CN110542854A - Online calibration method of gas density relay - Google Patents

Online calibration method of gas density relay Download PDF

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Publication number
CN110542854A
CN110542854A CN201910830707.8A CN201910830707A CN110542854A CN 110542854 A CN110542854 A CN 110542854A CN 201910830707 A CN201910830707 A CN 201910830707A CN 110542854 A CN110542854 A CN 110542854A
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China
Prior art keywords
gas density
density relay
value
temperature
contact
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CN201910830707.8A
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CN110542854B (en
Inventor
苏丽芳
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SHANGHAI ZHUODIAN ELECTRIC CO Ltd
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SHANGHAI ZHUODIAN ELECTRIC CO Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
    • G01R31/3277—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches
    • G01R31/3278—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches of relays, solenoids or reed switches

Abstract

the invention relates to a gas density relay. An online calibration method of a gas density relay comprises at least one heating device, at least one controller, at least one gas density detection sensor, at least one intelligent control unit and a contact signal sampling unit; control the unit through the intelligence to the controller, and then control the heating device, make the temperature of gas density relay rise, and then make the temperature boost of the temperature compensation component of density relay, make gas density relay take place the contact action, the contact action passes through contact signal sampling unit and transmits the intelligence and controls the unit, the intelligence is controlled the pressure value when the unit is moved according to the contact, the temperature value obtains gas density value, or directly is obtained gas density value, detect out gas density relay's contact signal action value, accomplish gas density relay's contact signal action value's check-up work. The invention can accurately verify the gas density relays of various measurement principles on site and can also verify the gas density relays without disassembly.

Description

online calibration method of gas density relay
Technical Field
The invention relates to a method for checking a gas density relay, in particular to an online checking method for the gas density relay.
Background
SF6 electrical products are widely applied to electric power departments and industrial and mining enterprises, and promote the rapid development of the electric power industry. How to ensure reliable and safe operation of SF6 electrical products has become one of the important tasks in the power sector. The SF6 gas density relay is one of the key elements of the SF6 electrical switch, is used for detecting the change of the SF6 gas density in the SF6 electrical equipment body, and the performance of the SF6 gas density relay directly influences the reliable and safe operation of the SF6 electrical equipment. The SF6 gas density relay installed on the site does not operate frequently, and after a period of time, the phenomenon of inflexible operation or poor contact of contacts often occurs, and some of them also have poor temperature compensation performance, and when the environmental temperature changes, the SF6 gas density relay is easy to malfunction. The SF6 gas density relay should be periodically verified. From the actual operation condition, the regular verification of the SF6 gas density relay on site is one of the necessary means for preventing the trouble and ensuring the safe and reliable operation of the power equipment. The operation principle of the density relay calibration device (or called density relay calibration instrument) used in the current market is that the gas pressure of the density relay is regulated to enable the density relay to generate contact action, a gas density value is obtained according to a pressure value and a temperature value when the contact is acted, a contact signal action value of the gas density relay is detected, and the calibration work of the contact signal action value of the gas density relay is completed. However, many density relays are installed in the field, and since there is no valve between the density relay and its electrical equipment, the density relay cannot be operated by adjusting the gas pressure to make the contacts operate. One of the existing solutions is to install a density relay check valve, but many devices cannot be installed; in many occasions, the additional installation of a density relay check valve can cause the reduction of the anti-seismic performance of the density relay; a large amount of capital is additionally required. The second solution is to disassemble the density relay for verification, which causes serious air leakage due to improper operation.
in summary, there is no calibration apparatus and calibration method for calibrating a gas density relay without a valve between the density relay and its electrical equipment and without disassembly. Meanwhile, if maintenance personnel need to check on site, a large amount of manpower and material resources are needed, and the problems of safety and cost are involved.
therefore, it is very desirable to invent a verification method, which is a verification device and a self-verifying gas density relay manufactured by the method technology: the valve is not arranged between the density relay and the electrical equipment, the valve does not need to be detached, the gas density relay can be checked on line, the cost is saved, the safety is improved, and the safety is guaranteed.
disclosure of Invention
the invention aims to overcome the defects in the prior art and provide an online checking method for a gas density relay, which can check the gas density relay on line without a valve between the density relay and electrical equipment of the density relay and disassembly.
the purpose of the invention is realized as follows:
The utility model provides an online calibration method of gas density relay, includes at least one heating device, at least one controller, at least one gas density detection sensor, at least one intelligent control unit and contact signal sampling unit, its characterized in that:
The heating device is arranged opposite to the gas density relay, the heating device is arranged in the shell of the gas density relay or outside the shell, and the heating device is connected with the controller; the heating device and the controller are configured to adjust the temperature rise and fall of the temperature compensation element of the gas density relay, so that the gas density relay generates a contact signal action;
The contact signal sampling unit is connected with the gas density relay and is configured to sample a contact signal of the gas density relay; wherein the contact signal comprises an alarm and/or a latch;
The intelligent control unit is respectively connected with the gas density detection sensor, the controller and the contact signal sampling unit, and is configured to complete control of the controller, pressure value acquisition, temperature value acquisition and/or gas density value acquisition, and detection of a contact signal action value and/or a contact signal return value of the gas density relay; the method comprises the following steps:
According to the set verification time and/or the verification instruction and the gas density value condition or/and the temperature value condition, under the condition that the gas density relay is allowed or/and can be verified:
the intelligent control unit is used for controlling the controller and further controlling the heating device to enable the temperature of the gas density relay to rise, and further enable the temperature of a temperature compensation element of the density relay to rise, so that the gas density relay generates contact action, the contact action is transmitted to the intelligent control unit through the contact signal sampling unit, the intelligent control unit obtains a gas density value according to a pressure value and a temperature value when the contact is acted, or directly obtains the gas density value, a contact signal action value of the gas density relay is detected, and the checking work of the contact signal action value of the gas density relay is completed;
after all the contact signal verification work is finished, the intelligent control unit turns off the controller, and then the heating device is turned off.
the online checking method of the gas density relay comprises the following steps:
according to the set verification time and/or the verification instruction and the gas density value condition or/and the temperature value condition, under the condition that the gas density relay is allowed or/and can be verified:
the contact signal sampling unit is adjusted to a checking state through the intelligent control unit, and in the checking state, the contact signal sampling unit cuts off a control loop of a contact signal of the gas density relay and connects a contact of the gas density relay body to the intelligent control unit;
the intelligent control unit is used for controlling the controller and further controlling the heating device to enable the temperature of the gas density relay to rise, and further enable the temperature of a temperature compensation element of the density relay to rise, so that the gas density relay generates contact action, the contact action is transmitted to the intelligent control unit through the contact signal sampling unit, the intelligent control unit obtains a gas density value according to a pressure value and a temperature value when the contact is acted, or directly obtains the gas density value, a contact signal action value of the gas density relay is detected, and the checking work of the contact signal action value of the gas density relay is completed;
The intelligent control unit is used for controlling the controller to control the heating device, so that the temperature of the gas density relay is reduced, the temperature of a temperature compensation element of the density relay is reduced, the contact point resetting of the gas density relay is realized, the contact point resetting is transmitted to the intelligent control unit through the contact point signal sampling unit, the intelligent control unit obtains a gas density value according to a pressure value and a temperature value when the contact point is reset, or directly obtains the gas density value, a contact point signal return value of the gas density relay is detected, and the checking work of the contact point signal return value of the gas density relay is completed;
after all contact signal check-up work is accomplished, the unit shutoff controller is controlled to the intelligence, and then the shutoff heating device to adjust to operating condition with contact signal sampling unit, the normal operating condition of operation is resumed to the control circuit of gas density relay's contact signal.
the online checking method of the gas density relay further comprises the following steps: a valve;
One end of the valve is communicated with electrical equipment, the other end of the valve is communicated with the gas density relay, and the valve is connected with the intelligent control unit;
according to the set verification time and/or the verification instruction and the gas density value condition or/and the temperature value condition, under the condition that the gas density relay is allowed or/and can be verified:
The contact signal sampling unit is adjusted to a checking state through the intelligent control unit, and in the checking state, the contact signal sampling unit cuts off a control loop of a contact signal of the gas density relay and connects a contact of the gas density relay body to the intelligent control unit;
the intelligent control unit controls the controller to further control the heating device to increase the temperature of the gas density relay, and after the temperature reaches a set value, the intelligent control unit closes the valve;
When the temperature or the pressure of the gas density relay is reduced to a preset value, the intelligent control unit controls the controller to further control the heating device, so that the temperature of the gas density relay is increased, the temperature of a temperature compensation element of the density relay is increased, the gas density relay generates contact action, the contact action is transmitted to the intelligent control unit through the contact signal sampling unit, the intelligent control unit obtains a gas density value according to a pressure value and a temperature value when the contact is acted, or directly obtains the gas density value, the contact signal action value of the gas density relay is detected, and the verification work of the contact signal action value of the gas density relay is completed;
after all contact signal check-up work is accomplished, the intelligence is controlled the unit and is opened the valve to and the intelligence is controlled the unit and is shut off the controller, and then turn off the heating device.
