CN217156738U - Special tester for three-phase inconsistent protection circuit of circuit breaker - Google Patents

Abstract

The utility model relates to a special tester for a three-phase inconsistent protection circuit of a circuit breaker, comprising a chassis, a controller, a control panel, a timer and a rechargeable battery are arranged on the chassis, a charging socket is arranged on the control panel, and the The control panel includes a control area, a signal area, a key area and a display area. The control area is provided with a common terminal wiring hole, a closing wiring hole, an opening wiring hole and a control switch. The signal area includes a signal common wiring hole, 6 1 phase wiring hole and 6 phase position signal indicators, the button area is provided with emergency stop button, closing timing button and opening timing button, the display area is provided with a liquid crystal display screen, and the liquid crystal display screen is used for Displaying the time measured by the timer, the tester can make the test process more simple and convenient.

Description

A special tester for three-phase inconsistent protection circuit of circuit breakers

【Technical field】

The utility model relates to a special tester for three-phase inconsistent protection circuits of circuit breakers, which belongs to the technical field of circuit breaker testers.

【Background technique】

The circuit breaker three-phase inconsistent protection circuit test is a key test item in the annual inspection of 220kV circuit breakers in substations. At the maintenance site, maintenance personnel can use two methods to complete the circuit breaker three-phase inconsistent protection secondary circuit test. The test has two purposes , on the one hand, check whether the circuit breaker has the function of three-phase inconsistency protection, and on the other hand, whether the delay of the three-phase inconsistency protection time relay is within the error range compared with the fixed value.

The first method, the maintenance personnel can use the comprehensive relay protection verification device;

(1) Complete the test wiring in the outdoor field, transmit the action command of the circuit breaker, and receive the relevant action signal of the circuit breaker;

(2) The button triggers the test, and the maintenance personnel observe whether the three-phase inconsistent protection of the circuit breaker operates correctly;

(3) Compare whether the three-phase inconsistency time measured by the verification device is within the error range compared with the fixed value.

The second method, referred to as the "message method", uses the time to generate a message after the circuit breaker operates to complete the test:

(1) A maintenance person uses short-circuit wiring outdoors to short-circuit the action contact of the circuit breaker. The circuit breaker operates and is in a state of three-phase inconsistency of A, B, and C. After a certain delay, the three-phase inconsistency protection action;

(2) Another maintenance personnel searches for the two action messages of the circuit breaker on the background machine of the indoor main control room, and calculates the time interval between the two messages before and after, that is, the three-phase inconsistency time.

It is very inconvenient and low in efficiency to use the comprehensive relay protection device to complete the secondary circuit test of the three-phase inconsistent protection. The reasons are as follows:

(1) The comprehensive relay protection device must be connected to 220V AC. However, the power source box on the outdoor site of the substation is far away, and the winding reel of the power box is often required to be 10 meters away to supply power to the calibration device;

(2) The weight of the comprehensive relay protection device is 40 kilograms and needs two maintenance personnel to carry it.

Using the "message method" to complete the three-phase inconsistency protection secondary circuit test test, although there is no need to carry a cumbersome calibration device, it is also very inconvenient. The reasons are as follows:

(1) It is impossible to complete the time measurement on the outdoor site, and two people indoors and outdoors need to cooperate with each other by telephone;

(2) During the annual inspection process, multiple planes often work at the same time, and a large number of messages will be generated in the background of the main control room. The refresh speed is fast, and it is very inconvenient to find the corresponding message.

【Content of utility model】

The technical problem to be solved by the utility model is to provide a special tester for the three-phase inconsistent protection circuit of a circuit breaker, which can make the test process simpler and more convenient.

To solve the above-mentioned technical problems, the utility model adopts the following technical solutions:

A special tester for three-phase inconsistent protection circuits of circuit breakers, comprising a chassis, a controller, a control panel, a timer and a rechargeable battery are arranged on the chassis, a charging socket is arranged on the control panel, and the control panel includes a control panel. area, signal area, key area and display area, the control area is used to control the closing and opening of the three-phase phase of the circuit breaker, and the control area is provided with a common terminal wiring hole, a closing wiring hole, an opening Wiring hole and control switch, the signal area is used to display the position status of the circuit breaker phase, the signal area includes a signal common wiring hole, 6 phase wiring holes and 6 phase position signal indicators, the key area There is an emergency stop button, a closing timing button and an opening timing button. The emergency stop button is used to terminate the execution of the controller and return to the initial state. The closing timing button is used to issue a closing command. The opening timing button is used to issue an opening command, the display area is provided with a liquid crystal display screen, and the liquid crystal display screen is used to display the time measured by the timer.

