Density meter real-time compensation device and compensation method thereof

Abstract

The invention relates to a density meter real-time compensation device and a compensation method thereof. The density meter real-time compensation device is characterized by comprising a density relay, a temperature acquisition control module and a motor transmission module, the influence temperature of direct solar radiation on the density relay is collected, the adjusted temperature is set in advance, and when the influence temperature of direct solar radiation on the density relay exceeds a set value, the angle of the density meter is adjusted in time, so that the density meter is compensated, and the reading accuracy is ensured; false alarm of the density relay is avoided, so that the reliability of product operation is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breakers, and in particular to a density meter real-time compensation device and a compensation method thereof. Background Art

[0002] SF6 density relay is an important protection and control device used in power systems. If a circuit breaker fails, it will cause great economic losses. To ensure the reliability of circuit breaker operation, it is necessary to monitor various indicators of the circuit breaker regularly.

[0003] The SF6 gas in the SF6 circuit breaker is sealed in a fixed container. At the rated pressure at 20°C, it has a certain density value. Within the various allowable conditions of the circuit breaker operation, although the pressure of the SF6 gas changes with the temperature, the density value of the SF6 gas remains unchanged. Because the insulation and arc extinguishing performance of the SF6 circuit breaker depends to a large extent on the purity and density of the SF6 gas, it is particularly important to detect the purity of the SF6 gas and monitor the density. If an ordinary pressure gauge is used to monitor the leakage of SF6 gas, it will be difficult to distinguish whether the pressure change of the SF6 gas is caused by a real leakage or a change in the ambient temperature. In order to achieve the purpose of regular density monitoring, the national standard stipulates that the SF6 circuit breaker is equipped with an SF6 density relay, which plays a control and protection role.

[0004] Temperature compensation function of SF6 density relay: converting the pressure value at different temperatures into the pressure value at 20℃ is temperature compensation. Since the pressure of sealed gas will change with temperature if the volume remains unchanged, but the density does not change with temperature, the influence of temperature must be eliminated, that is, temperature compensation.

[0005] Since the temperature sensing device of the SF6 density relay is inside the instrument, the key condition for temperature compensation is that the temperature of the instrument should be consistent with the temperature of the measured gas (switch). Under normal use, the external temperature changes slowly, the temperature difference between the instrument and the switch body is small, and the instrument pointer does not change much. However, there are many special cases. For example, when the temperature changes more drastically, the instrument is small in size and changes faster with the temperature, which will cause the pointer to change. The most common is the influence of sunlight. When the temperature rises in the morning, if the sun shines on the instrument, the temperature of the instrument will rise significantly, and the downward correction of the pressure will occur. After noon, the switch temperature also rises, and the temperature difference with the instrument is narrowed, and the pointer will return to its proper position. If it is cloudy or rainy, the pointer will change very little. Usually the change in winter will be greater. If it is the morning after a cold wave, the pointer changes a lot, which is easy to cause false alarms. In addition, for the same temperature difference, the higher the rated value of the instrument, the greater the pointer change.

[0006] In order to reduce the impact of sunlight, a compensation device has been developed to prevent the instrument temperature from being too high due to sunlight, which may cause false alarms from the SF6 density relay, thereby improving the accuracy of monitoring SF6 gas pressure. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide a real-time compensation device for a density meter and a compensation method thereof, so as to avoid the false alarm of the SF6 density relay caused by excessive temperature of the instrument due to sunlight, thereby improving the accuracy of monitoring the SF6 gas pressure.

[0008] In order to solve the above technical problems, the technical solution of the present invention is: a real-time compensation device for a density meter, the innovation of which is: comprising a density relay, a temperature acquisition control module and a motor transmission module; The density relay is arranged on the SF6 high-voltage AC circuit breaker, and the density relay is used to monitor the purity and density of the SF6 high-voltage AC circuit breaker; the temperature acquisition control module is arranged on the density relay, and the temperature inside the density relay is monitored through the temperature acquisition control module, and the temperature acquisition control module is controlled and connected with the motor transmission module; the motor transmission module is arranged on the density relay, and the density relay is driven to rotate an angle through the motor transmission module; a pointer correction structure is arranged on the density relay, and the pointer correction structure is controlled by the temperature acquisition control module.

