CN210604952U - Insulation resistance meter calibration system - Google Patents
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- CN210604952U CN210604952U CN201921472406.4U CN201921472406U CN210604952U CN 210604952 U CN210604952 U CN 210604952U CN 201921472406 U CN201921472406 U CN 201921472406U CN 210604952 U CN210604952 U CN 210604952U
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Abstract
The utility model relates to an insulation resistance meter calibration system, which comprises a shell, five wiring ends, a standard resistance system arranged in the shell, a L relay group, a E relay group, a voltage acquisition system and a main control system, wherein the shell is provided with five wiring ends, namely a L1 wiring end, an E1 wiring end, a L2 wiring end, an E2 wiring end and a G wiring end, the L1 wiring end and the E1 wiring end are electrically connected with the standard resistance system, the standard resistance system is electrically connected with the main control system through the L relay group and the E relay group, the L2 wiring end and the E2 wiring end are electrically connected with the voltage acquisition system, the main control system is electrically connected with the voltage acquisition system, the utility model adopts a plurality of standard resistors to form the standard resistance system for calibration, the standard resistance quantity combination and the resistance value which participate in calibration through the relay control, and utilizes the standard resistors to carry, the intelligent combination of standard resistance and relay control is flexible and convenient, and manual operation is reduced.
Description
The technical field is as follows:
the utility model belongs to the technical field of insulation resistance meter detection calibration, concretely relates to insulation resistance meter calibration system.
Background art:
with the rapid development of the electric power industry in China, preventive experiments of electrical equipment are important guarantees for safe operation and maintenance of electric power systems. Insulation diagnostics is an important means of detecting insulation defects or faults in electrical equipment. The insulation resistance meter is widely used for detecting the insulation performance of the power equipment, and the quality of the insulation resistance meter directly influences the life safety of an operator. Therefore, the verification of the insulation resistance meter is always regarded by the state and is put into the scope of compulsory verification of the measuring instrument.
At present, the verification and calibration of an insulation resistance meter (i.e. a megohmmeter) at home and abroad mainly comprises resistance calibration and voltage calibration, wherein the resistance calibration is mainly realized by adopting a standard high-voltage high-resistance box, the general method comprises the steps of connecting a measuring end of the insulation resistance meter into a resistance output end of the high-voltage high-resistance box, shaking a handle of the insulation resistance meter after adjusting the resistance value of the high-voltage high-resistance box, manually recording an indication value of the insulation resistance meter and indication values of resistance discs of the high-voltage high-resistance box, calculating an indication value error, completing one-time calibration detection, then changing the resistance value of the high-voltage high-resistance box, repeating the above operations, performing calibration and detection on the insulation resistance meter for multiple times, and finally, determining whether a verification result is qualified according to a specified verification rule of the insulation resistance meter. The voltage calibration criterion is that a voltage measuring instrument is connected with the measuring ends of the insulation resistance meter, the voltage measuring instrument detects the voltage between the two measuring ends of the insulation resistance meter, the difference between the voltage output by the insulation resistance meter and the voltage displayed by the voltage measuring instrument is the voltage error of the insulation resistance meter, and then whether the calibration result is qualified is judged according to the specified calibration rule of the insulation resistance meter.
According to the calibration mode of the insulation resistance meter, the adjustment of the resistance value of the high-voltage high-resistance standard device needs to be manually completed, the display value of the digital megohmmeter needs to be recorded by a calibrating personnel, the calculation of the indication value error needs to be calculated by the calibrating personnel, the manual operation is carried out, the error is large, the working efficiency is low, the artificial error is easy to occur, and the intelligent requirement of the instrument calibration industry on the calibrating device cannot be met.
The utility model has the following contents:
to sum up, in order to overcome the not enough of prior art problem, the utility model provides an insulation resistance meter calibration system, it adopts a plurality of standard resistance in kind to constitute the standard resistance system of calibration usefulness, participates in the standard resistance quantity combination and the resistance value of calibration through relay control, utilizes standard resistance in kind to carry out resistance calibration detection to insulation resistance meter, and the intelligent combination of resistance in kind and relay control is nimble convenient, reduces manual operation, and the commonality is strong, precision and reliability are high.
