I. Electrical Equipment

(I) Motors

1. Variable Frequency Motor

Technical Parameters

Power range: 0.75-5000kW, Voltage level: 380V/660V/10kV

Protection level: IP54/IP55, Insulation class: F class (temperature resistance ≤155℃), Temperature rise limit ≤100K

Speed regulation range: 1:100 (vector control), Speed fluctuation ≤±0.5%, Efficiency ≥95% (above 1000kW)

Cooling method: IC416 (air-air cooling)/IC81W (water cooling), Noise ≤85dB (1m from the motor)

Selection Points

For fan/pump loads, select ordinary variable frequency motors (S1 duty cycle); for rolling mill main drives, select high-overload variable frequency motors (overload capacity 2.5 times)

For explosion-proof occasions, select Ex d IIBT4 variable frequency motors; bearings need to have grounding rings (to prevent shaft current)

2. High-voltage Motor

Technical Parameters

Voltage level: 6kV/10kV, Power range: 200-10000kW, Efficiency ≥96% (above 2000kW)

Protection level: IP55/IP65, Stator winding uses F-class insulation + corona-resistant paint, Partial discharge quantity ≤10pC

Bearings: SKF/NSK spherical roller bearings, Life L10 ≥100000 hours, with temperature sensor (PT100)

Cooling system: Air-water cooling (WICW), Inlet water pressure 0.2-0.4MPa, Water temperature ≤33℃

Selection Points

Rolling mill main motor selects doubly-fed asynchronous motor (speed regulation range 1:10), needs to be equipped with a high-voltage frequency converter cabinet

Mine ventilation fan selects explosion-proof high-voltage motor (Ex d I Mb), Junction box protection level IP66

(II) Transformers

1. Power Transformer

Technical Parameters

Capacity: 50-25000kVA, Voltage level: 10kV/35kV/110kV (high voltage side)

Winding material: All copper/copper foil, No-load loss ≤0.15% (1000kVA), Load loss ≤0.5%

Insulation class: F class/H class, Temperature rise limit: Oil-immersed ≤65K, Dry type ≤125K

Cooling method: ONAN (oil-immersed self-cooling)/AF (dry-type air-cooled), Noise ≤55dB (2m from the transformer)

Selection Points

Industrial plants select dry-type transformers (SCB14 type), Overload capacity 120%/2h, with IP20 protective shell

Outdoor substations select oil-immersed transformers (S13 type), Oil tank with capsule-type oil reservoir, Anti-oil aging

2. Rectifier Transformer

Technical Parameters

Capacity: 100-10000kVA, Voltage level: 10kV/35kV (input), 110-1000V (output)

Connection group: Dd0/Yd11, Harmonic content ≤5% (12-pulse rectification), Short-circuit impedance 4-10%

Winding material: Oxygen-free copper, Rectifier-side winding with reinforced insulation, Partial discharge quantity ≤5pC

Cooling method: ODAF (forced oil circulation air cooling), Oil pump flow rate 5-10m³/h

Selection Points

Aluminum electrolysis rectification selects 24-pulse rectifier transformer, with smoothing reactor, Power factor ≥0.95

Electroplating power supply selects low-voltage, high-current transformer (output voltage ≤50V, current ≥10000A)

(III) Switchgear

1. High-voltage Switchgear

Technical Parameters

Model: KYN28A-12/XGN15-12, Rated voltage: 12kV/24kV/40.5kV

Rated current: 630-3150A, Short-circuit breaking current: 25-40kA (RMS)

Protection level: IP4X (cabinet)/IP67 (circuit breaker chamber), Mechanical life: Circuit breaker ≥10000 times

Operating method: Electric/Manual, Energy storage motor power: 0.5-1.5kW, Switching time ≤50ms

Selection Points

Main transformer feeder cabinet selects KYN28A-12 type, equipped with VS1-12 vacuum circuit breaker (breaking capacity 40kA)

Capacitor compensation cabinet selects XGN15-12 type, equipped with load switch + fuse combination electrical appliance

2. Low-voltage Control Cabinet

Technical Parameters

Model: GGD/GCK/MNS, Rated voltage: 380V/660V, Rated current: 630-5000A

Short-circuit withstand current: 50-100kA (1s), Protection level: IP30/IP54, Cabinet material: Q235B cold-rolled steel plate (thickness ≥2mm)

Component configuration: ABB/Schneider circuit breaker, Breaking capacity ≥50kA, Contactor coil voltage AC220V/DC24V

Busbar specification: Copper busbar 100×10mm (5000A), Tin-plated surface, Insulation support temperature resistance ≥125℃

Selection Points

Motor control selects GCK drawer cabinet (good unit interchangeability), up to 18 drawers per cabinet

Frequency converter cabinet selects MNS type, equipped with independent cooling fan, Cabinet temperature ≤40℃