In the online calibration method of the gas density relay, the valve is also connected with a heating element A;
the heating element A is arranged on the gas density relay or a gas density relay mounting component and is connected with the intelligent control unit;
according to the set verification time and/or the verification instruction and the gas density value condition or/and the temperature value condition, under the condition that the gas density relay is allowed or/and can be verified:
The contact signal sampling unit is adjusted to a checking state through the intelligent control unit, and in the checking state, the contact signal sampling unit cuts off a control loop of a contact signal of the gas density relay and connects a contact of the gas density relay body to the intelligent control unit;
Controlling heating of the heating element A through an intelligent control unit to cause temperature change of gas in a gas chamber between the valve and the gas density relay, closing the valve through the intelligent control unit after a set value is reached, and then turning off the heating element A through the intelligent control unit;
after the temperature or the pressure of the air chamber is reduced to be proper, the intelligent control unit controls the controller to further control the heating device, so that the temperature of the gas density relay is increased, the temperature of a temperature compensation element of the density relay is increased, the gas density relay generates contact action, the contact action is transmitted to the intelligent control unit through the contact signal sampling unit, the intelligent control unit obtains a gas density value according to a pressure value and a temperature value when the contact is acted, or directly obtains the gas density value, the contact signal action value of the gas density relay is detected, and the verification work of the contact signal action value of the gas density relay is completed;
after all contact signal check-up work is accomplished, the intelligence is controlled the unit and is opened the valve to and the intelligence is controlled the unit and is shut off the controller, and then turn off the heating device.
the online checking method of the gas density relay comprises the following steps: valve, gas chamber and heating element a;
one end of the valve is communicated with electrical equipment, the other end of the valve is communicated with the gas density relay and the gas chamber, and the valve is connected with the intelligent control unit;
the gas chamber is communicated with the gas density relay, a heating element A is arranged outside or inside the gas chamber, and the heating element A is connected with the intelligent control unit;
According to the set verification time and/or the verification instruction and the gas density value condition or/and the temperature value condition, under the condition that the gas density relay is allowed or/and can be verified:
the contact signal sampling unit is adjusted to a checking state through the intelligent control unit, and in the checking state, the contact signal sampling unit cuts off a control loop of a contact signal of the gas density relay and connects a contact of the gas density relay body to the intelligent control unit;
heating the heating element A through an intelligent control unit to cause the temperature of the gas in the gas chamber to change, closing a valve through the intelligent control unit after a set value is reached, and then turning off the heating element A through the intelligent control unit;
after the temperature or the pressure of the air chamber is reduced to be proper, the intelligent control unit controls the controller to further control the heating device, so that the temperature of the gas density relay is increased, the temperature of a temperature compensation element of the density relay is increased, the gas density relay generates contact action, the contact action is transmitted to the intelligent control unit through the contact signal sampling unit, the intelligent control unit obtains a gas density value according to a pressure value and a temperature value when the contact is acted, or directly obtains the gas density value, the contact signal action value of the gas density relay is detected, and the verification work of the contact signal action value of the gas density relay is completed;
after all contact signal check-up work is accomplished, the intelligence is controlled the unit and is opened the valve to and the intelligence is controlled the unit and is shut off the controller, and then turn off the heating device.
the online checking method of the gas density relay comprises the following steps:
After the checking work of the contact signal action value of the gas density relay is finished, the intelligent control unit controls the controller to further control the heating device, so that the temperature of the gas density relay is reduced, the temperature of a temperature compensation element of the density relay is reduced, the gas density relay is subjected to contact resetting, the contact resetting is transmitted to the intelligent control unit through the contact signal sampling unit, the intelligent control unit obtains a gas density value according to a pressure value and a temperature value when the contact is reset, or directly obtains the gas density value, a contact signal return value of the gas density relay is detected, and the checking work of the contact signal return value of the gas density relay is finished;
After all contact signal check-up work accomplished, the unit is opened the valve is controlled to the intelligence to and the unit shutoff controller is controlled to the intelligence, and then turn-offs the heating device, and adjusts operating condition with contact signal sampling unit, and gas density relay's contact signal's control circuit resumes operation normal operating condition.
according to the online calibration method of the gas density relay, the intelligent control unit acquires the gas density value acquired by the gas density detection sensor when the gas density relay generates contact signal action or switching, and the calibration of the gas density relay is completed; alternatively, the first and second electrodes may be,
The intelligence accuse unit acquires gas density relay takes place contact signal action or when switching the pressure value and the temperature value that gas density detection sensor gathered to according to the pressure value that gas pressure-temperature characteristic conversion becomes corresponding 20 ℃, gas density value promptly, accomplish gas density relay's check-up.
according to the online calibration method of the gas density relay, the heating device comprises one of, but not limited to, a silicon rubber heater, a resistance wire, an electrothermal alloy, an electrothermal belt, an electrothermal couple, an electrothermal rod, a hot air blower, an infrared heating device, a microwave heating device, an electromagnetic induction heating device and a semiconductor; alternatively, the first and second electrodes may be,
the heating device also comprises a heat preservation part and a shell; alternatively, the first and second electrodes may be,
The heating device also comprises a heat preservation part, an insulating part and a shell; alternatively, the first and second electrodes may be,
the heating means is arranged adjacent to the temperature compensation element.
the controller comprises but is not limited to one of a temperature controller, a heating power regulator, a constant temperature controller, a temperature detector, a PID (proportion integration differentiation) controller, a controller combining PID (proportion integration differentiation) and fuzzy control, a variable frequency controller and an intelligent controller.
the online checking method of the gas density relay comprises at least two heating devices, wherein one heating device is used for roughly adjusting the temperature, and the temperature of a temperature compensation element can be quickly increased to be close to a set temperature value; the other heating device is used for temperature fine adjustment and can accurately adjust the temperature of the temperature compensation element to slowly rise or fall.
According to the online calibration method of the gas density relay, the controller is arranged inside or outside the gas density relay body or on the shell.
The online calibration method of the gas density relay comprises the following steps that the gas density detection sensor comprises at least one pressure sensor and at least one temperature sensor; alternatively, the first and second electrodes may be,
a gas density transmitter consisting of a pressure sensor and a temperature sensor is adopted; alternatively, the first and second electrodes may be,
A density detection sensor adopting quartz tuning fork technology.
According to the online calibration method of the gas density relay, the temperature sensor is arranged on a gas density relay shell, or in the gas density relay shell, or near a temperature compensation element in the gas density relay shell, or at an oil filling port of the gas density relay, or at a vent port of the gas density relay.
according to the online calibration method of the gas density relay, the response speeds of the temperature sensor and the temperature compensation element of the gas density relay to temperature changes are close to or consistent with each other.
The online checking method for the gas density relay comprises the following steps of detecting the pressure of the gas density relay, and carrying out online checking on the gas density relay.
The online checking method of the gas density relay further comprises the following steps: the pressure adjusting mechanism is communicated with the gas density relay through a gas path of the pressure adjusting mechanism during verification; the pressure regulating mechanism is configured to regulate the pressure rise and fall of the gas density relay, and then the gas density relay is matched with or/and combined with a controller and a heating device to generate contact signal action.
In the online calibration method of the gas density relay, the contact signal sampling unit samples the contact signal of the gas density relay, and the sampling requirements of the contact signal sampling unit are as follows:
The contact signal sampling unit is provided with at least one group of independent sampling contacts, and at the same time, at least one contact is automatically verified, and continuous measurement is carried out without replacing the contact or reselecting the contact; wherein the content of the first and second substances,
The contacts include, but are not limited to, one of an alarm contact, an alarm contact + latching 1 contact + latching 2 contact, an alarm contact + latching contact + overpressure contact.
according to the online checking method of the gas density relay, the test data and/or the checking result are/is transmitted remotely through the communication module.
According to the online calibration method of the gas density relay, the intelligent control unit is controlled through field control and/or background control and/or combined control of the field and the background.
the online checking method of the gas density relay further comprises a contact resistance detection unit; during checking, the contact resistance detection unit is connected with the contact point signal; the contact resistance detection unit can detect the contact resistance value of the contact of the gas density relay.
According to the online checking method of the gas density relay, the online checking contact signal sampling unit is used for testing that the voltage of the contact signal action value or the switching value of the contact signal action value is not lower than 24V, namely, during checking, the voltage of not lower than 24V is applied between corresponding terminals of the contact signal.
the online checking method of the gas density relay comprises the steps that a contact signal of the gas density relay is a normally-open density relay, and the online checking contact signal sampling unit comprises a first connecting circuit and a second connecting circuit, wherein the first connecting circuit is connected with the contact signal and contact signal control circuit of the gas density relay, and the second connecting circuit is connected with the contact signal and intelligent control unit of the gas density relay; in a non-verification state, the second connecting circuit is disconnected or isolated, and the first connecting circuit is closed; in a checking state, the online checking contact signal sampling unit cuts off the first connecting circuit, is communicated with the second connecting circuit and connects the contact signal of the gas density relay with the intelligent control unit; alternatively, the first and second electrodes may be,
the contact signal of the gas density relay is a normally closed density relay, the online checking contact signal sampling unit comprises a first connecting circuit and a second connecting circuit, the first connecting circuit is connected with the contact signal and contact signal control loop of the gas density relay, and the second connecting circuit is connected with the contact signal and the intelligent control unit of the gas density relay; in a non-verification state, the second connecting circuit is disconnected or isolated, and the first connecting circuit is closed; under the check-up state, online check-up contact signal sampling unit is closed contact signal control circuit cuts off gas density relay's contact signal and contact signal control circuit's being connected, the intercommunication second connecting circuit will gas density relay's contact signal with the intelligence is controlled the unit and is connected.