For solving the technical problem, the technical scheme of the utility model is realized like this:
an insulation resistance meter calibration system, wherein: including shell, five wiring ends and set up standard resistance system, L relay group, E relay group, voltage acquisition system and main control system in the shell, the shell on set up five wiring ends, be L1 wiring end, E1 wiring end, L2 wiring end, E2 wiring end and G wiring end respectively, L1 wiring end and E1 wiring end are connected with standard resistance system electricity, standard resistance system passes through L relay group and E relay group electricity and connects main control system, L2 wiring end and E2 wiring end be connected with voltage acquisition system electricity, voltage acquisition system electricity connect main control system, main control system include main control unit, power module, touch screen display control module, USB communication module, computer control system, insulation resistance table control module and relay control module, main control unit respectively with power module, E relay control system, Touch-sensitive screen display control module, USB communication module, relay control module and voltage acquisition system electricity are connected, USB communication module electricity connect computer control system, computer control system electricity connects insulation resistance meter control module, relay control module include L relay group control module and E relay group control module.
Further, the standard resistance system comprises a plurality of standard resistors connected in series, when the plurality of standard resistors are connected in series, the standard resistors are sequentially connected in series from small to large according to the resistance value of the standard resistors, the plurality of standard resistors connected in series are averagely divided into n resistor units, the resistance value of the standard resistor of each resistor unit is the same, the first standard resistor of the plurality of standard resistors connected in series is connected with the L relay in series and then connected to the L1 wiring terminal, the last standard resistor of the plurality of standard resistors connected in series is connected with the E relay in series and then connected with the E bus, two adjacent standard resistors of the plurality of standard resistors connected in series are connected with the E bus through outgoing lines, each outgoing line is provided with the E relay, the E bus is connected with the E1 wiring terminal, two ends of the first standard resistor of each resistor unit are connected with one standard resistor and one E relay in parallel, the parallel standard resistor is connected with the parallel E relay in series, and the resistance value of the parallel standard resistor is the same as that of the parallel standard resistor.
Further, the plurality of standard resistors connected in series of the standard resistor system are averagely divided into 8 resistor units, which are respectively a 100 Ω resistor unit, a 1k Ω resistor unit, a 10k Ω resistor unit, a 100k Ω resistor unit, a 1M Ω resistor unit, a 10M Ω resistor unit, a 100M Ω resistor unit, and a 1G Ω resistor unit, the resistance values of the plurality of standard resistors constituting the 100 Ω resistor unit are 200 Ω, the resistance values of the plurality of standard resistors constituting the 1k Ω resistor unit are 2k Ω, the resistance values of the plurality of standard resistors constituting the 10k Ω resistor unit are 20k Ω, the resistance values of the plurality of standard resistors constituting the 100k Ω resistor unit are 200k Ω, the resistance values of the plurality of standard resistors constituting the 1M Ω resistor unit are 2M Ω, the resistance values of the plurality of standard resistors constituting the 10M Ω resistor unit are 20M Ω, and the resistance values of the plurality of standard resistors constituting the 100M resistor unit are 200M Ω, the resistance values of the standard resistors forming the 1G omega resistor unit are 2G omega, and when the standard resistors are connected in series, the standard resistors of 200 omega, the standard resistors of 2k omega, the standard resistors of 20k omega, the standard resistors of 200k omega, the standard resistors of 2M omega, the standard resistors of 20M omega, the standard resistors of 200M omega and the standard resistors of 2G omega are sequentially connected in series.
Further, the resistance unit comprises five standard resistors connected in series, namely a resistor R1, a resistor R2, a resistor R3, a resistor R4 and a resistor R5 which are sequentially connected in series, two ends of the resistor R1 are connected with a resistor R6 and an E relay in parallel, the resistor R6 and the resistor R1 have the same resistance value, and the resistor R6 and the E relay are connected in series and then connected in parallel at two ends of the resistor R1.
Furthermore, the voltage acquisition system comprises a differential pressure resistor, a voltage acquisition switch circuit, a differential mode amplification circuit, a primary filter circuit, a primary amplification circuit, a secondary filter circuit, a secondary amplification circuit and an A/D conversion circuit which are electrically connected in sequence.