[0009] Furthermore, the density relay is filled with oil to reduce the pointer variation of the density relay; or a stainless steel protective cover is provided on the density relay to block direct sunlight or rain to reduce the pointer variation of the density relay.

[0010] A real-time compensation method for a density meter, the innovation of which is as follows: S1: Temperature detection and comparison: The temperature acquisition control module is used to detect the temperature value of SF6 gas in the SF6 high-voltage AC circuit breaker and the temperature value inside the density relay for comparison, and to determine whether the temperature difference between the SF6 gas and the temperature of the density relay requires pointer correction, or whether the density relay requires angle adjustment; S2: Correction and adjustment of the density relay: The following judgment is made based on the monitoring situation of the temperature acquisition module in S1: If the temperature value of the density relay is higher than the temperature value of the SF6 gas, and the temperature value in the density relay continues to rise, the difference between the two increases; at this time, the motor drive module is used to drive the density relay to rotate the angle to avoid direct sunlight, so as to reduce the temperature increase rate of the density relay; if the temperature value in the density relay is higher than the temperature value of the SF6 gas by no more than 8°C, the pointer correction is not used; if the temperature value in the density relay is higher than the temperature value of the SF6 gas by more than 8°C, the pointer correction structure is used to correct the pointer of the density relay downward by 0.3MPa; If the temperature value of the density relay is lower than the temperature value of the SF6 gas, and the temperature value in the density relay continues to decrease, the difference between the two increases; at this time, the motor transmission module is used to drive the density relay to rotate the angle for sunlight exposure to reduce the temperature reduction speed of the density relay; if there is no sunlight exposure, the motor transmission module is not used to drive the density relay for angle adjustment; if the temperature value in the density relay is less than the temperature value of the SF6 gas by no more than 8°C, the pointer correction is not used; if the temperature value in the density relay is less than the temperature value of the SF6 gas by more than 8°C, the pointer correction structure is used to correct the pointer of the density relay upward by 0.3MPa.

[0011] The advantages of the present invention are: 1) In the present invention, the temperature of the density relay affected by direct sunlight is collected, and the adjustment temperature is set in advance. When the temperature of the density relay affected by direct sunlight exceeds the set value, the angle of the density meter is adjusted in time, thereby compensating the density meter and ensuring the accuracy of the reading; avoiding false alarms of the density relay, thereby improving the reliability of product operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0013] Figure 1 It is a structural diagram of a real-time compensation device for a density meter of the present invention. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0015] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] like Figure 1 A real-time compensation device for a density meter shown includes a density relay 1, a temperature acquisition control module 2 and a motor transmission module 3.

[0017] The density relay 1 is arranged on the SF6 high-voltage AC circuit breaker, and the density relay 1 is used to monitor the purity and density of the SF6 high-voltage AC circuit breaker; the temperature acquisition control module 2 is arranged on the density relay 1, and the temperature inside the density relay 1 is monitored through the temperature acquisition control module 2, and the temperature acquisition control module 2 is controlled and connected with the motor transmission module 3; the motor transmission module 3 is arranged on the density relay 1, and the density relay 1 is driven to rotate by the motor transmission module 3; a pointer correction structure is arranged on the density relay 1, and the pointer correction structure is controlled by the temperature acquisition control module 2.

[0018] The density relay is filled with oil to reduce the pointer variation of the density relay; or a stainless steel protective cover is set on the density relay to block direct sunlight or rain to reduce the pointer variation of the density relay.

