CN104296892A - On-line monitoring method, device and system of internal temperature of SF6 high-voltage electrical equipment - Google Patents
On-line monitoring method, device and system of internal temperature of SF6 high-voltage electrical equipment Download PDFInfo
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- CN104296892A CN104296892A CN201410562603.0A CN201410562603A CN104296892A CN 104296892 A CN104296892 A CN 104296892A CN 201410562603 A CN201410562603 A CN 201410562603A CN 104296892 A CN104296892 A CN 104296892A
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Abstract
The invention discloses an on-line monitoring method of internal temperature of SF6 high-voltage electrical equipment. The on-line monitoring method of the internal temperature of the SF6 high-voltage electrical equipment comprises the steps that a first pressure value and a first temperature value of gas inside the SF6 high-voltage electrical equipment are measured, and a density value of the gas inside the SF6 high-voltage electrical equipment is obtained according to the first pressure value and the first temperature value; a second pressure value of the gas inside the SF6 high-voltage electrical equipment is measured, and the internal temperature of the SF6 high-voltage electrical equipment is obtained according to the second pressure value and the density value of the gas inside the SF6 high-voltage electrical equipment. The accurate density of the gas inside the SF6 high-voltage electrical equipment is obtained in time through continuous monitoring and systematic correction, data processing is carried out by utilizing the pressure-temperature characteristic relation of SF6 gas, and a corresponding internal temperature value of the SF6 high-voltage electrical equipment is obtained. The invention further provides an on-line monitoring device and system of the internal temperature of the SF6 high-voltage electrical equipment. The on-line monitoring device and system of the internal temperature of the SF6 high-voltage electrical equipment achieve real-time and accurate measurement of the internal temperature of the electrical equipment, lower detection cost and are suitable for engineering application.
Description
Technical field
The present invention relates to high voltage electric equipment device for detecting temperature, particularly relate to a kind of SF6 high voltage electric equipment internal temperature on-line monitoring method, Apparatus and system.
Background technology
At present, along with rapid economic development, China's electric system capacity sharply expands, and particularly the high voltage electric equipment consumption such as GIS gets more and more, and sulfur hexafluoride (GIS) high voltage electric equipment has been widely used in power department, industrial and mining enterprises.During the work of GIS electrical equipment, temperature is one of important parameter weighing electric equipment operation state, and the normal heating of each parts (particularly each parts of plenum interior) should not exceed its maximum permissible temperature, the reliable and secure operation of guarantee equipment.And the difficulty that existing detection method exists when the high-voltage electrical apparatus device temperatures such as GIS, SF6 primary cut-out detect.
As there is following subject matter when infrared radiation detection apparatus detects GIS high voltage electric equipment temperature: the measure of prevention high voltage electric equipment temperature overheating is one of State Grid Corporation of China's 18 great anti-accident measures of electrical network, and switching devices temperature monitoring has caused showing great attention to of electric system." charging equipment infrared diagnosis technology application directive/guide " has been widely used in high voltage electric equipment temperature detection, thus has ensured the safe operation of electrical network.But the air chamber due to GIS high voltage electric equipment is totally enclosed, infrared temperature detector can only detect the surface temperature of equipment; In some local time of checkout equipment, the infrared radiation of infrared radiation detection apparatus can be subject to the stop of parts, " projection " of temperature on surface just can only be detected, and inner true temperature cannot be detected; Infrared radiation detection apparatus belongs to off-line monitoring, change procedure and the Timeliness coverage unit exception of air chamber temperature can not be reflected in time, the dynamic change that equipment runs can not be reflected, cannot predict device interior temperature changing trend, repair based on condition of component and the grid automation truly of equipment can not be realized; And testing cost is high, electric company has been the detecting instrument that testing need be equipped with patrol officer, equipment vehicle and high value.Comprise power failure operating loss during detection, rough calculation, the testing cost of sharing every year of each high voltage switchyard is about about several ten thousand to hundreds of thousands unit.
Infrared radiation is contactless and adopt thermosensitive device contact temperature on-line monitoring also to there is following defect: the accuracy of contactless temperature-measuring and reliability affect measuring tempeature by factors such as lens optical distortion, shooting angle, shooting distance, surface configuration, temperature and forbidden; Air chamber due to GIS high voltage electric equipment is totally enclosed, be difficult to measure, and the electric pressure of GIS high voltage electric equipment is high, higher to insulating requirements, contact product mainly contains wireless electromagnetic emission type, optical-fiber type and unlimited air infrared type three kinds of products at present, and these products can only be 12KV switch cubicle, ring main unit for open type, for totally enclosed GIS high voltage electric equipment, also helpless.
