JPH039496B2 - - Google Patents

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention uses one of a plurality of terminal control devices as a standby device, and the standby device includes a terminal control device of any one of the active devices. The present invention relates to a working/standby switching method for a terminal control device in which only one terminal is connected by a working/standby switching operation.

[Technology background and issues]

As shown in FIG. 1, in the conventional working/standby switching method of a terminal control device, each terminal TA ₁ , TA ₂ . . .
They are connected to the terminal control devices (current machines) TC ₁ , TC ₂ ... through the switching machines EC ₁ , EC ₂ , ..., respectively, and the common standby terminal control device (standby machine) TC _s is connected to the common crossover wire.
It is connected to each switching machine EC ₁ , EC ₂ , . . . via CL. For example, if a failure occurs in the working machine TC ₂ , the switching machine can be switched by the working/standby switching operation.
Switch EC ₂ to the crossover wire CL side. Then, only the terminal device TA ₂ will be connected to the common standby device TC _s via the crossover line CL.

When switching from a working machine to a common standby machine, there are two methods: manual operation and automatic switching. In either case, in order to protect the driving circuit and the receiving circuit, it is necessary to prevent a plurality of active machines from switching to one common standby machine.

However, when the switching operation is performed manually, there is a risk that a plurality of working machines may be connected to a standby machine, which results in a lack of quick response and the inconvenience of requiring human labor.

On the other hand, the automatic method uses a supervisory control device.
Switching control is performed by installing a SUP, etc., but this was unavoidable because the hardware and software would become complicated if there were a large number of terminal control devices.

[Purpose of the invention]

An object of the present invention is to use a simple configuration so that when the terminal control device of one failed working machine is connected to the spare machine by a working/standby switching operation to the terminal control device set as the spare machine, To provide a working/standby switching system for a terminal control device that never connects to a standby device even if another terminal control device performs a working/standby switching operation.

[Structure of the invention]

In order to achieve this objective, in the current/standby switching system of a terminal control device of the present invention, a plurality of terminal control devices including a standby device controlling the terminal, a switching device connected to the terminal control device, It has each external crossover wire that connects each switching machine in series, each switching drive circuit that operates each switching machine, and a first protection wire and a second protection wire that control the operation of each switching drive circuit. and the switching device connects a first internal crossover wire and a second internal crossover wire that are respectively connected to different external crossover wires, and connects the first and second internal crossover wires when not in operation, and when in operation. a first contact circuit that connects the terminal control device of the switching device to the first internal crossover wire; a first contact circuit that connects the terminal device to the terminal control device when it is not in operation; and a first contact circuit that connects the terminal device to the terminal control device when it is not in operation; and a second contact circuit connected to the first
operated by a first switching relay that performs switching operation by the contact circuit, a second switching relay and the first or second switching relay that performs switching operation by the second contact circuit, and a third switching relay that switches the first and second contact circuits to the active side, and when a failure occurs in the terminal control device currently in use, the terminal control device is connected to the standby terminal control device. By switching only the first switching relay in the switching machine, the standby terminal control device is connected in series with the external crossover wire that connects the other switching machines, and also connected to the terminal control device where the fault has occurred. The present invention is characterized in that the terminal control device in which the fault has occurred and the connected terminal are connected to the external crossover wire by the switching operation of only the second switching relay in the switching device.

[Embodiments of the invention]

An embodiment of the present invention will be described with reference to FIGS. 2 and 3.

FIG. 2 shows a block diagram of an embodiment of the present invention. In the figure, TC ₁ to TC _o are terminal control devices, EC ₁ to _{EC o} are switching devices, and TA ₂ to _{TA o} are terminal devices. , CL ₁ , CL ₂ , ... are external crossover wires, IL ₁₁ to _{IL 1o} are first internal crossover wires in each switching machine, IL ₂₁ to IL ₂ n
is the second internal crossover wire in each switching machine, e ₁₃₁ ~
e _o31 is a first contact circuit that is switched by a third switching relay EX ₁₃ to EX _o3 (see explanation in Fig. 3);
e ₁₃₂ ~ e _o32 is also the third switching relay EX ₁₃ ~ _{EX o3}
This is a second contact circuit that is switched by.

The first contact circuit connects the first and second internal crossover wires when inactive, and connects the first internal crossover wire to the terminal control device when driven by the third relay circuit.

The second contact circuit connects the terminal to the terminal control device when inactive, and connects the terminal driven by the third relay circuit to the second internal crossover wire.

FIG. 3 shows switching drive circuits ECD ₁ to _{ECD o} that perform the switching operation of each switching machine, and are provided in each terminal control device or each switching machine (not shown).