According to the online calibration method of the gas density relay, through the control of the intelligent control unit, when the action value of a contact signal of the gas density relay is measured, the temperature change speed is not more than 1.0 ℃ per second when the action value is approached, namely the temperature is required to be stably increased or decreased.
The online calibration method of the gas density relay further comprises a mutual self-calibration unit, and the intelligent control unit realizes maintenance-free of the gas density relay by comparing data detected by the mutual self-calibration unit; alternatively, the first and second electrodes may be,
The detected data are compared through the intelligent control unit and the mutual self-correction unit, and maintenance-free of the gas density relay is achieved.
In the online calibration method of the gas density relay, the heating device consists of a plurality of heating devices with the same or different powers; or a heating device with adjustable heating power.
according to the online checking method of the gas density relay, the arrangement positions of the plurality of heating devices can be the same or different, and the heating devices can be reasonably arranged according to needs.
according to the online calibration method of the gas density relay, the temperature rise and fall mode of the controller is multi-pole control; alternatively, the first and second electrodes may be,
the temperature rising and falling mode of the controller is a gradual approximation method.
according to the online calibration method of the gas density relay, the intelligent control unit further comprises a depth calculation unit, and the depth calculation unit can provide an air source with proper initial density calibration for the gas density relay to be calibrated according to an environmental temperature value, a gas density value or a pressure value of electrical equipment and a gas pressure-temperature characteristic; or, the intelligence is controlled the unit according to the ambient temperature value when the check-up, the gas pressure value of electrical equipment air chamber the temperature value that gas density relay needs the check-up, according to gas pressure-temperature characteristic, for required check-up gas density relay provides the suitable air supply of initial density of a check-up.
in the online calibration method of the gas density relay, the intelligent control unit acquires the gas density value acquired by the gas density detection sensor; or, the intelligence accuse unit acquires the pressure value and the temperature value that gas density detection sensor gathered accomplish the on-line monitoring of gas density relay to the electrical equipment who monitors.
The online calibration method of the gas density relay is characterized in that the intelligent control unit calculates the gas density value by adopting an averaging method, and the averaging method comprises the following steps: setting acquisition frequency in a set time interval, and carrying out average value calculation processing on N gas density values of different acquired time points to obtain the gas density values; alternatively, the first and second electrodes may be,
setting temperature interval step length in a set time interval, and carrying out average value calculation processing on N density values of different temperature values acquired in all temperature ranges to obtain gas density values; or setting a pressure interval step length in a set time interval, and carrying out average value calculation processing on N density values of different pressure values acquired in all pressure variation ranges to obtain a gas density value;
Wherein N is a positive integer greater than or equal to 1.
in the online calibration method of the gas density relay, the intelligent control unit has a plurality of gas density values at different time intervals; and the gas density values of the plurality of different time intervals are uploaded to target equipment or a target platform through a communication module.
According to the online calibration method of the gas density relay, the intelligent control unit processes the calibration result in the following mode: uploading the data to a background or target device in a wired or wireless mode through a communication module; or, a checking result signal is output and uploaded to the background or target equipment through an alarm signal of the gas density relay; or, in situ annunciation or alarm.
according to the online calibration method of the gas density relay, the intelligent control unit carries out data processing according to whether the tested relay is an absolute pressure relay or a relative pressure relay, whether a sensor for measurement is an absolute pressure sensor or a relative pressure sensor, a temperature value during testing and a pressure-temperature characteristic relation of gas, a corresponding pressure value of 20 ℃ is obtained, and accurate testing of the performance of the gas density relay is achieved.
the online calibration method of the gas density relay comprises the following steps of:
1) When the absolute pressure sensor is used for measuring the absolute pressure relay, directly converting the measured absolute pressure value into a corresponding absolute pressure value of 20 ℃ according to the temperature value during testing and the pressure-temperature characteristic relation of gas;
2) when a relative pressure sensor is used for measuring a relative pressure relay, directly converting the measured relative pressure value into a corresponding relative pressure value of 20 ℃ according to the temperature value during testing and the pressure-temperature characteristic relation of gas;
3) when the absolute pressure sensor is used for measuring the relative pressure relay, firstly, the measured absolute pressure value is converted into a relative pressure value, and the conversion relation is as follows: the relative pressure of the P test is the absolute pressure of the P test-P local air pressure, and then the relative pressure value of 20 ℃ is converted according to the temperature value and the pressure-temperature characteristic relation of the air during the test;
4) when the relative pressure sensor is used for measuring the absolute pressure relay, firstly, the measured relative pressure value is converted into an absolute pressure value, and the conversion relation is as follows: and the absolute pressure of the P test is equal to the relative pressure of the P test plus the local air pressure of P, and then the absolute pressure value of 20 ℃ is converted according to the temperature value and the pressure-temperature characteristic relation of the air during the test.
in the online calibration method of the gas density relay, the data processing content of the intelligent control unit further includes:
5) When the absolute pressure sensor is used for measuring the relative pressure relay, firstly, the measured absolute pressure value is converted into a corresponding 20 ℃ absolute pressure value according to the temperature value during testing and the pressure-temperature characteristic relation of gas, and then the corresponding 20 ℃ relative pressure value is converted, wherein the conversion relation is as follows:
the relative pressure tested at P20 is equal to the absolute pressure tested at P20-P local air pressure;
6) when the relative pressure sensor is used for measuring the absolute pressure relay, firstly, the measured relative pressure value is converted into a corresponding 20 ℃ relative pressure value according to the temperature value during testing and the pressure-temperature characteristic relation of gas, and then the corresponding 20 ℃ absolute pressure value is converted, wherein the conversion relation is as follows:
the absolute pressure of the P20 test is equal to the relative pressure of the P20 test + P local air pressure.
the online checking method of the gas density relay can not only avoid a valve between the density relay and the electrical equipment thereof, but also avoid disassembly, and can also carry out online checking on the gas density relay. A brand new working principle: during the check-up, set up heating device and gas density relay relatively, through controller control heating device, and then adjust the temperature lift of the temperature compensation component of gas density relay body makes gas density relay takes place the contact signal action, obtains gas density value according to pressure value, the temperature value when the contact action, detects out the contact signal action value of gas density relay, accomplishes the check-up work of gas density relay's contact signal action value.
Drawings
FIG. 1 is a schematic diagram of an online verification method according to a first embodiment of the present invention;
Fig. 2 is a schematic structural diagram of a gas density relay according to a first embodiment of the present invention;
FIG. 3 is a schematic diagram of an online verification method according to a first embodiment of the invention;
FIG. 4 is a schematic diagram of an online verification method according to a second embodiment of the present invention;
Fig. 5 is a schematic structural diagram of a gas density relay according to a third embodiment of the present invention;
fig. 6 is a schematic structural diagram of an online verification method according to a fourth embodiment of the present invention;
Fig. 7 is a schematic structural diagram of an online verification method according to a fifth embodiment of the present invention.
Detailed Description
The method for on-line verification of a gas density relay (SF6) according to the present invention is further illustrated by the following examples. Referring to fig. 1 and 2, fig. 1 is a schematic diagram illustrating an online calibration method of a gas density relay according to an embodiment of the present invention; fig. 2 is a schematic structural diagram of an online verification method for a gas density relay according to an embodiment of the present invention. The invention discloses an online checking method of a gas density relay, which comprises at least one heating device 501, at least one controller 504, at least one gas density detection sensor (in the embodiment, the at least one gas density detection sensor comprises at least one pressure sensor 2 and at least one temperature sensor 3), a valve 4, a contact signal sampling unit 6, an intelligent control unit 7, electrical equipment 8, a multi-way connector 9, an air supply interface 10, an air chamber 1107, a heating element A1108, a heat preservation part 1109 and a shell 1111. One end of the valve 4 is communicated with an electrical device 8, the other end of the valve 4 is communicated with the gas density relay 1 and the gas chamber 1107, and the valve 4 is connected with the intelligent control unit 7; the air chamber 1107 is communicated with the gas density relay 1, a heating element A1108 is arranged outside or inside the air chamber 1107, and the heating element A1108 is connected with the intelligent control unit 7; heating element A1108 is externally provided with a thermal insulator 1109 and a housing 1111. The gas density relay 1 is arranged on the multi-way joint 9; the pressure sensor 2 and the temperature sensor 3 are arranged on the body of the gas density relay 1, and the pressure sensor 2 is communicated with the gas density relay 1 on a gas path; the controller 504 is arranged on the density relay 1 shell; the heating device 501 also comprises a heat preservation piece 502 and a shell 503, the heating device 501 is controlled by a controller 504, the controller 504 is controlled by an intelligent control unit 7, and in addition, the controller 504 and the intelligent control unit 7 can be arranged or designed together. The air chamber 1107, the heating element A1108, the heat preservation part 1109 and the shell 1111 are arranged on the multi-way joint 9, and the air chamber 1107 is communicated with the gas density relay body; the online check joint signal sampling unit 6 and the intelligent control unit 7 are arranged together. The pressure sensor 2, the temperature sensor 3, the valve 4, the controller 504 and the heating element a1108 are respectively connected with an intelligent control unit 7. The air supply interface 10 is communicated with the multi-way joint 9.
