IEEE C62.33 1982

$40.08

IEEE Standard Test Specifications for Varistor Surge-Protective Devices

Published By	Publication Date	Number of Pages
IEEE	1982	21

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Description

New IEEE Standard – Active. Varistors for surge-protective applications on systems with dc to 420 Hz frequency and voltages equal to or less than 1000 V rms, or 1200 V dc, are covered. Definitions, service conditions, and a series of test criteria for determining the electrical characteristics of the varistors are provided. The tests are intended as design tests and provide a means of comparing various surge-protective devices.

PDF Catalog

PDF Pages	PDF Title
1	Title page
2	Introduction Participants
5	CONTENTS
7	1. Scope
8	2. A Description of Terms and Letter Symbols Used in Defining Varistors 2.1 Rated Parameter Values 2.2 Descriptions
9	2.3 Basic Descriptions
11	3. Service Conditions 3.1 Normal Service Conditions
12	3.2 Unusual Service Conditions
13	4. Standard Design Test Procedure 4.1 Standard Design Test Criteria 4.2 Statistical Procedures 4.3 Test Conditions 4.4 Clamping Voltage Test (Vc) (See Fig 3)
14	4.5 Rated Peak Single Pulse Transient Current Test (Itm) (See Fig 4) 4.6 Lifetime Rated Pulse Currents Tests (See Fig 3)
16	4.7 Rated RMS Voltage Test [Vm(ac)] (See Fig 5), Rated DC Voltage Tests [Vm(dc)] (See Fig 5) 4.8 DC Standby Current Test (ID) (See Fig 6) 4.9 Nominal Varistor Voltage Test [VN(dc) and VN(ac)] (See Fig 6)
17	4.10 Rated Recurrent Peak Voltage Test (Vpm) (See Fig 5)
18	4.11 Capacitance Test 4.12 AC Standby Power (Pd) (See Fig 7) 5. Failure Modes 5.1 Short-Circuit Failure Mode 5.2 Degradation Failure Mode
19	5.3 High Clamping Voltage Failure Mode 5.4 “Fail-Safe” Operation 6. Other Parameters 6.1 Rated Transient Energy
20	6.2 Rated Transient Average Power Dissipation [Pt(A V)m] 6.3 Voltage Overshoot (Vos) (See Fig 8)
21	6.4 Response Time, Overshoot Duration (See Fig 8) 7. Bibliography