JPS635974B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a circuit for preventing simultaneous operation of remotely monitored and controlled electrical equipment, and in particular, to prevent a circuit from operating due to an erroneous signal when a plurality of electrical equipment such as disconnectors are remotely monitored and controlled. This invention relates to a circuit for preventing the simultaneous operation of electrical equipment, which prevents a large number of devices, including devices that are not allowed, from operating at the same time.

Figure 1 shows the connection relationship between a disconnector DS and a grounding device ES as electrical equipment that is remotely monitored and controlled.
Electrically and mechanically interlocked.
Therefore, the disconnector DS and the earthing device ES are "closed" at the same time.
This prevents a short circuit from occurring.

However, when both the disconnector DS and the earthing device ES are in the "closed" state, there is a state in the sequence in which it is okay for both to be closed, and if such simultaneous closing signals are generated, a short circuit will occur. This could cause an accident. Further, it has been extremely difficult to create an interlock device that includes a structure for preventing short circuit accidents due to the distance between the disconnector and the grounding device.

Further, such simultaneous operation similarly causes an undesirable situation when tripping electrical equipment such as the disconnector DS and the grounding device ES.

Therefore, the purpose of the present invention is to electrically prevent simultaneous operation of remotely monitored and controlled electrical equipment, and as a technical means to achieve this objective, the present invention prevents simultaneous operations of remotely monitored and controlled electrical equipment. The circuit is
A circuit for preventing simultaneous operation of a plurality of remotely monitored and controlled electric devices each operated by a self-holding circuit formed by inputting an operation signal, the parallel circuit having one less self-holding relay than the plurality of devices. and one less than the plurality of interlocks which are connected in series with the series circuit consisting of the normally open contacts of the self-holding relays and interlocked in a complementary manner with the self-holding relays of each of the other electrical devices. A series circuit consisting of a parallel circuit of the interlock relay, and the normally closed contacts of at least one interlock relay of the interlock relays of each of the other electrical devices, which are connected in series to the parallel circuit of the interlock relay. The normally open contacts of the interlock relay are connected in series with each other, and are also connected in series with the parallel circuit of the self-holding relay and the series circuit of the normally open contacts of the self-holding relay, A series circuit consisting of a parallel circuit of the interlock relay and a normally closed contact of the interlock relay of each of the other electrical devices is a series circuit consisting of the normally open contact of the interlock relay and the self-holding relay. A configuration characterized in that each of the electric devices is connected in parallel to a series circuit of a parallel circuit of the self-holding relay and a series circuit of the normally open contacts of the self-holding relay to input the operation signal, and further that each of the electric devices is connected in series with a series circuit of normally open contacts of the self-holding relay. have. In a preferred embodiment, the electrical equipment includes a disconnector and a grounding device.

Hereinafter, the present invention will be explained in detail along with preferred embodiments of the present invention.

Figure 2 is a sequence circuit diagram showing one embodiment of the present invention, in which 1 is a disconnector DS as an electrical device.
2 is a block diagram showing the sequence circuit of the grounding device ES as an electrical device.
In this case, block 1 may be a sequence circuit of the earthing device ES, block 2 may be a sequence circuit of the disconnector DS, and both sequence circuits 1 and 2 may be sequence circuits of the disconnector DS or the earthing device ES, as shown in FIG. is just an example.

C ₁ and C ₂ are sequence circuits 1 and 2 respectively
The self-holding relays _A2 and _A1 are interlock relays for sequence circuits 1 and 2, respectively. The normally open contact _{A 2a} of the relay A ₂ is connected in series to the relay C 1, and the normally open contact C _1a1 of the relay C ₁ is also connected in series to form a circuit between the positive and negative power supplies. Similarly, the normally open contact _{A 1a} of the relay A ₁ is connected in series to the relay C 2, and the normally open contact C _2a1 of the relay C ₂ is also connected in series to form a circuit between the positive and negative power sources.

