CN111654146A

CN111654146A - Transformation of multifunctional junction box of large motor

Info

Publication number: CN111654146A
Application number: CN202010347076.7A
Authority: CN
Inventors: 吴永兵
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-04-28
Filing date: 2020-04-28
Publication date: 2020-09-11

Abstract

The invention belongs to the field of power equipment, and particularly relates to a large motor multifunctional junction box improvement, which comprises a junction box and a box cover, wherein two first handles are arranged on the box cover, an observation port is formed in the box cover, an opening door is arranged on the outer side of the junction box, an LED illuminating lamp is arranged on the side wall of the junction box, a temperature and humidity recorder, a full spectrum arc light probe and an arc light sensor are further arranged in the junction box, the arc light sensor is connected with the full spectrum arc light probe through an optical fiber, and the full spectrum arc light probe is connected with the temperature and humidity recorder through a resistance wire. The invention is convenient to operate and detect the internal condition of the high-voltage motor junction box on line, foresees whether condensation and damp phenomena exist in the motor junction box in advance, finds the loosening of the joint and realizes the arc light remote alarm function, has good safety and greatly improves the reliability of equipment operation.

Description

Transformation of multifunctional junction box of large motor

Technical Field

The invention belongs to the field of power equipment, and particularly relates to transformation of a multifunctional junction box of a large motor.

Background

At present, the state maintenance work of the national power industry starts, and the DCS state monitoring is realized on the temperature of a bearing and a coil and the vibration of a front bearing and a rear bearing during the operation of a high-voltage motor. The control of the running state indexes such as the wiring state of the motor junction box part, the motor insulation and the like is a technical difficulty. If the field electrical working personnel need to master the situations, the motor is stopped, safety measures are made, a work ticket is handled, and the motor junction box cover is removed, so that the motor wiring inspection and insulation detection can be carried out, and the routine inspection work is pointedly unavailable, so that the manpower and material resources are wasted, the direct contact with power failure high-voltage equipment cannot be avoided, the chance of electric shock risk is increased, and in addition, the fault rate of overheating of leads and joints in the motor junction box is high in recent years.

Disclosure of Invention

The invention aims to solve the technical problems and provides a safe multifunctional junction box which can check the wiring condition without power failure, can remotely receive the wiring operation condition without power failure and can predict the damp condition of a motor after power failure.

The utility model provides a multi-functional terminal box of large-scale motor is reformed transform, is including setting up terminal box and the lid on the motor, be equipped with two the first in command on the lid, the viewing aperture has been seted up on the lid, the viewing aperture is located the terminal box outside and is equipped with the door opening, install the LED light on the lateral wall of terminal box, the illumination end setting of LED light is inside the terminal box, the power interface end setting of LED light is outside at the terminal box, still install humiture record appearance, full gloss register arc light probe and arc light sensor in the terminal box, arc light sensor passes through optic fibre and full gloss register arc light probe connection, full gloss register arc light probe passes through the resistance wire and is connected with humi.

Furthermore, the bottom of the opening door is connected to the lower side of the observation port through a hinge, the top of the opening door is connected to the upper side of the lower side of the observation port through a lock key, and a second handle is arranged on the opening door.

Further, the viewing port is provided with organic glass.

Further, the resistance wire is 0.2mm²The fine copper wire of (2).

Further, the humiture record appearance has receiving arrangement through wireless sensor wireless connection.

Further, the temperature and humidity recorder and the arc sensor are matched with a 5V direct-current power supply.

Furthermore, a water-absorbing white cotton cloth is arranged on one side, located on the probe of the temperature and humidity recorder, of the junction box.

