JPS59181937A - Simultaneous operation preventing circuit of remote monitor control type electric device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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 a disconnector D as an electrical device that is remotely monitored and controlled.
The connection relationship between the disconnector DS and the earthing device ES is shown, and the disconnector DS and the earthing device ES are normally electrically and mechanically interlocked. Therefore, the disconnector DS
This prevents the grounding device ES and the grounding device ES from being in the "closed" state at the same time, ie, the V=circuited state.

However, both the disconnector DS and the grounding device Es are "open".
In this state, there is a state in the sequence in which it is acceptable for both to be closed, that is, to be closed, and if such simultaneous closing signals were generated, a short circuit accident could occur. Furthermore, it is 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.

Furthermore, such simultaneous operation can be performed by disconnecting switch DS and grounding device E.
A similar unrealistic situation occurs when tripping an electrical device such as S.

Therefore, an object of the present invention is to electrically prevent simultaneous operation of remotely monitored and controlled electrical equipment, and as a technical means to achieve the objective, the present invention provides prevention of simultaneous operations of remotely monitored 11il 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; a parallel circuit of relays; the plurality of relays are connected in series with 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; )/parallel circuit of interlock relays connected in series to the parallel circuit of the interlock relays, and at least one of the interlock relays of each other electrical device 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. and a series circuit consisting of a parallel circuit of the interlock relay and a normally closed contact of an interlock relay of each of the other electrical devices, the series circuit consisting of a normally open contact of the interlock relay. Each of the electric devices is connected in parallel to a series circuit of a series circuit and a parallel circuit of the self-holding relay to input the operation signal, and each of the electric devices is connected in series with a series circuit of normally open contacts of the self-holding relay. It has a configuration characterized by:

In a preferred embodiment, the electrical equipment includes a disconnector and a grounding device.

The present invention will now be described in detail with reference to preferred embodiments thereof.

FIG. 2 is a sequence circuit diagram showing an embodiment of the present invention.
In the figure, l indicates a sequence circuit of a disconnector DS as an electrical device, and c indicates a sequence circuit of a contact device RES as an electrical device.

In this case, the block / may be a sequence circuit of the earthing device Es, and the block co may be a sequence circuit of the new circuit DS.
Or it may be a sequence circuit of the grounding device Es, and the second
The figure is just an example.

C1 and C2 are self-holding relays for sequence circuits l and -, respectively; A2 and A are sequence circuits /
and - interlock relays. Relay C1
The normally open contact A2a of the relay A2 is connected in series with the normally open contact A2a of the relay C1, and the normally open contact C+a+ of the relay C1 is also connected in series to form a circuit between the positive and negative power sources. Similarly, normally open contacts A and a of relay 8 are connected in series to relay 02, and normally open contact C24 of relay C2 is also connected in series to form a circuit between positive and negative power sources.

Relay C1 and relay A1 are interlocked in a complementary manner as described later, and relay C2 and relay 8 are also interlocked in the same way. Therefore, normally closed contacts A+b of relay A are connected in series to relay A2. This series circuit and the series circuit of relay C1 and normally open contact A21L are connected in parallel. A closing signal for the disconnector DS is input from the terminal 3 to this parallel circuit. Similarly, the normally closed contact A2b of relay A2 is connected in series to relay A, and this series circuit is connected in parallel to the same series circuit of relay C2 and normally open contact A11. A closing signal for the earthing device ES is input to this parallel circuit.

Another normally open contact CI&2 of relay C1 and relay C2
Another normally open contact C2,2 of the sequence circuit l
and is connected in series between the unit and the power supply.

Incidentally, a trip signal can also be input separately to the sequence circuits 1 and 7.

Next, in order to explain the sequence operation in Fig. 2, we will explain the interlocking between necessary relays in Figs. 3(a) and ().
This will be explained using b).

FIG. 3(a) shows the interlock relationship in the non-energized state of relays C1 and 8 in FIG. 1, and 3/ and 3.2 are relays C4 and A, respectively.

coils 33 and 3 are relays C5 and A, respectively.
(for example, "jal" and "A+a").

gl 3k is a lever, and 36 is a jig.

FIG. 3(b) shows a state in which the coil 32 of relay A is excited and the contact 3II is attracted; in this case, relay C
Since the contact 33 of No. 1 is locked by the lever 3S,
Even if the coil 31 is excited, the closing operation cannot be performed. Such mechanical interlock relays can be grouped together 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 J to turn on disconnector DS, it will be sent to the normally closed contact via relay A2 through b.
is energized and closes the normally open contact A2a in series with relay C2, so relay C4 is energized and its normally open contacts C1&1 are closed, so that relay C1 performs a self-holding function. This activates the sequence circuit 1 via the normally open contact C1, closing the disconnector 1).