Along with unattended operation transformer station is constantly strengthened to networking, digitizing future development and the requirement to remote control, remote measurement, the temperature of online remote monitoring SF 6 high-voltage inside electric appliance has very important practical significance, becomes important research direction in the application of SF 6 high-voltage electrical equipment.But carrying out temperature online measurement to SF6 high voltage electric equipment plenum interior is a difficult problem always.Because high voltage electric equipment air chamber is a hermetic system, each point temperature in its stationary gas is different, and the heat transfer property of SF6 gas is very poor, so simply can not directly measure its internal temperature in gas outlet.
Therefore, those skilled in the art is devoted to develop a kind of New type of S F6 high voltage electric equipment internal temperature on-line monitoring method and the device that can solve on-line measurement and be forbidden and be difficult to reflect main gas tank's temperature problem.
Summary of the invention
Because the above-mentioned defect of prior art, technical matters to be solved by this invention is to provide a kind of SF6 high voltage electric equipment internal temperature on-line monitoring method, Apparatus and system, realize measuring in real time, accurately inside electric appliance temperature, reduce testing cost, make it to be more suitable for engineer applied.
For achieving the above object, the invention provides a kind of SF6 high voltage electric equipment internal temperature on-line monitoring method, comprising:
Measure the first force value and first temperature value of the gas of described SF6 high voltage electric equipment inside, and according to the first force value of the gas of described SF6 high voltage electric equipment inside and the first temperature value, obtain the density value of the gas of described SF6 high voltage electric equipment inside;
Measure the second force value of the gas of described SF6 high voltage electric equipment inside, and according to the density value of the second force value of the gas of described SF6 high voltage electric equipment inside and the gas of described SF6 high voltage electric equipment inside, obtain the internal temperature of described SF6 high voltage electric equipment.
First force value and the first temperature value are measure under same timing node to obtain.
Second force value is the force value of the gas of described SF6 high voltage electric equipment inside that correspond to the internal temperature of current described SF6 high voltage electric equipment, that measure.
First force value of the described gas according to described SF6 high voltage electric equipment inside and the first temperature value, the step obtaining the density value of the gas of described SF6 high voltage electric equipment inside also comprises: revise the density value of the gas of the described SF6 high voltage electric equipment inside obtained.
Further, the first force value of the described gas according to described SF6 high voltage electric equipment inside and the first temperature value, the step obtaining the density value of the gas of described SF6 high voltage electric equipment inside specifically comprises:
Calculate the density value of described SF6 high voltage electric equipment internal gas according to the first gas density curvilinear equation (1), described first gas density curvilinear equation (1) is as follows:
p
1＝0.57×10
-4ρ
1T
1(1+B
1)-ρ
1 2A
1
A
1＝0.75×10
-3(1-0.73×10
-3ρ
1)
B
1＝2.51×10
-3ρ
1(1-0.85×10
-3ρ
1)
In formula, ρ
1for the density value of the gas of described SF6 high voltage electric equipment inside, T
1for the first temperature value of the gas of described SF6 high voltage electric equipment inside, p
1for the first force value of the gas of described SF6 high voltage electric equipment inside.
Further, the density value of the gas of described the second force value according to described SF6 high voltage electric equipment internal gas and described SF6 high voltage electric equipment inside, the step obtaining the internal temperature of described SF6 high voltage electric equipment specifically comprises:
According to the anti-internal temperature pushing away described SF6 high voltage electric equipment of the second gas density curvilinear equation (2), described second gas density curvilinear equation is as follows:
p
2＝0.57×10
-4ρ
2T
2(1+B
2)-ρ
2 2A
2
A
2＝0.75×10
-3(1-0.73×10
-3ρ
2)
B
2＝2.51×10
-3ρ
2(1-0.85×10
-3ρ
2)
In formula, ρ
2for the density value of described SF6 high voltage electric equipment internal gas, T
2for the internal temperature of described SF6 high voltage electric equipment, p
2for the second force value of described SF6 high voltage electric equipment internal gas, ρ
2and ρ
1equal.
Further, first force value of the described gas according to described SF6 high voltage electric equipment inside and the first temperature value, the step obtaining the density value of the gas of described SF6 high voltage electric equipment inside specifically comprises: according to the relation data between experimental formula between the Ideal-Gas Equation, SF6 state parameter curve, SF6 pressure-temperature or SF6 pressure and temperature, obtain the density value of described SF6 high voltage electric equipment internal gas.
Described SF6 state parameter curve can be obtained by the relation data between experimental formula between described first gas density curvilinear equation (1), SF6 pressure-temperature or SF6 pressure and temperature.