(IV) Cables/Slip Rings

1. High-temperature cables

Technical Parameters

Model: YGC/KGG, Rated voltage: 0.6/1kV, Temperature range: -60℃-+200℃

Conductor: Multiple tin-plated copper strands, Insulation: Silicone rubber/Fluoroplastic, Sheath: Fiberglass + Silicone rubber

Bending radius: ≥6D (D is the outer diameter of the cable), Flame retardant rating: UL94 V-0, Oil resistance: Mineral oil resistance ≥1000 hours

Shielding method: Copper wire braid (coverage ≥85%), Anti-interference attenuation ≥40dB (1MHz)

Selection Points

For kiln temperature measurement, select KGG silicone rubber cable (200℃ temperature resistance), requires double-shielded twisted pair

For high-temperature power transmission, select YGC-F46 fluoroplastic cable (260℃ temperature resistance), Insulation resistance ≥1000MΩ

2. Current collector assembly

Technical Parameters

Type: Single-pole H-type current collector, Rated current: 200-5000A, Voltage rating: 380V/660V

Conductor material: Oxygen-free copper (purity ≥99.97%), Silver-plated contact surface (thickness ≥5μm), Resistivity ≤0.0172μΩ・m

Protective housing: Engineering plastic (-30℃-+70℃ temperature resistance), Insulation resistance ≥10MΩ, Short-circuit withstand current ≥50kA (1s)

Current collector: Graphite-copper alloy carbon brush material, Wear ≤0.1mm/1000km, Contact pressure 2-3N/cm

Selection Points

For crane power supply, select 4-pole current collector (3-phase + ground), Span ≤12m, expansion section required

For high current (≥2000A), select double-pole parallel current collector, with forced cooling fan

II. Automation and Instrumentation

(1) Sensors

1. Temperature sensor

Thermocouple technical parameters

Model: K-type (nickel-chromium - nickel-silicon)/S-type (platinum rhodium 10 - platinum), Temperature measurement range: K-type -200℃-+1300℃, S-type 0℃-+1600℃

Accuracy grade: Grade A (K-type ±1.5℃, S-type ±1.5℃), Response time: ≤5s (Φ3mm protective tube)

Protective tube material: 1Cr18Ni9Ti (≤800℃)/Sapphire (≤1600℃), Pressure resistance ≤30MPa

Junction box: Explosion-proof type (Ex d IICT6), Protection grade IP65

Thermistor technical parameters

Model: PT100 (Grade A), Temperature measurement range: -200℃-+650℃, Accuracy ±0.15℃ (at 0℃)

Wiring method: Three-wire/Four-wire system, Thermal response time: ≤10s (Φ6mm protective tube)

Protective tube material: 316L (corrosion-resistant)/Hastelloy (acid-resistant), Pressure resistance ≤10MPa

Installation method: Threaded connection (M27×2)/Flange connection (DN50)

2. Pressure transmitter

Technical Parameters

Measurement range: -100kPa-+100MPa, Accuracy: 0.075 grade/0.1 grade, Stability ≤0.1% FS/year

Sensor type: Silicon piezoresistive/Ceramic capacitive, Static pressure resistance ≥1.5 times the range, Overload pressure ≥2 times the range

Output signal: 4-20mA+HART/RS485 (Modbus), Protection grade IP67, Explosion-proof grade Ex ia IIBT4

Process connection: Thread G1/2"/Flange DN25, Material 316L stainless steel, Gold-plated diaphragm (corrosion-resistant)

Selection Points

For steam pressure measurement, select high-temperature transmitter (temperature resistance ≤300℃), with condenser

For corrosive media, select Hastelloy C-276 diaphragm, Protection grade IP68 (underwater 50m)

(2) Actuators

1. Pneumatic actuator

Technical Parameters

Type: Piston type/Fork type, Output torque: 50-5000N・m, Air supply pressure: 0.4-0.7MPa

Action time: ≤5s (500N・m), Stroke deviation ≤±1%, Protection grade IP66, Explosion-proof grade Ex d IIBT6

Air source treatment: Filtration accuracy ≤5μm, Oil mist lubricator oil drop rate 1-2 drops/minute, Air storage tank capacity ≥2 times the actuator volume

Position feedback: 4-20mA, Linearity ≤±0.5%, Repeatability ≤±0.2%

Selection Points

For quick shut-off, select fork-type actuator (action time ≤3s), For adjustment conditions, select piston type (good torque linearity)

For explosion-proof occasions, select explosion-proof actuator, Air source must be dry (dew point ≤-40℃)

2. Electric actuator

Technical Parameters

Type: Multi-turn/Partial turn, Output torque: 10-10000N・m, Power supply AC380V/AC220V/DC24V

Control method: Switch type/Adjustable type (4-20mA), Positioning accuracy ≤±0.5%, Protection grade IP68 (underwater 10m)