The invention has the following beneficial effects: 1. the internal condition of the high-voltage motor junction box can be conveniently checked on line, the conditions of cracking of an insulating sleeve, loosening and color change of a bolt, falling of a copper head, dust accumulation between phases and overheating of a joint can be found in time, precaution and treatment can be timely carried out, and serious electrical faults such as short circuit, grounding and the like can be prevented; 2. the temperature or humidity in the motor junction box exceeds the standard in a remote receiving mode, and whether condensation and damp phenomena exist in the motor junction box or not is predicted in advance; 3. the loosening of the joint can be found at the first time and the arc light remote alarm function can be realized on the premise that the high-voltage motor is not powered off; 4. the safety is good, the electrical working personnel can check whether abnormal phenomena such as dust deposition, overheating and insulation cracking exist in the junction box without opening the junction box, and the checking personnel can realize zero contact with electrical equipment; 5. no matter the equipment is operated or standby, the operation and maintenance personnel can remotely know indexes such as temperature, humidity and whether arc light is generated in the electrical box, and the safety targets such as early knowledge and early processing of hidden dangers of the equipment are achieved; 6. the multi-functional terminal box of motor, can discover power cable in the terminal box in the equipment operation, the motor internal lead, the hidden danger at positions such as motor joint, in time arrange hidden danger overhaul of the equipments, the further deterioration of equipment trouble has been avoided, and simultaneously, the motor is at the off-stream standby state, through the interior temperature of motor box, humidity alarm, we can foresee the inside condition of weing of motor terminal box, whether there is the condensation phenomenon in the analysis motor terminal box, if there is the condensation phenomenon, ventilate for the motor terminal box in advance and remove damp, the reliability of equipment operation has greatly been improved.

Drawings

FIG. 1 is a perspective view of a modified multifunctional junction box for a large-scale motor according to the present invention;

FIG. 2 is a schematic view of the inside of a modified multifunctional junction box for a large motor according to the present invention;

fig. 3 is a schematic diagram of the connection of a temperature and humidity recorder, a full-spectrum arc probe and an arc sensor which are transformed from the multifunctional junction box of the large-scale motor.

As shown in the figure: 1. a junction box; 2. a box cover; 3. a viewing port; 4. opening the door; 5. an LED lighting lamp; 6. a temperature and humidity recorder; 7. a full spectrum arc light probe; 8. an arc light sensor; 9. a resistance wire; 10. a receiving device; 11. white cotton cloth; 201. a first handle; 401. an articulation member; 402. a locking key; 403. a second handle.

Detailed Description

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

Some cases of problems with the current prior art are as follows:

a draught fan motor of a #4 furnace A of a certain power plant in 7 months and 23 days in 2015 is damaged in insulation due to the fact that an inner lead of a motor junction box is ground with a motor frame, an insulating layer is broken down in the starting process of the motor, and the lead is broken in a burst mode.

The B-phase lead wire in the motor junction box of the No. 3 furnace C powder exhauster of a certain power plant is broken in 2016, 12 and 30 days, wherein the B-phase epoxy resin porcelain bottle positioning threading hole is broken, and the high-voltage lead wire connector is broken and falls off; the epoxy resin porcelain bottle of the motor is overheated and breaks, and the root of the wiring terminal of the motor and the connection part of the lead wire are burst.

Case 3, certain power plant #3 river limit circulating water pump motor cause the inside moist gas of motor terminal box can't volatilize because of not being put into operation for a long time, and the siltation is in the motor terminal box, and 50 high low-speed switching terminal terminals of motor are just like 50 most advanced that discharge, and in the twinkling of an eye at the motor start, the inside moist air of motor blows to opposite metal covering along the not hard up hole of terminal. Under the action of high voltage and large current, the air insulation is broken down to form a large amount of hot ion current. In the case of a non-activated trip of the motor protection, a long-time arc burning phenomenon may be formed.

