JPS5998426A - Interlock unit for auxiliary bus interrupting switch in opening and closing facility of auxiliary bus type - 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 The present invention provides a disconnector interlock device, more specifically, a system for determining whether or not an auxiliary bus disconnector disposed in an auxiliary bus type switching equipment can be opened/closed in advance of the start of the operation. Regarding an interlock device that can be determined based on

The auxiliary bus system as shown in the skeleton diagram of Figure i1 is widely adopted in substations and the like to reduce the need for electrical equipment such as circuit breakers and disconnectors, and to effectively perform uninterruptible power transmission.

The basic configuration of such an auxiliary bus system is that the auxiliary bus 2 is wired in parallel to the main bus 1, which has a plurality of power supply lines 3 each having a line breaker 4 interposed therebetween. death,
Furthermore, the circuit breaker 4 of each of the above power supply lines 3...
An auxiliary bus disconnector 5 is connected between the load side of the bus 2 and the auxiliary bus 2.

By the way, in the case of the auxiliary bus system as well as with other bus systems, if an accident occurs in the power supply line 3 or when the line breaker 4 is removed for maintenance inspection, the auxiliary bus must be removed. It becomes necessary to open and close the disconnectors 5, but when opening and closing these auxiliary bus disconnectors 5, it is important that they be operated in non-safe conditions.

Therefore, in such a bus system, prior to operating the auxiliary bus disconnect switch 5, it is necessary to systematically judge whether or not the operation is possible, so that the opening/closing operation of the auxiliary bus disconnect switch 5 can be performed safely without mistakes. At present, there is a strong desire to develop an electrical interlock system for auxiliary bus disconnectors that enables this.

This invention was developed in response to such a request, and a plurality of ink-lock devices having a similar configuration are provided corresponding to each auxiliary bus disconnect switch, and the auxiliary bus disconnect switch to be operated By simply operating the test contacts, it is possible to systematically judge whether the auxiliary bus disconnect switch can be opened or closed, and if the judgment result meets the preset operable conditions,
To provide an interlodge device which releases the interlock of a corresponding auxiliary bus disconnect switch for the first time.

It has been developed by embodying the possible conditions, and the operational conditions are as follows.

That is, since a disconnector generally does not have the ability to directly switch on or off the load current, it is necessary that the disconnector to be operated be under conditions such that it does not open or close the current.

Therefore, when such conditions are applied to the auxiliary bus disconnector in the auxiliary bus system, the conditions are limited to the following (a) to (C).

First, the first condition (a) is when both ends of the auxiliary bus disconnector 5 to be operated are connected to the main bus of the same power supply, and the stiffness is a specific problem in the above-mentioned auxiliary bus system. When applied to, for example, if 5 is the auxiliary bus disconnector to be operated, the circuit connected to the disconnector 5 as shown in FIG. 2a,
For example, the line breaker 4 is closed, and the line breaker 41 and the disconnector 5 are closed in at least one other line.
′ are both in the input state. (See Table 1a) Next, the second condition (b) td is that all lines other than the auxiliary bus disconnector that should not be operated (where ■ the auxiliary bus disconnector is open, or The line breaker connected to the auxiliary bus disconnector other than the auxiliary bus disconnector that should be used is open, the auxiliary bus disconnector is closed, and the power supply line (hereinafter referred to as "power supply line") is connected to the auxiliary bus disconnector. The line breaker connected to the auxiliary bus disconnector to be operated is open and the feeder line is not connected. If this is applied specifically to the auxiliary bus system in either of the states, all of the auxiliary bus disconnectors 51... other than the auxiliary bus disconnector to be operated will be opened as shown in Figure 2b-1. Auxiliary bus disconnect switch 5) other than the auxiliary bus disconnect switch that should be operated when the condition is present or as shown in Figure 2b-2.
For all of them, the line breaker 4" connected to the stiffness 2 is open and the auxiliary bus disconnector 5 is closed.
If the feeder lines are connected for all of I. or not, as shown in Figure 2b-3, all of the auxiliary bus disconnectors other than the auxiliary bus disconnector 5 to be swept, or - If the lines shown in Fig. 1 and Fig. 2b-2 are mixed, the lines of the auxiliary bus disconnector 5 that should be swept separately as shown in Fig. 2b-4 may be cut off. (See table b)) The third and final condition (c) is that both terminals of the auxiliary bus disconnect switch to be operated are in a no-voltage open state. More specifically, when the disconnector 50 and line breaker 4 to be operated are in the open state as shown in FIG. This is the case (see Table 1c) where the circuit is configured with either the circuit breaker 4' open and the disconnector 5' closed, or the circuit breaker 51 open (see Table 1c). However, there is a condition that there is no reverse charging in the seat of each power supply line.