Although FIG. 3 shows the switching drive circuit ECD ₁ for the switching machine EC ₁ , its circuit configuration is common to the other switching drive circuits ECD ₂ to _{ECD o} .

In Figure 3, PC ₁₁ and PC ₁₂ are the first and second
protection relays, pc ₁₁₁ and pc ₁₁₂ are the first protection relays
PC ₁₁ contact, PC ₁₂₁ is the contact of second protection relay PC ₁₂ , D ₁ , D ₂ are diodes for preventing wraparound, l ₁ ,
l ₂ are first and second protection wires commonly connected to similar points in other switching drive circuits, EX ₁₁ , EX ₁₂ ,
EX ₁₃ is the first, second and third switching relay, ex ₁₁₁
~ex ₁₁₃ , ex ₁₂₁ ~ex ₁₂₃ are the contacts of the first and second switching relays, and e ₁₃₁ and e ₁₃₂ (see Figure 2) are the contacts of the third switching relay, especially the first and second contact circuits. It is called.

SW ₁ is the automatic/manual changeover switch, SW ₂ is the current/manual changeover switch.
A standby changeover switch, SW ₃ is a release switch, RD is a relay driver, EXD is a changeover discrimination circuit that detects a fault in the terminal control device and generates a working/standby changeover signal, B is a power line, and E is a ground.

Working/standby switching switch SW ₂ , release switch
SW ₃ is an instantaneous switch; when pressed, SW ₂ turns on and SW ₃ turns off instantly.

Furthermore, in each of the contacts shown in FIGS. 2 and 3, solid lines indicate connection relationships when not in operation, and dotted lines indicate connection relationships during operation.

Next, manual and automatic working/standby switching operations will be described, taking as an example the case where the leftmost terminal control device TC ₁ is used as a backup line. In cases where there is no particular risk of misunderstanding, explanations will be made using only symbols as appropriate.

(A) Manual switching between active and standby devices (a) Backup device connection operation This is an operation to make the leftmost terminal control device the standby device.

(a-1) Set the automatic/manual changeover switch _SW1 of each changeover drive circuit _ECD1 to _ECDo to the manual side.
The working/standby selector switch SW ₂ is in the OFF state, and the release switch SW ₃ is in the ON state.

(a-2) Press the active/standby switching switch SW ₂ of the terminal control device ECD ₁ , which will be the standby device, and turn on SW ₂ for a moment.

(a-3) Power line B → EX ₁₁ → pc ₁₁₁ → pc ₁₁₂
A current flows through the path →SW ₁ →SW ₂ →E, operating switching relay EX ₁₁ and turning on contacts ex ₁₁₁ to ex ₁₁₃ .

(a-4) The following operations are performed simultaneously.

(i) A current flows through the path of power line B → EX ₁₁ → ex ₁₁₁ → SW ₃ → E, and the first switching relay EX ₁₁ is held in the activated state even after SW ₂ is turned off.

(ii) A current flows through the path of power line B → PC ₁₁ → D ₁ → ex ₁₁₂ → E, activating the first protection relay PC ₁₁ , turning off contact PC ₁₁₁ and switching PC ₁₁₂ to the right side. Even if PC ₁₁₁ is turned off, the above (i)
Since EX ₁₁ is held, its operating state will continue to be maintained.

(iii) As a result of ex ₁₁₂ being turned on, the first protection wire l ₁
is grounded.

(iv) Current flows through the power line B → EX ₁₃ → ex ₁₁₃ → E and activates the third switching relay EX ₁₃ .

(a-5) The following operation is performed.

(i) According to (a-4)-(iii), when the first protection wire l ₁ is grounded, each terminal control device TC ₂ in use
~TC _o switching drive circuit ECD ₂ ~ _{ECD o} 's first protective relay (corresponding to PC ₁₁ , hereinafter referred to as ECD ₂₎
(denoted by the symbol ) is grounded through the diode D ₁ , so the first protection relay is all activated, turning off its contacts pc ₁₁₁ and switching its contacts pc ₁₁₂ to the right.

As a result, each switching drive circuit ECD ₂ of the current machine
～Working/standby switch in ECD _o
Even if SW ₂ is turned on, the first switching relay
EX ₁₁ does not work. Then, the second switching relay EX ₁₂ becomes operable by SW ₂ .

(ii) When the third switching relay EX ₁₃ of the switching drive circuit ECD ₁ is activated by (a-4)-(iv), the first and second contact circuits of the switching device EC ₁ are switched to the operating side (the dotted line side). ), the terminal control device TC ₁ is connected to the external crossover CL ₁ via the first internal crossover IL ₁₁ .

