JPS6220767B2 - - Google Patents

Description

[Detailed description of the invention] The present invention detects the load current of a motor etc. with a current transformer, detects the ground current with a zero-phase current transformer, detects overvoltage and undervoltage with an auxiliary transformer, and detects the ground current with a zero-phase current transformer. This invention relates to an improvement in a circuit breaker that turns off the circuit breaker in the event of an abnormality via a control circuit for disconnection.

FIG. 1 shows the configuration of a conventional circuit breaker. In FIG. load 3
A closed circuit is formed through the Overcurrent in the main circuit is detected by the transformer 6, ground fault current is detected by the zero-phase current transformer 7, overvoltage and undervoltage in the main circuit are detected by the auxiliary transformer 8, and the control circuit 4
is supplied to. The secondary current of the current transformer 6 is converted into a voltage signal by the resistor 10 and sent to the control circuit 4.
is supplied to. In the event of an overcurrent, ground fault current, overvoltage, or undervoltage failure in the main circuit, it is determined by the control circuit 4 that the transistor 12 is switched on, the tripping coil 5 is energized, and the cover of the breaker 2 is removed. I have decided to turn off the disconnector.

At this time, the display 11 indicates 11-1 when the long-time trip characteristic is activated, 11-2 when the short-time trip characteristic is activated, 11-3 when the instantaneous trip characteristic is activated, and 11-3 when the earth fault trip characteristic is activated. The time is 11-
4. Undervoltage trip characteristics: 11-5 when operating;
and overvoltage trip characteristics during operation of 11-6,
Each is displayed by a light emitting diode or lamp. When the breaker 2 is turned off, there is no control power supply, so power is supplied to the control circuit 4 from an uninterruptible control power supply consisting of a storage battery 14 and a DC-DC converter 13. However, as the number of displays increases, the control power supply becomes larger, the capacity of the DC-DC converter also increases, and the display circuit requires a large current capacity to cope with failures. Moreover, its capacity is larger than the current value normally supplied to the control circuit, which has the disadvantage that the circuit and disconnection become larger, and at the same time the semiconductor circuit and display circuit portion become larger, and that a large control current is required. There is. Furthermore, there is a strong demand for circuits and disconnectors to be more compact, and as the number of display devices increases, the space required increases accordingly, which inevitably becomes a major obstacle. Furthermore, the more content is displayed, the more maintenance it takes.
Although it is easy to inspect, there is a paradox in that it is not possible due to the limitations of compactness.
On the other hand, if the number of display devices is increased to make maintenance and inspection easier, the control power supply will also increase, which is a contradictory problem that will not result in energy savings. and,
These requirements are extremely contradictory and have become a major obstacle.

