A DS200NATOG3 circuit board. This board can be used as part of a combined cycle power plant’s control system.
In this short blog post we’ll answer some of the most common questions about combined cycle power plants.
What is a combined cycle plant?
Power plants generate electricity by driving a generator rotor through connected turbines. Power plants use different ways to generate the force to turn turbine blades. A mechanical force from wind or water or energy capture from fuels like coal, diesel, natural gas, and uranium changing states turn the blades.
A combined-cycle plant is a kind of thermal power plant. It uses a combination of two cycles of different energy capture. The first cycle uses natural gas combustion, which drives the generator. The heat from this cycle is used to create steam. The steam is used in the second cycle to produce energy via a steam turbine before the steam condenses back into water.
GE’s Multilin Motor Management Relays provide protection and monitoring for three-phase motors. They also provide protection for their associated mechanical systems.
The GE Multilin 369 Motor Management Relay Series is designed with customizable relays. The units can protect three-phase motors and also offer monitoring applications.
Functional Summary Multilin 369
Display: 40 Character, Alphanumeric LCD
Status Indicators: 4 Output LEDs. Service LED, 5 other LEDs
Keypad: 12-buttons, including Help Key.
Interface: RS-232 comm port, Baud rate 120 to 19200
Case: Corrosion and flame-retardent
Digital Inputs: standard
Analog Inputs: Available
Current inputs: standard
Ground CT inputs: standard
Ports: 3 x RS485, Baud rate 1200 to 19200
RTD Inputs: available
Profibus Port: available
Backspin detection: available
Fiber Optic Data Link: available
Voltage Inputs: available
Protective Functions Multilin 369
Motor protection including:
Standard phase overload curves
Programmable (custom) overload curves
current unbalance
Management functions including:
Pre-trip data, to 40 events
starts per hour
time between starts
mechanical stall and jam
statistical data
backspin detection
flash memory
power metering (optional)
Technical Specifications Multilin 369
Control power: LO = 20 to 60 VDC, 20 to 48 VAC at 50/60 Hz, HI= 50 to 300 VDC, 40 to 265 VAC at 50/60 Hz
Power: Nominal: 20 VA, Max 65 VA
Fuse: T 3.15 Amp H 250 V, Timelag high breaking capacity
The GE Multilin 469 Motor Management Relay is used to manage and protect motors of many HP ratings.
Functional Summary Multilin 469
Display: 40 Character, Alphanumeric LCD
Status Indicators: 6 Output LEDs, 8 Motor Status LEDs, 8 other LEDs
Keypad:Alphanumeric with Help button, plus +/- value keys. Message toggle keys. Enter, Menu, Escape, and Reset Key.
Interface: RS-232 comm port
Case: draw-out, IP40-X
Digital Inputs: 9 opto-isolated
Analog Current Inputs: specifications vary
Differential Current Inputs: Primary, 1 to 5000 A. Secondary, 1 A or 5A.
Ground CT inputs: Primary, 1 to 5000 A. Secondary, 1 A or 5 A.
Phase Current Inputs: Primary 1 to 5000 A. Secondary, 1 A or 5 A.
RTD Inputs: 3 wire RTD types
Voltage Inputs: 273 VAC full scale
Ports: 2 x RS485
Modbus: Modbus RTU/half-duplex
Ethernet: Available
DeviceNet: Available
Backspin detection: Restart Block can act as a backspin timer
Protective Functions Multilin 469
Motor protection including:
Overload Pickup using RTDs
Overload Curve
Short Circuit Trip
Ground Fault
Unbalance Alarming
Acceleration Trip
Stopped/Running Cooling Times
Stator and Bearing RTDs
Unbalance bias of thermal capacity and K factor
Hot/cold curve ratio
Management functions including:
Starts per hour
Time between Starts
Enable Start Inhibit
Mechanical jam
Remote Switch
Vibration & Pressure Switches
Remote Start/stop
Breaker failure
Technical Specifications Multilin 469
Control Power: LO = 20 to 60 VDC, 20 to 48 VAC at 48 to 62 Hz, HI= 90 to 300 VDC, 70 to 265 VAC at 48 to 62 Hz
Power: 45 VA (max) 25 VA (typical)
Fuse: 2.50 A 5 x 20 mm SLO-BLO HRC Littelfuse, high breaking capacity
Operating Range: -40 to +60 Celsius
Humidity: up to 90%, non-condensing
Altitude: up to 2000 m
Pollution degree: 2
IP: check case
Overvoltage: check case
Other differences you may want to consider. While the Multilin 369 can be used for small or medium induction motors and induction motors with a cyclic load, they cannot be used for large induction motors or induction motors via VFD as the 469 Multilin can. Additionally, the 469 offers synchronous motor protection that the 369 doesn’t have.