referring to fig. 3, fig. 3 is a schematic diagram of an online calibration method of a gas density relay according to an embodiment of the present invention, and the operation principle of the online calibration method is as follows: the online checking contact signal sampling unit 6 is adjusted to a checking state through the intelligent control unit 7, and in the checking state, the online checking contact signal sampling unit 6 cuts off a control loop of a contact signal of the gas density relay 1 and connects a contact of the gas density relay 1 (body) to the intelligent control unit 7; then through the control of intelligence accuse unit 7 to heating element A1108, heat heating element A1108, result in the temperature change of the gas in the gas chamber 1107, and then accomplish the density of its gas and go up and down, reached the setting value after, intelligence accuse unit 7 is to the control of valve 4, closes valve 4, cuts off heating element A1108 simultaneously. When the temperature of the gas in the gas chamber 1107 is reduced, the pressure of the gas in the gas chamber 1107 is also reduced, and a gas source with proper initial density (pressure) can be provided for the gas density relay 1 to be verified. Then, the intelligent control unit 7 operates or controls the controller 504, and further controls the heating device 501, so that the temperature of the gas density relay 1 is increased, and the temperature of the temperature compensation element of the density relay is increased, so that the gas density relay generates a contact action, the contact action is transmitted to the intelligent control unit 7 through the online checking contact signal sampling unit 6, the intelligent control unit 7 obtains a gas density value according to a pressure value and a temperature value when the contact is acted, or directly obtains the gas density value, the contact signal action value of the gas density relay is detected, and the checking work of the contact signal action value of the gas density relay is completed. For example, for a gas density relay with density relay parameters of 0.6/0.52/0.50MPa (rated value of 0.6 MPa/alarm pressure value of 0.52 MPa/alarm pressure value of 0.50MPa, relative pressure), when checking an air source with proper initial density (pressure), that is, the air pressure of the air chamber 1107 is 0.5562MPa (relative pressure), in the checking system, the pressure value is unchanged, when the temperature rises to 29.5 ℃, the alarm contact thereof acts, the intelligent control unit 7 can obtain an alarm contact action value 0.5317MPa (relative pressure) of the gas density relay according to the pressure value 0.5562MPa (relative pressure) and the temperature value of 29.5 ℃ when the contact acts, and the intelligent control unit 7 can obtain an error of the alarm contact action value: and 0.0117MPa (0.5317MPa-0.52MPa is 0.0117MPa), and the checking of the alarm contact action value of the density relay is completed.
the intelligent control unit 7 further comprises a depth calculation unit, and the depth calculation unit can provide an air source with proper initial density for the gas density relay to be verified according to an environmental temperature value, a gas density value or a pressure value of the electrical equipment and a gas pressure-temperature characteristic; or, the intelligence is controlled the unit according to the ambient temperature value when the check-up, the gas pressure value of electrical equipment air chamber the temperature value that gas density relay needs the check-up, according to gas pressure-temperature characteristic, can be for required check-up gas density relay provides the suitable air supply of initial density of a check-up.
Then, through the operation or control of intelligence accuse unit 7 to controller 504, and then control heating device 501, make the temperature of gas density relay body 1 reduce, and then the temperature of the temperature compensating element of density relay reduces, make gas density relay take place the contact and reset, the contact resets and transmits intelligence accuse unit 7 through online check contact signal sampling unit 6, intelligence accuse unit 7 obtains gas density value according to the pressure value when the contact resets, the temperature value, or directly obtains gas density value, detect out the contact signal return value of gas density relay, accomplish the check-up work of the contact signal return value of gas density relay. For example, for the gas density relay with the density relay parameter of 0.6/0.52/0.50MPa (rated value of 0.6 MPa/alarm pressure value of 0.52 MPa/alarm pressure value of 0.50MPa, relative pressure), when checking the gas source with proper initial density (pressure), that is, the gas pressure of the gas chamber 1107 is 0.5562MPa (relative pressure), and also in the checking system, the pressure value is unchanged (or slightly changed), when the temperature is reduced to 24.8 ℃, the alarm contact is reset, the intelligent control unit 7 can obtain the return value of the alarm contact of the gas density relay of 0.5435MPa (relative pressure) according to the pressure value 0.5562MPa (relative pressure) and the temperature value of 3524.8 ℃ when the contact is reset, and the intelligent control unit 7 can obtain the switching difference of the alarm contact: 0.0118MPa (0.5435MPa-0.5317MPa is 0.0118MPa), thus basically completing the verification of the alarm contact action value of the density relay. The intelligent control unit 7 can determine the performance condition (such as pass or fail) of the verified gas density relay according to the requirement and the verification result (verification data). The verification is repeated for a plurality of times (for example, 2 to 3 times), and then the average value is calculated, so that the verification work of the gas density relay body 1 is completed. Then, after all contact signal check-up work is accomplished, the unit is controlled to the intelligence and the valve is opened, and the unit 7 shutoff controller 5 is controlled to the intelligence simultaneously, and then turn-offs heating device 501 to adjust to operating condition with online check-up contact signal sampling unit 6, the normal operating condition of operation is resumed to the control circuit of gas density relay's contact signal. In this embodiment, the intelligent control unit 7 can open the valve 4, or the intelligent control unit 7 can turn off the controller 504 and the heating device 501 flexibly, that is, the valve 4 can be opened first, and then the controller and the heating device can be turned off; or the controller and the heating device can be turned off first, and then the valve 4 is opened; or may operate simultaneously.
The heating device 501 is arranged opposite to the gas density relay 1, and can be arranged in the gas density relay casing or outside the casing. The temperature sensor 3 is typically arranged in or on the housing of the density relay 1. The heating device 501 and the controller 504 are configured to adjust the temperature rise and fall of the temperature compensation element of the gas density relay 1, so that the gas density relay 1 generates a contact signal action; the contact signal sampling unit 6 is connected with the gas density relay 1 and is configured to sample a contact signal of the gas density relay 1; wherein the contact signal comprises an alarm and/or a latch; the intelligent control unit 7 is respectively connected with the pressure sensor 2, the temperature sensor 3, the controller 504, the contact signal sampling unit 6 and the heating element a, and is configured to complete control of the controller 504, pressure value acquisition, temperature value acquisition and/or gas density value acquisition, and detection of a contact signal action value and/or a contact signal return value of the gas density relay 1; the heating device 501 further comprises a heat preservation member 502 and a shell 503. The controller 504 may use PID control, or a combination of PID and fuzzy control. The heating device 501 electrically heats the working power range controlled by the controller 504 and the temperature rise and fall range setting value. The variation amplitude of the temperature is controlled by different power levels. The degree of deviation may be set to advance heating or cooling. The temperature of the gas density relay temperature compensation element is measured by the intelligent control unit 7 and the controller 504, and when the action value of the gas density relay contact signal is measured, the temperature change speed is not more than 1.0 ℃ per second (even not more than 0.5 ℃ per second) when the action value is approached, or the requirement is set according to the requirement), namely the temperature requirement is steadily increased or decreased. The temperature rise and fall manner of the controller 504 is a gradual approximation method, that is: specifically, a gradual approximation (or approximation, or gradual) method can be used to make the temperature rise or fall smoothly, for example, when the temperature reaches a set range, the heating can be stopped, and after a while, the heating with low power is performed, so that the temperature change speed is not more than 1.0 ℃ per second (even not more than 0.5 ℃ per second) when the temperature approaches the action value, or the requirement is set as required, that is, the temperature is required to rise or fall smoothly.
The intelligent control unit 7 acquires the gas density value acquired by the gas density detection sensors (2 and 3); or, intelligence accuse unit 7 acquires the pressure value and the temperature value that gas density detection sensor gathered accomplish the on-line monitoring of gas density relay to the gas density of the electrical equipment who monitors.
