An air switch for preventing false tripping

Abstract

The present invention discloses an air switch to prevent false tripping, which belongs to the technical field of switches. It includes a main tripper, an auxiliary tripper, a temperature switch, and a signaling temperature switch; the main tripper is connected in series in the controlled circuit; the auxiliary tripper is connected in parallel with the main tripper, and the temperature switch is connected in series to the branch where the auxiliary tripper is located, and the temperature switch is a normally open contact temperature switch; the temperature sensing part of the signaling temperature switch is in contact with the main tripper, and the contact of the signaling temperature switch is connected in series with the external device signal alarm circuit. It not only overcomes the sensitivity of the existing air switch to the ambient temperature, so that the risk of false tripping in a high temperature environment is reduced to a minimum, but also can issue an early warning, so that the staff can obtain the information of possible tripping in advance, and avoid equipment accidents caused by sudden tripping.

Description

Technical Field

[0001] The invention relates to an air switch to prevent false tripping, belonging to the technical field of switches. Background Art

[0002] The air switch is one of the core components of the power supply system of the power plant, and is the basic component to ensure the normal operation of various auxiliary machines. Due to the low voltage level and many components of the power supply system, especially the air switch, its technical characteristics are rarely tested, and the detection methods are not comprehensive enough. When used in summer or hot environments, the technical characteristics of the air switch are unstable and may suddenly trip. In high temperature seasons such as summer, accidents in which important auxiliary machines lose power due to sudden false tripping of the air switch occur from time to time. If the air switch can overcome the influence of the high temperature environment, so that it does not trip in the high temperature environment, and can issue an early warning before the trend of tripping appears, it will greatly improve the reliability and economy of the power plant unit operation. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an anti-false tripping air switch, which solves the problem of false tripping without warning of the air switch in a high temperature environment.

[0004] The technical problem to be solved by the present invention is achieved by adopting the following technical solutions:

[0005] An air switch for preventing false tripping, comprising a main release, an auxiliary release, a temperature switch, and a signaling temperature switch;

[0006] The main release is connected in series in the controlled circuit;

[0007] The auxiliary release is connected in parallel with the main release, and the temperature switch is connected in series to the branch where the auxiliary release is located, and the temperature switch is a normally open contact temperature switch;

[0008] The temperature sensing part of the signaling temperature switch is in contact with the main release, and the contact of the signaling temperature switch is connected in series with the signal alarm circuit of the external device.

[0009] As a preferred example, the operating temperature of the temperature switch is 40-50° C., and the current allowed to pass through the temperature switch is not less than the rated current of the auxiliary release.

[0010] As a preferred example, the operating temperature of the signaling temperature switch is 80-120°C.

[0011] As a preferred example, the tripping current of the auxiliary release is 20-30% of the tripping current of the main release.

[0012] The beneficial effects of the present invention are:

[0013] (1) Overcoming the hidden danger of high temperature tripping: By using the auxiliary release in conjunction with the temperature switch, when the ambient temperature is high, the temperature switch is turned on, and the auxiliary release works in parallel with the main release, thus overcoming the sensitivity of the existing air switch to the ambient temperature and minimizing the risk of false tripping in a high temperature environment;

[0014] (2) Possess trip warning capability: Based on the principle of thermal tripping of air switches, the tripping process must rely on temperature. It will only trip when the temperature of the tripper reaches above 80°C. The temperature sensing part of the sending temperature switch is in contact with the main tripper. Before the temperature of the main tripper rises to close to the tripping temperature, a warning is issued in advance, so that the staff can obtain information about possible tripping in advance and avoid equipment accidents caused by sudden tripping. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention.

[0016] In the figure: main release 1, auxiliary release 2, temperature switch 3, sending temperature switch 4, controlled circuit 5, alarm circuit 6. DETAILED DESCRIPTION

[0017] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the present invention is further described below with reference to specific illustrations.

[0018] like Figure 1 As shown, an air switch for preventing false tripping includes a main release 1, an auxiliary release 2, a temperature switch 3, and a signaling temperature switch 4;

[0019] The main release 1 is connected in series in the controlled circuit 5;

[0020] The auxiliary release 2 is connected in parallel with the main release 1, and the temperature switch 3 is connected in series to the branch where the auxiliary release 2 is located, and the temperature switch 3 is a normally open contact temperature switch;

[0021] The temperature sensing part of the signaling temperature switch 4 is in contact with the main release 1, and the contact of the signaling temperature switch 4 is connected in series with the external device signal alarm circuit 6.

[0022] The operating temperature of the temperature switch 3 is 40-50°C, and the current allowed to pass through the temperature switch 3 is not less than the rated current of the auxiliary release 2.

[0023] The operating temperature of the signaling temperature switch 4 is between 80 and 120°C.

[0024] The tripping current of the auxiliary release 2 is 20-30% of the tripping current of the main release 1. The auxiliary release 2 will not interfere with the normal function of the main release 1.

[0025] Working principle:

[0026] (1) Overcoming the hidden danger of high temperature tripping: By using the auxiliary release 2 in conjunction with the temperature switch 3, when the ambient temperature is high (40-50°C), the temperature switch 3 is turned on, and the auxiliary release 2 works in parallel with the main release 1, so that the tripping current of the entire switch is increased. Therefore, a higher current is required to trip under high temperature conditions, thus overcoming the sensitivity of existing air switches to ambient temperature and minimizing the risk of false tripping under high temperature conditions;

[0027] (2) Possess trip warning capability: Based on the thermal tripping principle of the air switch, its tripping process must rely on temperature. It will only trip when the tripping device temperature reaches above 80°C.

[0028] By utilizing the temperature sensing part of the signaling temperature switch 4 to contact the main trip unit 1, an early warning is issued before the temperature of the main trip unit 1 rises to a temperature close to the tripping temperature (for example, the tripping temperature of the main trip unit 1 is 100°C, and the signaling temperature switch 4 detects that the temperature of the main trip unit 1 rises to 80°C, which triggers the signaling temperature switch 4 to issue an early warning signal), so that the staff can obtain information about possible tripping in advance and avoid equipment accidents caused by sudden tripping. The air switch in the prior art uses auxiliary contacts to send signals, and an alarm will only be issued synchronously when the switch trips, which is often too late. The present device can issue an early warning before the switch is about to trip, and can achieve an earlier early warning function that the prior art does not have.

[0029] The basic principles, main features and advantages of the present invention are shown and described above. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. An air switch for preventing false tripping, characterized in that: It comprises a main release (1), an auxiliary release (2), a temperature switch (3), and a signaling temperature switch (4); The main release (1) is connected in series in the controlled circuit (5); The auxiliary release (2) is connected in parallel with the main release (1), and the temperature switch (3) is connected in series to the branch where the auxiliary release (2) is located, and the temperature switch (3) is a normally open contact temperature switch; The temperature sensing part of the signaling temperature switch (4) is in contact with the main release (1), and the contact of the signaling temperature switch (4) is connected in series with the external device signal alarm circuit (6).

2. According to claim 1, an air switch for preventing false tripping is characterized in that: The operating temperature of the temperature switch (3) is 40-50° C., and the current allowed to pass through the temperature switch (3) is not less than the rated current of the auxiliary release (2).

3. The anti-false tripping air switch according to claim 1, characterized in that: The operating temperature of the signaling temperature switch (4) is between 80 and 120°C.

4. The anti-false tripping air switch according to claim 1, characterized in that: The tripping current of the auxiliary release (2) is 20-30% of the tripping current of the main release (1).

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