JPH0694780A - Gas fire extinguishing equipment equipped with ground fault detection circuit - Google Patents

Abstract

PURPOSE:To detect the ground fault of an electric circuit in gas fire extinguishing equipment using a gas fire extinguisher. CONSTITUTION:Gas fire extinguishing equipment has a control circuit 1 equipped with the operation circuits 5 provided to a fire zone and a demarcated control circuits 3 to which a power supply circuit 2 outputting positive and negative voltage power supply lines and the operation circuits 5 are connected. The demarcated control circuits 3 are further equipped with ground fault detection circuits 4 connected to operation circuits 5 by demarcated connection wires L3 and the ground fault detection circuits 4 have voltage detecting resistors connected to the demarcated connection wires L3 at one ends thereof and connected to the power supply lines at the other ends thereof and the voltages generated in these resistors are monitored to detect the generation of a ground fault.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas fire extinguishing facility for extinguishing a fire by using a gas fire extinguisher, and more particularly to a ground fault detection capable of detecting a ground fault of an electric circuit used in the circuit. The present invention relates to a gas fire extinguishing facility equipped with a circuit.

[0002]

2. Description of the Related Art Gas-based fire extinguishing equipment for extinguishing fires by using carbon dioxide, halon, etc. as extinguishing agents is today used in parking lots, electrical equipment rooms, computer rooms, communication equipment installation rooms,
It is installed in many places such as hazardous materials facilities. This gas fire extinguishing equipment usually has an operation box arranged in each of a plurality of fire protection compartments and provided with an operation circuit, respectively, and a control panel having a control circuit to which each operation circuit is connected.

The operating circuit includes a starting circuit. When a fire occurs, the starting circuit is operated by a switch operation of a person in the fireproof compartment, and a signal is transmitted from the operating circuit to the control circuit. Based on this signal, the control circuit sends out various commands such as the generation of a fire alarm for the evacuation of personnel, the operation of a timer, and the release of gas to the fire prevention section after a predetermined time has passed, thereby extinguishing the fire. In addition, a transfer signal indicating these states is transmitted to the central monitoring board.

Further, when the fire extinguishing equipment is automatically started, a fire detection signal from a fire detector is input to the control circuit, and a command for releasing gas is sent out.

[0005]

While such a gas-based fire extinguishing system is required to operate quickly in the event of a fire, it is desirable to prevent the extinguishing agent from being released due to a malfunction. Be done. In particular, when carbon dioxide is used as a fire extinguishing agent, there is a risk of causing harm to the human body, such as suffocating the person on the spot, so the demand for safety measures against malfunctions has increased in recent years as carbon dioxide extinguishing agents have spread. Is coming.

[0006] As one of the demands, it is desired to display the electric line between the operation box and the control panel, the power supply line, and the activation circuit in the operation box when the ground fault occurs. As another demand, it is desired to prevent malfunction due to short circuit of the starting circuit. The present invention has been made in view of the above demands, and an object thereof is to provide a gas fire extinguishing facility including a ground fault detection circuit.

Another object of the present invention is to provide a gas-based fire extinguishing equipment capable of detecting a ground fault in each fire extinguishing compartment in a fire extinguishing equipment having an operation box for each of the fire extinguishing compartments. Another object of the present invention is to provide a gas-based fire extinguishing facility capable of identifying a short circuit in a starting circuit and a ground fault.

