earth leakage current measurement and elcb (rcd) trip ... · earth leakage current measurement and...
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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 )[email protected] / [email protected]