H1: XZWP-300 DC Suspension Insulator (U300B) — 300kN, 545mm Creepage, 360mm Diameter, 140kV DC Dry Withstand, 24R Coupling, Zinc Sleeve Protection, Brown/Light Gray Glaze, IEC 60383

The XZWP-300 DC Suspension Insulator (U300B) is the absolute flagship cap‑and‑pin disc insulator in our DC product portfolio, engineered for the most demanding high‑voltage direct current (HVDC) overhead transmission lines. Designed to meet the unique challenges of DC transmission — including DC ageing and electrolytic corrosion — this insulator delivers ultimate performance with its 300kN mechanical rating, 360mm diameter, and advanced DC‑optimized design for heavy pollution areas.

 

Manufactured in compliance with IEC 60383 international standards, this DC insulator features a robust porcelain body with superior characteristics to resist DC ageing. The pins are equipped with zinc sleeves to prevent DC electrolytic corrosion, ensuring long‑term reliability in HVDC applications. The unit is available in either brown (standard) or light gray (optional) glaze, both offering identical mechanical and electrical performance.

 

With a combined mechanical and electrical (M&E) failing load of 300kN — the highest in the entire DC series — a nominal creepage distance of 545mm, and a massive 360mm diameter, the XZWP-300 delivers unparalleled performance on ±400 kV to ±800 kV HVDC transmission lines in the most challenging environments. The industry‑leading 360mm diameter and 195mm spacing provide the greatest surface area for maximum pollution flashover performance and mechanical stability.

The advanced DC‑optimized shed design incorporates a specialized profile that maximizes creepage length while maintaining superior self‑cleaning properties. The porcelain material’s superior DC ageing resistance, combined with zinc sleeve protection against electrolytic corrosion and the heavy‑duty 24R coupling, ensures decades of reliable service in the most extreme HVDC applications.

 

Whether you are designing new ultra‑high‑voltage DC transmission corridors, critical river crossings, or national grid backbone interconnections requiring the highest mechanical strength and largest dimensions, the XZWP-300 DC suspension insulator offers the ultimate flagship choice for your HVDC infrastructure, with the flexibility to select your preferred glaze color.

 

H2: XZWP-300 DC Suspension Insulator — Technical Specifications (Brown & Light Gray Glaze)

The XZWP-300 DC suspension insulator is rated with a combined mechanical and electrical (M&E) failing load of 300kN — the absolute highest in the entire DC product portfolio — making it suitable for tangent suspension, light‑tension, strain, and dead‑end applications on ±400 kV to ±800 kV HVDC transmission lines where ultimate mechanical strength is required.

Its nominal creepage distance of 545mm provides superior pollution flashover performance in heavy industrial, coastal, and desert environments. The DC dry withstand voltage reaches 140kV, and the DC wet withstand voltage is 55kV. The dry lightning impulse withstand voltage is 140kV (positive) and 150kV (negative).

 

The nominal diameter is 360mm — the largest in the entire DC series — with a unit spacing (height) of 195mm — also the tallest in the series. These maximum‑in‑series dimensions provide the greatest surface area for improved pollution performance, enhanced self‑cleaning, and superior mechanical stability under the highest mechanical loads.

 

The coupling hardware is the largest 24R ball‑and‑socket type, ensuring full interchangeability with existing heavy‑duty HVDC fittings per IEC dimensional requirements. The “R” designation indicates the heavy‑duty rotary coupling design, accommodating the absolute highest mechanical loads associated with the 300kN rating.

 

The pins are equipped with zinc sleeves to prevent DC electrolytic corrosion — a critical feature for HVDC applications where standard galvanised pins would degrade due to unidirectional current flow.

 

The glaze is available in both brown (standard) and light gray (optional). All other technical parameters — mechanical, electrical, and dimensional — are identical between the two color options.

 

Every unit undergoes a routine tension load test of 150kN — the highest in the entire DC series — to verify mechanical integrity prior to dispatch. The SF₆ puncture withstand voltage reaches 210kV, demonstrating exceptional dielectric robustness.

 

H2: XZWP-300 DC Suspension Insulator — Complete Technical Data (Brown vs. Light Gray Glaze)

The following table lists all technical parameters for both glaze color options. All values are identical except for the glaze color.