[0008]

In order to achieve the above object, in a gas fire extinguishing facility equipped with a ground fault detection circuit of the present invention, an operation circuit including a starting circuit provided in a fireproof compartment,
A control circuit having a power supply circuit for outputting a positive voltage and a negative voltage power supply line and a fractionation control circuit connected to the operation circuit, and a start signal by the start circuit is transmitted to the fraction control circuit. In a gas fire extinguishing facility to which a command to release a gas fire extinguishing agent from the fraction control circuit to the fire prevention section is sent,
The fraction control circuit is connected to the operation circuit, and a fraction connection line is provided to connect the ground fault monitoring circuit and each element, and the control circuit further connects the power line and the ground point via a resistor. A voltage detecting resistor having a connecting neutral circuit, one end of which is connected to the power supply line from the neutral circuit and the other end of which is connected to the fractional connecting line; and a voltage generated at the other end of the voltage detecting resistor. The fractionation control circuit includes a ground fault detection circuit including a circuit that detects a change and detects a ground fault occurrence in the ground fault monitoring circuit based on the change in the voltage.

Further, a plurality of fire protection compartments are provided with a plurality of operation circuits provided for each fire protection compartment, and the control circuit has a plurality of fractionation control circuits corresponding to the plurality of operation circuits. It is possible to detect the occurrence of the ground fault of the fault monitoring electric circuit for each fire prevention section. Further, the control circuit connects the positive voltage power supply line and the negative voltage power supply line in parallel with the neutral circuit via a resistor and connects a voltage between an intermediate point of the positive voltage power supply line and the negative voltage power supply line to a ground point of the neutral circuit. A power supply line ground fault detection circuit that detects a difference and detects occurrence of a ground fault of the power supply line based on a change in the voltage difference may be provided.

In order to perform both ground fault detection and short circuit detection,
Furthermore, when the starter circuit is short-circuited and a current flows through the circuit by connecting the electric circuit to which the start-up signal of the operation circuit is sent and the fractional connection line, the ground fault detection circuit causes the voltage detection resistor to operate. It is also possible to detect the occurrence of a short circuit from the change in the voltage generated at the other end.

[0011]

When the ground fault monitoring circuit is grounded, a ground current flows between the ground point and the ground fault point of the neutral circuit, and the current flows through the voltage dividing resistance through the fractional connecting line. Therefore, the voltage generated in the voltage detecting resistor changes more than in the normal state. It is possible to detect that a ground fault has occurred by detecting this change.

Further, the relationship between the potential of the ground point of the neutral circuit and the potential of the intermediate point which is not grounded and which is generated by the resistance connecting the power source line in parallel with the neutral circuit is that the normal state and the power source line are grounded. It changes with time. By detecting this change, it is possible to detect that a ground fault has occurred in the power supply line. Furthermore, when the activation signal flows even though the activation circuit is short-circuited and the operation circuit is not activated, the current flows through the voltage detection resistor through the fractionation control line. Therefore, the voltage generated in the voltage detecting resistor shows a change different from that in the case of the ground fault, and it is possible to detect that a short circuit has occurred by discriminating this change.

[0013]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic overall view of this embodiment, and FIG. 2 is a detailed circuit diagram of its main part. In the figure, 1 is a control circuit installed in the control panel, and 5, 5 ... are operation circuits installed in an operation box arranged for each fireproof compartment.

The control circuit 1 rectifies an AC voltage and outputs a voltage + B, -B and + E, and a power supply circuit 2 and fractionation control circuits 3, 3 ... The neutral circuit 6 and the + B ground fault detection circuit 7 are provided. Each fraction control circuit 3 responds to the signal from the operation circuit 5 or the fire detection signal from the fire detector by a fire alarm signal,
It is a circuit for outputting various operation signals such as a door closing signal and a fire extinguishing agent release signal, and also supplying a transfer signal representing these states to the central monitoring panel to display to a monitoring person. Further, each fraction control circuit 3 includes a ground fault detection circuit 4 connected to the operation circuit 5 via a fraction connection line L3, and together with the neutral circuit 6, detects a ground fault for each fire prevention section. . The + B ground fault detection circuit 7 is a circuit for detecting a ground fault of the + B power supply line.