Further, the density value of the gas of described the second force value according to described SF6 high voltage electric equipment internal gas and described SF6 high voltage electric equipment inside, the step obtaining the internal temperature of described SF6 high voltage electric equipment specifically comprises: according to the relation data between experimental formula between the Ideal-Gas Equation, SF6 state parameter curve, SF6 pressure-temperature or SF6 pressure and temperature, obtain the internal temperature of described SF6 high voltage electric equipment.The Ideal-Gas Equation is: P1/T1=P2/T2.
Present invention also offers a kind of SF6 high voltage electric equipment internal temperature on-Line Monitor Device, comprising:
Housing, forms the space be communicated with the inside of SF6 high voltage electric equipment to be measured in described housing; Pressure monitor and temperature monitoring; Described pressure monitor is for measuring the first force value and second force value of the gas of described SF6 high voltage electric equipment inside; Described temperature monitoring is for measuring the first temperature value of the gas of described SF6 high voltage electric equipment;
Also comprise data processing module, described data processing module comprises:
Described first computing unit, for according to the first force value of the gas in described SF6 high voltage electric equipment inside and the first temperature value, obtains the density value of the gas in described SF6 high voltage electric equipment inside;
Described second computing unit, for the density value according to the gas in the second force value of described SF6 high voltage electric equipment internal gas and described SF6 high voltage electric equipment inside, obtains the internal temperature of described SF6 high voltage electric equipment.
Further, described first computing unit calculates the density value of gas in described SF6 high voltage electric equipment inside specifically for the first force value according to the gas in described SF6 high voltage electric equipment inside, the first temperature value and the first gas density curvilinear equation (1), and described first gas density curvilinear equation (1) is as follows:
p
1＝0.57×10
-4ρ
1T
1(1+B
1)-ρ
1 2A
1
A
1＝0.75×10
-3(1-0.73×10
-3ρ
1)
B
1＝2.51×10
-3ρ
1(1-0.85×10
-3ρ
1)
In formula, ρ
1for the density value of the gas in described SF6 high voltage electric equipment inside, T
1for the first temperature value of the gas in described SF6 high voltage electric equipment inside, p
1for the first force value of the gas in described SF6 high voltage electric equipment inside.
Further, described second computing unit is specifically for the density value of the gas in the second force value according to described SF6 high voltage electric equipment internal gas, described SF6 high voltage electric equipment inside and the second gas density curvilinear equation (2), obtain the internal temperature of described SF6 high voltage electric equipment, described second gas density curvilinear equation (2) is as follows:
p
2＝0.57×10
-4ρ
2T
2(1+B
2)-ρ
2 2A
2
A
2＝0.75×10
-3(1-0.73×10
-3ρ
2)
B
2＝2.51×10
-3ρ
2(1-0.85×10
-3ρ
2)
In formula, ρ
2for the density value of described SF6 high voltage electric equipment internal gas, T
2for the internal temperature of described SF6 high voltage electric equipment, p
2for the second force value of described SF6 high voltage electric equipment internal gas, ρ
2and ρ
1equal.
Further, described pressure monitor is pressure transducer or pressure unit.
Further, described pressure transducer or transmitter are absolute pressure type pressure sensor or transmitter, or relative pressure type pressure transducer or transmitter.Absolute pressure type pressure sensor: be exactly the pressure transducer that its measuring principle is absolute pressure.
Further, described temperature monitoring is temperature sensor or temperature transmitter.
Further, described SF6 high voltage electric equipment internal temperature on-Line Monitor Device also comprises temperature-sensitive placing piece, and described temperature monitoring is arranged in described temperature-sensitive placing piece.
Further, described SF6 high voltage electric equipment internal temperature on-Line Monitor Device also comprises communication module, and described communication module is used for and external device communication.
Present invention also offers a kind of SF6 high voltage electric equipment internal temperature on-line monitoring system, comprise one or more aforesaid SF6 high voltage electric equipment internal temperature on-Line Monitor Device.
Further, described SF6 high voltage electric equipment internal temperature on-line monitoring system also comprises micro-water sensor or transmitter, and described micro-water sensor or transmitter can be monitored the SF6 gas moisture of SF6 high voltage electric equipment.
Technique effect
SF6 high voltage electric equipment internal temperature on-line monitoring method disclosed by the invention, by the measurement to monitoring device pressure and temperature, obtain the SF6 gas density of SF6 high voltage electric equipment, then according to SF6 state equation or state parameter curve or data, corresponding SF6 high voltage electric equipment internal temperature values is obtained.
