KR101061446B1 - Breaker failure protection apparatus in protection relay - Google Patents

Abstract

The present invention provides a protection relay having a correction and automatic switching logic circuit (1) of a built-in protection relay in which a failure protection method is automatically switched according to a relay state or a communication state. A blocking failure protection apparatus of claim 1, wherein the correction and automatic switching logic circuit (1) comprises: a third inverter (IN3) to which correction element No use is applied; A fourth inverter IN4 receiving an external relay 2 out of 2 signal; Signal com. A fifth OR gate OR5 receiving a fail, a correction element 1 out of 2, an output signal of the fourth inverter IN4, and an external relay fail signal; A fifth AND gate (AND5) receiving the output signal of the third inverter (IN3) and the output signal of the fifth OR gate (OR5); And a sixth AND gate AND6 receiving the correction element 2 out of 2 and an external relay 2 out of 2 signal.

Description

Breaker Failure Protection Apparatus in Protection Relay

The present invention relates to a breaker failure (B / F) protection device of the protection relay, and in particular, the built-in failure failure protection panel built in the protection relay, the failure protection of the protection relay to perform the failure protection protection only by the protection relay Relates to a device.

Since the existing failure protection relay method was used by separately constructing the failure protection panel, there were many negative aspects in terms of reliability such as economic burden, hard wire connection error, and increased malfunctioning points.

In other words, in the current automated substation, the protection relay is installed in a local control panel, and a failure protection panel is separately configured, which causes negative aspects in terms of economic efficiency, reliability, and convenience of construction.

The present invention has been invented in view of the above-mentioned, and the built-in blocking failure protection panel in the protection relay to perform the blocking failure protection function only by the protection relay, the blocking of the protection relay that can increase the completeness of the substation automation The purpose is to provide a failure protection device.

Block failure protection device of the protection relay according to the present invention for achieving the above object,

Correction of the breaking failure protection method of the relay and protection of automatic failure switching of the failure protection method according to the relay status or communication status. In the device,

The correction and automatic switching logic (1),

A third inverter IN3 to which correction element No use is applied;

A fourth inverter IN4 receiving an external relay 2 out of 2 signal;

Signal com. A fifth OR gate OR5 receiving a fail, a correction element 1 out of 2, an output signal of the fourth inverter IN4, and an external relay fail signal;

A fifth AND gate (AND5) receiving the output signal of the third inverter (IN3) and the output signal of the fifth OR gate (OR5);

And a sixth AND gate AND6 receiving the correction element 2 out of 2 and an external relay 2 out of 2 signal.

In addition, the present invention, correction of its own relay to 1 out of 2, or com. If a failure occurs, the external relay is not corrected 2 out of 2, or the external relay is bad,

The high level signal is output from the fifth OR gate OR5 and input to the fifth AND gate AND5. Since the use is not a no use, the no use outputs a low level signal so that the high level signal passes through the third inverter IN3. It is output to the fifth AND gate (AND5), the high-level signal is output from the fifth AND gate (AND5) is characterized in that the failure failure protection applied to 1 out of 2.

The present invention is also characterized in that the failure failure protection is applied to 1 out of 2 by correcting its own relay and the relative relay to 2 out of 2 and outputting a high level signal from the 6th AND gate AND6.

In addition, the present invention, in the state that both its own relay and the relative relay is corrected to 2 out of 2, com. When a fail or relay fail occurs, it is automatically converted to 1 out of 2.

In addition, the present invention is characterized in that when a relay failure occurs in its relay, the relay itself is switched to 1 out of 2 without performing its protective function.

According to the present invention, the built-in failure relay (B / F) function in the protection substation in the automated substation to install the protection relay in the local control panel (Local Control Panel), it can bring better results in terms of economic efficiency, reliability, and construction convenience Will be.

In addition, the present invention, by embedding the failure failure protection panel in the protection relay, in the protection system consisting of the first main protection, the second main protection can adopt a two-stage blocking failure protection method to constitute a highly selective and reliable protection system can do.

In addition, 1 out of 2 or 2 out of 2 protection methods can be used, as well as two breaker breakout protections with one protection relay, and the protection method is automatically switched according to the protection relay status or relay communication status. As the method can be applied, a more intelligent blocking failure protection method can be implemented.

