PRODUCT LIST:

Dropout Fuse Cutout

Standardized fuse cutout
ABFCO121 fuse cutout
ABFCO122 fuse cutout
ABFCO123 fuse cutout
ABFCO124 fuse cutout
ABFCO125 fuse cutout
300A & 400A fuse cutout
Load break fuse cutout
Wind-resistant fuse cutout
Fuse Cutout Fittings – Brass Casting
Fuse Cutout Fittings – Stamped parts
Fuse Cutout Fittings – Fuse Links
Fuse Cutout Fittings – Other Accessories

Surge Arrester

Low voltage surge arrester
Distribution surge arrester
Polymer surge arrester
Anti pollution surge arrester
Pillar surge arrester
Station surge arrester
Capacitive surge arrester
Line type surge arrester
Dropout surge arrester
Arrester disconnection, time, online monitor

Disconnecting Switch

ABG1 disconnecting switch
ABG2 disconnecting switch
ABG3 disconnecting switch
ABG4 disconnecting switch
GW1 disconnecting switch
GW4 disconnecting switch
GW5 disconnecting switch
Low voltage disconnecting switch

Insulator

Suspension insulator
Pin insulator
Post insulator
Cross arm insulator
Other insulator
Insulator hardware

Wall Bushing

Composite dry wall bushing
Porcelain wall bushing

Insulating Protection Cover

Abimat Electric

ADDRESS: Deyu Road 5, Xiangyang Industry District, Yueqing City, Zhejiang Province, China
Email: info@abimat-electric.com
Wechat: 18368780285

33 kV Polymer Pin Insulator: A Technical Overview

ⅠIntroduction

A Medium Voltage Disconnect (MVD) switch is a very important mechanical switching device. It’s made to safely isolate circuits in electrical power systems—usually for voltages between 1kV and 38kV. Its main job is to give a reliable, easy-to-see way to make sure a circuit is isolated. People need this for fixing, maintaining, or changing how the system works. This keeps workers safe and stops equipment from accidentally turning on.

MVD switches aren’t like circuit breakers. They aren’t made to stop faulty currents or heavy load currents. You use them only when another protective device—like a circuit breaker upstream—has already turned off the circuit’s power. One key thing about how MVD switches are built: there’s a clear air gap between their contacts when they’re open. This gap gives a physical, sure way to know the circuit is isolated. Lockout/tagout steps depend on this important safety feature.

Ⅱ What It’s Made Of and Key Parts

The insulator has a strong design with several important parts:

One part is the Silicone Rubber Housing/Skirts. This is the outer polymer cover. It’s made from High-Temperature Vulcanized Silicone Rubber. It has good water-repelling ability—this stops water from forming a thin film on its surface. That reduces the small current that leaks out and makes it work better when there’s pollution. The skirt design also makes the “creepage distance” longer (that’s the distance electricity has to travel along the insulator’s surface). For 33kV units, this distance is usually 1330mm. It helps stop electricity from jumping over the surface (called flashover).

Another part is the Fiberglass Epoxy Resin Core Rod. This is the central part. It’s strong enough to hold the weight of the power conductor and handle mechanical loads. The core rod is usually very tough, with a set “breaking load” (how much force it can take before breaking).

The third part is the Metal Fittings. These are made from forged steel. They include parts like pins or sockets—they connect the insulator to the support structure and the power conductor. The “pin-type” design is common. It makes it easy to install on the cross-arms of power poles. You need to seal the spot where the core meets the metal well. If moisture gets in there, it can cause the insulator to break completely.

Ⅲ Why It’s Better Than Porcelain

33kV polymer pin insulators have several good points for daily use:

One plus is better water-repelling ability. The silicone rubber surface pushes water away. Moisture forms small drops instead of a film. This reduces the small leaking current, cuts down on “dry-band arcing” (small sparks on dry spots), and lowers the chance of flashovers caused by pollution. This is especially useful in coastal areas or places with lots of industry.

Another plus is that it’s light and hard to damage on purpose. Polymer insulators are much lighter than porcelain ones. That makes them easier to move and install. They’re also mechanically strong and don’t shatter. So they’re hard to damage when you handle them or if someone tries to vandalize them.

A third plus is good performance against pollution. The water-repelling ability plus the specific shape of the skirts makes these insulators work well in places with heavy pollution, salt fog, or industrial dirt. They keep working reliably even in those conditions.

Ⅳ Key Technical Specs

For a 33kV system, the insulator usually has these specs:

One is Rated Voltage—it’s 33 kV.

Another is Rated Mechanical Load—it’s 12.5 kN (that’s a unit of force).

Then there’s Lightning Impulse Withstand Voltage—it’s 260 kV. This is how much voltage from lightning it can handle.

Next is Power Frequency Wet Withstand Voltage (1 min)—it’s 130 kV. This is how much regular voltage it can handle for one minute when it’s wet.

Last is Nominal Creepage Distance—it’s 1330 mm.

These specs make sure the insulator works reliably under normal system voltage, temporary high voltages, and lightning surges.

Ⅴ Standards and Testing

Polymer insulators have to follow international standards—like IEC 62217. These standards say how to test the insulators and what results count as good. Important tests are:

One test is Electrical Tests. These include the power frequency wet withstand voltage test and the lightning impulse withstand voltage test. They check if the insulator’s insulation is strong enough under different high-voltage conditions.

Another test is Mechanical Tests. These make sure the insulator can handle the specified pulling force and twisting force.

A third test is Material and Ageing Tests. These check things like how well the material resists tracking (small electrical paths) and erosion, if the water-repelling ability spreads to dirty parts, and how it works after being tested to simulate long-term use.

Ⅵ Conclusion

The abimat 33 kV polymer pin insulator is a very reliable and useful option for modern medium-voltage overhead power distribution networks. It has advantages like being light, working well against pollution, and proving to be reliable over time. That’s why power companies around the world prefer it—it helps make the power grid stronger.