RU28412U1 - Device for overload protection of submersible pumps - Google Patents

Description

DEVICE FOR PROTECTING SUBMERSIBLE ELECTRIC PUMPS FROM OVERLOADS

The proposed device relates to the field of eleme: trome: aniki and can be used, for example, to protect the bi-priced submersible: centrifugal electric pumps from electric and mechanical overloads.

A device is known for thermal protection of an electric motor based on a thermal relay, where the protected electric motor is connected to a single-phase network through a normally closed 1-open contact of a PTT type thermal relay, an overview of the thermal relay and a common electric motor power wire. The relay is configured in such a way that a mechanical short circuit, or exceeding the current exceeding the permissible current, the switching on time and the pause duration ensure the steady-state thermal mode of the electric motor, not exceeding the temperature-permissible windings 13 A device for thermal protection of the electric motor is also known. taken as a prototype, containing a thermal relay connected by a winding and a normally closed contact in series with the working winding of the electric motor and the conductor, connected in series with the auxiliary winding of electric motor 1: further comprises a second thermal relay connected in series with the auxiliary winding of the electric motor, and normally closed-i contact. who is connected in series with the working winding of the electric motor 2.

Functions from inrush currents exceeding its nominal values, and can lead to excessive overheating of the stator winding and failure of the electric motor.

The task of creating the proposed technical solution is to increase the response speed of the device for thermal protection of the electric motor from currents of mechanical and electrical short circuits.

The problem is solved in that the device for protection is immersed: overload pumps, containing pa6o4j.TO and auxiliary (excitation) winding: and the electric motor and a capacitor connected in series with the excitation winding, is additionally equipped with a circuit breaker, which is connected in series with the operating and in parallel with the auxiliary by the windings of a submersible electric motor: -: a pump.

Introduction to the circuit prototype circuit breaker and the removal of two PTT thermal relays allows you to achieve your goal, which meets the criteria of a useful model, such as novelty.

Figure 1 shows a circuit diagram of a device for protecting submersible pumps from mechanical and electrical overloads.

The proposed technical solution consists of a circuit breaker 1 type VA-101 about the characteristic time sra6a.tyvany With, equal, in our case, 5 - 20 seconds. One end of the winding of circuit breaker 1 is connected to. 220 V power supply and to one of the terminals of the capacitor 2 with a capacity of 20 microfarads. The other end of the winding of the circuit breaker i is connected in series with the operating coil 3 and the field winding 4 of the electric motor. The second end of the windings - excitation 4 is connected to the second output of the capacitor 2. The common point between the RA (eyes winding 3 and winding: ohm excitation 4 of the electric motor

connected to a 220 V power supply. Capacity g: of the capacitor 2, in our case, performs the function of protecting the auxiliary winding of the electric motor from overheating, limiting the current passing through the indicated winding to a maximum of 2 amperes. Circuit breaker 1, in contrast to the PTT thermal relay used in the prototype, provides protection against mechanical and electrical short circuits, because automatic B5:: latch 1 has thermal and electromagnetic protection. O-RESISTOR O-FOR DISCHARGE OF THE CAPACITOR.

The device operates as follows.

When the moment on the motor shaft increases above the nominal, the quantity increases: through the working winding 5 and the automatic switch 1. At the same time, the thermal relay of the circuit breaker 1 is heated and when it is triggered, it disconnects the operation.6: about the winding of the electric pump. At the same time, the current in the auxiliary winding: e 4 is limited by the capacitive resistance of the sensor 2 and is 1/3 of its rated current, and its thermal mode does not turn off. When an electric short circuit occurs, the electric pump is triggered by the elec: the magnetic protection of circuit breaker 1, and the trip occurs after a few milliseconds.

The studies at the Federal Scientific Production Center-Scientific-Industrial Complex NPK (O) Energia, Voronezh confirmed the manufacturability and usefulness of the proposed device and consumer demand for it, which meets the criterion of a utility model industrially applicable.

When using 1-1I of the proposed technical solution, an increase in the response speed of the motor protection device against mechanical currents is achieved: electrical and electrical short circuits.

Claims (1)

A device for protecting submersible electric pumps from overloads, containing the working and auxiliary windings of an electric motor with a capacitor connected in series with the field winding, characterized in that it is additionally equipped with a circuit breaker connected in series with the working and parallel to the auxiliary windings of the electric motor of the submersible electric pump.