During verification, if the density is reduced or increased greatly, the contact of the gas density relay still has no signal, and the intelligent control unit 7 can perform abnormity prompting or notification.
the heating device includes, but is not limited to, one of a silicone rubber heater (such as a silicone rubber heating plate, a silicone rubber heating band, a silicone rubber heating strip), a resistance wire, an electrothermal alloy, an electrothermal band, an electrothermal couple, an electrothermal rod, a hot air blower, an infrared heating device, a microwave heating device, an electromagnetic induction heating device, a semiconductor, an electrothermal wire, an electrothermal plate, an electrothermal cable, an electrothermal disk, an electric heating coil, an electric tracing band, an electric heating core, a mica heating sheet, a ceramic heating sheet, a silicone rod, an electrothermal wire, and an electric mesh belt.
the controller includes, but is not limited to, one of a temperature controller, a heating power regulator, a thermostatic controller, a temperature detector, a PID controller, a controller combining PID and fuzzy control, a frequency conversion controller, an intelligent controller, an electromagnetic relay and an intermediate relay.
fig. 4 is a schematic structural diagram of an online verification method for a gas density relay according to a second embodiment of the present invention, and the online verification method for an in-situ gas density relay includes at least one heating device 501, at least one controller 504, at least one gas density detection sensor (pressure sensor 2, temperature sensor 3), an intelligent control unit 7, and a contact signal sampling unit 6. The method comprises the following steps: the density relay 1 is arranged on the electrical equipment 8 through a multi-way joint 9, and the air supplementing joint 10 is arranged on the multi-way joint 9. The heating device 501 is disposed opposite to the gas density relay 1. The heating device 501 is configured to adjust the temperature of the temperature compensation element of the gas density relay to raise or lower, so that the gas density relay generates a contact signal action; the contact signal sampling unit 6 is connected with the gas density relay 1 and is configured to sample a contact signal of the gas density relay 1; wherein the contact signal comprises an alarm and/or a latch; an intelligent control unit 7, respectively connected to the gas density detection sensors (pressure sensor 2, temperature sensor 3), the controller 504 and the contact signal sampling unit 6, and configured to complete control of the controller 504, pressure value acquisition, temperature value acquisition, and/or gas density value acquisition, and detect a contact signal action value and/or a contact signal return value of the gas density relay 1; the method comprises the following steps:
according to the set verification time and the gas density value condition or/and the temperature value condition, under the condition that the gas density relay is allowed or/and can be verified:
The intelligent control unit 7 controls the controller 504 to further control the heating device 501, so that the temperature of the gas density relay 1 is increased, the temperature of a temperature compensation element of the density relay 1 is increased, the gas density relay 1 generates contact actions, the contact actions are transmitted to the intelligent control unit through the contact signal sampling unit, the intelligent control unit obtains a gas density value according to a pressure value and a temperature value when the contact actions are carried out, or directly obtains the gas density value, detects a contact signal action value of the gas density relay, and completes the verification work of the contact signal action value of the gas density relay; and after all the contact signal verification work is finished, the intelligent control unit turns off the controller. Unlike the first embodiment, this embodiment has no valve 4 and no heating element a.
referring to fig. 5, fig. 5 is a schematic structural diagram of an online verification method for a gas density relay according to a third embodiment of the present invention, including: the gas density relay comprises a gas density relay 1, a first pressure sensor 21, a second pressure sensor 22, a first temperature sensor 31, a second temperature sensor 32, a valve 4, a heating device 501, a controller 504, an online check joint signal sampling unit 6, an intelligent control unit 7, a multi-way joint 9, a gas supplementing interface 10, a gas chamber 1107, a heating element A1108, a heat preservation piece 1109 and a shell 1111. The method comprises the following steps: the density relay 1 is arranged on the electrical equipment 8 through a multi-way joint 9, and the air supplementing joint 10 is arranged on the multi-way joint 9. The heating device 501 is arranged opposite to the gas density relay 1, one end of the self-sealing valve is connected to the electrical equipment in a sealing mode, and the other end of the self-sealing valve is connected with the multi-way connector 9 through the valve 4. The gas density relay 1, the second pressure sensor 22, the gas chamber 1107 and the gas supplementing interface 10 are arranged on the multi-way joint 9; the first pressure sensor 21, the first temperature sensor 31, the second temperature sensor 32, and the controller 504 are provided in the gas density relay 1. The first pressure sensor 21, the second pressure sensor 22, the first temperature sensor 31, the second temperature sensor 32, the valve 4 and the heating element a1108 are respectively connected with the intelligent control unit 7. The first pressure sensor 21, the second pressure sensor 22 and the gas density relay 1 are communicated on a gas path.
different from the first embodiment, there are two pressure sensors, namely a first pressure sensor 21 and a second pressure sensor 22; the number of the temperature sensors is two, namely a first temperature sensor 31 and a second temperature sensor 32. The present embodiment provides a plurality of pressure sensors and temperature sensors for the purpose of: the pressure values monitored by the first pressure sensor 21 and the second pressure sensor 22 can be compared and verified with each other; the temperature values monitored by the first temperature sensor 31 and the second temperature sensor 32 can be compared and verified with each other; the density value P120 obtained by monitoring the first pressure sensor 21 and the first temperature sensor 31 is compared with the density value P220 obtained by monitoring the second pressure sensor 22 and the second temperature sensor 32, and mutual verification is carried out; even the density value Pe20 of the rated value of the gas density relay body 1 can be obtained through online verification, and comparison and mutual verification are carried out between the density values. In this embodiment, the controller 504 and the intelligent control unit 7 are designed as a whole, i.e. the controller 504 is included in the intelligent control unit 7.
In addition, in the technology of the present invention, there are two pressure sensors, which are respectively a first pressure sensor 21 and a second pressure sensor 22; the number of the temperature sensors is two, namely a first temperature sensor 31 and a second temperature sensor 32. The first pressure sensor 21 and the second pressure sensor 22 are respectively provided on both sides of the multi-way joint 9 or on both ends of the valve 4. The technology of the invention has a safety protection function, and specifically comprises the following steps: 1) when the density values monitored by the first pressure sensor 21 and the first temperature sensor 31 or the second pressure sensor 22 and the second temperature sensor 32 are lower than the set values, the gas density relay automatically does not check the gas density relay body any more, and sends out a notification signal. For example, when the gas density value of the plant is less than the set value, it is not verified. The check can only be carried out when the gas density value of the equipment is not less than (blocking pressure +0.02 MPa). The contact signal alarm has a status indication. 2) Or during the verification, the valve 4 is closed at the moment, and when the density value obtained by monitoring the second pressure sensor 22 and the second temperature sensor 32 is lower than the set value, the gas density relay automatically does not verify the gas density relay 1 any more, and simultaneously sends out a notification signal (gas leakage). For example, when the gas density value of the plant is less than the set value (lock pressure +0.02MPa), it is not verified. The set value can be set arbitrarily as required. Meanwhile, the gas density relay is also provided with a plurality of pressure sensors and temperature sensors for mutual verification, and the sensors and the gas density relay are mutually verified, so that the gas density relay is ensured to normally work. Namely, the pressure values monitored by the first pressure sensor 21 and the second pressure sensor 22 are compared and verified with each other; comparing the temperature values obtained by monitoring by the first temperature sensor 31 and the second temperature sensor 32, and checking each other; the density value P120 obtained by monitoring the first pressure sensor 21 and the first temperature sensor 31 is compared with the density value P220 obtained by monitoring the second pressure sensor 22 and the second temperature sensor 32, and mutual verification is carried out; even the density value Pe20 of the rated value of the gas density relay body 1 can be verified, compared with each other and verified with each other.
referring to fig. 6, fig. 6 is a schematic structural diagram of an online verification method for a gas density relay according to a fourth embodiment of the present invention, further including: a valve 4; one end of the valve 4 is communicated with an electrical device 8, the other end of the valve 4 is communicated with the gas density relay 1, and the valve 4 is connected with an intelligent control unit 7;
According to the set checking time and the gas density value condition or/and the temperature value condition, under the condition that the gas density relay is allowed or/and can be checked, for example, in winter, the gas pressure of the electrical equipment is lower;
The contact signal sampling unit 6 is adjusted to a checking state through the intelligent control unit 7, and in the checking state, the contact signal sampling unit 6 cuts off a control loop of a contact signal of the gas density relay 1 and connects a contact of the gas density relay 1 body to the intelligent control unit;
The intelligent control unit 7 controls the controller 504 and further controls the heating device 501 to raise the temperature of the gas in the gas density relay, and after the temperature of the gas reaches a set value (for example, the set value is 80 ℃), the intelligent control unit closes the valve;
after the temperature or the pressure of the gas density relay is reduced to a proper value (for example, the ambient temperature is 10 ℃), the intelligent control unit controls the controller, and then the heating device 501 is controlled, so that the temperature of the gas density relay is increased, the temperature of the temperature compensation element of the density relay is increased (assuming that the height is 46.8 ℃), the gas density relay 1 is subjected to contact point action, the contact point action is transmitted to the intelligent control unit 7 through the contact point signal sampling unit 6, the intelligent control unit 7 obtains a gas density value according to the pressure value and the temperature value when the contact point is acted, or directly obtains the gas density value, detects the contact point signal action value of the gas density relay, and completes the verification work of the contact point signal action value of the gas density relay;
After all the contact signal verification operations are completed, the intelligent control unit 7 opens the valve 4, and the intelligent control unit turns off the controller 504, thereby turning off the heating device 501.
