JP2006006093A - Three-phase ac generator equipped with power/lamp common-use type prime mover - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a generator equipped with a concurrent power/lamp common-use type prime mover that can concurrently feed power to power/lamp same capacity loads that are driven by three-phase power and D-cell lamp electricity, respectively. <P>SOLUTION: Both the loads driven by three-phase power and D-cell lamp electricity, respectively, can be operated at the same capacities by the single generator by arranging and connecting one set of a single winding transformer of a winding ratio of 1 (hereinafter called as a balancer) to two arbitrary external output terminals of the three-phase AC generator equipped with the prime mover. The simultaneous power feeding of power/lamp same capacities is enabled by combining the balancers of one tenth to one fiftieth of the capacity of the single generator, and since a commercial linkage system can be applied with a power/lamp common-use method by a three-phase neutral point grounding Y-type power supply system and the three-phase AC generator, high-harmonic interference can be suppressed, and an earth voltage can be kept low, thus securing safety. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

In the present invention, a single generator can simultaneously supply power to two different capacity loads of three-phase power and AA lamps, and a three-phase AC generator with a motor-operated motor that can be operated in conjunction with a commercial power supply system and a Y-type generator. The present invention relates to a neutral point grounded high voltage power receiving facility.

In a conventional motor-driven generator with a motor, a special transformer, a Scott transformer, or an inverter type is used or equipment is expensive because of the difference in voltage in order to supply AA power.
Normally, the internal connection of a three-phase AC generator with a prime mover is generally a Y connection and a neutral point grounding system, and the drive prime mover, generator, cooler, and other auxiliary equipment can be moved compactly. The power supply system is mainly three-phase AC 210V, 400v, 3300v, 6600v or single-phase three-wire 210V / 105V.

Generally, in the distribution line, power is supplied by an AC single-phase three-wire type 210V / 105V for electric power, and for power by an AC three-phase three-wire type 210V. The same applies to the power supply from the generator.
In the conventional method, generators with motors for three-phase and AA are used separately, but the power supply system for three-phase load and AA load is heavy and large with only one unit for three-phase, It took a lot of installation space, and both copper loss and iron loss increased, and it took a lot of loss for customers and was expensive.
Non-Patent Literature Transformer Usage Manual October 1995 OM Corporation Non-Patent Literature Power Transmission / Distribution March 1982 OM Corporation P-104 Chapter 4 4-5 Single-phase Three-wire System

In order to supply power to AC three-phase three-wire 210V and AC single-phase three-wire 210V / 105V load simultaneously with a single three-phase AC generator with a motor, operation at normal voltage is necessary due to the difference between the generator voltage and the equipment voltage used. There is a method using a single-phase three-wire transformer with a voltage regulator or a Scott transformer, which was impossible, but in any case, voltage regulation equipment must be specially ordered. -It is necessary, heavy, large and expensive, and it is not much used except for emergency generators.

At present, simultaneous use of three-phase and AA-capacity capacitors with the same capacity is not possible. In particular, the general-purpose type can only supply power with two dedicated generators for three-phase and AA, and the customer's expenses were expensive.

By installing and connecting a single-winding transformer (hereinafter referred to as a balancer) with a turns ratio of 1 to any two external output terminals of a motorized three-phase AC generator, The three loads can be operated at the same capacity with the same capacity and become a three-phase AC generator with a motor for driving lights.

In the case of supplying power to two loads of three-phase and AA with a general motor generator, three generators for the three-phase, one for the single-phase and two generators were conventionally required for each purpose. By adopting it, it is possible to supply power to two loads simultaneously by supplying power from a single three-phase AC generator. Loss can be reduced and the voltage fluctuation rate can be improved to save energy and save power. Costs such as generator rent, cable material costs, labor costs, truck transportation costs, fuel costs, etc. will be reduced, and social contribution will be possible.

BEST MODE FOR CARRYING OUT THE INVENTION Example

Three-phase 210V, single-phase 210V, single-phase 210V, single-phase three-wire 210V / 105V power supply can be easily taken and used simultaneously. As for the single phase 105V, since the balancer itself balances the balance between the balancer U-0-V and the external line 0, the balancer itself needs an unbalanced capacity. Even if the load balance between the two external lines is unbalanced, the current flowing in the neutral gland of the balancer is 0A and the voltages on both sides are the same. The balancer is used in the single-phase three-wire wiring system with the least power loss. The voltage fluctuation rate is small. AA power supply can load up to 35% of generator capacity, and even when AA power supply is 35%, three-phase power supply can be up to 65%. Generator voltage is 440v, 3300v, 6600v, and there are various 200v For example.

In the present invention, as shown in FIG. 1, a three-phase AC generator (Y neutral point grounding) with a light-powered prime mover and a balancer are used for three-phase 210V and single-phase 210V / 105V (single-phase three-wire wiring). The same capacity of power can be supplied to the load at the same time. Each line voltage of the external terminals U, V, W is for three-phase 210V, and a balancer with a specific capacity of 1/10 to 1/50 of the rated capacity of the generator between any two external output terminals. Installed and connected, the generator secondary voltage U-V is 210V and the voltage between both outer lines and the middle point (0) is 105V. By further adjusting the voltage, power (w) = voltage (v) x current With (i ₂ ), it is possible to secure an appropriate voltage of 96 v at the wiring terminal, energy saving can be achieved, and fuel costs can be reduced.

Fig. 2 shows an explanatory diagram of the connection of the three-phase AC generator with a motor for driving use according to the present invention in the commercial linkage system. When linking, the low-voltage secondary side connection of the power receiving transformer is a Y neutral point grounding type. In this case, the generator side neutral wire grounding must be removed.