Relay C ₁ and relay A ₁ are complementary interlocked as described below, and relay C ₂ and relay
A ₂ is similarly interlocked. Therefore, the normally closed contact A _1b of the relay A ₁ is connected in series to the relay A ₂ . And this series circuit and relay
A series circuit of C ₁ and normally open contact A _2a is connected in parallel. This parallel circuit has a disconnector from terminal 3.
The input signal for DS is input. Similarly, relay
Normally closed contact A _2b of relay A ₂ is connected in series to A ₁ ,
This series circuit is connected in parallel to the series circuit of relay C ₂ and normally open contact A _1a . A closing signal for the earthing device ES is input to this parallel circuit.

Another normally open contact C _1a2 of the relay C ₁ and another normally open contact C _2a2 of the relay C ₂ are connected in series between the sequence circuits 1 and 2 and the power supply, respectively.

Incidentally, a trip signal can also be input separately to the sequence circuits 1 and 2.

Next, we will discuss the interlock configuration between relays, which is necessary to explain the sequence operation in Figure 2.
This will be explained using Figures a and b.

FIG _{. 3a shows the interlock relationship in the non-energized state of relays C 1 and A 1 in FIG} . ₁ and
The contacts of A ₁ (e.g. C _1a1 and A _1a ) are shown. Nao 3
5 is a lever, and 36 is a jig.

FIG. 3b shows a state in which the coil 32 of relay _A1 is energized and the contacts 34 are attracted; in this case,
Since the contact 33 of the relay _C1 is locked by the lever 35, it cannot be closed even if the coil 31 is energized. Such mechanical interlock relays can be assembled in one place, and are generally used in circuits using electric motors, and are used as relays for forward and reverse rotation.

The operation of the sequence circuit shown in FIG. 2 will be explained with reference to FIG.

Now, if a signal is input from terminal 3 to turn on disconnector DS, relay A ₂ is energized via normally closed contact A _1b , which closes normally open contact A _2a in series with relay C ₂ . Therefore, relay C ₁ is energized and its normally open contact C _1a1 is closed, so that relay C ₁ performs a self-holding function. This activates the sequence circuit 1 via the normally open contact C _1a2 and closes the disconnector DS.

At this time, relay C ₁ and A ₂ are each relay
Since A ₁ and C ₂ are interlocked, even if a closing signal is input from terminal 4 at the same time as a closing signal from terminal 3, relay A ₁ is only energized as shown in Figure 3b, and its normally open contact is A _1a cannot be closed and therefore relay C ₂ cannot be energized.
This indicates that sequence circuits 1 and 2 cannot operate at the same time, and that the disconnector DS and the grounding device ES cannot be turned on at the same time. terminal 4 from terminal 3
The same applies to the reverse case where the input signal is input to both.

Furthermore, when the closing signals are input to terminals 3 and 4 at the same time, relays A ₂ and A ₁ are only energized and mechanically interlock relays C ₂ and C ₁ , respectively _. and C ₁ are not self-holding, so the disconnector DS and the earthing device ES are not closed together, which can avoid a dangerous short-circuit condition.

FIG. 4 shows an example of a circuit for preventing simultaneous operation when an electrical device is equipped with, for example, three disconnectors, and the three disconnectors A, B, and C are operated by sequence circuits 41, 42, and 43, respectively. be done. These sequence circuits 41, 42, and 4
3 performs the closing operation in response to closing signals inputted to terminals 44, 45, and 46, respectively.

In the case of Fig. 4, the number of all disconnectors minus 1, that is, two relays, are connected to each disconnector for self-holding relays (for example, C ₁ , C ₁₁ and interlock relays). The relays (e.g. A ₂ , A ₃ ) are used respectively and connected in parallel.The parallel circuit of the self-holding relay includes the normally open contacts of the interlock relay (e.g. A _2a , A _3a ).
The series circuit of the normally open contacts of the self-holding relay (for example, C _1a , C _11a1 ) are connected in series, and the interlock relay has each of the other disconnectors (B and C) connected in series. A series circuit of normally closed contacts (for example, A _1b , A _11b ) of an interlock relay is connected in series, and this series circuit (A _1b , A _11b - relay
A series circuit (A _2a , A _3a - relay C ₁ , C ₁₁ ) is connected _in parallel with the parallel circuit of the self _- holding relay and the series circuit of the normally open contact of the interlock relay. ing. A series circuit of normally open contacts (for example, C _1a2 , C _11a2 ) of each self-holding relay is connected in series with a sequence circuit (for example, 41) between the power supplies.

