was from a 480V 3 phase 60 Hz Class IE source which fed a regulated rectifier which in "Alternate" DC Supply 105 - 140V DC turn fed the inverter input. With the rectifier voltage normally higher than the battery voltage, the diodes would block current from flowing from "Normal" AC Supply 480 +1- 10%V (L-L) the battery bus to the inverter. This inverter fed 3 Phase 55A rms through a static transfer switch and manual bypass maxiimum steady state switch to a 120V single phase non-Class 1E load. 0-132A Peak for The back up input, a 480V 1 phase 60 Hz Class IE 10 msec source fed a line voltage regulator, which in turn was the bypass source input to the static and "Back-UP" AC Supply 430V +1- 10%\ manual bypass switches. The static switch would 1 Phase 0-78A rms automatically transfer between the normal and maximum steady state bypass sources to provide for excess overload and 01500A Peak for 20 for failure or degradation of the inverter output msec voltage for any reason. Test S *A device is considered to be a power circuit The instrumentation and fault circuit breakers isolation device if it is applied such that the (breakers) were connected as shown in Figure 3. maximnum credible voltage or current transient The required faults were applied by closing applied to the non-class IE side of the device will the "Fault" breaker with the appropriate jumper not degrade below an acceptable level the operation installed on the load side terminals. An of -the circuit on the other side of that device. ot-ope nrie yivre rUSotu It was determnined that in the case of a UPS system voltage was also connected to the load terminals of with non IE output that the m-aximum credibleth"Fu"braetognaete"Tie"pls voltage or current would occur due to a short circuit or ground fault on the UPS or inverter to the recorders. output. The data recording was done by (2) eight channel chart recorders which were triggered simultaneously by closing the "Fault" breaker. The -recorders were set up so that pre-tri gger data 87 WM 194-4 A paper recommended and approved (retained for reference) represented 25%o of the by the IEEE Nuclear Power Engineering committee of total record. The tri gger i s recorded by an event the Power Engineering society for presentation at pen located between channel s 7 and 8. The event the IEEE/PES 1987 winter Mleeting, New Orleans, pen between channels 1 and 2 recorded pulses 2 Louitsiana, February 1 - 6, 1987. manuscript mill iseconds apart generated by an internal clock submitted August 26, 1986; made available for as a check of recorders speed control. printing December 15, 1986. 0885-8969/87/1200-0513$O1 .OO© 1988 IEEE

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Page 1: An Uninterruptible Power System as a Safety Related Isolation Device for Nuclear Power Plants

IEEE Transactions on Energy Conversion, Vol. EC-2, No. 4, December 1987 513

AN UNINTERRUPTIBLE POWER SYSTEM AS A SAFETY RELATEDISOLATION DEVICE FOR NUCLEAR POWER PLANTS

Valdas Gelazis - Member IEEEDavid C. Griffith - Sr. Member IEEE

William Kosarko

Cyberex, Inc.7171 Industrial Park Blvd.

Mentor, Ohio

Abstract - This paper describes the test The test program was designed to measure the

procedure and results of a program to qualify a effects on the inputs to the UPS when its output is

Class lE uninterruptible power supply (UPS) as a short circuited or grounded. Application of

power circuit isolation device between Class 1E certain UPS systems is such that the UPS input is

power input sources and non-Class IE load circuits supplied from Class IE power sources while the UPS

for application in a nuclear power plant. Results output supplies non-Class IE loads. Therefore, the

demonstrate that the tested equipment provides system must operate in the event of a short

suitable isolation and that the UPS is completely circuited or grounded UPS output fault condition.self-protecting as well as providing its norinal UPS The UPS system must function as a power circuit

functions with automatic static bypass in the event isolation device to limit the effects on the Class

of UPS failure or externally applied overload. IE power sources to acceptable values as a resultof these faults. Thirty four system configurations

Introduction were involved in the testing.A 20 KVA single phase 60 Hz static UPS system Acceptance Criteria

previously qualified for Class IE service andconfigured as shown in Figures 1 and 2 was Testing is to demonstrate that the applicationsubjected to a series of tests to determine its of line to line or line to ground faults at thesuitability as a power isolation device*. The UPS inverter output and at the UPS output does notcontained a static inverter with input cause the UPS input source to exceed the inputauctioneering diodes connected to a 125 VDC Class current and voltage as shown below:1E battery bus which acted as its alternate input.The battery was charged externally and alsoenergized other Class IE loads. The normal input Source Vaniationto the inverter was from a 480V 3 phase 60 Hz ClassIE source which fed a regulated rectifier which in "Alternate" DC Supply 105 - 140V DCturn fed the inverter input. With the rectifiervoltage normally higher than the battery voltage,the diodes would block current from flowing from "Normal" AC Supply 480 +1- 10%V (L-L)