Because SF6 high voltage electric equipment has good sealing property, its variable density is a process slowly, and under extreme case, the accidents such as severe leakage occurring can Timeliness coverage by density monitor.By continuous print monitoring and system correction, the accurate density of SF6 gas of SF6 high voltage electric equipment can be obtained in time, the pressure-temperature characteristic relation of SF6 gas is utilized to carry out data processing, obtain corresponding SF6 high voltage electric equipment internal temperature values, complete the accurate measurements to SF6 high voltage electric equipment internal temperature.Specifically can according to SF6 state equation or state parameter curve or data, obtain corresponding SF6 high voltage electric equipment internal temperature values, force value, density value, ambient temperature value and output alarm signal etc., the internal temperature of the totally enclosed air chambers of high voltage electric equipment such as on-line measurement GIS can be solved like this.
Be described further below with reference to the technique effect of accompanying drawing to design of the present invention, concrete structure and generation, to understand object of the present invention, characteristic sum effect fully.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of the SF6 high voltage electric equipment internal temperature on-line monitoring method of a preferred embodiment of the present invention;
Fig. 2 is the principle schematic of the SF6 high voltage electric equipment internal temperature on-line monitoring method of a preferred embodiment of the present invention;
Fig. 3 is the schematic diagram of the SF6 high voltage electric equipment internal temperature on-Line Monitor Device of a preferred embodiment of the present invention;
Fig. 4 is the schematic diagram of the data processing module of the SF6 high voltage electric equipment internal temperature on-Line Monitor Device of a preferred embodiment of the present invention;
Fig. 5 is the schematic diagram of the SF6 high voltage electric equipment internal temperature on-Line Monitor Device of a preferred embodiment of the present invention.
Embodiment
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment 1
Fig. 1 is the process flow diagram of the SF6 high voltage electric equipment internal temperature on-line monitoring method of a preferred embodiment of the present invention; Present embodiments provide a kind of SF6 high voltage electric equipment internal temperature on-line monitoring method, comprising:
S1: the first force value and the first temperature value of measuring the gas of described SF6 high voltage electric equipment inside, and according to the first force value of the gas of described SF6 high voltage electric equipment inside and the first temperature value (outside temperature), obtain the density value of the gas of described SF6 high voltage electric equipment inside; Its method and principle are: because SF6 high voltage electric equipment has good sealing property, and its variable density is a process extremely slowly, and within a phase in stage, be not gas leakage, its internal density is constant.So, we monitor its force value (internal gas) and temperature value (outside) by continuous print, and utilize software to carry out system correction, can obtain the accurate density of SF6 gas of the inside of SF6 high voltage electric equipment.
S2: the second force value then measuring the gas of described SF6 high voltage electric equipment inside, and according to the density value of the second force value of the gas of described SF6 high voltage electric equipment inside and the gas of described SF6 high voltage electric equipment inside, obtain the internal temperature of described SF6 high voltage electric equipment.
The method of embodiment 1 is applied to a kind of SF6 high voltage electric equipment internal temperature on-Line Monitor Device, and described device comprises: housing, forms the space be communicated with the inside of SF6 high voltage electric equipment to be measured in described housing; Pressure monitor and temperature monitoring is provided with in described housing; Described pressure monitor, for measuring the force value of the gas in described SF6 high voltage electric equipment inside, comprises the first force value and the second force value; Described temperature monitoring is for measuring the first temperature value of described SF6 high voltage electric equipment gas; Also comprise data processing module, described data processing module is used for the first force value, the second force value and the first temperature value according to the gas in described SF6 high voltage electric equipment inside, obtains the internal temperature of described SF6 high voltage electric equipment.
SF6 high voltage electric equipment has good sealing property, and the variable density of internal gas is a slowly process, and under extreme case, the accidents such as severe leakage occurring can Timeliness coverage by density monitor.The unchangeability of the density of this implementation basis SF6 high voltage electric equipment internal gas, by the Measurement accuracy to force value, the anti-Current Temperatures pushing away SF6 high voltage electric equipment inside.First force value and the first temperature value are measure under same timing node to obtain; According to the first force value, first temperature value of the gas in the SF6 high voltage electric equipment inside that continuous coverage is arrived, according within a phase in stage, SF6 high voltage electric equipment is less than gas leakage, and its internal density is constant.So, we monitor its force value (internal gas) and temperature value (outside) by continuous print, and utilize software to carry out system correction, can obtain the accurate density value of the gas in SF6 high voltage electric equipment inside; According to the characteristic relation between the density value of gas in SF6 high voltage electric equipment inside, the second force value of SF6 high voltage electric equipment internal gas and " pressure, temperature and density " three, obtain corresponding SF6 high voltage electric equipment internal temperature values; Wherein, the second force value is the force value of the gas of described SF6 high voltage electric equipment inside that correspond to the internal temperature of current described SF6 high voltage electric equipment, that measure.
