JPH03251034A - Fault zone detector - Google Patents

Abstract

PURPOSE:To shorten time required for detecting a fault zone by detecting fault information by a master station, immediately measuring the intrinsic impedance of a slave station by a signal processor, driving the automatically sequentially feeding means of the slave station when the measurement is finished, and sequentially supplying power to the slave station adjacent to a load. CONSTITUTION:A fault detector n1 detects a fault to drive a fault detection relay Ryn1, thereby closing its a contact Ryn1-1. A closed circuit is formed by the operation between connecting terminals (n-1) and (n-2), and a fault detection current flows to a signal line. When a signal processor 30 detects the current, it drives a fault detection relay Ry1 to switch its (a) contact Ry1a to its (b) contact Ry1b, thereby switching its voltage polarity. A slave station 1n starts energizing an automatically sequentially feeding relay Ryn2 from this time point, waits the end of measuring time of an intrinsic impedance Zn, then switches its output contact Ryn2-1 to OFF and its output contact Ryn2-2 to ON.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a fault section detection device that detects a fault section at high speed in order to take into account the balance of power supply and demand and achieve early restoration when an accident occurs on a power distribution line.

[Conventional technology]

Grounded power distribution systems use segmental switching elements (hereinafter referred to as segmental switches) equipped with fault detection sensors that divide distribution lines into predetermined sections in order to minimize power outage sections and to quickly detect failure points in the event of a distribution line failure. ) and a loop point switching element (hereinafter referred to as a loop point switch) with a failure detection sensor at the interconnection point that performs reverse power interchange transmission. FIG. 5 is a distribution system diagram in which, for example, distribution lines output from three distribution substations are interconnected by loop point switches, and in the figure, As/s, Bs/s and Cs/s
are the distribution substations, 1 is the bus of the distribution substation As/s, 2 is the bus of the distribution substation B s/s, 3 is the bus of the distribution substation Cs/s, CBII and CBk1 are the bus 1 of the distribution substation CB21 is a breaker connected to bus 2 of distribution substation B s/s, CB51 is a breaker connected to bus 3 of distribution substation Cs/s,
Fll is a distribution line that is connected to the other terminal of the distribution line breaker CBII and supplies power to consumers, and Fkl is a distribution line that is connected to the other terminal of the distribution line breaker CBk1 and supplies power. , F21. F31 is each power distribution line, 5S
II to 5S13 and SSk 1 to 5Sk3 are distribution lines Fi
5SIO is a loop point switch for connecting distribution line Fil and distribution line F21, and 5SkO is for connecting distribution line Fkl and distribution line F31. Loop point switch for system, Sll
, S12゜S13 is breaker CBII, section switch 5S
II. It shows the sections of the distribution line Fil divided by 5S12 and the loop point switch 5SIO, and the first section of the distribution line Fil is from the section closer to the circuit breaker CB11. The second section, the third section, and also Ski, Sk2. Sk3 indicates each section of the distribution line Fkl divided by the breaker CBk1, the section switches 5Skl, 5Sk2, and the loop point switch 5SkO, and is the first section of the distribution line Fkl from the section closer to the breaker CBk1. This will be the second section and the third section. Also, 11, 12° 13 and kl, 2. 3 is section switch 5SII~5S13,
This is a slave station for 5Skl to 5Sk3. Further, 10-1 to 13-1 and ko to 1 to 3-1 are section switches 5SII to 5S13 and loop point switches 5S, respectively.
The sectional switches are controlled from the slave station using the control lines of the IO and the sectional switches SSk 1 to 5Sk3 and the loop point switch 5SkO, and the failure state of each section is detected. 40
is a master station, and C1 and C2 are communication lines for transmitting information between the master station 40 and slave stations 10 to 13 and kO~. Next, the operation will be explained. First, section switch 5SII
~5S13, 5Skl ~5Sk3 and loop point switch 5
SIO and 5SkO are slave stations 10 each equipped with a failure detection function.
~13. It has 3 in ko-. The master station 40 periodically collects information via the communication lines CI and C2 by a polling method in order to collect failure detection information from each of the slave stations 10 to 13 DEG kO. At that time, for example, if a one-line ground fault occurs in the third section 313 of the distribution line Fil, a ground fault current as shown by an arrow flows through the distribution line 11. The distribution line 11 is operated before the circuit breaker CBII of the distribution substation A s/s operates (the circuit breaker is connected to the It is necessary to turn on the loop point switch SIO (activated approximately 0.5 to 1.0 seconds after the fault occurs) to form a loop, and then disconnect the section switch 5S12, 3313 at high speed. In this case, the master station 40 is the loop point switch 5SIO1 or 5
Before introducing SkO, the slave station 5SI is sequentially polled.
Determine the fault section based on the fault detection information collected from I, 5S12, determine which loop point switch to turn on will have the least impact on the system, and select the best loop point switch to disconnect. Select a vessel. Determining this fault section is difficult due to the fact that polling time to collect fault detection information from all slave stations takes a lot of time, and in the event of a two-wire ground fault, the slave station power supply decreases due to a drop in line voltage of the distribution line. There was a gap in the failure detection information of the station, and the correction process was taking a lot of time to determine the failure area. Furthermore, in the worst case, it may become impossible to determine a faulty section. In this way, in the past, the time between the fault section detection time and the selection operation of the loop point switch was 0 as described above.
, because it took more than 5 to 1.0 seconds, the distribution line circuit breaker at the distribution substation tripped, and the fault section was detected and the fault was detected by reclosing the circuit, re-reclosing the circuit, and opening/closing the switch by manual/program. Sections were separated and power was transferred to healthy sections.

[Problem to be solved by the invention]

Since the conventional fault section detection device is configured as described above, it is possible to detect a fault section by collecting fault detection information of all slave stations when a ground fault occurs (between the distribution line and the slave station due to wiring work, etc.). (Because there are many connection changes to communication lines, the polling order changes and it is necessary to collect all information), correction processing for missing slave station information due to grid voltage drop in the event of an accident, and loop point switch selection operation. Since the required time exceeded the time required for the circuit breaker on the distribution line to operate, that is, 0.5 to 1.0 seconds, a power outage occurred in healthy sections other than the faulty section.
Moreover, as the period became longer, the recovery of the failed section was delayed. As a result, there has been a problem that, for example, various electronic products such as OA equipment, which are a load on the power distribution line, are greatly affected. This invention was made to solve the above-mentioned problems, and it is possible to detect faulty lines at high speed and collect fault information of slave stations related to the faulty line at high speed, regardless of the presence or absence of grid voltage. It is an object of the present invention to provide a fault section detection device that reduces the time required to detect a fault section.

[Means to solve the problem]

The fault section detection device according to the present invention operates a fault detection unit of a slave station that drives a latch-type fault detection relay on the slave station side when a failure in a distribution line is detected, and a failure detection relay on the slave station side. automatic progressive means for connecting the characteristic impedance to the signal line and, when the signal processing section of the master station measures the characteristic impedance, disconnecting the characteristic impedance after a predetermined time and supplying power to another slave station on the load side; A failure detection sensor of the master station detects failure information of slave stations due to distribution line failure via a signal line, and when the failure information from the failure detection sensor is confirmed, the power supply polarity of the signal line is switched and the automatic sequential transmission is performed. The signal processing unit of the master station drives the failure detection relay on the master station side, which activates the means, and the signal processing unit of the master station drives the failure detection relay on the master station side.It can collect slave station information and detect failure areas at high speed even when the grid voltage drops due to a failure etc. or during a power outage. This is to ensure that this is done correctly.

[Effect]

When a fault occurs in the distribution line, the master station in this invention detects the fault information, immediately measures the inherent impedance of the slave station in its signal processing section, and when the measurement is completed, drives the automatic forwarding means of the slave station. Since power is sequentially supplied to the adjacent slave stations on the load side, failure sections can be detected in a short time through measurement of inherent impedance, and information on the slave stations can be reliably collected even during a power outage by supplying power from the master station.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. In the figure, parts that are the same as those in Figure 5 are designated by the same reference numerals.
In the figure, the diagram is a configuration diagram of a slave station showing only the parts related to the present invention, where 5S1n is a section switch of the slave station 1n, nl is a failure detection unit that detects a failure in the distribution line, and R
yn+ is a latch-type failure detection relay that operates according to a command from the failure detection section n1 only when a distribution line failure occurs on the load side, and n-1, n-2, n-3, and n-4 are communication lines. The connection terminal of Ryfi! 27 is a characteristic impedance having an impedance value determined for each slave station, Do is a bypass diode, and D, 2 are backflow prevention diodes. Further, in FIG. 3, numeral 40 is a master station showing only the parts related to this invention,
Es is a direct current power source as an independent power source, and 30 is a signal processing unit having a voltage detection sensor 31 as a failure detection sensor and a current detection sensor 32 such as a DCCT. RyI is a failure detection relay, and Ry+m+R)'+b are a and b contacts of the failure detection relay Ry1, respectively. Next, the failure detection operation of the slave station will be explained with reference to FIG. First, in a steady state, a voltage with a polarity such that n-2 becomes positive is applied to the connection terminals n-1 and n-2 of the slave station 1n via the b contact R)+b of the failure detection relay Ry, and is applied to the DC power supply. It is applied from Es. In a state where no distribution line fault has occurred in the distribution line Fil, the impedance between the connection terminals n-1 and n-2 is approximately infinite. Here, the distribution line Fi
When a short circuit or ground fault occurs in I, the fault detection section n1 detects the fault and drives the latch-type fault detection relay Ryゎ, and closes the a contact RyゎI-1. Connection terminal n-
Due to this operation, the characteristic impedance Z between 1 and n-2
, l, relay contact Ry, , -+. A closed circuit is formed through Ry and □-1, and a failure detection current commensurate with the specific impedance Z7 flows through the signal line. When the signal processing unit 30 detects the failure detection current of the signal line by the current detection sensor 32, it immediately activates the failure detection relay R.
Drive y1 and connect its a contact R)'+m to b contact R)'+
b, and the voltage polarity is changed so that a positive voltage is applied to the connection terminals n to 1 of the slave station 1n. From this point on, the slave station 1n switches backflow prevention diodes D, 1! Then, the on-delay type automatic sequential relay Ry, □ starts to be energized, waits for the end of the predetermined delay time, that is, the measurement time of the characteristic impedance Z7, and then turns off its output contact R'1nz-1.
Switch tt-z to ON. For example, in the case of FIG. 3, the fault detection current of the signal line flowing through the characteristic impedance Z1 is taken into the signal processing section 30 via the current detection sensor 32,
The value of the characteristic impedance Z1 is measured during a measurement time T. A time chart of the slave station information transmission is shown in FIG. Next, when the bypass diode Dfi+ is short-circuited by the ON operation of the a contact Ry 2-2 and voltage is applied to the communication line of the next slave station on the load side, the same operation as above occurs sequentially to the last slave station. Repeated until the station. The signal processing section 30 then measures each characteristic impedance. When the master station 40 resolves the failure section by measuring the characteristic impedance of all the slave stations, the master station moves on to the control operation of the sectional switch and the loop point switch. Therefore,
The time required for polling is significantly reduced compared to the conventional fault detection method using all slave stations. Furthermore, since the power source of the slave station is not used to measure the inherent impedance of the slave station, measurement can be performed reliably even if the system voltage drops due to an accident or the like. Other than that, the subsequent control operations of the section switch in the event of a ground fault or short circuit accident will proceed in the same manner as in the conventional example. In addition, in the above embodiment, an embodiment in which both the master station and the slave station are mainly composed of auxiliary relays has been shown, but an automatic sequential circuit using a semiconductor element may also be used, and the same effect as in the above embodiment can be obtained. . Further, although an example in which a DC power source is used as the signal power source of the master station has been described, when an AC power source is used, and although the voltage source has been described, it may be used as a current source, and the same effects as in the above embodiments can be obtained. Furthermore, the same effect as in the above embodiment can be obtained in the case where the failure detection state of the slave station is detected by the voltage on the communication line, one phase of the current, the frequency change, etc. by the automatic sequential means.

【Effect of the invention】

As described above, according to the present invention, the master station includes a signal processing unit that receives fault information of the distribution line from the fault detection sensor and the power supply that supplies the signal line, and the slave station has the signal processing unit that receives the fault information of the distribution line from the fault detection sensor, and the slave station When this occurs, fault information is output to the master station by connecting the inherent impedance, and an on-delay type automatic progressive means is provided to supply power to the slave stations on the load side after a predetermined period of time to detect the fault section. This eliminates the need for complicated protocols or transmission formats between the master station and slave stations, allows high-speed detection of faulty sections, and allows power to be supplied from the master station and maintained by the slave stations even during power outages. This has the effect of being able to collect failure detection information.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a fault section detection system to which the present invention is applied, FIG. 2 is a block diagram of a slave station showing an embodiment of the present invention, and FIG. 3 is a block diagram of a slave station information collection circuit according to the present invention. , FIG. 4 is a slave station information transmission time chart, and FIG. 5 is a configuration diagram of a conventional fault section detection device. In the figure, As/s is a distribution substation, Fil is a distribution line, 5SII to 5S1n are switches, 11 to 1n are slave stations,
C is a communication line, 40 is a master station, Ry, l is a failure detection relay, nl is a failure detection section, 30 is a signal processing section, R)'nz is an automatic sequential relay (automatic sequential means), 31.32 is a It is a failure detection sensor. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Evening 1 Figure Figure Haruma Heisei sho (self-produced) 2.6.29 Month Date Year 2 Name of the invention Failure section detection device 3 Relationship with the case of the person making the amendment Patent applicant address Marunouchi, Chiyoda-ku, Tokyo 2-2-3 Name (601) Mitsubishi Electric Corporation Representative Moriya Shiki 6 Contents of amendment (1) The scope of claims in the specification will be amended as shown in the attached sheet. (2) Correct rkO~l~ to 3-'' on page 4, line 9 of the specification to rkO-1- to 3-J. (3) "Third section 513J" on page 5, line 5 of the specification is corrected to "third section S13." (4) [Failure section detection time] on page 6, line 7 of the specification
is corrected as "from fault section detection". (5) "Due to wiring work, etc." on page 6, line 18 of the specification is corrected to "j due to distribution line work, etc." (6) "Control of section switch, etc." on page 12, line 8 of the specification "operation" is corrected to "control operation of sectional switch". 7. At least one document stating the amended scope of patent claims in the list of attached documents The amended scope of claims is for a switch installed in each section of multiple distribution lines connected to a distribution substation. A slave station for fault detection installed at the installation point,
a master station that receives fault detection information on the distribution line detected by the slave station via a communication line and controls the switch; and a latch-type failure detection relay on the slave station side when a failure on the distribution line is detected. When the characteristic impedance is connected to the signal line by the operation of the failure detection unit of the slave station that drives the slave station and the failure detection relay of the slave station, and the signal processing unit described below measures the characteristic impedance, the characteristic impedance is determined after a predetermined time. an automatic progressive means for disconnecting the power supply and supplying power for the signal line to another slave station on the load side; and a failure detection sensor for detecting failure information of the slave station due to a failure in the distribution line via the signal line. , a signal processing unit that drives a failure detection relay on a master station side that switches the power supply polarity of the signal line when confirming failure information of the failure detection sensor and operates the automatic sequential means. .

Claims (1)

[Claims] A slave station for failure detection installed at the installation point of a switch installed in each section of multiple distribution lines connected to a distribution substation;
a master station that receives fault detection information on the distribution line detected by the slave station via a communication line and controls the switch; and a latch-type failure detection relay on the slave station side when a failure on the distribution line is detected. When the characteristic impedance is connected to the signal line by the operation of the failure detection unit of the slave station that drives the slave station and the failure detection relay of the slave station, and the signal processing unit described below measures the characteristic impedance, the characteristic impedance is determined after a predetermined time. an automatic progressive means for disconnecting the power supply and supplying power for the signal line to another slave station on the load side; and a failure detection sensor for detecting failure information of the slave station due to a failure in the distribution line via the signal line. , a signal processing unit that switches the power supply polarity of the signal line upon confirming failure information of the failure detection sensor and drives a failure detection relay on the master station side that operates the automatic progressive means.