JP2011229206A - Test charge time-limited settling switching circuit for protective relay - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a test charge time-limited settling switching circuit for a protective relay, in which a time-limited settling value of a bus communication relay or a post-protective relay can be automatically switched during test charge.SOLUTION: A test charge time-limited settling switching circuit 10 includes a one-shot circuit 12 and a time-limited settling value switching control circuit 13 to function as a time-limited settling value switching control means which outputs a time-limited settling value switching signal SW instructing to switch a time-limited settling value of a bus communication relay 20 from a substitutive protection time-limited settling value (=400 ms) to a test charge time-limited settling value (=50 ms) for a fixed time limit (=200 ms) when a breaker power-on signal S for powering on a bus communication breaker is inputted from the outside, and outputs a time-limited settling value switching signal SW instructing to switch the time-limited settling value of the bus communication relay 20 from the test charge time-limited settling value to the substitutive protection time-limited settling value after the lapse of the fixed time limit.

Description

  The present invention relates to a trial charging time setting switching circuit for a protective relay, and in particular, a test of a protective relay suitable for switching the time setting value of a bus connection relay or a rear protection protective relay when a bus connection breaker is turned on during trial charging. The present invention relates to a charge time settling switching circuit.

  Conventionally, when switching the time settling value of the protective relay, a new time settling value is input to the protective relay by local panel operation or remote operation (see Patent Document 1 below).

  For example, the bus connection relay normally operates with a time limit value for alternative protection of about 400 ms for use as an alternative protection due to a failure of each transmission line protection relay installed on each transmission line branched from the bus. In order to test-charge from other buses after an accident, when a busbar breaker is turned on, those that cannot be remotely operated will visit the site each time an operator visits the site, Moreover, what can be remotely operated is switched to a time limit value for trial charging of about 50 ms by an operator remotely.

  In addition, in the equipment protection system at the time of a bus ground fault disclosed in the following Patent Document 2 by the present applicant, a bus communication breaker is used for trial charging from the second secondary bus to the first secondary bus. When turned on, the ground fault overvoltage relay provided on the first or second secondary bus detects a ground fault, and shuts off (opens) the bus bar breaker when the detection time exceeds a predetermined time. As a result, the secondary bus is prevented during the trial charging after the ground fault, and the bus is protected in a short time without cost.

JP 2007-104807 A JP 2007-318862 A

However, in the conventional timed setpoint switching operation, every time the bus bar breaker is turned on for trial charging, an operator goes to the site and operates the local panel to set the time limit for trial charging from the alternative time limit value for protection. Since switching to the value, there was a problem that work was troublesome.
When switching the time settling value by remote control, after transmitting the time settling value switching signal for switching from the time settling value for alternative protection to the time settling value for test charging to the bus connection relay at the start of test charging, test charging At the end, there is a problem that it is necessary to transmit a time settling value switching signal for switching from the time setting value for trial charging to the time setting value for alternative protection to the bus connection relay.

  In addition, in a power system that does not have a bus connection relay, for example, when a trial charge is performed when power is restored during a power outage due to work, a backup protection relay installed on each transmission line (for example, a distance relay) There was a similar problem when switching the time settling value from the time settling value for normal operation to the time settling value for trial charging.

  An object of the present invention is to provide a trial charging time settling switching circuit for a protective relay that can automatically switch a time settling value of a bus connection relay or a rear protection protective relay during trial charging.

The trial charging time setting switching circuit of the protective relay according to the present invention sets the time setting value of the bus connection relay (20) or the back-up protection relay (30) to the time setting value for normal operation when the bus connection breaker is turned on at the time of test charging. Is a trial charging time settling switching circuit (10) of a protective relay for switching to a time setting value for trial charging smaller than the time settling value for normal operation, and a circuit breaker for turning on the bus bar breaker When the signal (S) is input from the outside, the time setting value of the bus connection relay or the backup protection relay is switched from the time setting value for normal operation to the time setting value for trial charging only for a certain time period. Outputs a time settling value switching signal to be instructed, and when the fixed time elapses, sets the time settling value of the bus connection relay or the backup protection relay before the time setting value for trial charging. Characterized by including a timed set point switch control means (12, 13) for outputting the timed setting value switch signal instructing to switch to normal operation timed setting value.
Here, the time settling value switching control means may output the time settling switching signal only when the bus connection relay or the backup protection relay is in operation.
The time limit value for normal operation may be an alternative time set value set for the bus contact relay when the bus contact relay (20) is used as alternative protection.
The backup protection relay may be a distance relay (30), and the normal operation time settling value may be an operation time limit value for each stage other than the one stage operation area time settling value of the distance relay.
By switching from the time settling value for normal operation to the time settling value for trial charging by the circuit breaker turning on signal, the time settling value switching may be completed before the bus bar breaker is turned on.

