JP2644987B2 - Direction comparison relay - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a direction comparison relay system, and more particularly to a pause which can facilitate the finding of a fault point when incorporating a faulty end into a live system. The present invention relates to a direction comparison relay system having an automatic edge detection circuit.

[Technical background and problems of the invention]

In general, in the direction comparison relay system using a transport protection relay, when a fault occurs in a section, a trip allowance signal is transmitted to the opposite end using the conditions of the operation of the failure detection relay and the operation of the failure direction detection relay. Are sent to each other, and only when these conditions are mutually established, it is determined that an in-section failure has occurred and the failed section is tripped. Therefore, when one end is stopped due to system circumstances, it is necessary to create a circuit condition indicating that the end is stopped on the stop end side, and to plan malfunction prevention. And on the idle end side, as transmission conditions,
Utilizing the fact that the circuit breaker or disconnector is opened and the bus and the track are separated, the own end is set as a stop condition of a stop state.
Also, for the following reasons, the pause condition is similarly used when there is no PT voltage.

FIG. 1 is an explanatory diagram of a case where a suspended system in which an internal failure is present is incorporated into a live system. In addition, even if a fault occurs during a pause, the relay device cannot detect it because there is no input signal (voltage, current), and when the system is incorporated without notice of a system accident or when the system is incorporated An accident may occur. In FIG. 1, and was charged with breaker 2A of the A end in a state where the accident inherent in F ₁ point of the transmission line 1. The power supply 3 is provided behind the A-end, but there is no power supply behind the B-end, and the power supply 3 is not provided. The breaker 2B at the B end is A
It is assumed that the circuit is already closed before the circuit breaker 2A at the end is turned on. Therefore, when the circuit breaker 2A at the A end is turned on, a fault current flows from the power source 3 behind as shown by the arrow, and A
The internal detecting element of the protection relay device 4A at the end operates to send a trip permission signal to the opposite terminal B and to make a trip plan at the end. On the other hand, since no fault current flows at the opposite end B, the internal / external direction detection relays do not operate. In addition, since both the circuit breaker and the disconnector remain closed, neither the transmission of the trip permission signal nor the intention of the trip at the own end is possible. (The non-power-supply carrier signal return circuit at the B terminal is normally locked because the undervoltage relay has been operating for a long time, and is invalid in the case of FIG. 1).
Thus the end A when the trip allowable signal is not emitted from the B end becomes impossible carrier trip, F ₁ point clearing will be clearing supposed to leave the backup protection of the A end is delayed. Therefore, the carrier without the PT voltage usually controls the carrier to the trip allowable side under the condition of the undervoltage relay operation. Although the B-end of the non-power end by the control can not trip, A which the supply end internal faults F ₁ becomes trip possible is removed.

FIG. 4 shows a self-end stop detection circuit. The timer 7 is driven by the logical sum of the pallet condition 5 of the circuit breaker and the pallet condition 6 of the disconnector, and the auxiliary relay 8 is driven by the normally open contact 7a of the timer 7. . The timer 10 is driven by the contact 9 of the undervoltage relay that closes when there is no PT voltage, and the auxiliary relay 11 is driven by the normally open contact 10a of the timer.

FIG. 5 shows a transmission circuit of the self-end stop condition. SP-SN is a control terminal of the communication set. When the terminals are short-circuited, the transmission signal is controlled to the trip permitting side, and when released, the transmission signal is controlled to the trip preventing side. Then the normally closed contact 12b for resting end communication control breaker, the control terminals SP-SN communication set is controlled by a normally open contact 8a _1, 11a ₁ of the own end resting detection relay by disconnecting switch or undervoltage relay You.

On the other hand, in the pause end transmission control circuit of FIG. 6, the timer 12 is driven by the normally open contacts 8a ₂ and 11a ₂ of the self end pause detection relay. The normally closed contact 12b of this timer is used in the communication set control circuit shown in FIG.
Is driven. Further, the auxiliary relay 14 is driven by the normally open contact 13a of the timer 13. The normally open contact 14a of the auxiliary relay 14 is used for self-holding, and the normally closed contact 14b is used for releasing the excitation of the timers 12 and 13.

These responses are shown in the time chart of FIG. Seventh
Although the figure shows the waveform of the transmission signal when the circuit breaker or disconnector is opened, the same transmission signal waveform is obtained under the condition of detecting and responding to the absence of the PT voltage.

