3.imimg.com file3 m qs1 qf1 qf2 pc m plc vfd a/d rs p i d work principle of lrs (gzyq) h.v. switch...
TRANSCRIPT
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Intelligent LRS (GZYQ) introduction
22Power ≤2000kWPower ≤2000kW Power Power >> 2000kW2000kW
GZYQ series: GZYQ series: used for soft starting of 3.3kV~ 15kV used for soft starting of 3.3kV~ 15kV synchronous or squirrel cage motorssynchronous or squirrel cage motors
Intelligent LRS (GZYQ) brief
33
M
QS1
QF1
QF2
PC
M
PLC
VFD
A/D
RS
P I D
Work principle of LRS (GZYQ)
H.V. H.V. switch panelswitch panel
H.V. H.V. Neutral panelNeutral panel
Intelligent LRSIntelligent LRS
Take an example of GZYQ-3000/11-Y Take an example of GZYQ-3000/11-Y for 11kV,3000kW squirrel cage motor (neutral point can be open)for 11kV,3000kW squirrel cage motor (neutral point can be open)
44
Resistance principle:
R=ρlS
Animation of intelligent LRS(GZYQ)
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Change in distance between fixed electrode and moving electrode leads to the change of liquid resistance
Animation of intelligent LRS(GZYQ)
66
Single line diagram of GZYQ- (line side)△
H.V. switch Panel
LRS
Switch panel
M
QS1
QF1
QF2
Rs
77
M
H.V. switch Panel
LRSH.V.
neutral panel
QS1
QF1
QF2
Rs
Single line diagram of GZYQ-Y (neutral side)
88
M
Other load
B1
11kV
S d min=188 MVA
Sbe=16 MVA
S fh=5 MVAcos φ fh=0 . 9sin φfh=0 . 436
Ud%=7.5
load
power network diagram
Parameters required for calculation:
1、 network parameter
2、motor parameter
3、 load parameter
990 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 10
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.82
n/nN
T/TN
U/UN=0.6
U/UN=0.7
U/UN=0.8
U/UN=0.9
U/UN=1
Torque and speed curve
T U∝ 2GZYQ torque & speed curveGZYQ torque & speed curve
1010
1500
I( A )
10 20 30 40 500 t (s)
750
5 15 25 35 45
D.O.L. starting current curve
GZYQ starting current curve
Starting current: GZYQ vs D.O.L.
Comparison between GZYQ and D.O.L. start
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Original torque & speed curveOriginal torque & speed curveRR11>R>R22>R>R33>R>R44ss
00
nn11
11
nnmm ssmm
Torque & speedTorque & speed curve: GZYQ vs reactor
Comparison between GZYQ and reactor
GZYQ torque & speed curveGZYQ torque & speed curve
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Reference: Oxygen plant of Goyal Gases Reference: Oxygen plant of Goyal Gases
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Reference: Oxygen plant of Goyal GasesReference: Oxygen plant of Goyal Gases
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Thank you !Thank you !