Parameter	XZWP-300 (Brown Glaze)	XZWP-300 (Light Gray Glaze)
Glaze Color	Brown	Light Gray
Type Designation	XZWP-300 (U300B)	XZWP-300 (U300B)
Figure No.	2	2
Diameter D (mm)	360	360
Unit Spacing H (mm)	195	195
Nominal Creepage Distance L (mm)	545	545
Coupling Size	24R	24R
Rated M&E Failing Load (kN)	300	300
Routine Tension Load (kN)	150	150
Impact Load (N·m)	—	—
DC Dry Withstand Voltage (kV)	140	140
DC Wet Withstand Voltage (kV)	55	55
Dry Lightning Impulse Withstand (Positive) (kV)	140	140
Dry Lightning Impulse Withstand (Negative) (kV)	150	150
SF₆ Puncture Withstand Voltage (kV)	210	210
Net Weight, Approximate (kg)	16.3	16.3
Applied Standard	IEC 60383	IEC 60383

 

Note: The XZWP-300 DC suspension insulator is the flagship model in our DC series, combining the absolute highest 300kN mechanical rating with the largest 360mm diameter, the tallest 195mm spacing, and heavy‑duty 24R coupling — delivering ultimate mechanical strength, superior flashover performance, and maximum surface area for the most demanding HVDC applications. Both brown and light gray glazes offer the same outstanding performance.

 

H2: XZWP-300 DC Suspension Insulator — DC‑Specific Design Features

The XZWP-300 DC suspension insulator incorporates several advanced design features specifically developed for ultra‑demanding HVDC transmission applications that set it apart from conventional AC insulators and standard DC insulators:

• Zinc sleeve protection — The pins are equipped with zinc sleeves that prevent DC electrolytic corrosion. In HVDC applications, unidirectional current flow can cause accelerated corrosion of standard galvanised components. The zinc sleeves act as a sacrificial anode, protecting the critical pin components and ensuring long‑term mechanical integrity even at the highest 300kN loads.
• DC‑optimized porcelain material — The high‑grade porcelain body is formulated with superior characteristics to resist DC ageing. Unlike AC insulators, DC insulators are subject to continuous unidirectional voltage stress that can accelerate dielectric ageing. Our special porcelain formulation maintains consistent dielectric strength throughout the insulator’s service life.
• Advanced shed profile — The DC‑optimized shed geometry is specifically designed to maximise the 545mm creepage distance while maintaining effective self‑cleaning properties. The optimized profile enhances pollution flashover performance in heavy contamination areas where DC insulators are particularly vulnerable.
• Largest physical dimensions — The 360mm diameter and 195mm spacing — the largest in the entire DC series — provide the greatest surface area for maximum pollution performance and mechanical stability under the most extreme conditions.
• Heavy‑duty 24R coupling — The largest coupling size in the DC series, accommodating the absolute highest mechanical loads and ensuring compatibility with the most robust HVDC hardware.
• Figure No. 2 design — Featuring an advanced shed configuration for enhanced DC performance in heavy pollution areas.
• IEC 60383 compliance — Full compliance with international standards ensures global interchangeability and quality assurance.

 

Each XZWP-300 DC suspension insulator is produced from high‑grade porcelain, fired at over 1,300 °C using the wet process, achieving maximum density and near‑zero porosity. The zinc sleeves are precision‑applied to ensure optimal corrosion protection throughout the insulator’s service life.

 

The cement bonding between the porcelain body and metal parts uses high‑quality Portland cement, guaranteeing mechanical stability across extreme thermal cycling from ‑70 °C to +105 °C.

 

The hard, glossy glaze — available in brown or light gray — further enhances self‑cleaning and maintains surface integrity over decades of service. Both glaze colors are applied using the same high‑quality process, ensuring identical durability, hardness, and electrical performance.

 

H2: XZWP-300 DC Suspension Insulator — Applications and Installation

The XZWP-300 DC suspension insulator is the flagship solution for the most demanding ±400 kV to ±800 kV HVDC transmission lines, as well as ultra‑long‑span river crossings, major converter station entries, and national grid backbone interconnections where ultimate mechanical strength and the largest physical dimensions are required.