The test charging time-limit settling switching circuit of the protective relay of the present invention has the following effects.
(1) By providing a timed settling value switching control means, the timed settling of the bus connection relay and the backup protection relay for a certain period after the circuit breaker input signal for turning on the bus connection breaker is input at the time of trial charging. Since the value is set to the time setting value for trial charging, it is possible to automatically switch the time setting value of the bus connection relay or the back-up protection relay at the time of test charging.
(2) Since it is possible to automatically switch the time settling values of the bus connection relay and the rear protection relay at the time of trial charging, it is possible to improve the efficiency of the time settling value switching work.
(3) Since it is only necessary to input a circuit breaker input signal even for a bus connection relay or a backup protection relay that cannot be operated remotely, it is not necessary for the worker to visit the site each time to operate the local panel and switch the timed settling value. Can do.
(4) By setting the time limit value for trial charging for a fixed period after the busbar breaker is turned on, each circuit breaker can be shut off instantaneously even if an accident occurs during this period. Since it is possible to reduce the influence on the device when there is a defect, the influence on the customer due to the instantaneous power failure can be reduced.

It is a figure which shows the structure of the trial charge time limit settling switching circuit 10 of the protection relay by one Example of this invention. It is a figure for demonstrating the structure of the bus-line connection relay 20 incorporating the trial charge time limit settling switching circuit 10 of the protective relay shown in FIG. It is a figure for demonstrating the structure of the distance relay 30 which incorporated the trial charge time settling switching circuit 10 of the protective relay shown in FIG.

  For the above purpose, when a circuit breaker activation signal is input to activate the busbar breaker, the timed setpoint of the busbar connection relay or the back-up protection relay will be trial-charged from the timed setpoint for normal operation only for a certain period of time. This is realized by switching to the time settling value for normal operation and switching the time settling value for the bus connection relay or the backup protection relay from the time setting value for trial charging to the time setting value for normal operation.

Embodiments of a trial charge time-setting settling circuit for a protective relay according to the present invention will be described below with reference to the drawings.
As shown in FIG. 1, a trial charging time settling switching circuit 10 (hereinafter referred to as “trial charging time settling switching circuit 10”) of a protective relay according to an embodiment of the present invention includes an AND circuit 11 and a one-shot. A circuit 12 and a timed settling value switching control circuit 13 are provided.

In the AND circuit 11, for example, a circuit breaker input signal S of a bus connection relay (not shown) input from a remote monitoring control device (not shown) and a protective relay in which a trial charging time limit settling switching circuit 10 is built are operating. The logical product with the in-operation signal U indicating that
Here, the circuit breaker closing signal S is normally at a low level, and is set to a high level upon detection of a circuit breaker closing signal when the bus connection relay is turned on during trial charging.
The in-operation signal U is at a high level while the protective relay is in operation, and is at a low level when the protective relay stops operating due to a failure or the like.

  When a high level output signal is input from the AND circuit 11, the one-shot circuit 12 outputs a high level output signal to the time settling value switching control circuit 13 for a certain time period (for example, about 200 ms).

  When the output signal of the one-shot circuit 12 changes from a low level to a high level, the time settling value switching control circuit 13 outputs a time settling switching signal SW for instructing to switch the time setting value for normal operation to the time setting value for trial charging. When the output signal of the one-shot circuit 12 changes from the high level to the low level, the time setting switching signal SW for instructing to switch the trial charging time setting value to the normal operation time setting value is output.

Next, the bus contact relay 20 having the built-in trial charge time-setting switching circuit 10 will be described with reference to FIG.
As shown in FIG. 2, the bus connection relay 20 includes a trial charging time limit settling switching circuit 10, an arithmetic processing circuit 21, a trip signal generation circuit 22 including a timer 22 a, and a time settling value memory 23.

When the arithmetic processing circuit 21 detects an accident based on the accident current and the accident voltage respectively input from the instrument current transformer and the instrument transformer installed on the bus, the arithmetic processing circuit 21 sends the accident detection signal D to the trip signal generation circuit 22. Output.
Further, the arithmetic processing circuit 21 outputs a high level operating signal U to the logical product circuit 11 of the trial charging time limit settling switching circuit 10 during operation.

