CN103837826A - System and method for identification of faulty region of high-voltage switch operating circuit - Google Patents

Abstract

The invention discloses a high-voltage switch operation circuit fault area identification system and method, which includes a switch operation circuit, a signal circuit, a monitoring terminal and a remote monitoring master station. By adding a fault occurrence diagnosis circuit and a fault area diagnosis circuit to the switch operation circuit, Use the diagnostic switch to operate the loop to see if there is a fault and the fault area, generate and display the fault area signal through the signal circuit, and upload the fault area identification result signal to the remote monitoring master station through the monitoring terminal; the fault diagnosis circuit is controlled by the auxiliary contact of the relay The point is connected with the fault area diagnosis circuit, and the fault area diagnosis circuit is connected with the signal circuit through the auxiliary contacts of the control relay, the closing monitoring relay, and the opening monitoring relay to form the fault area identification action logic of the switch operation circuit. The system can realize the identification of the fault area, improve the repair efficiency of the fault line, save the labor force for repair, and greatly reduce the line load loss.

Description

System and method for identifying fault area of high voltage switch operating circuit

technical field

The invention relates to a system and method for identifying a fault area of a high-voltage switch operating circuit.

Background technique

The operation circuit of relay protection is an important circuit to ensure the safe and stable operation of the power grid. During the failure of the operation circuit of the relay protection high-voltage switch, if a power grid accident occurs, the circuit breaker failure protection will be activated, and the entire busbar where the switch is located will be cut off, resulting in a huge load. The only thing that can make up for the loss is to improve the efficiency of emergency repair. However, at present, there is a lack of effective technical means in China, and it is impossible to accurately and quickly distinguish the specific location of the fault in the high-voltage switch operation circuit. Therefore, the emergency repair process involves two groups of professionals (switch operation circuit protection Regional fault repair professionals and switch regional fault repair professionals) cooperate to find the fault area, resulting in long processing time, low efficiency, and a large labor cost.

Contents of the invention

The present invention provides a high-voltage switch operating circuit fault area identification system and method, which overcomes the shortcomings of the prior art described in the background art.

One of the adopted technical schemes that the present invention solves its technical problem is:

High-voltage switch operation circuit fault area identification system, which includes:

The switch operation circuit includes a closing circuit, an opening circuit, a fault diagnosis circuit and a fault area diagnosis circuit. Both the closing circuit and the opening circuit include a switch mechanism, and the fault diagnosis circuit includes several pairs of The control relay of the normally open auxiliary contact, the fault area diagnosis circuit includes a closing monitoring relay and an opening monitoring relay respectively having several pairs of normally open auxiliary contacts and normally closed auxiliary contacts;

A signal circuit for generating and displaying the signal of the fault area of the switch operation circuit, the signal circuit includes the fault signal circuit of the switch area and the fault signal circuit of the protection area;

The monitoring terminal and the remote monitoring master station, the signal loop signal is connected to the monitoring terminal, and the monitoring terminal network signal is connected to the remote monitoring master station;

The fault occurrence diagnosis circuit can contact the fault area diagnosis circuit through the auxiliary contact of the control relay and decide whether to allow the fault area diagnosis circuit to perform fault area diagnosis. The fault area diagnosis circuit passes the closing monitoring relay and opening monitoring relay The auxiliary contact of the auxiliary contact is connected with the signal loop, and the signal loop identifies the fault area by whether the switch area fault signal circuit and the protection area fault signal circuit are connected, and transmits the identification result to the remote monitoring master station through the monitoring terminal.

In one embodiment: the closing circuit includes a tripping monitoring relay, the opening circuit includes a closing monitoring relay, the closing monitoring relay and the tripping monitoring relay have at least one pair of normally closed auxiliary contacts respectively, and the fault The diagnostic circuit includes the normally closed auxiliary contacts of the position monitoring relay, the normally closed auxiliary contacts of the position monitoring relay and the control relay connected in series;

The fault area diagnosis circuit includes area diagnosis circuit 1 connected to the closing circuit and area diagnosis circuit 2 connected to the opening circuit. The area diagnosis circuit 1 includes closing monitoring relays connected in series at both ends of the switching mechanism, The first pair of normally open auxiliary contacts of the control relay; the second regional diagnosis circuit includes an opening monitoring relay connected in series at both ends of the switch mechanism, and the second pair of normally open auxiliary contacts of the control relay.