Aiming at the defects of the prior art, the invention has the following specific implementation modes:

a multifunctional junction box transformation for a large motor comprises a junction box 1 and a box cover 2 which are arranged on the motor, wherein two first handles 201 are arranged on the box cover 2, an observation port 3 is arranged on the box cover 2, the observation port 3 is positioned on the outer side of the junction box 1 and is provided with an opening door 4, an LED illuminating lamp 5 is arranged on the side wall of the junction box 1, the illumination end of the LED illuminating lamp 5 is arranged inside the junction box 1, the power interface end of the LED illuminating lamp 5 is arranged outside the junction box 1, a temperature and humidity recorder 6, a full spectrum arc light probe 7 and an arc light sensor 8 are further arranged in the junction box 1, the arc light sensor 8 is connected with the full spectrum arc light probe 7 through an optical fiber, the full spectrum arc light probe 7 is connected with the temperature and humidity recorder 6 through a resistance wire 9, the bottom of the opening door 4, the top of the opening door 4 is connected to the upper side of the lower side of the observation port 3 through a locking key 402, a second handle 403 is arranged on the opening door 4, and organic glass is installed on the observation port 3. The resistance wire adopts 0.2mm2 thin copper wire, temperature and humidity record appearance 6 is through wireless sensor wireless connection with receiving arrangement 10. Temperature and humidity recorder 6 and arc sensor 8 match have 5V DC power supply, be located temperature and humidity recorder 6's probe one side in terminal box 1 and be provided with hydroscopicity white cotton cloth 11.

Wherein the temperature and humidity recorder 6 adopts a ZL-TH10TP recorder with a probe type;

the full spectrum arc light probe 7 adopts a probe with the model of RHG 017;

the model of the arc sensor is RHG 617;

the resistance wire is wound by 0.2mm2 thin copper wire, and the resistance wire heats to 60 ℃ in 2 seconds under the action of a 5V direct current power supply.

The box cover center of the junction box is provided with the observation port, the outer side of the observation port is provided with the opening door, and the observation port is provided with the transparent organic glass plate, so that the internal condition of the junction box can be conveniently checked in an online manner when the high-voltage motor operates. The device can find the cracking of the insulating sleeve in time, the loosening and color change of the bolt, the falling of the copper head, the dust accumulation between phases and the overheating condition of the joint, and can take precautions and treatment in time to prevent serious electrical faults such as short circuit, grounding and the like.

When the motor belongs to a double-speed motor with high and low speed capable of being switched, the junction box consists of a wire inlet box, a neutral point box and a switching terminal box, a visual window and an opening door are additionally arranged on each junction box cover, an LED illuminating lamp or a strong light lamp and the like are additionally arranged at the bottom of the inner side of the junction box, the portable power supply is carried by a patrol worker, and when the wiring condition in the junction box is checked, the portable power supply can be connected to a power supply interface end of the LED illuminating lamp for checking.

The invention aims at the problems that the lead of the motor is easy to be affected with damp, particularly after the motor is stopped, the temperature difference between the inside and the outside of the box body is large, the humidity is large, and condensation is easy to form on the inner wall of the motor junction box, so that the insulation of the motor is low, so that a temperature and humidity recorder ZL-TH10TP developed by Beijing concentrated intelligent cooling technology company Limited is additionally arranged on the junction box, the recorder can remotely send temperature and humidity alarm signals to the hands of a user to remind that the temperature or the humidity of the motor exceeds the standard and the damp needs to be removed in time, and the on-site use condition of the motor and the humidity-. When the humiture recording instrument is used, the probe of the humiture instrument is placed at the top of the junction box, which is prone to condensation, and a piece of white cotton cloth which is prone to water absorption is laid under the probe of the humiture instrument, so that the accuracy and the stability of alarming of the humiture instrument are enhanced.

The invention is additionally provided with a full-spectrum arc light probe and an arc light sensor, and forms a full-spectrum arc light remote alarm device with a temperature and humidity recorder, the device is integrated with the probe of the temperature and humidity recorder, infrared light, ultraviolet light and natural light emitted by an electrical element in an overheating state are converted into electric signals after being collected by the full-spectrum probe, and then are converted into heat sources which are remotely sent to a receiving device of a user through the alarm device of the temperature and humidity recorder.