referring to fig. 7, fig. 7 is a schematic structural diagram of an online verification method for a gas density relay according to a fifth embodiment of the present invention, where the present embodiment further includes a valve 4 and a heating element a 1108; one end of the valve 4 is connected with a connector 1010 (the connector 1010 is communicated with electrical equipment), the other end of the valve 4 is communicated with the gas density relay 1 body, and the valve 4 is connected with an intelligent control unit 7; the heating element A1108 is arranged on a connecting pipe 1011 of the gas density relay, and the inside of the connecting pipe 1011 is hollow; the heating element A is connected with the intelligent control unit; a heat preservation part 1109 is arranged outside the heating element A1108; according to the set verification time and the gas density value condition or/and the temperature value condition, under the condition that the gas density relay is allowed or/and can be verified:
the contact signal sampling unit 6 is adjusted to a checking state through the intelligent control unit 7, and in the checking state, the contact signal sampling unit 6 cuts off a control loop of a contact signal of the gas density relay 1 and connects a contact of the gas density relay body to the intelligent control unit 7;
heating the heating element a1108 by the intelligent control unit 7, causing the temperature of the gas in the gas chamber inside the connecting pipe 1011 between the valve 4 and the gas density relay 1 to change, closing the valve 4 by the intelligent control unit 7 after reaching a set value (for example, the set value temperature is 70 ℃), and then turning off the heating element a1108 by the intelligent control unit 7;
after the temperature or the pressure of the air chamber inside the connecting pipe 1011 is reduced to a proper value (for example, the ambient temperature is-10 ℃), the intelligent control unit 7 controls the controller 504, the heating device 501 is further controlled, the temperature of the gas density relay is increased, the temperature of the temperature compensation element of the density relay 1 is further increased (assuming that the height is 38.5 ℃), the gas density relay 1 generates contact point actions, the contact point actions are transmitted to the intelligent control unit 7 through the contact point signal sampling unit 6, the intelligent control unit 7 obtains a gas density value according to the pressure value and the temperature value during the contact point actions or directly obtains the gas density value, detects the contact point signal action value of the gas density relay, and completes the verification work of the contact point signal action value of the gas density relay; in addition, in the present embodiment, the controller 504 and the intelligent control unit 7 are also designed as one body, that is, the controller 504 is included in the intelligent control unit 7.
After all the contact signal verification operations are completed, the intelligent control unit 7 opens the valve 4, and the intelligent control unit 7 turns off the controller 5, thereby turning off the heating device 501.
For methods similar to the present embodiment, heating element A1108 may be provided in a multi-way joint, the aeration valve 10 provided on a multi-way joint, and so forth.
the gas chamber 1107 and the heating element a1108 in the online calibration method can be replaced by a gas supply mechanism which can provide a gas source with a certain pressure, so that the online calibration method can be conveniently designed, manufactured and produced, and the online calibration method can include, but is not limited to, one of a gas density calibration device (calibrator) with an online calibration function, a portable gas density calibration device (calibrator) for field use and a gas density calibration device (calibrator) for a laboratory use.
the gas chamber 1107 and the heating element A1108 in the online calibration method can be replaced by a pressure adjusting mechanism, and the pressure adjusting mechanism can provide a gas source with a proper initial pressure, so that the design, manufacture and production can be convenient, including but not limited to one of a gas density relay with an online self-calibration function, a gas density relay with a self-calibration function, a gas density monitoring device with an online self-calibration function, a gas density monitor with an online self-calibration function, a gas density transmitter with an online self-calibration function, a gas density calibration device (calibrator) with an online calibration function, a portable gas density calibration device (calibrator) for field use and a gas density calibration device (calibrator) for a laboratory use. There are other embodiments, which are not listed here.
In summary, an online calibration method for a gas density relay can be used to design, manufacture, and produce, including but not limited to, one of a gas density relay with an online self-calibration function, a gas density relay with a self-calibration function, a gas density monitoring device with an online self-calibration function, a gas density monitor with an online self-calibration function, a gas density transmitter with an online self-calibration function, a gas density calibration device (calibrator) with an online calibration function, a portable gas density calibration device (calibrator) for a field, and a gas density calibration device (calibrator) for a laboratory.
and measuring the absolute pressure relay by using an absolute pressure sensor to obtain an absolute pressure value, and then automatically converting the absolute pressure value into a corresponding 20 ℃ absolute pressure value according to a temperature value (obtained by the temperature sensor) during testing and a pressure-temperature characteristic relation of SF6 gas to finish the performance verification of the SF6 gas density relay.
If the absolute pressure relay is represented by an absolute pressure value, the test result is the corresponding absolute pressure value of 20 ℃; if the pressure is expressed by relative pressure value, the test result can be converted into corresponding relative pressure value at 20 ℃, and the conversion relation between absolute pressure and relative pressure is as follows: absolute pressure P + relative pressure P standard atmospheric pressure;
And measuring the relative pressure relay by using a relative pressure sensor to obtain a relative pressure value, and then automatically converting the relative pressure value into a corresponding 20 ℃ relative pressure value according to the temperature value during testing and the pressure-temperature characteristic relation of the SF6 gas to finish the performance verification of the SF6 gas density relay.
if the relative pressure relay is represented by a relative pressure value, the test result is also the corresponding relative pressure value of 20 ℃; if the absolute pressure value is used for representing, the test result can also be converted into a corresponding absolute pressure value of 20 ℃, and the conversion relation between the absolute pressure and the relative pressure is as follows: p absolute pressure + P standard atmospheric pressure.
The heating device 501 and the controller 502 in the present online verification method may be replaced by a device including a micro oven, a temperature thermostat generator.
it will be appreciated by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.

Claims (35)

1. The utility model provides an online calibration method of gas density relay, includes at least one heating device, at least one controller, at least one gas density detection sensor, at least one intelligent control unit and contact signal sampling unit, its characterized in that:
the heating device is arranged opposite to the gas density relay, the heating device is arranged in the shell of the gas density relay or outside the shell, and the heating device is connected with the controller; the heating device and the controller are configured to adjust the temperature rise and fall of the temperature compensation element of the gas density relay, so that the gas density relay generates a contact signal action;
The contact signal sampling unit is connected with the gas density relay and is configured to sample a contact signal of the gas density relay; wherein the contact signal comprises an alarm and/or a latch;
the intelligent control unit is respectively connected with the gas density detection sensor, the controller and the contact signal sampling unit, and is configured to complete control of the controller, pressure value acquisition, temperature value acquisition and/or gas density value acquisition, and detection of a contact signal action value and/or a contact signal return value of the gas density relay; the method comprises the following steps:
According to the set verification time and/or the verification instruction and the gas density value condition or/and the temperature value condition, under the condition that the gas density relay is allowed or/and can be verified:
The intelligent control unit is used for controlling the controller and further controlling the heating device to enable the temperature of the gas density relay to rise, and further enable the temperature of a temperature compensation element of the density relay to rise, so that the gas density relay generates contact action, the contact action is transmitted to the intelligent control unit through the contact signal sampling unit, the intelligent control unit obtains a gas density value according to a pressure value and a temperature value when the contact is acted, or directly obtains the gas density value, a contact signal action value of the gas density relay is detected, and the checking work of the contact signal action value of the gas density relay is completed;
After all the contact signal verification work is finished, the intelligent control unit turns off the controller, and then the heating device is turned off.
2. The on-line verification method of a gas density relay according to claim 1, comprising:
According to the set verification time and/or the verification instruction and the gas density value condition or/and the temperature value condition, under the condition that the gas density relay is allowed or/and can be verified:
the contact signal sampling unit is adjusted to a checking state through the intelligent control unit, and in the checking state, the contact signal sampling unit cuts off a control loop of a contact signal of the gas density relay and connects a contact of the gas density relay body to the intelligent control unit;
The intelligent control unit is used for controlling the controller and further controlling the heating device to enable the temperature of the gas density relay to rise, and further enable the temperature of a temperature compensation element of the density relay to rise, so that the gas density relay generates contact action, the contact action is transmitted to the intelligent control unit through the contact signal sampling unit, the intelligent control unit obtains a gas density value according to a pressure value and a temperature value when the contact is acted, or directly obtains the gas density value, a contact signal action value of the gas density relay is detected, and the checking work of the contact signal action value of the gas density relay is completed;
The intelligent control unit is used for controlling the controller to control the heating device, so that the temperature of the gas density relay is reduced, the temperature of a temperature compensation element of the density relay is reduced, the contact point resetting of the gas density relay is realized, the contact point resetting is transmitted to the intelligent control unit through the contact point signal sampling unit, the intelligent control unit obtains a gas density value according to a pressure value and a temperature value when the contact point is reset, or directly obtains the gas density value, a contact point signal return value of the gas density relay is detected, and the checking work of the contact point signal return value of the gas density relay is completed;
After all contact signal check-up work is accomplished, the unit shutoff controller is controlled to the intelligence, and then the shutoff heating device to adjust to operating condition with contact signal sampling unit, the normal operating condition of operation is resumed to the control circuit of gas density relay's contact signal.
