JPH0624346U - Circuit breaker Pallet information detection circuit - Google Patents

Abstract

(57) [Summary] [Purpose] To detect abnormalities in breaker pallet information reliably. [Structure] A pair of contacts of the circuit breaker CB has an auxiliary relay R
1 to R2 are connected. The breaker state input terminal CB1 of the microcomputer unit 1 is connected to the a contact R1 of the auxiliary relay R1.
Power line P4 through a and contact b R2b of auxiliary relay R2
The signal is input from 1. Also, breaker status input terminal CB
2, the b contact R1b of the auxiliary relay R1 and the auxiliary relay R1
A signal is input from the power line P41 through the second a contact R2a. The microcomputer unit 1 has a circuit breaker state input terminal CB1,
If there is no signal input from any of CB2, it is determined that the breaker pallet information is abnormal.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a circuit breaker pallet information detection circuit, and more particularly to a circuit breaker pallet information detection circuit used in a status input circuit for devices such as circuit breakers in digital protective relays.

[0002]

[Prior art]

 Instead of the analog type or static type analog relays that have been used in the past, the data obtained by digitally converting the analog amounts of the voltage and current of the input PT and CT are calculated by a microcomputer based on specified software. Digital relays that are processed and sequenced to achieve the desired relay function are widely used. This type of digital relay is, for example, a digital protective relay device that responds to an abnormal condition such as a short circuit or a ground fault that occurs in a power line or power equipment, disconnects the faulty part from the power source, or shuts down the operation. Used for.

In this digital type protective relay device, the state of equipment such as a breaker is received by a keep relay (holding type relay), the contacts of this keep relay are taken into the microcomputer section as information, and this information is stored in software. Used directly for wear sequences.

[0004]

[Problems to be solved by the device]

 By the way, in the information input to the above state input circuit, for example, circuit breaker pallet information, when the circuit breaker pallet is in a failure mode in which both contacts a and b are made, circuit breaker pallet information flickers, As a result, there is a problem that the sequence operation in the digital protective relay device becomes unstable. When the breaker pallet is in a failure mode where both contacts a and b break, the sequence does not work even if the breaker operates, so there is a problem that the sequence malfunctions or malfunctions. is there.

An object of the present invention is to provide a circuit breaker pallet information detection circuit capable of reliably detecting the above-mentioned abnormality in circuit breaker pallet information.

[0006]

[Means for solving problems]

 The circuit breaker pallet information detection circuit of the present invention detects the ON and OFF states of the circuit breaker, and operates the first and second auxiliary relays, the a contact of the first auxiliary relay, and the second auxiliary relay. The first breaker state input terminal connected to the power line via the b-contact of the auxiliary relay, and to the power line via the b-contact of the first auxiliary relay and the a-contact of the second auxiliary relay. And a microcomputer section having a second circuit breaker status input terminal, the microcomputer section being interrupted when there is no signal input from either of the first and second circuit breaker status input terminals. It is characterized by determining that the container pallet information is abnormal.

[0007]

[Action]

 According to the detection circuit of the present invention, when an abnormality occurs in the breaker pallet information, it can be detected immediately. Therefore, the reliability of the breaker pallet information can be improved, and the malfunction or malfunction of the sequence in the digital protective relay device can be reduced.

[0008]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1A, one of the pair of contacts of the circuit breaker CB is connected to the auxiliary relay R1 (52AX), and the other contact is connected to R2 (52BX). The a contacts R1 a and R2 a and the b contacts R1 b and R2 b of the relays R1 and R2 are connected between the power line P24 and the state input terminals CB1 and CB2 of the microcomputer unit 1 as shown in FIG. 1 (b). ing. The state input terminal CB1 is connected to the power line P24 through the a contact R1a of the auxiliary relay R1 and the b contact R2b of the auxiliary relay R2. The state input terminal CB2 is connected to the power line P24 via the b contact R1b of the auxiliary relay R1 and the a contact R2a of the auxiliary relay R2. Here, the state input terminal CB1 is a terminal to which the state of the circuit breaker “ON” is input, and the state input terminal CB2 is a terminal to which the state of the circuit breaker “OFF” is input.

Both contacts (a contact CBa, b contact CBb) of the auxiliary contact CB are connected to the keep relay R3. A switch 2 is connected to the keep relay R3 for manually energizing the return coil of the relay relay R3 to perform a return operation after the abnormal condition is resolved. The keep relay R3 has two coils, an operation coil S and a return coil R, and the state of an output contact (not shown) provided outside is switched by exciting one of the coils. The keep relay R3 itself has a memory function, and the state in which the keep relay R3 is operated by the operation or return input signal input to the operation coil S or the return coil R via the circuit breaker CB changes from the state in which the other input signal It holds until given.