Table 1a - Table 1b - By the way, in order to detect the establishment of the above conditions, the device of the present invention connects individual signal lines indicated by AI, BI, and CI, and transmits a signal between the signal lines. The validity of the above conditions is determined by mutual transmission and reception, and each interlock device has the above-mentioned AI, Bl, CI in addition to the positive terminal P+Pl+P2 and the negative terminals N+N1, N2.
AI BI +B2 +C1+
It has a C2+ terminal.

The connection of each interlock device Δ is as shown in FIG. 3, with the A terminals connected in parallel by AI, and BI+C1 of the adjacent interlock device B2. It is connected continuously to C2, and the B2+C2 terminal at the rear end of the interlock device is connected to return to the B1+CI terminal at the starting end via Bl and CI.

Furthermore, among these terminals, Pl+Nl constitutes a multiple selection prevention circuit, and is designed to detect whether or not the corresponding disconnector is operated only for the interlock device whose test contact was operated first. .

A schematic configuration of this multiple selection prevention circuit is shown in FIG. 4, and the basic principle of this circuit is that each interlock device A1 is selected by operating the test contact 6 of each interlock device. A2. The two contacts X15+X16 on each side of the P and N side terminals of A3 are opened at the same time, and of the two contacts, the contact x15 on the P side wire is the terminal side of the interlock device A2 to be operated. ni, and N
Since the contact X16 interposed on the side wire is interposed on the starting end side of the interlock device A2 to be operated, the N side of the interlock device A1 on the starting end side of the interlock device A2 which operated the inspection contact 6 does not conduct. No, because one interlock device A3 on the terminal side does not conduct on the P side, it cannot be operated and prohibits the operation of multiple devices at the same time.

Next, the configuration of the interlodge apparatus A of the present invention will be explained. As shown in FIG. 5, each interlock device A is an auxiliary contact for an auxiliary bus disconnector that is opened or closed in response to the opening/closing operation of a test device that is operated to determine whether or not the corresponding auxiliary bus disconnector can be operated. 8, and signal lines Tsuru AI and BI provided according to preset operable conditions.
, C1 is activated only when an energizing path is formed between them to release the interlock of the auxiliary bus disconnector 5.The configuration of each of the relays 91 to 94 will be explained below. Then, the inspection contact 6 has an inspection activation relay 61 that is activated when this contact 6 is operated, and roughly speaking, this activation relay 61 has the aforementioned two contacts X□5+x16 for prohibiting multiple operations, It has a plurality of contacts X1 to X, which are activated to make a logical judgment when determining the operable condition of the disconnector.

The circuit breaker auxiliary contact 7 is a transfer type contact that is activated according to the open/closed state of the corresponding circuit breaker, and when the corresponding circuit breaker is opened, the right contact 7b is closed and the latch relay CXR is activated. And when the circuit breaker is closed, the left contact 7a is closed and the latch relay CX can be operated.
have common contacts CX1 to CX5, and are designed to perform reversal operations with respect to each other.

The auxiliary bus disconnector auxiliary contact 8 is a transfer type contact that is activated according to the open/closed state of the corresponding auxiliary bus disconnector, and when the corresponding auxiliary bus disconnector is opened, the right contact 8b is closed and latched. When the relay AXR is activated and the disconnector is closed, the left contact 8a is closed to activate the latch relay AX, and the latch relays AX and AXR have common contacts AX□ to Ax3. are designed to perform inverse operations to each other.

In the embodiment, there are 91 to 9404 condition determination relays, each of which corresponds to θh (a) to (c).
The circuit is energized by a closed circuit formed when the following conditions are satisfied, and by closing any of the contacts AF to DF, the electromagnetic coil 10 is excited and the interlock of the auxiliary bus disconnector can be removed.