FIG. 2 shows a detailed circuit diagram of a main part of the fractionation control circuit 3 including the neutral circuit 6, the + B ground fault detection circuit 7, and the ground fault detection circuit 4 and a main part of the operation circuit 5. In FIG. 2, the electric line L1 is a + B power line from the power supply circuit 2, and the electric line L2 is a −B power line from the power circuit 2. The resistors R1 and R2 that connect the + B power line L1 and the −B power line L2 to the ground point are resistors for forming a ground point and have the same resistance value. The connection point of these resistors is the ground point. Has become. The resistors R1 and R2 form the neutral circuit 6.

Similarly, the resistors R3 and R4 connected in series between the + B power line L1 and the -B power line L2 are R1 and R2.
It is a resistor for detecting a ground fault of the power supply line described later in cooperation with the above, and the potential at the connection point of the resistors R3 and R4 is higher than the potential at the connection point of the resistors R1 and R2 in a normal state. The resistance value is set to. Resistance R1
The connection point of R2 and R2 and the connection point of resistors R3 and R4 are input to the + and-terminals of the comparator C1, respectively, and the comparator C1
Is output to the OR circuit OR1. This resistance R
3, R4 and the comparator C1 form a + B ground fault detection circuit 7.

Next, R7 in the fraction control circuit 3 is for voltage detection for detecting the ground fault of the electric path between the fraction control circuit 3 and the operating circuit 5 and the ground fault in the operating circuit 5. Resistance,
One end is connected to the -B power supply line L2, and the other end is the fractional connection line L3.
And the comparators C2 and C3. The comparator C2 is a ground fault upper limit comparator, which divides the voltage V1 and the voltage generated in the resistor R7 into the upper limit set voltage divided by the variable resistor R5 connected between the constant voltage E and the -B power source line L2. Compare. Similarly, the comparator C3 is a ground fault lower limit comparator, and the constant voltage E and -B
The voltage V2 which is the lower limit setting voltage divided by the variable resistor R6 connected between the power source line L2 and the voltage generated in the resistor R7 is compared. The comparators C2 and C3 are AND circuits A
A window comparator is configured with ND1 and a resistor R7 is used.
AND when the voltage of V satisfies the relation of V1>V> V2
A signal is output from the circuit AND1 and supplied to the OR circuit OR1.

The output end of the OR circuit OR1 is connected to the input end of the open collector OC1, and the open collector OC1 is connected.
Is connected to the cathode end of the light emitting diode D1. Therefore, the light emitting diode D1 is turned on when the signal from the OR circuit OR1 is input to the open collector OC1. The light emitting diode D1 serves as a ground fault detection display as described later.

The + B power supply line L1 from the control circuit 1 is also supplied to the operation circuit 5, and the fractional connection line L3 connected to the resistor R7 is introduced. The switch S0 whose one end is connected to the + B power supply line L1 is a switch which is closed by opening the front door of the operation box, and the other end is a diode in the fractionation control circuit 3 and relays K5 and K6 that pass through the electric line L4. It is connected to the fraction connecting line L3 through. The relays K5 and K6 are for performing the fire extinguishing preparation work, and specifically act as switches for activating an alarm generation circuit (not shown).

The switch S1 which can be operated only after the door of the operation box is opened is a start-up switch for fire extinguishing work, one end of which is connected to the + B power supply line L1 and the other end of which is a fractional connection line via a relay K0. It is connected to L3. When the relay K0 is operated, the contact 0-1 of the operation circuit is switched.
The relay K0 and the contacts 0-1 constitute a starting circuit.