In an embodiment: the switch operation circuit further includes a first power supply, and the fault diagnosis circuit is connected to both ends of the first power supply.

In an embodiment: the switch operation circuit further includes a second power supply, and the fault diagnosis circuit is selectively connected to two ends of the first power supply or two ends of the second power supply.

In one embodiment: the switch area fault signal circuit includes a first pair of normally open auxiliary contacts of the closing monitoring relay and a first pair of normally open auxiliary contacts of the opening monitoring relay connected in series; the protection area fault signal circuit Comprising the second pair of normally open auxiliary contacts of the closing monitoring relay connected in series, the first pair of normally closed auxiliary contacts of the opening monitoring relay and the first pair of normally closed auxiliary contacts of the closing monitoring relay connected in series, the opening The second pair of normally open auxiliary contacts of the gate monitoring relay, and the third pair of normally open auxiliary contacts of the control relay are respectively connected in series with the fault signal circuit in the switch area and the fault signal circuit in the protection area.

In one embodiment, it further includes an optocoupler device for transmitting a fault area signal, the switch area fault signal circuit and the protection area fault signal circuit are respectively connected in series with the optocoupler device, and the optocoupler device is connected to the monitoring terminal.

In one embodiment: the technical parameters of the closing monitoring relay match the technical parameters of the opening monitoring relay, and the technical parameters of the jump monitoring relay match the technical parameters of the closing monitoring relay.

Two of the adopted technical scheme that the present invention solves its technical problem is:

Based on the high-voltage switch operating circuit fault area identification system of one of the schemes, the high-voltage switch operating circuit fault area identification method includes:

When the switch mechanism is in operation or the switch mechanism is in hot standby, if a failure occurs in the switch area of the operation circuit, it includes:

Step 11, the tripping monitoring relay in the closing circuit and the closing monitoring relay in the opening circuit lose voltage and do not act, and the fault occurs in the normally closed auxiliary contact of the closing monitoring relay and the tripping monitoring relay in the diagnosis circuit Both are in the closed state and drive the control relay to act, and the normally open auxiliary contact of the control relay is closed;

Step 12, the closing monitoring relay and the opening monitoring relay of the diagnostic circuit for the faulty area operate, the corresponding normally open auxiliary contacts are closed, and the normally closed auxiliary contacts are disconnected;

Step 13, the switch area fault signal circuit of the signal loop is turned on and sends a fault area signal to the remote monitoring master station through the monitoring terminal;

When the switch is running, the operation circuit protection area fault occurs, including:

Step 21, the tripping monitoring relay in the closing circuit and the closing monitoring relay in the opening circuit lose voltage and do not act. The fault occurs in the normally closed auxiliary contacts of the closing monitoring relay and the tripping monitoring relay in the diagnosis circuit. Both are in the closed state and drive the control relay to act, and the normally open auxiliary contact of the control relay is closed;

Step 22, the closing monitoring relay of the diagnostic circuit for the fault area operates, its corresponding normally open auxiliary contact is closed, the normally closed auxiliary contact is disconnected, the opening monitoring relay does not act, its corresponding normally open auxiliary The closed auxiliary contact maintains the original state;

Step 23, the protection area fault signal circuit of the signal loop is turned on and sends the fault area signal to the remote monitoring master station through the monitoring terminal;

When the switch mechanism is in hot standby (the switch is in position, and power is about to be transmitted), a fault in the protection area of the operation circuit occurs, including:

Step 31, the tripping monitoring relay in the closing circuit and the closing monitoring relay in the opening circuit lose voltage and do not act, and the normally closed auxiliary contacts of the closing monitoring relay and the tripping monitoring relay in the diagnosis circuit for this fault occur Both are in the closed state and drive the control relay to act, and the normally open auxiliary contact of the control relay is closed;

Step 32, the opening monitoring relay of the diagnostic circuit for the fault area operates, its corresponding normally open auxiliary contact is closed, the normally closed auxiliary contact is disconnected, the closing monitoring relay does not act, its corresponding normally open auxiliary contact, The closed auxiliary contact maintains the original state;

Step 33, the protection area fault signal circuit of the signal loop is turned on and sends the fault area signal to the remote monitoring master station through the monitoring terminal;

Compared with the background technology, this technical solution has the following advantages:

The line realizes the switching area of the switching operation circuit by installing corresponding control relays, closing monitoring relays and opening monitoring relays in the closing circuit and opening circuit of the switching operation circuit, and using their auxiliary contacts as signal transmission media. Automatic identification of faults and faults in the protection area. According to the identification results of the fault area, only the rescue personnel in the corresponding fault area need to be dispatched to repair the line fault during the emergency repair process, which reduces the labor cost and improves the repair efficiency. Thereby reducing load loss.

