CN212965197U

CN212965197U - Excitation small current test device

Info

Publication number: CN212965197U
Application number: CN202021368350.0U
Authority: CN
Inventors: 叶晓峰; 刘春新; 王阳
Original assignee: Sinohydro Bureau 12 Co Ltd
Current assignee: Sinohydro Bureau 12 Co Ltd
Priority date: 2020-07-13
Filing date: 2020-07-13
Publication date: 2021-04-13
Anticipated expiration: 2030-07-13

Abstract

The utility model relates to a test device for exciting small current, which comprises a power input end; the power input end is sequentially connected with a three-phase voltage regulator, a first three-phase alternating current output air switch and a three-phase converter to form a first output module; the low-current excitation AC voltage display module is formed by sequentially connecting a fuse, a low-current change-over switch and an AC sampling meter; and the first output module is communicated with a voltage display module for exciting small current alternating current to carry out exciting small current test inspection. The utility model discloses a test device of excitation undercurrent can reliably inspect the excitation undercurrent comprehensively and can realize the light easy operation of loading and unloading again. The testing device has the advantages of small and exquisite structure, convenient wiring, convenient assembly and disassembly and simple and easy operation. The test device achieves the functions of comprehensively checking the excitation system low current test, waveform check and the like with low cost of manpower and material resources.

Description

Excitation small current test device

Technical Field

The utility model belongs to the electrical engineering field relates to a test device that is used for the excitation undercurrent of inspection substation or transformer facility.

Background

With the continuous development and improvement of electric power systems in China, the mode and the requirement of electric power construction work are continuously improved and improved. In order to check the polarity of secondary current and the correctness of relay protection in a transformer substation and other electric facilities more comprehensively and efficiently, a comprehensive final check needs to be performed on secondary circuits such as transformation ratios of all current transformers and the polarity of the secondary current in the whole substation before the single system is put into operation after the check is completed, and a primary boosting and current rising test check is generally adopted in the transformer substation with a higher voltage level at present.

The advantage of once boosting and upwelling is that the normal running state of the transformer substation is directly simulated, the test range is comprehensive, the test result is clear, and the shortcoming is that the test device is very heavy and cumbersome in wiring, and high voltage can be generated during the test and more safety measures need to be taken. The whole test process is time-consuming and inconvenient to carry, and requires high technical requirements of participators, so that the method is widely applied to substations with higher voltage levels; if a secondary current rising and voltage rising test is adopted, the defects that the current polarity and the transformation ratio cannot be checked, and the relation between the secondary current and the secondary voltage of the whole transformer substation cannot be comprehensively reflected are overcome.

Therefore, in actual work, the designed current and voltage rising test device which can comprehensively and reliably check the relation between secondary current and voltage and realize light loading and unloading and simple operation is necessary for an electrical debugging unit for meeting the requirements of different voltage grades and different plant properties.

SUMMERY OF THE UTILITY MODEL

In order to solve the above technical problems, considering the main objective of the test, in order to check the current transformation ratio, the transformation ratio of a general current transformer is several hundreds to several thousands, and the minimum current measured by the current main flow meter is generally 10mA, so that the test device is required to generate the maximum current of 50-100A; secondly, in order to check the phase sequence power of a secondary current polarity secondary voltage loop, a device which can generate homologous three-phase secondary current and voltage is needed because the secondary voltage of a current energizing source is used as a reference; and thirdly, in order to check the integrity of the output waveform of the silicon controlled rectifier, the output waveform can be checked through an oscilloscope when the excitation system of the power plant is handed over or is preventive. Therefore, the utility model provides a test device of once through-flow secondary pressurization and excitation undercurrent has three-phase pressure regulating output function concurrently, shows that electric current, voltage, power and wave form are for loading and unloading convenience integrated in two take the gyro wheel proof box, adapt to various place environment.

The utility model provides a test device for exciting small current, which comprises a power input end; the power input end is sequentially connected with a three-phase voltage regulator, a first three-phase alternating current output air switch and a three-phase converter to form a first output module; the low-current excitation AC voltage display module is formed by sequentially connecting a fuse, a low-current change-over switch and an AC sampling meter; and the first output module is communicated with a voltage display module for exciting small current alternating current to carry out exciting small current test inspection.

In some preferred embodiments, the oscilloscope probe is connected with the input end of the direct current voltmeter in parallel and then is connected with the ripple resistor to form a current display module of the excitation small current, and the current display module is connected with the direct current output of the excitation controllable silicon to perform the test check of the excitation small current.

In some preferred embodiments, the display device further comprises a direct current meter and a current divider connected in the current display module.