3. The on-line verification method of a gas density relay according to claim 1, further comprising: a valve;
one end of the valve is communicated with electrical equipment, the other end of the valve is communicated with the gas density relay, and the valve is connected with the intelligent control unit;
according to the set verification time and/or the verification instruction and the gas density value condition or/and the temperature value condition, under the condition that the gas density relay is allowed or/and can be verified:
The contact signal sampling unit is adjusted to a checking state through the intelligent control unit, and in the checking state, the contact signal sampling unit cuts off a control loop of a contact signal of the gas density relay and connects a contact of the gas density relay body to the intelligent control unit;
The intelligent control unit controls the controller to further control the heating device to increase the temperature of the gas density relay, and after the temperature reaches a set value, the intelligent control unit closes the valve;
when the temperature or the pressure of the gas density relay is reduced to a preset value, the intelligent control unit controls the controller to further control the heating device, so that the temperature of the gas density relay is increased, the temperature of a temperature compensation element of the density relay is increased, the gas density relay generates contact action, the contact action is transmitted to the intelligent control unit through the contact signal sampling unit, the intelligent control unit obtains a gas density value according to a pressure value and a temperature value when the contact is acted, or directly obtains the gas density value, the contact signal action value of the gas density relay is detected, and the verification work of the contact signal action value of the gas density relay is completed;
After all contact signal check-up work is accomplished, the intelligence is controlled the unit and is opened the valve to and the intelligence is controlled the unit and is shut off the controller, and then turn off the heating device.
4. the on-line verification method of a gas density relay according to claim 3, characterized in that a heating element A is further connected to the valve;
The heating element A is arranged on the gas density relay or a gas density relay mounting component and is connected with the intelligent control unit;
according to the set verification time and/or the verification instruction and the gas density value condition or/and the temperature value condition, under the condition that the gas density relay is allowed or/and can be verified:
the contact signal sampling unit is adjusted to a checking state through the intelligent control unit, and in the checking state, the contact signal sampling unit cuts off a control loop of a contact signal of the gas density relay and connects a contact of the gas density relay body to the intelligent control unit;
Controlling heating of the heating element A through an intelligent control unit to cause temperature change of gas in a gas chamber between the valve and the gas density relay, closing the valve through the intelligent control unit after a set value is reached, and then turning off the heating element A through the intelligent control unit;
After the temperature or the pressure of the air chamber is reduced to be proper, the intelligent control unit controls the controller to further control the heating device, so that the temperature of the gas density relay is increased, the temperature of a temperature compensation element of the density relay is increased, the gas density relay generates contact action, the contact action is transmitted to the intelligent control unit through the contact signal sampling unit, the intelligent control unit obtains a gas density value according to a pressure value and a temperature value when the contact is acted, or directly obtains the gas density value, the contact signal action value of the gas density relay is detected, and the verification work of the contact signal action value of the gas density relay is completed;
After all contact signal check-up work is accomplished, the intelligence is controlled the unit and is opened the valve to and the intelligence is controlled the unit and is shut off the controller, and then turn off the heating device.
5. the on-line verification method of a gas density relay according to claim 1, comprising: valve, gas chamber and heating element a;
one end of the valve is communicated with electrical equipment, the other end of the valve is communicated with the gas density relay and the gas chamber, and the valve is connected with the intelligent control unit;
the gas chamber is communicated with the gas density relay, a heating element A is arranged outside or inside the gas chamber, and the heating element A is connected with the intelligent control unit;
according to the set verification time and/or the verification instruction and the gas density value condition or/and the temperature value condition, under the condition that the gas density relay is allowed or/and can be verified:
the contact signal sampling unit is adjusted to a checking state through the intelligent control unit, and in the checking state, the contact signal sampling unit cuts off a control loop of a contact signal of the gas density relay and connects a contact of the gas density relay body to the intelligent control unit;
Heating the heating element A through an intelligent control unit to cause the temperature of the gas in the gas chamber to change, closing a valve through the intelligent control unit after a set value is reached, and then turning off the heating element A through the intelligent control unit;
After the temperature or the pressure of the air chamber is reduced to be proper, the intelligent control unit controls the controller to further control the heating device, so that the temperature of the gas density relay is increased, the temperature of a temperature compensation element of the density relay is increased, the gas density relay generates contact action, the contact action is transmitted to the intelligent control unit through the contact signal sampling unit, the intelligent control unit obtains a gas density value according to a pressure value and a temperature value when the contact is acted, or directly obtains the gas density value, the contact signal action value of the gas density relay is detected, and the verification work of the contact signal action value of the gas density relay is completed;
After all contact signal check-up work is accomplished, the intelligence is controlled the unit and is opened the valve to and the intelligence is controlled the unit and is shut off the controller, and then turn off the heating device.
6. an on-line verification method for a gas density relay according to claim 3, or 4, or 5, comprising:
After the checking work of the contact signal action value of the gas density relay is finished, the intelligent control unit controls the controller to further control the heating device, so that the temperature of the gas density relay is reduced, the temperature of a temperature compensation element of the density relay is reduced, the gas density relay is subjected to contact resetting, the contact resetting is transmitted to the intelligent control unit through the contact signal sampling unit, the intelligent control unit obtains a gas density value according to a pressure value and a temperature value when the contact is reset, or directly obtains the gas density value, a contact signal return value of the gas density relay is detected, and the checking work of the contact signal return value of the gas density relay is finished;
after all contact signal check-up work accomplished, the unit is opened the valve is controlled to the intelligence to and the unit shutoff controller is controlled to the intelligence, and then turn-offs the heating device, and adjusts operating condition with contact signal sampling unit, and gas density relay's contact signal's control circuit resumes operation normal operating condition.
7. the on-line verification method of a gas density relay as claimed in claim 1, wherein: the intelligent control unit acquires a gas density value acquired by the gas density detection sensor when the gas density relay generates contact signal action or switching, and completes the calibration of the gas density relay; alternatively, the first and second electrodes may be,
The intelligence accuse unit acquires gas density relay takes place contact signal action or when switching the pressure value and the temperature value that gas density detection sensor gathered to according to the pressure value that gas pressure-temperature characteristic conversion becomes corresponding 20 ℃, gas density value promptly, accomplish gas density relay's check-up.
8. the on-line verification method of a gas density relay as claimed in claim 1, wherein: the heating device comprises but is not limited to one of a silicon rubber heater, a resistance wire, an electrothermal alloy, an electrothermal belt, an electrothermal couple, an electrothermal rod, a hot air blower, an infrared heating device, a microwave heating device, an electromagnetic induction heating device and a semiconductor; alternatively, the first and second electrodes may be,
The heating device also comprises a heat preservation part and a shell; alternatively, the first and second electrodes may be,
The heating device also comprises a heat preservation part, an insulating part and a shell; alternatively, the first and second electrodes may be,
The heating means is arranged adjacent to the temperature compensation element.
9. the on-line verification method of a gas density relay as claimed in claim 1, wherein: the controller includes, but is not limited to, one of a temperature controller, a heating power regulator, a thermostatic controller, a temperature detector, a PID controller, a controller combining PID and fuzzy control, a variable frequency controller, and an intelligent controller.
10. the on-line verification method of a gas density relay as claimed in claim 1, wherein: the method comprises at least two heating devices, wherein one heating device is used for roughly adjusting the temperature, and the temperature of the temperature compensation element can be quickly increased to be close to a set temperature value; the other heating device is used for temperature fine adjustment and can accurately adjust the temperature of the temperature compensation element to slowly rise or fall.
11. the on-line verification method of a gas density relay as claimed in claim 1, wherein: the controller is arranged inside or outside the gas density relay body or on the shell.
12. The on-line verification method of a gas density relay as claimed in claim 1, wherein: the gas density detection sensor comprises at least one pressure sensor and at least one temperature sensor; alternatively, the first and second electrodes may be,
a gas density transmitter consisting of a pressure sensor and a temperature sensor is adopted; alternatively, the first and second electrodes may be,
a density detection sensor adopting quartz tuning fork technology.
13. the on-line verification method of a gas density relay as claimed in claim 12, wherein: the temperature sensor is arranged on the gas density relay shell, or in the vicinity of the temperature compensation element in the gas density relay shell.
14. The on-line verification method of a gas density relay as claimed in claim 13, wherein: the response speed of the temperature sensor and the gas density relay temperature compensation element to the temperature change is close to or consistent.
15. The on-line verification method of a gas density relay as claimed in claim 12, wherein: the pressure sensors include, but are not limited to, relative pressure sensors, and/or absolute pressure sensors.
16. The on-line verification method of a gas density relay as claimed in claim 1, wherein: further comprising: the pressure adjusting mechanism is communicated with the gas density relay through a gas path of the pressure adjusting mechanism during verification; the pressure regulating mechanism is configured to regulate the pressure rise and fall of the gas density relay, and then the gas density relay is matched with or/and combined with a controller and a heating device to generate contact signal action.
