CN112763790B - Electrified check gauge of SF6 density relay - Google Patents
Electrified check gauge of SF6 density relay Download PDFInfo
- Publication number
- CN112763790B CN112763790B CN202011582684.2A CN202011582684A CN112763790B CN 112763790 B CN112763790 B CN 112763790B CN 202011582684 A CN202011582684 A CN 202011582684A CN 112763790 B CN112763790 B CN 112763790B
- Authority
- CN
- China
- Prior art keywords
- resistor
- action value
- pressure
- pin
- contact
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/145—Indicating the presence of current or voltage
- G01R19/155—Indicating the presence of voltage
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention discloses an SF6 density relay live-line calibrator which comprises a power supply, a control mainboard, a touch screen, a temperature sensor, an air pump, an air storage bottle, an inflation valve, an air release valve, a recovery bottle, an electromagnetic control module, a pressure sensor, an AD converter, a contact live-line acquisition module and a contact neutral-line acquisition module, wherein the control mainboard is used for controlling the temperature sensor and the air pump; the contact electrified acquisition module is used for automatically acquiring a latch 1 reset action value, a latch 2 reset action value and an alarm reset action value in an electrified way when the pressure slowly rises to finish acquiring an upstroke contact action value, and automatically acquiring an alarm action value, a latch 1 action value and a latch 2 action value in an electrified way when the pressure slowly falls to finish acquiring a downstroke contact action value; the control main board receives the upper travel contact action value pressure and the lower travel contact action value pressure, and automatically converts the contact action value pressure at the current temperature into an equivalent pressure value at 20 ℃. The invention can collect signals without electricity or with electricity, and realizes dual purposes.
Description
Technical Field
The invention relates to the technical field of SF6 gas density relay verification, in particular to an SF6 density relay live-line calibrator.
Background
At present, SF6 gas density relay checking work is mainly carried out by using two types of devices, namely a high-precision density relay checking instrument and a simple pressure gauge checking device. The following defects of the two types of existing instrument devices are found in the working process: 1. the high-precision density relay calibrator can only calibrate the density relay with the detachable or installed three-way valve and can be carried out when a secondary contact is powered off or a contact terminal is detached, and the calibrator cannot carry out live calibration, namely cannot carry out background calibration and cannot judge the function of the whole system; 2. the power of a motor air pump of the high-precision relay calibrator is low, if an SF6 density relay is provided with a long pipeline (such as an HSP sleeve), the calibrator cannot be used as a power and cannot rapidly increase or decrease the voltage; 3. the simple pressure gauge calibration device is heavy, the weight of the gauge and the pipeline reaches 10 kilograms, and a large SF6 gas cylinder needs to be equipped, so that the simple pressure gauge calibration device is very inconvenient to carry. The gas path pipe orifice is special, and the situation that the port of the check meter cannot be connected often causes difficulty in field work; 4. the simple pressure gauge calibration device needs to use a universal meter to measure the voltage between contacts by auxiliary equipment to judge the on-off of the contacts, and then the universal meter is matched with a pointer pressure gauge to read, so that the hysteresis effect appears, and the difficulty is brought to accurate reading.
At present, off-line measurement is supported by the skill of a density relay calibrator of a mainstream manufacturer, an action value can be measured only by powering off a meter, the power of an air pump is low, and calibration of the meter with large storage amount of SF6 gas is difficult to carry out; the simple calibration device cannot perform automatic temperature compensation, the precision is not enough, and the measured value cannot be directly compared with the standard requirement.
In 2018, the new edition of 'inspection test regulations for electrical equipment' stipulates that various density relays need to be subjected to functional verification. The density relays of all stations are numerous, the annual overhaul period is short, and in order to reduce the field workload and the working difficulty, the SF6 density relay electrified calibrator is urgently needed to be invented, can meet the calibration of a high-precision meter, can also be used for background calibration, can meet various calibration occasions of SF6 density relays, and ensures that the calibration precision can meet the requirements and can also be used for calibrating the functionality of the whole protection loop.
Disclosure of Invention
In view of this, in order to solve the above problems in the prior art, the invention provides an SF6 density relay live calibration instrument, a contact detection loop of which can be selected to perform detection with live and without live, and an air pump can meet the requirement of rapid voltage increase and decrease of gas inside an SF6 density relay with a long pipeline.