The present invention was made to solve the above-mentioned problems, and its purpose is to be able to semi-permanently save the failure display contents even if the main circuit or disconnector is turned off, and also to allow maintenance and inspection to be carried out. To provide a compact and economical circuit and disconnector that can easily obtain a lot of information.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 shows an example of the circuit configuration of a circuit breaker according to the present invention, and the same parts as in FIG. 1 are denoted by the same reference numerals. In the figure, reference numeral 1 denotes a power supply which supplies power to a load 3 such as an electric motor via a disconnector main circuit 2. 6 is a current transformer for detecting the load current of the main circuit, 7 is a zero-sequence current transformer for detecting the zero-sequence current of the main circuit, and 8 is an auxiliary transformer for detecting the voltage of the main circuit. Further, 14 is connected to the secondary side of the current transformer 6, and diodes 14-1 to 14-1 are connected to the secondary side of the current transformer 6.
A single-phase full-wave rectifier 14 is constructed of 14 to 4. A constant voltage diode 15 and a resistor 10 are connected in series to the secondary terminal of the single-phase full-wave rectifier 14 to form a closed circuit. Furthermore, 2 of this single-phase full-wave rectifier 14
A non-linear surge absorbing element 9 is connected in parallel to the next terminal to absorb overvoltage on the secondary side of the current transformer 6. On the other hand, 13 is the single-phase full-wave rectifier 14
When the secondary terminal output of is input, the power supply circuit applies the output to the control circuit 4' as its control power. This control circuit 4' introduces the secondary output of the current transformer 6, the secondary output of the zero-phase current transformer 7, and the secondary output of the auxiliary transformer 8, which are converted into voltage signals by the resistor 10. The abnormality of the main circuit is determined based on these input signals, and when an abnormality is determined, the output is tripped and sent as a gate signal to the thyristor 12 connected to the main control circuit 4' via the coil 5 in series. The circuit is configured so that the tripping coil 5 is energized, and the catch of the main circuit 2 of the breaker is released to turn off the breaker. At the same time, the details of the cause of the failure as a result of the abnormality determination are stored in a memory pack 11 serving as a display connected to the main control circuit 4' by a connector system. This memory pack 11 is for storing the cause of failure in a non-volatile memory, in which display contents can be stored in advance in the most preferable form not only in alphanumeric characters but also in numerical values and other combinations. That is, in the characteristics of the circuit disconnection operating time T with respect to the main circuit current I as shown in FIG. 3 as a result of the above abnormality determination, when the long time tripping characteristic shown in A is activated, the electrical connection 11-1 is , electrical connection 11-2 when operating the short-time trip characteristic shown in B, electrical connection 11-3 when operating the instantaneous trip characteristic shown in C, and electrical connection 11-3 when operating the ground fault characteristic shown in D. The contents are stored in the memory pack 11 via the respective connections. Also, the fourth
In the characteristics of the circuit disconnection operating time T with respect to the main circuit voltage V as shown in the figure, the electrical connection 11-5 is connected when the undervoltage tripping characteristic shown in E is activated, and when the overvoltage tripping characteristic is activated as shown in F. The contents thereof are stored in the memory pack 11 via the respective electrical connections 11-6. In addition,
Reference numeral 11-7 indicates an electrical connection of a power supply line.

Next, in this configuration, power is supplied to the load 3 via the power source 1 and the disconnection main circuit 2. In such a state, the load current flowing in the main circuit is detected by the current transformer 6, and the second
The next current flows from the single-phase full-wave rectifier 14 through the constant voltage diode 15 to the resistor 10 and is applied to the current circuit 13. As a result, the secondary current of the current transformer 6 is converted into a voltage signal by the resistor 10 and introduced into the control circuit 4', and the output of the power supply circuit 13 is applied to the control circuit 4' as its control power source. . On the other hand, the zero-sequence current of the main circuit is connected to the zero-sequence current transformer 7.
Similarly, the voltages thereof are respectively detected by the auxiliary transformers 8, and their respective secondary outputs are respectively introduced into the control circuit 4'. If an abnormality occurs on the load 3 side in this state, the load current (overcurrent) in the main circuit will be transferred by the current transformer 6, and the ground fault current will be transferred by the zero-phase current transformer 7. , overvoltage and undervoltage are detected by the auxiliary transformer 8 and introduced into the control circuit 4', where abnormality determination is made. As a result, for example, when the long time trip characteristic A shown in Fig. 3 is activated, the output (trip command) of the thyristor 1 is
2 as its gate signal. As a result, the thyristor 12 is turned on, and its control power is supplied from the control circuit 4' to the tripping coil 5 as its excitation power, and each is energized to release the catch and open the breaker main circuit 2. Also,
At the same time, the cause of the failure (long time trip) is stored in the memory pack 11 from the control circuit 4' via the electrical connection 11-1. Also,
In the above, when the short-time tripping characteristic B operates, the electrical connection 11-2 is used, when the instantaneous tripping characteristic C operates, the electrical connection 11-3 is used, and when the earth fault tripping characteristic D operates, the electrical connection 11 is used. -4, when the undervoltage tripping characteristic E is activated, the cause of the failure is stored in the memory pack 11 through the electrical connection 11-5, and when the overvoltage tripping characteristic F is activated, the cause of the failure is transmitted through the electrical connection 11-6.
is memorized. When the breaker main circuit 2 is opened by excitation of the tripping coil 5, the control power is no longer applied from the power supply circuit 13 to the control circuit 4', and the output from the control circuit 4' is Sending stops. However, in this circuit, the memory pack 1 stores the cause of the failure in non-volatile memory.
1, even if the circuit breaker main circuit 2 is turned off, the cause of the failure will be semi-permanently stored in the memory pack 11.

