Surge arrester valve station RVS-35

RVS-35 series valve arresters are designed to protect against atmospheric overvoltage insulation of AC electrical equipment with a frequency of 50 and 60 Hz for a voltage class of 35 kV.

Specifications:

Mains voltage class, effective value, kV: 35;

Rated voltage (Unr), effective value, kV: 40.5;

Pulse breakdown voltage at pre-discharge time from 2 to 20 μs, kV, not more than: 125;

Leakage current at rectified voltage equal to the rated voltage, mA, not more than: 0.6;

Length of the outer insulation creepage distance, cm, not less than: 1256;

Conventional designation of the RVS discharger:

R - arrester;

B - valve;

C - station;

III - group in accordance with GOST 16357-83;

5 – rated discharge current of the arrester, kA;

35 - voltage class in kV;

40.5 - rated voltage in kV;

I - category of the arrester according to the length of the leakage path (20% higher than the I - th degree of pollution according to DSTU 9920-89);

U, HL - climatic version according to DSTU 15150-69;

1 - placement category according to DSTU 15150-69.

Arresters RVS-35 are made to work in networks with any neutral grounding system. Designed for long-term operation in closed and open electrical installations at ambient temperatures from minus 40° to plus 40°C and are designed for use at altitudes up to 1000 m above sea level. Despite the fact that OPN-35 surge suppressors are currently gaining more and more popularity, RVS-35 arresters still do not lose their positions and are in demand to the same extent as ten years ago.

The device and principle of operation of valve arresters

The arrester element RVS-35 consists of two main parts:

a) a multiple spark gap block, which includes several single spark gaps connected in series, shunted with horseshoe-shaped non-linear resistors designed to equalize the voltage distribution. The spark gaps are enclosed in porcelain cylinders.

b) a working resistor, made up of a set of vilite disks connected in series.

The multiple spark gap is connected in series with a working resistor, closed with a hermetically reinforced porcelain casing and compressed by a spring.

Blocks of spark gaps are located both in the upper and lower parts of the RVS-35 arrester, and vilite disks are placed in the middle between the blocks of spark gaps. This arrangement of spark gaps reduces the impulse factor of the spark gap. To obtain good contact between the blocks of spark gaps and the volite discs, they are compressed by springs. The compression springs are shunted with copper strips, which reduces their inductive reactance.

The protective effect of the arrester is due to the fact that when a voltage dangerous for the insulation appears, the spark gap of the arrester breaks down, and the pulsed current flowing through the arrester due to the non-linearity of the operating resistance does not create a voltage increase that is dangerous for the insulation.

Following the breakdown of the spark gap of the arrester, the current flowing under the action of a power frequency voltage, the so-called follow current, is interrupted by the spark gap at the first zero crossing. At the same time, the work of the arrester is completed and it is again ready for action. Spark gap - an air gap that separates the electrodes in high voltage installations. There are protective and separating spark gaps. The separating spark gap is the main element of the valve arrester, which protects the operating resistance of the arrester from the influence of the rated voltage of the installation.

The resistors R serve to equalize the voltage distribution over the spark gaps. The overvoltage wave is diverted to the ground through the working resistance, the arc of the accompanying current of industrial frequency (50 Hz) is extinguished due to its breakdown into short arcs of single spark gaps.

The separating spark gap is grouped from 2, 4, 6, etc. single spark gaps. The air gap of a single spark gap is typically about 1 mm; their number is set on the basis of: one gap per 1 kV of the rated voltage of the installation.

Vilite is widely used as a material for non-linear resistors. At low currents, the resistance Rp is large and the voltage increases linearly with increasing current. At high currents, the resistance decreases sharply and the voltage almost does not increase.

Vilite is based on SiC carborundum grains with a resistivity of about 10-2 Ohm-m. On the surface of carborundum grains, a film of silicon oxide SiO2 with a thickness of 10-7 m is created, the resistance of which depends on the voltage applied to it. At low voltages, the resistivity of the film is 104-106 Ohm-m. With an increase in the applied voltage, the resistance of the film decreases sharply, the resistance is determined mainly by carborundum grains, and the voltage drop is limited.

Working resistors are made in the form of discs with a diameter of 0.1-0.15 m and a height of (20-60) - 10-3 m. With the help of liquid glass, carborundum grains are firmly bonded to each other. Vilite is very hygroscopic. To protect against moisture, the cylindrical surface of the discs is covered with an insulating coating. End surfaces are contact and metallized.

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.

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