Motor: Servo motor (power 0.1-5kW), Insulation class F, Stall protection time ≥10 minutes

Protection grade: IP68, Explosion-proof grade Ex d IIC T6, Ambient temperature -30℃-+70℃

Selection Points

Select an intelligent electric actuator (with PID control) for the regulating valve, with a dead zone ≤0.5%

For outdoor use, select IP68 protection, with a built-in heater (automatically starts when the temperature ≤5℃)

(Three) Control System

1. PLC Module

Technical Parameters

Brand: Siemens S7-1500 / Schneider M580, CPU Model: 1516TF-2PN / M580CPU556

Processing speed: ≤0.08μs / instruction (bitwise operation), Memory: 16MB-128MB, I/O points: up to 65536 points

Communication interface: PROFINET / Ethernet IP / Modbus, Protection level IP20, Operating temperature -25℃-+60℃

Expansion modules: Digital modules (DI/DO, 24V DC), Analog modules (AI/AO, 4-20mA)

Selection Points

For high-speed counting, select a module with a hardware counter (counting frequency ≥100kHz)

For motion control, select an axis control module (supports SINAMICS servo drive)

2. DCS Controller

Technical Parameters

System: Yokogawa CENTUM VP / Honeywell Experion, Controller model: FCU701 / CP400

Processing capacity: ≥10000 points / controller, Scan cycle ≤50ms, Redundancy: Triple redundancy of CPU / power supply / communication

Communication protocols: Modbus / OPC UA / MQTT, Data storage: Historical data storage ≥1 year (1000 points)

Environmental requirements: Temperature 5℃-45℃, Humidity 45%-85% RH (no condensation), Vibration resistance ≤5g (5-500Hz)

Selection Points

For large units, select a triple redundant controller (Triconex), SIL3 certified

For remote I/O, select intrinsically safe modules (Ex ia IIBT4), suitable for hazardous areas

3. Human-Machine Interface (HMI)

Technical Parameters

Screen size: 7-22 inches, Resolution: 800×480-1920×1080, Touch method: Resistive / Capacitive

Processor: Quad-core 1.5GHz, Memory: 2GB-8GB, Storage: 16GB-128GB SSD, Supports SD card expansion

Communication interface: USB / Ethernet / RS485, Supported protocols: Modbus / Profinet / EtherCAT

Protection level: Front panel IP65, Rear panel IP20, Operating temperature -10℃-+50℃, UV resistant (outdoor type)

Selection Points

For workshop operation, select a 10-inch resistive screen (operable with gloves), Brightness ≥500cd/m²

For control room, select a 19-inch capacitive screen (multi-touch), with redundant power supply input

(Four) Detection Instruments

1. Laser Thickness Gauge

Technical Parameters

Measurement range: 0.1-50mm, Accuracy: ±0.5μm (0.1-1mm), ±0.05% FS (1-50mm)

Measurement frequency: 100Hz-10kHz, Scan width: 50-1000mm, Light source: Semiconductor laser (wavelength 650nm)

Linearity: ≤±0.1%, Repeatability: ≤±0.3μm, Protection level IP54, Ambient temperature 0℃-+50℃

Installation method: Up and down opposing type, Distance from the measured object 500-1000mm, Requires constant temperature control (±1℃)

Selection Points

For cold-rolled strip steel, select a high-precision thickness gauge (accuracy ±1μm), with temperature compensation

For hot-rolled slabs, select a high-temperature thickness gauge (radiation resistance temperature ≤1200℃), with water-cooled protective cover

2. Infrared Thermometer

Technical Parameters

Temperature measurement range: -30℃-+3000℃, Accuracy: ±1% or ±1℃, Spectral response: 0.78-14μm (depending on the range)

Optical resolution: 100:1-1000:1, Response time: ≤50ms, Field of view: 20°-90°, Adjustable emissivity 0.1-1.0

Output signal: 4-20mA / USB / Ethernet, Protection level IP65, Explosion-proof grade Ex ia IIBT4

Lens protection: Sapphire lens (temperature resistance ≤500℃) / Quartz lens (temperature resistance ≤1200℃)

Selection Points

For steel melt temperature measurement, select short-wave infrared (0.78-1.1μm), strong smoke penetration capability

For motor temperature measurement, select an online infrared thermal imager (resolution 320×240), with automatic alarm function

Three, Spare Parts and Service Guarantee

Selection Support

Provide customized matching of equipment models and operating parameters (voltage / temperature / accuracy)

Provide installation drawings for electrical equipment and wiring diagrams for instruments

Quality Control

Motors are provided with no-load / load test reports, and transformers are provided with partial discharge / withstand voltage test reports

Instruments are provided with calibration certificates (traceable to national standards), and PLC modules undergo aging tests (72 hours of continuous operation)