That is, when the circuit breaker or disconnector is opened or no PT voltage is present, either the timer 7 or the timer 10 operates,
Control terminals SP-SN in FIG. 5 shown after timed t ₁ they have
The transmission signal is trip-allowed. The allowable signal is transmitted between timed t ₂ timer 12, after once being controlled by timed t ₃ of the timer 13 is again controlled to the allowable side blocking side, breaker, disconnector is turned, moreover established PT voltage Until it is controlled to the allowable side. Therefore, in FIG.
Even the B terminal in F ₁ failure has breaker and disconnector are both on, the transmission signal since the continued PT voltage without detection becomes trip allowable side, A terminal is adapted to be carrier trip instantaneously . If the transmission signal is not controlled to the trip allowable side due to the absence of the PT voltage, the transmission signal is prevented from being tripped because the circuit breaker and disconnecting switch on the B side are turned on, and the A end cannot perform carrier trip. Therefore, a timed trip due to the A-end protection is expected, and the elimination of the fault is extremely delayed.

Next, referring to FIG. 2, a description will be given of a response in a case where an external failure exists at the end B. The external fault F ₂ of FIG. 2, such as illustrated arrows fault current flows from behind the power of the A-end, the internal sensing element of the protective relay device 4A of the A end to work first
This is the same as in the case of FIG.

On the other hand, at the B end, the fault current flows out as shown by the arrow in the figure, so that the external direction detecting element operates. However, the undervoltage relay 9 for detecting no PT voltage continues to operate before the circuit breaker 2A at the A end is turned on. And the transmission signal remains controlled on the trip-allowing side. Therefore, the A-end determines that an internal failure has occurred and performs a carrier trip.

Figure 3 shows the case where the rest system is the incorporation by the operation of the breaker 2C outside section, a failure in the external F ₂ of B end is inherent, A ends, the interior of the B-end, external direction detection The elements respond in the same manner as in FIG. 2, and the breaker 2A at the A-end carries out a carrier trip. In each of these cases, if the trip is determined as an internal failure, in the work of utilizing the transmission line after finding and repairing the failure location, it will take considerable time to find the failure location. .

[Object of the invention]

The present invention has been made to solve the above-mentioned problems, and it is possible to make a trip when an in-segment fault is inherent in joining a hibernated system to an active system, and to make a trip when an out-of-segment fault occurs. It is intended to provide a direction comparison relay system for operation.

[Summary of the Invention]

In the present invention, when the own-end circuit breaker or disconnector is open, or when the operation of the under-voltage relay detects the voltage shortage of the own end, the pause detecting that the own end is paused. An end detection circuit (FIG. 4) and a transmission circuit (FIG. 8, FIG. 8) for transmitting a trip allowance signal to the relay device at the opposite end when the pause end detection circuit detects the pause, assuming that the own end is in the pause state. In the direction comparison relay device provided with the contacts 8a1 and 11a1 of FIG. 10), when the external directional relay at its own end operates when the inactive line is merged with the already active system, The transmission of the trip permission signal to the opposite end relay device by the pause end detection circuit of the pause end detection circuit is canceled (release function), and the transmission is switched to the trip prevention signal (switching control function). Transmission control circuit (the eighth Contact points 15 and 16 in figures and Fig. 10)
It is provided with. Then, when the hibernated system is incorporated into the active system, if a fault is present outside the protection section of the transmission line, the carrier control by the undervoltage relay is prevented by the response of the external direction detection element, and the internal fault is present. It is intended to make a trip only in a case.

(Example of the invention)

Embodiments will be described below with reference to the drawings. FIG. 8 is a block diagram of an embodiment of a transmission signal control circuit applied to the direction comparison relay system according to the present invention. In FIG. 8, components having the same reference numerals as those in FIG. 5 have the same or equivalent functions.

In this embodiment, in order to save the number of lines (the number of channels) of the communication device, a signal indicating whether or not one signal (between the control terminals SP and SN) can be transmitted on one channel indicates trip prevention / trip permission. The circuit shown in FIG.
Explanation will be given with an example applied to the end.

In FIG. 8, reference numeral 15 denotes a normally closed contact of a short-circuit external detection element that operates due to an external short-circuit fault, and reference numeral 16 denotes a normally-closed contact of a ground fault external detection element that operates due to an external ground fault. connects further the dormant carrier signal controlling contacts 12b, circuit breaker, the prior art circuit of contacts 11a ₁ which is closed by a no contact 8a ₁ or PT voltage closing the opening of the disconnector. Therefore, the circuit that sends the self-end pause condition is short-circuited,
The control is performed by the normally closed contacts 15 and 16 of each of the external detection elements of the ground fault, so that even when the undervoltage relay continues to operate when an external failure occurs, it is possible to reliably transmit the inhibition signal. That is, in FIG. 8, even if the contact 11a1 of the undervoltage relay is closed, _one of the normally closed contacts 15, 16 of the external detection element is opened, and the SP-SN of the transmission signal control circuit is opened. This is to enable transmission of a blocking signal.

