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Anonymous users2024-02-12The most commonly used is composite voltage lock-up overcurrent protection.
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Anonymous users2024-02-11The main protection of the transformer is gas protection and differential protection. A fallback is a fallback to the primary protection. For the incoming lines, important electrical equipment and important lines of transformers and power distribution stations, in addition to the main protection, backup protection and auxiliary protection are also installed, and the backup protection is divided into near backup protection and far backup protection.
1. The protection that reflects the amount of gas and the oil flow speed at the time of failure is called gas protection. When the internal fault of the transformer occurs, the local high temperature at the fault point increases the oil temperature of the transformer, the volume expands, and the air in the oil is discharged and shielded to form a rising gas.
2. The transformer differential protection is composed according to the principle of circulating current, which can correctly distinguish the internal and external faults of the transformer, and can instantaneously remove the faults in the protected area.
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Anonymous users2024-02-101.The main protection refers to the stability of the Manxiang Zaozu system and the safety requirements of the equipment, which can selectively remove the protected equipment and the protection of the whole line fault. Such as: differential protection of transformers, high-frequency protection of lines, etc.
2.Back-up protection refers to the protection used to remove faults when the main protection or switch refuses. Back-up protection can be divided into two modes: far backup and near backup.
3.Auxiliary protection is a simple protection that is added to supplement the deficiencies of primary and backup protection. For example, the current quick break protection is used to speed up the removal of faults or to eliminate dead zones of directional elements.
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Anonymous users2024-02-09Depending on the size of the power transformer, the protection used in it is also different.
Generally, the main protection used in larger capacity transformers is:
Gas protection, when it has the function of on-load pressure regulation, includes two parts: on-load gas and on-load gas. Generally, the heavy gas action is tripping, and the light gas reports the signal.
Longitudinal differential protection of transformer generally adopts three-phase type.
Backup protection includes: over-current protection, over-current protection with macro lock-out in the dry voltage start-up of composite electric finger line, negative sequence over-hole current protection, zero-sequence current protection, temperature protection, etc.
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Anonymous users2024-02-08Hello dear and happy to answer your <>
The main protection and backup protection transformer of Qinqin transformer are stationary equipment with continuous operation, which is more reliable in operation and has fewer failure opportunities. However, due to the fact that most of the transformers are installed outdoors and are affected by the load bearing during operation and the impact of short-circuit faults in the power system, various faults and abnormal situations can be avoided during operation. Internal faults refer to the faults that occur inside the casing, including the phase-to-phase short-circuit fault of the winding, the turn-to-turn short-circuit fault of the one-phase winding, the short-circuit fault between the winding and the iron core, and the disconnection fault of the winding.
External faults refer to various interphase short-circuit faults between the external lead wires of the transformer, and single-phase grounding faults that occur when the insulating sleeve of the lead wire flashover through the box shell. Transformer failure is very harmful. Especially in the event of an internal fault, the high-temperature arc generated by the short-circuit current will not only burn out the insulation and core of the transformer winding, but also cause the transformer oil to be cracked by the hydrothermal liquid to produce a large amount of gas, causing the deformation of the transformer shell or even ***.
Therefore, when a transformer fails, it must be removed. The abnormalities of the transformer mainly include overload, oil level reduction, over-bright buried current caused by external short circuit, excessive oil temperature of the transformer in operation, excessive winding temperature, excessive pressure of the transformer, and cooling system failure. When the transformer is in an abnormal operating state, an alarm signal should be given.
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Anonymous users2024-02-07Summary. What are the setting parameters of the relay protection of the power transformer: the main technical data of the transformer are generally marked on the nameplate of the transformer under the specified use environment and operating conditions.
It mainly includes: rated capacity, rated voltage and its tapping, rated frequency, winding coupling group and rated performance. 2.
Five major classifications of transformers: power transformers At present, the representative products that have been operating in the system include: 1150kV, 1200mV·a, 735 765kV, 800mV·a, 400
Distribution transformerDistribution transformer refers to the transmission of AC voltage and current in the distribution system according to the law of electromagnetic induction.
Hello. What are the setting parameters of the relay protection of the power transformer: the main technical data of the transformer are generally marked on the nameplate of the transformer under the specified use environment and operating conditions.
It mainly includes: rated capacity, rated voltage and its tapping, rated frequency, winding coupling group and rated performance. 2.
Five major classifications of transformers: power transformers At present, the representative products that have been operating in the system include: 1150kV, 1200mV·a, 735 765kV, 800mV·a, 400
Distribution transformerDistribution transformer refers to the transmission of AC voltage and current in the distribution system according to the law of electromagnetic induction.
50Hz, 220V 60W bulb, 270mA current, series into the transformer winding, even if the transformer's own other windings have been short-circuited, or artificially short-circuited other windings, according to the transformer electromagnetic principle, the primary current emergency increases dramatically, but due to the current limiting effect of the 60W bulb (270mA), will it heat up? In addition, the winding of the high-frequency switching transformer working above 40kHz, for the 50Hz alternating current frequency, its inductive reactance is very small, far less than the impedance of the bulb, which is similar to the DC impedance, and the result is; The bulb is always on, the transformer is slightly cool, because of the theoretical analysis, I have not used this method, for reference, I use the boiling method, I hope to really practice the peer correction, similar methods, commonly used in electrician maintenance, for the power frequency transformer, the motor winding is added to the low-voltage alternating current heating up and softening and removal,
1. The primary voltage is generally 110kV alternating current, and the discharge distance between such a high voltage and the human body in a dry environment is generally about 1 meter to meter, so as long as you have enough distance from it, there is no danger. Let me talk about magnetic radiation, the transformer has a certain amount of radiation, these radiation is actually some electromagnetic waves emitted by the coil in the transformer, but the shell of the transformer has a shielding effect, so these will not cause any harm to the person. >>>More
1. First of all, know how big is your load? Usually the capacity range of the transformer is specified in the regulations, if your load is a 450kw motor, then you choose a 630kVA distribution transformer is enough, such a small capacity transformer 10kV power supply is enough. >>>More
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If your electrical equipment is not compensated on the spot, you must have a capacitor cabinet as a centralized compensation, if there is no both, the system power factor will be too low, and the line consumption will increase, on the other hand, the power factor is lower because of too much reactive power drawn from the grid), the power supply company will also be fined. >>>More