Business License
Contact Us
Your inquiry content must be between 10 to 5000 characters
Please enter Your valid email address
Why do transformer cores need to be grounded? And it can only be grounded at one point, not at two p
1、 Why must the iron core be grounded?
The transformer core is made of stacked silicon steel sheets and is located in a strong alternating magnetic field. There is insulation between the iron core, winding, and oil tank, which induces a floating potential during operation. If not grounded: The potential of the iron core is uncertain, and high voltage may accumulate. When the potential difference exceeds the insulation tolerance value, ground discharge (spark discharge) will occur. Repeated discharge will erode the iron core, damage the insulation, and ultimately lead to a fault. Therefore, it is necessary to reliably ground the iron core to fix the potential at ground potential (0V) and eliminate the risk of floating discharge.
2、 Why can only one point be grounded, not two or more points?
The iron core itself is a good conductor. If two or more points are grounded, a closed conductive circuit will be formed between them and the ground. The consequences are very serious: there is a strong alternating magnetic flux around the transformer, which will cut the magnetic field lines and induce a large circulating current. This will cause severe heating of the iron core, local melting and insulation aging of the silicon steel sheet, and even transformer fire and explosion. Simple understanding: two-point grounding=formation of short circuit turns=huge eddy currents=iron core burning
3、 In summary, iron core grounding: prevents floating potential from breaking through insulation and causing discharge damage. Only one grounding point can be used: to avoid the formation of a closed circuit and the generation of circulating current, and to prevent the iron core from overheating and burning out.
Recently Posted
-
Jinhua Dika Electrical Equipment: Manufacturing Transformers and Switchgear in Zhejiang, China
August 31, 2026When a buyer starts looking for a transformer or a complete switchgear set, the hardest part is often not the specification. It is
Read More -
Environmentally friendly gas insulated 40.5kV switchgear
August 31, 2026There are two types of 40.5kV environmentally friendly gas insulated switchgear: one is used for ring network power supply, with l
Read More -
The use of heat shrink tubing
August 31, 2026For the use of heat shrink tubing, foreign customers accept it as an insulation medium. According to the requirements of RAYCHEM 2
Read More -
American standard 38kV metal armored outdoor switchgear
August 31, 2026The power frequency withstand voltage of the 38kV switchgear is 80kV, and the lightning impulse withstand voltage is 150kV. For me
Read More
Contact Us
Recommended Products
-
Single Phase Oil Immersed Transformer 10KVA 15KVA 25KVA 37.5KVA Standard CompliantNegotiableMOQ: 2 Units -
Electrical Arc Furnace Transformers up to 120MVA - Certified for Steel Industry ApplicationsUS$ 8000 - 10000MOQ: 1 Unit
-
3-Phase Oil Type Transformer 5-Year Warranty With Load Test ReportUS$ 5428 - 5628MOQ: 1 Unit
-
Three Phase Oil Filled Transformer for Mining Operations Dust-Proof DesignUS$ 5428 - 5628MOQ: 1 Unit
-
HV Three Phase Oil Filled Transformer With ONAN Cooling 500kVA-2500kVAUS$ 5428 - 5628MOQ: 1 Unit
-
11/24/33KV High Voltage Isolation Switch With Mill Test ReportUS$ 800MOQ: 1 Unit
-
3-Pole Outdoor Isolation Switch With 5-Year Warranty and Compliance TestingUS$ 800MOQ: 1 Unit
-
YH5WZ 3KV-110KV Zinc Oxide Arrester for Power Station Outdoor High Voltage DistributionUS$ 21MOQ: 100 Units
-
Outdoor SF6 Load Break Switch LW30-72.5/1250A 24KV 630A 16KA Three PhaseUS$ 10000MOQ: 1 Unit
-
Input Line Reactor for CNC Machine Frequency Converters, 400V 60HzUS$ 65MOQ: 5 Units
-
Industrial Grade 35-220KV Oil-Immersed Current Transformer for SubstationsUS$ 480 - 500MOQ: 3 Units
-
LZZBJ9-20 Indoor 24kV High Voltage Cabinet Single-Phase 5-20 for Industrial Power SystemsUS$ 250MOQ: 3 Units
-
17.5 KV Full-enclosed Outdoor Epoxy Resin Casting and Double Pole Insulated Voltage TransformerUS$ 90 - 100MOQ: 1 Piece
-
Three Phase 30kVA SVC Voltage Regulator for Textile Manufacturing, Stable OutputUS$ 159MOQ: 10 Units
-
Amorphous Core 25kVA Transformer Compliant With IEC Standards for Power DistributionUS$ 1300 - 2900MOQ: 2 Units
-
CHINT NM8NDC-630 DC 1000V/Ui High-Voltage Circuit Breaker With 630A Frame CurrentUS$ 425 - 625MOQ: 100 Units
-
High Voltage Drop Out Fuse Cutout 33KV 27KV 24KV for Overhead LinesUS$ 35MOQ: 100 Units
-
TVR-10 KVA Automatic Voltage Stabilizer 220V ±0.5% Accuracy for Laboratory InstrumentsUS$ 103 - 123MOQ: 1 Unit
-
Universal 5000VA Voltage Transformer for International Appliances 110V-220VUS$ 102 - 107MOQ: 10 Units
-
500kV Three-Phase Oil-Immersed Auto Transformer 250MVA for Power GridsUS$ 800 - 9000MOQ: 1 Unit