the battery bus to the inverter. This inverter fed 3 Phase 55A rmsthrough a static transfer switch and manual bypass maxiimum steady state

switch to a 120V single phase non-Class 1E load. 0-132A Peak for

The back up input, a 480V 1 phase 60 Hz Class IE 10 msec

source fed a line voltage regulator, which in turnwas the bypass source input to the static and "Back-UP" AC Supply 430V +1- 10%\manual bypass switches. The static switch would 1 Phase 0-78A rmsautomatically transfer between the normal and maximum steady state

bypass sources to provide for excess overload and 01500A Peak for 20

for failure or degradation of the inverter output msec

voltage for any reason. Test S

*A device is considered to be a power circuit The instrumentation and fault circuit breakers

isolation device if it is applied such that the (breakers) were connected as shown in Figure 3.

maximnum credible voltage or current transient The required faults were applied by closingapplied to the non-class IE side of the device will the "Fault" breaker with the appropriate jumpernot degrade below an acceptable level the operation installed on the load side terminals. An

of -the circuit on the other side of that device. ot-ope nrie yivre rUSotuIt was determnined that in the case of a UPS system voltage was also connected to the load terminals of

with non IE output that the m-aximum credibleth"Fu"braetognaete"Tie"plsvoltage or current would occur due to a shortcircuit or ground fault on the UPS or inverter to the recorders.output. The data recording was done by (2) eight

channel chart recorders which were triggeredsimultaneously by closing the "Fault" breaker. The-recorders were set up so that pre-trigger data

87 WM 194-4 A paper recommended and approved (retained for reference) represented 25%o of the

by the IEEE Nuclear Power Engineering committee of total record. The tri gger i s recorded by an event

the Power Engineering society for presentation at pen located between channel s 7 and 8. The event

the IEEE/PES 1987 winter Mleeting, New Orleans, pen between channels 1 and 2 recorded pulses 2

Louitsiana, February 1 - 6, 1987. manuscript mill iseconds apart generated by an internal clock

submitted August 26, 1986; made available for as a check of recorders speed control.

printing December 15, 1986.

0885-8969/87/1200-0513$O1 .OO©1988 IEEE

Page 2: An Uninterruptible Power System as a Safety Related Isolation Device for Nuclear Power Plants

514

Signal conditioners were used to isolate therecording system from the power sources and toconvert the measured values to voltage within therecorders input capability.

Test Results and Discussions

Ground Fault Tests

The ground fault test configurations are -llisted in Table 1. It describes the tested fault TABLEconditions. CHART LIST, GROUND FAULT TESTS

The operating UPS charged the stray MANUALcapacitances to the grounded enclosures. The TEST BYPASS SW. AVAILABLE FAULT SNO. POSITION SOURCES TYPE COMMIENTSground fault tests discharged this stored charge.During Tests 1 through 21, there was no disturbance 1 NORMAL ALL INVERTER OUTPUT *on any of the input sources: ALTERNATE, NORMAL or TO GROUNDBACK-UP when each of the fault types were applied. 2 BYP-PREF ALL INVERTER OUTPUT

TO GROUNDFigure 4 is the oscillogram trace of test #8, 3 BYP-ALT ALL INVERTER OUTPUT *

a typical example of the results. Note that exept TO GROUNDfor Channel 7B there is no detectable effect on any 4 BYP-PREF NORMAL INVERTER OUTPUT *input. ISOLATE ALTERNATE TO GROUND

6 NORMAL ALTERNATE INVERTER OUTPUT *CHANGED CHANNEL:Channel 7B of the charts indicates the ground BACK-UP TO GROUND ANOLY NO SEE.

fault current sensed by CT7. The fault current wasindicated as oneormorenarrowspikesoflessth7 NORMAL NORMAL INVERTER OUTPUT *indicated as one or more narrow spikces Of less Ihan BACK-UP TO GROUND

2 amperes with a corresponding narrow dip in the 8 NORMAL ALL UPS OUTPUT TOUPS and/or inverter output voltage waveform. 8ROUNT O9 BYP-PREF ALL UPS OUTPUT TO*All ground fault tests were successful in GROUND

accordance with the test acceptance criteria. 10 BYP-ALT ALL UPS OUTPUT TO *GROUND

Inverter/UPS Output to Neutral Faul t Test 11 BYP-ALT NORMAL UPS OUTPUT TO *ISOLATE ALTERNATE GROUND

