CN211183421U

CN211183421U - Power-saving protection device

Info

Publication number: CN211183421U
Application number: CN202020058164.0U
Authority: CN
Inventors: 杨玉昌; 吴龙妹
Original assignee: Shenzhen Dianzhangmen Energy Saving Technology Co ltd
Current assignee: Shenzhen Dianzhangmen Energy Saving Technology Co ltd
Priority date: 2020-01-13
Filing date: 2020-01-13
Publication date: 2020-08-04
Anticipated expiration: 2030-01-13

Abstract

The utility model discloses an economize on electricity protection device, including three routes current transformer, circuit breaker, bypass contactor, zero setting transformer and the fuse that links to each other in proper order. The utility model can restrain and eliminate the peak and burr of the pollution sine wave, and effectively reduce the harmonic content of the system; line loss can be reduced, and metering accuracy is ensured; the purpose of saving electricity is achieved, electrical equipment can be protected, maintenance and replacement cost is reduced, and burden of the transformer is relieved; for the motor group load, the device has obvious electricity-saving effect.

Description

Power-saving protection device

Technical Field

The utility model relates to a transformer technical field especially relates to power saving protection device.

Background

The utility company delivers power at a higher voltage considering losses in the delivery of power and the fact that the end user voltage is too low during peak hours, so the user devices are typically subjected to a higher voltage than the rated voltage. In addition, the voltage fluctuation range is large due to the influence of the power grid load, and especially in the early morning hours, the power supply voltage is higher under the condition that a large-scale power load does not work. When the electric equipment runs in a state higher than the rated voltage, the electric equipment cannot run more effectively, and the power consumption loss is increased. For equipment such as a transformer, a motor, an alternating current contactor, a ballast, an electromagnet and the like with a winding and an iron core, the iron core loss is in direct proportion to the square of voltage, the voltage rises, the iron core loss is increased, the temperature rise of the winding is increased due to long-term operation, the insulation is aged, and the service life is shortened.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the problems and provide an electricity-saving protection device, which comprises a current transformer, a circuit breaker, a bypass contactor, a zero setting transformer and a fuse, wherein the three current transformers, the circuit breaker, the bypass contactor, the zero setting transformer and the fuse are sequentially connected;

the zero setting transformer comprises a three-way voltage transformation circuit; the transformer circuit comprises an iron core, a first coil, a second coil, a third coil and at least one middle contactor;

the output end of the circuit breaker is connected with the input node of the bypass contactor and the first node of the first coil; the output node of the bypass contactor is connected with a second node of the first coil and a first node of the second coil; at least one path of intermediate contactor loop is arranged between the second node of the second coil and the first node of the third coil; a third node of the third coil is connected with a common end of the zero setting transformer;

and the output node of the bypass contactor is connected with the fuse.

The beneficial effects of the utility model reside in that: the utility model adopts the Z-shaped harmonic shielding winding, which can restrain and eliminate the peak and burr of the pollution sine wave, effectively reduce the harmonic content of the system, not only reduce the copper loss and iron loss of the transformer and the electric equipment, but also reduce the line loss, and ensure the accuracy of the measurement; by monitoring the load change condition, adjusting and stabilizing the input voltage of the equipment, the equipment is enabled to operate under the rated voltage, the inflow of invalid electric quantity is prevented, and redundant energy is fed back to a power grid, so that the aim of saving electricity is fulfilled, the electrical equipment can be protected, the maintenance and replacement cost is reduced, and the service life of the electrical equipment is prolonged; meanwhile, the device also reduces the burden of the transformer and relatively increases the output capacity of the transformer, thereby increasing the use capacity of users.

Drawings

Fig. 1 is a circuit diagram of the present invention;

FIG. 2 is a waveform of a phase voltage not accessed by the present device;

fig. 3 is a waveform diagram of a phase voltage applied to the device.

In the figure: TA1, TA2, TA 3-Current transformers; r1, S1, T1-zero transformer input node; A. b, C-first node of the first coil; x, Y, Z-second node of the first coil; a. b, c-a first node of the second coil; k1, K2, K3 — second node of second coil; x1, y1, z1 — first node of third coil; x2, y2, z2 — the second node of the third coil; x3, y3, z3 — the third node of the third coil; KM 1-first contactor; KM 2-second contactor; KM 3-third contactor.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings:

as shown in fig. 1, the power-saving protection device of the present invention comprises a current transformer, a circuit breaker, a bypass contactor, a zero setting transformer and a fuse, which are connected in sequence;

and the output node of the bypass contactor is connected with the fuse.

