CN201319358Y

CN201319358Y - Low voltage circuit breaker

Info

Publication number: CN201319358Y
Application number: CNU2008202038906U
Authority: CN
Inventors: 肖孟章; 欧允雄; 梁可标
Original assignee: FOSHAN NANDIAN SWITCH Co Ltd
Current assignee: GUANGDONG NANGUAN ELECTRICAL CO., LTD.
Priority date: 2008-11-24
Filing date: 2008-11-24
Publication date: 2009-09-30
Anticipated expiration: 2018-11-24

Abstract

The utility model relates to a low voltage circuit breaker which comprises a circuit breaker body. A releasing device is arranged in the circuit breaker body; the circuit breaker also comprises a high-voltage phase lack protection control module which comprises a low-voltage power supply module, a sampling module, an analytical comparison module and an output execution module, wherein the low-voltage power supply module is connected on a phase line of a secondary edge of a transformer; the sampling module is used for sampling the voltage parameters of the secondary edge of the transformer; the output end of the sampling module is connected with the analytical comparison module; the output end of the analytical comparison module is connected with the output execution module; and the output execution module is connected with the low-voltage power supply module. When data sampled by the sampling module are judged into normal data, a releasing coil of the output execution module does not work, so the releasing device does not work. When the samples of the sampling module are in a phase lack state, the analytical comparison module controls the action of the releasing device through the releasing coil of the output execution module, the circuit breaker is in an open state, the circuit is switched off, and the original edge phase lack protection of the transformer is realized.

Description

Low-voltage circuit breaker

Technical field

The utility model relates to a kind of low-voltage circuit breaker, particularly a kind of low-voltage circuit breaker with high voltage open-phase protection.

Background technology

Existing low-voltage circuit breaker can only carry out the secondary protection to secondary (low-pressure side) phase shortage; phase shortage appears when the former limit of transformer (high-pressure side) occurring; it is excessive and cause being connected the situation that burning appears in the electrical equipment on the secondary voltage then can to occur, and it is unreliable to use, and security incident takes place easily.

Summary of the invention

In order to solve the above problems, the purpose of this utility model is to provide a kind of low-voltage circuit breaker reliable, that can protect the high pressure phase shortage that uses.

The technical scheme that the invention for solving the technical problem adopted is:

Low-voltage circuit breaker; comprise breaker body; release is installed in the breaker body; low-voltage circuit breaker also comprises high voltage open-phase protection control module; this control module includes the low-tension supply module that connects on the transformer secondary phase line; gather the sampling module of transformer secondary voltage parameter; analyze comparison module and output Executive Module; the output of sampling module is connected to the analysis comparison module; the output of analyzing comparison module connects the output Executive Module; the output Executive Module is connected with the low-tension supply module, and the output Executive Module is by the work of tripping coil control release.

The beneficial effects of the utility model are: no matter former which kind of connection of secondary winding of transformer, the low-pressure side voltage of corresponding former limit phase shortage all can reduce, and decline by a big margin, during the work of this circuit breaker, the data of sampling when sampling module comparison module by analysis are judged as just often, the tripping coil of output Executive Module is not worked, thereby release is failure to actuate; When sampling module is sampled as phase shortage; analyze the tripping coil control release action of comparison module by the output Executive Module; circuit breaker trip; cut off circuit; avoid burning the load that is connected on the step down side; realize the former limit of transformer open-phase protection, promptly to the low-voltage circuit breaker execute protection of the former limit of transformer high pressure phase shortage by secondary.

Description of drawings

The utility model is described in further detail below in conjunction with drawings and Examples.

Fig. 1 is the structural representation that the former secondary winding of transformer adopts Δ/Yn connection;

Fig. 2 is the structural representation that the former secondary winding of transformer adopts the Y/Yn connection;

Fig. 3 is an overall structure block diagram of the present utility model;

Fig. 4 is a concrete structure schematic diagram of the present utility model.

Embodiment

This device is at the low-voltage circuit breaker execute protection of the former limit of transformer high pressure phase shortage by secondary, and its mechanism is as follows:

(1) to Δ/Yn connection: promptly working as the former limit of transformer winding (high pressure) is the triangle connection, and secondary winding (low pressure) is (as Fig. 1) when measuring shape (neutral earthing) connection,

When former limit B phase phase shortage (or A, C mutually all with), voltage U then _AB=U _BC=1/2U _ACSecondary is in two kinds of situation at this moment:

Unloaded or the charged resistive load of i

Uab＝Ubc≤1/2Uac

The charged engine loads of ii

Uab＝Ubc＜1/2Uac

(2) to the Y/Yn connection, promptly when the former limit of transformer winding (high pressure) be isolated neutral amount shape connection, when secondary winding (low pressure) is the amount shape connection of neutral ground (as Fig. 2).