The invention solves the problems through the following technical means:
an SF6 density relay live check gauge, comprising:
the power supply is connected with the control main board and used for providing power for the SF6 density relay live check meter;
the control mainboard is a core control part of the density relay calibrator and is used for receiving the upper travel contact action value pressure and the lower travel contact action value pressure, automatically converting the contact action value pressure at the current temperature into an equivalent pressure value at 20 ℃ and storing the equivalent pressure value in an internal memory of the calibrator, so that a user can look up all detection data;
the touch screen is connected with the control main board and is used for finishing detection result data display and man-machine interaction touch;
the temperature sensor is connected with the control mainboard and used for measuring the current environment temperature and sending the current environment temperature to the control mainboard;
the air pump is connected with the control main board and used for recycling and pressurizing SF6 gas to the gas storage cylinder according to the control of the control main board;
the gas storage bottle is connected with the air pump, is used for storing SF6 high-pressure gas and is used for checking an air inlet and supply source for an SF6 density relay;
the inflation valve is connected with the gas storage cylinder and used for inflating SF6 high-pressure gas in the gas storage cylinder to the measurement gas chamber and boosting the pressure of the measurement gas chamber;
the measurement air chamber is connected with the inflation valve and is used for providing a working environment change place for checking the simulation density SF6 relay;
the air release valve is connected with the measuring air chamber and used for reducing the pressure of the measuring air chamber and releasing SF6 gas in the measuring air chamber to the recovery bottle;
the recovery bottle is connected with the air release valve and the air pump respectively and is a buffer air chamber for measuring the pressure reduction and air release of the air chamber, and the air in the recovery bottle can be recovered and pressurized into the air storage bottle through the air pump when needed;
the electromagnetic control module is respectively connected with the control main board, the inflation valve and the deflation valve, and controls the inflation valve and the deflation valve to be started and closed according to control signals of the control main board;
the pressure sensor is connected with the measuring gas chamber and used for completing pressure acquisition of the up-stroke contact action value when the gas pressure of the measuring gas chamber slowly rises, completing pressure of the down-stroke contact action value when the gas pressure of the measuring gas chamber slowly falls, and sending analog signals of the up-stroke contact action value pressure and the down-stroke contact action value pressure to the AD converter;
the AD converter is respectively connected with the pressure sensor and the control mainboard and is used for converting analog signals of the upper stroke contact action value pressure and the lower stroke contact action value pressure detected by the pressure sensor into digital signals and sending the digital signals to the control mainboard;
the contact electrified acquisition module is connected with the control mainboard and used for automatically acquiring a latch 1 reset action value, a latch 2 reset action value and an alarm reset action value in an electrified way when the SF6 gas pressure of the measurement gas chamber slowly rises to finish acquiring an upstroke contact action value, and automatically acquiring an alarm action value, a latch 1 action value and a latch 2 action value in an electrified way when the SF6 gas pressure of the measurement gas chamber slowly falls to finish acquiring a downstroke contact action value and sending the upstroke contact action value and the downstroke contact action value to the control mainboard;
the collection module that contacts are uncharged, with the control mainboard connection, be used for when the SF6 gas pressure of measuring the air chamber slowly rises, uncharged automatic acquisition shutting 1 action value that resets, shutting 2 action value that resets and the action value that resets of reporting to the police, accomplish and gather upstroke contact action value, when the SF6 gas pressure of measuring the air chamber slowly descends, uncharged automatic acquisition warning action value, shutting 1 action value and shutting 2 action value, accomplish and gather downstroke contact action value, and with upstroke contact action value and downstroke contact action value transmission to the control mainboard.
Furthermore, the SF6 density relay live calibrator further comprises a USB memory connected with the control mainboard and used for importing calibration data stored in the calibrator into a USB memory disk for storage.
Further, the power supply includes a charger and a lithium battery;
the charger is used for charging the lithium battery;
the lithium battery is used for providing a power supply for the SF6 density relay live check meter.
Further, the temperature sensor is a PT100 temperature sensor.
Further, the uncharged collection module of contact includes three uncharged collection circuit of contact, and the uncharged collection circuit of first contact is used for uncharged collection alarm action value and alarm reset action value, and the uncharged collection circuit of second contact is used for uncharged collection shutting 1 action value and shutting 1 reset action value, and the uncharged collection circuit of third contact is used for uncharged collection shutting 2 action value and shutting 2 reset action value.
Further, the contact electrification acquisition module comprises three contact electrification acquisition circuits, a first contact electrification acquisition circuit is used for electrified acquisition of an alarm action value and an alarm reset action value, a second contact electrification acquisition circuit is used for electrified acquisition of a locking 1 action value and a locking 1 reset action value, and a third contact electrification acquisition circuit is used for electrified acquisition of a locking 2 action value and a locking 2 reset action value.
Further, the non-electric-contact acquisition circuit comprises a chip U1, a chip U3, a terminal J1, an operational amplifier U2B, an NPN type triode Q1, a voltage stabilizing diode D3, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R8, a resistor R9, a resistor R15, a capacitor C5 and a capacitor C6;
the forward input end of the operational amplifier U2B is connected to one end of a resistor R8, one end of a resistor R4 and one end of a resistor R15 respectively, the other end of the resistor R8 is connected to the 15V end of the power supply, the other end of the resistor R4 is connected to the other end of a resistor R15 and grounded, the reverse input end of the operational amplifier U2B is connected to one end of a resistor R3 and the emitter of an NPN type triode Q1 respectively, the base of the NPN type triode Q1 is connected to one end of a resistor R1, the other end of the resistor R1 is connected to the output end of the operational amplifier U2 1, the other end of the resistor R1 is grounded, the collector of the NPN type triode Q1 is connected to one end of a pin 2 of a resistor 685j 4 and one end of a resistor R1 respectively, the other end of the resistor R1 is connected to a pin 1 of the chip U1, the pin 2 of the chip U1 is connected to one end of the resistor R1, the other end of the pin R1 is connected to a pin 3 of the chip U1, the pin 4 is connected to one end of a diode D1 and the negative electrode of a zener diode 1, the other end of the resistor R6 is connected with one end of a resistor R2 and a pin 1 of a terminal J1 respectively, the other end of the resistor R2 is connected with a power supply 24V end, a pin 6 of a chip U1 is connected with a pin 4 of a chip U3, a pin 5 of the chip U3 and one end of a capacitor C6 respectively, the other end of the capacitor C6 is connected with one end of a capacitor C5 and a pin 2 of the chip U3 respectively and is grounded, and the other end of the capacitor C5 is connected with a pin 3 of a chip U3;
the circuit also comprises an operational amplifier U2A, a voltage-regulator diode D1, a voltage-regulator diode D2, an NPN type triode Q2, a terminal J2, a terminal J3, a polar capacitor EC1, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a resistor R7, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14 and a resistor R16;
a pin 8 of the chip U1 is respectively connected with one end of a capacitor C1, one end of a resistor R11, a cathode of a zener diode D2, one end of a capacitor C3, a pin 3 of the chip U3, a positive power supply end of an operational amplifier U2A and a power supply 15V end, the other end of a resistor R11 is respectively connected with an anode of a polar capacitor EC1, a pin 1 of a terminal J3 and a power supply 24V end, a cathode of the polar capacitor EC1 is grounded, the other end of the capacitor C1 is respectively connected with an anode of a zener diode D2 and the other end of a capacitor C3 and is grounded, a pin 7 of the chip U1 is connected with one end of a resistor R7, the other end of the resistor R7 is connected with one end of a resistor R10, the other end of the resistor R10 is respectively connected with one end of a pin 5 of the chip U10, a cathode of the zener diode D10, a cathode of the operational amplifier U10 and one end of the operational amplifier U10 are respectively connected with a ground, the inverting input end of the operational amplifier U2A is connected with one end of a resistor R12, the other end of the resistor R12 is respectively connected with the output end of the operational amplifier U2A and one end of a resistor R13, the other end of the resistor R13 is respectively connected with the other end of a capacitor C4 and a pin 2 of a terminal J3, a pin 3 of the terminal J3 is grounded, one end of the resistor R16 is connected with the inverting input end of the operational amplifier U2B, the other end of the resistor R16 is respectively connected with one end of a resistor R14 and a base of an NPN type triode Q2, the other end of the resistor R14 is respectively connected with an emitter of the NPN type triode Q2 and a pin 2 of the terminal J2 and grounded, and a collector of the NPN type triode Q2 is connected with a pin 1 of a terminal J2;
two terminals of the contact are connected into a pin 1 and a pin 2 of the terminal J1 to enter an internal loop, the internal power supply voltage is 24V, and the internal power supply voltage is processed and then sent to the control main board for operation through the terminal J2 and the terminal J3.