According to the time chart of FIG.
The relationship with the end trip will be described.

FIG. 9 (a) shows the response in the case of the internal failure shown in FIG. In this case, the fault point F ₁ is an internal direction detection element of the end A is operated for in the protection zone. On the other hand, at the B end, the external direction detecting elements 15 and 16 are both kept closed, and the short circuit continues between the SP and SN of the transmission signal control circuit. At the terminal A, a logical product condition of the operation of the internal direction detecting element and the reception of the permissible signal is satisfied, and carrier trip is enabled.

FIG. 9 (b) shows the response in the case of the B-end external failure shown in FIGS. 2 and 3. In this case, the fault point F ₂ is out protection interval, current from the A end to flow toward the inside, an internal direction detection elements of A end becomes operational. On the other hand, at the B end, either the normally closed contact 15 or 16 of the external direction detecting element operates, and the SP-SN of the transmission signal control circuit is opened, and a blocking signal is transmitted. Therefore, although the internal direction detecting element operates at the end A, no trip command is issued by receiving the inhibition signal. It goes without saying that the coordination between the operating speed and the sensitivity of the internal direction detecting element and the external direction detecting element is naturally taken as the basis of the direction comparison method.

FIG. 10 is a block diagram of another embodiment of a transmission signal control circuit applied to the direction comparison relay system according to the present invention. In FIG. 10, 17 is a normally open contact of the inward short-circuit fault detecting element, 18 is a normally-open contact of the inward ground fault detecting element, and 19 is a normally closed contact that operates only at the time of a short-circuit fault to realize short-circuit priority. ,
Other configurations are the same as those in FIG. As can be seen from the figure, it shows that the conventional direction comparison relay system can be easily handled.

In short, any circuit that can prevent the condition for controlling the carrier without the PT voltage by responding to the external detection element can be applied in various modified forms.

〔The invention's effect〕

As described above, according to the present invention, when incorporating a dormant system into an active system, if a fault is present outside the section of the transmission line, a carrier control signal by an undervoltage relay is provided by an external direction detection element. In the event that a fault is inherent in the dormant system, carrier trips in each section can operate only due to internal faults, enabling quick fault recovery without erroneous fault point determination. It is possible to provide a direction comparison relay method that can be performed.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram in the case of incorporating a suspended system in which an internal failure is present in a live system, and FIGS. 2 and 3 are explanatory diagrams in a case of incorporating a suspended system in which an external failure is present. FIG. 4 is a circuit diagram of a self-end pause detection circuit, FIG. 5 is a transmission circuit diagram of a self-end pause condition, FIG. 6 is a pause end transmission control circuit diagram, FIG. 7 is a time chart for explaining operation, and FIG. 10 is a block diagram of an embodiment of a transmission signal control circuit applied to the direction comparison relay system according to the present invention, and FIG. 9 is a time chart for explaining the operation. 1 ... transmission line, 2A, 2B ... breaker 3 ... power supply, 4A, 4B ... protection relay device 5 ... pallet switch of breaker 6 ... pallet switch of relay 7,10,12, 13 …… Timer 8,11,14 …… Auxiliary relay

Continuation of front page (56) References JP-A-54-153253 (JP, A) JP-A-55-160928 (JP, A) JP-A-58-36124 (JP, A) JP-A-55-150725 (JP) , A) Tokugyo Sho 51-3063 (JP, B1) Masami Okada, Koji Ota "Relay Practice Series 2 Protection System for Transmission and Distribution Lines" (Showa 51-1-25) Denki Shoin 62

Claims (1)

(57) [Claims] When a self-terminal breaker or disconnector is open, or when a voltage shortage of the self-terminal is detected by an operation of an undervoltage relay, it is detected that the self-terminal is inactive. In the direction comparison relay device including a pause end detection circuit and a transmission circuit that transmits a trip allowance signal to the relay device at the opposite end when the pause end detection circuit detects the pause and determines that the own end is paused, When the external directional relay at its own end is operated when merging a suspended line into a system that is already active, when the pause end detection circuit detects a pause end, the trip allowance signal to the opposing terminal relay device is transmitted. A direction comparison relay device, comprising: a transmission control circuit for canceling transmission, switching control to transmission of a trip prevention signal, and preventing a trip operation of the opposing end relay device.