The contact 0-1 connects the + B power supply line L1 and the photocoupler P1 of the fractionation control circuit 3 through the electric path L6 when the relay K0 is in the non-operating state, and the photocoupler P1.
Turn on the transistor. Therefore, the relay K1 having one end connected to the + B power supply line L1 in the fractionation control circuit 3 and the other end connected to the transistor of the photocoupler P1 is a relay.
When K0 is in the non-operating state, it is energized and in the operating state.
On the other hand, the contact 0-1 connects the + B power supply line L1 and the contact 1-1 of the fractionation control circuit 3 through the electric path L5 when the relay K0 is operated. The contact 1-1 is opened when the relay K1 is activated and closed when it is deactivated. Relays K2, K3, and K4 are connected in parallel from the other end of the contact 1-1. Each of the relays K2, K3, K4 is for executing the next work for extinguishing the fire. Specifically, a timer (not shown) is activated to make a delay time and give a grace for evacuation of personnel. It works as a switch for sequentially operating the relay for each operation such as closing the next door and discharging the fire extinguishing agent. The other ends of the relays K2, K3, K4 are connected to the fraction connecting line L3 via a contact 6-2. Contact 6-2 is relay K6
It is closed by the operation of the
3, K4 can be activated when the contacts 0-1 and 1-1 and 6-2 are all closed.

The electric path L5 from the contact 0-1 is also connected to the fraction connecting line L3 via the contact 2-1 in the fraction control circuit 3 and the relay K7. This contact 2-1 is relay K
It is opened by the action of 2. The electric path passing through the contact 2-1 and the relay K7 is for detecting a short circuit in the starting circuit. A contact 6-1 which is closed by the operation of the relay K6 is also connected in parallel with the resistor R7.

The operation circuit 5 further has a plurality of indicator lights D3, D4, D5 and D6 which are light emitting diodes. The diode D3 is a power-on indicator lamp that connects the + B power supply line L1 and the fraction connection line L3. Further, the diodes D4, D5, D6 are a start indicator light, a fire extinguishing agent discharge indicator light, and a valve closing indicator light, respectively, and one end of each of them is an electric circuit L7, L.
8, L9, contacts 8-1, 9-1, of the fractionation control circuit 3,
It is connected to the power supply line L1 through 10-1 and the other end is connected to the fraction connection line L3. Each diode is turned on by closing each contact 8-1, 9-1, 10-1 when the respective work is performed.

Further, the fraction control circuit 3 is provided with a short-circuit display diode D2, the cathode end of which is connected to the output end of the open collector OC2, and the open collector O
The input end of C2 is connected to the contact 7-1. The contact 7-1 is closed by the operation of the relay K7, and the light emitting diode D2.
Is configured to light up. In the fraction control circuit 3 configured as described above, the ground fault detection circuit 4 is mainly composed of resistors R1, R2, R3 and R4, a voltage detection resistor R7 and comparators C1, C2 and C3.

The operation of this embodiment will be described below. When the fire-extinguishing equipment according to the present embodiment is not operated and is in a normal state where neither ground fault nor short circuit occurs, the light emitting diode D3
The electric circuit is formed only by the electric path that passes through and the electric path that connects the + B power supply line L1 through the electric path L6 to the fraction connecting line L3 by the contact point 0-1. Therefore, the resistance R
The voltage developed at 7 is the current (I
1, I2) indicates a substantially constant voltage.

On the other hand, consider a case where one of the electric paths L4 to L9 between the fractionation control circuit 3 and the operating circuit 5 and any of the electric paths in the operating circuit 5 are grounded. Since all the electric paths are always connected to the fraction control line L3 via each element, the ground point and the ground fault point of the neutral circuit 6 are connected, and an electric circuit passing through the resistor R7 is newly formed. Becomes
More current than that in the normal state passes through the resistor R7. As a result, the potential of the resistor R7 on the comparator C3 side (point A in FIG. 2) becomes higher than the normal state (V> V2), the change is detected by the comparator C3, and the output is AND circuit AND1.
Is output to. The lower limit setting voltage V2 of the comparator C3 by the variable resistor R6 is slightly higher than the voltage at the point A of the resistor R7 in the normal state and smaller than the voltage at the point A of the resistor R7 when a ground fault occurs. Set in advance. Further, the upper limit setting voltage V1 described later is set to be higher than the potential at the point A of the resistor R7 which is generated due to these ground faults. Therefore, from the AND circuit AND1 to the OR circuit OR
The signal is output to 1.