Further, the main controller adopts a singlechip ADUC 845.
The utility model has the advantages that:
1. the utility model discloses an adopt a plurality of standard resistance to constitute the standard resistance system of calibration usefulness, participate in the standard resistance quantity combination and the resistance value of calibration through relay control, utilize standard resistance to carry out resistance calibration detection to the insulation resistance meter, the intelligent combination of standard resistance and relay control, it is nimble convenient, reduce manual operation, the commonality is strong, precision and reliability are high.
2. The utility model discloses a resistance unit adopts six equivalence standard resistance, five equivalence standard resistance series connections, another equivalence standard resistance and series connection's first equivalence standard resistance parallel connection, six equivalence standard resistance's combination, exportable multiple standard resistance value to 100 omega resistance unit is the example, and six 200 omega's standard resistance's combination can export 100 omega ~ 1000 omega, step-by-step standard resistance value that is 100 omega. The prior art can achieve the effect by connecting 10 100 omega standard resistors in series. The utility model discloses a resistance unit compares the use amount of practicing thrift standard resistance and the use amount of relay with prior art to effectual reduce cost practices thrift the space.
4. The utility model discloses a voltage acquisition system's design, the collection precision is high, the accuracy of assurance calibration result that can be effectual.
5. The utility model discloses a standard resistance system adopts the standard resistance in kind of establishing ties to through relay control, can realize the intelligent combination of resistance in kind and relay control, it is nimble convenient, reduce corresponding manual operation and mechanical structure, improved the reliability of measurement calibration efficiency and system, and provide the possibility for remote control.
Description of the drawings:
fig. 1 is a schematic diagram of the circuit principle of the present invention;
fig. 2 is a schematic circuit diagram of the main control system of the present invention;
fig. 3 is a schematic structural diagram of the 100 Ω resistor unit and the 1k Ω resistor unit of the present invention;
FIG. 4 is a schematic diagram of the circuit principle of the voltage acquisition system of the present invention;
fig. 5 is a circuit diagram of the voltage acquisition system of the present invention;
FIG. 6 is a connection diagram of the insulation resistance meter and the present invention when the insulation resistance meter is resistance-calibrated;
figure 7 insulation resistance table and the utility model discloses a connect the wiring diagram when carrying out voltage calibration to insulation resistance table.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1 and 2, an insulation resistance meter calibration system includes a housing 1, five terminals, and a standard resistance system 2, an L relay group 9, an E relay group 11, a voltage acquisition system 8 and a main control system 10 which are disposed in the housing 1, where the housing 1 is provided with five terminals, which are an L1 terminal 4, an E1 terminal 3, an L2 terminal 6, an E2 terminal 5 and a G terminal 7, the L1 terminal 4 and the E1 terminal 3 are electrically connected to the standard resistance system 2, the standard resistance system 2 is electrically connected to the standard resistance system 10 through the L relay group 9 and the E relay group 11, the L2 terminal 6 and the E2 terminal 5 are electrically connected to the voltage acquisition main control system 8, the voltage acquisition system 8 is electrically connected to the system 10, the main control system 10 includes a main controller 101, a power module 102, and a touch screen display control module 109, USB communication module 108, computer control system 107, insulation resistance table control module 106 and relay control module 105, main control unit 101 adopt singlechip ADUC845, main control unit 101 be connected with power module 102, touch-sensitive screen display control module 109, USB communication module 108, relay control module 105 and voltage acquisition system 8 electricity respectively, USB communication module 108 electricity connect computer control system 107, computer control system 107 electricity connect insulation resistance table control module 106, relay control module 105 include L relay group control module 104 and E relay group control module 103. The relay control module 105 uses the chip ULN2003 and the USB communication module 108 uses the chip CH 431T. The touch screen display control module 109 adopts the chip ADS 7843.