Description of drawings

The present invention will be further described below in conjunction with drawings and embodiments.

FIG. 1 shows a schematic diagram of the closing circuit of the A-phase switch operation circuit of the first embodiment.

FIG. 2 is a schematic diagram of the first opening circuit of the A-phase switching operation circuit of the first embodiment.

FIG. 3 is a schematic diagram of the second opening circuit of the A-phase switching operation circuit of the first embodiment.

FIG. 4 is a schematic diagram of the first signal loop in the first embodiment.

FIG. 5 is a schematic diagram of the second signal loop in the first embodiment.

FIG. 6 is a schematic diagram showing the connection of the fault diagnosis circuit in the first embodiment.

FIG. 7 shows an overall schematic diagram of the fault area identification system of the high voltage switch operating circuit.

FIG. 8 is a schematic diagram showing the connection of the closing circuit, the opening circuit and the fault diagnosis circuit of the switch operation circuit in the second embodiment.

FIG. 9 is a schematic diagram of the signal circuit in the second embodiment.

Detailed ways

Please refer to Figure 1 to Figure 9:

Please refer to Figure 7, the high-voltage switch operation circuit fault area identification system, which includes:

The switch operation circuit includes a closing circuit, an opening circuit and a switch mechanism. The switching operation circuit also includes a fault diagnosis circuit with a control relay and a fault area diagnosis circuit with a closing monitoring relay and an opening monitoring relay. The control relay There are several pairs of normally open auxiliary contacts, and the closing monitoring relay and the opening monitoring relay respectively have several pairs of normally open auxiliary contacts and at least one pair of normally closed auxiliary contacts;

A signal circuit for generating and displaying the signal of the fault area of the switch operation circuit, the signal circuit includes the fault signal circuit of the switch area and the fault signal circuit of the protection area;

The monitoring terminal 3 and the remote monitoring master station 4, the signal loop signal is connected to the monitoring terminal, and the monitoring terminal network signal is connected to the remote monitoring master station;

The fault occurrence diagnosis circuit can contact the fault area diagnosis circuit through the auxiliary contact of the control relay and decide whether to allow the fault area diagnosis circuit to perform fault area diagnosis. The fault area diagnosis circuit passes the closing monitoring relay and opening monitoring relay The auxiliary contact of the auxiliary contact contacts the signal circuit, and the signal circuit identifies the fault area by whether the switch area fault signal circuit and the protection area fault signal circuit are connected, and transmits the identification result to the remote monitoring master station through the monitoring terminal

The fault area includes a switch area 1 and a protection area 2, the switch area 1 includes the switch mechanism, and the protection area 2 includes the switch operation circuit part except the switch mechanism

Example 1, please refer to Figure 1 to Figure 6:

For the switch operation circuit with a voltage level of 220kV and above, each phase of the A, B, and C phases of the three-phase line corresponds to the switch operation circuit of the A, B, and C phases, that is, each phase corresponds to a switch operation circuit . The switch operation circuit of each phase includes a closing circuit, a first opening circuit, a second opening circuit, a first power supply 100 and a second power supply 300; the closing circuit and the first opening circuit form a first group of switches An operating circuit, the closing circuit and the second opening circuit form a second group of switch operating circuits.

Fault area identification system and method for the first group of switch operation circuits:

The closing circuit and the first opening circuit are connected to both ends of the first power supply 100, the closing circuit includes a switch mechanism 10, a trip monitoring relay 11, the first opening circuit includes a switching mechanism 10, a first closing circuit A position monitoring relay 21, the first position monitoring relay 21 and the jump position monitoring relay 11 respectively have at least one pair of normally closed auxiliary contacts;

A first fault diagnosis circuit 110 is selectively connected to both ends of the first power supply 100 or the second power supply 300 through a switch. The first fault diagnosis circuit 110 includes a first control relay 12 connected in series, a first closing monitoring At least one pair of normally closed auxiliary contacts of the relay 11 and at least one pair of normally closed auxiliary contacts of the jump monitoring relay 21 .