When the accident detection signal D is input from the arithmetic processing circuit 21, the trip signal generation circuit 22 interrupts (opens) the circuit breakers (not shown) installed on the bus and the power transmission line branched from the bus. Trip signal T is generated and the generated trip signal T is output to each circuit breaker via timer 22a.
Here, the time settling value of the timer 22a is set to the alternative protection time settling value (= 400 ms) in normal times.

  The time settling value memory 23 stores an alternative protection time settling value and a trial charging time settling value input from the outside.

  In the bus relay 20 configured as described above, when an accident is detected in the arithmetic processing circuit 21 and the accident detection signal D is input from the arithmetic processing circuit 21 to the trip signal generating circuit 22 in a normal state, a trip signal is generated. The circuit 22 generates a trip signal T, and outputs the trip signal T to each circuit breaker unless the accident is resolved within the alternative time limit value for protection (= 400 ms) which is the normal time limit value of the timer 22a. .

When a high level circuit breaker closing signal S is output from the remote monitoring and control device to the bus contact breaker for trial charging, the circuit breaker closing signal S is also input to the logical product circuit 11 of the trial charging time limit setting switching circuit 10. Therefore, when the bus connection relay 20 is in use and a high-level operation signal U is input from the arithmetic processing circuit 21 to the AND circuit 11, the output signal of the AND circuit 11 changes from low level to high. Become a level.
As a result, a high level output signal is output from the one-shot circuit 12 to the time settling value switching control circuit 13 for a fixed time period (= 200 ms), so that the time settling value switching control circuit 13 performs the time setting for alternative protection. A time settling switching signal SW for instructing to switch the value (= 400 ms) to the time setting value for trial charging (= 50 ms) is output to the trip signal generating circuit 22.
The trip signal generation circuit 22 reads out the time setting value for trial charging stored in the time setting value memory 23 in response to the time setting switching signal SW, and uses the time setting value of the timer 22a as the time setting value for alternative protection. To the time settling value for trial charging.
As a result, it takes about 0.1 s after the circuit breaker closing signal S is input until the bus bar breaker is actually turned on, so that the timed setpoint switching can be completed before the bus bar breaker is turned on. it can.

During this time, when an accident is detected in the arithmetic processing circuit 21 and the accident detection signal D is input from the arithmetic processing circuit 21, the trip signal generating circuit 22 generates a trip signal T, and the generated trip signal T is used as a timer. It outputs to each circuit breaker after the time limit value (= 50 ms) for trial charge passes via 22a.
Thereby, even if an accident occurs during trial charging, each circuit breaker can be instantaneously interrupted by the bus connection relay 20.

When a certain time period (= 200 ms) elapses, the output signal of the one-shot circuit 12 returns from the high level to the low level, so that the time settling value switching control circuit 13 substitutes the time limit value for trial charging (= 50 ms). A time settling switching signal SW instructing to switch to a protective time settling value (= 400 ms) is output to the trip signal generating circuit 22.
In response to the time settling switching signal SW, the trip signal generating circuit 22 reads the alternative time limit set value stored in the time set value memory 23, and uses the time set value of the timer 22a as the time set value for trial charging. Switch to alternative protection time settling value.
As a result, the time setting value for trial charging can be automatically switched to the time setting value for alternative protection, so the time setting value switching signal from the time setting value for trial charging to the time setting value for alternative protection at the end of test charging Is not required to be transmitted from the remote monitoring control device or the like to the bus connection relay 20.

Next, the distance relay 30 with the built-in trial charge time-setting switching circuit 10 will be described with reference to FIG.
The distance relay 30 is of a three-stage distance relay type. For example, for an accident in the first protection section (one-stage operation area) up to 80% of the transmission line in which the distance relay 30 is installed. It is set to shut off the transmission line breaker after the 1st stage operating range settling value (for example, 50 ms) has elapsed, and 2 for an accident in the second protection section (2nd stage operating range) up to 150% of the transmission line. It is set to shut off the transmission line breaker after the stage operating range settling value (for example, 400 ms) elapses, and the third stage for an accident in the third protection section (3-stage operating range) up to 300% of the transmission line By setting so that the power line breaker is shut off after the operating range set value (for example, 1.5 s) has elapsed, distance setting and timed setting are coordinated with the distance relay for protecting the next section power line. It shall be.

