CN112504513A - Test circuit of lubricating oil pressure and temperature combination instrument - Google Patents

Test circuit of lubricating oil pressure and temperature combination instrument Download PDF

Info

Publication number
CN112504513A
CN112504513A CN202011209877.3A CN202011209877A CN112504513A CN 112504513 A CN112504513 A CN 112504513A CN 202011209877 A CN202011209877 A CN 202011209877A CN 112504513 A CN112504513 A CN 112504513A
Authority
CN
China
Prior art keywords
temperature
test circuit
oil pressure
test
lubricating oil
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.)
Granted
Application number
CN202011209877.3A
Other languages
Chinese (zh)
Other versions
CN112504513B (en
Inventor
杨俊杰
谷雨
李存
李飞飞
王德生
徐鹏
纪书雅
姜琳
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Harbin Aircraft Industry Group Co Ltd
Original Assignee
Harbin Aircraft Industry Group Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Harbin Aircraft Industry Group Co Ltd filed Critical Harbin Aircraft Industry Group Co Ltd
Priority to CN202011209877.3A priority Critical patent/CN112504513B/en
Publication of CN112504513A publication Critical patent/CN112504513A/en
Application granted granted Critical
Publication of CN112504513B publication Critical patent/CN112504513B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K15/00—Testing or calibrating of thermometers
    • G01K15/007—Testing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L27/00—Testing or calibrating of apparatus for measuring fluid pressure
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M15/00—Testing of engines

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

The invention belongs to the technical field of electrical tests of airplanes, and discloses a test circuit of a lubricating oil pressure and temperature combination instrument, which comprises the following components: the device comprises a power supply, a pressure test circuit, a temperature test circuit and an illumination test circuit; the power supply circuit is respectively connected with the pressure test circuit, the temperature test circuit and the illumination test circuit; the pressure test circuit is used for testing the pressure gauge; the temperature test circuit is used for testing a thermometer; the lighting test circuit is used for testing the lighting circuit of the combination instrument. The invention has reasonable design, simple external connection and simple and convenient operation when a worker detects the combined instrument of the pressure and the temperature of the lubricating oil. The tester can perform comprehensive performance test on the lubricating oil pressure and temperature combination instrument, avoids direct installation of a fault product, and improves the efficiency and quality of airplane final assembly.