In a preferred embodiment of the invention, in order to guarantee the accuracy of the density value of the gas in the SF6 high voltage electric equipment inside that obtains further, the density value of averaging method (mean value method) to the gas in SF6 high voltage electric equipment inside can be adopted to revise.Concrete more detailed method does not just describe at this.
Fig. 2 shows the principle schematic of the SF6 high voltage electric equipment internal temperature on-line monitoring method of the present embodiment.
Described the first force value according to the gas in described SF6 high voltage electric equipment inside and the first temperature value, the step obtaining the density value of the gas in described SF6 high voltage electric equipment inside specifically comprises:
Calculate the density value of gas in described SF6 high voltage electric equipment inside according to the first gas density curvilinear equation (1), described first gas density curvilinear equation (1) is as follows:
p
1＝0.57×10
-4ρ
1T
1(1+B
1)-ρ
1 2A
1
A
1＝0.75×10
-3(1-0.73×10
-3ρ
1)
B
1＝2.51×10
-3ρ
1(1-0.85×10
-3ρ
1)
In formula, ρ
1for the density value of the gas in described SF6 high voltage electric equipment inside, T
1for the first temperature value of described SF6 high voltage electric equipment gas, p
1for the first force value of the gas in described SF6 high voltage electric equipment inside.According to the first force value, first temperature value of the gas in the SF6 high voltage electric equipment inside that continuous coverage is arrived, according within a phase in stage, SF6 high voltage electric equipment is less than gas leakage, and its internal density is constant.So, we monitor its force value (internal gas) and temperature value (outside) by continuous print, and utilize software to carry out system correction, can obtain the accurate density value of the gas in SF6 high voltage electric equipment inside.
The density value of the gas in described the second force value according to described SF6 high voltage electric equipment internal gas and described SF6 high voltage electric equipment inside, the step obtaining the internal temperature of described SF6 high voltage electric equipment specifically comprises:
According to the anti-internal temperature pushing away described SF6 high voltage electric equipment of the second gas density curvilinear equation (2), described second gas density curvilinear equation is as follows:
p
2＝0.57×10
-4ρ
2T
2(1+B
2)-ρ
2 2A
2
A
2＝0.75×10
-3(1-0.73×10
-3ρ
2)
B
2＝2.51×10
-3ρ
2(1-0.85×10
-3ρ
2)
In formula, ρ
2for the density value of described SF6 high voltage electric equipment internal gas, T
2for the internal temperature of described SF6 high voltage electric equipment, p
2for the second force value of described SF6 high voltage electric equipment internal gas, ρ
2and ρ
1equal.
In other embodiments of the invention, described the first force value according to the gas in described SF6 high voltage electric equipment inside and the first temperature value, the step obtaining the density value of the gas in described SF6 high voltage electric equipment inside can also specifically comprise: according to the relation data between experimental formula between SF6 state parameter curve, SF6 pressure-temperature or SF6 pressure and temperature, obtains the density value of gas in described SF6 high voltage electric equipment inside.
Similarly, the density value of the gas in described the second force value according to described SF6 high voltage electric equipment internal gas and described SF6 high voltage electric equipment inside, the step obtaining the internal temperature of described SF6 high voltage electric equipment can also specifically comprise: according to SF
6relation data between state parameter curve or SF6 pressure and temperature, obtains the internal temperature of described SF6 high voltage electric equipment.
Monitored by continuous print, the accurate density of SF6 gas of SF6 high voltage electric equipment can be obtained in time, the pressure-temperature characteristic relation of SF6 gas is utilized to carry out data processing, obtain corresponding SF6 high voltage electric equipment internal temperature values, complete the accurate measurements to SF6 high voltage electric equipment internal temperature.The method that this enforcement provides, achieves and measures in real time, accurately inside electric appliance temperature, reduces testing cost, is more suitable for engineer applied.
Embodiment 2
Fig. 3 shows the schematic diagram of the SF6 high voltage electric equipment internal temperature on-Line Monitor Device of the present embodiment.Present embodiments provide a kind of SF6 high voltage electric equipment internal temperature on-Line Monitor Device, comprising:
Housing 7, forms the space be communicated with the inside of SF6 high voltage electric equipment to be measured in described housing 7; Pressure monitor 1 and temperature monitoring 2 is provided with in described housing; Described pressure monitor 1 is for measuring the first force value and second force value of the gas in described SF6 high voltage electric equipment inside; Described temperature monitoring 2 is for measuring the first temperature value of the gas of described SF6 high voltage electric equipment;
Also comprise data processing module 3, described data processing module comprises:
Described first computing unit, for according to the first force value of the gas in described SF6 high voltage electric equipment inside and the first temperature value, obtains the density value of the gas in described SF6 high voltage electric equipment inside; Its method and principle are: because SF6 high voltage electric equipment has good sealing property, and its variable density is a process extremely slowly, and within a phase in stage, be not gas leakage, its internal density is constant.So, we monitor its force value (internal gas) and temperature value (outside) by continuous print, and utilize software to carry out system correction, can obtain the accurate density of SF6 gas of the inside of SF6 high voltage electric equipment.