Further, the contact electrification acquisition circuit comprises a terminal J7, a terminal PA3, a terminal DC220V/DC110V, an optical coupler U9, a diode D40, a resistor R25 and a resistor R17; a light emitter of the optocoupler U9 is a light emitting diode, and a light receiver of the optocoupler U9 is a phototriode;
two terminals of the contact are respectively connected into a pin 2 of the terminal J7 and the terminal DC220V/DC110V, and enter an internal loop; the external voltage is DC220V or DC110V, and is converted into 3.3V voltage after optical coupling isolation according to the contact voltage, and the voltage is sent to the control mainboard for operation through a terminal PA 3.
Compared with the prior art, the invention has the beneficial effects that at least:
1. the SF6 density relay can be verified electrically, namely when the SF6 density relay contact has DC220V or DC110V voltage, the SF6 density relay can be verified; there may also be no power verification, i.e., no voltage at the SF6 density relay contacts.
2. The design of piston type high-power, large-flow, vacuum pumping and air source recovery and compression integrated piston type air pump is adopted. A gas density relay with high inventory SF6 can be verified.
3. All connectors for verification are quick connection-pegs of the fly support connector, and the connectors can be plugged without disassembling bolts.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an SF6 density relay live-line calibrator;
FIG. 2 is a design drawing of a faceplate of the SF6 density relay live calibrator of the present invention;
FIG. 3 is a flow chart of the gas path control of the present invention;
FIG. 4 is a schematic diagram of the contact neutral acquisition circuit of the present invention;
fig. 5 is a schematic diagram of the contact charge collection circuit of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. It should be noted that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work based on the embodiments of the present invention belong to the protection scope of the present invention.
As shown in fig. 1, the present invention provides an SF6 density relay live calibration apparatus, including:
the power supply is connected with the control main board and used for providing power for the SF6 density relay live check meter;
the control mainboard is a core control part of the density relay calibrator and is used for receiving the upper travel contact action value pressure and the lower travel contact action value pressure, automatically converting the contact action value pressure at the current temperature into an equivalent pressure value at 20 ℃ and storing the equivalent pressure value in an internal memory of the calibrator, so that a user can look up all detection data;
the touch screen is connected with the control main board and used for finishing detection result data display and man-machine interaction touch;
the temperature sensor is connected with the control mainboard and used for measuring the current environment temperature and sending the current environment temperature to the control mainboard; specifically, the temperature sensor is a PT100 temperature sensor;
the air pump is connected with the control main board and used for recycling and pressurizing SF6 gas to the gas storage cylinder according to the control of the control main board;
the gas storage bottle is connected with the air pump, is used for storing SF6 high-pressure gas and is used for checking an air inlet and supply source for an SF6 density relay;
the inflation valve is connected with the gas storage cylinder and used for inflating SF6 high-pressure gas in the gas storage cylinder to the measurement gas chamber and boosting the pressure of the measurement gas chamber;
the measurement air chamber is connected with the inflation valve and is used for providing a working environment change place for checking the simulation density SF6 relay;
the air release valve is connected with the measuring air chamber and used for reducing the pressure of the measuring air chamber and releasing SF6 gas in the measuring air chamber to the recovery bottle;
the recovery bottle is connected with the air release valve and the air pump respectively and is a buffer air chamber for measuring the pressure reduction and air release of the air chamber, and the air in the recovery bottle can be recovered and pressurized into the air storage bottle through the air pump when needed;
the electromagnetic control module is respectively connected with the control main board, the inflation valve and the deflation valve, and controls the inflation valve and the deflation valve to be started and closed according to control signals of the control main board;
the pressure sensor is connected with the measuring gas chamber and used for completing pressure acquisition of the up-stroke contact action value when the gas pressure of the measuring gas chamber slowly rises, completing pressure of the down-stroke contact action value when the gas pressure of the measuring gas chamber slowly falls, and sending analog signals of the up-stroke contact action value pressure and the down-stroke contact action value pressure to the AD converter;
the AD converter is respectively connected with the pressure sensor and the control mainboard and is used for converting analog signals of the upper stroke contact action value pressure and the lower stroke contact action value pressure detected by the pressure sensor into digital signals and sending the digital signals to the control mainboard;
the contact electrified acquisition module is connected with the control mainboard and used for automatically acquiring a latch 1 reset action value, a latch 2 reset action value and an alarm reset action value in an electrified way when the SF6 gas pressure of the measurement gas chamber slowly rises to finish acquiring an upstroke contact action value, and automatically acquiring an alarm action value, a latch 1 action value and a latch 2 action value in an electrified way when the SF6 gas pressure of the measurement gas chamber slowly falls to finish acquiring a downstroke contact action value and sending the upstroke contact action value and the downstroke contact action value to the control mainboard;
the collection module that contacts are uncharged, be connected with the control mainboard, be used for when measuring the SF6 gas pressure of air chamber when slowly rising, uncharged automatic acquisition shutting 1 action value that resets, shutting 2 action value that resets and the alarm action value that resets, accomplish and gather upstroke contact action value, when measuring the SF6 gas pressure of air chamber slowly descends, uncharged automatic acquisition alarm action value, shutting 1 action value and shutting 2 action value, accomplish and gather downstroke contact action value, and with upstroke contact action value and downstroke contact action value transmission to the control mainboard.