The microcomputer unit 1 is for performing various kinds of processing and monitoring based on the breaker pallet information detected by the auxiliary coils R1 and R2 and their contacts, and FIG. 2 shows a sequence therefor. It was In the configuration shown in Fig. 2, when the microcomputer detects that there is an abnormality in the breaker pallet information, the information before the abnormality is given to the sequencer, and the fact that there is an abnormality in the pallet information is displayed externally by an LED lamp or the like. It has a function to inform. Needless to say, how to handle the breaker pallet information after abnormality detection can be arbitrarily changed by a program (software).

That is, in FIG. 2, the microcomputer unit 1 includes a pair of photocouplers PC1 and PC2 connected to the status input terminals CB1 and CB2, respectively, and an OR connected to the outputs of the photocouplers PC1 and PC2. Circuits 10 and 10 ms delay circuit 11, AND circuits 12 and 13 and flip-flop 14 to which outputs of OR circuit 10 and delay circuit 11 are connected, and outputs of these AND circuits 12 and 13 and flip-flop 14 are connected. It is composed of an AND circuit 15 and an OR circuit 16. Further, the output of the OR circuit 16 is connected to the LED 17. The input from the OR circuit 10 to the AND circuit 12 is an inverting input. Further, instead of inputting the output of the OR circuit 16 (abnormality detection output) to the LED 17, it may be connected to, for example, another control circuit or an alarm or warning output circuit.

The operation of the detection circuit of the embodiment having the above configuration will be described.

In the state of FIG. 1 (a) in which the circuit breaker CB does not operate, the auxiliary relay R2 is energized, and the auxiliary relay R1 is not energized. Therefore, in FIGS. 1 (b) and 2, the a-contact of the auxiliary relay R2 is turned on. R2a makes and the contact b R2b breaks. Therefore, a signal is input from the power line P24 only to the circuit breaker state input terminal CB2 of the microcomputer unit 1, and the microcomputer unit 1 detects that the circuit breaker CB is in the "OFF" state.

Further, when the breaker CB operates in FIG. 1A, the b contact CB b breaks and the a contact CBa makes. Then, the operating coil S of the keep relay R3 is activated to perform a predetermined protective operation. At the same time, the auxiliary relay R1 is energized and R2 is de-energized. Therefore, in FIGS. 1B and 2, the a-contact R1a of the auxiliary relay R1 is made and the b-contact R1b is broken. Therefore, a signal is input from the power line P24 only to the circuit breaker state input terminal CB1 of the microcomputer unit 1, and the microcomputer unit 1 detects that the circuit breaker CB is in the "ON" state.

The above is the operation when the breaker pallet information is normal. Next, the operation when the breaker pallet information is abnormal will be described. That is, in this case, all of the a contacts R1a and R2a and the b contacts R1b and R2b of the auxiliary relays R1 and R2 are made or broken. Therefore, no signal is input to any of the circuit breaker state input terminals CB1 and CB2 of the microcomputer unit 1. In this case, the microcomputer section 1 detects that the breaker pallet information is defective, and causes the LED 17 to emit light to display an abnormal display.

[0016]

[Table 1]

Further, even when both the auxiliary relays R1 and R2 are actuated or when the photocouplers PC1 and PC2 malfunction, it is possible to detect these abnormalities as shown in Table 1.

[0018]

[Effect of device]

 As described above, according to the present invention, when an abnormality occurs in the breaker pallet information, it can be immediately detected. Therefore, the reliability of the circuit breaker pallet information can be improved, and the malfunction or malfunction of the sequence in the digital protective relay device can be reduced.

[Brief description of drawings]

1A and 1B are explanatory views showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing details of a microcomputer unit in the embodiment.

[Explanation of symbols]

 1 ... Microcomputer section R1, R2 ... Auxiliary relay R3 ... Keep relay CB ... Breaker PC1, PC2 ... Photo coupler 17 ... LED

Claims (1)

[Scope of utility model registration request] 1. A first auxiliary relay and a second auxiliary relay, which are activated by detecting ON and OFF states of a circuit breaker, respectively, and an a contact of the first auxiliary relay and a b contact of the second auxiliary relay. A first circuit breaker state input terminal connected to the power line via a second circuit breaker state connected to the power line via the contact b of the first auxiliary relay and the contact a of the second auxiliary relay And a microcomputer unit having an input terminal, wherein the microcomputer unit has abnormal circuit breaker pallet information when there is no signal input from any of the first and second circuit breaker status input terminals. A circuit breaker pallet information detection circuit characterized by making a judgment.