FIG. 3 is an explanatory diagram of the balancer's specific capacity and the direction of the unbalanced current. As shown in FIG. 100V60A. The allowable unbalanced current is 30A.

In the one-line grounding system shown in FIG. 4, the charging current including the harmonics becomes a vector sum, which is amplified and used as a source of false alarms such as alarms. In the conventional one-line grounding system as shown in FIG. The charging current including harmonics becomes the vector sum of I _AC + I _BC , and the ground line current of √3I _AC = √3I _BC increases, resulting in a ground alarm and the like, which is the source of false alarms.

In the neutral grounding system shown in Fig. 5, the charging currents including harmonics cancel each other, and an explanatory diagram is shown that does not result in false alarms. Charging current including harmonics generated inside the wiring is IA + IB + IC = 0A, which is canceled out by vector sum, does not cause trouble due to false alarms, does not bother electricity, and has a low ground voltage of 115V, making it safer Become a system.
The generator is a synchronous type, induction type, or Y-connected neutral wire grounding type. In the case of co-operation with commercial power supply, since the grounding wire of the power receiving transformer is used, the generator side neutral wire grounding must be removed. Absent.

As a result of diligent research applying the electrical features of the balancer, a three-phase AC generator with a moving motor and a neutral-grounded three-phase AC lamp can be used. It became possible and came to the invention.

As shown in Fig. 6, if there is no balancer,
As a single-phase three-wire supply system, the load current generally used most often flows in the same direction.
Each of the connected voltage circuits flows (i is A → B → N ′ → N → A i ₂ is N → N ′ → D → C → N). Therefore, the difference between the load currents of the two external lines flows through the neutral line. When the direction is i ₁ > i ₂ , (i ₁ -i ₂ ) is from N ′ to N, and i ₁ <i ₂ When (i ₂ −i ₁ ) changes from N to N ′, and when the balanced load i ₁ = i ₂ , it becomes zero. (Load current is external current)

In summary,
The load current flows in the same direction, and a difference in load current flows through the neutral line. The voltage on the neutral line and both external lines works to rise on the light load side and to fall on the heavy load side. The power loss of the wiring is higher than that of the balancer installation.

The characteristics of a single-turn transformer (hereinafter referred to as a balancer) having a turn ratio of 1 in single-phase three-wire wiring are as follows. When the balancer is installed, as shown in FIG. 7 which shows the current distribution when there is a balancer,
Unlike the load current, the balancer current has the same magnitude and opposite directions.
It flows to balance the line current. It flows so that the current of both outer lines is equal.
When i ₁ > i _2, the current flows in the direction of the solid arrow, and when i ₁ <i ₂ , the current flows in the direction of the dotted arrow, and the balancer current is C → B for the upper circuit as shown in the figure. → A → N ′ → N ″ → C, and the lower circuit flows as F → E → D → N → N ′ → N ′ → F (does not flow to the load). It becomes like.

In summary,
The larger outer line current decreases, and the smaller outer line current increases. Half of the neutral current in the absence of a balancer. The phase voltage between U-0-V is equal. Both outside lines Even if the V-side current is unbalanced, the neutral line current of the balancer is 0A. The power loss of the wiring is one half of the neutral line current without a balancer.

As shown in FIG. 7, when a balancer is installed, as described in the current distribution, E ₁ works to rise and E ₂ works to fall, E ₁ = E ₂ , inflow current = outflow current, Since the balancer can balance the outside line, the balancer is a transformer with a turns ratio of 1, so the inherent 3KVA has an allowable unbalanced current of 30A. If the unbalanced current is large in the existing AA distribution line, or if the neutral line current is large Adjusting the load balance or increasing the balancer's specific capacity reduces the line loss and saves energy. This is utilized for the generator with motor, commercial linkage generator and cogeneration system of the present invention. It is a thing.

Taking a three-phase AC generator with a 50 kVA motor as an example, a three-phase 200 V load 15 Kw, a single-phase 200 V load 5 Kw, a single-phase 100 V load 10 Kw, and a total AA load 15 Kw power factor 100%,
1. With a three-phase load of 0 Kw, you can pay up to 25 KVA when the AA load power factor is 100%.
2, AA load 0Kw can be paid up to 50KVA at three-phase load power factor of 100%.
3. The sharing of burden between the three-phase and single-phase power sources is flexible.

The connection explanatory drawing of the three-phase three-wire generator with a moving light source type | mold motivator of this invention, and a balancer. The connection explanatory drawing by the commercial linkage wiring system of the three-phase three-wire generator with a moving light source type | mold motivator of this invention. Explanatory drawing of the specific capacity | capacitance of a balancer, and the direction of unbalance current. In the one-line grounding method, the charging current including the harmonics is a vector sum, and the grounding current increases, resulting in a false alarm. Neutral wire grounding method is an explanatory diagram that charging currents including harmonics cancel each other with vector sums and do not cause false alarms. Current distribution explanatory diagram when there is no balancer with AA wiring. Current distribution explanatory diagram when there is a balancer with AA wiring.

Claims (2)

By installing a single-winding transformer with a turns ratio of 1/10 to 1/50 of the generator capacity and connecting it to two optional external output terminals in one motorized three-phase AC generator A generator with a prime mover that can simultaneously supply power to the same capacity load of three-phase power and AA lamps. Combining the generator according to claim 1 with a space-saving wiring-type high-voltage power receiving facility for use with a moving light with the neutral point of the secondary Y-connection of the three-phase AC transformer combined, reduces wiring loss and the wiring system A ground-operated generator with a prime mover that features a low ground voltage of √ / 3 of the line voltage, ensuring higher safety and suppressing harmonic interference.

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