Specifically, the SF6 density relay live check meter further comprises a USB memory connected with the control main board, and is used for importing the check data stored in the meter into a USB storage disk for storage.
Specifically, the power supply includes a charger and a lithium battery;
the charger is used for charging the lithium battery;
the lithium battery is used for providing a power supply for the SF6 density relay live check meter.
The working principle of the invention is as follows (as shown in fig. 2):
1. the first use of the instrument requires pre-charging with SF6Gas, the pressure of the gas storage bottle of the instrument reaches 0.9-1.0 MPa. Later when the pressure of the instrument is insufficient in the using process, the supplementary gas is prompted to be requiredTo 0.9-1.0 MPa.
2. The default of the instrument is an uncharged check density relay, when the charged check density relay is needed, a charged check button needs to be selected on an operation panel interface, and the instrument automatically enters a charged check mode after selection.
3. After the selection of the calibration is started, the instrument automatically boosts the voltage, automatically acquires a latch 1 reset action value, a latch 2 reset action value and an alarm reset action value, automatically reduces the voltage after the acquisition of the up-stroke contact action value is completed, and automatically acquires the alarm action value, the latch 1 action value and the latch 2 action value to complete the acquisition of the down-stroke contact action value; meanwhile, when the gas pressure of the measuring gas chamber slowly rises, the pressure sensor finishes the pressure acquisition of the up-stroke contact action value, when the gas pressure of the measuring gas chamber slowly falls, the pressure acquisition of the down-stroke contact action value is finished, the control main board automatically converts the contact action value pressure at the current temperature into an equivalent pressure value at 20 ℃, detection result data are displayed on the touch screen and stored in an internal memory of the instrument, and a user can look up all detection data or the detection result data are guided into a computer through a USB flash disk, and a test report is automatically generated. The report shows the density relay checking and analyzing data, and the data comprises data result qualification judgment, switching difference, contact action value error and the like.
The air path control flow chart is shown in fig. 3, and the air pump adopts a piston type high-power air pump, so that air can be quickly inflated and deflated. The gas circuit plug adopts the quick plug of the fly support gram, convenient plug.
When the instrument starts to detect, the pressure of the gas storage bottle is required to be above 0.8MPa, otherwise, the instrument can automatically start the air pump to recycle and pressurize the gas in the recycling bottle to the gas storage bottle, and if the pressure is less than 0.8MPa after recycling, the instrument can prompt air supplement information. After the calibration is started, the air release valve is closed, the charging valve is slowly opened, the gas pressure of the measuring air chamber is slowly increased, the charging valve is closed after the pressure acquisition of the upstroke contact action value is completed, the air release valve is slowly opened, the gas pressure of the measuring air chamber is slowly reduced, a calibration process is completed after the pressure acquisition of the downstroke contact action value is completed, and if the pressure of the recovery bottle reaches a set threshold value, the air pump is started to recover the gas in the recovery bottle into the gas storage bottle to prepare for the next calibration.
In order to improve the working efficiency of the SF6 density relay live-line calibrator, the piston type high-power and high-flow piston type air pump integrated with vacuumizing and air source recycling and compressing is adopted in the invention.
The piston type large-flow air pump is characterized in that: the oil-free lubrication avoids polluting the gas of the electrical equipment; the noise and vibration are low, and the working environment of detection personnel is improved; the structure is compact and the weight is light; the speed of pumping compressed gas is high, and the no-load flow reaches 15L/m.
The piston type large-flow air pump is characterized in that: the oil-free lubrication avoids polluting the gas of the electrical equipment; the noise and vibration are low, and the working environment of detection personnel is improved; the structure is compact and the weight is light; the speed of pumping compressed gas is high, and the no-load flow reaches 15L/m.
The technical parameters are as follows:
rated voltage DC 24V;
rated current Rated 6.0A;
the no-load flow Free flowing is 15L/m;
maximum pressure max. pressure 16 Bar;
maximum vacuum degree Max. vacuum-90 Kpa;
the use temperature of the Ambient temperature is 0-40 ℃;
weight of Weight Weight 1.6 Kg.
The comparison between the piston type high-flow air pump and the common flow air pump is as follows:
specifically, the uncharged collection module of contact includes three uncharged collection circuit of contact, and the uncharged collection circuit of first contact is used for uncharged collection alarm action value and alarm reset action value, and the uncharged collection circuit of second contact is used for uncharged collection shutting 1 action value and shutting 1 action value that resets, and the uncharged collection circuit of third contact is used for uncharged collection shutting 2 action value and shutting 2 action value that resets.
Specifically, the contact electrification acquisition module comprises three contact electrification acquisition circuits, wherein the first contact electrification acquisition circuit is used for electrified acquisition of an alarm action value and an alarm reset action value, the second contact electrification acquisition circuit is used for electrified acquisition of a locking 1 action value and a locking 1 reset action value, and the third contact electrification acquisition circuit is used for electrified acquisition of a locking 2 action value and a locking 2 reset action value.