The beneficial effects of adopting the utility model are:

When the utility model is used, the phase normally open contacts and normally closed contacts of the circuit breaker operating mechanism are connected with the six phase wiring holes, and the six phase position signal indicators are used to display the phase position of the circuit breaker. , connect the common terminal wiring hole to the control power positive terminal block of the circuit breaker operating mechanism box through the test line, the closing wiring hole is connected to the terminal block transmitting the phase closing command in the circuit breaker operating mechanism box, and the opening wiring hole is connected to the terminal block of the circuit breaker operating mechanism box. Enter the terminal block of the circuit breaker operating mechanism box to transmit the opening command, open the control switch, when the three-phase initial positions of the circuit breaker are all closed, press the opening timing button, the utility model sends out the A-phase separation When the controller detects that the position states of the three phases are inconsistent, the timer starts timing, and after the three-phase inconsistency protection setting delay, the three-phase inconsistency protection acts, A three-phase tripping command is issued, the circuit breaker trips three-phase, and the timer stops timing at this time, the liquid crystal display realizes the time measured by the timer, and the time displayed by the maintenance personnel through the liquid crystal display is the same as By comparing the fixed values, it can be concluded whether the three-phase inconsistency protection time is within the error range. The utility model can detect whether the circuit breaker has the three-phase inconsistency protection function through simple wiring and key operation, and can also determine the three-phase inconsistency protection function. Whether the phase inconsistency protection time is within the error range, the operation of the utility model is simple and convenient, which can be completed by only one person, which can save a lot of human resources. The detection result can be obtained at the first time, and the detection efficiency of the maintenance personnel is improved.

In the utility model, the case is provided with a rechargeable battery, and the control panel is provided with a charging socket. The utility model can be used by maintenance personnel by hand, and at the same time, no external power supply is required, so that the wiring of the utility model is simpler and more convenient. It can be carried by maintenance personnel to save human resources.

Preferably, the phase wiring holes include A-phase combined wiring holes, A-phase split wiring holes, B-phase combined wiring holes, B-phase split wiring holes, C-phase combined wiring holes, and C-phase split wiring holes.

Preferably, the phase position signal indicator lights include A-phase combined position lamps, A-phase split position lamps, B-phase combined position lamps, B-phase split position lamps, C-phase combined position lamps and C-phase split position lamps.

Preferably, the control panel is provided with a power switch and a power indicator, the rechargeable battery supplies power to the tester after the power switch is turned on, and the power indicator lights up.

Preferably, a charging indicator light is provided on the control panel, when the rechargeable battery is in a charging state, the charging indicator light is on, and a breakdown diode for protecting the rechargeable battery is installed in the rechargeable battery.

Preferably, the control panel is provided with a ground connection hole for protective grounding.

Preferably, the controller is a PLC.

Preferably, the rechargeable battery is a lithium battery.

Preferably, the size of the case is 250*150*100mm, and the weight of the case is 1kg.

Other features and advantages of the present invention will be disclosed in detail in the following specific embodiments and accompanying drawings.

【Description of drawings】

The utility model will be further described below in conjunction with the accompanying drawings:

1 is a schematic structural diagram of a control panel in an embodiment of the present invention;

2 is a circuit diagram of a rechargeable battery in an embodiment of the present utility model;

Fig. 3 is the circuit diagram of the control area in the embodiment of the utility model;

4 is a circuit diagram of a signal area in an embodiment of the present invention;

5 is a circuit diagram of a key area in an embodiment of the present utility model;

6 is a circuit diagram of a timer in an embodiment of the present invention;

FIG. 7 is a circuit diagram of a controller in an embodiment of the present invention.