Description

Test circuit of lubricating oil pressure and temperature combination instrument
Technical Field
The invention belongs to the technical field of electrical tests of airplanes, and particularly relates to a test circuit of a lubricating oil pressure and temperature combination instrument.
Background
The combined instrument for pressure and temperature of lubricating oil mainly comprises a lubricating oil thermometer and a lubricating oil pressure gauge. For monitoring changes in engine oil system temperature and pressure. The combined instrument for the pressure and the temperature of the lubricating oil receives a voltage signal output by the pressure sensor of the lubricating oil and a resistance signal output by the temperature sensor of the lubricating oil, and the pressure and the temperature of the lubricating oil are indicated through an electric mechanism in the indicator.
The electrical principle of the oil pressure sensor is as follows, as shown in fig. 1:
the oil pressure sensor provides an indicator with an electrical potential that varies with the pressure provided. Any change in pressure causes the bellows to push the armature inside two stationary coils connected in series with the power supply as a variable reluctance voltage divider. The position of the armature determines the reluctance of the coil and controls the voltage supplied to the indicator.
At present, no test equipment for a lubricating oil pressure and temperature combination instrument exists.
Disclosure of Invention
The invention aims to provide a test circuit of a lubricating oil pressure and temperature combination instrument, which is used for testing various performances of the lubricating oil pressure and temperature combination instrument. Flight is guaranteed, and the failure rate of the airplane is reduced.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the lubricating oil pressure and temperature combination instrument is provided with A, B, C, D, E, F, G, H eight ports;
the end F is used for supplying power to the pressure gauge, and the end G, H is respectively used for inputting pressure signals;
the terminal B is used for supplying power to the thermometer; the C, D ends are respectively used for inputting temperature signals;
the A, E terminal is used to power the lighting circuit.
Further, the power supply circuit includes: 28V direct current voltage-stabilizing two-way power supply and 26V-400Hz alternating current power supply.
Further, the stress test circuit includes: the system comprises a proportional converter, a fuse F2, a rectifier diode D1, an alternating voltage indicator lamp DS2, an inductor L1 and a voltage regulator P1;
the pressure test circuit is also provided with a test hole 1 and a test hole 2 which are respectively connected with the anode and the cathode of the pressure signal and used for inputting the pressure signal to the pressure gauge;
the proportional converter is provided with an A end, a B end and a C end;
the A end of the proportional converter is connected with one end of a fuse F2; the other end of the fuse F2 is connected with the end F of the lubricating oil pressure and temperature combination instrument and the cathode of the rectifier diode D1, and the other end of the fuse F2 is also connected with one end of an alternating voltage indicator lamp DS 2;
the B end of the proportional converter is connected with one end of an inductor L1 through a test hole 1, and the other end of the inductor L1 is connected with a voltage regulator P1 and then connected with the G end of the lubricating oil pressure and temperature combination instrument;
the end C of the proportional converter is connected with the anode of a rectifier diode D1 through a test hole 2, is connected with the other end of an alternating voltage indicator lamp DS2 and then is connected with the end H of the lubricating oil pressure and temperature combination instrument;
and the 26V-400Hz alternating current power supply is connected with the proportional converter and used for supplying power to the proportional converter.
Further, the temperature test circuit includes: a single pole single throw switch S1, a fuse F1;
the temperature test circuit is also provided with a test hole 3 and a test hole 4 which are respectively connected with the anode and the cathode of the temperature signal and used for inputting the temperature signal for the thermometer;
the positive end of a 28V direct-current voltage-stabilizing double-circuit power supply is connected with one end of a single-pole single-throw switch S1, the other end of the single-pole single-throw switch S1 is connected with one end of a fuse F1, and the other end of the fuse F1 is connected with the B end of the lubricating oil pressure and temperature combination instrument;
the positive end of the temperature signal is connected with the C end of the lubricating oil pressure and temperature combination instrument through the test hole 3, and the negative end of the temperature signal is connected with the D end of the lubricating oil pressure and temperature combination instrument through the test hole 4.
Further, the temperature test circuit further includes: a direct current power indicator lamp DS 1; the 28V direct-current voltage-stabilizing double-circuit power supply ground is connected with one end of a direct-current power supply indicator lamp DS1, and the other end of the direct-current power supply indicator lamp DS1 is connected with the B end of the lubricating oil pressure and temperature combination instrument.