The invention develops a contact electrified acquisition circuit, which can acquire signals without electricity or with electricity, thereby realizing dual purposes.
As shown in fig. 4, the non-electric-contact acquisition circuit includes a chip U1, a chip U3, a terminal J1, an operational amplifier U2B, an NPN type triode Q1, a zener diode D3, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R8, a resistor R9, a resistor R15, a capacitor C5, and a capacitor C6;
a forward input end of an operational amplifier U2B is respectively connected with one end of a resistor R8, one end of a resistor R4 and one end of a resistor R15, the other end of a resistor R8 is connected with a 15V terminal of a power supply, the other end of the resistor R4 is connected with the other end of a resistor R15 and grounded, an inverting input end of the operational amplifier U2B is respectively connected with one end of a resistor R3 and an emitter of an NPN transistor Q1, a base of the NPN transistor Q1 is connected with one end of a resistor R1, the other end of the resistor R1 is connected with an output end of the operational amplifier U2 1, the other end of the resistor R1 is grounded, a collector of the NPN transistor Q1 is respectively connected with a pin 2 of a terminal J1 and one end of a resistor R1, the other end of the resistor R1 is connected with a pin 1 of the chip U1, a pin 2 of the chip U1 is connected with one end of the resistor R1, the other end of the resistor R1 is connected with a pin 3 of the chip U1, a pin 4 of the chip U1 is respectively connected with one end of a resistor R1 and a cathode of a zener diode D1, and a pin 6855 of a pin 1 of a zener diode D1, and a pin of the chip 1 is connected with a ground, the other end of the resistor R6 is connected with one end of a resistor R2 and a pin 1 of a terminal J1 respectively, the other end of the resistor R2 is connected with a power supply 24V end, a pin 6 of a chip U1 is connected with a pin 4 of a chip U3, a pin 5 of the chip U3 and one end of a capacitor C6 respectively, the other end of the capacitor C6 is connected with one end of a capacitor C5 and a pin 2 of the chip U3 respectively and is grounded, and the other end of the capacitor C5 is connected with a pin 3 of a chip U3;
the circuit also comprises an operational amplifier U2A, a voltage-regulator diode D1, a voltage-regulator diode D2, an NPN type triode Q2, a terminal J2, a terminal J3, a polar capacitor EC1, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a resistor R7, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14 and a resistor R16;
a pin 8 of the chip U1 is respectively connected with one end of a capacitor C1, one end of a resistor R11, a cathode of a zener diode D2, one end of a capacitor C3, a pin 3 of the chip U3, a positive power supply end of an operational amplifier U2A and a power supply 15V end, the other end of a resistor R11 is respectively connected with an anode of a polar capacitor EC1, a pin 1 of a terminal J3 and a power supply 24V end, a cathode of the polar capacitor EC1 is grounded, the other end of the capacitor C1 is respectively connected with an anode of a zener diode D2 and the other end of a capacitor C3 and is grounded, a pin 7 of the chip U1 is connected with one end of a resistor R7, the other end of the resistor R7 is connected with one end of a resistor R10, the other end of the resistor R10 is respectively connected with one end of a pin 5 of the chip U10, a cathode of the zener diode D10, a cathode of the operational amplifier U10 and one end of the operational amplifier U10 are respectively connected with a ground, the inverting input end of the operational amplifier U2A is connected with one end of a resistor R12, the other end of the resistor R12 is respectively connected with the output end of the operational amplifier U2A and one end of a resistor R13, the other end of the resistor R13 is respectively connected with the other end of a capacitor C4 and a pin 2 of a terminal J3, a pin 3 of the terminal J3 is grounded, one end of the resistor R16 is connected with the inverting input end of the operational amplifier U2B, the other end of the resistor R16 is respectively connected with one end of a resistor R14 and a base of an NPN type triode Q2, the other end of the resistor R14 is respectively connected with an emitter of the NPN type triode Q2 and a pin 2 of the terminal J2 and grounded, and a collector of the NPN type triode Q2 is connected with a pin 1 of a terminal J2;
two terminals of the contact are connected into a pin 1 and a pin 2 of the terminal J1 to enter an internal loop, the internal power supply voltage is 24V, and the internal power supply voltage is processed and then sent to the control main board for operation through the terminal J2 and the terminal J3.
Two terminals of a density relay contact are input with a contact resistance conversion circuit and a contact resistance state analysis circuit, a hardware circuit conversion result is subjected to analog-to-digital conversion and sent to a control mainboard, the control mainboard obtains a contact resistance value, and contact resistance combination judgment is carried out; and judging the contact state to obtain the pressure value and the switching difference value of the contact action when the contact signal is disconnected or closed.
As shown in fig. 5, the contact electrification acquisition circuit comprises a terminal J7, a terminal PA3, a terminal DC220V/DC110V, an optical coupler U9, a diode D40, a resistor R25 and a resistor R17; a light emitter of the optocoupler U9 is a light emitting diode, and a light receiver of the optocoupler U9 is a phototriode;
two terminals of the contact are respectively connected into a pin 2 of the terminal J7 and the terminal DC220V/DC110V, and enter an internal loop; the external voltage is DC220V or DC110V, and is converted into 3.3V voltage after optical coupling isolation according to the contact voltage, and the voltage is sent to the control mainboard for operation through a terminal PA 3.
The invention carries out on-site verification on an SF6 meter with charged contacts, the voltage between the contacts is DC220V, the pressure value of an alarm node of the SF6 meter is 0.53MPa, the pressure value of a locked contact is 0.50MPa, the test result is as follows, the alarm test value (20 ℃) is 0.542MPa, the locked measured value (20 ℃) is 0.5099, and the metering requirement of 2.5 percent is met.
