JPS6093731A - Monitor of relay circuit for disconnecting switch contact amplifier - 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] [Technical Field of the Invention] The present invention is directed to one circuit failure in a relay circuit for increasing the number of contacts that open and close together with the main contacts of a disconnector used in a power system bus bar protection device, etc. This invention relates to a monitoring device for a relay circuit for disconnector contact amplification for monitoring.

[Prior art]

A conventional device of this type is shown in FIG. In the figure, (1) is an auxiliary A contact that opens and closes with the opening and closing of the main contact DB of the disconnector, (2) is an auxiliary contact that opens and closes in the opposite direction to the opening and closing of the main contact DB, and (3) is a keep for amplifying the disconnector contact. The operating coil of the relay, 141 is its return coil, 151
t6) is the B contact that opens when the keep relay operates, (7) and (8) are the A contacts that close when the keep relay operates, and +91+IQ is the keep relay contact +51 (
These resistors (9) are connected in series with each other.
) and contact (5) form the first series circuit, resistor ■q and contact (7
) form a second series circuit. Uυ is the resistance (9
) and contact (51), resistor ill and contact (7)
A2 is a control power supply connected to the monitoring relay connected between the connection points.Next, its operation will be explained. In the relay circuit of FIG. 1, the main contact DS of the disconnector is closed.

When the a contact (1) is closed and the b contact (2) is open,
The operating coil (3) of the keep relay for disconnector contact amplification is momentarily energized, and the keep relay operates. Due to this operation, the keep relay B contacts (51+61 open, and the A contacts (7)
(8) is closed. At this time, the monitoring relay aυ is connected to the control power supply 02. It is energized and operated by the circuits of the disconnector auxiliary a contact (1), the resistor (9), the monitoring relay CII), and the keep relay a contact (7), indicating that the 7 circuits are normal. Next, when the disconnector is turned on and the main contact DS opens, the contact (11) opens and the 7 contact (2) closes.Then, the return coil (4) of the keep relay is momentarily energized, and the keep relay returns. Contacts +71 and +81 are opened, and contacts +51 and +61 are closed.Thus, monitoring relay αυ now becomes contact (2).

Resistance a1. Contact (5) is now energized and operates, indicating that the 9 circuit is normal.

In addition, if contacts i51 (71) open or close together due to a failure in the keep relay, cable breakage 1
If the energizing circuit of the monitoring relay Cl1l is disconnected due to a disconnection in the wiring within the circuit, or when one of the disconnector auxiliary contacts +11 to +21 opens, the other must close.
If both open due to a pallet error, the monitoring relay O
υ is deenergized and one circuit is detected to be faulty.

However, the pallet of the disconnector auxiliary contacts (1) and (2) was abnormal.

When one contact is closed, the other contact does not open and remains closed, the above monitoring relay αυ
There were some drawbacks that could not be detected by using only one method.

For example, in the contact state shown in Figure 1, if we consider a case where the main contact DS of the disconnector is closed and its A contact (1) is closed, but the B contact is not open, even in that case, the keep relay operating coil ( 3) is energized and the keep relay operates, opening contact (5) and closing contact (7). Therefore, monitoring relay U operates and does not detect any abnormality. That is, contacts fl) and f2- are both closed. If the 2-keep relay is working properly and the contacts (
5) As long as one of (7) is open and the other is closed, the monitoring relay αυ is always activated, making it impossible to detect one circuit failure.

[Summary of the Invention J This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and by separately providing an auxiliary relay that operates when the disconnector auxiliary contact (+lf2+ is opened), the above-mentioned disconnector It is an object of the present invention to provide a monitoring device for a relay circuit for disconnecting switch contact amplification, which can reliably detect a failure even in the event of a bullet abnormality in which both auxiliary contacts close.

[Embodiments of the invention]

An embodiment of the present invention will be described below.

In FIG. 2, (1) to θ2 indicate the same parts as the same reference numerals in FIG. 05 is the b contact of the first auxiliary relay 03, and the a field is the b contact of the second auxiliary relay α4, which is energized by the closing of the second auxiliary relay α4.

Next, its operation will be explained. The normal operation of the circuit is the first
As in the case shown in the figure, the monitoring relay 0υ operates. When the A contact (11) of the disconnector is open and normal, the B contact (2) is abnormal, the cable is broken, and when the B contact (2) of the disconnector is open and normal, the A contact (1) is abnormal. , it is possible to detect cable disconnection abnormalities and keep relay operational abnormalities by using the monitoring relay aυ as in the past.When the A contact flll of the disconnector is closed and normal, the B contact +21
If it is closed even though it should be fr'-fin, the first. Since the second auxiliary relays QI and Q(l are both energized and their b contacts (1!9 and ae) are both open, the monitoring relay αυ changes from the operating state to the recovery state, making it possible to detect a failure. When the B contact (2) of the disconnector is closed and normal,
Even if the a contact (11) is closed even though it should be open, the first and second auxiliary relays 03a4 operate together, and since the contact (149 (ls) are both open, the monitoring relay aυ enters the recovery state, and a failure can be detected.

〔Effect of the invention〕

Since the present invention is configured as described above, any pallet abnormality of the disconnector auxiliary contact can be reliably detected in the disconnector contact amplifying relay circuit. It has excellent effects.

[Brief explanation of drawings]

FIG. 1 is an expanded connection diagram of a conventional monitoring device for a relay circuit for disconnector contact amplification, and FIG. 2 is an expanded connection diagram showing an embodiment of the present invention. In the figure, (1) is the disconnector auxiliary contact a, (2) is the same contact, (3) is the operating coil of the keiso relay for amplifying the disconnector contact, (4) is the return coil of the same relay, +51+61 is the b of the same relay. Contact, (7) (81 is the a contact of the same relay, (9) 4 is the resistance, aυ is the monitoring relay, a is the control power supply, the target is the first auxiliary relay, α4 is the second auxiliary relay,
0!9 is the B contact of the first auxiliary relay (13), (IQ is the B contact of the second auxiliary relay A station. Agent Masuo Oiwa (and 2 others)

Claims (1)

[Scope of Claims] An auxiliary a contact that opens and closes with the opening and closing of the main contact of the disconnector; an auxiliary contact that opens and closes in the opposite direction to the opening and closing of the main contact; a disconnector contact that is energized by the control power source when the auxiliary a contact is closed; The operating coil of the amplifying keep relay, the return coil of the keep relay which is energized by the control power supply when the auxiliary contact is closed, and the auxiliary A contact were connected to the control power supply. A first series circuit of a resistor and a B contact that opens when the keep relay operates, and a second series circuit that includes a resistor connected to the control power source via the auxiliary contact and an A contact that closes when the keep relay operates. circuit, and a monitoring relay connected between the connection point between the resistor of both circuits and the keep relay contact. In a monitoring device for a disconnector contact amplification relay circuit that detects a circuit failure due to non-operation of the monitoring relay, a first auxiliary relay is connected in parallel to the first series circuit,
A second auxiliary relay is provided in parallel with the second series circuit, and the b contact, which is opened by the operation of the first auxiliary relay, is connected to the resistance of the second series circuit by the operation of the second auxiliary relay. The b contact that opens is the resistor of the first series circuit. A monitoring device for a relay circuit for disconnector contact amplification, characterized in that each is inserted in series.