CN201845038U - Electrical leakage tester for three-phase three-wire IT (information technology) system - Google Patents

Electrical leakage tester for three-phase three-wire IT (information technology) system Download PDF

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Publication number
CN201845038U
CN201845038U CN2009203523176U CN200920352317U CN201845038U CN 201845038 U CN201845038 U CN 201845038U CN 2009203523176 U CN2009203523176 U CN 2009203523176U CN 200920352317 U CN200920352317 U CN 200920352317U CN 201845038 U CN201845038 U CN 201845038U
Authority
CN
China
Prior art keywords
phase
electric leakage
wire
tester
grounded
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN2009203523176U
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Chinese (zh)
Inventor
张燕杰
董卫国
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BEIJING HAIPPO ZHIHENG ELECTRICAL FIRE-PROOF TECHNOLOGY Co Ltd
Original Assignee
BEIJING HAIPPO ZHIHENG ELECTRICAL FIRE-PROOF TECHNOLOGY Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by BEIJING HAIPPO ZHIHENG ELECTRICAL FIRE-PROOF TECHNOLOGY Co Ltd filed Critical BEIJING HAIPPO ZHIHENG ELECTRICAL FIRE-PROOF TECHNOLOGY Co Ltd
Priority to CN2009203523176U priority Critical patent/CN201845038U/en
Application granted granted Critical
Publication of CN201845038U publication Critical patent/CN201845038U/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

The utility model discloses an electrical leakage tester for a three-phase three-wire IT (information technology) system and aims at solving the problem that the three-phase three-wire IT system can not alarm currently when the grounded short circuit occurs to a live wire. As the three-phase three-wire IT system has the characteristics that the three phases are neutral points which are not earthed, the electric leakage can not be generated and the monitoring can not be carried out when the grounded fault of the live wire occurs. The electrical leakage tester adopts a method that three phase neutral points are opened again at a power supply end after being grounded instantaneously for a short time, so that the conventional electric leakage test can be carried out at the test point; therefore, whether the electric leakage exists between the live wire and the ground can be discovered, and the difficulty of carrying out the electric leakage test of three-phase three-wire IT system can be solved. The working principle of the electric leakage tester is as follows: as the three-phase three-wire system does not have grounding points, the electric leakage can not be tested by the conventional electric leakage tester when the grounded short circuit of a certain live wire occurs; as long as the neutral points of a three-phase induction connected with a three-phase live wire are grounded, the electric leakage measurement can be implemented like a common three-phase four-wire system circuit. The working process of the tester is as follows: three live wires penetrate through an iron core of an electric leakage mutual inductor 4; if no electric leakage exists, a normally open contact 2 of a relay is switched on during measurement; if no electric leakage exists, no current is generated on the live wires, no current can be induced on a coil of the mutual inductor 4, and the electric leakage detector 5 can not alarm; if the electric leakage exists, the normally open contact 2 of the.