 

The 300kN mechanical rating — the absolute highest in the entire DC series — combined with the 545mm creepage distance, industry‑leading 360mm diameter, 195mm spacing, and heavy‑duty 24R coupling makes it particularly suitable for:

• ±400 kV to ±800 kV HVDC transmission lines – Where the highest reliability and ultimate mechanical strength are required for bulk power transmission over the longest distances.
• Ultra‑long‑span major river crossings – Where conductor weight and tension are at their absolute maximum, requiring the highest possible mechanical rating.
• Extreme heavy icing zones – Where ice accretion adds extreme weight and mechanical stress, requiring the highest mechanical rating in the DC series.
• Critical national grid backbone infrastructure – Where system reliability and security of supply are paramount, and maximum mechanical and pollution margins are required.
• Heavy pollution areas with extreme conditions – Industrial zones, coastal regions, and desert environments where maximum surface area and pollution performance are essential.
• HVDC converter stations – Heavy‑duty strain and dead‑end towers at converter station entries where flagship DC insulators are required.
• Ultra‑high‑voltage DC (UHVDC) projects – ±800 kV and above applications where only the largest and strongest insulators are acceptable.
• Seismic zones – Where maximum mechanical robustness is required for earthquake‑prone regions.

 

The 24R coupling with zinc sleeves ensures compatibility with existing heavy‑duty HVDC hardware and provides maximum protection against electrolytic corrosion. The DC‑optimized shed design with Figure 2 configuration facilitates hot‑stick handling for live‑line maintenance.

 

Typical application scenarios include:

• ±400 kV HVDC lines – Heavy‑duty strain and dead‑end towers requiring flagship mechanical strength and largest dimensions.
• ±500 kV HVDC lines – Ultra‑heavy‑duty applications where only the highest mechanical rating is acceptable.
• ±800 kV UHVDC lines – Ultra‑high‑voltage DC transmission where flagship insulators with the largest dimensions are mandatory.
• Major river crossings – Critical infrastructure requiring the absolute highest mechanical rating.

 

The 24R ball‑and‑socket coupling ensures compatibility with existing heavy‑duty HVDC clevis pins, yokes, and socket hardware. The DC‑specific design features — zinc sleeves, DC‑optimized shed profile, Figure 2 configuration, and special porcelain formulation — ensure maximum reliability in the most demanding HVDC applications.

 

For higher voltage requirements, multiple units of the XZWP-300 DC suspension insulator can be assembled in strings. Explore our full range of suspension insulators and transmission hardware for more options.

 

H2: XZWP-300 DC Suspension Insulator — Quality and Performance Advantages

The XZWP-300 DC suspension insulator represents the absolute flagship pinnacle of mechanical strength, physical dimensions, and DC‑specific protection in our entire DC product portfolio — the ultimate engineering achievement for the most demanding HVDC applications.

 

Key performance advantages include:

• 300kN mechanical rating – The absolute highest in the entire DC series, providing 140kN (88%) more strength than the XZP-160, and 90kN (43%) more than the XZP-210.
• 360mm diameter – The largest diameter in the entire DC series, providing the greatest surface area for maximum pollution performance and self‑cleaning.
• 195mm spacing – The tallest spacing in the entire DC series, providing enhanced mechanical stability and maximum surface area.
• 545mm creepage distance – Superior pollution flashover performance in heavy contamination environments.
• 24R coupling – The largest coupling size in the DC series, accommodating the highest mechanical loads.
• Figure No. 2 advanced shed design – Optimized for superior DC performance in heavy pollution areas.
• DC‑optimized porcelain formulation – Superior resistance to DC ageing, ensuring decades of reliable dielectric performance.
• Zinc sleeve protection – Prevents DC electrolytic corrosion, extending mechanical service life significantly.
• DC wet withstand voltage 55kV – Enhanced wet performance for reliable operation in rain, fog, and high‑humidity conditions.
• SF₆ puncture withstand 210kV — Exceptional dielectric robustness.
• 150kN routine tension load — The highest routine tension test load in the entire DC series.
• IEC 60383 compliance — Manufactured to international standards for global quality assurance.

 

At 16.3kg, the XZWP-300 offers an exceptional strength‑to‑weight ratio for a 300kN flagship DC insulator — only 2.7kg heavier than the XZP-210 (13.6kg) while delivering a 90kN (43%) higher mechanical rating, a 40mm larger diameter, and a 25mm taller spacing.

 

With an expected service life exceeding 50 years under normal HVDC operating conditions, the XZWP-300 requires minimal routine maintenance. Every unit undergoes 100% routine testing before dispatch, including:

• Visual and dimensional inspections.
• Routine tension load verification (150 kN).
• DC dry and wet withstand voltage tests.
• Porosity and temperature‑cycle prototype testing per IEC 60383.