【Detailed ways】

The technical solutions of the embodiments of the present utility model will be explained and described below with reference to the accompanying drawings of the embodiments of the present utility model, but the following embodiments are only preferred embodiments of the present utility model, not all. Based on the examples in the implementation manner, other examples obtained by those skilled in the art without creative work, all belong to the protection scope of the present invention.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", The orientation or positional relationship indicated by "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise", etc. is based on The orientation or positional relationship shown in the accompanying drawings is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood To limit the utility model.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as "first" or "second" may expressly or implicitly include one or more of that feature. In the description of the present invention, "plurality" means two or more, unless otherwise expressly defined.

In the present utility model, unless otherwise expressly specified and limited, the terms "installation", "connection", "connection", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; it can be mechanical connection or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

As shown in Figures 1 to 7, this embodiment shows a special tester for three-phase inconsistent protection circuits of circuit breakers, including a chassis. The size of the chassis in this embodiment is 250*150*100mm, and the weight of the chassis It is 1kg, and the material of the case shell is polypropylene material. The overall structure of this embodiment is small in volume and weight, which can be hand-held and operated by maintenance personnel, which is convenient for maintenance personnel to carry and operate. A controller, a control panel 1, a timer and a rechargeable battery are provided, the control panel 1 is provided with a charging socket 17, the charging socket 17 is an AC220V charging socket 17, and a charging indicator light is provided on the control panel 1 182, as shown in FIG. 2, when the charging socket 17 is inserted into the charging cable, and the AC220V voltage is input from the outside, the charging indicator light 182 on the control panel 1 will light up, and the inverter will output 24V DC power to the battery continuously. The rechargeable battery in the embodiment is charged. In this embodiment, the rechargeable battery is a lithium battery, and a breakdown diode for protecting the rechargeable battery is installed in the rechargeable battery. When the charging current is too large, the breakdown diode The diode is broken down and the charging circuit is disconnected, which can protect the rechargeable battery. The control panel 1 is provided with a power switch ZKK1 and a power indicator 181. When the power switch ZKK1 is turned on, the The rechargeable battery provides power for this embodiment, and the power indicator 181 on the control panel 1 lights up.

In this embodiment, the control panel 1 includes a control area, a signal area, a key area and a display area. The control area is used to control the closing and opening of the three-phase phase of the circuit breaker. The control area is provided with a common Terminal wiring hole 131, closing wiring hole 132, opening wiring hole 133 and control switch ZKK2, connect the common terminal wiring hole 131 to the control power positive terminal block of the circuit breaker operating mechanism box through the test line, and the closing wiring hole 132 It is connected to the terminal block of the circuit breaker operating mechanism box to transmit the closing command of A-phase (or B-phase, C-phase), and the opening wiring hole 133 is connected to the circuit-breaker operating mechanism box to transmit A-phase (or B-phase, C-phase) The terminal block of the opening command is shown in Figure 3. After the test wiring is completed, when the control switch ZKK2 on the control panel 1 is closed, if the contacts 9 and 5 in J1 are turned on, the circuit breaker operating mechanism will be sent to the circuit breaker operating mechanism. The box issues a closing command, and one of the phases A, B, and C of the circuit breaker that receives the command will be closed. If the contacts 9 and 5 in J2 are turned on, an opening command will be issued to the circuit breaker operating mechanism box, and one phase of the circuit breaker A, B, and C phases that receive the command will be opened, and the J1 and J2 The on and off contacts are controlled by the controller to achieve predetermined functions.

The signal area includes signal common wiring holes 117, 6 phase wiring holes and 6 phase position signal indicator lights, and the 6 phase wiring holes include A-phase connection hole 111, A-phase sectional connection hole 112, B-phase connection hole 111 Position wiring hole 113, B-phase sectional wiring hole 114, C-phase combined position wiring hole 115, and C-phase sectional wiring hole 116; the six phase position signal indicators include A-phase combined position lamp 121, A-phase split position lamp 122 , B phase combined position lamp 123, B phase split position lamp 124, C phase combined position lamp 125 and C phase split position lamp 126; the signal area is used to monitor the position status of the circuit breaker A, B and C phases; as shown in the figure As shown in 4, the A-phase combined position wiring hole 111 is connected to the normally open contact of the A-phase of the circuit breaker operating mechanism, the A-phase sub-position wiring hole 112 is connected to the normally closed contact of the A-phase of the circuit breaker operating mechanism box, and the signal is common. There is a weak current of +24V at the end, and it is connected to the other end of the contact. When the A phase of the circuit breaker is in the closing position, the normally open contact of the A phase is closed, and the normally closed contact of the A phase is disconnected, then the signal common terminal is connected to the A phase. The bit terminal is turned on, and at the same time, the signal common terminal is disconnected from the A-phase split terminal, the A-phase combined position lamp 121 is on, and the A-phase split position lamp 122 is off.