[0019] A real-time compensation method for a density meter, the specific compensation method is as follows: S1: Temperature detection and comparison: The temperature acquisition control module is used to detect the temperature value of SF6 gas in the SF6 high-voltage AC circuit breaker and the temperature value inside the density relay for comparison, and to determine whether the temperature difference between the SF6 gas and the temperature of the density relay requires pointer correction, or whether the density relay requires angle adjustment; S2: Correction and adjustment of the density relay: The following judgment is made based on the monitoring situation of the temperature acquisition module in S1: If the temperature value of the density relay is higher than the temperature value of the SF6 gas, and the temperature value in the density relay continues to rise, the difference between the two increases; at this time, the motor drive module is used to drive the density relay to rotate the angle to avoid direct sunlight, so as to reduce the temperature increase rate of the density relay; if the temperature value in the density relay is higher than the temperature value of the SF6 gas by no more than 8°C, the pointer correction is not used; if the temperature value in the density relay is higher than the temperature value of the SF6 gas by more than 8°C, the pointer correction structure is used to correct the pointer of the density relay downward by 0.3MPa; If the temperature value of the density relay is lower than the temperature value of the SF6 gas, and the temperature value in the density relay continues to decrease, the difference between the two increases; at this time, the motor transmission module is used to drive the density relay to rotate the angle for sunlight exposure to reduce the temperature reduction speed of the density relay; if there is no sunlight exposure, the motor transmission module is not used to drive the density relay for angle adjustment; if the temperature value in the density relay is less than the temperature value of the SF6 gas by no more than 8°C, the pointer correction is not used; if the temperature value in the density relay is less than the temperature value of the SF6 gas by more than 8°C, the pointer correction structure is used to correct the pointer of the density relay upward by 0.3MPa.

[0020] Those skilled in the art should understand that the present invention is not limited to the above-mentioned embodiments. The above-mentioned embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may be subject to various changes and improvements, and these changes and improvements shall all fall within the scope of the present invention claimed for protection.

Claims

1. A real-time compensation device for a density meter, characterized in that: Including density relay, temperature acquisition control module and motor transmission module; The density relay is arranged on the SF6 high-voltage AC circuit breaker, and the density relay is used to monitor the purity and density of the SF6 high-voltage AC circuit breaker; the temperature acquisition control module is arranged on the density relay, and the temperature inside the density relay is monitored through the temperature acquisition control module, and the temperature acquisition control module is controlled and connected with the motor transmission module; the motor transmission module is arranged on the density relay, and the density relay is driven to rotate an angle through the motor transmission module; a pointer correction structure is arranged on the density relay, and the pointer correction structure is controlled by the temperature acquisition control module.

2. A density meter real-time compensation device according to claim 1, characterized in that: The density relay is filled with oil to reduce the pointer variation of the density relay; or a stainless steel protective cover is provided on the density relay to block direct sunlight or rain to reduce the pointer variation of the density relay.

3. A real-time compensation method for a density meter, characterized in that: The specific compensation methods are as follows: S1: Temperature detection and comparison: The temperature acquisition control module is used to detect the temperature value of SF6 gas in the SF6 high-voltage AC circuit breaker and the temperature value inside the density relay for comparison, and to determine whether the temperature difference between the SF6 gas and the temperature of the density relay requires pointer correction, or whether the density relay requires angle adjustment; S2: Correction and adjustment of the density relay: The following judgment is made based on the monitoring situation of the temperature acquisition module in S1: If the temperature value of the density relay is higher than the temperature value of the SF6 gas, and the temperature value in the density relay continues to rise, the difference between the two increases; at this time, the motor drive module is used to drive the density relay to rotate the angle to avoid direct sunlight, so as to reduce the temperature increase rate of the density relay; if the temperature value in the density relay is higher than the temperature value of the SF6 gas by no more than 8°C, the pointer correction is not used; if the temperature value in the density relay is higher than the temperature value of the SF6 gas by more than 8°C, the pointer correction structure is used to correct the pointer of the density relay downward by 0.3MPa; If the temperature value of the density relay is lower than the temperature value of the SF6 gas, and the temperature value in the density relay continues to decrease, the difference between the two increases; at this time, the motor transmission module is used to drive the density relay to rotate the angle for sunlight exposure to reduce the temperature reduction speed of the density relay; if there is no sunlight exposure, the motor transmission module is not used to drive the density relay for angle adjustment; if the temperature value in the density relay is less than the temperature value of the SF6 gas by no more than 8°C, the pointer correction is not used; if the temperature value in the density relay is less than the temperature value of the SF6 gas by more than 8°C, the pointer correction structure is used to correct the pointer of the density relay upward by 0.3MPa.

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