In this way, the load current is detected by the current transformer 6,
In addition, ground fault current is detected by the zero-phase current transformer 7, and overvoltage/undervoltage is detected by the auxiliary transformer 8. The circuit breaker which opens the main breaker circuit 2 is equipped with a memory pack 11 for storing the cause of failure in a non-volatile memory.

Therefore, unlike conventional circuit disconnectors, even if the circuit disconnector is turned off in the event of an abnormality, the details of the cause of the failure are semi-permanently stored in the memory pack 11, so that the control current of the control circuit 4' is This eliminates the need for a separate power source such as a storage battery DC-DC converter to hold the battery, and allows for a compact, inexpensive, and highly reliable circuit configuration. In addition, with conventional displays such as light emitting diodes, it was only possible to distinguish colors by simply lighting a lamp, but compared to these limited displays, it is possible to obtain a large amount of information with a significantly greater degree of freedom. This makes maintenance and inspection extremely easy. The memory pack 11 can be easily removed from the main body of the circuit breaker or disconnector, so it can be read anywhere by inserting it into a portable reading device without carrying the circuit breaker or disconnector. It also has the advantage of being able to perform

As described above, this circuit breaker is compact and can display more fault indications without taking up much space, and can perform various other monitoring functions. Conventional circuit breakers not only require a control power source, but also require a fairly large current capacity (approximately 100 mA just displayed), but this circuit cutter does not require this. An energy-saving type can be obtained. Further, unlike a simple lamp display, there is an advantage that maintenance and inspection can be easily achieved by inserting a detailed display into the reading device. Furthermore, this memory pack is semi-permanent and can be easily reused with an erasing device. on the other hand,
Traditionally by display elements. Some had 3 or 4 lamps, but this circuit and disconnector can handle any number of lamps, so standardization can be easily achieved. Furthermore, conventionally DC-
A DC converter was required, but this circuit has permanent memory, so it is portable and can be used to analyze failures anywhere.

It should be noted that the present invention is not limited to the above embodiments, but can also be implemented as follows.

(1) In the above embodiment, a non-volatile memory was used, but in the case of a volatile memory, for example, by storing a primary battery or a secondary voltage battery in the memory pack,
It is possible to obtain the same effect as non-volatile memory. In this case, since power is supplied from the battery, the memory pack itself can have a fault display function, and it is possible to display the cause of the trip when the circuit breaker has turned off. be.

(2) As shown in Fig. 5, the memory pack 11 is fixed and stored in a circuit or disconnector, and the jack of the reading device is inserted into the electrical connection terminal, so that it can be easily read. You can also use it as Further, in this case, the memory pack 11 is constructed so that it can be easily erased by pressing an erase button on the reading device.

In addition, the present invention can be modified and implemented in various ways without changing the gist thereof.

As explained above, according to the present invention, even if the main circuit or disconnector is turned off, the failure display contents can be saved semi-permanently, and a compact and economical system that can provide a lot of information that makes maintenance and inspection easy. We can provide highly reliable circuits and disconnectors.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing a conventional circuit breaker, Fig. 2 is a schematic configuration diagram showing an embodiment of the present invention, Figs. 3 and 4 are diagrams showing tripping characteristics, and Fig. 5 is FIG. 3 is a schematic configuration diagram showing another embodiment of the present invention. 1...Power supply, 2...Shin breaker main circuit, 3...Load, 4, 4'...Control circuit, 5...Tripping coil, 6...Current transformer, 7...Zero-phase current transformation 8...Auxiliary transformer, 9...Non-linear surge absorption element, 10...
...resistor, 11...memory pack, 12...thyristor, 13...power supply circuit, 14...single-phase full-wave rectifier, 15...constant voltage diode.

Claims (1)

[Claims] 1. Detects the amount of electricity in the main circuit of the breaker, determines a failure (abnormality) in the main circuit based on the detected amount of electricity, and sends a tripping command to disconnect the main circuit. In circuits and disconnectors that are designed to turn off
A circuit or disconnection device characterized by comprising a memory pack for storing the cause (contents) of the failure in a non-volatile memory. 2 The amount of electricity in the shiya breaker main circuit is detected, and based on the detected amount of electricity, a malfunction in the main circuit is determined, and a trip command is sent to turn off the shiya breaker in this circuit. A circuit switch or disconnector, characterized in that the circuit switch or disconnector is equipped with a memory pack containing a battery for storing the cause (contents) of the failure in a volatile memory.