The full-spectrum arc light probe RHG017 can catch natural light in airtight dark terminal box, ultraviolet light, infrared light, and become the light pulse signal into the signal of telecommunication through arc light sensor RHG617,

control

3, 4 terminals and 5V power switch on can cut off the power supply by oneself after heating the resistance wire to 60 ~ 80 ℃ in the twinkling of an eye after 2 seconds, become the heat source into temperature signal after the resistance wire generates heat, convey to user's cell-phone through temperature, humidity recorder ZL-TH10T and look over, 7, 8 terminals of arc light sensor RHG617 can share 5V direct current power supply with humiture recorder ZL-TH10T, 2000mAh power can report to the police or once charges in one use quarter at every arc light in the scene.

Example (b): during the motor is in the period of shutting down, the relation of motor terminal box inner lead insulation and relative humidity confirms that humiture record appearance device sets up the humidity alarm value, and motor joint inner lead insulation is the insulating weak link of high-voltage motor, and generally large-scale 6KV motor stator core and coil pass through the vacuum dip coating, and relative humidity is little to its insulation value influence in the air, and the health condition that the whole insulation of motor will directly be influenced to the wet condition of its coil tip lead wire fixed insulation support, vase and lead wire outer insulation layer.

The specific implementation method comprises the following steps: spraying a certain amount of fog into the motor junction box by using a humidifier, keeping the relative humidity in the junction box at 60%, 70% and 80% for a period of time, and measuring the ground insulation of the three-phase terminal of the motor by using a 2500V insulation megger to obtain the following table data.

Relative humidity	42％	60% (30 minutes)	70% (30 minutes)	80% (30 minutes)
					15 second insulation value of motor	100MΩ	100MΩ	100M	0
60 second insulation value of motor	2000MΩ	1000MΩ	1000MΩ	0

The following conclusions were obtained: when the motor is in a standby state after being stopped, and the relative humidity in the air reaches more than 80%, the motor needs to be baked before being put into use, and particularly the relative humidity of the local position of the motor is emphasized in circulating water pump motors at the edges of rivers and seas. A relative humidity alarm mechanism is established.

The present invention and its embodiments have been described above, and the description is not intended to be limiting, and the drawings are only one embodiment of the present invention, and the actual structure is not limited thereto. In summary, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. The utility model provides a multi-functional terminal box of large-scale motor is reformed transform, is including setting up terminal box (1) and lid (2) on the motor, be equipped with two first in command (201) on lid (2), its characterized in that: the utility model discloses a light-emitting diode (LED) lamp, including lid (2), viewing aperture (3), light source interface end, light source end.

2. The transformation of the multifunctional junction box of the large motor as claimed in claim 1, wherein: the bottom of the opening door (4) is connected to the lower side of the observation port (3) through a hinge (401), the top of the opening door (4) is connected to the upper side of the lower side of the observation port (3) through a locking key (402), and a second handle (403) is arranged on the opening door (4).

3. The transformation of the multifunctional junction box of the large motor as claimed in claim 1, wherein: organic glass is installed at the observation port (3).

4. The transformation of the multifunctional junction box of the large motor as claimed in claim 1, wherein: the resistance wire is 0.2mm²The fine copper wire of (2).

5. The transformation of the multifunctional junction box of the large motor as claimed in claim 1, wherein: the temperature and humidity recorder (6) is wirelessly connected with a receiving device (10) through a wireless sensor.

6. The transformation of the multifunctional junction box of the large motor as claimed in claim 1, wherein: and the temperature and humidity recorder (6) and the arc light sensor (8) are matched with a 5V direct-current power supply.

7. The transformation of the multifunctional junction box of the large motor as claimed in claim 1, wherein: and a water-absorbing white cotton cloth (11) is arranged on one side of the probe of the temperature and humidity recorder (6) in the junction box (1).