Further, the zero setting transformer further comprises a second contactor; the third coil is provided with a second node; the second node of the third coil is connected to the second node of the second coil through a second contactor.

Further, the zero setting transformer further comprises a third contactor; and the second node of the second coil is connected with the common node through a third contactor node.

The three-phase voltages have equal amplitude values, and the phase difference is stabilized at 120 degrees, so that the voltage transmitted to the electric equipment is balanced and stable, and the extra loss of zero line current is reduced. During normal operation of the equipment, the load regulation can be carried out, electricity can be automatically saved, and special people are not required to operate and manage; the contactor is arranged at the node of the transformer coil, and the transformer coil is automatically adjusted through the contactor contact so as to adjust the output voltage without changing the control state of the original circuit.

The circuit breakers of the three-phase circuit are linked through circuit breaker contacts, and the middle contactor of the three-phase circuit is linked through contacts. And the input node of the zero setting transformer is connected with the input node of the first coil and the input node of the bypass contactor. The first coil is also connected with the second coil and an output node of the bypass contactor; two nodes of the third coil are connected with the second coil through an intermediate contactor; and the tail ends of the third coils of the three-phase circuit are connected with a common node of the regulating transformer. And the impedance adjustment of the third coil access is realized by controlling the opening and closing of the contact of the middle contactor, so that the voltage transformation output adjustment is realized. As shown in fig. 1, a first contactor is arranged between the second node of the second coil and the first node of the third coil; a second contactor is arranged between the second node of the second coil and the second node of the third coil; second nodes of the second coils of the three-phase circuit are connected with a common node through a third contactor.

The utility model discloses set up bypass circuit, can switch between economize on electricity mode and bypass mode (non-economize on electricity mode), can not lead to the outage because of this power saving equipment's reason.

The Z-shaped harmonic shielding winding is adopted, so that the peaks and burrs of the polluted sine wave can be inhibited and smoothed, and the harmonic content of the system can be effectively reduced, wherein a phase voltage waveform before the device is accessed is shown in figure 2, and a phase voltage waveform after the device is accessed is shown in figure 3; the method can reduce the copper loss and the iron loss of the transformer and the electric equipment, reduce the line loss and ensure the metering accuracy.

By monitoring the load change condition, adjusting and stabilizing the input voltage of the equipment, the equipment is enabled to operate under the rated voltage, the inflow of invalid electric quantity is prevented, and redundant energy is fed back to a power grid, so that the aim of saving electricity is fulfilled, the electrical equipment can be protected, the maintenance and replacement cost is reduced, and the service life of the electrical equipment is prolonged; meanwhile, the device also reduces the burden of the transformer and relatively increases the output capacity of the transformer, thereby increasing the use capacity of users.

The starting current of the motor is generally 4-7 times of the rated current, after the power-saving device is added, the impedance ZF is connected in series in the power supply loop of the motor, which is equivalent to implanting a magnetic control type soft starter, the starting current can be reduced to 2-3 times of the rated current, and the device has obvious power-saving effect on the motor group load.

The technical scheme of the utility model is not limited to the restriction of above-mentioned specific embodiment, all according to the utility model discloses a technical scheme makes technical deformation, all falls into within the protection scope of the utility model.

Claims

1. The power-saving protection device is characterized by comprising a current transformer, a circuit breaker, a bypass contactor, a zero setting transformer and a fuse which are sequentially connected in three ways;

and the output node of the bypass contactor is connected with the fuse.

2. The power-saving protection device according to claim 1, wherein the zero-setting transformer further comprises a second contactor; the second node of the third coil is connected to the second node of the second coil through a second contactor.

3. The power-saving protection device according to claim 1, wherein the zero-setting transformer further comprises a third contactor; and the second node of the second coil is connected with the common node through a third contactor.

4. The power-saving protection device according to claim 1, wherein the three-way transformer circuit has equal three-phase voltages and 120 degrees phase difference.