As shown in FIG. 3, the distance relay 30 includes a trial charge time settling switching circuit 10, an arithmetic processing circuit 31, a trip signal generation circuit 32 including _{first to third} timers 32 a _{1 to} 32 a ₃ , a time limit, And a settling value memory 33.

The arithmetic processing circuit 31 detects an accident in the one-stage operation region based on an accident current input from an instrument current transformer installed on a transmission line and an accident voltage input from an instrument transformer installed on a bus. then outputs a first fault detection signal D ₁ to the trip signal generating circuit 32, and outputs the detected an accident a second fault detection signal D ₂ to the trip signal generating circuit 32 in the two-stage operation region, three stages operating range When an accident at is detected, a third accident detection signal D ₃ is output to the trip signal generation circuit 32.
Further, the arithmetic processing circuit 31 outputs a high level operating signal U to the logical product circuit 11 of the trial charging time limit settling switching circuit 10 during operation.

When any one of the _{first to} third accident detection signals D _{1 to} D ₃ is input, the trip signal generation circuit 32 generates a trip signal T for breaking the power transmission line breaker.
Further, when the first accident detection signal D ₁ is input, the trip signal generation circuit 32 outputs the trip signal T to the power transmission line breaker via the first timer 32a ₁ and the second accident detection signal D. If ₂ is input a trip signal T is output to the second transmission line breakers through the timer 32a _2, the third fault detection signal D ₃ is inputted a trip signal T third timer 32a ₃ To the power line breaker.
Here, the time settling values of the _{first to} third timers 32a _{1 to} 32a ₃ are, as usual, a one-stage operation range time settling value (= 50 ms), a two-step operation range time settling value (= 400 ms), and three steps The operating range is set to the time limit settling value (= 1.5 s).

  The time settling value memory 33 stores a one-stage operation range time settling value, a two-step operation range time settling value, a three-step operation range time settling value, and a time limit value for trial charging that are input from the outside.

In distance relay 30 thus constructed, in the normal, first to third in the timer 32a ₁ ～32A ₃ 1-stage operation region timed setting value (= 50 ms), 2-stage operation region timed setting value (= 400 ms ) And the three-stage operation area time-limit set value (= 1.5 s), and the arithmetic processing circuit 31 detects an accident in the first-stage operation area, the two-stage operation area, or the three-stage operation area, and performs arithmetic processing. When the first accident detection signal D ₁ , the second accident detection signal D ₂ or the third accident detection signal D ₃ is input from the circuit 31, the trip signal generation circuit 32 generates a trip signal T, The generated trip signal T is set via the first timer 32a ₁ , the second timer 32a ₂ or the third timer 32a ₃ to the one-stage operation area set value, the two-stage operation area time-set value, or the three-stage operation area time-set value. Outputs to the power line breaker after the value has elapsed.

When a high level circuit breaker closing signal S is output from the remote monitoring and control device to the bus contact breaker for trial charging, the circuit breaker closing signal S is also input to the logical product circuit 11 of the trial charging time limit setting switching circuit 10. Therefore, when the distance relay 30 is in use and the high-level operation signal U is input from the arithmetic processing circuit 31 to the AND circuit 11, the output signal of the AND circuit 11 changes from the low level to the high level. It becomes.
As a result, a high level output signal is output from the one-shot circuit 12 to the time settling value switching control circuit 13 for a fixed time period (= 200 ms), so that the time settling value switching control circuit 13 has a two-stage operating range time limit. A time settling switching signal SW for instructing to switch the settling value (= 400 ms) and the three-stage operation time limit setting value (= 1.5 s) to the time setting value for trial charging (= 50 ms) is output to the trip signal generation circuit 32 To do.
The trip signal generation circuit 32 reads the time limit values for trial charging stored in the time settling value memory 33 in response to the time settling switching signal SW, and the second and third timers 32a ₂ and 32a ₃ The time settling value is switched from the two-step operation range time settling value and the three-step operation range time settling value to the time limit value for trial charging.
As a result, it takes about 0.1 s after the circuit breaker closing signal S is input until the bus bar breaker is actually turned on, so that the timed setpoint switching can be completed before the bus bar breaker is turned on. it can.