Described second computing unit, for the density value according to the gas in the second force value of described SF6 high voltage electric equipment internal gas and described SF6 high voltage electric equipment inside, obtains the internal temperature of described SF6 high voltage electric equipment.
In the present embodiment, SF6 high voltage electric equipment internal temperature on-Line Monitor Device is connected on SF6 high voltage electric equipment body connector 6 by jointing 5.
Fig. 4 shows the data processing module of the SF6 high voltage electric equipment internal temperature on-Line Monitor Device of the present embodiment.The force value of the gas in described SF6 high voltage electric equipment inside measured by described pressure monitor, and the first force value of the gas in described SF6 high voltage electric equipment inside is transferred to described first computing unit.First temperature value of the gas of described SF6 high voltage electric equipment for measuring the first temperature value of the gas of described SF6 high voltage electric equipment, and is transferred to described first computing unit by described temperature monitoring.Described first computing unit, according to the relation between " pressure, temperature and density " three, obtain the density value of the gas in described SF6 high voltage electric equipment inside, its method and principle are: because SF6 high voltage electric equipment has good sealing property, its variable density is a process extremely slowly, within a phase in stage, be not gas leakage, its internal density is constant.So, we monitor its force value (internal gas) and temperature value (outside) by continuous print, and utilize software to carry out system correction, can obtain the accurate density of SF6 gas of the inside of SF6 high voltage electric equipment.And the accurate density value of the gas in described SF6 high voltage electric equipment inside is transferred to described second computing unit.
The variable density of SF6 high voltage electric equipment internal gas is a slowly process, and under extreme case, the accidents such as severe leakage occurring can Timeliness coverage by density monitor.The unchangeability of the density of this implementation basis SF6 high voltage electric equipment internal gas, by the Measurement accuracy to force value, the anti-Current Temperatures pushing away SF6 high voltage electric equipment inside.
The second force value of described SF6 high voltage electric equipment internal gas measured by described pressure monitor, and the force value of described SF6 high voltage electric equipment internal gas is transferred to described second computing unit; Described second computing unit, according to the relation between the density value of the gas in the second force value of described SF6 high voltage electric equipment internal gas, described SF6 high voltage electric equipment inside and " pressure, temperature and density " three, obtains the internal temperature of described SF6 high voltage electric equipment.
The SF6 high voltage electric equipment internal temperature on-Line Monitor Device of the present embodiment also comprises communication module 4, and described communication module is used for and external device communication.
In the present embodiment, described first computing unit calculates the density value of gas in described SF6 high voltage electric equipment inside specifically for the force value according to the gas in described SF6 high voltage electric equipment inside, temperature value and the first gas density curvilinear equation (1), and described first gas density curvilinear equation (1) is as follows:
p
1＝0.57×10
-4ρ
1T
1(1+B
1)-ρ
1 2A
1
A
1＝0.75×10
-3(1-0.73×10
-3ρ
1)
B
1＝2.51×10
-3ρ
1(1-0.85×10
-3ρ
1)
In formula, ρ
1for the density value of the gas in described SF6 high voltage electric equipment inside, T
1for the first temperature value of the gas of described SF6 high voltage electric equipment, p
1for the first force value of the gas in described SF6 high voltage electric equipment inside.
In other embodiments of the invention, the described force value according to the gas in described SF6 high voltage electric equipment inside and temperature value, the density value obtaining the gas in described SF6 high voltage electric equipment inside can also according to the relation data between experimental formula between SF6 state parameter curve, SF6 pressure-temperature or SF6 pressure and temperature.
Described second computing unit is specifically for the density value of the gas in the force value according to described SF6 high voltage electric equipment internal gas, described SF6 high voltage electric equipment inside and the second gas density curvilinear equation (2), obtain the internal temperature of described SF6 high voltage electric equipment, described second gas density curvilinear equation (2) is as follows:
p
2＝0.57×10
-4ρ
2T
2(1+B
2)-ρ
2 2A
2
A
2＝0.75×10
-3(1-0.73×10
-3ρ
2)
B
2＝2.51×10
-3ρ
2(1-0.85×10
-3ρ
2)
In formula, ρ
2for the density value of described SF6 high voltage electric equipment internal gas, T
2for the internal temperature of described SF6 high voltage electric equipment, p
2for the second force value of described SF6 high voltage electric equipment internal gas, ρ
2and ρ
1equal.