The standard resistors connected in series of the standard resistor system 2 are averagely divided into 8 resistor units, namely a 100 ohm resistor unit, a 1k ohm resistor unit, a 10k ohm resistor unit, a 100k ohm resistor unit, a 1M ohm resistor unit, a 10M ohm resistor unit, a 100M ohm resistor unit and a 1G ohm resistor unit, each resistor unit comprises five standard resistors connected in series, the resistance values of the five standard resistors forming the 100 ohm resistor unit are 200 ohms, the resistance values of the five standard resistors forming the 1k ohm resistor unit are 2k ohms, the resistance values of the five standard resistors forming the 10k ohm resistor unit are 20k ohms, the resistance values of the five standard resistors forming the 100k ohm resistor unit are 200k ohms, the resistance values of the five standard resistors forming the 1M ohm resistor unit are 2M ohms, and the resistance values of the five standard resistors forming the 10M ohm resistor unit are 20M ohms, the resistance values of five standard resistors forming a 100M omega resistor unit are 200M omega, the resistance values of five standard resistors forming a 1G omega resistor unit are 2G omega, when the five standard resistors are connected in series, the five standard resistors of 200 omega, the five standard resistors of 2k omega, the five standard resistors of 20k omega, the five standard resistors of 200k omega, the five standard resistors of 2M omega, the five standard resistors of 20M omega, the five standard resistors of 200M omega and the five standard resistors of 2G omega are connected in series in sequence, 40 standard resistors are connected in series in total, the first standard resistor in the 40 standard resistors in series is connected with an L relay in series and then connected to a L1 wiring terminal, the last standard resistor in the 40 standard resistors in series is connected with an E relay in series and then connected to an E bus, and two adjacent standard resistors in the 40 standard resistors in series are connected with the E bus through outgoing lines, and each lead-out wire is provided with an E relay, the E bus is connected with the terminal of E1, two ends of the first standard resistor of each resistor unit are connected with a standard resistor and the E relay in parallel, the parallel standard resistor is connected with the parallel E relay in series, and the resistance value of the parallel standard resistor is the same as that of the parallel standard resistor. The first standard resistance is established ties with the normally open contact of L relay in the standard resistance of 40 series connections, and the coil of L relay is L relay group, and it is connected with L relay control module electricity, except first standard resistance in the standard resistance of 40 series connections, is connected with the normally open contact of E relay, and E relay group is constituteed to the coil of all E relays, and E relay group is connected with main control system's E relay control module. The relay control module 105 employs a chip ULN 2003.
As shown in fig. 3, taking the 100 Ω resistor unit and the 1k Ω resistor unit as an example, the 100 Ω resistor unit includes six labeled resistors with a resistance value of 200 Ω, which are respectively a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5 and a resistor R6. The 1K omega resistor unit comprises six labeled resistors with the resistance value of 2K omega, namely a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11 and a resistor R12. The resistance R1, the resistance R1 and the resistance R1 are sequentially connected in series, one end of the resistance R1 is connected with the L relay K1 in series and then connected with the terminal A, the terminal A is connected with the terminal 4 of the L1, the other end of the resistance R1 is connected with the resistance R1, an outgoing line between the resistance R1 and the resistance R1 is connected with the E relay K1 in series and then connected with an E bus, an outgoing line between the resistance R1 and the resistance R1 is connected with the E relay K1 in series and then connected with the E bus, an outgoing line between the resistance R1 and the resistance R1 in series are connected with the E relay K1 in series and then connected with the E bus, an outgoing line between the E relay K1 and the E bus are connected with the E relay K1 in series, and the E bus after connected with the E bus, an, an outgoing line between a resistor R8 and a resistor R9 is connected with an E relay K9 in series and then connected with an E bus, an outgoing line between a resistor R9 and a resistor R10 is connected with an E relay K10 in series and then connected with the E bus, an outgoing line between a resistor R10 and a resistor R11 is connected with an E relay K11 in series and then connected with the E bus, one end of a resistor R11 is connected with a resistor R10, the other end of the resistor R11 is connected with an E relay K12 through an outgoing line and then connected with the E bus, the E bus is connected with a terminal 3 of an E1, a resistor R6 and an E relay K7 are connected with each other in series and then connected with two ends of a resistor R1 in parallel, and a resistor R12 and an E relay.