A first fault area diagnostic circuit 120, the first fault area diagnostic circuit 120 includes a regional diagnostic circuit one 121 and a regional diagnostic circuit two 122, the regional diagnostic circuit one 121 is connected in parallel with the switching mechanism 10 of the closing circuit and is connected with the closing circuit The tripping monitoring relay 11 in the gate circuit is connected in series to both ends of the first power supply 100, and the area diagnostic circuit one 121 includes a closing monitoring relay 13 connected in series and the first pair of normally open auxiliary contacts of the first control relay 12. . The regional diagnostic circuit two 122 is connected in parallel to the switching mechanism 10 of the first opening circuit and is connected in series with the closing monitoring relay 21 in the first opening circuit to both ends of the first power supply 100. The regional diagnostic circuit two 122 A second pair of normally open auxiliary contacts comprising the first opening monitoring relay 22 and the first control relay 12 are connected in series.

A first signal circuit for generating and displaying the signal of the fault zone situation of the first group of switch operation circuits, the first signal circuit includes a third power supply 400 that provides electric energy for signal generation and is connected between the third power supply 400 The fault area signal generation circuit of the fault area signal generation circuit includes a switch area fault signal circuit 410 and a protection area fault signal circuit 420, and the switch area fault signal circuit 410 includes a third pair of normally open pairs of the first control relay 12 connected in series Auxiliary contacts, the first pair of normally open auxiliary contacts of the closing monitoring relay 13 and the first pair of normally open auxiliary contacts of the first opening monitoring relay 22, the protection area fault signal circuit 420 includes the first branch connected in series The first pair of normally closed auxiliary contacts of the gate monitoring relay 22, the second pair of normally open auxiliary contacts of the closing monitoring relay 13 or the second pair of normally open auxiliary contacts of the first opening monitoring relay 22 connected in series, the closing The first pair of normally closed auxiliary contacts of the gate monitoring relay 13, and the third pair of normally open auxiliary contacts of the first control relay 12 are respectively connected in series with the switch area fault signal circuit and the protection area fault signal circuit;

The switch area fault signal circuit 410 and the protection area fault signal circuit 420 are respectively connected in series with an optocoupler device 41 for transmitting fault area signals, and the optocoupler device is connected to the monitoring terminal 3 for signals.

The first fault occurrence diagnostic circuit 110 judges whether the operation loop occurs or not, and contacts the first fault area diagnostic circuit 120 through the auxiliary contact of the first control relay 12 to determine whether to allow the first fault area diagnostic circuit 120 to fail. Area diagnosis, the first fault area diagnosis circuit 120 connects the first signal circuit through the normally open auxiliary contact and the normally closed auxiliary contact of the closing monitoring relay 13 and the first opening monitoring relay 22, the first signal circuit Whether the switch area fault signal circuit 410 and the protection area fault signal circuit 420 are connected to determine the fault area of the faulty switch operation circuit, and the identification result is transmitted to the remote monitoring master station 4 through the monitoring terminal 3 .

The following three situations illustrate the logical action principle of the first group of switch operation circuit fault area identification:

1. When the switch mechanism is in operation or the switch mechanism is in hot standby state (the switch is in place, and power is about to be transmitted), and a fault occurs in the switch area of the operation circuit, then

(1) The trip monitoring relay 11 in the closing circuit (1TWJa, 2TWJa, 3TWJa in the figure), and the first closing monitoring relay 21 in the opening circuit (11HWJa, 12HWJa, 13HWJa in the figure) lose voltage Action, its normally closed auxiliary contacts are all in the closed state, at this time the first control relay 12 (1ZKa in the figure) is driven, and the normally open auxiliary contacts of the first control relay 12 are closed, that is, the first fault diagnosis circuit diagnosis Out of the first set of switch operation circuit failure.

