JPH03291444A - Power system connection discriminating device for air-conditioner - Google Patents

Abstract

PURPOSE:To enable a connected state of a power system for each of air conditioners to be discriminated completely and automatically through an increasing or decreasing of an electrical current in a bus line by a method wherein a connected state for a single phase three-line type power supplying line of an air-conditioner is discriminated with a signal got from an increased or decreased electrical current sensing means. CONSTITUTION:At first, an air-conditioner 191 is operated, and the air conditioner is kept at its waiting condition for one minute. Upon completion of the waited condition, an electrical current value in a bus line 1 and its increased or decreased state are detected through an electrical current sensing means 110, an increased or decreased electrical current sensing means 120 and a bus line current delay means 130. Then, a got result is applied and in the event that the electrical current value in the bus line 1 is increased, it is discriminated that the air-conditioner 191 is connected to the bus line 1. In the vent that the electrical current value is not increased, it is discriminated that the air-conditioner 191 is not connected to the bus line 1. In addition, an electrical current in the bus line 2 is detected and similarly it is discriminated whether the air-conditioner 191 is connected to the bus line 2 or not.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a power system connection determination device for an air conditioner connected to a single-phase three-wire power supply line.

2. Prior Art As a conventional technology related to the present invention (as a power system connection for an air conditioner connected to a single-phase three-wire power supply line)
Problems to be Solved by the T Island Invention In the conventional method, each air conditioner has a means for inputting the grid connection status and determines the power grid connection by manually setting the grid connection status for each air conditioner. This method required a means to input the connection status, which had the disadvantage of increasing the size of the input means.Also, the connection statuses are: Connected between bus 1 and neutral wire Connected between bus 2 and neutral wire Connected status If you manually connect the system because there is a connection between bus 1 and bus 2, etc. If there are many air conditioners to be connected, the setting process itself will become complicated and there is a risk of incorrect settings. It's sexual.

Means for Solving the Problems The present invention (as described above) In order to solve the problems of the prior art, a power system connection determination device for an air conditioner is provided with a current in two bus lines excluding the neutral point of a single-phase three-wire power supply line. a current detection means for detecting an increase or decrease in the output signal of the current detection means; and a current increase/decrease detection means for detecting an increase/decrease in the output signal of the current detection means; and an air conditioner operating/stopping means for operating or stopping all or part of the air conditioner.

By using the means described above, the air conditioner's power system is controlled by controlling the operation of the air conditioner connected to the single-phase three-wire power supply line and detecting the currents of the bus 1 and bus 2. It is possible to determine the connection. Even if (L) only the current in bus 1 increases, the state is connected between bus 1 and the neutral wire.Also, if only the current in bus 2 increases, the connection is established between bus 2 and the neutral wire. If both the current value of the bus 1 and the current value of the bus 2 increase, it is possible to determine the status of each bus connected between the bus 1 and the bus 2.

Embodiment The basic configuration of this embodiment is as shown in FIG. 1, in which three air conditioners are connected to a single-phase three-wire power system.

Regarding the first embodiment in the case of the above configuration example, the first
This will be explained based on FIGS.

FIG. 1 shows a basic embodiment of the present invention,
Single-phase three-wire power line or main breaker (180) consisting of bus 1 (171), bus 2 (172), and neutral wire (173)
The air conditioner 1 (191) is connected between the bus 1 and the neutral line, and the air conditioner 2 (192) is connected between the bus 2 and the neutral line, and the air conditioner 3 is connected to the single-phase three-wire power line. (193) is connected between bus 1 and bus 2.

The current detection means (110) detects the bus 1 current by CTI (+1
1) and the amplifier (113) to detect the bus 2 current.
It is detected through T2 (112) and amplifier (114)'.

The current value detection output of each bus bar of the current detection means (110) is inputted to the current increase/decrease detection means (120).

The current increase/decrease detection means (120) periodically detects the current value and outputs the result of comparison with the previous detected value.

The bus current detection delay means (130) is controlled based on the output of the air conditioner operation/stop means (160). In other words, this is to obtain a detection delay time of a certain period from the start of operation of the air conditioner.

power system connection determination means (140) +, t, each bus current value obtained from the current detection means (110) and the bus current detection delay means (130) and the air conditioner 1 (191) connected to the single-phase three-wire power line; ), air conditioner 2 (192) and air conditioner 3 (193) all air conditioner stop means (150)
and the air conditioner] (191) by controlling the operation and stopping of the air conditioner through the air conditioner operation/stop means (160).
, determines the connection state of the single-phase three-wire power line of air conditioner 2 (192) and air conditioner 3 (193).

All Air Conditioner Stopping Means (+50) Table i When instructed by the power system connection determining means (140), the air conditioner operation/stopping means (+60) is operated to stop all air conditioners.

The air conditioner operation/stop means (160) includes a power system connection determination means (140) and an all air conditioner stop means (150).
), the air conditioner 1 (191), air conditioner 2 (192), and air conditioner 3 (193) are stopped via each interface (16L162.163).

Figures 2 and 3 are flowcharts describing a series of processes in this embodiment. Figures 2 and 3 are shown below.
The explanation will be based on the diagram.

