Valve arrester: basic characteristics, types, principle of operation
Valve-type arresters are used inelectrical circuits. These devices are necessary in order to prevent atmospheric overloads. Also, gate arrester and surge arresters are able to deal with switching noise. Installed devices mainly behind insulators. The main parameters of the arresters include the voltage class and the nominal frequency.
Breakdown overload in devices is very different. If we consider stationary modifications, then the rated voltage is taken into account. It is worth an average gate arrester 15 thousand rubles.
The device and the operation principle of modifications
The standard arrester includesresistor and capacitor blocks. Discs are most often installed in the upper part of the structure. The drive blocks are of low-resistance type. Also worth noting that there are devices with special closing plates. They are quite different in pulse conductivity. Many modifications work from the module.
The principle of the gate discharger is basedon the transformation of the current. First of all, the voltage is applied to the plates. A magnetic resistor is responded by a resistor. The capacitor block passes a current through itself only in one direction. The entire conversion process takes place in the modulator. The output produces an alternating current with a frequency of at least 20 Hz.
Types of devices
By design, switching andlow-voltage devices. Tubular modifications are used in the substations. Switching devices are allocated with high frequency. At the same time, the rated voltage of the modifications is located at 300 V. Protection systems are used in different classes. Low-voltage devices are suitable for transformers of the RK series.
The operating frequency is at level 55Hz. Tubular devices are used in networks with alternating current. For transformers of the PE series, magnetic modifications are suitable. Separate category stationary devices are allocated. The nominal voltage can reach up to 340 W.
The switchgear is remarkably similar topower stations of different capacities. Disks in this case are of high conductivity. If you believe the experts, the sensitivity of the capacitor blocks reaches 30 mV. Many models use a diode block, which prevents burnout of the module.
Directly the resistors are used asrule, wave type, the lining is set to a small height. For the RK series transformers, these surge arresters do not fit uniquely. There is a qualitative modification within 14.500 rubles.
The low-voltage discharger is good because it is not afraidmagnetic interference. The drive is used for low frequency. In this case, the nominal voltage lies in the range of 100 - 200 V. Many modifications are able to boast of high conductivity and low residual voltage. It is also worth noting that the devices are well suited for transformers of the RK series.
The protection system of the arresters is used inmainly class ME40. Operating humidity is around 90%. Atmospheric overloads in this case of the electronic circuit are not terrible. For dischargers of the KE series, the dischargers are not suitable. Condenser units here are of low power. Buy a high-grade discharger user can at a price of 8 thousand rubles.
Tubular and valve arresters between each otherare similar. At substations they occur quite often. The main feature of the tubular modification lies in its low conductivity. It is also worth noting that the operating frequency lies in the range of 40-50 Hz. Many modifications are suitable for KE series transformers. Security systems are used in different classes.
The breakdown voltage, as a rule, does not exceed500 V. The operating humidity of the arrester is not more than 80%. Atmospheric overloads, they are not afraid, the body is protected perfectly. The nozzles for the devices are mainly of the combined type. Lining in this case is used quite rarely. The discs are set a short distance from each other.
Modifications with two condenser boxesare very rare. Their capacity is on average 500 microns. Quite often, the rated voltage does not exceed 450 watts. CR protection systems are rarely used. Dipole type resistors for modifications are not exactly suitable. The price for a good surge arrester ranges from 14 to 20 thousand rubles.
Models with an elongated arc
Valve arrester with elongated arccan only be used in an alternating current circuit. Many experts say that the modifications have good output conductivity. However, problems with negative polarity occur infrequently. Protection systems are mainly used in class PK40. The operating humidity of the arresters is in the region of 90%. Atmospheric overloads to these devices are not terrible.
For transformers of the RA series, these modificationsunsuitable. Speaking about the parameters, it is important to note that the nominal voltage is not very high. The maximum frequency is 66 Hz. The jaw blocks are of different conductivity. The disks are mainly installed in the upper part of the structure. The capacitor block volume fluctuates around 50 pF. To buy a high-quality discharger in a specialized electronics store can be for only 15 thousand rubles.
Features of stationary arresters
Stationary arresters can be used ontransformers series KE. Protection systems for models are used in different classes. If you believe the opinion of experts, the conductivity of them on average equals 120 microns. Quite often the devices are made with discs on the lining. Many models can boast of high sensitivity. It is also worth noting that capacitor banks are used with and without transducers. The maximum capacity is 50 pF.