In some preferred embodiments, the ripple resistance includes R1, R2; the connection mode comprises: r1 is connected with R2, R1, R2 and R1 in series, R2; four resistance values are formed.

In some preferred embodiments, in the first output module, the power input end is sequentially connected with the phase sequence relay, the ac contactor and the thermal relay and then sequentially connected with the three-phase voltage regulator, the first three-phase ac output air switch and the three-phase current transformer.

In some preferred embodiments, the power input is connected to a control loop fuse, an indicator light, a start/stop button and an ac contactor to form a phase sequence check and switch control loop.

In some preferred embodiments, the single-phase alternating current air open meter power supply is further included, and the single-phase alternating current air open meter power supply is connected with the power supply input end and is respectively connected with the alternating current sampling meter, the oscilloscope, the direct current voltmeter and the direct current ammeter.

In some preferred embodiments, the air-phase open-circuit meter further comprises a first radiator connected with a power supply of the single-phase alternating-current air-phase open-circuit meter; the test device also comprises a first test box; the electrical components are located in a first test chamber.

In some preferred embodiments, the power input terminal uses a three-phase four-wire ac power source, i.e., a phase, B phase, C phase, and N phase.

Advantageous effects

The utility model discloses a test device of excitation undercurrent can reliably inspect the excitation undercurrent comprehensively and can realize the light easy operation of loading and unloading again. The testing device has the advantages of small and exquisite structure, convenient wiring, convenient assembly and disassembly and simple and easy operation. The test device achieves the functions of comprehensively checking the excitation system low current test, waveform check and the like with low cost of manpower and material resources.

Drawings

FIG. 1 is a schematic circuit diagram of a primary through-flow secondary pressurization and excitation small current testing device of the present invention;

fig. 2 is a schematic structural view of a first test chamber of the apparatus of the present invention;

figure 3 is a schematic front view of a first test chamber of the apparatus of the invention;

FIG. 4 is a schematic bottom view of a first test chamber of the apparatus of the present invention;

fig. 5 is a schematic structural view of a second test chamber of the apparatus of the present invention;

figure 6 is a schematic front view of a second test chamber of the apparatus of the invention;

fig. 7 is a schematic bottom view of a second test chamber of the apparatus of the present invention.

Reference numerals:

1. a power supply input terminal; 2. a phase sequence relay; 3. an AC contactor; 4. a thermal relay; 5. a three-phase voltage regulator; 6. the first three-phase alternating current output is idle; 7. a three-phase current transformer; 8. a current transformer; 9. a control loop fuse; 10. a yellow-green-red indicator light; 11. start and stop buttons; 12. a three-phase transformer; 13. The second three-phase alternating current output is switched on in an idle mode; 14. a single-phase alternating current air-phase open meter power supply; 15. exchanging a sampling table; 16. Inputting the voltage of the alternating current sampling meter into a fuse; 17. a transfer switch; 18. an oscilloscope; 19. a direct current voltmeter; 20. a first heat sink; 21. a direct current ammeter; 22. a direct current shunt; 23. a ripple resistance; 24. a second heat sink; 30. a first test chamber; 40. and a second test chamber.

Detailed Description

The technical solution of the present invention is further specifically described below by way of examples and with reference to the accompanying drawings.

The utility model discloses an external 380V alternating current power supply of test device of once through-flow secondary pressurization and excitation undercurrent is as this test device mains operated. Wherein, output module includes: a three-phase transformer 12 with a transformation ratio of 400V/100V and a wiring group of Y0/d11 is configured, and a secondary side is fixed to output a 100V second three-phase alternating current output air switch 13; simultaneously configuring a three-phase voltage regulator 5 with an adjustable range of 0-430V and a first three-phase alternating current output air switch 6, obtaining three-phase alternating current with adjustable output of 0-100A through a converter 7, enabling the current and fixed output voltage to be the same as a power supply, and reliably measuring active power and reactive power output during through-flow pressurization and comparing the active power and reactive power with a display value of a tested device because an included angle between the current and the fixed output voltage is fixed to be 30 degrees in a mode that a transformer is 11-point wiring. The input module includes: an oscilloscope 18 and an alternating current sampling meter 15 are configured to observe the conditions of amplitude, phase, active power, reactive power, power factors, waveform and the like of secondary voltage and current in real time; the direct current voltmeter 19, the direct current ammeter 21, the ripple resistor 23, the oscilloscope 18 and the three-phase voltage regulator 5 are also configured to be used together for the purpose of the test device under the condition of carrying out an excitation system test, the alternating current sampling meter 15, the direct current voltmeter 19 and the direct current ammeter 21 visually display various measured values, wiring does not need to be changed, and unsafe factors caused by previous complicated wiring and measurement errors are greatly reduced, so that the reliability of the test is improved. The test apparatus is provided with a phase-sequence relay 2, a thermal relay 4, a heat sink, and the like for circuit protection. The specific elemental gas symbolic representation, name and model are shown in the following table:

specifically, as shown in fig. 1: the utility model discloses an among the test device of once through-flow secondary pressurization and excitation undercurrent, power input 1 is through the phase sequence inspection: after the power input end 1 is connected with the control loop fuse 9, the yellow-green-red indicator light 10, the start/stop button 11 and the alternating current contactor 3 to form a phase sequence check and switch control loop, the phase sequence relay 2 is connected with the alternating current contactor 3, the alternating current contactor 3 is connected with the thermal relay 4, and the output of the thermal relay 4 is divided into two parts:

firstly, the method comprises the following steps: the three-phase current transformer is connected with a three-phase voltage regulator 5 and then is connected with a three-phase current transformer 7 through a first three-phase alternating current output air switch 6, a straight-through current transformer 8 is installed on the output side of the three-phase current transformer 7, and a secondary winding of the current transformer 8 is connected with an alternating current sampling meter 15; meanwhile, the first three-phase AC output air switch 6 is connected with the AC sampling meter 15 through an AC sampling meter voltage input fuse 16 and a change-over switch 17 (small current).

II, secondly: the voltage is connected with a transformer 12 which fixedly outputs 100V voltage, is output through a second three-phase alternating current output air switch 13, is connected with an alternating current sampling meter 15 through an alternating current sampling meter voltage input fuse 16 and a change-over switch 17 (voltage is on).

In addition, the power input end 1 is connected with a control loop fuse 9, supplies power to an alternating current control loop for phase sequence checking and switching and a yellow green red indicator light 10 display loop, and controls the on/off of the alternating current contactor 3 through an 11 start/stop button.

The single-phase alternating current air-phase open meter power supply 14 is a power supply of a meter, a radiator and the like, and is sequentially connected with an alternating current sampling meter 15, an oscilloscope 18, a direct current voltmeter 19, a direct current ammeter 21, a first radiator 20 and a second radiator 24 working power supply.

The probe of the oscilloscope 18 is connected with the sampling end of the direct current voltmeter 19 in parallel, wherein the probe of the oscilloscope is not fixed and can be changed to be measured according to the requirement, and the anode of the sampling end of the direct current voltmeter 19 is connected with the direct current shunt 22 and then connected with the ripple resistor 23.

The input of the AC 380V power supply adopts a three-phase four-wire system AC power supply, namely an A phase, a B phase, a C phase and an N phase.

The grounding mark is the grounding of the shells of a box body of the test device, a three-phase voltage regulator, a three-phase converter, a three-phase transformer and the like, wherein the test device has primary through-flow secondary pressurization and small excitation current.

2-7, the test apparatus is divided into two test chambers, wherein the three-phase current transformer 7, the current transformer 8, the second heat sink 24 are installed in the second test chamber 40, and the rest of the electrical components are installed in the first test chamber 30; the first and

second radiators

20 and 24 radiate heat to the first and

second test chambers

30 and 40, respectively, to achieve stable operation of the first and

second test chambers

30 and 40. The electric elements in the two test boxes are compact and reasonable in layout, and the display interface is clear. In some embodiments, the bottom of each test box is provided with universal wheels, and handles are arranged on two sides of the box body to facilitate loading, unloading and moving.

The utility model discloses a test device of once through-flow secondary pressurization and excitation undercurrent's specific test circuit flow does:

the correctness of a phase sequence is judged by a phase sequence relay 2 after a three-phase 380V power input passes through a power input end 1, a yellow indicator lamp in a yellow-green-red indicator lamp 10 is turned on if the phase sequence is correct, a starting button 11 is switched on to enable an alternating current contactor 3 to attract an auxiliary contact to be self-maintained, the green indicator lamp in the yellow-green-red indicator lamp 10 is turned on, and a stop button is switched on or a thermal relay acts to turn on a red indicator lamp in the yellow-green-red indicator lamp 10 so as not to output alternating current. The alternating current contactor 3, the thermal relay 4, the three-phase voltage regulator 5, the first three-phase alternating current output air switch 6 and the three-phase current transformer 7 are connected to output 0-100A adjustable current to an equipment loop needing through-flow inspection; the output side of the three-phase current transformer 7 is fed back to the alternating current sampling table 15 through the current transformer 8 with the transformation ratio of 200/5A. The thermal relay 4 is also connected with a three-phase transformer 12 (fixed output 100V), is connected to an equipment loop needing secondary pressurization through a second three-phase alternating current output air switch 13, and the output voltage is fed back to an alternating current sampling table 15 through an alternating current sampling table voltage input fuse 16 and a change-over switch 17 (on voltage) and displays test parameters such as a primary through-current secondary pressurization voltage value, a current value, power and the like with a current transformer 8 through the alternating current sampling table 15.