Power system connection determination means (140) It receives the operation stop state signal of each air conditioner from the air conditioner operation/stop means (160) and determines whether all air conditioners have stopped (2
01). If all the air conditioners have not stopped, a signal is output to the all air conditioner stopping means (150) to stop all the air conditioners (202). After all the air conditioners are stopped, a period in which the restart of the compressor is prohibited occurs due to the control of the air conditioners themselves, so a standby state is set so that no connection determination is made during this time (203). This process is necessary because even if the air conditioner is started to perform the power grid connection determination process, the compressor will not start due to the prohibition of restarting the compressor, and there is a possibility that a misjudgment will be made due to the small amount of current change. It is.

Next, a power system connection check process is performed for each air conditioner.

FIG. 3 shows the connection determination process for the air conditioner l. First, the air conditioner is operated (301).

It remains in a standby state for one minute (302). There are two types of air conditioners: a fixed compressor rotation speed type and a variable compressor rotation speed type.In the case of a variable compressor rotation speed type, it takes time for the compressor rotation speed to rise to a certain extent. It's for a reason. In other words, it is necessary to wait until the current value increases to a certain extent. This process (302) is controlled based on the outputs of the bus current detection delay means (130) and the air conditioner operation/stop means (160). That is, a detection delay time of a certain period of time is obtained from the start of operation of the air conditioner. When the standby state ends, first, the bus 1 current is detected to determine whether or not it is connected to the bus 1. Current detection means (110) Current increase/decrease detection means (120) for bus 1 current
The current value and its increase/decrease are detected via the bus current detection delay means (130) (303). Next, an increase or decrease in the current value of the bus 1 is determined using the results obtained using the above-described means (304). If the current value of bus 1 increases, it can be determined that the air conditioner 1 (191) is connected to bus 1 (305). If the current value of bus 1 does not increase, it can be determined that the air conditioner 1 (191) is not connected to bus 1 (306). Furthermore, the bus 2 current is detected to determine whether or not it is connected to the bus 2.

The bus 2 current is detected through the current detection means (110), the current increase/decrease detection means (120), and the bus current detection delay means (130).
The current value and its increase/decrease are detected (307). Next, an increase or decrease in the current value of the bus l is determined using the results obtained using the above-described means (308). If the current value of the bus 2 increases, it can be determined that the air conditioner 1 (191) is connected to the bus 2 (309). If the current value of bus 2 does not increase, the relevant air conditioner 1 (191)
can be determined to be not connected to bus 1 (310).

Finally, the air conditioner 1 (191) is stopped by outputting a stop signal to the air conditioner operation/stop means (160) (311). This is because when the compressor is turned on or off by the air conditioner itself, it affects the bus current change, so it is necessary to stop the air conditioner to eliminate the effect on the bus current change. It is processing. Connection determination processing for air conditioner 2 (2
05) and connection determination processing for the air conditioner 3 (206
) is completely the same as the connection determination process (204) for the air conditioner 1, so the explanation will be omitted.

Effects of the Invention As described above, according to the present invention, with a simple configuration, the connection state of each air conditioner to the power system can be determined completely automatically by detecting the bus current and determining its increase/decrease.

Furthermore, by performing the determination process for each air conditioner, it is possible to eliminate the cause of erroneous determination of the power system connection state by eliminating the influence on bus current changes.

[Brief explanation of drawings]

This is a flowchart. 111, +12...CT (current transformer), 11
3.114...Amplifier 171...Bus 1.172...
Bus bar 2, 120...Current increase/decrease detection method 130...Bus bar current detection delay method 140...Current system connection determination means,
150...Method for stopping all air conditioners 160...Means for operating/stopping air conditioners, 191...Air conditioner 1, 192...
Air conditioner 2.193... Air conditioner 3°

Claims (4)

[Claims] (1) At least two or more air conditioners are connected to a single-phase three-wire power supply line, and the current used to detect the current in two bus wires excluding the neutral point of the single-phase three-wire power supply line a detection means, a current increase/decrease detecting means for detecting an increase/decrease in the output signal of the current detecting means, and a signal from the current increase/decrease detecting means;
A power system connection determining device for an air conditioner, comprising power system connection determining means for determining a connection state of the air conditioner to the single-phase three-wire power supply line. (2) A claim in which at least two or more air conditioners are connected to a single-phase three-wire power supply line, and the air conditioner has air conditioner operation/stop means for operating or stopping all or part of the air conditioners. Item 1. The power system connection determination device for an air conditioner according to item 1. (3) At least two or more air conditioners are connected to the single-phase three-wire power supply line, and further includes an all-air conditioner stopping means for temporarily stopping all of the air conditioners in operation. 3. A power system connection determination device for an air conditioner according to 1 or 2. (4) At least two or more air conditioners are connected to a single-phase three-wire power supply line, and the current for detecting the current in two bus wires excluding the neutral point of the single-phase three-wire power supply line Claim 1, further comprising a detection means and a bus current detection delay means for detecting the bus current after a predetermined time from the start of operation of the air conditioner.
4. The power system connection determination device for an air conditioner according to any one of 2 and 3.