The SF6 gas density relay is an important part for ensuring the safe operation of SF6 electrical equipment, and the temperature characteristic and the reliability of a contact point can be changed in the operation process, so that the south network's electric equipment overhaul test code' requires regular verification. The SF6 density relay live check meter mainly develops an internal contact detection loop and an air pump device, and the contact live detection loop is added on the basis of the contact detection loop of the common SF6 density relay live check meter. The contact electrification detection circuit uses photoelectric coupling to isolate the contact voltage of the density relay from the internal circuit of the instrument, so that the secondary circuit of the contact of the density relay is protected from being grounded, and the internal circuit of the instrument is protected from being influenced by high voltage. The defects of power and flow of a common air pump are researched, the piston type high-power and high-flow piston type air pump design integrating vacuumizing and air source recycling and compressing is adopted, and the verification of a density relay with large storage amount of SF6 air can be realized.
The SF6 density relay can be electrically verified, namely when the SF6 density relay contact is provided with DC220V or DC110V voltage, the SF6 density relay can be verified; there may also be no power verification, i.e., no voltage at the SF6 density relay contacts. The checking precision can meet the requirements of regulations.
The invention adopts the design of a piston type high-power, large-flow, vacuum pumping and air source recovery and compression integrated piston type air pump, and can verify an SF6 gas density relay with a large storage amount.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (7)
1. An SF6 density relay live check meter, characterized by that includes:
the power supply is connected with the control main board and used for providing power for the SF6 density relay live check meter;
the control mainboard is a core control part of the density relay calibrator and is used for receiving the upper travel contact action value pressure and the lower travel contact action value pressure, automatically converting the contact action value pressure at the current temperature into an equivalent pressure value at 20 ℃ and storing the equivalent pressure value in an internal memory of the calibrator for a user to look up all detection data;
the touch screen is connected with the control main board and used for finishing detection result data display and man-machine interaction touch;
the temperature sensor is connected with the control main board and used for measuring the current environment temperature and sending the current environment temperature to the control main board;
the air pump is connected with the control main board and used for recovering and pressurizing SF6 gas to the gas storage bottle according to the control of the control main board;
the gas storage bottle is connected with the air pump and used for storing SF6 high-pressure gas and providing a gas source for the verification of the SF6 density relay;
the inflation valve is connected with the gas storage cylinder and used for inflating SF6 high-pressure gas in the gas storage cylinder to the measurement gas chamber and boosting the pressure of the measurement gas chamber;
the measurement air chamber is connected with the inflation valve and is used for providing a working environment change place for checking the simulation density SF6 relay;
the air release valve is connected with the measuring air chamber and used for reducing the pressure of the measuring air chamber and releasing SF6 gas in the measuring air chamber to the recovery bottle;
the recovery bottle is connected with the air release valve and the air pump respectively, is a buffer air chamber for measuring the depressurization and air release of the air chamber, and can recover and pressurize the air in the recovery bottle into the air storage bottle through the air pump;
the electromagnetic control module is respectively connected with the control main board, the inflation valve and the deflation valve, and controls the inflation valve and the deflation valve to be started and closed according to control signals of the control main board;
the pressure sensor is connected with the measuring air chamber and used for completing pressure acquisition of the up stroke contact action value when the air pressure of the measuring air chamber slowly rises, completing pressure acquisition of the down stroke contact action value when the air pressure of the measuring air chamber slowly falls, and sending analog signals of the up stroke contact action value pressure and the down stroke contact action value pressure to the AD converter;
the AD converter is respectively connected with the pressure sensor and the control mainboard and is used for converting analog signals of the upper stroke contact action value pressure and the lower stroke contact action value pressure detected by the pressure sensor into digital signals and sending the digital signals to the control mainboard;
the contact electrified acquisition module is connected with the control mainboard and used for automatically acquiring a latch 1 reset action value, a latch 2 reset action value and an alarm reset action value in an electrified manner when the SF6 gas pressure of the measurement gas chamber slowly rises to finish acquiring an upper stroke contact action value, and automatically acquiring an alarm action value, a latch 1 action value and a latch 2 action value in an electrified manner when the SF6 gas pressure of the measurement gas chamber slowly falls to finish acquiring a lower stroke contact action value and sending the upper stroke contact action value and the lower stroke contact action value to the control mainboard;
the contact neutral acquisition module is connected with the control main board and used for automatically acquiring a latch 1 reset action value, a latch 2 reset action value and an alarm reset action value when the SF6 gas pressure of the measurement gas chamber slowly rises, and completing acquisition of an up-stroke contact action value, and automatically acquiring an alarm action value, a latch 1 action value and a latch 2 action value when the SF6 gas pressure of the measurement gas chamber slowly falls, completing acquisition of a down-stroke contact action value, and sending the up-stroke contact action value and the down-stroke contact action value to the control main board;