When the A-phase of the circuit breaker is in the split position, the normally open contact of the A-phase is disconnected, and the normally-closed contact of the A-phase is closed, then the signal common terminal and the A-phase split terminal are connected at the same time, and the signal common terminal is connected to the A-phase terminal at the same time. When the terminal at the conjunctive position is disconnected, the A-phase sub-position lamp 122 is on, and the A-phase conjunctive position lamp 121 is off.

The principle of monitoring the position state of the B-phase and the C-phase in this embodiment is the same as the above-mentioned principle of monitoring the position state of the A-phase, so it is not repeated here.

In this embodiment, the button area is provided with an emergency stop button, a closing timing button and an opening timing button. The circuit diagram of the button area is shown in FIG. 5 , and the emergency stop button is used to terminate the execution of the controller. And back to the initial state, the closing timing button is used to issue a closing command, and the opening timing button is used to issue an opening command.

In this embodiment, the display area is provided with a liquid crystal display screen, and the liquid crystal display screen is used to display the time measured by the timer. The control panel is provided with a grounding wiring hole 14, and the grounding wiring hole 14 It is used for grounding this embodiment, which belongs to protective grounding, which can prevent the operator from getting electric shock and improve the work safety of the operator; in addition, the controller in this embodiment adopts PLC control technology, and the controller can be cured by writing a program. To the processor, trigger the corresponding program by pressing the button, so as to control the above circuits and complete the preset function.

The detection method of this embodiment is as follows: In this embodiment, the control area is connected to the A-phase control terminal block as an example, and the principle of connecting the control area to the B-phase and C-phase is the same as that of the A-phase connection, so it is not necessary to to repeat them one by one;

When the initial three-phase positions of the circuit breaker are all closed, after the test wiring in the signal area is completed, the A-phase combined position lamp 121, the B-phase combined position lamp 123, and the C-phase combined position lamp 125 are all on; this implementation In the example, the opening wiring hole 133 on the control board is connected to the A-phase opening command terminal block of the circuit breaker, and the opening timing button is pressed. In this embodiment, the A-phase opening command is issued, and the circuit breaker Phase A is switched off; after phase A of the circuit breaker is switched off, in this embodiment, the A-phase combined position lamp 121 is off, and the A-phase split position lamp 122 is on; at this time, the controller detects that A, B, The position states of the three phases of C are inconsistent, that is, the circuit breaker is in a three-phase inconsistent state. At this time, the timer starts timing; after the circuit breaker has passed the three-phase inconsistent protection setting delay, the three-phase inconsistent protection acts and sends out Three-phase tripping command, the circuit breaker trips three-phase, so that the A-phase splitting lamp 122, the B-phase splitting lamp 124, and the C-phase splitting lamp 126 are all on, and the timer is at this time. Stop timing; the time recorded by the timer is displayed on the display screen, and the time displayed on the display screen is the measured three-phase inconsistency time, and the maintenance personnel will compare it with the fixed value to determine whether the three-phase inconsistency protection time is within Within the error range, the test is over.

When the three-phase initial positions of the circuit breaker are all divided, after the test wiring of the signal area is completed, the A-phase dividing light 122, B-phase dividing light 124, and C-phase dividing light 126 are all on. ; In this embodiment, the closing wiring hole 132 on the control board is connected to the circuit breaker A phase closing command terminal block, and the closing timing button is pressed, and the A phase closing command is issued in this embodiment. A phase of the circuit breaker is closed; after the A phase of the circuit breaker is closed, in this embodiment, the A-phase division light 122 is off, and the A-phase closing light 121 is on; at this time, the controller detects A, B, C The position states of the three phases are inconsistent, that is, the circuit breaker is in a three-phase inconsistent state. At this time, the timer starts timing; after the circuit breaker has passed the three-phase inconsistent protection setting delay, the three-phase inconsistent protection acts, and a three-phase inconsistent protection is issued. Phase trip command, the circuit breaker trips three-phase, so that the A-phase fractional light 122, the B-phase fractional light 124, and the C-phase fractional light 126 are all turned on, and the timer stops at this time. Timing; the time recorded by the timer is displayed on the display screen, and the time displayed on the display screen is the measured three-phase inconsistency time, and the maintenance personnel will compare it with the fixed value to determine whether the three-phase inconsistency protection time is in error. range, the test ends.