In addition, the present invention, when the protective relay and the digital control panel is installed in the LCP (site control panel) due to the digital substation configuration, the overall configuration of the DC circuit, trip, control (Control) Since the window area of the circuit is not necessary, the function of window area of the current B / F protection panel is no longer needed.

Furthermore, in the present invention, since the protection relay method is applied to the rear relay protection as post-protection in the substation system, and the main protection relay method is applied to the PCM (current differential method), timely and technically significant effects can be obtained.

1 is a schematic diagram showing a configuration of a current transformer (CT) circuit;
2 is a circuit diagram of relay output contacts;
3 is a circuit diagram illustrating a 1CB failure failure protection logic of a feeder 1 1st main relay or a feeder 1 2nd main relay;
4 is a 0CB blocking failure protection logic diagram of a feeder 1 1st main relay or a feeder 1 2nd main relay.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of a protective relay CT (circuit transformer) circuit configuration, and description will be given with an example of a failure failure protection in the protection system of the protective relay CT circuit configuration shown in FIG. 1.

In the present invention, by using the current information of the CT source input to the relay, the relay operation information configured to perform the operation of the CB blocking failure protection logic circuit shown in Figs. Will be protected.

For example, the breaker (B / F) protection function of 0CB (Circuit Breaker) is a feeder 1 1st main relay and feeder 1 2nd main protection relay (Feeder 1 2nd). Main Relay) and Feeder 2 1st Main Relay and Feeder 2 2nd Main Relay can be used in four places. Selectable use with use selection function.

In other words, if B / F protection function is used in Feeder1, Feeder2 can be corrected to No use and vice versa.

FIG. 2 is a circuit configuration diagram of the relay contact output contacts, and illustrates a state in which the lock out relay 86 operates according to the action of the output contacts BO1 to BO8 between the relays.

Hereinafter, the correction and automatic switching logic circuit 1 shown in FIGS. 3 and 4 will be described. Since FIG. 4 has the same basic configuration and operation as that of FIG. 3, the following description will focus on FIG. 3. .

3 and 4 are the automatic switching logic circuits in which the failure failure protection method of the relay and the failure failure protection method are automatically switched according to the relay state or the communication state, and each B / F correction element and each logic input It is defined as follows.

B / F correction factor

No use: Do not use the blocking failure protection function in the relay. Corrective element.

1 out of 2: Self-relay failure protection function correction factor.

2 out of 2: Blocked failure protection correction element based on paired external relays, communication status and relay status.

The three correction elements may select only one of the three exclusively from each other, and cannot simultaneously select one of the three correction elements.

Logical input

com. Fail: The paired relays communicate with each other to exchange their health and fault status, relay operation status information, etc., and communication failure information that occurs when a communication problem occurs.

External Relay 2 out of 2: Information received from counterpart relay when B / F correction of paired relay is 2 out of 2.

External Relay Fail: Information generated when paired relays have a problem in performing protection functions due to a serious defect. Information generated when the other relays are judged to be bad. It is important to monitor each other because this information may not be able to inform the relays that they are bad.

External BF Op. : B / F operation information received when blocking failure protection logic of paired relay operates

First, a description will be given of the case where 1 out of 2 is applied to block failure protection.

(1) correct its relay correction to 1 out of 2 (in this case, a high level signal output from 1 out of 2);

(2) com. Fail occurs (in this case, high level signal output);

(3) the external relay is not 2 out of 2 correction (in this case high level signal output from 2 out of 2);

(4) if the external relay is defective (External Relay Fail) (high level signal output);

The high level signal is output from the fifth OR gate OR5 and input to the fifth AND gate AND5. Since the use is not a no use, the no use outputs a low level signal so that the high level signal passes through the third inverter IN3. It is output and input to the fifth AND gate AND5. Therefore, the high level signal is output from the fifth AND gate AND5 to apply the blocking failure protection to 1 out of 2.

Subsequently, if B / F protection is desired to be 2 out of 2, the high level signal is output from the sixth AND gate AND6 only when the self and the relative relay are corrected to 2 out of 2. Even if both your relay and your opponent have corrected 2 out of 2 com. When Fail or Relay Fail occurs, it automatically switches to 1 out of 2. If a relay fails in its own relay, its relay does not perform protection and the relative relay switches to 1 out of 2.

Here, the 1 out of 2 method will be described.

