CN2496118Y

CN2496118Y - Power-factor adjustable transformer

Info

Publication number: CN2496118Y
Application number: CN 01262645
Authority: CN
Inventors: 王万俊
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-09-06
Filing date: 2001-09-06
Publication date: 2002-06-19
Anticipated expiration: 2011-09-06

Abstract

The utility model relates to a power factor adjusting transformer, which belongs to a transformer. The utility model is characterized in that a sliding carbon brush is connected on the winding of a power supply transformer, and the output end of the sliding carbon brush is connected with a power factor meter and an electric motor; the power supply transformer is a three phase transformer; each low voltage winding of the three phase transformer is connected with the sliding carbon brush, or the high voltage winding is connected with the sliding carbon brush. By adjusting the position of the sliding carbon brush on the transformer, the output voltage of the transformer is adjusted, namely the running voltage of the electric motor, observing the power factor meter, the high and the low of the powder factor of the circuit is got, therefore the utility model solves the problems that the powder factor is low and the electric energy consumption is high during the operating process of the asynchronous motor, and improves the deficiency of capacitance compensation. By adopting the transformer, no matter whether the loading of the asynchronous motor is high or low, the powder factor can be adjusted to over 0.9, and the powder factor is easy to adjust and simultaneously the transformer also has the obvious energy saving effect.

Description

Power factor is adjusted transformer

Technical field

The utility model relates to a kind of transformer, and specifically this transformer is that a kind of power factor that is used with asynchronous motor is adjusted transformer.

Background technology

Transformer has an iron core, is connected with high pressure winding and low pressure winding on iron core, applies voltage on the high pressure winding of transformer, obtains a low-voltage by the iron core induction on its low pressure winding, connects load and promptly form low voltage power distribution network on the low pressure winding.In China's countryside low-voltage electric distribution network network, use asynchronous motor in a large number, make the power factor of electrical network lower, meritorious, capacity of idle power loses bigger, has directly influenced power supply facilities utilance and economic benefit.At present, in order to improve power factor of electric network, method commonly used is that shunt compensation electric capacity improves the power factor of circuit in the low pressure winding circuit of transformer.But utilize capacitance compensation to have following shortcoming: electric capacity itself needs power consumption, increases electric energy loss; Puncture easily between capacitor plate, functional reliability is poor; Capacitor switching trouble etc. when adjusting power factor.

The technical staff is when designing by driving machinery, and all by mechanical maximum output apolegamy motor, in real work, owing to be subjected to multiple factor affecting, motor can not operate under the full load condition.Irritating most of working hour as farming row, farming, is to move row, below irritating the H-Max of equipment, is not running at full capacity, has influenced exerting oneself of motor like this, has caused therefore that the rural low voltage network power factor is lower, energy loss is higher.

Summary of the invention

Technical problem to be solved in the utility model is the deficiency that has changed capacitance compensation, has solved the problem that asynchronous motor power factor in service is lower, electric energy loss is bigger.

Solve the technical scheme that its technical problem adopts: connect slidding carbon brush on the winding of power transformer, the output of slidding carbon brush is connected with motor with power factor meter.

Power transformer is a three-phase transformer; Connect a slidding carbon brush on each phase low pressure winding of three-phase transformer, perhaps each connects a slidding carbon brush on mutually at the high pressure winding.

Beneficial effect: owing to adopt such scheme, by regulating the position of slidding carbon brush on transformer on the transformer, adjust the output voltage of transformer, it is the working voltage of motor, observe power factor meter, can learn the high and low of power factor in the circuit, solve the problem that asynchronous motor power factor in service is lower, electric energy loss is bigger, change the deficiency of capacitance compensation.No matter adopt this transformer asynchronous motor payload, power factor can transfer to more than 0.9.The adjustment power factor is convenient, also has remarkable energy saving effect simultaneously.Power factor is at the unloaded motor below 0.5, and power factor is transferred to more than 0.9, can save meritorious electric weight about 60%, saves capacity of idle power about 70%.Power factor is at 0.6,0.7,0.8 service meter, and power factor is transferred to more than 0.9, and can save meritorious electric weight is respectively about 30%, 20%, 10%, saves capacity of idle power about 40%, 30%, 20%.

Description of drawings

Fig. 1 adjusts the first embodiment connection layout of transformer for power factor.

Fig. 2 adjusts the second embodiment connection layout of transformer for power factor.

Embodiment

Embodiment 1: in Fig. 1, transformer has three iron cores 2, be connected with a high pressure winding 1 and a low pressure winding 3 on each iron core 2, there is single line to connect back connecting to neutral line jointly in three groups of high pressure windings 1, other is connected with A, B, the C triple line of the high-voltage line of importing respectively, low pressure winding 3 has a common terminal, fixedly output 5 and slidding carbon brush 4 outputs, be connected the electrical appliance of normal voltage on common terminal and the fixing output 5, public output is connected with power factor meter 6 with motor 7 with slidding carbon brush 4 outputs simultaneously.

Transformer core 2 is made circle sections core, and iron core 2 sectional areas determine that by the transformer efficiency size iron core 2 circle internal diameters determine that by low pressure winding 3 wire diameters low pressure winding 3 is arranged and should be advisable with individual layer.At the internal layer coiling high pressure winding 1 of iron core 2, at the outer coiling low pressure winding 3 of iron core 2, low pressure winding 3 sectional area of wire should be determined by polishing back effective area, the back polishing well of low pressure winding 3 usefulness epoxide-resin glues.Three single-phase transformer branch upper, middle and lower symmetries are installed and fixed, and middle installation can be around the action bars of ring shape iron core rotation, and action bars is selected insulating material for use---and nylon is made.Three slidding carbon brush 4 are installed on the action bars, slidding carbon brush 4 contacts with low pressure winding 4 well, the contact-making surface size is determined by the rated current size, expose from the transformer case top upper end of action bars, stepping motor is installed in the action bars upper end, the capacity of stepping motor is pressed the action bars torque magnitude and is determined, the control button of stepping motor on indoor control panel is electrically connected, press control button according to power factor meter 6, thereby stepping motor rotates the output voltage that changes transformer, make motor 7 operations, observe power factor meter 6 more than 0.9.

Embodiment 2: in Fig. 2, connect slidding carbon brush 4 in each of transformer three-phase high-voltage winding 1 on mutually, high pressure incoming line A, B, C are connected with slidding

carbon brush

4, and 3 whiles of low pressure winding of transformer are connected with power factor meter 6 with motor 7, other and embodiment 1 omit together.

Claims

1, a kind of power factor is adjusted transformer, mainly comprises iron core, high pressure winding, low pressure winding, and it is characterized in that: connect slidding carbon brush on the winding of power transformer, the output of slidding carbon brush is connected with motor with power factor meter.

2, power factor according to claim 1 is adjusted transformer, and it is characterized in that: power transformer is a three-phase transformer; Connect a slidding carbon brush on each phase low pressure winding of three-phase transformer, perhaps each connects a slidding carbon brush on mutually at the high pressure winding.