As shown in fig. 4 and 5, the voltage acquisition system 8 includes a differential pressure resistor 81, a voltage acquisition switch circuit 82, a differential mode amplifier circuit 83, a primary filter circuit 84, a primary amplifier circuit 85, a secondary filter circuit 86, a secondary amplifier circuit 87, and an a/D converter circuit 88, which are electrically connected in sequence.
When needs examine and determine the calibration to the insulation resistance table, earlier according to the wiring method that fig. 6 is shown will treat the insulation resistance table of calibration with the utility model discloses connect, with the computer with the utility model discloses a USB communication module 108 is connected, is connected through the communication interface electricity of insulation resistance table control module with the insulation resistance table of treating the calibration. Inputting set resistance value R into computerNThe master control system 10 controls the L relay set 9 and the E relay set 11 to operate according to the set resistance value, such as the set resistance value R inputted into the computerNWhen the voltage is 100 omega, the main controller 101 controls three of the L relay K1, the E relay K2 and the E relay K7The coil of the relay is electrified, the three relays of the L relay K1, the E relay K2 and the E relay K7 are closed, the resistor R1 and the resistor R6 of the 100 omega resistor unit are connected, the resistor R1 and the resistor R6 are connected in parallel and are all 200 omega, then the standard resistor system 2 outputs the resistor R1 and the resistor R6 which are connected in parallel, the standard resistor of 100 omega is input, and the output resistor between the terminal 4 of the L1 and the terminal 3 of the E1 is 100 omega.
As another example, the set resistance value R is inputted into the computerNWhen the resistance is 200 Ω, the main controller 101 controls the coils of the two relays of the L relay K1 and the E relay K2 to be electrified, the two relays of the L relay K1 and the E relay K2 are closed, the resistor R1 of the 100 Ω resistance unit is switched on, the output resistor R1 of the standard resistance system 2 is 200 Ω standard resistor, and the output resistor between the terminal 4 of the L1 and the terminal 3 of the E1 is 200 Ω.
As another example, the set resistance value R is inputted into the computerNWhen the resistance is 300 Ω, the main controller 101 controls coils of the four relays of the L relay K1, the E relay K2, the E relay K3 and the E relay K7 to be electrified, the four relays of the L relay K1, the E relay K2, the E relay K3 and the E relay K7 are closed, the resistor R1 is connected in parallel with the resistor R6 and then connected in series with the resistor R2, a resistance value of 300 Ω is output, and the output resistance between the terminal 4 of the L1 and the terminal 3 of the E1 is 300 Ω.
As another example, the set resistance value R is inputted into the computerNWhen the resistance is 1000 Ω, the main controller 101 controls the coils of the two relays of the L relay K1 and the E relay K6 to be electrified, the two relays of the L relay K1 and the E relay K6 are closed, the resistor R1, the resistor R2, the resistor R3, the resistor R4 and the resistor R5 are connected in series, a resistance value of 1000 Ω is output, and the output resistance between the terminal 4 of the L1 and the terminal 3 of the E1 is 1000 Ω.
As another example, the set resistance value R is inputted into the computerNWhen the current is 1100 omega, the main controller 101 controls coils of the four relays of the L relay K1, the E relay K7, the E relay K8 and the E relay K13 to be electrified, the four relays of the L relay K1, the E relay K7, the E relay K8 and the E relay K13 are closed, the resistor R1, the resistor R6, the resistor R7 and the resistor R12 are connected into a circuit, and the resistor R7 is connected with the resistor R12 in parallel and then connected with the resistor R1 and the resistor R6 which are connected in parallel to obtain the currentA standard resistance output of 1100 Ω, and an output resistance between terminal 4 of L1 and terminal 3 of E1 of 1100 Ω.
As another example, the set resistance value R is inputted into the computerNWhen the current is 2K Ω, the main controller 101 controls the coils of the three relays of the L relay K1, the E relay K8 and the E relay K13 to be electrified, the three relays of the L relay K1, the E relay K8 and the E relay K13 are closed, the resistor R1, the resistor R2, the resistor R3, the resistor R4, the resistor R5, the resistor R7 and the resistor R12 are connected into a circuit, the resistor R7 is connected with the resistor R12 in parallel and then sequentially connected in series with the resistor R5, the resistor R4, the resistor R3, the resistor R2 and the resistor R1, so that an output resistance value of 2K Ω is obtained, and the output resistance between the terminal 3 of the L1 and the E1 is 2K Ω.