1 out of 2 performs the circuit breaker failure protection function by its own B / F operation, and performs independent B / F protection if the relay failure of the relay itself does not occur. In case of 0CB (0CB means the 0th circuit breaker), B / F function of Feeder1 Protection Relay is used and B / F function of both Feeder2 Protection Relay is disabled. By correcting use, only one of them can be used.

Correct the B / F function of the feeder 1 1st main relay to 2 out of 2 in the 2 series protection mode, and feeder 1 2nd main relay B / F. When the F function is corrected to 1 out of 2 or No use, the B / F function of the feeder 1 1st main relay is automatically switched to 1 out of 2 mode.

Communication between feeder 1 1st main relay and feeder 1 2nd main relay Fail (com. Fail in FIG. 3) or feeder 1 1st main protection relay (Feeder) Even if one of the relays 1 1st Main Relay and Feeder 1 2nd Main Relay generates a relay failure (relay failure in FIG. 3), even if the relay failure is performed in a 2 out of 2 manner, FIG. By the correction and automatic switching logic circuit 1 shown in FIG.

If you want to perform B / F protection with 1 out of 2, you can use both as 1 out of 2 or only one of them.

Feeder 1 1st Main Relay and Feeder 1 2nd Main Relay are both corrected to 1 out of 2, resulting in ground fault on A of Feeder 1 during operation. If this occurs, the feeder 1 1st main relay and the feeder 1 2nd main relay A phase operate simultaneously and send a trip command to 1CB. Trip the breaker.

If 1CB fails, the Protection Trip_A ph of the Feeder 1 1st Main Relay becomes the External BF Initiate_A ph of the Feeder 1 2nd Main Relay, and the Feeder 1 The Protection Trip_A ph of the Feeder 1 2nd Main Relay becomes the External BF Initiate_A ph of the Feeder 1 1st Main Relay, so the Feeder 1 1st Main Relay Both the Main Relay and the Feeder 1 2nd Main Relay perform the failure protection as follows.

OR gate 1 (OR1) output by Protection Trip_A ph or External BF Initiate_A ph in FIG. 3;

Current information flowing to Ia of Source1 of the feeder 1 1st main relay A ph current≥Iset; Information;

1CB A ph "a" Closed; And

1CB A ph " b " Open input is satisfied and outputs a high level signal from the first AND gate AND1, and outputs t1 after a time operation timer correction time via the fourth OR gate OR4;

Information that is not Relay Fail;

The fourth AND gate AND4 output, which is the logic processing of the fifth OR gate OR5 output by BF correction 1out of 2, with the AND gate, is ANDed with the information other than the 2 out of 2 correction and the eighth AND gate AND8, and the output contact point is output. Activate (BO1 / BO2).

The lock out relay 86 operates only when the operated output contacts BO1 and BO2 are simultaneously operated as shown in FIG. 2 to improve reliability.

Next, 2 out of 2 methods will be described.

The 2 out of 2 method is applied in the two-stage protection relay method. Two relays of the feeder 1 first main relay and the feeder 1 2nd main relay are used. All of them must be corrected to 2 out of 2 methods to apply them. If no 2 out of 2 methods are selected, 2 out of 2 methods are not applied. The relay contact output BO3 operated in 2 out of 2 mode is connected in series as shown in FIG.

Assuming that a ground fault has occurred on A of feeder 1 during operation out of 2, feeder 1 1st main relay and feeder 1 2nd main relay Phase A of) operates simultaneously and trips the breaker by sending a trip command to 1CB and 0CB.

At this time, if 1CB fails, the Protection Trip_A ph of the Feeder 1 1st Main Relay becomes the External BF Initiate_A ph of the Feeder 1 2nd Main Relay. Since Protection Trip_A ph of Feeder 1 2nd Main Relay becomes External BF Initiate_A ph of Feeder 1 1st Main Relay,

The B / F protection operation of the feeder 1 1st main relay is:

A first OR gate (OR1) output by Protection Trip_A ph or External BF Initiate_A ph;

Current information flowing to Ia of Source1 of the feeder 1 1st main relay A ph current≥Iset; Information;

1CB A ph "a" Closed; And

1CB A ph " b " Open input is satisfied and the high level signal is output from the first AND gate AND1, and the high level signal is corrected to the time operation timer t1 via the fourth OR gate OR4. If the relay fails after a time, a high level signal is output from the fourth AND gate AND4.