Also keep in mind the 469 has trip/close coil supervision. The 369 doesn’t offer that.
Both Multilin options are extremely versatile. Since they both offer a wide operating temperature range (-40 C to +60 C) they are suitable for a number of climate conditions. So even if your factory has to deal with Canadian cold or Australian heat, these motor management relays should work well inside its walls.
Despite a shrinking job market due to the COVID-19 pandemic, the manufacturing sector showed job growth in twelve states.
Despite the COVID-19 pandemic, US manufacturing jobs showed growth in twelve states.
Over 700,000 workers lost their jobs in March across all sectors of the economy; 34,000 of those were manufacturing jobs. While news of large manufacturing layoffs and furloughs like ones at GE and Boeing have sparked alarm about the strength of the industry as a whole, the U.S. Bureau of Labor Statistics shows manufacturing posting significantly less than 1% job loss across all states. Twelve states, including Alabama, Arizona, Connecticut, Florida, Idaho, Kansas, Louisana, New Jersey, North Dakota, Rhode Island, South Dakota, and Utah all posted gains in employment that totaled 9200 jobs during the month of March. Additionally, four states reported no job losses.
Data below is broken down by state and compared to February 2020 employment numbers. All data was sourced from the US Department of Labor Bureau of Labor Statistics.
Updated March employment numbers can be found in our next post regarding April unemployment. These numbers were updated and released by the BOL on May 22, 2020.
Manufacturing Jobs Data by State
State
Feb 2020
March 2020
change
% change
Alabama
270,400
272500
2,100
0.78%
Alaska
11,200
10900
-300
-2.68%
Arizona
176,900
177300
400
0.23%
Arkansas
159,600
158100
-1,500
-0.94%
California
1,306,600
1,304,500
-2,100
-0.16%
Colorado
150,500
149,000
-1,500
-1.00%
Connecticut
161,300
162,100
800
0.50%
Delaware
26,800
26,600
-200
-0.75%
District of Columbia
1,400
1,300
-100
-7.14%
Florida
388,100
389,100
1,000
0.26%
Georgia
402,000
401,100
-900
-0.22%
Hawaii
13,900
13,900
0
0.00%
Idaho
67,500
67,700
200
0.30%
Illinois
573,300
573,200
-100
-0.02%
Indiana
532,900
530,100
-2,800
-0.53%
Iowa
222,300
221,800
-500
-0.22%
Kansas
167,500
168,200
700
0.42%
Kentucky
252,200
251,700
-500
-0.20%
Louisiana
133,900
135,300
1,400
1.05%
Maine
52,300
52,100
-200
-0.38%
Maryland
113,700
112,500
-1,200
-1.06%
Massachusetts
243,000
242,800
-200
-0.08%
Michigan
621,600
619,200
-2,400
-0.39%
Minnesota
318,100
317,400
-700
-0.22%
Mississippi
148,600
147,700
-900
-0.61%
Missouri
276,300
274,600
-1,700
-0.62%
Montana
20,200
20,000
-200
-0.99%
Nebraska
99,000
98,900
-100
-0.10%
Nevada
59,000
58,400
-600
-1.02%
New Hampshire
71,200
70,800
-400
-0.56%
New Jersey
251,800
252,700
900
0.36%
New Mexico
28,800
28,800
0
0.00%
New York
436,600
435,800
-800
-0.18%
North Carolina
476,700
473,000
-3,700
-0.78%
North Dakota
25,600
25,700
100
0.39%
Ohio
700,900
698,300
-2,600
-0.37%
Oklahoma
137,600
137,400
-200
-0.15%
Oregon
193,200
192,300
-900
-0.47%
Pennsylvania
573,700
571,000
-2,700
-0.47%
Rhode Island
39,200
39,500
300
0.77%
South Carolina
258,400
258,400
0
0.00%
South Dakota
43,400
43,800
400
0.92%
Tennessee
354,100
353,900
-200
-0.06%
Texas
910,500
900,700
-9,800
-1.08%
Utah
135,400
136,300
900
0.66%
Vermont
29,300
29,000
-300
-1.02%
Virginia
241,400
240,100
-1,300
-0.54%
Washington
290,900
290,000
-900
-0.31%
West Virginia
46,200
45,800
-400
-0.87%
Wisconsin
477,600
477,400
-200
-0.04%
Wyoming
10,000
10,000
0
0.00%
Puerto Rico
75,300
75,000
-300
-0.40%
Virgin Islands
800
800
0
0.00%
Totals:
12,778,700
12744500
-0.27%
A chart showing manufacturing job numbers by state.
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