RU9093U1 - DEVICE FOR CURRENT PROTECTION OF HIGH VOLTAGE CONSUMERS OF PASSENGER CARS - Google Patents

Description

DEVICE FOR CURRENT PROTECTION OF HIGH VOLTAGE CONSUMERS OF PASSENGER CARS

Technical field

The useful model refers to protection devices that are triggered when the electrical parameters deviate from the normal value and are intended for use in the electrical equipment of railway passenger cars.

State of the art

A device for differential protection of high-voltage heaters of passenger cars 1, comprising a single-wire high-voltage trunk, car body, contactor, a group of high-voltage heaters, connected in series with the make contact of the contactor and the current imbalance sensor at the input and output of high-voltage heaters of the car between the single-wire

high-voltage trunk and car body. As a current imbalance sensor, a double-winding differential reed relay is used, the first winding of which is connected between a single-wire high-voltage line and the contactor contact of the contactor, the second winding of a differential reed relay is connected between the car body and the second output of the group of high-voltage car heaters. The output of the actuating element (reed switch) of the differential reed relay is connected to the input of the intermediate actuating device, which is connected to the operational power supply circuit through a contactor winding connected in series with it.

A disadvantage of the known device 1 is that the windings of the differential reed relay have open terminals for connecting high voltage power to them, therefore, when using the differential reed relay in the electrical equipment of the car in certain climatic conditions, when condensation appears on the surface of the equipment, a short circuit occurs between the terminals, which serves cause the differential reed relay to fail. In addition, differential reed relays have insufficient response sensitivity for current imbalance and significant spread

N 01 N 83/00 N 02 N 3/00 V 60 L 3/04

operation settings, which together reduces the reliability of the device as a whole.

Utility Model Essence

The basis of this utility model is the task of creating a current protection device for high-voltage consumers of a passenger car, the design of which provides increased reliability of the device as a whole.

The solution to this problem is achieved by the fact that in the current protection device of high-voltage consumers of a passenger car, containing a single-wire high-voltage trunk, the car body, a contactor, a group of high-voltage consumers of the car, the input of which is connected through the make contact of the contactor to the single-wire high-voltage trunk, and the output - to the car body, current imbalance sensor at the input and output of high-voltage consumers of the car, an actuator that is connected in series with the contact winding According to the utility model, a current sensor based on the Hall effect with galvanic isolation between the primary (power) and secondary (measuring) circuits of the LT type with a power supply was used as the current imbalance sensor in the operational circuit, and the current sensor was passed through the passage hole as a conductor located between the closing contact of the contactor and the input of high-voltage consumers, and a conductor between the output of high-voltage consumers and the car body, while the currents in both conductors are directed river relative to each other, and the input of the power supply is connected to the operational power supply circuit of the car.

The use of a current sensor based on the Hall effect with galvanic isolation of the primary (power) and secondary (measuring) circuits as an unbalance sensor allows eliminating open high-voltage outputs of the current unbalance sensor and increasing the response sensitivity and stability of current protection. All this leads to increased reliability of the device as a whole, reduces the loss of high-voltage heaters and increases the fire safety of passenger cars.

Brief Description of the Drawings

In FIG. 1 shows a diagram of the proposed device. The positions in figure 1 are indicated:

3- high voltage consumers;

4- contactor;

4.1- winding of the contactor 4;

4.2- contactor contactor 4;

5 - current imbalance sensor (current sensor based on the Hall effect);

6- power supply unit;

7 - executive device;

8- operational power circuit.