The fourth AND gate AND4 output generated as described above;

Information that is not a relay fail of the feeder 1 first main relay;

2 out of 2 correction information;

Information that is not defective of the External Relay Fail of the Feeder 1 2nd Main Relay;

External Relay BF op. For BF operation of Feeder 1 2nd Main Relay. Information;

If there is no communication between the feeder 1 1st main relay and the feeder 1 2nd main relay (not com.fail), the output of the 7th AND gate (AND7) This occurs to operate the output contacts BO3 and BO4.

Operate the lockout relay 86BF 1CB by connecting the output contacts BO3 and BO4 in series with the feeder 1 2nd main relay to eliminate faults.

FIG. 4 is a logic circuit diagram of a 0CB failure failure protection circuit of a feeder 1 1st main relay or a feeder 1 2nd main relay, which is the same as the circuit operation of FIG. Operation to correct the 0CB blocking failure of the feeder 1 1st main relay or the feeder 1 2nd main relay and according to the relay status or communication status. The protection method is automatically switched to operate the output contacts BO5 and BO6 or the output contacts BO7 and BO8.

CB: Circuit Breaker
BI: Binary Input
BO: Binary Output
BO1, BO2, BO3, BO4: 1 out of 2 output contact
BO5, BO6, BO7, BO8: 2 out of 2 output contact
86: Lockout Relay
86BF 1CB: Lockout Relay that operates when 1CB is blocked
86BF 0CB: Lockout Relay that operates when 0CB interruption fails
Feeder 1 1st Main Relay: Feeder 1 Main Protection Relay
Feeder 1 2nd Main Relay: Feeder 1 2nd Main Protection Relay
External BF Initiate_3 ph: 3-phase operation information of external relay
External BF Initiate_A ph: Operation information of phase A of external relay
Protection Trip_3 ph: 3-phase operation information of own relay
Protection Trip_A ph: Operation information of phase A of own relay
A ph current≥ Iset: Pick-up element when the current in A flows over the set value
CB A ph "a" closed: Contact information attached when A-phase breaker is closed
CB A ph "b" open: Contact information attached when A-phase breaker is open
Relay Fail: Relay malfunction
com Fail: Communication failed for pair relay
No use: Disable B / F function
1 out of 2: Block failure protection by own B / F operation
2 out of 2: Block failure protection by B / F operation information of external relay and own B / F operation
External Relay Fail: Malfunction of external pair relay
External B / F op: Block operation failure information of external pair relay

Claims (5)

Correction of the breaking failure protection method of the relay and protection of automatic failure switching of the failure protection method according to the relay status or communication status. In the device,
The correction and automatic switching logic (1),
A third inverter IN3 to which correction element No use is applied;
A fourth inverter IN4 receiving an external relay 2 out of 2 signal;
Signal com. A fifth OR gate OR5 receiving a fail, a correction element 1 out of 2, an output signal of the fourth inverter IN4, and an external relay fail signal;
A fifth AND gate (AND5) receiving the output signal of the third inverter (IN3) and the output signal of the fifth OR gate (OR5);
And a sixth AND gate (AND6) receiving a correction element 2 out of 2 and an external relay 2 out of 2 signal.
The method of claim 1, wherein the relay correction is corrected to 1 out of 2, or com. If a failure occurs, the external relay is not corrected 2 out of 2, or the external relay is bad,
The high level signal is output from the fifth OR gate OR5 and input to the fifth AND gate AND5. Since the use is not a no use, the no use outputs a low level signal so that the high level signal passes through the third inverter IN3. Output failure is input to the fifth AND gate (AND5), the failure failure protection device of the protection relay, characterized in that the failure failure protection applied to 1 out of 2 by the high level signal is output from the fifth AND gate (AND5). .
2. The blocking failure protection is applied to 1 out of 2 by correcting its own relay and its counterpart to 2 out of 2 and outputting a high level signal from the 6th AND gate AND6. Blocking failure protection device of protective relay.
4. The method of claim 3, wherein both its relay and its counterpart have been corrected to 2 out of 2. com. Block failure protection device of protection relay, characterized in that the automatic switching to 1 out of 2 when a failure or relay failure occurs.
The apparatus of claim 4, wherein when a relay fails in the relay, the relay does not perform a protection function and the relative relay is switched to 1 out of 2.

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