Similarly, the density value of the gas in the described force value according to described SF6 high voltage electric equipment internal gas and described SF6 high voltage electric equipment inside, the internal temperature obtaining described SF6 high voltage electric equipment can also according to SF
6relation data between state parameter curve or SF6 pressure and temperature.
Fig. 5 shows a kind of SF6 high voltage electric equipment internal temperature on-Line Monitor Device of the temperature-sensitive placing piece had, and described temperature monitoring 2 is arranged in described temperature-sensitive placing piece 8, guarantees that the temperature measured is more suitable.So-called temperature-sensitive placing piece is exactly that temperature-sensitive placing piece is made up of heat-barrier material, and in same environment, the change of its internal temperature is consistent with the change of SF6 high voltage electric equipment internal temperature.That is temperature sensor can not be placed in the gas of SF6 high voltage electric equipment.
By the measurement to pressure and temperature, obtain the SF6 gas density of SF6 high voltage electric equipment, then according to SF6 state equation or state parameter curve or data, obtain corresponding SF6 high voltage electric equipment internal temperature values.Because SF6 high voltage electric equipment has good sealing property, its variable density is a process slowly, and under extreme case, the accidents such as severe leakage occurring can Timeliness coverage by density monitor.Within a phase in stage, be not gas leakage, its internal density is constant.We monitor its force value (internal gas) and temperature value (outside) by continuous print, and utilize software to carry out system correction, can obtain the accurate density of SF6 gas of the inside of SF6 high voltage electric equipment.So monitored by continuous print, the accurate density of SF6 gas of SF6 high voltage electric equipment can be obtained in time, the pressure-temperature characteristic relation of SF6 gas is utilized to carry out data processing, obtain corresponding SF6 high voltage electric equipment internal temperature values, complete the accurate measurements to SF6 high voltage electric equipment internal temperature.Specifically according to SF6 state equation or state parameter curve or data, corresponding SF6 high voltage electric equipment internal temperature values, force value, density value, ambient temperature value can be obtained, and output temperature exceeds standard alerting signal.
A lot of fault or accident have a process, if we monitor the internal temperature of the totally enclosed air chamber of the high voltage electric equipments such as GIS, pinpoint the problems in advance, process in time, can not have an accident, and are significant to guarantee power grid security.Can solve the internal temperature of the totally enclosed air chambers of high voltage electric equipment such as on-line measurement GIS like this, can carry out large-scale promotion, the contribution of great novelty is made in the intellectuality for electrical network.
More than describe preferred embodiment of the present invention in detail.Should be appreciated that the ordinary skill of this area just design according to the present invention can make many modifications and variations without the need to creative work.Therefore, all technician in the art, all should by the determined protection domain of claims under this invention's idea on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (10)
1. a SF6 high voltage electric equipment internal temperature on-line monitoring method, is characterized in that, comprising:
Measure the first force value and first temperature value of the gas of described SF6 high voltage electric equipment inside, and according to the first force value of the gas of described SF6 high voltage electric equipment inside and the first temperature value, obtain the density value of the gas of described SF6 high voltage electric equipment inside;
Measure the second force value of the gas of described SF6 high voltage electric equipment inside, and according to the density value of the second force value of the gas of described SF6 high voltage electric equipment inside and the gas of described SF6 high voltage electric equipment inside, obtain the internal temperature of described SF6 high voltage electric equipment.
2. SF6 high voltage electric equipment internal temperature on-line monitoring method as claimed in claim 1, it is characterized in that, first force value of the described gas according to described SF6 high voltage electric equipment inside and the first temperature value, the step obtaining the density value of the gas of described SF6 high voltage electric equipment inside specifically comprises:
Calculate the density value of described SF6 high voltage electric equipment internal gas according to the first gas density curvilinear equation (1), described first gas density curvilinear equation (1) is as follows:
p
1＝0.57×10
-4ρ
1T
1(1+B
1)-ρ
1 2A
1
A
1＝0.75×10
-3(1-0.73×10
-3ρ
1)
B
1＝2.51×10
-3ρ
1(1-0.85×10
-3ρ
1)
In formula, ρ
1for the density value of the gas of described SF6 high voltage electric equipment inside, T
1for the first temperature value of the gas of described SF6 high voltage electric equipment inside, p
1for the first force value of the gas of described SF6 high voltage electric equipment inside.
