JPS62293995A - Induction generating apparatus - Google Patents

Abstract

PURPOSE:To prevent an induction generator from generating self-excited in outage of power source, by interposing a three-phase three-winding transformer between a three-phase induction generator and the power source system. CONSTITUTION:The primary winding 2 of a three-phase three-winding transformer 1 is connected to the power source, the secondary winding 3 to the load and the tertiary winding 4 to an induction generator 6 through a breaker 5 respectively. In operating the generator 6 if the power is cut off while the system is connected to the primary winding, then the generator 6 is forced to stop when the power flowing into the primary winding 2 falls down less than the set value. In case the control system does not work and the condition to cause the self-exciting phenomenon is satisfied, that is, in case there is relatively large electrostatic capacity in the load, the leading current of generated power flows through the secondary winding 3 and the tertiary winding 4 of a transformer 7 and it does not flow backward to the system as the electric power, so that the safety on the system side is well aswured.

Description

DETAILED DESCRIPTION OF THE INVENTION 3. Detailed Description of the Invention The present invention relates to an induction power generation device used for the purpose of reducing supplied power at a power consumer.

Induction generators are widely used as a means to compensate for power shortages because they have the advantage of not causing disturbance or other disturbances to the grid. Power may be generated automatically.

The present invention provides a safe induction power generation device that does not allow backflow to the TRi side under any conditions, and includes a three-phase 3A line transformer interposed between the three-phase induction generator and the power supply system,
The system, induction generator, and load king are individually connected to each winding.

The device of the present invention will be explained with reference to the drawings.

(1) is a three-phase 38-wire transformer, and (2) is the primary connected to the power supply! ! 5 wire, (3) is secondary and the load is connected. (4) is the tertiary winding, and the circuit breaker (
5) to the induction generator (6).

(?) (8) is a transformer and a transformer, (9) is an underpower relay, (lO) is a power source detection control device, (11)
is the power generation type control means.

The generator (8) is configured such that the power flowing into the -order winding is set 116
When this occurs, it is activated by a power generation command issued from a demand control device (not shown), and is stopped by a stop command when the primary power falls below the set value even during operation.

If a power outage occurs while the generator is connected to the primary winding in the detour rlJ, the generator will be stopped due to the above conditions, but if the control JI system does not work and the conditions that cause the self-excitation phenomenon occur. If this is satisfied, that is, if there is a relatively large capacitance in the load, the leading current of the generated power will flow through the secondary and tertiary windings of the transformer and will not flow back into the grid as TL power, so it will not flow back into the grid. This will ensure the safety of both parties.

[Brief explanation of the drawing]

The figure is a connection diagram of the device of the present invention. '-go-4

Claims (1)

[Claims] A three-phase, three-winding transformer is interposed between the grid and the on-site induction generator, with the grid on its primary winding, the on-site load on its secondary winding,
An induction generator is an induction generator connected to a tertiary winding.