JPH0591148U - Automatic synchronization circuit - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain an automatic synchronous closing circuit that can smoothly and reliably close the power breaker. [Configuration] Voltage adjustment signal 13 by generator selection signals 10 and 11
A switching device (16) for switching between and, and an automatic synchronization insertion device (12).

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to an automatic synchronous closing circuit of a circuit breaker in a private power generation facility.

[0002]

[Prior Art]

 FIG. 2 is a circuit diagram showing a conventional automatic synchronization input device. In the figure, 1 is a power purchasing system, 2 is a power receiving circuit breaker that connects a generator and power purchasing, 3a and 3b are generator circuit breakers, 4a and 4b are generators, and 5a and 5b are power factor limiting functions. 6,7,8a, 8b is an instrument transformer, 9a, 9b is an instrument current transformer, 10 is a G1 selection signal, 11 is a G2 selection signal, and 12 is a power interruption circuit 2. An automatic synchronous closing device that issues a command, 13 is a voltage adjustment signal, 14 is a command to close the power breaker 2, and 15 is a power generation busbar.

Next, the operation will be described. The automatic synchronizing device 12 detects the voltage through the voltage transformers 6 and 7 so that the voltage value and the phase at both ends of the power receiving circuit breaker 2 are the same, and the generator select signal 10 (11) is the automatic voltage. The voltage adjustment signal 13 is output to the adjustment device 5a (5b). The voltage of the power generation bus 15 rises or falls by the selected generator 4a (4b), which coincides with the purchased voltage. The automatic synchronous closing device 12 which has detected the coincidence outputs the closing command 14 and the power receiving breaker 2 is closed.

[0004]

[Problems to be solved by the device]

 Since the conventional automatic synchronous closing circuit is configured as described above, when the generator selected for voltage adjustment raises (decreases) the voltage when there are multiple generators, it is not selected. The power factor limiting function has been released, and the generator has an operation to decrease (increase) the voltage, the voltage on the power purchase side does not match the voltage on the power generation side, and the power breaker is not turned on. In addition, there was a problem that the generator trips when the generator not selected operates in the voltage rising direction.

The present invention has been made to solve the above problems, and even when there are a plurality of generators, it is possible to adjust the voltage on the power generation side to the voltage on the power purchase side automatically. The purpose is to obtain a synchronization input circuit.

[0006]

[Means for Solving the Problems]

 The automatic synchronizing circuit according to the present invention outputs a voltage adjustment signal to the selected generator, and outputs a power factor limited use signal to the non-selected generators to indicate whether the voltage rises or falls. It is a limitation.

[0007]

[Action]

 The automatic synchronous closing circuit in this invention has a voltage rise or a voltage drop above a certain value because the generators not selected are limited by the power factor, and the voltage of the power generation bus is selected by the selected generator. Is adjusted, the voltage across the power breaker can be adjusted, the power breaker is turned on, and failure to turn on the power breaker is prevented.

[0008]

【Example】

 Example 1. Embodiment 1 of the present invention will be described below with reference to the drawings. In FIG. 1, which shows the automatic synchronizing circuit according to the first embodiment of the present invention, reference numerals 1 to 14 are the same as or equivalent to those of the conventional example, and the description thereof will be omitted. 16 is a switching device for switching the output destination of the voltage adjustment signal, and 17 is a power factor limited use signal.

Next, the operation will be described. The voltage adjustment signal 13 is the selection signal 10 from the switching device 15.
(11) is output to the generator 4a (4b) which is in contact. A power factor limited use command is output to the generator 4b (4a) not selected. As a result, the voltage change of the generator busbar by the unselected generator 4b (4a) is suppressed, the voltage of the generator busbar is adjusted by the selected generator 4a (4b), and the voltage across the power breaker 2 becomes the same. The automatic synchronous closing device 12 outputs a closing command of the power breaker 2.

Example 2. In the first embodiment, the case of interruption of power reception has been described, but the same effect can be obtained by turning on the busbar breaker.

[0011]

[Effect of the device]

 As described above, according to the present invention, when the automatic synchronization is turned on, one of the plurality of generators is used for voltage adjustment and the other is used for limiting the power factor, and the voltage adjustment is locked. This has the effect of reliably turning on the power breaker.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a configuration of an automatic synchronization closing circuit according to a first embodiment of the present invention.

FIG. 2 is a circuit diagram showing a configuration of a conventional automatic synchronization closing circuit.

[Explanation of symbols]

 1 Power purchase system 2 Power receiving circuit breaker 3 Generator circuit breaker 4 Generator 5 Automatic voltage regulator 6 Meter transformer 7 Meter transformer 8 Meter transformer 9 Meter current transformer 10 G1 selection signal 11 G2 selection Signal 12 Automatic synchronous closing device 13 Voltage adjustment signal 14 Closing command 15 Generator bus 16 Switching device 17 Power factor limited use signal

Claims (1)

[Scope of utility model registration request] 1. An automatic synchronization closing circuit having a switching device for switching a voltage adjustment signal of the automatic synchronization closing device in a circuit for automatically synchronizing the power breaker in a private power generation facility having a plurality of generators.