Further, the temperature test circuit further includes: a direct current voltmeter M; the direct current voltmeter M is arranged between the direct current power supply indicator lamp DS1 and the end B of the lubricating oil pressure and temperature combination instrument.
Further, the lighting test circuit includes: single-pole single-throw switch S2, test hole 5 and test hole 6; the test hole 5 and the test hole 6 are respectively connected with the positive electrode and the negative electrode of a 28V direct-current power supply to supply power for the lighting circuit;
the lighting test circuit connection relation is as follows: the positive end of a 28V direct-current voltage-stabilizing double-circuit power supply is connected with one end of a single-pole single-throw switch S2 through a test hole 5, and the other end of the single-pole single-throw switch S2 is connected with the A end of the lubricating oil pressure and temperature combination instrument; the negative end of the 28V direct-current voltage-stabilizing double-circuit power supply is connected with the E end of the lubricating oil pressure and temperature combination instrument through the test hole 6.
Further, the lighting test circuit further comprises: a direct current power indicator lamp DS 3; one end of the oil pressure temperature combination meter is connected with the A end of the lubricating oil pressure temperature combination meter, and the other end of the oil pressure temperature combination meter is connected with a power ground.
Reasonable in design, the staff when detecting lubricating oil pressure temperature combination meter, the external connection is simple, and is easy and simple to handle. The tester can perform comprehensive performance test on the lubricating oil pressure and temperature combination instrument, avoids direct installation of a fault product, and improves the efficiency and quality of airplane final assembly.
Drawings
FIG. 1 is an electrical schematic diagram of a combined oil pressure and temperature meter;
FIG. 2 is a schematic block diagram of a test circuit of a lubricating oil pressure and temperature combination instrument;
FIG. 3 is a connection diagram of a test circuit of a combined instrument for oil pressure and temperature.
Detailed Description
The technical solution of the present invention is further explained with reference to the drawings and the detailed description.
A test circuit of a lubricating oil pressure and temperature combination instrument is shown in figures 2 and 3 and comprises single-pole single-throw switches S1 and S2, direct-current power indicator lamps DS1 and DS3, an alternating-current power indicator lamp DS2, fuses F1 and F2, a direct-current voltmeter M, a voltage regulator P1, an inductor L1, a diode D1, a proportional converter and test holes 1, 2, 3, 4, 5 and 6.
The test circuit consists of 3 parts: pressure test circuit, temperature test circuit and illumination test circuit.
The stress test circuit states as follows: the AC 26V 400Hz power supply is connected with the proportional converter, the A end of the proportional converter is connected with one end of a fuse F2, and the other end of the fuse F2 is connected with the cathode of a rectifier diode D1 and one end of an AC voltage indicator lamp DS 2; the end B is connected with one end of an inductor L1 through a test hole 1, and the other end of the inductor L1 is connected with a voltage regulator P1 and then connected with the end G of the lubricating oil pressure and temperature combination instrument; and the end C is connected with the anode of a rectifier diode D1 and the other end of an alternating voltage indicator lamp DS2 through a test hole 2 and then is connected with the end H of the lubricating oil pressure and temperature combination instrument.
The temperature test circuit states as follows: the positive end of a 28V direct-current voltage-stabilizing double-circuit power supply is connected with one end of a single-pole single-throw switch S1, the other end of the single-pole single-throw switch S1 is connected with one end of a safety F1, and the other end of the safety F1 is connected with the B end of the lubricating oil pressure and temperature combination instrument. The 28V direct-current voltage-stabilizing double-circuit power ground is connected with one end of a direct-current power indicator lamp DS1, and the other end of the direct-current power indicator lamp DS1 is connected with the other end of a fuse F1 through a direct-current voltmeter M. The voltmeter is used for testing whether the direct current 28V power supply is connected into the circuit. The positive end of the temperature signal is connected with the C end of the lubricating oil pressure and temperature combination instrument through the test hole 3, and the negative end of the temperature signal is connected with the D end of the lubricating oil pressure and temperature combination instrument through the test hole 4.
The lighting test circuit states as follows: the positive end of a 28V direct-current voltage-stabilizing double-circuit power supply is connected with one end of a single-pole single-throw switch S2 through a test hole 5, the other end of the single-pole single-throw switch S2 is connected with one end of a direct-current power supply indicator lamp DS3 and the A end of the lubricating oil pressure and temperature combination instrument, and the other end of the direct-current power supply indicator lamp DS3 is connected with a power supply ground. The negative end of the 28V direct-current voltage-stabilizing double-circuit power supply is connected with the E end of the lubricating oil pressure and temperature combination instrument through the test hole 6.