Although the interlock release means is not shown, any known means capable of disabling the operation of the opening/closing operation lever of the auxiliary bus disconnect switch may be appropriately adopted and used; the configuration of this part is as follows. Since this is not the gist of the device of the present invention, a detailed explanation thereof will be omitted.

Therefore, when the test contact 6 of the interlock device corresponding to the auxiliary bus disconnect switch is operated to detect whether the auxiliary bus disconnect switch can be opened or closed, the following logical judgment is made. The interlock of the auxiliary bus disconnect switch is released.

That is, if the condition (a) is satisfied, at least one other line VC other than the operation line is present. Therefore, latch relay AX and latch relay CX are activated to close their contacts AX and CX. In this interlock device, the test contact 6 is never closed, so Xl remains closed. As a result, P+AX
An electric path defined by 1→X1→CX,→A is formed and A
I,%2 device ((In this case, since the circuit breaker is in the closed state, the circuit breaker auxiliary contact 7 is closed on the 7a side, activating the latch relay CX, which closes the contact CXl, forming an electric path +N. The relay 91 is activated. As a result, the contact AF i" of the judgment relay 91 is closed.
The magnetic coil IO is energized and the interlock is released.

Next, we will consider the case where condition (b) is satisfied. This condition means that all lines other than the line corresponding to the auxiliary bus disconnector to be operated have the auxiliary bus disconnector open, or Auxiliary f when circuit breaker opens! , the line disconnector is turned on, and the feeder line is not connected, or both are in a mixed state. First, consider the case where the auxiliary bus disconnector is open. @
Let us examine the operation of each interlock device A when the circuit breaker is open, the auxiliary bus disconnector is closed, and the power supply line is not connected.

■If the auxiliary four-wire disconnect switch is in the open state, contact 8 of the auxiliary bus disconnect switch of the intercock device on the line side
is closed on the 8b side, and AX remains closed because AXR operates in the latch relay, but at this time, the inspection contact 6 is not operated and remains open 5, so the contact and maintain the closed state.

As a result, an electric path defined by B, ->AX, ->X, , →B2 is formed.

Next, when Vc@, that is, the circuit breaker is opened, the auxiliary bus is disconnected, so its contact cx2 is closed, and since the disconnector is closed, the 8a side of the auxiliary contact 8 is closed. At this time, the inspection contact 6 is not operated in the same way, so now short-circuit ■ and ■. ), then each intercock device;
＞X,. -) AX5-)

Therefore, under these conditions, the bottoms of each interlock device will be connected to each other from B1 to B2, and when the inspection contact 6 of the interlock device Δ on the line side to be operated is operated, its contact X12 will be immediately connected. Close p->x,
2→B2 is formed, and B1→x3→92→N is formed on the bottom of the interlock device on the line side that should be operated via BI.
The relay 92 is activated by forming an electric path.

As a result, contact BF closes, thereby energizing the electromagnetic coil arm and releasing the interlock.

The judgment relay 94 is used especially when the circuit breaker on the operating line side is open and the power supply line is not connected to the auxiliary bus in the case of condition (b). In this case, the test contact Operate 6, then P-+X7. ■U■-,,CX
An electric path 2→X, , 94->N is formed 7, and contact D
The interlock is released immediately after F is closed.

Finally, consider condition (c).

Under these conditions, other circuits can only be in one of two states: (1) the breaker is open, the 0 (0) disconnector is closed, and the circuit breaker is open. Auxiliary contact for disconnector 8i”
Since the tab side is closed, contact xQ +
X3 is closed to form an electric path C1→X6→AX3→X14→c2.

In the case of @, the inspection contact 6 is not operated, the 8a side of the disconnector auxiliary contact 8 is closed, and the 7b side of the breaker auxiliary contact 7 is closed, so the latch relay A
X and CXR are activated, AX2 and CX3IJ'1 are both closed, χ6 + X14 is also closed, and if there is no reverse charge, ■ and 10 are shorted, so C1 →
An electric path of X2→cX3→■→1°→X2→C2 is formed.

