Technical Articles

MV Power Cabinet Trips on Transformer Load: Causes and Fixes

Bottom line first: when a medium-voltage (MV) SCR power cabinet (thyristor power cabinet / power control cabinet) trips ···

03

2026-11

Can a 200 A SCR Controller Run at Full Load? RMS Current and Margin

Bottom line first: two controllers both marked 200 A can differ sharply in continuous-load capability. What matters is w···

01

2026-11

Can One SCR Power Controller Drive Heater Tubes, MoSi2 and SiC Rods?

Bottom line first: one SCR power controller can drive electric heater tubes, MoSi2 rods and SiC rods. All three are resi···

01

2026-11

How to Choose a Sichuan SCR Power Controller Manufacturer: 7 Capability Criteria

Bottom line: when choosing an SCR power controller (power regulator / thyristor controller) manufacturer in Sichuan, do ···

01

2026-11

Can MoSi2 Heaters Run on DC? 60 V/1000 A IGBT Test

Bottom line first: MoSi2 heating elements can run on DC. A MoSi2 element is a resistive heater: heat output is set by RM···

01

2026-11

Do Power Controllers Add DC Offset? Test Data

Bottom line first: the controller output reads about 1 V DC, but that reading tracks the grid. In our bench test, the A···

26

2026-10

Zero-Cross vs Phase-Angle Harmonics: TTPR Data

Bottom line first: on a KULUN TTPR three-phase SCR power controller with the same resistive heater load, phase-angle fir···

20

2026-10

TTPR No Output: Field Troubleshooting Steps

Bottom line first: a TTPR power controller with a valid setpoint but no output usually has a wiring or setting issue. Ch···

19

2026-10

How to Adjust SCR Power Controller Output? Firing Mode to Parameters

Bottom line first: adjusting the power of an SCR power controller (also called a power regulator or thyristor power cont···

14

2026-10

Can Zero-Cross Firing Drive Transformer Loads?

Conclusion: an SCR power controller can drive a transformer load with zero-cross firing, but only if the control mode an···

13

2026-10

SiC and MoSi2 Heater Power Supply Sizing Guide

Conclusion: For SiC and MoSi2 heating, size the supply from the resistance change first, then check voltage and current.···

03

2026-10

Alarm E02 on an SCR Power Controller: 8 Fix Steps

Bottom line first: alarm E02 first means the SCR power controller has detected phase loss in the main-circuit input supp···

01

2026-10

Silicon Carbide Heating Power Supply Selection Guide

Bottom line first: the difficulty of selecting a power supply for silicon carbide (SiC) heating is not "being able to ad···

01

2026-10

SCR Controller Reads 190 V with No Load? Why

Bottom line first: when an SCR power controller (thyristor power regulator) is not given a command and not running, meas···

30

2026-09

AC vs DC Heating: Differences and Power Supply Selection

Bottom line first: AC and DC are equally capable of generating heat — in a resistive load, if the RMS voltage is the sam···

26

2026-09

3 kV, 6 kV or 10 kV? HV Cabinet Voltage Class Guide

Bottom line up front: 3 kV, 6 kV and 10 kV are not performance grades — they are matching grades. The voltage class of a···

23

2026-09

Thyristor Voltage Sharing: Static Grading vs RC Snubber

Conclusion: Thyristors connected in series do not share voltage by themselves — differences in leakage current, junction···

23

2026-09

How to Select a High-voltage Power Control Cabinet

Bottom line up front: selecting a high-voltage power control cabinet does not start with the price tag. It starts with 8···

23

2026-09

SCR Cabinet Cooling: Heat Load, Airflow and Ducting

Conclusion: SCR cabinet cooling is sized in four steps: estimate the heat load with the 2 V rule, convert it into requir···

22

2026-09

MoSi2 Heating: SCR vs Layered SCR vs IGBT DC

Conclusion: MoSi2 rod heating needs a supply that covers a wide resistance swing and limits cold-start current. Three sc···

05

2026-09

APR3 Smart Power Distribution for Staggered SCR Control

Conclusion: Multiple SCR power controllers doing zero-cross control at the same time add up to a fluctuating bus current···

04

2026-09

SCR vs IGBT Power Supplies: What Are the Differences?

Conclusion: The real difference between SCR and IGBT power supplies is how they regulate and how fast they respond. SCR ···

13

2026-08

How to Choose a DC Power Supply for a Submerged Arc Furnace

Conclusion: Selecting a DC power supply for a submerged arc furnace starts with the furnace type and electrode arrangeme···

04

2026-08

How to Select an SCR Power Controller: Selection Checklist

Conclusion: Choose an SCR power controller from the load first — single-phase or three-phase, and whether the load is re···

04

2026-08

12-pulse Rectifier Harmonics: 6 kV/3 MW DC Supply

Conclusion: A 12-pulse rectifier cancels the 5th and 7th harmonics that dominate a 6-pulse unit, leaving the 11th and 13···

03

2026-08

SCR Controller Blowing Fast Fuses? APR3 Troubleshooting

Conclusion: A controller that keeps blowing fast fuses at high opening is not fixed by fitting a larger fuse. The usual ···

31

2026-07

TTPR SCR Power Controller: Load, Current and Cooling

Conclusion: the TTPR is KULUN Electric's standard three-phase power regulator, commonly used for three-phase load power ···

30

2026-07

APR3 SCR Power Controller for Industrial Furnace Heating

Conclusion: The APR3 is KULUN Electric's three-phase SCR power controller for industrial furnace heating, covering phase···

30

2026-07

SCR Power Controller vs VFD: Heating Control or Motor Speed?

Conclusion: An SCR power controller regulates voltage to a heater; a VFD regulates frequency and voltage to a motor. Use···

24

2026-07

Thyristor Controller for MoSi2 and SiC Heaters

Conclusion: A thyristor controller (also called a thyristor power unit or SCR power controller) for MoSi2 and SiC heater···

24

2026-07

Can SCR Controllers Accept 4-20 mA / 0-10 V?

Conclusion: industrial power regulators (SCR controllers) usually support 4-20 mA, 0-10 V, digital input or communicatio···

24

2026-07

Constant-power SCR Controllers: Feedback, Loads and Limits

Conclusion: Constant-power control on an SCR power controller only works if the controller measures true active power. P···

24

2026-07

Single-phase vs Three-phase SCR Controllers

Conclusion: Single-phase or three-phase is decided by how the load is connected to the supply, not by the power rating a···

24

2026-07

SCR Controller Current Sizing: Three-phase Load Calculation

Conclusion: Size an SCR controller from the load's active power, supply voltage and power factor — not from nameplate cu···

24

2026-07

Bipolar DC Power Supply: Two Commutation Topologies

Conclusion: A bipolar DC power supply reverses its output polarity on a set program; that reversal is called commutation···

22

2026-07

Synchronous Rectification: Low-voltage High-current Uses

Conclusion: Synchronous rectification replaces diode rectification with controlled devices, cutting the rectifier drop f···

22

2026-07

SCR, Thyristor Controller or Power Regulator: Name Guide

SCR Power Controller, Power Regulator, Thyristor Controller — What’s the Difference?Conclusion: SCR power controllers, p···

22

2026-07

What Changed in the Second-Generation SCR Power Controller?

Conclusion: four things changed in the second generation — a slim body, custom-molded heatsink and housing, an upgraded ···

15

2021-07