Earth Leakage Current Measurement and ELCB (RCD) trip analysis &

Chemical Factory Inverter AC_DC_Battery_Temp

Case study

2017. 09

Jaeshininformation Co., of Korea Distributor

Our Goal

We can follow IEEE1100 perfectly!

DC V & I ?

N-E V ?

Phase 1

Semiconductor Tools

1. Scope – Semiconductor Tools

Electric RoomELB Type

0.2Sec/800mAD-Box1

MCCB TypeD-Box2

MCCB Type

#3MCCB Type

CLS#1 MAIN3ph ELB Type0.1Sec/500mA

CLS#7 MAINELB #1 Type

0.1Sec/500mA

CLS #7 WALL HEATER1ph ELB Type0.1Sec/30mA

FACTORYMain E-Room

Trip Source ?

Wall Heater #1 ~ #14

A. General diagram

2. Diagram

Why trip:?3P4W 208/120V

B. Heater Diagram

2. Diagram

Why trip : ?

3. Measuring by PQube3

A. PQube3 Measuring Method

PQube3

250Ax 3CT

I7(5:0.333)

PT 220:24

1000 : 0.333

N current : 5~8 Amp

Noise FilterLeakage Current

: 960mA

Voltage : 5 pointsCurrent : 7 points

Leakage current : 1 pointSag Monitoring

Leakage Current: 45mA

Magnetic Contactor Monitoring

3. Measuring by PQube3

PSL Clamp on CT CP-1,000 = 1,000A : 0.333V

Split CT

PT = 220V : 24V

ZCT = 1,000mA : 0.333VFor earth leakage current

B. PQube3 Installation

3. Measuring by PQube3

4. Measuring Data

A. Harmonics

5. Event Data

A. 2016.7.30:15:18:36 ELB#1 Trip

Earth Leakage Current : trip soruce

Heater Current ( R, S, T - I6, I7, I8 )

Main ELCB Input L1-L2 V

5. Event Data

B. 2016.7.30:15:18:36 ELB#1 Trip

I8 Heater Current

5. Event Data

Trip tmie

5. Event Data

Earth Leakage Current : 1,400mA

Tripped within 0.1sec

5. Event Data

500mA duration : 35msec

ELCB Trip Threshold setting : 500mA, 0.1sec

5. Event Data

-0.003 sec

+0.005 sec

Earth Leakage Current

5. Event Data

-.0.003sec wave changed

I6 Heater Current

+0.01sec wave changed

5. Event Data

I7 Heater Current

- 0.005sec- wavechange + 0.005sec

Wave changed

5. Event Data

I8 Heater Current

+ 0.01 secWave changed

5. Event Data

B. 2016.8.3 05:11:56 2nd Trip

5. Event Data

B. 2016.8.3 05:11:56 2nd Trip

Leakage Current Trip Curve

Leakage Current Formula = 2 * π * 50Hz * 120V * C uF

5. Event Data

ELCB Trip threshold setting: 500mA, 0.1sec

500mA duration : 40msec

5. Event Data

L6 Heater Current

5. Event Data

L1-N Voltage

5. Event Data

6. Conclusion

A. Fixed the imperfect heater connection line.

B. Changed the process on-off time of heater.

The process was changed so that the change of the current

phase did not occur.

Phase 2.

Telecommunication Device

Ground Fault

SMPS

Normal ELCB IGR ELCB

1. Scope

Proof of earth leakage of capacitive leakage current and proposal of improvement method

ZCT

R, S, T, N

Dynamic Capacitive Leakage Current Instantaneous Rise in Electrical Leakage Circuit Breaker on no-problem power line

Tripping analysis modeling of earth leakage breaker in case of lightning, power line grounding

In the case of one phase ground fault, the earth leakage breaker trip occurs in unnecessary operation area due to the dynamic instant leakage current that momentarily increases the capacitive leakage current between the ground and power line.

TR lightning

arrester3P 3set

Analysis method ! : If the distribution line is grounded by lightning or trees, the high voltage is grounded from the lightning arrester to ground to prevent surge voltage from reaching the customer directly. On the other hand, the surge protector is attached to the front of the earth leakage breaker for the purpose of preventing the internal surge and induction light from the customer side. However, in order to prevent tripping of the earth leakage breaker, it is necessary to install a surge protection device of 12kV or more inside the earth leakage breaker none. This is because the earth leakage breaker is not tripped by the surge but tripped due to the instantaneous capacitive leakage current rise between the ground, which causes tripping of most earth leakage breaker installed in the wireless mobile communication repeater and internet communication equipment .