(2) When the switch area fails, between the two ends of the switching mechanism 10 of the closing circuit (between 7A and n29 in the figure), between the two ends of the switching mechanism 10 of the first opening circuit (between 137A and n29 in the figure) ) is equivalent to an open circuit, there is a potential difference between 7A and n29, 137A and n29, at this time the jump monitoring relay 11 and the first closing monitoring relay 21 should not act, the closing monitoring relay 12 and the first opening monitoring relay 22 Action, the normally open auxiliary contact is closed, and the normally closed auxiliary contact is opened. Among them: the potential difference between the closing circuit 7A and n29 is determined by the jump monitoring relay 1 and the closing monitoring relay 13 and then added to the closing monitoring relay 13 to determine, the potential difference between the opening circuit 137A and n29 is determined by the first The closing monitoring relay 21 and the first opening monitoring relay 22 are divided and added to the first opening monitoring relay 22 (1ZTJa in the figure) to determine. The closing monitoring relay 13 and the first opening monitoring relay 22 must be based on the technical parameters. selection (described below).

(3) Since the first control relay 12, the closing monitoring relay 13, and the first opening monitoring relay of the operating circuit all operate, their normally open auxiliary contacts are closed, and their normally closed auxiliary contacts are disconnected, the fault signal circuit in this switch area Conduction, so the "switch area failure of the first group of switch operation loop" signal is reported in the first signal loop.

2. When the switch is running, if there is a fault in the protection area of the operating circuit, then

(1) The trip monitoring relay 11 in the closing circuit (1TWJa, 2TWJa, 3TWJa in the figure), and the first closing monitoring relay 21 in the first opening circuit (11HWJa, 12HWJa, 13HWJa in the figure) are out of order. If the pressure does not work, its normally closed auxiliary contacts are all in the closed state. At this time, the first control relay 12 (1ZKa in the figure) is driven, and the normally open auxiliary contacts of the first control relay 12 are closed.

(2) When the protection area is faulty, because the switch mechanism is in the closing position, the circuit itself is in an open circuit state and there is a potential difference between the two ends of the closing circuit 7A and n29, and the closing monitoring relay operates; because the switching mechanism is not faulty, it is in the waiting trip state , The loop resistance between 137A and n29 is much smaller than the first opening monitoring relay, which is equivalent to short-circuiting the opening monitoring relay and will not act. At the same time, due to the fault in the protection area, the jump monitoring relay 11 and the closing monitoring relay 21 will not operate. , so the first control relay 12 will not fail to realize the area identification function due to resetting.

(3) Since the first control relay 12 and the closing monitoring relay 13 of the operating circuit act, and the first opening monitoring relay 12 does not act, the normally open auxiliary contact is closed, and the normally closed auxiliary contact is disconnected, and the protection area fault signal The circuit is turned on, so the "protection area failure of the first group of switch operation circuits" signal is reported in the first signal circuit.

3. When the switch mechanism is in hot standby (the switch position is about to transmit power), and a fault occurs in the protection area of the operation circuit, then

(1) The trip monitoring relay 11 in the closing circuit (1TWJa, 2TWJa, 3TWJa in the figure), and the first closing monitoring relay 21 in the first opening circuit (11HWJa, 12HWJa, 13HWJa in the figure) are out of order. If the pressure does not work, its normally closed auxiliary contacts are all in the closed state. At this time, the first control relay 12 (1ZKa in the figure) is driven, and the normally open auxiliary contacts of the first control relay 12 are closed.

(2) When the protection area is faulty, because the switch mechanism is tripping, there is a potential difference between the two ends of the opening circuit 137A and the n29 switch mechanism, and there is a potential difference, the first opening monitoring relay operates; because the switch mechanism is faultless, it is waiting In the closing state, the loop resistance between 7A and n29 is much smaller than the closing monitoring relay, which is equivalent to short-circuiting the closing monitoring relay without action. At the same time, due to the failure of the protection area, the closing monitoring relay 11 and the jump monitoring relay 21 No action, so the first control relay 12 will not fail to realize the area identification function due to resetting.

(3) Since the first control relay 12 of the operation circuit, the first opening monitoring relay 22 act, and the closing monitoring relay 13 does not act, the normally open auxiliary contact is closed, and the normally closed auxiliary contact is disconnected, and the protection area fault signal The circuit is turned on, so the signal "protection zone fault of the first group of switching operation circuits" is generated in the first signal circuit.