3. SF6 high voltage electric equipment internal temperature on-line monitoring method as claimed in claim 1, it is characterized in that, the density value of the gas of described the second force value according to described SF6 high voltage electric equipment internal gas and described SF6 high voltage electric equipment inside, the step obtaining the internal temperature of described SF6 high voltage electric equipment specifically comprises:
According to the anti-internal temperature pushing away described SF6 high voltage electric equipment of the second gas density curvilinear equation (2), described second gas density curvilinear equation is as follows:
p
2＝0.57×10
-4ρ
2T
2(1+B
2)-ρ
2 2A
2
A
2＝0.75×10
-3(1-0.73×10
-3ρ
2)
B
2＝2.51×10
-3ρ
2(1-0.85×10
-3ρ
2)
In formula, ρ
2for the density value of described SF6 high voltage electric equipment internal gas, T
2for the internal temperature of described SF6 high voltage electric equipment, p
2for the second force value of described SF6 high voltage electric equipment internal gas, ρ
2and ρ
1equal.
4. SF6 high voltage electric equipment internal temperature on-line monitoring method as claimed in claim 1, it is characterized in that, first force value of the described gas according to described SF6 high voltage electric equipment inside and the first temperature value, the step obtaining the density value of the gas of described SF6 high voltage electric equipment inside specifically comprises: according to the relation data between experimental formula between the Ideal-Gas Equation, SF6 state parameter curve, SF6 pressure-temperature or SF6 pressure and temperature, obtain the density value of described SF6 high voltage electric equipment internal gas.
5. SF6 high voltage electric equipment internal temperature on-line monitoring method as claimed in claim 1, it is characterized in that, the density value of the gas of described the second force value according to described SF6 high voltage electric equipment internal gas and described SF6 high voltage electric equipment inside, the step obtaining the internal temperature of described SF6 high voltage electric equipment specifically comprises:
According to the relation data between experimental formula between the Ideal-Gas Equation, SF6 state parameter curve, SF6 pressure-temperature or SF6 pressure and temperature, obtain the internal temperature of described SF6 high voltage electric equipment.
6. SF6 high voltage electric equipment internal temperature on-line monitoring method as claimed in claim 1, it is characterized in that, first force value of the described gas according to described SF6 high voltage electric equipment inside and the first temperature value, the step obtaining the density value of the gas of described SF6 high voltage electric equipment inside also comprises: revise the density value of the gas of the described SF6 high voltage electric equipment inside obtained.
7. a SF6 high voltage electric equipment internal temperature on-Line Monitor Device, is characterized in that, comprising:
Housing, forms the space be communicated with the inside of SF6 high voltage electric equipment to be measured in described housing; Pressure monitor and temperature monitoring, described pressure monitor is for measuring the first force value and second force value of the gas of described SF6 high voltage electric equipment inside; Described temperature monitoring is for measuring the first temperature value of the gas of described SF6 high voltage electric equipment;
Also comprise data processing module, described data processing module comprises:
Described first computing unit, for according to the first force value of the gas in described SF6 high voltage electric equipment inside and the first temperature value, obtains the density value of the gas in described SF6 high voltage electric equipment inside;
Described second computing unit, for the density value according to the gas in the second force value of described SF6 high voltage electric equipment internal gas and described SF6 high voltage electric equipment inside, obtains the internal temperature of described SF6 high voltage electric equipment.
8. SF6 high voltage electric equipment internal temperature on-Line Monitor Device as claimed in claim 7, it is characterized in that, described SF6 high voltage electric equipment internal temperature on-Line Monitor Device also comprises temperature-sensitive placing piece, and described temperature monitoring is arranged in described temperature-sensitive placing piece.
9. SF6 high voltage electric equipment internal temperature on-Line Monitor Device as claimed in claim 7, it is characterized in that, described SF6 high voltage electric equipment internal temperature on-Line Monitor Device also comprises communication module, and described communication module is used for and external device communication.
10. a SF6 high voltage electric equipment internal temperature on-line monitoring system, is characterized in that, comprises the SF6 high voltage electric equipment internal temperature on-Line Monitor Device described in one or more any one of claim 7 ~ 9.
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| CN201410562603.0A CN104296892A (en) | 2014-10-21 | 2014-10-21 | On-line monitoring method, device and system of internal temperature of SF6 high-voltage electrical equipment |
| CN201510683973.4A CN105203161B (en) | 2014-10-21 | 2015-10-20 | A kind of SF6High voltage electric equipment internal temperature on-line monitoring method, apparatus and system |
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| CN201510683973.4A Active CN105203161B (en) | 2014-10-21 | 2015-10-20 | A kind of SF6High voltage electric equipment internal temperature on-line monitoring method, apparatus and system |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN105203161A (en) | 2015-12-30 |
| CN105203161B (en) | 2018-05-15 |
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