 

Each insulator is individually foam‑cushioned and securely packed in durable wooden crates or corrugated cartons. This prevents damage during transit. We offer flexible shipping arrangements (FOB, CIF, EXW) with lead times of 15–30 days, depending on order quantity.

 

For detailed product datasheets, CAD drawings, or competitive pricing on the XZWP-300 DC suspension insulator (brown or light gray), please contact our sales team via the inquiry form below.

We also provide OEM services and complimentary technical consultation for HVDC string assembly design. For installation guidance, refer to our insulator string assembly guide.

 

H2: XZWP-300 DC Suspension Insulator — Why Choose Our Product?

Selecting the right DC suspension insulator for your HVDC infrastructure is critical to long‑term grid reliability — especially in ultra‑demanding projects where absolute maximum mechanical strength, largest physical dimensions, and ultimate pollution performance are required. Our XZWP-300 DC suspension insulator is manufactured under stringent quality control protocols at every production stage.

 

From raw material sourcing (DC‑optimized high‑grade porcelain clay) to final high‑voltage DC testing, every step aligns with IEC 60383. We understand that the most demanding HVDC transmission projects — ultra‑long‑span river crossings, ±800 kV UHVDC corridors, and national grid backbone infrastructure — require the absolute highest levels of mechanical strength, pollution performance, and DC‑specific protection that even 210kN DC insulators cannot provide.

 

That is why the XZWP-300 DC suspension insulator is specifically engineered with a 300kN mechanical rating — the absolute highest in our entire DC series — combined with the largest 360mm diameter, the tallest 195mm spacing, the largest 24R coupling, Figure No. 2 advanced shed design, zinc sleeve protection against DC electrolytic corrosion, and DC‑optimized porcelain with superior resistance to DC ageing to deliver flagship performance in the most demanding HVDC applications. Additionally, we offer both brown and light gray glaze options to match regional preferences or project specifications.

 

With over a decade of experience in porcelain insulator production — including specialized DC insulator manufacturing — we offer competitive factory pricing, prompt delivery, and dedicated after‑sales technical support.

 

Whether you require a small sample batch for project validation or a full container shipment, the XZWP-300 DC suspension insulator (brown or light gray) is available with short lead times. Contact us today to discover how the XZWP-300 DC suspension insulator can strengthen your HVDC grid reliability with its flagship combination of ultimate mechanical strength, largest dimensions, and DC‑optimized protection.

 

XZWP-300 — Key Specifications

Parameter	XZWP-300 (U300B)
M&E Failing Load	300 kN
Routine Tension Load	150 kN
Impact Load	—
Nominal Diameter D	360 mm
Unit Spacing H	195 mm
Creepage Distance L	545 mm
Coupling Size	24R
Figure No.	2
DC Dry Withstand Voltage	140 kV
DC Wet Withstand Voltage	55 kV
Lightning Impulse (+/-)	140 / 150 kV
SF₆ Puncture Withstand	210 kV
Zinc Sleeve Protection	✓
DC Ageing Resistance	✓
Net Weight	16.3 kg
Glaze Options	Brown / Light Gray
Best Application	±400kV – ±800kV HVDC (flagship / ultimate strength / largest dimensions)

 

XZP / XZWP DC Series — Complete Comparison

Parameter	XZP-160 (U160BL)	XZP-210 (U210B)	XZWP-300 (U300B)
M&E Failing Load	160 kN	210 kN	300 kN
Routine Tension Load	80 kN	105 kN	150 kN
Impact Load	10 N·m	10 N·m	—
Diameter D	320 mm	320 mm	360 mm
Unit Spacing H	170 mm	170 mm	195 mm
Creepage Distance L	545 mm	545 mm	545 mm
Coupling Size	20R	20R	24R
Figure No.	1	1	2
DC Dry Withstand	140 kV	140 kV	140 kV
DC Wet Withstand	55 kV	55 kV	55 kV
Lightning Impulse (+/-)	140 / 150 kV	140 / 150 kV	140 / 150 kV
SF₆ Puncture	210 kV	210 kV	210 kV
Zinc Sleeve Protection	✓	✓	✓
DC Ageing Resistance	✓	✓	✓
Net Weight	13.2 kg	13.6 kg	16.3 kg
Key Advantage	Standard DC strength	Maximum DC strength	Flagship DC strength + largest dimensions
Best Application	±400-800kV HVDC	±400-800kV HVDC (higher strength)	±400-800kV HVDC (ultimate strength + largest dimensions)