the non-electric-contact acquisition circuit comprises a chip U1, a chip U3, a terminal J1, an operational amplifier U2B, an NPN type triode Q1, a voltage stabilizing diode D3, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R8, a resistor R9, a resistor R15, a capacitor C5 and a capacitor C6; the model of the chip U1 is INA826, and the model of the chip U3 is ADR 130;
the forward input end of the operational amplifier U2B is connected to one end of a resistor R8, one end of a resistor R4 and one end of a resistor R15 respectively, the other end of the resistor R8 is connected to the 15V end of the power supply, the other end of the resistor R4 is connected to the other end of a resistor R15 and grounded, the reverse input end of the operational amplifier U2B is connected to one end of a resistor R3 and the emitter of an NPN type triode Q1 respectively, the base of the NPN type triode Q1 is connected to one end of a resistor R1, the other end of the resistor R1 is connected to the output end of the operational amplifier U2 1, the other end of the resistor R1 is grounded, the collector of the NPN type triode Q1 is connected to one end of a pin 2 of a resistor 685j 4 and one end of a resistor R1 respectively, the other end of the resistor R1 is connected to a pin 1 of the chip U1, the pin 2 of the chip U1 is connected to one end of the resistor R1, the other end of the pin R1 is connected to a pin 3 of the chip U1, the pin 4 is connected to one end of a diode D1 and the negative electrode of a zener diode 1, the other end of the resistor R6 is connected with one end of a resistor R2 and a pin 1 of a terminal J1 respectively, the other end of the resistor R2 is connected with a power supply 24V end, a pin 6 of a chip U1 is connected with a pin 4 of a chip U3, a pin 5 of the chip U3 and one end of a capacitor C6 respectively, the other end of the capacitor C6 is connected with one end of a capacitor C5 and a pin 2 of the chip U3 respectively and is grounded, and the other end of the capacitor C5 is connected with a pin 3 of a chip U3;
the circuit also comprises an operational amplifier U2A, a voltage-regulator diode D1, a voltage-regulator diode D2, an NPN type triode Q2, a terminal J2, a terminal J3, a polar capacitor EC1, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a resistor R7, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14 and a resistor R16;
a pin 8 of the chip U1 is respectively connected with one end of a capacitor C1, one end of a resistor R11, a cathode of a zener diode D2, one end of a capacitor C3, a pin 3 of the chip U3, a positive power supply end of an operational amplifier U2A and a power supply 15V end, the other end of a resistor R11 is respectively connected with an anode of a polar capacitor EC1, a pin 1 of a terminal J3 and a power supply 24V end, a cathode of the polar capacitor EC1 is grounded, the other end of the capacitor C1 is respectively connected with an anode of a zener diode D2 and the other end of a capacitor C3 and is grounded, a pin 7 of the chip U1 is connected with one end of a resistor R7, the other end of the resistor R7 is connected with one end of a resistor R10, the other end of the resistor R10 is respectively connected with one end of a pin 5 of the chip U10, a cathode of the zener diode D10, a cathode of the operational amplifier U10 and one end of the operational amplifier U10 are respectively connected with a ground, the inverting input end of the operational amplifier U2A is connected with one end of a resistor R12, the other end of the resistor R12 is respectively connected with the output end of the operational amplifier U2A and one end of a resistor R13, the other end of the resistor R13 is respectively connected with the other end of a capacitor C4 and a pin 2 of a terminal J3, a pin 3 of the terminal J3 is grounded, one end of the resistor R16 is connected with the inverting input end of the operational amplifier U2B, the other end of the resistor R16 is respectively connected with one end of a resistor R14 and a base of an NPN type triode Q2, the other end of the resistor R14 is respectively connected with an emitter of the NPN type triode Q2 and a pin 2 of the terminal J2 and grounded, and a collector of the NPN type triode Q2 is connected with a pin 1 of a terminal J2;
two terminals of the contact are connected into a pin 1 and a pin 2 of the terminal J1 to enter an internal loop, the internal power supply voltage is 24V, and the internal power supply voltage is processed and then sent to a control main board for operation through the terminal J2 and the terminal J3.
2. The SF6 density relay live calibrator of claim 1, wherein the SF6 density relay live calibrator further comprises a USB memory connected to the control motherboard for importing the test data stored in the calibrator into the USB memory for storage.
3. The SF6 density relay live calibrator of claim 1, wherein the power supply includes a charger and a lithium battery;
the charger is used for charging the lithium battery;
the lithium battery is used for providing a power supply for the SF6 density relay live check meter.
4. The SF6 density relay hot check gauge of claim 1, wherein the temperature sensor is a PT100 temperature sensor.
5. The charged calibrator for SF6 density relays of claim 1, wherein the non-charged collection modules of contacts include three non-charged collection circuits of contacts, a first non-charged collection circuit of contacts is used for non-charged collection of alarm action values and alarm reset action values, a second non-charged collection circuit of contacts is used for non-charged collection of latch 1 action values and latch 1 reset action values, and a third non-charged collection circuit of contacts is used for non-charged collection of latch 2 action values and latch 2 reset action values.
6. The SF6 density relay live calibrator of claim 1, wherein the contact live acquisition module comprises three contact live acquisition circuits, a first contact live acquisition circuit for live acquisition of alarm action values and alarm reset action values, a second contact live acquisition circuit for live acquisition of latch 1 action values and latch 1 reset action values, and a third contact live acquisition circuit for live acquisition of latch 2 action values and latch 2 reset action values.
