JPS58157322A - Carrier protecting relay unit - 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 relates to a transportation protection power distribution device for protecting an electric power system, and in particular to a transportation protection device that improves the operating rate of the device by improving inspection means. Regarding relay devices.

[Technical background of the invention]

Conventionally, there are various types of relay devices that protect power systems, but in current differential FM carrier protection relay devices, F
A transmission method using the M modulation method (frequency modulation method) mutually transmits and collects the instantaneous values of the currents at each terminal, and the sum of the currents becomes zero in the case of an external failure or normal operation, for example, and the relay does not operate. In the case of an internal failure, a current corresponding to the failure point flows and the relay operates.

Figure 1 shows a general schematic configuration when a two-terminal power system is protected by this type of relay. ing. On the A power station side, the protective relay device is connected to mother 11.
J, current transformer xk, FM differential relay 1101, its input converter and determination circuit 11, transmitter 112, receiver 11
3, a carrier end station device 120, and a wireless device 130 as shown in the figure. On the other hand, on the B electric Wr side, similarly, the main IB, the current transformer 7B, the FM differential voltage generator 2101, its input converter and the judgment (b) path 211, the transmitting section 212, the receiving section 21S1, the carrier end station device J J O , a wireless device 240 as shown in the figure.

In the configuration shown in FIG. 1, when an internal failure occurs in the power transmission line S, the transmission section 11 of the FMM moving relay 110
After the self-end current is FM modulated, the carrier end station device 12
0, and is transmitted from the wireless device 136 to the other end. A high frequency signal corresponding to the current at the other end transmitted from the other end is demodulated by the receiving section 111 and introduced into the determination circuit 111 . In this determination circuit 111, 11+1. If the relationship ≧K: constant is established, the FMM dynamic relay 110 operates.

FIG. 2 shows the configuration of the FMM dynamic relay 110 in block form (one phase).

In Fig. 2, 11 is the self-end CT secondary current, 12°J
5, 22 is an isolation transformer, 13 is an input filter, 16
14 is an FM modulation circuit, 2 is a carrier end station device, 2S is an FM demodulation circuit, 24 is a demodulation filter, SL is a summation circuit, 32 is a judgment circuit, 41b is an open-circuit operation during inspection 62a is a contact of an auxiliary relay 52 (not shown), and 62a is a normally open contact that measures the simulated inflow at one end.
52 BL e 52b is also a normally closed contact, 61 is a check circuit, 611& is a normally open contact that is closed when the self-end equivalent check input is applied, 611! * is a normally open contact that is closed when the opposite end equivalent inspection input is applied, 61m.

63m is a normally open contact for inspection input control, 42b and 43b are normally closed contacts, and OR7, ORJ, and ORJ are OR circuits.

With the above configuration, the self-end CT secondary current passes through the input filter 13, and the self-end transmission delay compensation circuit 16 compensates for the transmission delay, and the normally closed contact gzb.

62b1 is led to the sum circuit 31 via the OR circuit OR2. At the same time, the signal is FMfpl by the FM modulation circuit 14, becomes a high frequency signal, and is transmitted to the other end via the normally closed contact 41b1 and the carrier end station device 21.

9. The high frequency signal from the other end passes through the carrier end station device 21, the normally closed contact 51bl, and the OR circuit 0ELI to the FM
It is converted into a plow frequency by the demodulation circuit 2S. This FM
The demodulated wave is input to the sum circuit J1 via the demodulation filter 24 and the normally closed contact 63b1 OR circuit ORJ. In the sum circuit J1, the vector sum of the current signal at its own end and the current signal at the other end is calculated, but it is theoretically a zero (actually only a whirring fault current) in normal times or in the event of an external fault, and it is a vector sum in the case of an internal fault. The amount corresponds to the current flowing at a point. The determination circuit J2 operates when the output of the sum circuit 31 exceeds a certain value or when the ratio of the inflow current to the outflow electricity exceeds a predetermined value.

In addition, generally FM electric current difference vertical joint 11Lkc setting g! It has an inspection function to improve reliability. Figure 2 shows an FMM style differential relay with a conventional inspection function. This inspection function is available at both Mu Electric Station and B Electric Station.
Here, electric station A will be explained as an example.

In FIG. 2, inspection of the FMM dynamic relay 110 will be explained. For inspection, simulate the own end type R or the opposite end current, and check the I shown in Figure 3 depending on the magnitude of these two electrical quantities.
Zoshi Seal A, B.

Perform inspections at C, D, and E. In addition, Fig. 3 shows the ratio characteristics of the FMM dynamic relay 110, where the horizontal axis is the own end current (inflow), the vertical axis is the other end type fi (outflow), and the shaded area is the operating range. .

Here, the reason for having ratio suppression as shown in Fig. 3 is that when an external failure occurs, the current transformer (C
T) Since the amount of operation becomes non-zero due to the increase in error current due to JA and JB errors, this is to avoid malfunctions due to this, and by adding a suppression amount corresponding to the magnitude of the inflowing current. can get. Furthermore, the reason for the curved line characteristic is to provide high sensitivity in a small current range.

Inspection position A is simulating inflow at one end and the current at its own end is 1 zero.
Then, a switch (not shown) switches from the secondary side of the quality control device 11 to an inspection input signal MI circuit (not shown), and an inspection input of a predetermined magnitude is applied to simulate the operation. Next, for the inspection scenes B and C, set the self-end current to 1 zero, and as the other side current changes /?) simulate the operating side of scene B with the minimum operating value, and simulate the non-operating side of scene C. /signals D and E set the current at their own end to a certain constant value, and change the magnitude of the current at the other end.Position D is on the operating side of the ratio characteristic, and -position E is on the non-operating side of li1. Perform a simulation.Then, the inspection order is A-
The inspection circuit is configured so that +B-+ (: -+ l)→E.

In FIG. 2, when the inspection is started, the auxiliary relay 41 (not shown) is operated and its contact 4Jb is opened. Therefore, the output of the vyfWs circuit 14 is no longer transmitted to the expansion partner end. Since the transmission is interrupted and the bell is cut off, the receiving signal is cut off at the opposite end. That is, in order to prevent unnecessary response of the relay at the other end during inspection of the relay at the own end, the transmission signal is cut off (lock signal sent), thereby automatically locking the other end. Further, the circuit is configured such that the lock at the other end is released when the automatic inspection is completed. On the other hand, yy*l
The output of the 111 circuit 14 is the a contact 6 which is open at one end when the inflow occurs.
2a1 OR circuit ORJ, own end FM demodulation circuit 21
be led to. When the auxiliary relay 52 is driven, it is switched to input the output of the fW14 circuit 14 at its own end from the FM wave transmitted from the other end.

Furthermore, by forcibly dividing the self-end current to zero and applying it to the summation circuit 31 and the judgment circuit 32, the multi-operation is confirmed by simulating one-end inflow at inspection position A. .

Next, when the ratio characteristic inspection is started, the auxiliary relay 62.
63 operates, and its contact 62b.

63b is open and contacts 62m and 6ja are closed. Next, close the contacts 611m and 612*, and check the inspection circuit 61.
Inspection inputs for the current at the own end and the equivalent current at the other end are applied. The own-end Osho current passes through contacts 611m and 62h, and the OR circuit ORJ, and the current equivalent to the other end passes through contacts 612m and 62h.
61m, and are introduced into the sum circuit S1 via the OR circuit ORJ. In the summation circuit S1, the vector sum of these two electrical quantities is determined, and a determination circuit S2 determines whether it is operating or not.

[Problems with background technology]

The above is a general explanation of the conventional FM current differential relay system, but the inspection method for such a relay system is to conduct an inspection at each electrical station by simulating the current equivalent to the other end, and During inspection,
In order for the other end to react unnecessarily due to the inspection current at the own end, it is necessary to send a lock signal to the other end from the start to the end of the own end inspection. Therefore, when a failure occurs during inspection,
A problem arises in that the operation of the relay at the other end is always delayed during inspection. In addition, the FM relay device has a constant monitoring function, and if it is not needed for a certain period of time, it is determined that the device is defective. In other words, as mentioned above, during the self-end relay inspection, the F of the other end is
In order to cut off the M transmission level, one of the constant monitoring functions, Lok-Li (a function that monitors the level of received FM waves), detects a defect, so the constant monitoring time is lengthened. This poses a major problem in quickly discovering device defects.

[Purpose of the invention]

The present invention has been developed to solve the above-mentioned problems, and its purpose is to reduce the locking time of the other end relay during self-end inspection, and to improve the operation rate of the device. Our purpose is to provide a training relay device.

[Summary of the invention]

In order to achieve the above object, the present invention transmits a variable wave modulated with an electrical quantity signal extracted from a power system pile to an opposing electric station via a transmission system, and receives this transmitted signal. At each of the above-mentioned electrical stations, the self-terminal relay is used in a conveyor protection relay system that inputs the demodulated signal of the self-terminal signal and the received signal from other terminals to the relay determination section to determine the fault section of the upper distribution power system. A feature [Embodiment of the invention] characterized in that the locking time of the mating terminal relay is significantly reduced by providing an inspection function that sends a lock signal to the mating terminal only when simulating inflow at one end during inspection. An embodiment of the present invention shown in the drawings will be described. The line in FIG. 4 is a block diagram of a configuration example of the FM differential relay (for one phase) according to the present invention, and the same parts as in FIG. In Fig. 4, the difference from the conventional device shown in Fig. 2 is that the normally closed contact 4Jb, which continues to operate from the start of the inspection to the end of the inspection, is removed in advance, and instead operates when simulating an inflow at one end. This is because a normally closed contact 51bs of the auxiliary relay 52 is provided.

Next, inspection based on the configuration shown in FIG. 4 will be explained. In this case, completely similar devices are arranged at both terminals, but electric station A will be explained here.

First, when an inspection is carried out now, the auxiliary relay j2 (not shown) is operated after the trip lock is confirmed g, and one end is made when simulating an inflow. A contact Jjjm of the auxiliary relay 62 is closed,
bfi' points 52 bl, 52b,.

52b is opened. When this contact 52b3 is opened, no transmission occurs. By cutting off the transmission signal (sending a lock signal), the output section of the FM relay 210 at the other end is automatically locked.In such a state, the check input application circuit (not shown) When a predetermined inspection current is applied to the secondary side of the current flow device 1, this inspection input is guided to the own-end transmission delay compensation circuit 16 and the FM modulation circuit 14 via the input filter 3. In the former output, when the contact 52b is open, the self-end current is zero. Further, the latter FM modulation circuit 14 is opened at the contact 52bs as described above for transmission to the other end. On the other hand, the output of the FM modulator 13 is closed and guided to the FM demodulation circuit 23 at its own end via the nine-contact 52a1 OR circuit ORI. When the auxiliary relay 52 is driven, the contact 52bl is opened, so that the FM demodulation circuit 230 inputs the output of the FM modulation circuit 14 at its own end from the FM wave transmitted from the other end. FM demodulation circuit 23
Output L1 demodulation filter 24, contact 63b1 OR circuit O
After passing through the RJ, vectors are combined in the sum circuit S1 and judged in the judgment section 32, and once the inflow simulation inspection is completed, the next step is to inspect the ratio characteristics. At this time, the auxiliary relay 52 that was operating during the single-end flow simulation is de-energized, and all contacts are restored.

Next, when the inspection of the ratio characteristics starts, the auxiliary relay ix
, ix are operated, contacts gJb and 6iJb are opened, and contact 6 J a @ 63 m is closed.

When this contact izb is opened, it becomes irrelevant to the secondary side input of the current transformer 11, and no unnecessary output is given to the transmission signal to the other end.

Furthermore, by opening the contact gSb, the FM wave from the opposite end is made irrelevant, and inspection inputs of the current equivalent to the own end and the current equivalent to the opposite end are applied to the inspection circuit 6 at the end of the eye. As a result, the current equivalent to the current at the own end is passed through the contacts 611*, 6j a, and the OR circuit ORj t"H, and the current equivalent to the other end is sent to the contact 612.
&e63&s After the OR circuit OR3, each sum circuit 3
1, vector synthesis is performed in the sum circuit, and judgment is made in the judgment circuit J2.

In this way, in the FM current differential relay system, the F
When inspecting the M relay, a lock signal is sent to the other end, and when the own end relay is inspected, an unnecessary signal is sent to the other end. Since it is equipped with an inspection function that sends out signals only when simulating one end flow type, it is possible to reduce the locking time of the other end relay by not sending a lock signal during ratio characteristic inspection, thereby increasing the operating rate of the equipment. It can be greatly improved.

In addition, although the above explanation deals with the case of a two-terminal system,
It is possible to implement even a multi-terminal system with three or more terminals. Further, although the case where the present invention is applied to an FM differential relay device has been described, it goes without saying that it is also possible to apply the present invention to a PCM differential relay system and the like.

〔Effect of the invention〕

As explained above, according to the present invention, an inspection function is provided that sends a lock signal to the other end only when simulating inflow at one end when inspecting the relay at its own end. It is possible to provide an extremely reliable transport protection relay device that can reduce the locking time of the end relay and increase the operating rate of the device.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing the system configuration of the FM differential relay device, Fig. 2 is a block diagram showing the FM differential relay, Fig. 3 is a diagram showing the ratio characteristics of the FM differential relay, and Fig. 4 is a diagram showing the ratio characteristics of the FM differential relay. FIG. 1 is a configuration diagram showing an embodiment of the present invention. JA, JB... Bus bar, 2 people, Jil... Current transformer, 3
...Power transmission line, 110,210...FM differential relay,
12.11,11...Isolation transformer, IJ...FM
Demodulation circuit, 24... Demodulation filter, Sl... Sum circuit, J2... Judgment circuit, 61... Inspection circuit, 13...
・Input filter, 14...FM modulation circuit, 16...
Transmission delay compensation circuit, I J O * J J O... Carrier terminal equipment.

Claims (1)

[Claims] The modulated wave modulated by the electrical quantity signal extracted from the power system is transmitted to the opposite electric station via the transmission system, and the electric station that receives this transmitted signal receives the Hiroji terminal signal and the other terminals. In a conveyor S relay device that inputs a demodulated signal of a signal to a relay determination unit to determine a fault section of the power system, a lock signal to the #+ terminal is applied only when one end is inflow during inspection of its own terminal relay. A transport protection relay device characterized by being equipped with an inspection function that sends out signals to the user.