As another example, the set resistance value R is inputted into the computerNAt 2100 Ω, the main controller 101 controls the coils of the three relays, i.e., the L relay K1, the E relay K7, and the E relay K8, to be energized, the three relays, i.e., the L relay K1, the E relay K7, and the E relay K8, to be closed, the resistor R1, the resistor R6, and the resistor R7 are connected to the circuit, the resistor R1 is connected in parallel with the resistor R6 and then connected in series with the resistor R7, so as to obtain an output resistance value of 2100 Ω, and then the output resistance between the terminal 4 of the L1 and the terminal 3 of the E1 is 2100 Ω.
Treat the insulating ohmmeter detection of calibration the utility model discloses a resistance value between L1 wiring end 4 and E1 wiring end 3, insulating ohmmeter show that resistance value is RXAnd the display resistance value R is setXThe resistance error Δ R = R detected this time is transmitted to the computer through the main control system 10, and the computer calculatesN-RXRepeating the above process for multiple times to input different set resistance values R into the computerNAnd finally, obtaining the average value of the plurality of delta R, namely the resistance error value of the insulation ohmmeter to be calibrated. So far, the resistance calibration of the insulation resistance meter to be calibrated is completed, and the computer reads and records the display resistance value R of each verificationXSetting a resistance value RNEach time the error value Δ R is verified.
According to the wiring mode as 7 will treat the L wiring end and the E wiring end of the insulation resistance meter of calibration and the utility model discloses aL2 wiring end 6 and E2 wiring end 5 are connected, and main control unit 101 control voltage acquisition system 8's voltage acquisition switch starts, the utility model discloses the voltage value U of L2 wiring end 6 and E2 wiring end 5 that showsNAt the moment, the voltage value output by the insulation resistance meter to be calibrated is UXThe voltage representation error of the insulation resistance meter to be calibrated is △ U = UX-UN。
The computer shows the resistance value as R according to each recorded verificationXSetting a resistance value RNAnd voltage error △ U, calculating, carrying out error analysis, and judging a verification result, so far, completing verification and calibration of the insulation resistance meter to be calibrated.
It should be noted that the above-mentioned embodiments are illustrative and not restrictive of the technical solutions of the present invention, and equivalents of those skilled in the art or other modifications made according to the prior art are intended to be included within the scope of the claims of the present invention as long as they do not exceed the spirit and scope of the technical solutions of the present invention.
Claims (6)
1. An insulation resistance meter calibration system, characterized by: including shell (1), five terminals and standard resistance system (2), L relay group (9), E relay group (11), voltage acquisition system (8) and main control system (10) of setting in shell (1), shell (1) on set up five terminals, be L1 terminal (4), E1 terminal (3), L2 terminal (6), E2 terminal (5) and G terminal (7) respectively, L1 terminal (4) and E1 terminal (3) are connected with standard resistance system (2) electricity, standard resistance system (2) are through L relay group (9) and E relay group (11) electricity connection main control system (10), L2 terminal (6) and E2 terminal (5) be connected with voltage acquisition system (8) electricity, voltage acquisition system (8) electricity connection system (10), system (10) including main control unit (101), Power module (102), touch-sensitive screen display control module (109), USB communication module (108), computer control system (107), insulation resistance table control module (106) and relay control module (105), main control unit (101) be connected with power module (102), touch-sensitive screen display control module (109), USB communication module (108), relay control module (105) and voltage acquisition system (8) electricity respectively, USB communication module (108) electricity connect computer control system (107), computer control system (107) electricity connect insulation resistance table control module (106), relay control module (105) include L relay group control module (104) and E relay group control module (103).