On the other hand, regarding the intercock device π on the operation side, when the inspection contact 6 is turned on, X13 is closed and X14 is open, so power is supplied to P->X13->c2, and the circuit breaker is disconnected by opening. The dexterity auxiliary contact 7fa'7b side is closed, so the latch relay CXR is activated, and the contact cx3 is closed, and there is no reverse charging.
is short-circuited (this short-circuiting operation can be easily performed by providing a means for detecting the presence or absence of reverse charging in the interlock device), so when the test contact 6 is turned on, x5 is closed. C1->C, →X, →CX3→
A circuit is formed as follows: ■→10→X8, relay 93 is energized, and its contact CF is closed.

As a result, the electromagnetic coil 10 is excited and the interlock of the disconnector is released.

As can be understood from the above detailed description, according to the device of the present invention, systematic control of interlocks of auxiliary disconnectors in auxiliary bus type switching equipment can be easily realized.

In addition, since it can be easily installed by simply installing an interlodge device that is compatible with the disconnect switch and connecting these devices, it is extremely easy to add auxiliary/bus disconnect switches.

Furthermore, since it is a fail-safe system that becomes inoperable if a failure occurs in the device circuit, highly reliable interlock system control can be realized. It offers many benefits that can significantly contribute to improving the reliability of this type of switchgear.

[Brief explanation of drawings]

Figure 1 is a skeleton diagram of the auxiliary busbar system, Figures 2a to 2c are diagrams schematically showing the operating conditions of the auxiliary bus disconnect switch, and Figure 3 is a diagram of the interlock device of the present invention. FIG. 4 is a wiring diagram showing the installed state, FIG. 4 is a diagram explaining the principle of the multiple operation prohibition circuit, and FIG. 5 is a detailed diagram of one embodiment of the interlock device of the present invention. (Explanation of symbols) A: interlock device of the present invention, l: main bus, 2:
... Auxiliary bus bar, 3... Power supply line, 4... Line breaker,
5... Auxiliary bus disconnector, 6... Contact for inspection, 7... Auxiliary contact for line breaker, 8... Auxiliary contact for auxiliary bus disconnector, 91-94 - Condition judgment relay, Work○... Electromagnetic Coil, AI, BL, CI...signal line. Patent applicant: Kansai Electric Power Co., Ltd. Toko Seiki Co., Ltd. Representative: Patent attorney: Tokutaka Dosu - Procedural amendment is a formula) 4ゎrenal 4. J48 Kazuo Wakasugi, Commissioner of the Japan Patent Office 1, Indication of the case, Patent Application No. 1983-207891 3, Person making the amendment 4, Agent March 29, 1981 (shipment date) 6. Indication of the specification to be amended Brief explanation of drawings column 7, content of amendments as per attached +1) Brief explanation of drawings column Specification, page 19, line 18 to line 20 of the same page "Figures 2a to 2c are ``Both figures schematically show the operating conditions for the auxiliary bus disconnect switch'' is corrected as follows. [Figure 2a is a diagram schematically showing the first operable condition of the auxiliary bus disconnector, and Figure 2b-1 is a diagram schematically showing the first example of the second operable condition of the auxiliary bus disconnector. Figure 2b-2 is a diagram schematically showing a second example under the second operable condition as described above, and Figure 2b-3 is a diagram schematically showing a third example under the second operable condition as above. Figure 2b-4 is a diagram schematically showing an example of the above second operable condition; Figure 2C is a diagram schematically showing the fourth example of the above second operable condition; A diagram schematically showing the conditions.”

Claims (1)

[Claims] The above-mentioned solution can be achieved by connecting each of the auxiliary bus disconnectors in the auxiliary bus type switchgear and transmitting and receiving signals between the connected signal lines. An interlock device for an auxiliary bus disconnect switch, which detects whether or not the auxiliary bus disconnect switch can be operated, and releases the interlock of the auxiliary bus disconnect switch only when the operable condition is established, comprising: (a) ) A test contact that is operated to determine whether or not the corresponding auxiliary bus disconnect switch can be operated; (b) A line interrupter that is operated to open or close in response to the opening or closing operation of a line breaker interposed in the power supply line of the switching equipment. (C) An auxiliary bus disconnector auxiliary contact that opens and closes in response to the opening/closing operations of the auxiliary bus disconnector, and (d) a signal line provided in accordance with the operable conditions set by the 6-way crimping. An auxiliary bus in an auxiliary bus-type switching equipment, characterized in that it is equipped with a condition determination relay that is activated only when an energized path is formed between them to release the interlock of the auxiliary bus disconnector. Disconnector interlock device.