22.9kV :380V / 220V

2. Analysis model tripping of ELCB by lightning

Fault line

Normal line

Elevator distributor panel of Apartment

Normal load current 4.5A and replace with IGR-32, 20A with patent earth leakage breaker.

IGCgenerator

④3. Analysis model tripping of ELCB by Elevator

Rise of leakage current

Breaker trip does not occur even if leakage current 40mA or more occurs arbitrarily after replacing IGR breaker.

④3. Analysis model tripping of ELCB by Elevator

Elevator distributor panel of Apartment

frequently Tripping ELCB

PQube3 monitoring for earth leakage current

⑪④3. Analysis model tripping of ELCB by compressor motor’s

ground fault

#1 Air conditioner

normally R, S, T, N 380V, 220V between the normal status. N-G

is maintained below 1 volt.

Abnormal state 2V between S-G and 220V between N-G.

3. Analysis model tripping of ELCB by compressor motor’s ground fault

Periodically, T-phase grounded equipment is tracked and communicated at the start of air conditioner # 1. When the compressor of the air conditioner is grounded, the leakage breaker for the power source of the S phase is tripped.

S phase : Mobile device

power line

Daily trend of PQube3

④3. Analysis model tripping of ELCB by compressor motor’s

ground fault

Track equipment that periodically changes voltage. Noise level is measured, but not at a large level, but the periodic noise of 90 kHz is revealed by the air conditioner # 1 compressor motor.

3. Analysis model tripping of ELCB by compressor motor’s ground fault

90kHz Noise

⑪

N-G VT ph currentT ph V

Mobile leakage current

Sph currentMobile device

S ph V

④3. Analysis model tripping of ELCB by compressor motor’s

ground fault

Events that occur when changing waveforms

If a ground fault occurs on the T phase, the

circuit breaker for mobile device is tripped.

⑪④3. Analysis model tripping of ELCB by compressor motor’s

ground fault

In the real time measurementgraph of the instantaneousleakage current rise of thecircuit after replacing thefrequent trip breaker with theIGR breaker, a leakagecurrent of 15 mA maximumwas confirmed in connectionwith the N-G potential rise inthe graph. Based on this, it isestimated that the circuitbreaker may trip due to themotor start when the coolingload operation in summer isstarted..

3. Analysis model tripping of ELCB by compressor motor’s ground fault

4. Conclusion

A. LG U+ decided to install 6,000 sets of IGR ELCB in theirmobile and internet device power lines.

Phase 3.

Chemical Factory Inverter

AC_DC_Battery_ENV1

Analysis Case Study

1. Why did the battery cells temperature increase highly?

Temperature increased : why ?

Chemical Factory Inverter

Battery 2V x 60 cells

L1 - V

N

L1 - A

I6 – A : Analog - A

INPUT 440V 3P AC

PT 440V : 24V

AN-3 : Analog - V

EPT/TR

ATT2

DC currentHall Sensor

OUTPUT 120V ACPower Quality

AN-1 (V)

AN-2 (V)

Analog (A)

ENV-1

130V DC

Temperature : ℃

PQube3

2. PQube3 Connection

Lte Modem

3. PQube3 Connection and Installation pictures

3. PQube3 Connection and Installation pictures

3. PQube3 Connection and Installation pictures

Email receiving through Lte modem

ENV1

Inverter out : 120V AC

Inverter out current : 28 ~36A

Inverter input current : 20A

Charging volt : 0.13kV

Battery Charging current:0~20A

Inverter input volt : 440V

4. Monitoring

&Analyzing

Inverter output volt : 120V

Inverter output current

Inverter input current : ?

Charging volt : 130V DC

Charging current

Charging input volt

4. Monitoring

&Analyzing

Charging volt

Charging current

4. Monitoring

&Analyzing

Battery Temperature and

Humidity: No problems.

4. Monitoring

&Analyzing

Daily. Problem !

Charging current : 90A

During 14 hours

4. Monitoring

&Analyzing

Problem !

Charging current : 90A

During 14 hours

4. Monitoring

&Analyzing

5. Conclusion

A. The inverter had some problems in charging circuit.

Battery had no problems.

Phase 4.

IGR ELCB & Leakage Current

Analysis Technology

Introduction

made by Jaeshin’s patent

The capacitive leakagecurrent(IGC) occurredin LED Sensor LampLine.

The IGR ELCB can beonly installed in thiscase.

We want to share our technology with PSL’s partners !

Many thanks!CEO : Han, Jeong-kyu ( www.jsdata.co.kr )jasshininfo@korea.com / ceo@jsdata.co.kr