17. the on-line verification method of a gas density relay as claimed in claim 1, wherein: the contact signal sampling unit samples contact signals of the gas density relay, and the sampling requirements are as follows:
The contact signal sampling unit is provided with at least one group of independent sampling contacts, and at the same time, at least one contact is automatically verified, and continuous measurement is carried out without replacing the contact or reselecting the contact; wherein the content of the first and second substances,
The contacts include, but are not limited to, one of an alarm contact, an alarm contact + latching 1 contact + latching 2 contact, an alarm contact + latching contact + overpressure contact.
18. the on-line verification method of a gas density relay as claimed in claim 1, wherein: and the test data and/or the verification result are/is transmitted remotely through the communication module.
19. the on-line verification method of a gas density relay as claimed in claim 1, wherein: the control of the intelligent control unit is controlled through field control and/or background control and/or combination of field control and background control.
20. the on-line verification method of a gas density relay as claimed in claim 1, wherein: the contact resistance detection unit is also included; during checking, the contact resistance detection unit is connected with the contact point signal; the contact resistance detection unit can detect the contact resistance value of the contact of the gas density relay.
21. The on-line verification method of a gas density relay as claimed in claim 1, wherein: the online checking contact signal sampling unit is used for testing that the voltage of the contact signal action value or the switching value of the contact signal action value of the gas density relay is not lower than 24V, namely, the voltage of not lower than 24V is applied between corresponding terminals of contact signals during checking.
22. the on-line verification method of a gas density relay as claimed in claim 1, wherein: the contact signal of the gas density relay is a normally-open density relay, the online checking contact signal sampling unit comprises a first connecting circuit and a second connecting circuit, the first connecting circuit is connected with the contact signal and the contact signal control circuit of the gas density relay, and the second connecting circuit is connected with the contact signal and the intelligent control unit of the gas density relay; in a non-verification state, the second connecting circuit is disconnected or isolated, and the first connecting circuit is closed; in a checking state, the online checking contact signal sampling unit cuts off the first connecting circuit, is communicated with the second connecting circuit and connects the contact signal of the gas density relay with the intelligent control unit; alternatively, the first and second electrodes may be,
The contact signal of the gas density relay is a normally closed density relay, the online checking contact signal sampling unit comprises a first connecting circuit and a second connecting circuit, the first connecting circuit is connected with the contact signal and contact signal control loop of the gas density relay, and the second connecting circuit is connected with the contact signal and the intelligent control unit of the gas density relay; in a non-verification state, the second connecting circuit is disconnected or isolated, and the first connecting circuit is closed; under the check-up state, online check-up contact signal sampling unit is closed contact signal control circuit cuts off gas density relay's contact signal and contact signal control circuit's being connected, the intercommunication second connecting circuit will gas density relay's contact signal with the intelligence is controlled the unit and is connected.
23. the on-line verification method of a gas density relay as claimed in claim 1, wherein: through the control of the intelligent control unit, when the action value of the contact signal of the gas density relay is measured, the temperature change speed is not more than 1.0 ℃ per second when the action value is approached, namely the temperature is required to be stably increased or decreased.
24. the on-line verification method of a gas density relay as claimed in claim 1, wherein: the intelligent control unit realizes maintenance-free of the gas density relay by comparing data detected by the mutual self-calibration unit; alternatively, the first and second electrodes may be,
The detected data are compared through the intelligent control unit and the mutual self-correction unit, and maintenance-free of the gas density relay is achieved.
25. The on-line verification method of a gas density relay as claimed in claim 8, wherein: the heating device consists of a plurality of heating devices with the same or different powers; or a heating device with adjustable heating power.
26. The on-line verification method of a gas density relay of claim 25, wherein: the arrangement positions of the plurality of heating devices can be the same or different, and the heating devices can be reasonably arranged according to needs.
27. An on-line verification method of a gas density relay as claimed in claim 1 or 25, characterized in that: the temperature rise and fall mode of the controller is multi-pole control; alternatively, the first and second electrodes may be,
The temperature rising and falling mode of the controller is a gradual approximation method.
28. The on-line verification method of a gas density relay as claimed in claim 1, wherein: the intelligent control unit also comprises a depth calculation unit, and the depth calculation unit can provide an air source with proper initial density for the gas density relay to be verified according to the environmental temperature value, the gas density value or the pressure value of the electrical equipment and the gas pressure-temperature characteristic; or, the intelligence is controlled the unit according to the ambient temperature value when the check-up, the gas pressure value of electrical equipment air chamber the temperature value that gas density relay needs the check-up, according to gas pressure-temperature characteristic, for required check-up gas density relay provides the suitable air supply of initial density of a check-up.
29. the on-line verification method of a gas density relay as claimed in claim 1, wherein: the intelligent control unit acquires the gas density value acquired by the gas density detection sensor; or, the intelligence accuse unit acquires the pressure value and the temperature value that gas density detection sensor gathered accomplish the on-line monitoring of gas density relay to the electrical equipment who monitors.
30. an on-line verification method for a gas density relay as claimed in claim 29, wherein: the intelligent control unit adopts an averaging method to calculate the gas density value, and the averaging method is as follows: setting acquisition frequency in a set time interval, and carrying out average value calculation processing on N gas density values of different acquired time points to obtain the gas density values; alternatively, the first and second electrodes may be,
setting temperature interval step length in a set time interval, and carrying out average value calculation processing on N density values of different temperature values acquired in all temperature ranges to obtain gas density values; alternatively, the first and second electrodes may be,
Setting a pressure interval step length in a set time interval, and carrying out average value calculation processing on N density values of different pressure values acquired in all pressure variation ranges to obtain a gas density value;
Wherein N is a positive integer greater than or equal to 1.
31. An on-line verification method for a gas density relay as claimed in claim 30, wherein: the intelligent control unit is provided with a plurality of gas density values at different time intervals; and the gas density values of the plurality of different time intervals are uploaded to target equipment or a target platform through a communication module.
32. The on-line verification method of a gas density relay as claimed in claim 1, wherein: the intelligent control unit processes the check result in the following way: uploading the data to a background or target device in a wired or wireless mode through a communication module; alternatively, the first and second electrodes may be,
outputting a checking result signal, and uploading the checking result signal to a background or target device through an alarm signal of the gas density relay; or, in situ annunciation or alarm.
33. the on-line verification method of a gas density relay as claimed in claim 1, wherein: the intelligent control unit processes data according to whether the tested relay is an absolute pressure relay or a relative pressure relay, whether a sensor for measurement is an absolute pressure sensor or a relative pressure sensor, a temperature value during testing and a pressure-temperature characteristic relation of gas to obtain a corresponding 20 ℃ pressure value, and accurate testing of the performance of the gas density relay is realized.
34. an on-line verification method of a gas density relay as claimed in claim 1 or 33, characterized in that: the data processing content of the intelligent control unit comprises the following steps:
1) when the absolute pressure sensor is used for measuring the absolute pressure relay, directly converting the measured absolute pressure value into a corresponding absolute pressure value of 20 ℃ according to the temperature value during testing and the pressure-temperature characteristic relation of gas;
2) when a relative pressure sensor is used for measuring a relative pressure relay, directly converting the measured relative pressure value into a corresponding relative pressure value of 20 ℃ according to the temperature value during testing and the pressure-temperature characteristic relation of gas;
3) When the absolute pressure sensor is used for measuring the relative pressure relay, firstly, the measured absolute pressure value is converted into a relative pressure value, and the conversion relation is as follows: the relative pressure of the P test is the absolute pressure of the P test-P local air pressure, and then the relative pressure value of 20 ℃ is converted according to the temperature value and the pressure-temperature characteristic relation of the air during the test;
4) when the relative pressure sensor is used for measuring the absolute pressure relay, firstly, the measured relative pressure value is converted into an absolute pressure value, and the conversion relation is as follows: and the absolute pressure of the P test is equal to the relative pressure of the P test plus the local air pressure of P, and then the absolute pressure value of 20 ℃ is converted according to the temperature value and the pressure-temperature characteristic relation of the air during the test.
35. an on-line verification method of a gas density relay as claimed in claim 1 or 33, characterized in that: the data processing content of the intelligent control unit further comprises:
5) when the absolute pressure sensor is used for measuring the relative pressure relay, firstly, the measured absolute pressure value is converted into a corresponding 20 ℃ absolute pressure value according to the temperature value during testing and the pressure-temperature characteristic relation of gas, and then the corresponding 20 ℃ relative pressure value is converted, wherein the conversion relation is as follows:
the relative pressure tested at P20 is equal to the absolute pressure tested at P20-P local air pressure;
6) When the relative pressure sensor is used for measuring the absolute pressure relay, firstly, the measured relative pressure value is converted into a corresponding 20 ℃ relative pressure value according to the temperature value during testing and the pressure-temperature characteristic relation of gas, and then the corresponding 20 ℃ absolute pressure value is converted, wherein the conversion relation is as follows:
the absolute pressure of the P20 test is equal to the relative pressure of the P20 test + P local air pressure.
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