This series of tests simulated a direct short 12 NORMAL ALTERNATE UPS OUTPUT TO *circuit (phase to neutral) on the inverter and UPS BACK-UP GROUNDoutputs. The UPS reacts to an output faul t by 13 NORMAL NORMAL UPS OUTPUT TO *transferring the load (fault) to the back-up (480V BACK-UP GROUNDAC, single phase) source if it is available. When 14 BYP-ALT BACK-UP UPS OUTPUT TO *MISPLACEDthe back-up source is not available the inverter ISOLATE GROUND CLIPLEAD (SEE)goes into the current limit mode and the alternate(125V DC) source supplies inverter no load current 15 NORMAL ALL GRLUTO(20-25 amps) continuously. In all cases, the 16 BYP-PREF ALL NEUTRAL TOalternate (DC) and normal (480V AC) supplies did GROUNDnot exceed the acceptance criteria values. 17 BYP-ALT ALL NEUTRAL TO *

GROUNDTable 2 lists all the test configurations for 18 BYP-PREF NORMAL NEUTRAL TO *

the output to neutral fault tests and the comments ISOLATE ALTERNATE GROUNDto the right apply to those tests. 19 NORMAL ALTERNATE NEUTRAL TO *

BACK-UP GROUNDSee Figure 5 for Test #22, a typical result of 20 NORMAL NORMAL NEUTRAL TO *

the short circuit tests. Note that despite a BACK-UP GROUNDsuddenly applied fault across the inverter output, 21 BYP-ALT BACK-UP NEUTRAL TO *the equipment protected itself without substantial ISOLeffect upon any i nput power source . The sequence No deviation was observed on voltage and current waveforms of Alternateas shown in table 2 is that the inverter goes into DC, Normal AC and Back-up AC source.current limit and the static switch transfers toback up (with an up to 1/2 cycle overlap) causingthe back up supply to deliver fault current throughthe line voltage regulator which clears the fuse onthe inverter side of the static switch (Fll5) andthen recoveres to normal voltage.

The current transformers used to moni tor faul tcurrents prematurely saturated and do not indicatethe actual magnitude of the faul t current. M9osttests were repeated using a coaxial shunt to recordthe faul t currents .

When ground faul t tests were finished, theground current transformer CT7 was l eft connectedto Channel 73 and was reacting to (measuring) themagnetic fiel ds generated by faul t currents i nnearby conductors.

Page 3: An Uninterruptible Power System as a Safety Related Isolation Device for Nuclear Power Plants

515

Discussion of events on Test Charts 22-34.

Test 22 Produced the typical events resulting from a fault onthe inverter output.

TABLE 2 1. Inverter goes into current limit2. Static Switch transfers to backup. The inverter

TEST CHART LIST is still connected to the load.3. Back-up source clears F151 (870 amp peak) andrecovers to supply the load with only a short

TEST MANUAL BYPASS SOURCES FAULT interruption.NUMBER SWITCH POSITION AVAILABLE TYPE COMMENTS**

23 Repeat 1 The Static Switch is still energized and active in22 NORMAL ALL INVERTER FUSE F151 the BYP position and the static switch output is

OUTPUT TO CLEARED (OPEN)** disconnected from the load. During Test 23 Repeat 1,NEuTRAL the static switch initiated a transfer to back-up

22 REPEAT 1 NORMAL ALL INVERTER FUSE F151 source with the resulting shoot-thru clearing F151OUTPUT TO CLEARED ** (1000 amp peak).NEUTRAL

23 BYP-PREF ALL INVERTER ** Test 24 and 25 Produced inverter current limit. The inverter is noti OUTPUT TO connected to the UPS load. Back-up source is

NEUTRAL supplying the load.

23 REPEAT 1 BYP-PREF ALL INVERTER FUSE F151 Test 26 and 27 Are similar to Test 23 and 23 Repeat 1.OUTPUT TO CLEARED ** -_NEUTRAL Test 28 Produced a fast transfer to backup source without

24 BYP-ALT ALL INVERTER **Repeat 1 inverter going into current limit and fault currentOUTPUT TO supplied from back-up source. (675 amp RMS measuredNEUTRAL at 480V incoming side) SEE NOTE #1

24 REPEAT 1 BYP-ALT ALL INVERTER *OUTPUT TO 'Test 29 Produced a current of 1500 amp peak (at 480V)NEUTRAL Repeat 1 supplied by back-up source. SEE NOTE #1

25 BYP-PREF NORMAL INVERTER ** Test 30 Produced the fault current supplied by back-upISOLATE ALTERNATE OUTPUT TO Repeat 1 source. (750 amps RMS) SEE NOTE #1

NEUTRAL

26 NORMAL ALTERNATE INVERTER FUSE F151 Test 31 Produced a delayed inverter current limit, theBACK-UP OUTPUT TO CLEARED ** inverter attempted to supply the fault but did not

NEUTRAL exceed the acceptance criteria during the delay.

