CN211014609U

CN211014609U - Detection apparatus for contactor front end fuse

Info

Publication number: CN211014609U
Application number: CN201921391958.2U
Authority: CN
Inventors: 刘佳伟; 王振威; 张宗魁
Original assignee: Gu'an Huadian Tianren Control Equipment Co ltd; Beijing Huadian Tianren Power Controlling Technology Co Ltd
Current assignee: Guoneng Information Technology Hebei Co ltd; Guoneng Xinkong Internet Technology Co Ltd
Priority date: 2019-08-26
Filing date: 2019-08-26
Publication date: 2020-07-14
Anticipated expiration: 2029-08-26

Abstract

The utility model provides a detection device of contactor front end fuse, includes rectifier, voltage regulator, P L C, a plurality of bus terminal module, relay, the output of rectifier is connected to P L C's input, P L C sets up first to fourth bus terminal module, the input of voltage regulator is connected to the 220Vac power, output phase line series connection in proper order normally open contact, the fuse of relay and third bus terminal module, the first contact of relay is connected to second bus terminal module, the second contact is connected to the output negative pole of rectifier, AC contactor's first contact is connected to third bus terminal module, AC contactor's third contact is connected to the output positive pole of rectifier, AC contactor's fourth contact is connected to third bus terminal module.

Description

Detection apparatus for contactor front end fuse

Technical Field

The utility model belongs to the technical field of wind generating set becomes oar control system, especially, relate to a detection device of contactor front end fuse.

Background

With the development of the variable pitch control system of the wind driven generator, a large megawatt variable pitch system is more and more put into the market. In a large megawatt variable pitch system, a contactor is frequently applied to the front end of a system power supply circuit to play a role in connecting and segmenting lines.

The contactor is an electric appliance which utilizes a coil to flow current to generate a magnetic field in industrial electricity to close a contact so as to control a load. The main contactors are classified into an alternating current contactor (voltage AC) and a direct current contactor (voltage DC), and are applied to electric power, distribution, and utilization.

An alternating current contactor adopted in the field of wind power variable pitch systems is mainly responsible for switching on and switching off 400V alternating current, a contactor coil is powered by one phase line and a zero line, the normal rated working voltage is 220Vac, and the voltage range is 0.8-1.1 times of the rated voltage. When the power grid is abnormal or wrong in wiring, the condition that the contactor coil has low voltage or overvoltage can be caused, and the contactor coil can be burnt due to overlong duration. If the fuse is additionally arranged at the front end of the coil of the contactor, the function of protecting the coil can be achieved. The types of alternating current contactors used by different variable-pitch propeller models are different, when the types of fuses are selected, a general method is to use a current clamp meter to test phase line current, a stopwatch records fuse fusing time, and a coil of the idle-on disconnecting contactor is powered on or powered off. However, the existing detection method has low efficiency, large errors exist in measuring phase current and fusing time, and the safety type selection cannot be accurately made.

SUMMERY OF THE UTILITY MODEL

The utility model provides a detection apparatus for contactor front end fuse, this detection apparatus can accurately test whether the fuse can play the effect of protection contactor coil.

The utility model discloses specifically adopt following technical scheme:

the detection device for the front-end fuse of the contactor comprises a rectifier, a voltage regulator, a P L C, a plurality of bus terminal modules and a relay, and is characterized in that:

the input end of the rectifier is connected to a 220Vac power supply, and the output end of the rectifier is connected to the input end of P L C;

the P L C is provided with the plurality of bus terminal modules, which include a first bus terminal module, a second bus terminal module, a third bus terminal module and a fourth bus terminal module;

the input end of the voltage regulator is connected to a 220Vac power supply, the output end phase line of the voltage regulator is sequentially connected in series with the normally open contact of the relay, the fuse and the third bus terminal module,

the zero line of the output end of the voltage regulator is connected to a second contact of the alternating current contactor;

a first contact of the relay is connected to the second bus terminal module, and a second contact of the relay is connected to the output cathode of the rectifier;

the first contact of the alternating current contactor is connected to the third bus terminal module, the third contact of the alternating current contactor is connected to the output anode of the rectifier, and the fourth contact of the alternating current contactor is connected to the third bus terminal module.