Description

Three-phase three-wire system I T system electrical leakage tester
Technical field:
Three-phase three-wire system I T system electrical leakage tester belongs to the electric fireproof safety monitoring technology in the low-voltage electric system.Its objective is the current problem of reporting to the police when leaking electricity thereby can't exceed standard of behind three-phase three-wire system I T system generation live wire shorted to earth, can't measuring that solves to electric leakage.
Background technology:
Through repeatedly in internet and patented technology index, retrieving, up to the present, the method of in three-phase three-wire system IT electric system, also electric leakage effectively not being monitored, at present institute often uses, and still to be insulation tester detect the insulation situation of equipment, because insulation tester can't detect all consumers and circuit, so the utility model problem to the comprehensive monitoring leak current fault in three-phase three-wire system I T system provides brand-new solution.
Summary of the invention:
Because the characteristics of three-phase three-wire system I T system are the three-phase isolated neutrals, so when live wire generation earth fault, can not produce electric leakage, therefore can't carry out leakage current detect, the utility model is solved at this problem exactly.Be characterized in utilizing and insert a three pole reactor at the electric power system input end, and make the three-phase neutral point through controlled relay normally open contact short time intermittent earth, when neutral ground, carry out conventional leakage tests, if between live wire and the ground short circuit is arranged, just can monitor the electric leakage size between live wire and the ground, in order not destroy original three-phase three-wire system I T system, the neutral point of three pole reactor is ground connection in short-term.
Description of drawings:
Fig. 1 is the synoptic diagram that electrical leakage tester is installed in the three-phase three-wire system distribution system, in the frame of broken lines is three-phase three-wire system I T system electrical leakage tester circuit, it is characterized by several parts such as relay normally open contact 2, the stake resistance 3 of a three pole reactor 1, earth detector 5 inside and the mutual inductor 4 that leaks electricity, earth detector 5, additional ground wire 6 and forms.
Embodiment:
When carrying out leakage tests, the three pole reactor upper end links to each other with the live wire of three-phase supply, earth detector 5 its inner relay normally open contact 2 closures of control, the neutral ground moment and then the disconnection of three pole reactor 1, so constantly repetitive cycling is carried out, pass through stake resistance 3 ground connection in the three pole reactor lower end, the test that moment leaks electricity, if earth detector 5 will send sound and light alarm when electric leakage past due alarm value was arranged, prompting the related personnel handle, and avoids the generation of possible electrical fire.For preventing that producing big electric current when the neutral ground of inductance damages three pole reactor 1 or relay normally open contact 2, at the stake resistance 3 of a restriction of the neutral point series connection electric current of three pole reactor, its resistance can be calculated as follows:
R=U/I
Wherein U is that live wire voltage over the ground is called phase voltage in the three-phase circuit, is generally 220V in China, and electric current I generally is limited in the 1000mA, so the value of R should be 220 Ω, because be to connect moment, the power of resistance selects 10W enough.

Claims (3)

1. a three-phase three-wire system I T system electrical leakage tester is characterized in that being made up of three pole reactor (1), relay normally open contact (2) stake resistance (3), electric leakage mutual inductor (4), earth detector (5), additional ground wire (6) etc.
2. three-phase three-wire system I T according to claim 1 system electrical leakage tester is characterized in that the upper end of three pole reactor (1) will join with three-phase firewire.
3. a kind of three-phase three-wire system I T according to claim 1 system electrical leakage tester is characterized in that by relay (2), stake resistance (3) lower end of three pole reactor (1) and additional ground wire (6) being joined.
CN2009203523176U 2009-12-23 2009-12-23 Electrical leakage tester for three-phase three-wire IT (information technology) system Expired - Fee Related CN201845038U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2009203523176U CN201845038U (en) 2009-12-23 2009-12-23 Electrical leakage tester for three-phase three-wire IT (information technology) system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2009203523176U CN201845038U (en) 2009-12-23 2009-12-23 Electrical leakage tester for three-phase three-wire IT (information technology) system

Publications (1)

Publication Number Publication Date
CN201845038U true CN201845038U (en) 2011-05-25

Family

ID=44039925

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2009203523176U Expired - Fee Related CN201845038U (en) 2009-12-23 2009-12-23 Electrical leakage tester for three-phase three-wire IT (information technology) system

Country Status (1)

Country Link
CN (1) CN201845038U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103852643A (en) * 2012-12-04 2014-06-11 本德尔有限两合公司 Insulation monitoring device with measuring circuit interruption
CN104837586A (en) * 2012-09-28 2015-08-12 罗伯特·博世工具公司 System and method for identification of contact between an object and a static implement in a power tool

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104837586A (en) * 2012-09-28 2015-08-12 罗伯特·博世工具公司 System and method for identification of contact between an object and a static implement in a power tool
CN103852643A (en) * 2012-12-04 2014-06-11 本德尔有限两合公司 Insulation monitoring device with measuring circuit interruption

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C14 Grant of patent or utility model
GR01 Patent grant
C17 Cessation of patent right
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20110525

Termination date: 20121223