26 REPEAT 1 NORMAL BACK-UP INVERTER SHOOT ** Test 32 Produced a fault occuring near voltage zero crossingOUTPUT TO THROUGH

; NEUTRAL CURRENT causing a delay in inverter current limit initiation.

27 NORMAL NORMAL INVERTER F151 CLEARED** Test 33 Produced a quick transfer, fault occurred at voltageBACK-UP OUTPUT TO maximum.

NEUTRAL

27 REPEAT 1 NORMAL NORMAL INVERTER ** Test 33 Produced a minimum disturbance to the inverterBACK-UP OUTPUT TO Repeat 1 transfer. The fault occurred near voltage zero

NEUTRAL crossing.

2B NORMAL ALL UPS OUTPUT F301 CLEARED Test 34 Produced the maximum continuous fault currentlTO NEUTRAL AFTER CHART

ENDS~~~ Repeat 1 requirement from back-up source (700 amp RMS) SEE

ENDS **NOTE #1

za REPEAT 1 NORMAL ALL UPS OUTPUT F301 CLEAREDTO NEUTRAL AFTER CHART

ENDS *

29 BYP-PREF ALL UPS OUTPUT ** NOTES: #1 In these cases the current exceeds the acceptanceTO NEUTRAL current level for the back up source. However, the

recommended service feeder circuit breaker will clearl29 REPEAT 1 BYP-PREF ALL UPS OUTPUT SHOOT THROUGH any fault in excess of 600 amperes within 0.02

TO NEUTRAL CURRENT ** seconds.

30 BYP-ALT ALL UPS OUTPUT F301 CLEAREDTO NEUTRAL AFTER CHART

ENDS **

30 REPEAT 1 BYP-ALT ALL UPS OUTPUT F301 CLEAREDTO NEUTRAL AFTER CHART Conclusions

ENDS **

31 BYP-PREF NORMAL UPS OUTPUT * The input sources, (Alternate DC, Normal AC,ALTERNATE TO NEUTRAL and Back-up AC), were not affected by connecting an

32 NORMAL ALTERNATE UPS OUTPUT F101 & F301 output line to ground. There was no disturbanceBACK-UP TO NEUTRAL OPENED AFTER indicated on any input source waveform, at or afterCHART ENDS the ground fault application in all UPS

32 REPEAT 1 NORMAL ALTERNATE UPS OUTPUT F301 OPENED configurations. The input sources were notBACK-UP TO NEUTRAL AFTER CHART niuain. Te ipt sucs wr oENDSRH adversely affected by applying line to neutral

faults to either the Inverter or UPS outputs.33 NORMAL NORMAL UPS OUTPUT F301 CLEARED

BACK-UP TO NEUTRAL AFTER CHART Output faults reduce power requirements from theseENDS ** sources due to the Inverter's sel f protecting

33 REPEAT 1 NORMAL NORMAL UPS OUTPUT F301 CLEARED current limiit action.BACK-UP TO NEUTRAL AFTER CHART

ENDS **When the back-up source is required to supply

34 BYP~~~OV-ALT BACK-UPD UPS OUITPUT Flnl CLEARED -. ._ .- I- !- 1 1-34 BYP-ALT ACK-UP UPTONEUTRA AFTER CHEARTD faul t current it i s limited in magnitude andENDS ** duration by the l ine vol tage regulator's series

34 REPEAT 1 BYP-ALT BACK-UP UPS OUTPUT F301 CLEARED impedance and overcurrent protective devices. TheISOLATE TO NEUTRAL AFTER CHART maximum fault current requirement from the

EN** ~"Back-UJp" is substantially sinusoidal 60 Hz current** No deviation was observed on voltage and current waveforns of Alternate DC for approximiately 1.5 seconds until F301 melts out,

or Normal AC source. - ~~but the feeder source Circuilt breaker in theinstallation will clear the fault i n far less than1.5 seconds .

The tested UPS demonstrated i ts ability to actas a power isolation device .

Page 4: An Uninterruptible Power System as a Safety Related Isolation Device for Nuclear Power Plants

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Page 5: An Uninterruptible Power System as a Safety Related Isolation Device for Nuclear Power Plants

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Page 6: An Uninterruptible Power System as a Safety Related Isolation Device for Nuclear Power Plants

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