During this time, when the arithmetic processing circuit 31 detects an accident in the two-stage operation region or the three-stage operation region, and the second accident detection signal D ₂ or the third accident detection signal D ₃ is input from the arithmetic processing circuit 31. The trip signal generation circuit 32 generates a trip signal T, and the generated trip signal T is passed through the second timer 32a ₂ or the third timer 32a ₃ after the time limit value for trial charging (= 50 ms) has elapsed. Output to power line breaker.
During this time, when an accident in the one-stage operation region is detected by the arithmetic processing circuit 31 and the first accident detection signal D ₁ is input from the arithmetic processing circuit 31, the trip signal generating circuit 32 outputs the trip signal T. And the generated trip signal T is output to the power line breaker after the first stage operating region time settling value (= 50 ms) has elapsed via the first timer 32a ₁ .
Thereby, even if an accident occurs in the 1st stage operation region, the 2nd stage operation region, or the 3rd stage operation region during the trial charging, the transmission line breaker can be instantaneously interrupted by the distance relay 30.

When a certain time period (= 200 ms) elapses, the output signal of the one-shot circuit 12 returns from the high level to the low level, so that the time settling value switching control circuit 13 sets the time limit value for trial charging (= 50 ms) to 2 A time settling switching signal SW is output to the trip signal generating circuit 32 for instructing to switch to a stage operating range time settling value (= 400 ms) and a three stage operating range time settling value (1.5 s).
The trip signal generation circuit 32 reads out the two-stage operation area time settling value and the three-stage operation area time settling value stored in the time settling value memory 33 in response to the time settling switching signal SW, and outputs the second and second The time setting values of the timers 32a ₂ and 32a ₃ are switched from the time setting value for trial charging to the time setting value for the two-stage operation area and the time setting value for the three-stage operation area.
As a result, the time setting value for trial charging can be automatically switched to the time setting value for the two-stage operation area and the time setting value for the three-stage operation area. It is not necessary to transmit the time settling value and the time settling value switching signal to the three-stage operating range time settling value from the remote monitoring control device or the like to the bus connection relay 20.

In the above description, the one-shot circuit 12 is used only for a fixed time period when the output signal of the AND circuit 11 that takes the logical product of the circuit breaker closing signal S and the operating signal U changes from the low level to the high level. Although a high level output signal is output, since the operating signal U is for fail-safe operation, a high level output signal is output only for a certain period of time when the high level circuit breaker closing signal S is input. You may make it output.
Further, although the distance relay 30 is taken as an example of the back-end protection relay, the same effect can be obtained by incorporating the trial charge time settling switching circuit 10 into a ground fault direction relay or the like used for back-end protection.

DESCRIPTION OF SYMBOLS 10 Test charge time settling switching circuit 11 AND circuit 12 One shot circuit 13 Time settling value switching control circuit 20 Bus line connection relay 21, 31 Arithmetic processing circuit 22, 32 Trip signal generation circuit 22a Timer 23, 33 Time settling value memory 30 Distance Relays 32a _{1 to} 32a ₃ First to third timer SW Timed set value switching signal S Breaker closing signal T Trip signal U In-operation signal D Accident detection signal D _{1 to} D ₃ First to third accident detection signal

Claims (5)

For trial charging, the time setting value of the bus connection relay (20) or the back-up protection relay (30) is smaller than the time setting value for normal operation from the time setting value for normal operation when the bus connection breaker is turned on during the test charging. A trial charge time settling switching circuit (10) of a protective relay for switching to a time settling value,
When a circuit breaker closing signal (S) for turning on the bus bar breaker is input from the outside, the time settling value of the bus bar relay or the backup protection relay is set for the normal operation time limit only for a certain period of time. A time settling value switching signal for instructing to switch from a value to the time limit value for trial charging, and when the fixed time period elapses, the time setting value of the bus connection relay or the backup protection relay is set to the time limit value for trial charging. A time limit set value switching control means (12, 13) for outputting a time settling value switching signal for instructing switching from the set value to the time set value for normal operation is provided. Settling switching circuit.   2. The protection relay test device according to claim 1, wherein the time settling value switching control means outputs the time settling switching signal only when the bus connection relay or the backup protection relay is in operation. Charge time setting switching circuit.   3. The time limit value for normal operation is an alternative time set value set for the bus contact relay when the bus contact relay (20) is used as an alternative protection. Test charging time limit settling switching circuit for the described protective relay. The rear protection relay is a distance relay (30);
The time settling value for normal operation is a time settling value for each stage operating range other than the one stage operating range time settling value of the distance relay,
The trial charging time limit settling switching circuit of the protective relay according to claim 1 or 2, characterized in that.   By switching from the time settling value for normal operation to the time settling value for trial charging by the circuit breaker turning on signal, the time settling value switching is completed before the bus bar breaker is turned on, A trial charge time settling switching circuit for a protective relay according to claim 1 or 2.

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