For operation in a network with alternating current arrestersstationary type fit perfectly, they are not afraid of atmospheric overload. Resistors, as a rule, are of a dipole type. The voltage class depends on the modulator. Some modifications can be used on transformers of the PK40 series. Condenser boxes are of low power, but there is a filter for magnetic interference. To buy a good arrester the user is able to at a price of 30 thousand rubles.
Parameters of magnetic modifications
Magnetic arrester is produced withone or more adapters. The nominal voltage is about 500 V. Devices without filters are very rare. Indicators are only of a dipole type. In this case, the capacitor boxes are installed in different sizes. Very often, magnetic arresters are operated on low-voltage transformers. The operating frequency in this case is maintained at 50 Hz. For operation in the DC circuit, the devices are not suitable.
The parameter of the breakdown voltage is not very high. The test of the gate arresters is carried out by means of wire testers. The operating humidity of the modifications is 60%. Quite often, devices are installed on bushing insulators. Plates are attached to them both in the upper and lower parts. Buy a good discharger user can at a price of 15 thousand rubles.
Features of devices of series РВО 12
Valve arrester of this series is used fortransformer substations to prevent atmospheric overloads. The nominal voltage rating is 300 V. If experts are to be trusted, then problems with negative modulation to the device are not terrible, the dipole filter for this modification is available. If we talk about design features, experts note the low disks layout. The central adapters are located near the modulator. The capacitor box operates at a frequency of 30 Hz. Its capacity is equal to 5 pF. The breakdown voltage of the device is 500 V.
The protection system is of the class PK50. If you believe the opinion of experts, then for high-voltage transformers the device is not suitable. The switching interference of this model is not terrible. However, it is important to note that the central conductor in some cases burns out. The working humidity of the arrester is 30%. Buy a model of this series user can from 20 thousand rubles.
Characteristics of arresters RVO 10
Valve arrester RVO 10 is interesting becauseThere are two modulators. The frequency in this case is controlled by the module. The process of transformation of a surge arrester does not take much time. Most experts say that this device is very suitable for transformers of the RK series. At the same time, the protection system is of high quality, and the operating humidity is 60%. Buy a surge arrester RVO 10 user can at a price of 18 thousand rubles.
The difference between the devices series PBC 35
Valve arrester PBC operates in the circuitdirect current. The modification is suitable only for transformers of PE series. The conductivity on the disks is quite high. Also, experts say that the process of converting current does not take much time.
The condenser unit is used for high capacity. The sensitivity of the module is located at 50 mV. For the KE50 series, the modification is not suitable. The working humidity of the arrester is at the level of 60%. To buy this modification the user is able to at a price of 22 thousand rubles.
Features of devices of series РВО 40
Valve arrester of the presented series hasa lot of advantages. First of all, it should be noted that it maintains conductivity at the level of 50 microns. For tubular modifications, this is quite a lot. Also, experts say that devices are allowed to operate in AC networks. For transformers of the RK series, they fit perfectly. The threshold conductivity of the dischargers of the presented series is maintained at 55 microns.
The nominal voltage does not exceed 400B. For KE series transformers, the devices are not suitable. The condenser unit is used for large capacity. In this case, the protection system of the AK 50 class is used. The breakdown voltage of the modification is located at 430 V. The system for protection against wave interference is not provided for in the modification. The operating humidity of the arrester is 50%. Buy the model user can for 18 thousand rubles.
Characteristics of arrester arresters 10
The gate arrester arrester is used fortransformers of the RK series. Insulators for him fit only a small width. If you believe the experts' opinion, the conductivity of the discharger of this series is quite high. The nominal voltage is at the level of 450 V. At this time the switching patency is located at the level of 40 microns. The protection system of the modification is of the PE class. In an AC network, the condenser unit overheats very rarely.
To work with the transformer of the MO modificationare infrequent. The capacitance of the capacitor block is exactly 50 pF. Special attention in the device deserves a linear conductor, which fights with impulse noise. Negative modulation for him is not terrible. Separately, it should be noted that the operating humidity of the arrester is 80%. Buy it user can for 20 thousand rubles.