Further, the P L C is doublefu BX 3100.

Further, the first bus terminal module, the second bus terminal module, the third bus terminal module and the fourth bus terminal module are respectively a double-Fu K L1408, a K L2408, a K L3403 and a K L9010 type bus terminal module.

Writing test logic in the P L C, editing a visual interface, including start, reset and cycle test buttons on the interface, and displaying the pull-in time of the third contact L2 and the fourth contact T2 of the ac contactor, the phase line current value (i.e. the current value flowing through the fuse) of the voltage regulator, and the pull-in and disconnection times of the third contact L2 and the fourth contact T2 of the ac contactor.

When the terminal 1 of the K L1408 is detected to have high level input, the internal logic of the P L C controls the terminal 1 of the K L2408 to output high level, so that the relay 8 is controlled to be powered on.

The K L3403 type bus terminal module is a measuring card, the function of the card is to measure the current value, the precision is 1mA, and compared with the 10mA precision of the traditional clamp flow meter, the card can greatly improve the measurement accuracy.

The third contact L and the fourth contact T2 of the alternating current contactor are connected in series to the output anode of the rectifier, the closing and opening of the contacts of the alternating current contactor can control the high level input of the No. 1 terminal of the K L1408, when the system is started in a normal state, the normally open contact 9 of the relay 8 is closed, the third contact L2 of the alternating current contactor is closed with the fourth contact T2, and the No. 1 terminal of the K L1408 has the high level input.

The utility model discloses following beneficial effect has:

1. the detection device is simple to operate, the test can be completed only by controlling the start button and the reset button, and manpower and material resources can be saved;

2. the measurement precision is greatly improved, so that the fuse selection is more reliable;

3. the test data is visually displayed in a visual interface, and reading and recording are more convenient;

4. in the long-time aging test, the total test time is recorded by P L C after the fuse is blown, and the manual monitoring can be completely separated.

Drawings

Fig. 1 is a schematic view of the installation structure of the present invention.

FIG. 2 is a visual interface view of the BX3100P L C controller.

In the drawings: the reference signs are:

1 is a rectifier;

2 is a voltage regulator;

3 is a BX3100P L C controller;

the 4 is a K L1408 type bus terminal module;

5 is a K L2408 bus terminal module;

6 is a K L3403 type bus terminal module;

7 is a K L9010 type bus terminal module;

8 is a relay;

9 is a normally open contact of the relay;

10 is a fuse;

and 11 is an alternating current contactor.

Detailed Description

The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

The utility model discloses a detection device of contactor front end fuse, the mounting means is as shown In FIG. 1. rectifier 1's input positive negative pole connects respectively on live wire, the zero line of 220Vac power, rectifier 1 output 24Vdc, output positive negative pole is connected to BX3100P L C3's power supply terminal, open rectifier 1, P L C3 gets the electricity to start, voltage regulator 2's input positive negative pole connects respectively on live wire, the zero line of 220Vac power, after the pressure regulating, the output range is 0-250Vac, wherein the phase line is established ties into relay 8's normally open contact 9 (In FIG. 1, reference numeral 9 represents relay 8's normally open contact), establish ties into the fuse 10 under test, connect last I L terminal of K L03403 type bus terminal module 6, K L type 3403 bus terminal module 6's In terminal is connected to AC contactor 11's first contact A7, the zero line direct connection is to AC contactor 11's second contact A2. K L1408 type terminal module 4, K L type bus terminal module 6855, K3403 type bus terminal is connected to AC contactor module # 2408A # 1A # of AC contactor, the rectifier module # 1A # output terminal of the rectifier module # 2408, the rectifier # rectifier module # 1 is connected to the output of the third contact of the AC contactor # 829 of the AC contactor # 18A # module # 1A # 1, the AC contactor # rectifier # straight connection of the AC contactor # module # 9 is connected to the AC contactor # 9 of the AC contactor # straight connection of the AC contactor # 9 #.