9-hole; 10, 11 - conductors;

The best option for implementation

A current protection device for high-voltage consumers of a passenger carriage comprises a single-wire high-voltage trunk 1, a carriage body 2, and high-voltage consumers 3 of the carriage. The input of the high-voltage consumers 3 of the car through the make contact 4.2 of the contactor 4 is connected to a single-wire high-voltage line 1, and the output is connected to the body 2 of the car. A current sensor based on the Hall effect with galvanic isolation between the primary (power) and secondary (measuring) circuits of the LT type with a power supply connected to the input of its secondary circuit is used as a current unbalance sensor 5. The output of the current unbalance sensor 5 is connected to the input of the actuator 7, which with the winding 4.1 of the contactor 4 connected in series with it, is connected to the operational power supply circuit 8, the input of the power supply unit 6 is also connected to the latter. Through the passage hole 9 of the primary circuit of the unbalance sensor, the current 5 skipped as a conductor 10 connecting the high-voltage input 3 consumers make contact with carriage 4.2 contactor 4, and a conductor 11 connecting the output of high-voltage consumers carriage 3 to the body 2, the currents in the conductors 10 and 11 are directed oppositely relative to each other.

Device operation

The device operates as follows.

In the initial state, the actuator 7 is closed and when the voltage is supplied to the operative power circuit 8, the coil 4.1 of the contactor 4 is connected to the operative power circuit 8. The contactor 4, having worked, closes the contact 4.2 and the high-voltage consumers 3 of the car are turned on between the single-wire high-voltage trunk 1 and the body 2 cars. Moreover, the currents in the conductors 10 and And are equal in magnitude, but due to their counter direction in the passage

holes 9 of the primary circuit, the magnetic fields generated by currents in the conductors 10 and 11 mutually cancel each other out and the resulting magnetic field in the primary circuit is absent. Since there is no magnetic field in the primary circuit, the compensating magnetic field of the secondary circuit is also absent, therefore, there is no compensating current at the output of the current unbalance sensor 5, and the actuator 7 remains in its original state. In the event of a breakdown to the car body 2 of one of the elements of high-voltage consumers 3 of the car, for example, in t. A in FIG. 1, the current in conductor 11 becomes zero, and in conductor 10 increases. Correspondingly, the magnetic fields created in the primary circuit by currents in conductors 10 and 11 also change, and a resulting magnetic field appears, which in turn will cause a compensating magnetic field to appear in the secondary circuit, which is created by the compensating current from the power supply unit 6. Compensating current flowing through the sensor output circuit the imbalance of currents 5, will trigger the actuator 7, which in turn will cut off the voltage supply from the operational supply circuit 8 to the winding 4.1 of the contactor 4. Contactor 4, disconnected, by its contact 4.1 it will disconnect the high-voltage consumers 3 of the car from the single-wire high-voltage trunk 1, thereby ensuring their protection.

It can be seen from the above that the use of a current sensor based on the Hall effect with galvanic isolation of the primary (power) and secondary (measuring) circuits of the LT type as an unbalance sensor allows eliminating open high-voltage outputs of the current unbalance sensor and increasing the response sensitivity and stability of current protection. All this leads to increased reliability of the device as a whole, reduces the loss of high-voltage heaters and increases the fire safety of passenger cars.

Industrial applicability

Successful tests of the utility model have been carried out, serial implementation is being prepared.

Sources of information

1. "The device of differential protection of high-voltage heaters of the car. Certificate of the Russian Federation No. 3058 for a utility model, IPC P 01 P 83/14, 1996, prototype.

Claims (1)

A device for current protection of high-voltage consumers of a passenger car, containing a single-wire high-voltage trunk, a car body, a contactor, a group of high-voltage consumers of a car, the input of which is connected through a make-up contact of a contactor to a single-wire high-voltage trunk, and the output to the car body, a current imbalance sensor at the input and output of high-voltage consumers of the car, an actuator, which is connected in series with the contactor winding in the operational power circuit, characterized in that as a current imbalance sensor, a current sensor based on the Hall effect with galvanic isolation between the primary (power) and secondary (measuring) circuits with a power supply is used, and through the passage hole of the current sensor they are passed as a conductor located between the contactor contact of the contactor and the input of high-voltage consumers, and the conductor between the output of high-voltage consumers and the car body, while the currents in both conductors are directed opposite to each other, and the input of the power supply is connected to the operational power supply circuit of the car.