CN204783773U - Diesel locomotive's brake resistance high temperature protection device - Google Patents

Abstract

The utility model belongs to a braking resistor high-temperature protection device for a diesel locomotive, and is characterized in that it at least includes a bridge (2) composed of four resistors, wherein a bridge arm resistor of the bridge (2) is a braking resistance; the output voltage U2 of the bridge (2) is given according to the following formula: U2=R0(R2+R3)(U1/(R0+R1))/(R0+R1+R2+R3)-R2( R0+R1)(U1/(R2+R3))/(R0+R1+R2+R3), in the formula, R0 is the braking resistor. The brake resistance high temperature protection device of the diesel locomotive can directly respond to the temperature of the brake resistance, and has the advantages of high reliability and fast temperature response.

Description

A braking resistor high temperature protection device for a diesel locomotive

technical field

The utility model belongs to a braking resistor high-temperature protection device for an internal combustion locomotive, and is especially suitable for a braking resistor device with a large temperature coefficient of resistance.

Background technique

At present, there are two ways to protect the braking resistor device, one is wind loss protection for fans, one braking resistor for each locomotive, and the other is differential speed protection for fan speed, two braking resistors for each locomotive. Both protections detect the motor speed of the braking resistor through the speed sensor, and then perform differential speed protection or wind loss protection through the microcomputer system. The above method of detecting the speed of the brake resistor motor through the speed sensor to protect the resistance is all indirect temperature measurement, one is that there is an error, and the other is that the response time is slow.

Contents of the invention

The purpose of the utility model is to provide a braking resistor high temperature protection device for a diesel locomotive that can directly respond to the braking resistor temperature, has high reliability and fast temperature response.

The technical solution of the utility model is to provide a braking resistor high temperature protection device for a diesel locomotive, which is characterized in that it includes at least one bridge composed of four resistors, wherein one bridge arm resistor of the bridge is a braking resistor.

The bridge output voltage U2 is given according to the following formula:

U2=R0(R2+R3)(U1/(R0+R1))/(R0+R1+R2+R3)-R2(R0+R1)(U1/(R2+R3))/(R0+R1+R2 +R3), in the formula, R0 is the braking resistor.

The bridge output is electrically connected with a measurement amplifier.

The R0 mentioned above is the resistance value of the braking resistor.

The braking resistor is connected to the bridge circuit through a copper bar.

The utility model has the advantages that the braking resistor is applied to the bridge circuit to realize high temperature protection.

The utility model takes a section of resistance R0 on the belt of the braking resistor device, and leads it to the outside with a copper bar, forms a bridge circuit with R1, R2, and R3 outside the resistor cabinet, and when the resistor device works normally, U2 outputs The voltage value is a range value, which can be given according to the calculation formula. When the temperature of the resistance device is higher than the design working temperature, the resistance value of the resistor R0 will also increase, and the output voltage value U2 will also increase.

The output voltage value is defined as a safe value at normal temperature. When the temperature of the resistance band exceeds the design maximum temperature, the output voltage value is transmitted to the locomotive microcomputer control system as an alarm signal, and the locomotive microcomputer control system takes protective measures.

Below in conjunction with embodiment accompanying drawing, the utility model is described further.

Description of drawings

Fig. 1 is the electrical schematic diagram of the utility model embodiment;

Fig. 2 is a circuit detection principle diagram of the embodiment of the utility model.

In the figure, 1. Constant voltage source; 2. Bridge circuit; 3. Measurement amplifier; 4. Copper bar; 5. Controller.

Detailed ways

Example 1

As shown in Figure 1, a braking resistor high temperature protection device for a diesel locomotive is characterized in that it includes at least one bridge 2 composed of four resistors, wherein a bridge arm resistor of the bridge 2 is a braking resistor R0.

The output voltage U2 of the bridge circuit 2 is given according to the following formula:

U2=R0(R2+R3)(U1/(R0+R1))/(R0+R1+R2+R3)-R2(R0+R1)(U1/(R2+R3))/(R0+R1+R2 +R3), in the formula, R0 is the braking resistor. The R0 mentioned above is the resistance value of the braking resistor. The braking resistor is connected to the bridge 2 through the copper bar 4.

Example 2

As shown in Figure 2, a braking resistor high temperature protection device for a diesel locomotive includes at least a bridge 2 composed of four resistors, wherein a bridge arm resistor of the bridge 2 is a braking resistor; the R0 is Brake resistor section resistance; brake resistor is connected to the bridge circuit through the copper bar 4, the power supply terminal of the bridge circuit 2 is electrically connected to the constant voltage source 1; the output terminal of the bridge circuit 2 is electrically connected to the input terminal of the measuring amplifier 3, and the measurement The output terminal of the amplifier 3 is electrically connected to the control input terminal of the controller 5, and the voltage U2 at the input terminal of the measuring amplifier 3 is given according to the following formula:

U2=R0(R2+R3)(U1/(R0+R1))/(R0+R1+R2+R3)-R2(R0+R1)(U1/(R2+R3))/(R0+R1+R2 +R3), in the formula, R0 is the braking resistor.

The utility model takes a section of resistance R0 on the brake resistance device belt, and leads it to the outside with the copper bar 4, and forms a bridge circuit with R1, R2, and R3 outside the resistance cabinet. When the resistance device works normally, U2 The output voltage value is a range value, which can be given according to the calculation formula. When the temperature of the resistance device is higher than the design working temperature, the resistance value of the resistor R0 will also increase, and the output voltage value U2 will also increase at this time.

Claims (6)

1. a braking resistor high temperature protection device for internal combustion locomotive, is characterized in that: at least comprise a bridge road (2) be made up of four resistance, an arm resistance on its jackshaft road (2) is braking resistor.

2. the braking resistor high temperature protection device of a kind of internal combustion locomotive according to claim 1, is characterized in that: the output voltage U2 on described bridge road (2) provides according to following formula:

U2=R0 (R2+R3) (U1/ (R0+R1))/(R0+R1+R2+R3)-R2 (R0+R1) (U1/ (R2+R3))/(R0+R1+R2+R3), in formula, R0 is braking resistor.

3. the braking resistor high temperature protection device of a kind of internal combustion locomotive according to claim 1, is characterized in that: described bridge road (2) exports and is electrically connected with measuring amplifier (3).

4. the braking resistor high temperature protection device of a kind of internal combustion locomotive according to claim 2, is characterized in that: described R0 is braking resistor one section of resistance.

5. the braking resistor high temperature protection device of a kind of internal combustion locomotive according to claim 2, is characterized in that: described braking resistor is connected to bridge road (2) by copper bar (4).

6. the braking resistor high temperature protection device of a kind of internal combustion locomotive according to claim 2, is characterized in that: the power end on described bridge road (2) is electrically connected with [constant (1).