The working principle is as follows:
1. performance check
(1) Performance inspection of oil thermometer
During testing, the positive end of the 28V direct-current voltage-stabilizing two-way power supply is connected with one end of a single-pole single-throw switch S1, the other end of the single-pole single-throw switch S1 is connected with one end of a safety F1, and the other end of the safety F1 is connected with the B end of the lubricating oil pressure and temperature combination instrument. The negative end of the 28V direct-current voltage-stabilizing double-circuit power supply is connected with one end of a direct-current power supply indicator lamp DS1, and the other end of the direct-current power supply indicator lamp DS1 is connected with the other end of a fuse F1 through a direct-current voltmeter M. The voltmeter is used for testing whether the direct current 28V power supply is connected into the circuit. The positive end of the temperature signal is connected with the C end of the lubricating oil pressure and temperature combination instrument through the test hole 3, and the negative end of the temperature signal is connected with the D end of the lubricating oil pressure and temperature combination instrument through the test hole 4. Referring to fig. 2, the resistance box is connected to the connection tester test holes 3 and 4, respectively, and is configured to provide a temperature signal to the lubricant thermometer, adjust the resistance value of the resistance box to make the input resistance between the test holes 3 and 4 sequentially reach the resistance value of each test point, and observe the indicated value of the lubricant thermometer. The error should satisfy the specification of table 1.
(2) Performance inspection of oil pressure gauges
During testing, the alternating current 26V 400Hz power supply is connected with the proportional converter and used for supplying power to the proportional converter; the A end of the proportional converter is connected with one end of a fuse F2, and the other end of the fuse F2 is connected with the cathode of a rectifier diode D1 and one end of an alternating voltage indicator lamp DS 2; the end B is connected with one end of an inductor L1 through a test hole 1, and the other end of the inductor L1 is connected with a voltage regulator P1 and then connected with the end G of the lubricating oil pressure and temperature combination instrument; and the end C is connected with the anode of a rectifier diode D1 and the other end of an alternating voltage indicator lamp DS2 through a test hole 2 and then is connected with the end H of the lubricating oil pressure and temperature combination instrument. Referring to fig. 2, an ac 26V 400Hz power supply is connected to input terminals COM and IN of a proportional converter, output terminals COM and OUT of the proportional converter are connected to test holes 2 and 1 connected to a tester, values between the test holes 1 and 2 are sequentially brought to test values of each test point by adjusting a nominal ratio value of the proportional converter, and an indicated value of a lube oil pressure gauge is observed. The error should satisfy the specification of table 1.
Figure BDA0002758454960000051
2. Illumination inspection
The 28V direct-current voltage-stabilizing double-circuit power switch is turned ON, the tester switch S2 is turned ON, and the illuminating lamp is lighted at the moment.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. A lubricating oil pressure temperature combination meter test circuit, the combination meter includes: a thermometer and a pressure gauge; the method is characterized in that: the test circuit includes: the device comprises a power supply circuit, a pressure test circuit, a temperature test circuit and an illumination test circuit;
the power supply circuit is respectively connected with the pressure test circuit, the temperature test circuit and the illumination test circuit;
the pressure test circuit is used for testing whether the pressure gauge works normally or not;
the temperature test circuit is used for testing whether the thermometer works normally or not;
the illumination test circuit is used for testing whether the illumination circuit of the combination instrument illuminates normally;
the lubricating oil pressure and temperature combination instrument is provided with A, B, C, D, E, F, G, H eight ports;
the end F is used for supplying power to the pressure gauge, and the end G, H is respectively used for inputting pressure signals;
the terminal B is used for supplying power to the thermometer; the C, D ends are respectively used for inputting temperature signals;
the A, E terminal is used for supplying power for the lighting circuit;
the stress test circuit includes: the system comprises a proportional converter, a fuse F2, a rectifier diode D1, an alternating voltage indicator lamp DS2, an inductor L1 and a voltage regulator P1;
the pressure test circuit is also provided with a test hole 1 and a test hole 2 which are respectively connected with the anode and the cathode of the pressure signal and used for inputting the pressure signal to the pressure gauge;