In the excitation small current test, the connection with the second test box 40 is disconnected, and only the first test box 30 is used; the same as the test of primary through-flow secondary pressurization, after phase sequence inspection, the three-phase voltage regulator 5 is supplied with power through the alternating current contactor 3 and the thermal relay 4, and then the power is led out to the input ends of an excitation alternating current input, an excitation PT sampling, an excitation synchronous transformer and the like in the excitation cabinet through the first three-phase alternating current output air switch 6. The output voltage is fed back to the AC sampling meter 15 through the voltage input fuse 16 and the change-over switch 17 (small current) of the AC sampling meter to display the output voltage value of the three-phase adjustable voltage; the probe of the oscilloscope 18 is connected with the input end of the direct current voltmeter 19 in parallel and is connected to the direct current output side of the excitation controllable silicon. The ripple resistor 23 replaces a generator rotor, the ripple resistor 23 comprises two resistors R1 and R2, the resistors R1 and R2 can change four resistance values of 16.6 omega (1 anode, 3 and 6 connection, 4, 5 and 2 connection are cathodes), 25 omega (1 anode, 2 and 4 connection cathodes), 50 omega (1 anode, 3 and 5 connection, 2 and 6 connection are cathodes), 75 omega (1 anode, 4 and 5 connection, 2 and 6 connection are cathodes) through a series-parallel connection mode, and the requirements of non-excitation equipment are met. The direct current shunt 22 is connected to the direct current ammeter 21 by adopting 10A/75mV, and a change curve for controlling the conduction angle of the controllable silicon can be drawn by combining the display values of the direct current ammeter 21, the direct current voltmeter 19 and the oscilloscope 18.

The above only is the embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structures or equivalent processes of the present invention are used in the specification and the attached drawings, or directly or indirectly applied to other related technical fields, and the same principle is included in the protection scope of the present invention.

Claims

1. Excitation undercurrent's test device, its characterized in that: comprises a power input end; the power input end is sequentially connected with a three-phase voltage regulator, a first three-phase alternating current output air switch and a three-phase converter to form a first output module; the low-current excitation AC voltage display module is formed by sequentially connecting a fuse, a low-current change-over switch and an AC sampling meter; and the first output module is communicated with the excitation low-current alternating voltage display module and is used for carrying out excitation low-current test inspection.

2. The excitation small-current test device according to claim 1, characterized in that: the oscilloscope probe is connected with the input end of the direct current voltmeter in parallel and then connected with the ripple resistor to form a current display module of small excitation current, and the current display module is connected with the direct current output of the excitation controllable silicon to carry out small excitation current test and check.

3. The excitation small-current test device according to claim 2, characterized in that: the display device also comprises a direct current meter and a current divider which are connected in the current display module.

4. The excitation small-current test device according to claim 2, characterized in that: the ripple resistor comprises R1 and R2; the connection mode comprises: r1 is connected with R2, R1, R2 and R1 in series, R2; four resistance values are formed.

5. The excitation small-current test device according to claim 3, characterized in that: in the first output module, a power input end is sequentially connected with a phase sequence relay, an alternating current contactor and a thermal relay and then sequentially connected with a three-phase voltage regulator, a first three-phase alternating current output air switch and a three-phase current transformer.

6. The excitation small-current test device according to claim 5, characterized in that: the power input end is connected with a control circuit fuse, a yellow-green-red indicator light, a start/stop button and an alternating current contactor to form a phase sequence checking and switch control circuit.

7. The excitation small-current test device according to claim 6, characterized in that: the single-phase alternating current air open meter power supply is connected with the power supply input end and is simultaneously connected with the alternating current sampling meter, the oscilloscope, the direct current voltmeter and the direct current ammeter respectively.

8. The excitation small-current test device according to claim 7, characterized in that: the first radiator is connected with a power supply of the single-phase alternating-current air-phase open meter; the test device also comprises a first test box; the electrical components are located in a first test chamber.

9. The excitation small-current test device according to claim 1, characterized in that: the input end of the power supply adopts a three-phase four-wire system alternating current power supply, namely an A phase, a B phase, a C phase and an N phase.