Next, when the + B voltage power supply line is grounded, the relationship between the potential at the connection point between the resistors R1 and R2 and the potential at the connection point between the resistors R3 and R4 changes. For example, set + B voltage to +24
V, -B voltage is 0V, R1 = 20kΩ, R2 = 20
Setting kΩ and R3 = 9kΩ, R4 = 15kΩ,
The potential of each connection point is + 12V when viewed from the -B voltage power supply line.
And + 15V, and in a normal state, the potential at the connection point between R1 and R2 is smaller than the potential at the connection point between R3 and R4, and no signal is output from the comparator C1. On the other hand, when the + B voltage power supply line is ground-faulted, the magnitude relation of the potentials at the respective connection points is reversed, and a signal is output from the comparator C1 and supplied to the OR circuit OR1.

As described above, when a ground fault occurs at any place, a signal is input to the OR circuit OR1, the open collector OC1 becomes low level, a current flows through the light emitting diode D1 to emit light, and a ground fault occurs. Display what you have done. Next, consider the case where the contact 0-1 is not switched and the electric line L5 serving as a starting line is short-circuited with the + B power supply line L1. In this case, since the electric path connecting to the fraction connecting line L3 through the electric path L6 is formed as it is, the photocoupler P1 remains ON and the relay K1 is in the operating state. Therefore, the contact 1-1 remains open, and the electric line L5
Even if is short-circuited, the relays K2, K3 and K4 do not operate and no malfunction occurs. Instead of contact 2-
Since 1 remains closed, current I flowing through relay K7
3 will pass through resistor R7. As a result, the potential at the point A of the resistor R7 becomes even higher, and the change is detected by the comparator C2. That is, the comparator C with the variable resistor R5
The upper limit setting voltage V1 of 2 is set to be slightly smaller than the voltage at the point A of the resistor R7 when the short-circuit current I3 flows, and larger than the voltage at the point A of the resistor R7 in the normal state. Therefore, when a short circuit occurs, V> V1 and the AND circuit AND1 does not output a signal. As a result, the ground fault display diode D1 does not light. Instead, relay K
7 is activated, the contact 7-1 is closed, the open collector OC2 becomes low level, and the light emitting diode D
2 emits light, indicating that a short circuit has occurred.

When a fire occurs and the operation box is operated while the gas fire extinguisher is in a normal state, that is, when the door of the operation box is opened, the switch S0 is closed to operate the relay K6. Then, the contact 6-1 is closed and the voltage of the resistor R7 drops to approximately -B. Therefore, the comparators C2 and C3 do not change their outputs and erroneously display the ground fault signal.

As described above, the voltage generated at the point A of the voltage detection resistor R7 in the normal state and the voltage generated at the point A of the voltage detection resistor R7 in the abnormal state are distinguished from each other. It is possible to display various states. In the normal state, the current I1 flowing through the light emitting diode of the photocoupler P1 is used instead of directly using the current flowing through the relay K1 in the operating state as the current flowing through the resistor R7 in the normal state. This is for supplying a stable current to the resistor R7 and stabilizing the voltage at the point A of the resistor R7 without being affected by the instability of the current due to the impedance change of the coil of the relay K1 to be excited.

[0031]

As described above, according to the present invention,
An operation circuit including a start-up circuit provided in the fireproof compartment, a power supply circuit for outputting a power supply line of a positive voltage and a negative voltage, and a control circuit having a fractionation control circuit connected to the operation circuit, In the gas fire extinguisher equipment, in which the activation signal from the activation circuit is transmitted to the fractionation control circuit, and the instruction to release the gas fire extinguisher to the fire prevention compartment is sent from the fractionation control circuit, the fractionation control circuit and the operation circuit The control circuit further includes a neutral circuit that connects the power supply line and the ground point via a resistor. A voltage detection resistor having one end connected to a power supply line from the neutral circuit and the other end connected to the fractional connection line, and a change in voltage generated at the other end of the voltage detection resistor is detected, Change of voltage causes ground fault monitoring A circuit for detecting the 絡発 production, since the ground fault detection circuit was to prepare for the fractionation control circuit composed of, it is possible to reliably detect the grounding of the earth 絡監 viewing path.