The fault area identification system and method of the first group of switch operation loops in this embodiment have been described above, and the fault area identification system and method of the second group of switch operation circuits in this embodiment are similar to those of the first group of switch operation loops. Wherein, the second opening circuit of the second group of switch operation circuits is connected to both ends of the second power supply 300, and the second opening circuit includes a switch mechanism 10 and a second closing monitoring relay 31. The second group of switch operation The circuit includes a second fault diagnosis circuit 130 and a second fault region diagnosis circuit 140 with the same circuit structure as the first group of switch operation circuits, the second fault diagnosis circuit 130 includes a second control relay 14, and the second fault region The diagnosis circuit 140 includes a second opening monitoring relay 32, the second opening monitoring relay has at least one pair of normally closed auxiliary contacts and several pairs of normally open auxiliary contacts, the second fault area diagnosis circuit 140 includes a The area diagnostic circuit three 141 at both ends of the switching mechanism 10 of the closing circuit and the area diagnostic circuit four 142 connected in parallel to the two ends of the switching mechanism 10 of the second opening circuit; the second fault diagnosis circuit 130 is selectively connected to the first Two ends of the power supply 100 or two ends of the second power supply 300 (if the first power supply is powered off, the second power supply will be automatically switched, and if the second power supply is powered off, the first power supply will be automatically switched). Among them: the second closing monitoring relay 31 and its auxiliary contacts, the second control relay 14 and its auxiliary contacts, the second opening monitoring relay 32 and its auxiliary contacts of the second fault diagnosis circuit and the second fault area diagnosis circuit. The auxiliary contacts respectively replace the first closing monitoring relay 11 and its auxiliary contacts, the first control relay 12 and its auxiliary contacts, and the first opening monitoring relay 22 and its auxiliary contacts;

This embodiment also includes a second signal circuit for generating and displaying signals of the fault area of the second group of switch operation circuits, the second signal circuit is connected to the two ends of the third power supply 400, the second signal circuit The loop and the first signal loop have the same circuit structure, wherein: the normally open auxiliary contact of the second control relay 14 in the second signal loop and the auxiliary contact of the second opening monitoring relay 32 respectively correspond to the first signal The normally open auxiliary contact of the first control relay 12 and the auxiliary contact of the first opening monitoring relay 22 of the circuit.

In this embodiment: the first control relay 12 and the second control relay 14 respectively have three pairs of normally open auxiliary contacts, and the closing monitoring relay 13 has four pairs of normally open auxiliary contacts and two pairs of normally closed auxiliary contacts. Point, the first opening monitoring relay 22 and the second opening monitoring relay 32 respectively have two pairs of normally open auxiliary contacts and a pair of normally closed auxiliary contacts.

Closing monitoring relay 13, the first opening monitoring relay 22, the selection method of the technical parameters of the second opening monitor:

Here, the operating voltage of the closing monitoring relay, the opening monitoring relay, the tripping monitoring relay, and the closing monitoring relay must match. In the operation circuit of 220kV and above, the total resistance value of the jump position monitoring relay and the total resistance value of the close position monitoring relay are about 20kΩ respectively, and the total rated voltage is 220V (if it is divided into several relays, the sum of the resistance values of each relay is 20kΩ, The total rated voltage is 220V, the rated voltage of a single relay is about 220/n, and n is the number of relays; if a resistor R is connected in series, the total resistance value of each relay resistance and the resistor R is 20kΩ, and the rated voltage of a single relay is ( 220-220*R/20)/n); its operating voltage should be less than 110V, that is, 50% of the rated voltage (if it is divided into several relays, the operating voltage of each relay should be less than 110/n, n is the number of relays; if a series With the resistance R, the operating voltage of each relay should be less than (110-110*R/20)/n). When the operation circuit fails, the trip monitoring relay and the closing monitoring relay, the closing monitoring relay and the opening monitoring relay form a circuit for voltage division.

When the tripping monitoring relay and the closing monitoring relay do not act at the same time (that is, when the operation circuit fails), the closing monitoring relay and the opening monitoring relay should act on the partial pressure formed by the open circuit due to the failure of the switch mechanism. In order to ensure that ZHJ and ZTJ can operate reliably, similarly, if a single relay is used, the operating voltage should be lower than 110V, and the rated voltage is 220V, then the resistance value should be greater than 20kΩ; if n relay groups are connected in series, the operating voltage of a single relay should be If it is lower than 110/n and the rated voltage is 220/n, then the resistance value of a single relay should be greater than (20/n) kΩ; if n relays are connected in series with resistor R, the operating voltage of a single relay should be lower than (110-110* R/20)/n), the rated voltage is (220-220*R/20)/n), and the resistance value should be greater than (20-R)/n.