With the above backup device connection operation, the leftmost terminal control device TC ₁ connects each external crossover wire CL ₁ , CL ₂ , ..., each first and second internal crossover wire IL ₁₁ , IL ₁₂ , ... and each first The terminal control devices TC _{2 to TC o of} the current machine are connected to the respective terminals TA ₂ to _{TA o ,} Further, the first switching relays of each of the switching drive circuits ECD ₂ to ECD _o are all fixed in an inoperative state, and the second switching relays are enabled by the working/standby switching switch SW ₂ .

(b) Working/standby switching operation This is an operation for connecting the terminal control unit of the working machine in which a failure has occurred to the standby unit, and will be explained using the terminal control unit TC ₂ as an example. However, the switching drive circuit
The operation of ECD ₂ will be explained using the symbols of ECD ₁ in Figure 3.

(b-1) Press the active/standby selector switch SW ₂ of the switching drive circuit ECD ₂ , and turn SW ₂ on for a moment.

(b-2) Current flows through the next path, activating the second switching relay EX ₁₂ and turning on the contacts ex ₁₂₁ to ex ₁₂₃ .

Power line B → EX ₁₂ → pc ₁₂₁ → pc ₁₁₂ → SW ₁
→SW ₂ →E (b-3) The following operations are performed simultaneously.

(i) A current flows through the power line B → EX ₁₂ → ex ₁₂₁ → SW ₃ → E, and the second switching relay EX ₁₂ is held in the activated state even after SW ₂ is turned off.

(ii) Current flows through the power line B → PC ₁₂ → D ₂ → ex ₁₂₂ → E, activating the second protection relay PC ₁₂ and turning off the contact pc ₁₂₁ . Even if the PC ₁₂₁ is turned off, the EX ₁₂ is held in accordance with (i) above, so its operating state will continue to be maintained.

(iii) As a result of ex ₁₂₂ being turned on, the second protection wire l ₂
is grounded.

(iv) Current flows through the power line B → EX ₁₃ → ex ₁₂₃ → E, operating EX ₁₃ .

(b-4) The following operation is performed.

(i) When the second protection wire l ₂ is grounded according to (b-3)-(iii), the other terminal control device TC ₃ in use
Since the second protection relay PC ₁₂ in the switching drive circuit ECD ₃ of ~TC _o is grounded via _the diode D ₂ , the second protection relays are all activated and turn off their contacts pc ₁₂₁ .

As a result, each of the other switching drive circuits in the current machine
Even if the working/standby changeover switch SW ₂ is turned on at ECD ₃ to ECD _o , the second changeover relay
EX ₁₂ does not work. Therefore, the third switching relay EX ₁₃ also does not operate, so the switching machine
EC ₃ to EC _o also do not operate, and none of the terminals TA ₃ to TA _o are connected to the standby device.

(ii) When the third switching relay EX ₁₃ of the switching drive circuit ECD ₂ is activated by (b-3)-(iv), the first and second contact circuits of the switching device EC ₂ are switched to the operating side (the dotted line side). ), the terminal TA ₂
is connected to the external crossover via the second internal crossover IL ₂₂ .
Connected to CL ₁ and further connected to standby machine TC ₁ .

On the other hand, since the second contact circuit e ₂₃₁ is turned off, the common crossover section on the right side is disconnected from the standby unit, preventing terminals other than terminal TA ₂ from being connected to standby unit TC ₁ . prevent.

When the above-mentioned backup device connection operation and working/standby switching operation are completed, only the backup device TC ₁ is connected to the common crossover wire, and the terminal device TA ₂ of the failed working device is connected.
only the standby unit is connected to the standby unit via a common crossover wire.

And other current terminals TA ₃ ~ _{TA o} are
Even if the working/standby switching switch SW ₂ in these switching drive circuits ECD ₃ to ECD _o is pressed, the first and second switching relays EX ₁₁ and EX ₁₂ do not operate, and therefore the third switching relay EX does not operate. ₁₃ does not work, other current terminals TA ₃ ~
By separating the internal and external crossover wires connected to TA _o from the common crossover wire of the standby machine, it is reliably prevented from accidentally connecting to the standby machine.

(B) Automatic working/standby switching operation Same as manual switching operation, the leftmost terminal control device TC ₁
An example will be explained in which the terminal TA 2 is connected to the backup device TC ₁ , assuming that the terminal TA ₂ is connected to the backup device TC ₁ and TC 2 has a failure.