7. The SF6 density relay live check meter of claim 1, wherein the contact live collection circuit includes a terminal J7, a terminal PA3, a terminal DC220V/DC110V, an optocoupler U9, a diode D40, a resistor R25 and a resistor R17; a light emitter of the optocoupler U9 is a light emitting diode, and a light receiver of the optocoupler U9 is a phototriode;
pin 1 of a terminal J7 is grounded, pin 2 of a terminal J7 is connected with the cathode of a light-emitting diode, the anode of the light-emitting diode is connected with the cathode of a diode D40, the anode of the diode D40 is connected with one end of a resistor R25, the other end of the resistor R25 is connected with a terminal DC220V/DC110V, the emitter of the phototriode is grounded, the collector of the phototriode is respectively connected with one end of the resistor R17 and a terminal PA3, and the other end of the resistor R17 is connected with a power supply VCC3.3V;
two terminals of the contact are respectively connected into a pin 2 of the terminal J7 and the terminal DC220V/DC110V, and enter an internal loop; the external voltage is DC220V or DC110V, and is converted into 3.3V voltage after optical coupling isolation according to the contact voltage, and the voltage is sent to the control mainboard for operation through a terminal PA 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011582684.2A CN112763790B (en) | 2020-12-28 | 2020-12-28 | Electrified check gauge of SF6 density relay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011582684.2A CN112763790B (en) | 2020-12-28 | 2020-12-28 | Electrified check gauge of SF6 density relay |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112763790A CN112763790A (en) | 2021-05-07 |
| CN112763790B true CN112763790B (en) | 2022-06-14 |
Family
ID=75696377
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011582684.2A Active CN112763790B (en) | 2020-12-28 | 2020-12-28 | Electrified check gauge of SF6 density relay |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112763790B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114167269A (en) * | 2021-11-28 | 2022-03-11 | 厦门加华电力科技有限公司 | SF (sulfur hexafluoride)6Density relay first pressure drop checking device |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104964815A (en) * | 2015-07-01 | 2015-10-07 | 许继（厦门）智能电力设备股份有限公司 | SF6 density relay pressure contact detecting device |
| CN206975178U (en) * | 2017-08-01 | 2018-02-06 | 四川艾德瑞电气有限公司 | It is a kind of to possess on-line monitoring and the device of off-line test breaker function |
| CN108427088A (en) * | 2018-03-13 | 2018-08-21 | 中国大唐集团科学技术研究院有限公司华中分公司 | A kind of density monitor on-line testing device and on-line testing method |
| CN109031108A (en) * | 2018-07-17 | 2018-12-18 | 中国南方电网有限责任公司超高压输电公司南宁局 | A kind of auxiliary device and method for not dismantling SF6 density monitor rapid verification |
| CN109386731A (en) * | 2018-12-05 | 2019-02-26 | 河南送变电建设有限公司 | A kind of SF6 gas automatic filling system of GIS device and filling method |
| CN109444652A (en) * | 2018-11-06 | 2019-03-08 | 珠海多监测科技有限公司 | State aware ring for high-tension switch cabinet contact |
| CN209400671U (en) * | 2018-12-28 | 2019-09-17 | 广东电网有限责任公司 | Relay contact signal detection apparatus and system |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6566882B2 (en) * | 2001-06-29 | 2003-05-20 | Hubbell Incorporated | Method and apparatus for device-dependent calibration of relays for high accuracy operation at zero-crossing of input power signal |
| US6621270B2 (en) * | 2002-01-11 | 2003-09-16 | Santronics, Inc. | Method and apparatus for automated relay testing |
| US6903554B2 (en) * | 2003-07-15 | 2005-06-07 | Carrier Corporation | Control of relay opening events |
-
2020
- 2020-12-28 CN CN202011582684.2A patent/CN112763790B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104964815A (en) * | 2015-07-01 | 2015-10-07 | 许继（厦门）智能电力设备股份有限公司 | SF6 density relay pressure contact detecting device |
| CN206975178U (en) * | 2017-08-01 | 2018-02-06 | 四川艾德瑞电气有限公司 | It is a kind of to possess on-line monitoring and the device of off-line test breaker function |
| CN108427088A (en) * | 2018-03-13 | 2018-08-21 | 中国大唐集团科学技术研究院有限公司华中分公司 | A kind of density monitor on-line testing device and on-line testing method |
| CN109031108A (en) * | 2018-07-17 | 2018-12-18 | 中国南方电网有限责任公司超高压输电公司南宁局 | A kind of auxiliary device and method for not dismantling SF6 density monitor rapid verification |
| CN109444652A (en) * | 2018-11-06 | 2019-03-08 | 珠海多监测科技有限公司 | State aware ring for high-tension switch cabinet contact |
| CN109386731A (en) * | 2018-12-05 | 2019-02-26 | 河南送变电建设有限公司 | A kind of SF6 gas automatic filling system of GIS device and filling method |
| CN209400671U (en) * | 2018-12-28 | 2019-09-17 | 广东电网有限责任公司 | Relay contact signal detection apparatus and system |
Non-Patent Citations (2)
| Title |
|---|
| Study on Reliability Evaluation Technology for Isolation Switch Operation in GIS;Li Yu et al.;《2020 IEEE 4th Conference on Energy Internet and Energy System Integration (EI2)》;20201101;第3930-3934页 * |
| 基于互联网的密度继电器在线校准方法探究;周敏 等;《中国计量》;20200110(第1期);第111-112页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112763790A (en) | 2021-05-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112763790B (en) | Electrified check gauge of SF6 density relay | |
| CN102109581A (en) | Test device of power supply | |
| CN103033426B (en) | A kind of pulse detection system and method for testing | |
| CN203798898U (en) | High-voltage electriferous display locking device | |
| CN103267608A (en) | Portable pressure instrument calibrator | |
| CN203965152U (en) | A kind of portable engine combined test stand | |
| CN211653076U (en) | Relay fault detection device | |
| CN108896952A (en) | Power grid exception simulated testing system and its test method | |
| CN101625276A (en) | Detection device of engine oil pressure sensor for automobile engine and detection method thereof | |
| CN103278321A (en) | Portable electropneumatic valve positioner tester | |
| CN207380209U (en) | Portable density table contact tester | |
| CN205958706U (en) | Relay check gauge | |
| CN203455453U (en) | Oil pressure relay detection testing device | |
| CN216559040U (en) | Portable hydraulic support sensor detection system | |
| CN210323169U (en) | Portable strong magnetic electricity stealing detection device | |
| CN205919929U (en) | Hydrogen fuel vehicle hydrogen leaks combined detection sensor | |
| CN203287154U (en) | Portable pressure gauge calibrator | |
| CN110672264A (en) | Detection system and detection method for pressure sensor of micro-electro-mechanical system | |
| CN202904269U (en) | Monitoring system used in mechanical-strength positive pressure test of transformer oil tank | |
| CN208953658U (en) | A kind of mobile power source PCBA board test device | |
| CN203287034U (en) | A portable-type calibration instrument for a portable-type electrical pneumatic converter | |
| CN212255499U (en) | Integrated power distribution automation terminal signal and control test system | |
| CN217786400U (en) | Wireless dynamometer | |
| CN205002921U (en) | Gaseous leakage detector of form of a stroke or a combination of strokes superminiature | |
| CN214837054U (en) | Vacuum pump detector |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |