JPH03164019A - Spot network receiving device - Google Patents

Abstract

PURPOSE:To enable detaching only the accident section in the case of an accident of a bus bar by installing bus bar breakers, accident direction detectors, accident section determiners, and switching means between the adjacent receiving lines of the network bus bar. CONSTITUTION:A receiving device supplies electric power, supplied through receiving lines 3a-3c, to loads through a network bus bar 4 equipped with bus bar breakers 2a and 2c and accident direction sensors 13a, 13ba, 13bc, and 13c. The accident direction sensors 13a-13c detect a short-circuit current from a receiving bank to a receiving bank adjacent thereto and transmit the result of the detection to an accident determiner 11. The accident determiner 11 having accident detection circuits 12a, 12b, and 12c determines the accident section of the network bus bar 4 based on signals from the receiving banks 1a, 1b, and 1c and from the accident direction sensors 13a-13c and detaches only the accident section.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a spot network power receiving device that receives power from two or more lines.

(Prior Art) A spot network power receiving device is conventionally known as a power receiving device that performs multi-line power reception of two or more lines.

This spot network power receiving device receives power from two or more power receiving lines and supplies it to each load via the network bus, so that even if there is a power outage on any power receiving line, it will continue to be delivered to each load. and supply power.

(Problems to be Solved by the Invention) However, in the above-mentioned conventional spot network power receiving device, accidents such as short circuits occur in the network bus bar because the network bus bar is not provided with a bus bar contact breaker or a directional short circuit relay. However, there was a problem in that it was not possible to identify the accident section or protect the section, resulting in a total power outage.

In view of the above circumstances, the present invention has been developed to provide a spot where, when an accident such as a short circuit occurs in the network busbar, the fault section can be determined and only the fault section can be cut off to continuously supply power to other parts. The purpose is to provide a network power receiving device.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, a spot network power receiving device according to the present invention provides a spot network power receiving device that supplies power supplied via a plurality of power receiving lines to each load via a network busbar. In the network power receiving device, a bus circuit breaker provided between each power receiving line of the network bus section;
an overcurrent detection unit that detects whether each of the power receiving lines is in excess T4 current; and a fault direction detection unit that detects the fault direction when a fault occurs in a portion of the network bus that corresponds to each power receiving line. and an accident area determination unit that determines an accident area based on the detection result of the accident direction detection unit, the detection result of the overcurrent detection unit, and the important state of the bus circuit breaker, and the determination result of this accident area determination unit. The system is characterized in that it includes a switching section that disconnects only the accident section and continuously supplies power to other sections based on the following.

(Function) In the above structure, if an accident occurs in the network bus section, the fault section determination section determines the fault direction based on the detection result of the fault direction detection section, the detection result of the overcurrent detection section, and the important state of the bus circuit breaker. The accident section is determined, and the switching section disconnects only the accident section and continuously supplies power to the other sections.

(Embodiment) FIG. 1 is a configuration diagram showing an embodiment of a spot network power receiving device according to the present invention.

The spot network power receiving device shown in this figure includes a first power receiving bank section 1a, a second power receiving bank section 1b, a third power receiving bank section 1c, two bus circuit breakers 2a, 2 (and four short circuit direction detecting sections). 13a, 13ba, 13bc, and 13c, and takes in the power supplied via the first to third power receiving lines 3a to 3c, and supplies this to each load via the network bus section 4. When an accident occurs somewhere in the network bus section 4, the accident section is determined, only the accident section is disconnected, and power is continuously supplied to parts other than the accident section.

The first power receiving bank unit 1a has a protector circuit breaker 5 that cuts off the first power receiving line 3a when a trisob command is manually issued.
a, and a current transformer 6 attached to the first power receiving line 3a.
a, and an overcurrent 1i that detects when the first power receiving line 3a is in an overcurrent state based on the output of the current transformer 6a.
When the power-on command is input manually and the network bus section 4 is in a no-voltage state, the protector circuit breaker 5a is turned on and the power supplied via the first power receiving line 3a is switched on. It is supplied to the network bus section 4. Further, when a trip command for the first power receiving bank is output from the accident determination unit 11 shown in FIG. 2 or when the first power receiving line 3a is out of power, the protector circuit breaker 5a is tripped and and the network bus section 4 are separated.

Further, the second power receiving bank section 1b is connected to the first power receiving bank section 1.
It is equipped with a protector circuit breaker 5b, a current transformer 6b, and an overcurrent relay 7b as in case a, and when a closing command is input and the network bus section 4 is in a no-voltage state, the protector circuit breaker 5b is activated. The power input and supplied via the second power receiving line 3b is supplied to the network bus section 4.

Further, when a trip command for the second power receiving bank is output from the accident determination section 1l, when the second power receiving line 3b is out of power, the blocker circuit breaker 5b is tripped, and the second power receiving line 3b and the network bus section 4 are tripped. Let go of it.

Further, the third power receiving bank section 1c also has the first power receiving bank section 1.
It is configured similarly to the power receiving bank section a and the second power receiving bank section 1b.

Further, the bus circuit breaker 2a is provided between the first power receiving bank side and the second power receiving bank side of the network bus section 4, and when a closing command is input, the bus circuit breaker 2a is connected to the first power receiving bank side of the network bus section 4. Connect the bank side and the second power receiving bank side. Further, when a trip command between the first power receiving bank and the second power receiving bank is outputted from the accident determining section 11, the first power receiving bank side and the second power receiving bank side of the network bus section 4 are disconnected.

Further, the bus circuit breaker 2c is provided between the second power receiving bank side and the third power receiving bank side of the network bus section 4, and when a power-on command is input manually, the bus circuit breaker 2c is connected to the second power receiving bank side of the network bus section 4. Connect to the bank side and the third power receiving bank side. Further, from the accident determination unit 11, the third power receiving bank
When a trip command between power receiving banks is output, the second power receiving bank (11+1) and the third power receiving bank side of the network bus bar 4 are disconnected.

Further, the short circuit direction detection unit 13a connects a current transformer 8a provided between the first power receiving bank side of the network bus section 4 and the bus circuit breaker 2a, and a current transformer 8a provided between the first power receiving bank side of the network bus section 4 and the When a short circuit current flows from the second power receiving bank side to the first power receiving bank side based on the transformer 9a provided between the bus circuit breaker 2a, the output of this transformer 9a, and the output of the current transformer 8a. and a directional short-circuit relay 10a that detects this, detects when a short-circuit current flows from the second power receiving bank side to the first power receiving bank side, and supplies this detection result to the accident determination section 11. do.

Further, the short-circuit direction detection unit 13ba includes a current transformer 8ba provided between the second power receiving bank side of the network busbar unit 4 and the busbar circuit breaker 2a, and a current transformer 8ba provided between the network busbar unit 4 and the busbar circuit breaker 2a.
a transformer 9ba provided between the second power receiving bank side and the bus circuit breaker 2a; It is equipped with a direction short circuit relay 10ba that detects when a short circuit current flows from the first power receiving bank side to the second power receiving bank side, and detects this when a short circuit current flows from the first power receiving bank side to the second power receiving bank side. The accident determination section 11
supply to.

Further, the short circuit direction detection section 13bc includes a current transformer 8bc provided between the second power receiving bank side of the network bus section 4 and the bus circuit breaker 2c, and a current transformer 8bc provided between the network bus section 4 and the bus circuit breaker 2c.
a transformer 9bc provided between the second power receiving bank side and the bus circuit breaker 2c; The directional short circuit relay 10bc detects when a short circuit current flows from the third power receiving bank side to the second power receiving bank side, and detects this when a short circuit current flows from the third power receiving bank side to the second power receiving bank side. The accident determination section 11
supply to.

Further, the short circuit direction detection unit 13c connects a current transformer 8c provided between the third power receiving bank side of the network bus section 4 and the bus circuit breaker 2c, and a current transformer 8c provided between the third power receiving bank side of the network bus section 4 and the A short circuit current flowed from the second power receiving bank side to the third power receiving bank side based on the transformer 9c provided between the bus bar breaker 2c, the output of this transformer 9c, and the output of the current transformer 8c. When a short circuit current flows from the second power receiving bank side to the third power receiving bank side, the short circuit relay 10c detects this and sends this detection result to the accident determination section l1. supply

The accident determination section 11 includes a first accident detection circuit 1 as shown in FIG.
2a, a second fault detection circuit 12b, and a third fault detection circuit 12c.
When a short-circuit accident occurs in any of the network busbar sections 4 based on the signals from and the individual deadline control signals,
The system determines the accident area, disconnects only the accident area, and continuously supplies power to areas other than the accident area.

As shown in FIG. 3, the first fault detection circuit 12a detects whether the overcurrent relay 7a of the first power receiving bank section La is detecting an overcurrent or the protection circuit breaker 5a of the first power receiving bank section 1a is in the cut-off state. The OR circuit 15 generates a "1" signal when the signal is shorted, and the OR circuit 15 generates a "1" signal when the directional short circuit relay 10a detects a short circuit or the bus circuit breaker 2a is in the disconnected state.
An OR circuit 16 that generates a signal, and an AND circuit 17 that generates a "1" signal when the OR circuit 16 outputs a "1" signal and the OR circuit 15 outputs a "1" signal. We are prepared.

Furthermore, this first fault detection circuit 12a is a directional short circuit relay 1.
A knot circuit 20 outputs a "1" signal when 0ba does not detect a short circuit, and a "1" signal is output from this knot circuit 20 and "1" when the bus circuit breaker 2a is in the closed state. an AND circuit l8 that generates a signal;
This AND circuit 18 outputs a "1" signal and also generates a "1" signal when the overcurrent relay 7a of the first power receiving bank section 1a detects conduction.
and an OR circuit 21 which outputs a ``1'' signal when a ``1'' signal is output from either the AND circuit 19 or the AND circuit 17, and an OR circuit 21 that outputs a ``1'' signal when the OR circuit 21 outputs a ``1'' signal. and a determination circuit 22 that generates a trip signal.

When the overcurrent relay 7a of the first power receiving bank K1a detects an overcurrent while the bus circuit breaker 2a is cut off, or when the protection circuit breaker 5a of the first power receiving bank section 1a is cut off. When the short-circuit relay 10a of the short-circuit direction detection unit 13a detects a short circuit in this state, that is, when one of the first power receiving bank sides of the network bus bar 4, for example, point F1, is short-circuited, each OR circuit 15, 1
6 outputs a “1” signal, and the AND circuit 17 outputs a “1” signal indicating short circuit detection, which is output to the OR circuit 21.
The signal is supplied to the determination circuit 22 via.

As a result, the determination circuit 22 determines that the point F1 is short-circuited, trips the bus circuit breaker 2a, disconnects the fault point F1 portion of the network bus section 4, and also closes the protection circuit breaker 5a of the first power receiving bank section 1a. Trip is caused to stop the power supply from the first power receiving line 3a.

Furthermore, while the protector circuit breaker 5b of the second power receiving bank section 1b and the protector circuit breaker 5c of the third power receiving bank section IC are not yet closed, the busbar circuit breaker 2a is closed, and in response, the first When the protection circuit breaker 5a of the power receiving bank section 1a is automatically closed, the directional short circuit relay 10b
a has not detected a short circuit, and in response to this, a "1" signal is output from the NOT circuit 2o, and a "1" signal is output from the AND circuit 18, and the first power receiving bank section 1a When the overcurrent relay 7a detects an overcurrent, the AND circuit 19 outputs a "1" signal indicating detection of a short circuit, which is supplied to the determination circuit 22 via the OR circuit 21.

As a result, similarly to the operation described above, the determination circuit 22 determines that the point F1 is short-circuited, trips the bus circuit breaker 2a, disconnects the fault point F1 portion of the network bus section 4, and also disconnects the fault point F1 from the first power receiving bank. The protection circuit breaker 5a of the section 1a is tripped to stop the power supply from the first power receiving line 3a.

Further, the second accident detection circuit 12b is connected to the first accident detection circuit 12b as shown in FIG.
An OR circuit 25 that generates a “1” signal when the protection circuit breaker 5a of the power receiving bank section 1a is disconnected or the bus circuit breaker 2a is disconnected;
OR circuit 2 which generates the "l° signal" when the "1" signal is output or the directional short circuit relay 10ba detects a short circuit.
6, and an OR circuit 27 that generates a "1" signal when the overcurrent relay 7b of the second power receiving bank section 1b generates an overcurrent or the protection circuit breaker 5b of the second power receiving bank section 1b is cut off. , an AND circuit 28 which generates a "1" signal when the OR circuit 27 outputs a "1" signal and when the OR circuit 26 outputs a "1" signal.

Furthermore, this second fault detection circuit 12b includes two OR circuits that generate a "1" signal when the bus circuit breaker 2c is cut off or the protection circuit breaker 5c of the third power receiving bank IC is cut off. A "1" signal is output from the OR circuit 29, or the direction short relay 1 0 . When b and c detect a short circuit, an OR circuit 30 generates a "1" signal, and this OR circuit 30 outputs a "1" signal, and the AND circuit 28 outputs a "1" signal. The AND circuit 31 generates a "1" signal when the AND circuit 31 outputs a "1" signal, and the determination circuit 32 generates a trip signal when the AND circuit 31 outputs a "1" signal.

Then, the protection circuit breaker 5 of the first power receiving bank section 1a
Either one of the a s bus circuit breakers 2a is disconnected,
The direction short circuit relay 10ba detects a short circuit, and the OR circuit 26 outputs a "1" signal, and the third
Either the protection circuit breaker 5c or the busbar circuit breaker 2c of the power receiving bank unit 1c is disconnected, or the directional short circuit relay 10bc is exposed to a short circuit, and the OR circuit 30 outputs a "1" signal, and When the protection circuit breaker 5Ml of the second power receiving bank section 1b (is cut off or when the overcurrent relay 7b suddenly generates an overcurrent and the OR circuit 27 outputs a "1" signal, that is, when the protection circuit breaker 5Ml of the network bus section 4 When any part corresponding to the power receiving bank side, for example point F2, is short-circuited, “1” is output from the AND circuit 28.
At the same time as the signal is output, the AND circuit 31 outputs a "1" signal, which is supplied to the determination circuit 32.