The operation of this embodiment is simple and convenient, which can be completed by only one person, which can save a lot of human resources. In addition, the three-phase inconsistency protection time is intuitively displayed through the liquid crystal display screen, so that the maintenance personnel can obtain the detection results at the first time, which improves the In addition, in this embodiment, the case is provided with a rechargeable battery, and the control panel 1 is provided with a charging socket 17. This embodiment can be used by maintenance personnel by hand, and an external power supply is not required, so this embodiment The wiring is simpler, and it is more convenient for maintenance personnel to carry, saving human resources.

The above are only specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Those skilled in the art should understand that the present utility model includes but is not limited to the accompanying drawings and the above specific embodiments. content described in. Any modifications that do not depart from the functional and structural principles of the present invention are intended to be included in the scope of the claims.

Claims (9)

1. The utility model provides a special tester of inconsistent protection circuit of circuit breaker three-phase which characterized in that: the intelligent control device comprises a case, wherein a controller, a control panel, a timer and a rechargeable battery are arranged on the case, a rechargeable socket is arranged on the control panel, the control panel comprises a control area, a signal area, a key area and a display area, the control area is used for controlling the switching-on and switching-off of three-phase phases of the circuit breaker, the control area is provided with a public end wiring hole, a switching-on wiring hole, a switching-off wiring hole and a control switch, the signal area is used for displaying the position state of the phases of the circuit breaker, the signal area comprises a signal public wiring hole, 6 phase wiring holes and 6 phase position signal indicating lamps, the key area is provided with an emergency stop key, a switching-on timing key and a switching-off timing key, the emergency stop key is used for stopping the execution of the controller and returning to the initial state, the switching-on timing key is used for sending a switching-on command, and the switching-off timing key is used for sending a switching-off command, the display area is provided with a liquid crystal display screen, and the liquid crystal display screen is used for displaying the time measured by the timer.

2. The special tester for the three-phase inconsistent protection circuit of the circuit breaker according to claim 1, wherein: the phase wiring hole comprises an A-phase joint wiring hole, an A-phase branch wiring hole, a B-phase joint wiring hole, a B-phase branch wiring hole, a C-phase joint wiring hole and a C-phase branch wiring hole.

3. The special tester for the three-phase inconsistent protection circuit of the circuit breaker according to claim 1, wherein: the phase position signal indicator lamp comprises an A phase combination lamp, an A phase split lamp, a B phase combination lamp, a B phase split lamp, a C phase combination lamp and a C phase split lamp.

4. The special tester for the three-phase inconsistent protection circuit of the circuit breaker according to claim 1, wherein: the control panel is provided with a power switch and a power indicator lamp, after the power switch is turned on, the rechargeable battery supplies power to the tester, and the power indicator lamp is turned on.

5. The special tester for the three-phase inconsistent protection circuit of the circuit breaker according to claim 1, wherein: the charging indicating lamp is arranged on the control panel, when the rechargeable battery is in a charging state, the charging indicating lamp is turned on, and a breakdown diode used for protecting the rechargeable battery is installed in the rechargeable battery.

6. The special tester for the three-phase inconsistent protection circuit of the circuit breaker according to claim 1, wherein: and the control panel is provided with a grounding wiring hole for protecting grounding.

7. The special tester for the three-phase inconsistent protection circuit of the circuit breaker according to claim 1, wherein: the controller is a PLC.

8. The special tester for the three-phase inconsistent protection circuit of the circuit breaker according to claim 1, wherein: the rechargeable battery is a lithium battery.

9. The special tester for the three-phase inconsistent protection circuit of the circuit breaker according to claim 1, wherein: the size of the cabinet is 250 x 150 x 100mm, and the weight of the cabinet is 1 kg.

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