OPN-35 overvoltage limiter (40,5 kV and 43 kV)

Surge arrester OPN-35 is designed to protect switchgear electrical equipment from atmospheric and switching surges in electrical networks with a voltage of 35 kV AC, frequency 48 - 62 Hz with an isolated or compensated neutral. The highest long-term permissible operating voltage of surge arresters OPN-35 produced by us is 40.5 kV and 43.0 kV.

Specifications
Mains voltage class, effective value, kV - 35;
The highest long-term permissible operating voltage (Unr), effective value, kV - 40.5; 43.0;
Throughput current, A - 550;
Remaining voltage with a current pulse of 1/10 µs, amplitude of 10 kA, kV, not more than - 212.0;
Leakage distance, mm - 3400;

Protective action of the limiter OPN-35
The mains voltage is constantly applied to the connected to the network limiter. Since the limiter resistance is high (thousands of MΩ), a sufficiently small conduction current of the varistor material flows through the varistors of the column.

The principle of operation of the varistor
The value of this current for the limiter depends on the parameters of the varistor and at the highest continuous voltage UНР and temperature (20 ± 5) С it has a value of several tenths of mA.
When switching or lightning surges occur in the network, the electrical resistance of the column of varistors decreases sharply, and an overvoltage current pulse flows through the column. The current amplitude can reach tens of kiloamperes. The electromagnetic energy of the overvoltage is absorbed by the varistor, converted into heat and discharged by the limiter into the environment. Although the voltage on the protected equipment increases, it is limited to a level that is safe for the equipment. After the passage of an overvoltage wave, the limiter instantly restores its original properties. At the request of the customer, OPN-35 surge arresters can be supplied with an isolated (device) output. You can buy trip recorders JCQF-C1 10/800 (with a milliammeter) and RS-1M-2 (without a milliammeter) from us.

Surge arresters of surge arresters have a number of undeniable advantages over arresters:

  - small size and weight,

  - resistance to dirt and durability,

  - invariability of characteristics at long service life.

They differ from valve arresters in the absence of spark gaps and the material of non-linear resistors. In the ratio "price-service life, quality" OPN-35 noticeably outperforms its predecessor - RVS-35.

Design and manufacturing technology of OPN-35
The main part of this surge arrester are metal oxide varistors. Its characteristics depend on them. The voltage-related characteristics depend on the height of the column of varistors, and the current carrying capacity on their diameter. OPN-35 surge arresters of our production are manufactured in the second class of throughput, to be more precise, the throughput current is 550 amperes. This characteristic is ensured by the diameter of the varistors 46 mm. Varistors based on zinc oxide are not resistant to moisture ingress, they change their characteristics at high humidity. Proceeding from this, the body of the OPN-35 surge arrester must be sealed. The jacket of the OPN-35 surge arrester consists of two parts: a fiberglass pipe and silicon-organic rubber insulation.

From above and from below surge arrester OPN-35 is closed with aluminum flanges. The lower flange is made in the form of a support and the upper flange is made in the form of a cover. A stud is screwed into the upper flange to which a current-carrying wire is attached. The lower flange is used for supporting the apparatus in a previously prepared place. Flanges still act as a conductor.

The pipe is obtained by winding strands of glass fibers around a cylindrical mandrel. In order for the pipe to retain its predetermined shape after removal from the mandrel, it is impregnated with an epoxy binder and then dried. After drying, the pipe is removed from the mandrel and sent to the next stage of manufacturing surge arrester OPN-35.

The next step in the manufacture of the surge arrester OPN-35 is the calibration of the pipe length on a lathe and threading for the flanges. After manufacturing, the pipe is sent to the rubber pressing area. The tube is inserted into the mold die and silicon-organic rubber is fed into the mold cavity. After the pressing operation, the jacket of the surge arrester, its parts go to the assembly area of the surge arresters. There, the bottom flange is screwed to the shirt. Threaded connections are lubricated with epoxy for better reliability.

Based on the parameters of the surge suppressor, our specialists select the height of the varistor column and pass it on to the locksmiths to assemble the device. After assembly, OPN-35 surge arresters are dried and transferred to the testing area. If the devices, according to the test results, are suitable for operation, they are sent to the finished product warehouse.

We deliver orders throughout Ukraine, except temporarily occupied territories and war zones. Delivery is carried out by transport and logistics companies chosen by you.

The terms of delivery of the order depend on the availability of goods in the warehouse. If at the time of placing the order, all the selected goods are available, then we will deliver the order within a few days, depending on the remoteness of your region. If the ordered product is not in stock, the maximum delivery time of the order may be several weeks. But we try to deliver orders to customers as quickly as possible, and 90% of customer orders are shipped within the first almost immediately. In the event that part of the goods from your order did not arrive at the warehouse after the specified period during the discussion with the manager, we will definitely inform you about it.

Payment methods:

• Payment upon receipt
• Online card payment
• Non-cash settlement