2. The insulation resistance meter calibration system according to claim 1, wherein: the standard resistance system (2) comprises a plurality of standard resistors connected in series, the standard resistors are connected in series in sequence from small to large according to the resistance value of the standard resistors when connected in series, the standard resistors connected in series are averagely divided into n resistor units, the resistance value of the standard resistor of each resistor unit is the same, the first standard resistor of the standard resistors connected in series is connected with an L relay in series and then connected to a L1 wiring end, the last standard resistor of the standard resistors connected in series is connected with an E relay in series and then connected with an E bus, two adjacent standard resistors of the standard resistors connected in series are connected with the E bus through outgoing lines, each outgoing line is provided with the E relay, the E bus is connected with the E1 wiring end, two ends of the first standard resistor of each resistor unit are connected with the standard resistor and the E relay in parallel, the parallel standard resistor is connected with the parallel E relay in series, and the resistance value of the parallel standard resistor is the same as that of the parallel standard resistor.
3. The insulation resistance meter calibration system according to claim 2, wherein: the standard resistors connected in series of the standard resistor system (2) are averagely divided into 8 resistor units which are respectively a 100 omega resistor unit, a 1k omega resistor unit, a 10k omega resistor unit, a 100k omega resistor unit, a 1M omega resistor unit, a 10M omega resistor unit, a 100M omega resistor unit and a 1G omega resistor unit, the resistance values of the standard resistors forming the 100 omega resistor unit are 200 omega, the resistance values of the standard resistors forming the 1k omega resistor unit are 2k omega, the resistance values of the standard resistors forming the 10k omega resistor unit are 20k omega, the resistance values of the standard resistors forming the 100k omega resistor unit are 200k omega, the resistance values of the standard resistors forming the 1M omega resistor unit are 2M omega, the resistance values of the standard resistors forming the 10M omega resistor unit are 20M omega, and the resistance values of the standard resistors forming the 100M resistor unit are 200M, the resistance values of the standard resistors forming the 1G omega resistor unit are 2G omega, and when the standard resistors are connected in series, the standard resistors of 200 omega, the standard resistors of 2k omega, the standard resistors of 20k omega, the standard resistors of 200k omega, the standard resistors of 2M omega, the standard resistors of 20M omega, the standard resistors of 200M omega and the standard resistors of 2G omega are sequentially connected in series.
4. The insulation resistance meter calibration system according to claim 3, wherein: the resistance unit comprises five standard resistors connected in series, namely a resistor R1, a resistor R2, a resistor R3, a resistor R4 and a resistor R5 which are sequentially connected in series, wherein two ends of the resistor R1 are connected with a resistor R6 and an E relay in parallel, the resistor R6 is the same as the resistor R1, and the resistor R6 and the E relay are connected in series and then connected in parallel at two ends of the resistor R1.
5. The insulation resistance meter calibration system according to claim 1, wherein: the voltage acquisition system (8) comprises a differential pressure resistor (81), a voltage acquisition switch circuit (82), a differential mode amplification circuit (83), a primary filter circuit (84), a primary amplification circuit (85), a secondary filter circuit (86), a secondary amplification circuit (87) and an A/D conversion circuit (88) which are electrically connected in sequence.
6. The insulation resistance meter calibration system according to claim 1, wherein: the main controller (101) adopts a singlechip ADUC 845.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921472406.4U CN210604952U (en) | 2019-09-05 | 2019-09-05 | Insulation resistance meter calibration system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921472406.4U CN210604952U (en) | 2019-09-05 | 2019-09-05 | Insulation resistance meter calibration system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110426666A (en) * | 2019-09-05 | 2019-11-08 | 河南省计量科学研究院 | Insulation resistance meter calibration system |
| CN111693922A (en) * | 2020-08-04 | 2020-09-22 | 云南电力技术有限责任公司 | Automatic calibration system of impedance tester |
-
2019
- 2019-09-05 CN CN201921472406.4U patent/CN210604952U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110426666A (en) * | 2019-09-05 | 2019-11-08 | 河南省计量科学研究院 | Insulation resistance meter calibration system |
| CN110426666B (en) * | 2019-09-05 | 2024-04-26 | 河南省计量测试科学研究院 | Insulation resistance meter calibration system |
| CN111693922A (en) * | 2020-08-04 | 2020-09-22 | 云南电力技术有限责任公司 | Automatic calibration system of impedance tester |
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