(a) Backup unit connection operation Set the automatic/manual changeover switch SW ₁ in the switching drive circuit ECD ₁ of TC ₁ , which will be the standby unit, to the manual side.
Switching drive circuit ECD ₂ to ECD _o SW ₁ of other current machines
Switch to automatic mode. Therefore, since ECD ₁ is the same as in the manual case, the subsequent backup device connection operations are exactly the same as (a-2) to (a-5) in the manual case.

(b) Working/standby switching operation In the manual case, working/standby switching switch SW ₂ in the switching drive circuit ECD ₂ of the terminal control device where the failure occurred was temporarily turned on, but in the automatic case, the terminal control If a failure occurs in the device, for example, the control signal will no longer be generated.

The switching determination circuit EXD detects the disappearance of the control signal, generates a switching signal, and drives the relay driver RD. As a result, as in manual (b-2), the current in the next path flows, activating the second switching relay EX ₁₂ and turning on the contacts ex ₁₂₁ to ex ₁₂₃ .

Power line B → EX ₁₂ → p ₁₂₁ → pc ₁₁₂ → SW ₁ → RD The following operations are manual (b-3) ~
This is exactly the same as (b-4).

To cancel the connection of the backup device or the faulty working device, just press the release switch SW ₃ .

The spare machine is not limited to TC ₁ on the left,
Any terminal control device can be used as a standby device. However, since only the active unit on the right (or left) side of the standby unit can be connected to the standby unit, it is best to place the standby unit at the left end (or the right side if the first contact circuit is also placed on the left side). desirable.

Of course, each relay circuit can be configured by an electromagnetic relay circuit or a switching circuit using a semiconductor.

Note that a plurality of terminals are generally connected to each terminal control device.

〔Effect of the invention〕

As is clear from the above explanation, the present invention has the following remarkable effects.

(i) Misconnection of two or more working machines to a standby machine can be reliably prevented, whether manually or automatically.

(ii) Any terminal control device can be used as a spare device.

(iii) Since the switching drive circuit has the same configuration, the switching mechanism does not become complicated even if the number of terminal control devices increases.
Since the switching drive circuits are compatible, it is advantageous in terms of assembly and maintenance.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a working/standby switching system of a conventional terminal control device, FIG. 2 is a block diagram of an embodiment of the present invention, and FIG. 3 is an explanatory diagram of a switching drive circuit used in the present invention. In the figure, TC ₁ ~TC _o , TC _s are terminal control devices, EC ₁
~EC _o is a switching machine, CL, CL ₁ , CL ₂ are external crossover wires,
IL ₁₁ to _{IL 1o} are the first internal crossover wires, IL ₂₁ to _{IL 2o} are the second internal crossover wires, ECD ₁ is the switching drive circuit, Pc ₁₁ is the first protection relay, and PC ₁₂ is the second protection relay. ,
D ₁ to _{D 2} are diodes, l ₁ and l ₂ are the first and second protection wires, and EX ₁₁ , EX ₁₂ and EX ₁₃ are the first, second and third protection wires.
switching relay, e ₁₃₁ and e ₁₃₂ are the first and second contact circuits, SW ₁ is the automatic/manual switching switch, SW ₂ is the working/standby switching switch, SW ₃ is the release switch,
EXD is switching discrimination circuit, RD is relay driver, B
indicates the power line.

Claims (1)

[Scope of Claims] 1. A plurality of terminal control devices including backup devices that control terminal devices, a switching device connected to the terminal control device, and each external crossover wire connecting each switching device in series. , each switching drive circuit that operates each of the switching machines, and a first protection line and a second protection line that control the operation of each switching drive circuit, and each of the switching machines is connected to a different external crossover wire. The terminal control device of the switching machine connects the first internal crossover wire and the second internal crossover wire to the first and second internal crossover wires when not in operation, and connects the first internal crossover wire to the first internal crossover wire when in operation. a first contact circuit that connects the terminal to the terminal control device when not in operation, and a second contact circuit that connects the terminal to the second internal crossover wire when in operation.
each of the switching drive circuits has a first switching relay that performs a switching operation using the first contact circuit, and a second switching relay that performs a switching operation using the second contact circuit. and a third switching relay that is activated by the first or second switching relay and switches the first and second contact circuits to the operating side. When a failure occurs in the terminal control device connected to the standby terminal control device, the switching operation of only the first switching relay in the switching device connected to the standby terminal control device causes the standby terminal control device to be connected to the external device that connects the other switching devices. The second switch in the switching machine connected in series with the crossover wire and connected to the terminal control device where the fault occurred.
A switching system for switching between active and standby terminal control equipment, characterized in that a terminal control equipment in which a fault has occurred and a connected terminal are connected to the external crossover wire by a switching operation of only a switching relay.