As a result, the determination circuit 32 determines that the point F2 is short-circuited, and each bus circuit breaker 2a of the network bus section 4,
2c to disconnect the accident point F2 from the network busbar section 4, and the second power receiving bank section 1b
The protection circuit breaker 5b is tripped to stop the power supply from the second power receiving line 3b.

Further, as shown in FIG. 5, the third accident detection circuit 12c includes OR circuits 35, 36, like the first accident detection circuit 12a.
41, a knot circuit 40, and AND circuits 37 to 39,
The overcurrent relay 7 of the third power receiving bank section 1c is
c detects an overcurrent, or when the direction short circuit relay 10c of the short circuit direction detection section 13c detects a short circuit while the protection circuit breaker 5C of the third power receiving bank section 1c is cut off, that is, when the network bus section 4 When one of the third power receiving banks, for example point F3, is short-circuited, the OR circuits 35 and 36 output a "1" signal, and the AND circuit 37 outputs a "1' signal indicating short-circuit detection. , this is supplied to the determination circuit 42 via the OR circuit 41.

As a result, the determination circuit 42 determines that point F3 is short-circuited, trips the bus circuit breaker 2c, disconnects the fault point F3 portion of the network bus section 4, and also closes the protection circuit breaker 5c of the third power receiving bank section 1c. Trip is caused to stop the power supply from the third power receiving line 3c.

In addition, the busbar circuit breaker 2c is turned on while the protector circuit breaker 5b of the second power receiving bank section 1b and the protector M circuit breaker 5a of the first power receiving bank section 1a are not yet turned on, and correspondingly, the bus circuit breaker 2c is turned on. 3 When the protector circuit breaker 5C of the power receiving bank IC is automatically closed, the direction short relay Lo
e has not detected a short circuit, and in response, the NOT circuit 40 outputs a “1” signal, and the AND circuit 38 outputs a “1” signal.
1" signal is being output, the third power receiving bank section 1c
When the overcurrent relay 70 detects an overcurrent, the three AND circuits output a "1" signal indicating short circuit detection, which is supplied to the determination circuit 42 via the OR circuit 41.

As a result, the determination circuit 42 determines that the point F3 is short-circuited, and trips the bus circuit breaker 2c to disconnect the fault point F3 portion of the network bus section 4, as well as the third power receiving bank. The protection circuit breaker 5c of the section 1c is tripped to stop the power supply from the first power receiving line 3c.

As described above, in this embodiment, the network bus is controlled based on each signal from the first power receiving bank section 1a to the third power receiving bank section 1c, each signal from each short circuit direction detecting section 13a to 13c, and each control signal. When an accident occurs somewhere in 4, the accident section is determined and only the accident section is disconnected, and power is continuously supplied to parts other than the accident section, so when an accident such as a short circuit occurs, only the accident section is disconnected. can be disconnected and power can be continuously supplied to other parts.

〔Effect of the invention〕

As explained above, according to the present invention, when an accident such as a short circuit occurs in the network busbar section, the fault section is determined, only the fault section is cut off, and power is continuously supplied to the open pond section. can do.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a spot network power receiving device according to the present invention, FIG. 2 is a block diagram showing an example of an accident determination section of the same embodiment, and FIG. FIG. 4 is a circuit diagram showing an example of the second accident detection circuit shown in FIG. 2; FIG. 5 is a circuit diagram showing an example of the third accident detection circuit shown in FIG. 2. It is a diagram. 2a, 2c... Bus breakers 3a to 3c... Power receiving line 4... Network bus sections 7a to 7c... Overcurrent detection section (overcurrent relay) 128
~1. 2 c... Accident section determination section, switching section (accident detection circuit) 13a to 13c... Accident direction detection section (short circuit direction detection section)

Claims (1)

[Claims] (1) In a spot network power receiving device that supplies power supplied via a plurality of power receiving lines to each load via a network bus section, the bus circuit breaker provided between each power receiving line of the network bus section; an overcurrent detection unit that detects whether each power receiving line is overcurrent; a fault direction detection unit that detects a fault direction when a fault occurs in a portion of the network bus corresponding to each power receiving line; An accident section determination section that determines an accident section based on the detection result of the accident direction detection section, the detection result of the overcurrent detection section, and the on/off state of the bus circuit breaker; 1. A spot network power receiving device comprising: a switching unit that disconnects only the accident section and continuously supplies power to the other sections based on the following.