When former limit B phase phase shortage (or A, C all with) voltage U then _BO=0

At this moment, secondary is also in two kinds of situation:

Unloaded or the charged resistive load of i

Phase voltage Ubo=0

The charged engine loads of ii, when motor is running well,

o＜Ubo＜U _AO＝Uco

To sum up analyze, no matter former which kind of connection of secondary winding of transformer, the low-pressure side voltage of corresponding former limit phase shortage all can reduce, and declines by a big margin, and obtains this Design of device principle in view of the above.

According to above-mentioned principle; with reference to Fig. 3; 4; low-voltage circuit breaker of the present utility model; comprise breaker body 1; release 2 is installed in the breaker body; low-voltage circuit breaker also comprises high voltage open-phase protection control module 3; this control module 3 includes the low-tension supply module I that connects on the transformer secondary phase line; gather the sampling module II of transformer secondary voltage parameter; analyze comparison module III and output Executive Module IV; the output of sampling module II is connected to analyzes comparison module III; the output of analyzing comparison module III connects output Executive Module IV; output Executive Module IV is connected with the low-tension supply module I, and output Executive Module IV is by the work of tripping coil T control release 2.

Wherein, the low-tension supply module I connects on the transformer secondary phase line, the end of the sampling module II of described collection transformer secondary voltage parameter is connected with transformer secondary phase line, the other end connects analyzes comparison module III, it is made up of three groups of sampling modules, each sampling module is by a diode D4, D5, D6 and a resistance R 2, R3, the R4 series connection, diode D4, D5, the cathode connecting transformer secondary phase line of D6, resistance R 2, R3, the other end of R4 connects analyzes comparison module III, and in this resistance R 2, R3, the output of R4 is by another resistance R 5, R6, R7 ground connection, three output lines of sampling module II are analyzed comparison module III to connecting, this analysis comparison module III includes microprocessor CPU, this microprocessor CPU is preferably the single-chip microcomputer of 80C196KC model, the output of this analysis comparison module III is connected to output Executive Module IV, and output Executive Module IV mainly comprises tripping coil T and thyristor SCR.

The data of being sampled as sampling module II comparison module III by analysis are judged as just often, and the K point among the output Executive Module IV is a low level, and thyristor SCR ends at this moment, not conducting, and tripping coil T does not work, thus the release corresponding with tripping coil is failure to actuate; When sampling module II was sampled as phase shortage, the K point was a high level, thyristor SCR triggering and conducting, and tripping coil T work, release 2 actions corresponding with tripping coil T, circuit breaker trip cuts off circuit, reaches the purpose of the former limit of transformer (high pressure) open-phase protection.

In addition, in the technology of the invention, also include other existing control circuit, realize various prior function.

Certainly, the invention is not limited to above-mentioned execution mode, as long as it reaches technique effect of the present utility model with essentially identical means, all should belong to protection range of the present utility model.

Claims

1; low-voltage circuit breaker; comprise breaker body (1); release (2) is installed in the breaker body; it is characterized in that: low-voltage circuit breaker also comprises high voltage open-phase protection control module (3); this control module (3) includes the low-tension supply module (I) that connects on the transformer secondary phase line; gather the sampling module (II) of transformer secondary voltage parameter; analyze comparison module (III) and output Executive Module (IV); the output of sampling module (II) is connected to analyzes comparison module (III); the output of analyzing comparison module (III) connects output Executive Module (IV); output Executive Module (IV) is connected with low-tension supply module (I), and output Executive Module (IV) is by the work of tripping coil (T) control release (2).

2, low-voltage circuit breaker according to claim 1, it is characterized in that: an end of the sampling module (II) of described collection transformer secondary voltage parameter is connected with transformer secondary phase line, the other end connects analyzes comparison module (III), it is made up of three groups of sampling modules, each sampling module is by a diode and a resistance series connection, the cathode connecting transformer secondary phase line of diode, the other end of resistance connects analyzes comparison module (III), and passes through another grounding through resistance at the output of this resistance.

3, low-voltage circuit breaker according to claim 1 is characterized in that: described analysis comparison module (III) includes microprocessor, and the microprocessor model is 80C196KC.