The interlock relationship in Figure 4 is the relay
C ₁ and A ₁ , Relay C ₂ and A ₂ , Relay C ₃ and A ₃ , Relay
C ₁₁ and A ₁₁ , relay C ₂₂ and A ₂₂ , and relay C ₃₃ and
A ₃₃ , located between.

With such a sequence configuration, the operation in FIG. 4 can also exhibit the same simultaneous operation prevention function as in FIG. 2.

In the above explanation, the case of the input signal has been described, but it is obvious that the same can be applied to the trip signal.

As described above, by adopting the sequence circuit configuration according to the present invention, it is possible to prevent undesirable simultaneous operations even when a large number of electrical devices are remotely controlled, and also to prevent erroneous operation signals caused by remote control. Since it is not affected by input, it has the effect of providing extremely reliable circuit operation.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram illustrating the arrangement relationship of a disconnector and a grounding device; Fig. 2 is a diagram showing a simultaneous operation prevention circuit when two electrical devices, a disconnector and a grounding device, are used in the present invention; 3a and 3b are diagrams illustrating an interlock mechanism between two relays, and FIG. 4 is a diagram illustrating a simultaneous operation prevention circuit when two disconnectors are used in the present invention. DS...disconnector, ES...grounding device, _C1 , _C2 , _C3 ,
C ₁₁ , C ₂₂ , C ₃₃ ...Self-holding relay, A ₁ , A ₂ , A ₃ ,
A ₁₁ , A ₂₂ , A ₃₃ ...Interlock relay,
C _1a1 , C _1a2 , C _2a1 , C _2a2 , C _3a1 , C _3a2 , C _11a1 ,
C _11a2 , C _22a1 , C _22a2 , C _33a1 , C _33a2 , A _1a , A _2a ,
A _3a , A _11a , A _22a , A _33a ...Normally open contact, A _1b , A _2b ,
A _3b , A _11b , A _22b , A _33b ...Normally closed contact, 1, 2, 4
1-43...Sequence circuit, 3, 4, 44-46
...Input terminal. In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Scope of Claims] 1. A simultaneous operation prevention circuit for a plurality of remotely monitored and controlled electric devices each operated by a self-holding circuit formed by inputting an operation signal, the circuit being one less than the plurality of devices. The plurality of self-holding relays are connected in series with a parallel circuit of self-holding relays and a series circuit consisting of normally open contacts of the self-holding relays, and interlocked in a complementary manner with the self-holding relays of other electrical devices. A parallel circuit of one less than one interlock relay is connected in series to the parallel circuit of interlock relays, and a normal state of at least one interlock relay of the interlock relays of each of the other electric devices is connected in series to the parallel circuit of the interlock relays. and a series circuit consisting of closed contacts, and the normally open contacts of the interlock relay are connected in series with each other, and a parallel circuit of the self-holding relay and a series circuit of the normally open contacts of the self-holding relay. A series circuit consisting of a parallel circuit of the interlock relay and a normally closed contact of the interlock relay of each of the other electric devices is connected in series, and a series circuit consisting of the normally open contact of the interlock relay of each of the other electrical devices is connected in series. The circuit and the parallel circuit of the self-holding relay are connected in parallel to input the operation signal, and each of the electric devices is connected in series with the series circuit of the normally open contacts of the self-holding relay. A circuit for preventing simultaneous operation of remotely monitored and controlled electrical equipment. 2. Simultaneous operation prevention circuit for remotely monitored and controlled electrical equipment according to claim 1, wherein the electrical equipment is a disconnector or a grounding device.