the proportional converter is provided with an A end, a B end and a C end;
the A end of the proportional converter is connected with one end of a fuse F2; the other end of the fuse F2 is connected with the end F of the lubricating oil pressure and temperature combination instrument and the cathode of the rectifier diode D1, and the other end of the fuse F2 is also connected with one end of an alternating voltage indicator lamp DS 2;
the B end of the proportional converter is connected with one end of an inductor L1 through a test hole 1, and the other end of the inductor L1 is connected with a voltage regulator P1 and then connected with the G end of the lubricating oil pressure and temperature combination instrument;
and the end C of the proportional converter is connected with the anode of a rectifier diode D1 through a test hole 2, is connected with the other end of an alternating voltage indicator lamp DS2 and then is connected with the end H of the lubricating oil pressure and temperature combination instrument.
2. The test circuit of the combined oil pressure and temperature instrument of claim 1, wherein: the power supply circuit includes: 28V direct current voltage-stabilizing two-way power supply and 26V-400Hz alternating current power supply.
3. The test circuit of the combined oil pressure and temperature instrument of claim 1, wherein: and the 26V-400Hz alternating current power supply is connected with the proportional converter and used for supplying power to the proportional converter.
4. The test circuit of the combined oil pressure and temperature instrument of claim 1, wherein: the temperature test circuit includes: a single pole single throw switch S1, a fuse F1;
the temperature test circuit is also provided with a test hole 3 and a test hole 4 which are respectively connected with the anode and the cathode of the temperature signal and used for inputting the temperature signal for the thermometer;
the positive end of a 28V direct-current voltage-stabilizing double-circuit power supply is connected with one end of a single-pole single-throw switch S1, the other end of the single-pole single-throw switch S1 is connected with one end of a fuse F1, and the other end of the fuse F1 is connected with the B end of the lubricating oil pressure and temperature combination instrument;
the positive end of the temperature signal is connected with the C end of the lubricating oil pressure and temperature combination instrument through the test hole 3, and the negative end of the temperature signal is connected with the D end of the lubricating oil pressure and temperature combination instrument through the test hole 4.
5. The test circuit of the combined oil pressure and temperature instrument of claim 4, wherein: the temperature test circuit further includes: a direct current power indicator lamp DS 1; the 28V direct-current voltage-stabilizing double-circuit power supply ground is connected with one end of a direct-current power supply indicator lamp DS1, and the other end of the direct-current power supply indicator lamp DS1 is connected with the B end of the lubricating oil pressure and temperature combination instrument.
6. The test circuit of the combined oil pressure and temperature instrument of claim 5, wherein: the temperature test circuit further includes: a direct current voltmeter M; the direct current voltmeter M is arranged between the direct current power supply indicator lamp DS1 and the end B of the lubricating oil pressure and temperature combination instrument.
7. The test circuit of the combined oil pressure and temperature instrument of claim 1, wherein: the lighting test circuit includes: single-pole single-throw switch S2, test hole 5 and test hole 6; the test hole 5 and the test hole 6 are respectively connected with the positive electrode and the negative electrode of a 28V direct-current power supply to supply power for the lighting circuit;
the lighting test circuit connection relation is as follows: the positive end of a 28V direct-current voltage-stabilizing double-circuit power supply is connected with one end of a single-pole single-throw switch S2 through a test hole 5, and the other end of the single-pole single-throw switch S2 is connected with the A end of the lubricating oil pressure and temperature combination instrument; the negative end of the 28V direct-current voltage-stabilizing double-circuit power supply is connected with the E end of the lubricating oil pressure and temperature combination instrument through the test hole 6.
8. The test circuit of the combined oil pressure and temperature instrument of claim 7, wherein: the lighting test circuit further comprises: a direct current power indicator lamp DS 3; one end of the oil pressure temperature combination meter is connected with the A end of the lubricating oil pressure temperature combination meter, and the other end of the oil pressure temperature combination meter is connected with a power ground.
CN202011209877.3A 2020-11-03 2020-11-03 Lubricating oil pressure temperature combination instrument test circuit Active CN112504513B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011209877.3A CN112504513B (en) 2020-11-03 2020-11-03 Lubricating oil pressure temperature combination instrument test circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011209877.3A CN112504513B (en) 2020-11-03 2020-11-03 Lubricating oil pressure temperature combination instrument test circuit