Example 2, please refer to Figure 8 and Figure 9:

For the switch operation circuit below 220kV, each phase of the three-phase line corresponds to the same switch operation circuit, and the switch operation circuit controls the linkage mechanism on the primary side of the switch mechanism through the opening and closing coils to realize the opening and closing of the three-phase switch. close. The switch operation circuit only includes a closing circuit and an opening circuit, and its fault area identification system and method are similar to the first group of switch operation circuits or the second group of switch operation circuits in the first embodiment. The switch operation circuit in this embodiment is powered by only one power supply, and its fault diagnosis circuit is connected to the power supply.

In this embodiment, the control relay has two pairs of normally open auxiliary contacts, and the closing monitoring relay and opening monitoring relay respectively have two pairs of normally open auxiliary contacts and a pair of normally closed auxiliary contacts.

For the switch operation circuit below 220kV, the relay parameter selection method in its fault occurrence diagnostic circuit and fault area diagnostic circuit is the same as that described in Embodiment 1, except that the total resistance value of its jump position monitoring relay, the closing position monitoring relay The total resistance value is about 40kΩ respectively.

Through the high-voltage switch operation circuit fault area identification system and method, our maintenance personnel can directly check the fault area signal (switch area fault signal or protection area fault signal) at the remote monitoring master station, and assign corresponding professional maintenance personnel to the scene Troubleshooting, in this way, there is no need for two groups of professionals to go to the site to locate the fault, which reduces the labor force, shortens the fault processing time, and reduces the risk of expanding accidents.

The above is only a preferred embodiment of the present invention, so the scope of the present invention cannot be limited accordingly, that is, the equivalent changes and modifications made according to the patent scope of the present invention and the content of the specification should still be covered by the present invention within range.

Claims (8)

1. high-voltage switch gear operation circuit fault zone identification system, is characterized in that: comprising:

Switching manipulation loop, this switching manipulation loop comprises closing circuit, sub-gate circuit, fault generation diagnostic circuit and fault zone diagnostic circuit, this closing circuit and sub-gate circuit all comprise a switching mechanism, this fault generation diagnostic circuit comprise have some to often driving the pilot relay of auxiliary contact, this fault zone diagnostic circuit comprise all have respectively some to often driving combined floodgate supervisory relay and the separating brake supervisory relay of auxiliary contact and normally closed auxiliary contact;

For generation of with the signal circuit of the signal of display switch operation circuit fault zone, this signal circuit comprises switch region fault signal circuit and protection zone fault signal circuit;

Monitor terminal and remote monitoring main website, this signal circuit signal connects this monitor terminal, and this monitor terminal network signal connects this remote monitoring main website;

This fault generation diagnostic circuit can contact this fault zone diagnostic circuit by the auxiliary contact of this pilot relay and also determine whether allow this fault zone diagnostic circuit to carry out fault zone diagnosis; this fault zone diagnostic circuit contacts this signal circuit by the auxiliary contact of this combined floodgate supervisory relay and separating brake supervisory relay; by switch region fault signal circuit and protection zone fault signal circuit, whether conducting comes this fault zone of identification to this signal circuit, and this identification result is sent to this remote monitoring main website by monitor terminal.

2. high-voltage switch gear operation circuit according to claim 1 fault zone identification system, it is characterized in that: this closing circuit comprises jumps position supervisory relay, this sub-gate circuit comprises co-bit supervisory relay, this co-bit supervisory relay and a jumping position supervisory relay all have respectively at least one pair of normally closed auxiliary contact, and this fault generation diagnostic circuit comprises the normally closed auxiliary contact of the co-bit supervisory relay being connected in series, normally closed auxiliary contact and the pilot relay of jumping position supervisory relay;

This fault zone diagnostic circuit comprises the region diagnostic circuit one being connected in closing circuit and is connected in the region diagnostic circuit two in sub-gate circuit, and this region diagnostic circuit one comprises that the combined floodgate supervisory relay at the two ends that are connected in series in this switching mechanism, the first couple of pilot relay often drive auxiliary contact; This region diagnostic circuit two comprises that the separating brake supervisory relay at the two ends that are connected in series in this switching mechanism, the second couple of pilot relay often drive auxiliary contact.

3. high-voltage switch gear operation circuit according to claim 2 fault zone identification system, is characterized in that: this switching manipulation loop also comprises the first power supply, this fault generation diagnostic circuit is connected to this first both ends of power.

