SU413569A1 - - Google Patents

Description

one

The invention relates to the technique of relay protection of electrical equipment of electrical stations and nodes and can be used in power systems and in plants of transforming aorostroi.

The known device for protection of trans () (armature from internal injuries, contains; its magnetic field induction sensors installed under the networks of PiTaiOHieii and connected to the executive body reacts to changing phase currents from the supply side. When closing the number of turns, the current currents practically do not differ from the normal mode currents, as a result of which this device has a low sensitivity.

Sensitivity in the proposed device, magnetic induction sensors placed 1 on the tank wall of the transformer inside, opposite the middle of the winding height of each phase, are connected via a logic circuit OR a comparison circuit comparing the absolute value of the electrical quantity with the reference one.

In such a positioning of the sensors, the latter measure the transverse component of the induction field to dissipate the corresponding winding. Since the windings of power transformers are usually B1) 1, they are filled with symmetrical

2

the height of the distribution of ampervices, then at the installation site of the sensors, the magnitude of the transverse component and the induction of the dissipation field in all possible modes is almost equal to

to zero. In the event of a short circuit, due to the symmetry of the distribution of the ammeter turns, an emf is induced in the sensor.

The drawing shows the circuit for protection of the power transformer.

Iri hover emf in sensor 1, the absolute value of this emf. after the supply through rectifier 2, it is compared with the reference voltage of the threshold element 3 and is applied to the control electrode of the thyristor 4. One of the primary windings of the output transformer 5, which performs the function of the logical element "OR.", is connected to the non-load of the thyristor. The secondary winding () of the transformer 5 is included in the control electrode of the output thyristor 7, the load of which is a switch-off solenoid or a current of the output intermediate protection relay of the power transformer.

If the value of emf. the sensor exceeds the reference voltage, the thyristor 4 opens, and a current flows through the winding 8. At the same time, on the secondary winding of the transformer, an impedance arises that opens the thyristor 7.

The closure of the solenoid 9 and the discharge under current, which leads to a disconnection of the transformer. With och k / ipchesh; 131,1K.: P1) hL (CL :: KoiiTai blocking circuit of the circuit,) 50Svra 11, and the state only with the MiiH key switch.

Bbici; i. chuv1vltel1,11stvo and G); ,, | n) .lGk1 .io .blDuiTbi, so ar; a () G:;, ShZR.olpo: and; The key is to damage the transformation of the legal and initial stage of damage and to prevent a serious accident.

4 AND REDMAST AND 3 ABOUT THIS

(different sensors of the magnetic magnetic field iol.;, n (D1chLK) chenn1) 1e to MCiio.nniTe.ii-KOMy to the organ, i l n h a iO, because, in order to increase the number 15st1; The induction lattice is located on the S1sp1ch1 (Oh, a lifespan of the transformer, iiaiipoiiii middle of high-1b1 windings each, and connected through a logic circuit "1-1Lt but a comparison circuit of the absolute value of e / 1ect () nthicor |

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