Publications (2)

Publication Number Publication Date
CN112504513A true CN112504513A (en) 2021-03-16
CN112504513B CN112504513B (en) 2023-07-21

Family

ID=74955282

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011209877.3A Active CN112504513B (en) 2020-11-03 2020-11-03 Lubricating oil pressure temperature combination instrument test circuit

Country Status (1)

Country Link
CN (1) CN112504513B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114858347A (en) * 2022-04-07 2022-08-05 国营芜湖机械厂 Pressure indicator indication error test equipment and test method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2995078A1 (en) * 2012-08-30 2014-03-07 Messier Bugatti Dowty PRESSURE MEASUREMENT EQUIPMENT
CN204165752U (en) * 2014-10-23 2015-02-18 哈尔滨东安发动机（集团）有限公司 Aeromotor combustion oil system test unit
CN106546381A (en) * 2015-09-18 2017-03-29 哈尔滨飞机工业集团有限责任公司 A kind of fuel pressure gauge exerciser
CN107104748A (en) * 2017-06-12 2017-08-29 成都亿动视通科技有限公司 Intelligent emergent terminal fault self-checking circuit, system and method
CN107764433A (en) * 2016-08-23 2018-03-06 哈尔滨飞机工业集团有限责任公司 A kind of Inter-Turbine Temperature watch test device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2995078A1 (en) * 2012-08-30 2014-03-07 Messier Bugatti Dowty PRESSURE MEASUREMENT EQUIPMENT
CN204165752U (en) * 2014-10-23 2015-02-18 哈尔滨东安发动机（集团）有限公司 Aeromotor combustion oil system test unit
CN106546381A (en) * 2015-09-18 2017-03-29 哈尔滨飞机工业集团有限责任公司 A kind of fuel pressure gauge exerciser
CN107764433A (en) * 2016-08-23 2018-03-06 哈尔滨飞机工业集团有限责任公司 A kind of Inter-Turbine Temperature watch test device
CN107104748A (en) * 2017-06-12 2017-08-29 成都亿动视通科技有限公司 Intelligent emergent terminal fault self-checking circuit, system and method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114858347A (en) * 2022-04-07 2022-08-05 国营芜湖机械厂 Pressure indicator indication error test equipment and test method
CN114858347B (en) * 2022-04-07 2023-10-20 国营芜湖机械厂 Pressure indicator indication error testing equipment and testing method

Also Published As

Publication number Publication date
CN112504513B (en) 2023-07-21

Similar Documents

Publication Publication Date Title
CN101477150B (en) Method for implementing fast measurement of inductive winding DC resistance by using constant voltage source
CN112504513B (en) Lubricating oil pressure temperature combination instrument test circuit
CN202210109U (en) Metering box capable of electrically replacing electric meter and current transformer
CN104332961A (en) Burning proof protection device for switch opening and closing coil
CN209821292U (en) Test tool and test system of high-voltage distribution box
CN104849656A (en) Remote intelligent test device for overall characteristics of switching equipment
CN103499970A (en) Circuit board current detector
CN100526887C (en) Electric power monitor for single phase AC electric device inspection and repair
CN111157885A (en) AC/DC universal relay checking instrument
CN203191519U (en) Device for testing alternating-current circuit breaker of aircraft
CN201307154Y (en) Comprehensive test instrument for motor
CN101419272B (en) Motor comprehensive test instrument
RU205505U1 (en) DEVICE FOR DIAGNOSTICS OF INTER-CIRCULAR FAULTS IN WINDINGS OF A THREE-PHASE TRANSFORMER
CN214405979U (en) Low-voltage alternating current-direct current loop assembled LED signal indicator lamp
CN212693923U (en) Parameter detection device for resonance eliminator
CN213423406U (en) On-load voltage regulation tapping switch test cabinet
CN111077476B (en) Method for detecting short circuit or electric leakage fault point of equipment
CN219302582U (en) Radio equipment distribution box test device
CN111323664B (en) High tension switchgear test module
CN217508291U (en) Reactive power compensation device and power distribution system
CN212180965U (en) Test module for circuit detection
CN203405683U (en) tool for controlling stability augmentation system
CN211856716U (en) Voltage indicator
CN217717965U (en) Leakage resistance detection device of direct current load circuit
RU184840U1 (en) DEVICE FOR INDICATING VOLTAGE AND REDUCING PHASES OF THREE-PHASE NETWORK

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