4. high-voltage switch gear operation circuit according to claim 3 fault zone identification system, is characterized in that: this switching manipulation loop also comprises second source, this fault generation diagnostic circuit is selectively connected to this first both ends of power or second source two ends.

5. high-voltage switch gear operation circuit according to claim 1 fault zone identification system, is characterized in that: this switch region fault signal circuit comprises that the first couple that the first couple of the combined floodgate supervisory relay being connected in series often drives auxiliary contact, separating brake supervisory relay often drives auxiliary contact; This protection zone fault signal circuit comprises that the second couple of the combined floodgate supervisory relay being connected in series often opens first pair of normally closed auxiliary contact of auxiliary contact, separating brake supervisory relay and first pair of normally closed auxiliary contact of the combined floodgate supervisory relay that is connected in series, the second couple of separating brake supervisory relay are often driven auxiliary contact, often drives auxiliary contact and is connected in series respectively this switch region fault signal circuit, protection zone fault signal circuit for the 3rd pair of this pilot relay.

6. high-voltage switch gear operation circuit fault zone identification system according to claim 1 or 5; it is characterized in that: also comprise the optocoupler for transmitting fault zone signal; this switch region fault signal circuit and protection zone fault signal circuit are connected in series respectively this optocoupler, and this optocoupler signal connects this monitor terminal.

7. high-voltage switch gear operation circuit according to claim 2 fault zone identification system, it is characterized in that: the technical parameter of the technical parameter of this co-bit supervisory relay and separating brake supervisory relay matches, the technical parameter of this jumping position supervisory relay and the technical parameter of combined floodgate supervisory relay match.

8. high-voltage switch gear operation circuit fault zone discrimination method, the high-voltage switch gear operation circuit fault zone identification system based on described in any one in claim 1-7, is characterized in that:

In the time of switching mechanism operation or switching mechanism stand-by heat, there is operation circuit switch region fault, comprise:

Step 11, jumping position supervisory relay in closing circuit, the equal decompression of co-bit supervisory relay in sub-gate circuit is failure to actuate, co-bit supervisory relay in this fault generation diagnostic circuit and the normally closed auxiliary contact of jumping position supervisory relay be all in closure state and drive pilot relay action, and this pilot relay often open auxiliary contact closure;

Step 12, the action of the combined floodgate supervisory relay of this fault zone diagnostic circuit and separating brake supervisory relay, its correspondence often open auxiliary contact closure, normally closed auxiliary contact disconnects;

Step 13, the switch region fault signal circuit conducting of this signal circuit also sends fault zone signal by monitor terminal to remote monitoring main website;

In the time that switch moves, there is operation circuit protection zone fault, comprise:

Step 21, jumping position supervisory relay in closing circuit, the equal decompression of co-bit supervisory relay in sub-gate circuit is failure to actuate, co-bit supervisory relay in this fault generation diagnostic circuit and the normally closed auxiliary contact of jumping position supervisory relay be all in closure state and drive pilot relay action, and this pilot relay often open auxiliary contact closure;

Step 22, the combined floodgate supervisory relay action of this fault zone diagnostic circuit, its correspondence often open auxiliary contact closure, normally closed auxiliary contact disconnects, separating brake supervisory relay is failure to actuate, its correspondence often drive auxiliary contact, normally closed auxiliary contact keeps original state;

Step 23, the protection zone fault signal circuit conducting of this signal circuit also sends fault zone signal by monitor terminal to remote monitoring main website;

When switching mechanism is when stand-by heat (switch divides position, by power transmission), there is operation circuit protection zone fault, comprise:

Step 31, jumping position supervisory relay in closing circuit, the equal decompression of co-bit supervisory relay in sub-gate circuit is failure to actuate, co-bit supervisory relay in this fault generation diagnostic circuit and the normally closed auxiliary contact of jumping position supervisory relay be all in closure state and drive pilot relay action, and this pilot relay often open auxiliary contact closure;

Step 32, the separating brake supervisory relay action of this fault zone diagnostic circuit, its correspondence often open auxiliary contact closure, normally closed auxiliary contact disconnects, combined floodgate supervisory relay is failure to actuate, its correspondence often drive auxiliary contact, normally closed auxiliary contact keeps original state;

Step 33, the protection zone fault signal circuit conducting of this signal circuit also sends fault zone signal by monitor terminal to remote monitoring main website.

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