Further, the control circuit further connects the positive voltage power source line and the negative voltage power source line in parallel with the neutral circuit via a resistor, and an intermediate point thereof and the ground point of the neutral circuit. Since a power supply line ground fault detection circuit that detects a difference in voltage between the power supply line and the power supply line is detected by a change in the voltage difference, it is possible to reliably detect a ground fault in the power supply line. it can.

Further, when the starter circuit is short-circuited and a current flows in the electric line by connecting the electric path to which the start-up signal of the operation circuit is sent and the fractional connection line, the ground fault detection circuit detects the voltage. Since the occurrence of the short circuit is detected from the change in the voltage generated at the other end of the working resistor, it is possible to detect the short circuit of the starting circuit, and thereby prevent the malfunction.

[Brief description of drawings]

FIG. 1 is a schematic block diagram of an embodiment of a gas fire extinguishing facility according to the present invention.

FIG. 2 is a detailed circuit diagram of a main part of the embodiment of FIG.

[Explanation of symbols]

 1 Control circuit 2 Power supply circuit 3 Fractional control circuit 4 Ground fault detection circuit 5 Operation circuit 6 Neutral circuit 7 Power supply line Ground fault detection circuit (+ B Ground fault detection circuit) L1 Positive voltage power supply line L2 Negative voltage power supply line L3 Fractional connection Line R7 Voltage detection resistor

Claims (4)

[Claims] 1. A control circuit including an operation circuit including a starter circuit provided in a fireproof compartment, a power supply circuit for outputting a power supply line of a positive voltage and a negative voltage, and a fractionation control circuit connected to the operation circuit. In the gas fire extinguishing equipment, which has a start signal from the start circuit, is transmitted to the fraction control circuit, and a command to release the gas fire extinguishing agent to the fire prevention section is sent from the fraction control circuit. The circuit and the operating circuit are connected to each other, and a fractional connection line is provided to connect the ground fault monitoring electric circuit through each element. The control circuit is further provided with a neutral line connecting the power supply line and the ground point through a resistor. A voltage detection resistor having a circuit, one end of which is connected to the power supply line from the neutral circuit and the other end of which is connected to the fractional connection line, and a change in voltage generated at the other end of the voltage detection resistor is detected. However, the ground fault is monitored by the change in the voltage. A gas-based fire extinguishing facility characterized in that the fractionation control circuit is provided with a ground fault detection circuit including a circuit for detecting the occurrence of a ground fault in the visual line. 2. The gas-based fire extinguishing facility according to claim 1, further comprising a plurality of operation circuits provided for each of a plurality of fire protection compartments, wherein the control circuit corresponds to the plurality of operation circuits. Gas fire extinguishing equipment, which has a ground fault detection circuit for detecting the occurrence of a ground fault in each fire prevention section. 3. The gas fire extinguishing equipment according to claim 1, wherein the control circuit further connects the positive voltage power supply line and the negative voltage power supply line in parallel with the neutral circuit via a resistor. A gas comprising a power line ground fault detection circuit that detects a voltage difference between the intermediate point and the ground point of the neutral circuit, and detects a ground fault of the power line by a change in the voltage difference. Fire extinguishing equipment. 4. The gas fire extinguishing facility according to claim 1, wherein the electric circuit to which the activation signal of the operation circuit is sent is connected to the fractional connection line, and the activation circuit is short-circuited to cause a current to flow in the electric circuit. In addition, the gas fire extinguishing equipment, wherein the ground fault detection circuit detects the occurrence of a short circuit from the change in the voltage generated at the other end of the voltage detection resistor.