The method comprises the steps of connecting a tested fuse into a system, entering a detection stage, operating a visual interface of BX3100P L C3 as shown in figure 2, clicking a 'start' button, outputting a 24V high level by a terminal 1 of a K L2408 type bus terminal module 5, electrifying a relay 8, closing a normally open contact 9 of the relay, electrifying a coil of an alternating current contactor 11, attracting a contact, namely attracting L and T2, feeding an output anode of a rectifier 1 to the terminal 1 of a K1408 type bus terminal module 4 through 862 and T2 contacts of the alternating current contactor 11, starting timing after the P L C3 detects the high level, wherein the recorded time is attraction time of the alternating current contactor 11, recording a real-time current value (namely a current value flowing through the fuse) output by a phase line 2 (namely a current value) shown in figure 2, wherein the unit is '5635 mA', refreshing is carried out for 20ms, and after the tested fuse is refreshed, the output of a voltage regulator 2 is disconnected, the coil of the alternating current contactor 11 is lost, an elastic contact is opened, a terminal L is also opened, and the bus terminal 3 does not receive the high level after the timing is not detected by the P3526.

The method comprises the steps of conducting power-on impact test on a fuse to be tested, operating a visual interface of BX3100P L C3 as shown in FIG. 2, clicking a 'loop _ text' button, enabling a P L C3 to control a terminal 1 of a K L2408 type bus terminal module 5 to periodically output a 24V high level, namely controlling a contact 9 of a relay 8 to be periodically closed and opened, enabling an alternating current contactor 11 to be attracted when the contact 9 is attracted, enabling a terminal 1 of a 4K L1408 type bus terminal module 4 to receive a high level, enabling a P L C3 to record a rising edge and a falling edge of the high level, triggering the rising edge once, adding 1 to an 'opening frequency' in the visual interface, triggering once to a falling edge, adding 1 to an 'closing frequency' in the visual interface, and recording specific numerical values of the 'opening frequency' and the 'closing frequency' in the visual interface after the fuse to be tested is fused.

As shown in fig. 2, "reset" is a reset button, and when the reset button is clicked, the values of "pull-in time", "opening times", and "closing times" are cleared.

While the embodiments of the present invention have been illustrated and described in detail in the drawings attached to the specification, it will be understood by those skilled in the art that the above embodiments are only preferred embodiments of the present invention, and the detailed description is only for the purpose of helping the reader to better understand the spirit of the present invention, and not for the limitation of the protection scope of the present invention, on the contrary, any improvement or modification made based on the spirit of the present invention should fall within the protection scope of the present invention.

Claims

1. The detection device for the front-end fuse of the contactor comprises a rectifier, a voltage regulator, a P L C, a plurality of bus terminal modules and a relay, and is characterized in that:

2. The device for detecting the front end fuse of the contactor according to claim 1, wherein:

the P L C is BX 3100.

3. The device for detecting the front end fuse of the contactor according to claim 1, wherein:

the first bus terminal module, the second bus terminal module, the third bus terminal module and the fourth bus terminal module are Kfu K L1408, K L2408, K L3403 and K L9010 type bus terminal modules respectively.

4. The device for detecting the front end fuse of the contactor according to claim 3, wherein:

the K L1408 model 1408 bus terminal module is a DI card, and the K L2408 model bus terminal module is a DO card.

5. The device for detecting the front end fuse of the contactor according to claim 3, wherein:

when detecting that the No. 1 terminal of the K L1408 type bus terminal module has high level input, the P L C internal logic controls the No. 1 terminal of the K L2408 type bus terminal module to output high level, thereby controlling the relay to be electrified.

6. The device for detecting the front end fuse of the contactor according to claim 3, wherein:

the K L3403 type bus terminal module is a measuring card piece, and has the function of measuring the current value with the precision of 1 mA.

7. The device for detecting the front end fuse of the contactor according to claim 1, wherein:

p L C editions visual interface contains the start, resets and the circulation test button, shows AC contactor's third contact and fourth contact the actuation time phase line current value of voltage regulator AC contactor's third contact and fourth contact the actuation, the disconnection number of times.