At this time, relays C1 and A2 interlock relays A and C2, respectively, so even if a closing signal is input from the terminal at the same time as the 4-wire 30 closing signal, as shown in Fig. 3(b).
As shown in FIG. 2, relay A is only energized, but its normally open contacts A and a cannot be closed, so relay C2 is not energized.

This indicates that the sequence circuits 1 and - do not operate at the same time, and that the disconnector DS and the grounding device ES cannot be turned on at the same time. The same applies to the reverse case where the closing signal is input from terminal 3 to terminal 4t.

In addition, when the closing signal is input to terminal 3 and terminal 3 at the same time, relays A2 and A are only energized and mechanically interlock relays C2 and C1, respectively, so relays C2 and C1 are self-contained. is not held, so that the disconnector DS and the grounding device BS are not closed together and a dangerous short-circuit condition can be avoided.

Figure 9 is! This example shows a circuit for preventing simultaneous operation when equipped with three disconnectors, for example, three disconnectors (A).
l (B) and (C) are respectively sequence circuits lI
/, Fco, and G3.

And these sequence circuits #/, 9J, and 3
perform the closing operation in response to closing signals input to terminals 47F, <(j, and II6, respectively).

In the case of Figure 1, the number of all disconnectors minus l, that is, two relays, are connected to each disconnector by self-holding relays (e.g. C+ + C+ + and interlock relay). (for example, 821A3), and they are connected in parallel.

The parallel circuit of the self-holding relay includes a series circuit of the normally open contacts of the interlock relay (e.g. 8.1°Aga) and a normally open contact of the self-holding relay (e.g. C+
a + C1, a, ) are connected in series, and the interlock relay is connected to another disconnector (B
The series circuits of normally closed contacts (e.g. 8, b, 81.b) of each interlock relay and C) are connected in series, and this series circuit @(to+b+A++b-relay A,,,A
, ) is a series circuit (A2a
+85a-relay C5°C11) are connected in parallel. and separate normally open contacts of the self-holding relays (
For example, a series circuit of C4a2#CIja2) is connected in series with a sequence circuit (for example, +77) between the power supplies.

The interlock relationship in FIG. 9 is that relays C7 and A
4, Su L/-C2 and A2, Su L/-C5 and A3, Su L/
-C, and Al1, relays c22 and A22, and relays C3 and A55.

With such a sequence configuration, the operation in FIG. 9 can also exhibit the same simultaneous operation prevention function as in FIG. 1.

In addition, although the above explanation was made regarding the case of the input signal, it is clear that the same can be applied to the trip signal as well.

As shown 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 to prevent erroneous operation signals caused by remote control. Since it is not affected by this even if it is used for a long time, 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, and FIG. 3(a) and 3(b) are diagrams illustrating an interlock mechanism between two relays, and FIG. 3 is a diagram illustrating a simultaneous operation prevention circuit when three disconnectors are used in the present invention, It is. DS--disconnector, E8--grounding device, C,, C2°C5
1C7l l C22P C33...Self-holding relay,
AI I A2 1 A51 A, 11 A221
A33・-1 no for interlock, cI&+ #
cja2 # c2al 102a2 1
CAal l C1a2 #Cl1al
l CLla2 02! aj 'C22a2
#C! 15al l C55a21 A lat A
2a e k3a98Ila l A22a +
A33a... Normally open contact, A4. . A2btA3111Ajibs 822bl A-55
b''' Normally closed contact, /, l, 'I/, -3, φ sequence circuit, 3゜g, gtl-g6...Input terminal. In each figure, the same symbols are the same or equivalent. agent part
Shin Kuzuno- 1 figure 3-mo 2 figure 228 Figure 3 (0) Negative Hiki (b) Cl A+

Claims (1)

[Claims] (11) A simultaneous operation prevention circuit for a plurality of remote monitoring and control type electrical equipment each operated by a single holding circuit formed by inputting an operation signal; one self-holding relay less than the plurality of above-mentioned self-holding relays. a parallel circuit of the self-holding relays; and a parallel circuit of the plurality of self-holding relays connected in series with a series circuit consisting of the normally open contacts of the self-holding relays, and complementary interlocking with the self-holding relays of the other electric devices. A parallel circuit of a small number of interlock relays; connected in series to the parallel circuit of interlock relays, and the normally closed contacts of at least one interlock relay of the interlock relays of each of the other electrical devices. a series circuit consisting of; the normally open contacts of the interlock relay are connected in series with each other, and the normally open contacts of the interlock relay are 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. and a series circuit consisting of the parallel circuit of the interlock relay and the normally closed contact force 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. The circuit and the parallel circuit of the self-holding relay are connected in parallel to a series circuit to input the operation signal, and each of the electrical devices further includes:
8. A simultaneous operation prevention circuit for a remotely monitored and controlled electric appliance as set forth in claim 7, characterized in that the circuit is connected in series with a series circuit of normally open contacts of the self-holding relay.